/* ─── Chatstack — Global Design System ───────────────────────────────────────
   Philosophy: whitespace and typography do all the visual work.
   Palette is almost monochrome. No decorative UI.
   ─────────────────────────────────────────────────────────────────────────── */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Lora:ital,wght@0,400;0,600;1,400&family=JetBrains+Mono:wght@400;500&family=Merriweather:ital,wght@0,400;0,700;1,400&family=Open+Sans:wght@400;700&family=Roboto:wght@400;700&family=Lato:wght@400;700&family=Montserrat:wght@600;700&family=Playfair+Display:ital,wght@0,600;0,700;1,600&display=swap');

/* ─── Tokens ──────────────────────────────────────────────────────────────── */

:root {
  --bg: #F9F7F4;
  /* Warm off-white — reduces eye strain vs cold white */
  --text: #18181B;
  /* Deep charcoal for headings */
  --text-2: #3A3A3A;
  /* Softened dark — easier on eyes during long reading */
  --text-3: #5A5A65;
  --border: #e8e8e8;
  --border-light: #f2f2f2;
  --code-bg: #f6f6f6;
  --accent: #18181B;
  --link: #18181B;

  --quote-bg: #faf5ff;
  --quote-text: #6d28d9;
  --quote-border: #c084fc;
  --share-cta-bg: linear-gradient(to bottom, #faf5ff, #ffffff);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Lora', Georgia, 'Times New Roman', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --current-font: var(--font-sans);
  --current-heading-font: var(--font-sans);

  --content-width: 680px;
  --wide-width: 980px;

  --radius: 4px;
  --radius-sm: 2px;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;

  /* Redesign custom properties (theme-aware) */
  --bg-redesign: var(--bg);
  --surface-1: var(--code-bg, #f6f8fa);
  --surface: var(--surface-1, var(--code-bg, #f6f8fa));
  --surface-2: var(--code-bg, #f2f2f2);
  --border-redesign: var(--border);
  --text-1: var(--text);
  --text-2-redesign: var(--text-2);
  --text-3-redesign: var(--text-3);
  --accent-redesign: var(--accent);
  --accent-soft: var(--surface-1, #f6f8fa);

  /* Type scale */
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono-redesign: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing scale (8px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  /* Radii */
  --r-sm: 4px;
  /* inputs */
  --r-md: 6px;
  /* buttons */
  --r-lg: 8px;
  /* code/cards */
  --r-xl: 12px;
  /* images */
}

/* ─── Themes ──────────────────────────────────────────────────────────────── */

html[data-theme="white"] {
  --bg: #F9F7F4;
  /* Warm off-white — easier on eyes than cold white */
  --text: #18181B;
  --text-2: #3A3A3A;
  /* Softened — reduces contrast fatigue in long reads */
  --text-3: #5A5A65;
  --border: #e8e8e8;
  --border-light: #f2f2f2;
  --code-bg: #f6f6f6;
  --surface-1: #f6f8fa;
  --accent: #18181B;
  --link: #18181B;
  --msg-user-bg: #f3f8ff;
  --msg-user-border: #e0f2fe;
  --msg-user-accent: #3b82f6;
  --msg-assistant-bg: #f0fdf4;
  --msg-assistant-border: #dcfce7;
  --msg-assistant-accent: #16a34a;
}

html[data-theme="creamy"] {
  --bg: #F9F6F0;
  /* rich warm paper cream */
  --text: #18181B;
  /* deep light-black / charcoal for maximum contrast */
  --text-2: #27272A;
  /* high-contrast dark */
  --text-3: #52525B;
  /* clear medium */
  --border: #E2DAD0;
  /* defined crisp warm border */
  --border-light: #EBE4DA;
  --code-bg: #F2EDE4;
  /* rich distinct cream surface */
  --surface-1: #F2EDE4;
  --surface-2: #EAE3D7;
  --accent: #1A1815;
  --link: #1A1815;
  --msg-user-bg: #F2EDE4;
  --msg-user-border: #E2DAD0;
  --msg-user-accent: #1A1815;
  --msg-assistant-bg: #F9F6F0;
  --msg-assistant-border: #EBE4DA;
  --msg-assistant-accent: #1A1815;
  --quote-bg: #F2EDE4;
  --quote-text: #1A1815;
  --quote-border: #E2DAD0;
  --share-cta-bg: linear-gradient(to bottom, #F2EDE4, #F9F6F0);
}

html[data-theme="dark"] {
  --bg: #0f0f0f;
  --text: #f5f5f5;
  --text-2: #d4d4d4;
  --text-3: #a3a3a3;
  --border: #262626;
  --border-light: #1c1c1c;
  --code-bg: #171717;
  --surface-1: #1f1f1f;
  --accent: #f5f5f5;
  --link: #f5f5f5;
  --msg-user-bg: #0d172a;
  --msg-user-border: #1e293b;
  --msg-user-accent: #3b82f6;
  --msg-assistant-bg: #062e24;
  --msg-assistant-border: #0f533a;
  --msg-assistant-accent: #10b981;
  --quote-bg: #1a1226;
  --quote-text: #d8b4fe;
  --quote-border: #a855f7;
  --share-cta-bg: linear-gradient(to bottom, #1e1b4b, #0f0f0f);
}

html[data-theme="sage"] {
  --bg: #f1f3f1;
  --text: #1c251f;
  --text-2: #4c5850;
  --text-3: #8a958e;
  --border: #dcdfdc;
  --border-light: #e6e9e6;
  --code-bg: #e6e9e6;
  --surface-1: #e0e4e0;
  --accent: #2c3d31;
  --link: #2c3d31;
  --msg-user-bg: #f0f6ff;
  --msg-user-border: #cbd5e1;
  --msg-user-accent: #3b82f6;
  --msg-assistant-bg: #f3faf6;
  --msg-assistant-border: #cbd5e1;
  --msg-assistant-accent: #10b981;
  --quote-bg: #f3f0f7;
  --quote-text: #581c87;
  --quote-border: #a855f7;
  --share-cta-bg: linear-gradient(to bottom, #f3f0f7, #f1f3f1);
}

html[data-theme="sand"] {
  --bg: #fdf6e3;
  --text: #002b36;
  --text-2: #586e75;
  --text-3: #93a1a1;
  --border: #eee8d5;
  --border-light: #f5f0eb;
  --code-bg: #eef1e6;
  --surface-1: #eef1e6;
  --accent: #b58900;
  --link: #b58900;
  --msg-user-bg: #ebf4f5;
  --msg-user-border: #eee8d5;
  --msg-user-accent: #2aa198;
  --msg-assistant-bg: #f5f6e8;
  --msg-assistant-border: #eee8d5;
  --msg-assistant-accent: #859900;
  --quote-bg: #eee8d5;
  --quote-text: #b58900;
  --quote-border: #cb4b16;
  --share-cta-bg: linear-gradient(to bottom, #eee8d5, #fdf6e3);
}

html[data-theme="midnight"] {
  --bg: #070913;
  --text: #e2e8f0;
  --text-2: #94a3b8;
  --text-3: #475569;
  --border: #1e293b;
  --border-light: #0f172a;
  --code-bg: #0f172a;
  --surface-1: #1e293b;
  --accent: #3b82f6;
  --link: #3b82f6;
  --msg-user-bg: #0d1b3e;
  --msg-user-border: #1e293b;
  --msg-user-accent: #3b82f6;
  --msg-assistant-bg: #062c21;
  --msg-assistant-border: #1e293b;
  --msg-assistant-accent: #10b981;
  --quote-bg: #131130;
  --quote-text: #a5b4fc;
  --quote-border: #6366f1;
  --share-cta-bg: linear-gradient(to bottom, #0f172a, #070913);
}

html[data-theme="neon-pink"] {
  --bg: #0a010a;
  --text: #f8f8f2;
  --text-2: #ff79c6;
  --text-3: #bd93f9;
  --border: #4a0e4a;
  --border-light: #2d042d;
  --code-bg: #200320;
  --surface-1: #2d042d;
  --accent: #ff79c6;
  --link: #ff79c6;
  --msg-user-bg: #200320;
  --msg-user-border: #4a0e4a;
  --msg-user-accent: #ff79c6;
  --msg-assistant-bg: #100120;
  --msg-assistant-border: #4a0e4a;
  --msg-assistant-accent: #bd93f9;
  --quote-bg: #2d042d;
  --quote-text: #ff79c6;
  --quote-border: #ff79c6;
  --share-cta-bg: #1a011a;
}

html[data-theme="cyber-green"] {
  --bg: #020802;
  --text: #d0ffd0;
  --text-2: #39ff14;
  --text-3: #008f11;
  --border: #154c15;
  --border-light: #0b260b;
  --code-bg: #0b260b;
  --surface-1: #0c330c;
  --accent: #39ff14;
  --link: #39ff14;
  --msg-user-bg: #020f02;
  --msg-user-border: #154c15;
  --msg-user-accent: #39ff14;
  --msg-assistant-bg: #020f02;
  --msg-assistant-border: #154c15;
  --msg-assistant-accent: #50fa7b;
  --quote-bg: #0c330c;
  --quote-text: #39ff14;
  --quote-border: #39ff14;
  --share-cta-bg: #020a02;
}

html[data-theme="lavender"] {
  --bg: #1b1822;
  --text: #f3e8ff;
  --text-2: #d8b4fe;
  --text-3: #a855f7;
  --border: #3b2f4c;
  --border-light: #271d33;
  --code-bg: #271d33;
  --surface-1: #2f243d;
  --accent: #e9d5ff;
  --link: #e9d5ff;
  --msg-user-bg: #231c30;
  --msg-user-border: #3b2f4c;
  --msg-user-accent: #d8b4fe;
  --msg-assistant-bg: #1a162b;
  --msg-assistant-border: #3b2f4c;
  --msg-assistant-accent: #a855f7;
  --quote-bg: #2f243d;
  --quote-text: #d8b4fe;
  --quote-border: #a855f7;
  --share-cta-bg: #1e1826;
}

/* ─── Funky Animated Themes ─── */

@keyframes gradientBG {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

@keyframes neonPulsePink {
  from {
    text-shadow: 0 0 4px rgba(255, 121, 198, 0.4), 0 0 10px rgba(255, 121, 198, 0.1);
  }

  to {
    text-shadow: 0 0 12px rgba(255, 121, 198, 0.7), 0 0 25px rgba(255, 121, 198, 0.3);
  }
}

@keyframes neonPulseGreen {
  from {
    text-shadow: 0 0 4px rgba(52, 211, 153, 0.4), 0 0 10px rgba(52, 211, 153, 0.1);
  }

  to {
    text-shadow: 0 0 12px rgba(52, 211, 153, 0.7), 0 0 25px rgba(52, 211, 153, 0.3);
  }
}

html[data-theme="synthwave"] {
  --bg: #140320;
  --text: #f8f8f2;
  --text-2: #ff79c6;
  --text-3: #bd93f9;
  --border: #4d125a;
  --border-light: #2c0836;
  --code-bg: #200427;
  --surface-1: #2d0738;
  --accent: #ff79c6;
  --link: #ff79c6;
  --msg-user-bg: #200327;
  --msg-user-border: #4d125a;
  --msg-user-accent: #ff79c6;
  --msg-assistant-bg: #130325;
  --msg-assistant-border: #4d125a;
  --msg-assistant-accent: #bd93f9;
  --quote-bg: #2d0738;
  --quote-text: #ff79c6;
  --quote-border: #ff79c6;
  --share-cta-bg: #1a0329;
}

html[data-theme="synthwave"] body {
  background: linear-gradient(-45deg, #190527, #0b0214, #2c0b3f, #090111) !important;
  background-size: 400% 400% !important;
  animation: gradientBG 12s ease infinite !important;
}

html[data-theme="synthwave"] h1,
html[data-theme="synthwave"] .site-header__logo,
html[data-theme="synthwave"] .blog-page__name {
  animation: neonPulsePink 2s infinite alternate !important;
}

html[data-theme="aurora"] {
  --bg: #071011;
  --text: #d1fae5;
  --text-2: #34d399;
  --text-3: #60a5fa;
  --border: #112929;
  --border-light: #0d1e21;
  --code-bg: #0b1619;
  --surface-1: #0f2226;
  --accent: #34d399;
  --link: #34d399;
  --msg-user-bg: #081628;
  --msg-user-border: #112929;
  --msg-user-accent: #60a5fa;
  --msg-assistant-bg: #061a1a;
  --msg-assistant-border: #112929;
  --msg-assistant-accent: #34d399;
  --quote-bg: #0f2226;
  --quote-text: #34d399;
  --quote-border: #34d399;
  --share-cta-bg: #071516;
}

html[data-theme="aurora"] body {
  background: linear-gradient(-45deg, #071311, #0b0b14, #051622, #0d141b) !important;
  background-size: 400% 400% !important;
  animation: gradientBG 16s ease infinite !important;
}

html[data-theme="aurora"] h1,
html[data-theme="aurora"] .site-header__logo,
html[data-theme="aurora"] .blog-page__name {
  animation: neonPulseGreen 2s infinite alternate !important;
}

/* ─── Reset ───────────────────────────────────────────────────────────────── */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--current-font);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ─── Layout ──────────────────────────────────────────────────────────────── */

.container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--wide {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ─── Typography ──────────────────────────────────────────────────────────── */

h1,
h2,
h3,
h4 {
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 1.75rem;
}

h2 {
  font-size: 1.25rem;
}

h3 {
  font-size: 1.05rem;
}

p {
  margin-top: 0;
}

small,
.text-sm {
  font-size: 0.8rem;
}

.text-muted {
  color: var(--text-2);
}

.text-faint {
  color: var(--text-3);
}

.site-header {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-light);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text);
  text-decoration: none;
  font-family: var(--font-sans) !important;
  transition: opacity 0.15s ease;
}

.site-header__logo:hover {
  opacity: 0.85;
}

.site-header__logo-icon {
  display: block;
  width: 24px;
  height: 24px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__left {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.site-header__user-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text, #1A1815);
  transition: opacity 0.15s ease;
}

.site-header__user-link:hover {
  opacity: 0.85;
  text-decoration: none;
}

.site-header__user-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text, #1A1815) !important;
  letter-spacing: -0.01em;
  line-height: 1.2;
  opacity: 1 !important;
}

.site-header__avatar-img {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid var(--border-light, #E2DAD0);
}

.site-header__avatar-fallback {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--code-bg, #F2EDE4);
  color: var(--text, #1A1815);
  font-size: 0.78rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid var(--border-light, #E2DAD0);
}

.post-header__avatar-img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid var(--border-light, #E2DAD0);
}

.site-header__nav {
  display: flex;
  gap: 1.25rem;
  align-items: center;
  font-size: 0.85rem;
}

.site-header__auth-btn {
  background: transparent;
  border: 1px solid var(--border, #E5E7EB);
  border-radius: 9999px;
  padding: 0.35rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-2, #4B5563);
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1.2;
}

.site-header__auth-btn:hover {
  background: var(--surface-1, #F4F4F5);
  border-color: var(--text-3, #9CA3AF);
  color: var(--text, #18181B);
}

.site-header__google-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  background: transparent;
}

.site-header__google-btn iframe {
  mix-blend-mode: multiply !important;
}

/* Dark mode themes blend mode */
html[data-theme="dark"] .site-header__google-btn iframe,
html[data-theme="midnight"] .site-header__google-btn iframe,
html[data-theme="neon-pink"] .site-header__google-btn iframe,
html[data-theme="cyber-green"] .site-header__google-btn iframe,
html[data-theme="synthwave"] .site-header__google-btn iframe,
html[data-theme="aurora"] .site-header__google-btn iframe {
  mix-blend-mode: screen !important;
}

.site-header__nav a {
  color: var(--text-2);
  transition: color 0.15s ease;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

.site-header__nav a:hover {
  color: var(--text);
}

.site-header__nav a.active {
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
}

.site-header__nav a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--text);
  border-radius: 9999px;
}

/* ─── Landing Page ────────────────────────────────────────────────────────── */

.landing {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 80vh;
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
}

.landing__eyebrow {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
  border: 1px solid var(--border);
  padding: 0.2rem 0.65rem;
  border-radius: 9999px;
  margin-bottom: var(--space-md);
  background: var(--surface-1);
}

.landing__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.22;
  margin-bottom: 0.75rem;
}

.landing__sub {
  font-size: 1.05rem;
  color: var(--text);
  max-width: 480px;
  margin: 0 auto 1.5rem auto;
  line-height: 1.7;
}

.landing__actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0 !important;
}

.landing__divider {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 240px;
  gap: 1rem;
  margin: 0.5rem 0;
}

.landing__divider-line {
  flex: 1;
  height: 1px;
  background-color: var(--border);
  opacity: 0.5;
}

.landing__or {
  font-size: 0.8rem;
  color: var(--text-3);
  font-weight: 500;
}

.landing__ext-link {
  font-size: 0.85rem;
  color: var(--text-2);
  border-bottom: 1px solid var(--border);
  padding-bottom: 1px;
}

.landing__ext-link:hover {
  color: var(--text);
  text-decoration: none;
}

/* ─── Buttons ─────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.6rem 1.4rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1;
  border-radius: 9999px;
  /* Pill CTAs */
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover {
  text-decoration: none;
}

.btn--primary {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

.btn--primary:hover {
  opacity: 0.9;
  transform: translateY(-0.5px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.btn--outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn--outline:hover {
  border-color: var(--text-2);
  background: var(--surface-1);
}

.btn--ghost {
  background: transparent;
  color: var(--text-2);
  border-color: transparent;
  padding: 0.5rem 0.75rem;
}

.btn--ghost:hover {
  background: var(--code-bg);
  color: var(--text);
}

.btn--google {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.65rem 1.5rem;
  font-size: 0.88rem;
  font-weight: 500;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
}

.btn--google:hover {
  border-color: var(--text-2);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.btn--google svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn--sm {
  font-size: 0.8rem;
  padding: 0.4rem 0.8rem;
}

.btn--danger:hover {
  color: #c0392b;
  border-color: #c0392b;
}

/* ─── Form Elements ───────────────────────────────────────────────────────── */

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-2);
  letter-spacing: 0.02em;
}

input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.12s;
}

input:focus,
textarea:focus {
  border-color: var(--text);
}

.input-hint {
  font-size: 0.78rem;
  color: var(--text-3);
  margin-top: 2px;
}

.input-hint--ok {
  color: #27ae60;
}

.input-hint--err {
  color: #c0392b;
}

/* ─── Onboarding ──────────────────────────────────────────────────────────── */

.onboarding {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--space-lg);
}

.onboarding__card {
  width: 100%;
  max-width: 440px;
}

.onboarding__title {
  font-size: 1.4rem;
  margin-bottom: var(--space-xs);
}

.onboarding__sub {
  font-size: 0.9rem;
  color: var(--text-2);
  margin-bottom: var(--space-xl);
}

.username-preview {
  font-size: 0.82rem;
  color: var(--text-3);
  margin-top: var(--space-xs);
}

.username-preview strong {
  color: var(--text-2);
  font-weight: 500;
}

/* ─── Dashboard ───────────────────────────────────────────────────────────── */

.dashboard {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-2xl);
}

.dashboard__header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border-light);
}

.dashboard__blog-link {
  font-size: 0.85rem;
  color: var(--text-2);
  display: inline-block;
  margin-top: var(--space-xs);
}

.dashboard__blog-link:hover {
  color: var(--text);
  text-decoration: none;
}

.posts-list {
  list-style: none;
}

.post-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-lg);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border-light);
}

.post-item:last-child {
  border-bottom: none;
}

.post-item__info {
  flex: 1;
  min-width: 0;
}

.post-item__title {
  font-size: 0.95rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 2px;
}

.post-item__title a {
  color: var(--text);
}

.post-item__title a:hover {
  text-decoration: none;
}

.post-item__meta {
  font-size: 0.78rem;
  color: var(--text-3);
}

.post-item__actions {
  display: flex;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.dashboard__empty {
  padding: var(--space-xl) 0;
  color: var(--text-2);
  font-size: 0.9rem;
}

/* ─── Blog Homepage ───────────────────────────────────────────────────────── */

.blog-page {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-2xl);
}

.blog-page__header {
  margin-bottom: var(--space-xl);
}

.blog-page__name {
  font-size: 1.1rem;
  font-weight: 600;
}

.blog-page__bio {
  font-size: 0.9rem;
  color: var(--text-2);
  margin-top: var(--space-xs);
}

.blog-page__divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-xl) 0;
}

.blog-posts {
  list-style: none;
}

.blog-post-item {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border-light);
}

.blog-post-item:last-child {
  border-bottom: none;
}

.blog-post-item__title {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.blog-post-item__title a {
  color: var(--text);
}

.blog-post-item__title a:hover {
  text-decoration: none;
}

.blog-post-item__date {
  font-size: 0.8rem;
  color: var(--text-3);
}

/* ─── Post / Conversation Page ────────────────────────────────────────────── */

.post-page {
  padding-top: 3rem;
  padding-bottom: 6rem;
  max-width: 720px;
  margin: 0 auto;
  padding-left: 2rem;
  padding-right: 2rem;
}

.post-page__back {
  font-size: 0.82rem;
  color: var(--text-3);
  margin-bottom: var(--space-xl);
  display: inline-block;
}

.post-page__back:hover {
  color: var(--text-2);
  text-decoration: none;
}

.post-header {
  border: none;
  background: none;
  border-radius: 0;
  padding: 0;
  margin-bottom: 0;
  box-shadow: none;
}

.post-header__title {
  font-family: var(--font-sans);
  font-size: 2.2rem;
  font-weight: 600;
  /* softened from 700 — less blunt on warm cream */
  letter-spacing: -0.025em;
  /* slightly tighter but not harsh */
  line-height: 1.15;
  margin-bottom: 0;
  color: var(--text);
}

.post-header__divider {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: 1rem 0;
  opacity: 0.8;
}

.post-header__meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.post-header__meta-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: 0.85rem;
  color: var(--text-2);
}

.post-header__controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Control Buttons styling */
.btn-toggle-all {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.4rem 0.8rem;
  color: var(--text-2);
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.btn-toggle-all:hover {
  background: var(--border-light);
  color: var(--text);
}

.btn-share {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: #3b82f6;
  /* Beautiful responsive blue */
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  padding: 0.4rem 0.8rem;
  transition: color 0.15s, opacity 0.15s;
}

.btn-share:hover {
  opacity: 0.8;
}

.post-header__meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.post-header__meta-item svg {
  color: var(--text-3);
  opacity: 0.8;
  stroke-width: 2;
  /* optical match */
  flex-shrink: 0;
}

.toggle-all-icon {
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  flex-shrink: 0;
}

.post-divider {
  display: none;
  /* hidden since we now use the post-header card divider */
}

/* ─── Conversation Renderer ───────────────────────────────────────────────── */

:root {
  /* Conversation-specific tokens */
  --user-bg: #f3f4f6;
  /* very minimal light cool gray */
  --user-border: #e5e7eb;
  --asst-bg: #fafafa;
  /* very minimal clean white/gray card */
  --asst-border: #e5e5e5;
  --asst-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);

  --surface-1: #f6f8fa;
  --code-bg: #f6f8fa;
  --code-border: #e1e4e8;
  --code-header-bg: #f0f2f4;

  --quote-border: #c084fc;
  /* purple accent for quotes */
  --math-bg: #faf9ff;
  --math-border: #d8b4fe;
}

.conversation {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 24px;
}




/* ── Label — inline bold prefix ── */
.message__label {
  display: inline;
  font-size: 1rem;
  font-weight: 600;
  margin-right: 0.5rem;
  position: relative;
}

.message--user .message__label {
  font-family: var(--font-sans);
  color: var(--text-2);
  margin-right: 0;
}

.message--assistant .message__label {
  font-family: var(--font-serif);
  color: var(--text-2);
}

.message__role-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
  font-family: var(--font-sans);
}

/* ── Message body ── */
.message__body {
  display: inline;
  font-family: var(--current-font);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
}

/* For multi-paragraph bodies, wrap in block after the first line */
.message__body p,
.message__body h1,
.message__body h2,
.message__body h3,
.message__body h4,
.message__body h5,
.message__body h6,
.message__body ul,
.message__body ol,
.message__body .code-block,
.message__body .quote-block,
.message__body .math-block,
.message__body .image-block,
.message__body table {
  display: block;
}

.message__body p:first-child {
  display: inline;
}


.message--user .message__body {
  background: none;
  border: none;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--text);
  font-weight: 600;
}

.message--assistant .message__body {
  background: none;
  border: none;
  box-shadow: none;
}

/* ── Message: turn divider + container ── */
.message {
  display: block;
  margin-bottom: 0;
  padding: 0.5rem 0 0.5rem 22px;
  width: 100%;
  position: relative;
  box-sizing: border-box;
}

.message--user {
  padding-top: 1rem;
  padding-bottom: 0.5rem;
}

.message--assistant {
  padding-top: 0.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  /* warm hairline, ~#E5E0D5 in creamy */
}

.message:last-child {
  border-bottom: none;
}

/* ── Collapsible label wrapper ── */
.message__label--collapsible {
  display: inline;
  cursor: pointer;
  user-select: none;
}

.message__label--collapsible:focus-visible {
  outline: 2px solid var(--accent);
  border-radius: 2px;
}

/* ── Toggle chevron — vertically centred with label baseline ── */
.message__toggle-btn {
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
  position: absolute;
  left: -22px;
  top: 0.15rem;
  /* aligns with label text line */
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px;
  color: var(--text-3);
  width: 16px;
  height: 16px;
  border-radius: 3px;
  transition: color 0.15s, background 0.15s;
  flex-shrink: 0;
}

.message__toggle-btn:hover {
  color: var(--text-2);
  background: var(--surface-1);
}

/* Chevron icon rotation */
.message__toggle-icon {
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  transform-origin: center;
  display: block;
  flex-shrink: 0;
}

.message--collapsed .message__toggle-icon {
  transform: rotate(0deg);
  /* points right → */
}

.message--expanded .message__toggle-icon {
  transform: rotate(90deg);
  /* points down ↓ */
}

/* ── Message: collapsed = show 1 line, expanded = full ── */
.message--collapsible {
  transition: opacity 0.2s ease;
}

.message--collapsible:not(.message--collapsed),
.message--expanded {
  max-height: none !important;
  overflow: visible !important;
}

.message--collapsed {
  display: flex !important;
  align-items: baseline !important;
  gap: 8px !important;
  padding: 0.6rem 0 14px 0 !important;
  max-height: none !important;
  height: auto !important;
  overflow: hidden !important;
  cursor: pointer !important;
}

.message--collapsed .message__label {
  display: inline-flex !important;
  align-items: baseline !important;
  flex-shrink: 0 !important;
  margin: 0 !important;
  padding: 0 !important;
}

.message--collapsed .message__body {
  display: block !important;
  flex: 1 1 auto !important;
  min-width: 0 !important;
  overflow: hidden !important;
  white-space: nowrap !important;
  text-overflow: ellipsis !important;
  margin: 0 !important;
  padding: 0 !important;
}

.message--collapsed .message__body>*:not(:first-child) {
  display: none !important;
}

.message--collapsed .message__body>p:first-child {
  display: block !important;
  margin: 0 !important;
  padding: 0 !important;
  white-space: nowrap !important;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
}

/* ── Paragraph spacing inside body ── */
.message__body p {
  margin: 0 0 0.75rem;
  line-height: 1.5;
  /* reading-comfortable line-height for this column width */
  text-align: left;
}

.message__body p:last-child {
  margin-bottom: 0;
}

/* ── Inline elements ── */
.message__body strong {
  font-weight: 700;
  color: var(--text);
}

.message__body em {
  font-style: italic;
}

.message__body a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: border-color 0.15s;
}

.message__body a:hover {
  border-bottom-color: var(--text-2);
}

/* ── Headings within assistant responses ── */
.conv-heading {
  font-family: var(--current-font) !important;
  font-weight: 700 !important;
  color: var(--text) !important;
  line-height: 1.3 !important;
  margin: 1.6em 0 0.6em !important;
}

.conv-heading:first-child {
  margin-top: 0 !important;
}

.conv-heading--1 {
  font-size: 1.15rem !important;
}

.conv-heading--2 {
  font-size: 1.10rem !important;
}

.conv-heading--3 {
  font-size: 1.05rem !important;
  font-weight: 600 !important;
}

.conv-heading--4,
.conv-heading--5,
.conv-heading--6 {
  font-size: 1.0rem !important;
  font-weight: 600 !important;
  color: var(--text-2) !important;
}

/* ── Lists — indented flush with paragraph text, not further left ── */
.conv-list {
  margin: 0.4em 0 0.7em 1.25rem;
  /* intentional: matches paragraph indent */
  padding-left: 0.25rem;
  line-height: 1.5;
}

.conv-list li {
  margin-bottom: 0.2em;
}

.conv-list li:last-child {
  margin-bottom: 0;
}

.conv-list--ordered {
  list-style-type: decimal;
}

.conv-list--unordered {
  list-style-type: disc;
}

/* Nested list */
.conv-list .conv-list {
  margin-top: 0.2em;
  margin-bottom: 0;
}

/* ── Code block ── */
.code-block {
  margin: 0.7em 0;
  border: none;
  border-radius: 8px;
  overflow: hidden;
  font-family: var(--font-mono);
  background: var(--surface-1);
}

.code-block__lang {
  display: none;
}

.code-block__pre {
  margin: 0;
  overflow-x: auto;
  line-height: 1.35;
}

.code-block__code {
  display: block;
  padding: 0.7rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.83rem;
  line-height: 1.35;
  color: var(--text);
  white-space: pre;
  tab-size: 2;
  -moz-tab-size: 2;
}

/* ── Blockquote ── */
.quote-block {
  margin: 1rem 0;
  padding: 0.75em 1.2em;
  border-left: 3px solid var(--border);
  background: var(--surface-1);
  border-radius: 0 4px 4px 0;
  color: var(--text-2);
  font-style: italic;
  font-size: 0.97rem;
}

/* ── Math ── */
.math-block {
  margin: 0.85em 0;
  padding: 0.85em 1.2em;
  background: var(--math-bg);
  border: 1px solid var(--math-border);
  border-radius: 8px;
  overflow-x: auto;
}

.math-block__code {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #7c3aed;
}

/* ── Table ── */
.table-container {
  margin: 0.85em 0;
  overflow-x: auto;
  /* Prevent table from inheriting serif font */
  font-family: var(--font-sans);
}

.table-block {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.87rem;
  line-height: 1.5;
}

.table-block th {
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-2);
  padding: 0.6rem 0.9rem 0.6rem 0;
  border-bottom: 1px solid var(--border);
  text-align: left;
  white-space: nowrap;
}

.table-block td {
  padding: 0.55rem 0.9rem 0.55rem 0;
  border: none;
  border-bottom: 1px solid var(--border-light);
  color: var(--text);
  vertical-align: top;
}

.table-block tbody tr:hover td {
  background: none;
}

/* ── Image block ── */
.image-block {
  margin: 1.8rem auto !important;
  border-radius: 12px !important;
  overflow: hidden !important;
  border: 1px solid var(--border) !important;
  background: var(--border-light) !important;
  width: 100% !important;
  max-width: 100% !important;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03) !important;
  display: block !important;
}

.image-block img {
  display: block !important;
  width: 100% !important;
  max-width: 100% !important;
  height: auto !important;
}

.image-block figcaption {
  padding: 0.5rem 0.85rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--text-3);
  font-style: italic;
  border-top: 1px solid var(--border-light);
  background: #fafafa;
}

/* ── References ── */
.references {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-light);
}

.references__title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: var(--space-md);
}

.references__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.references__item {
  font-size: 0.82rem;
  color: var(--text-2);
}

.references__item a {
  color: #7c3aed;
  border-bottom: 1px solid #e9d5ff;
  text-decoration: none;
  transition: border-color 0.15s;
}

.references__item a:hover {
  border-color: #7c3aed;
}

/* ─── Post Footer ──────────────────────────────────────────────────────────── */

.post-footer {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-light);
  font-size: 0.78rem;
  color: var(--text-3);
}

/* ─── Guest Share CTA ─────────────────────────────────────────────────────── */

.share-cta {
  margin-top: var(--space-2xl);
  padding: var(--space-lg);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-align: center;
  background: var(--share-cta-bg);
}

.share-cta__text {
  font-size: 0.9rem;
  color: var(--text-2);
  margin-bottom: var(--space-md);
}

/* ─── Toast / Feedback ────────────────────────────────────────────────────── */

.toast {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  background: var(--text);
  color: var(--bg);
  padding: var(--space-sm) var(--space-md);
  border-radius: 8px;
  font-size: 0.85rem;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: none;
  z-index: 999;
}

.toast--visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Loading state ───────────────────────────────────────────────────────── */

.loading {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ─── Error page ──────────────────────────────────────────────────────────── */

.error-page {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
}

.error-page__code {
  font-size: 3rem;
  font-weight: 600;
  color: var(--text-3);
  margin-bottom: var(--space-md);
}

.error-page__msg {
  color: var(--text-2);
  margin-bottom: var(--space-lg);
}

/* ─── Responsive ──────────────────────────────────────────────────────────── */

@media (max-width: 640px) {
  html {
    font-size: 18px;
  }

  .container,
  .container--wide {
    padding: 0 var(--space-md);
  }

  .post-header__title {
    font-size: 22px;
  }

  .post-page {
    padding-top: 1.5rem;
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .post-divider {
    margin-left: 0;
  }

  .post-item {
    flex-direction: column;
    gap: var(--space-sm);
    align-items: flex-start;
  }

  .landing__title {
    font-size: 2rem;
  }

  .message {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .message__label {
    width: auto;
    padding-top: 0;
    margin-bottom: var(--space-sm);
  }

  .message__body {
    padding: 0.2rem 0 0.2rem 1.25rem;
  }

  .code-block__code {
    font-size: 0.78rem;
  }
}

/* ─── Navigation Header Layout & Reader Selectors ────────────────────────────── */

.site-header__left {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-header__right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.site-header__back-link {
  font-size: 0.85rem;
  color: var(--text-2);
  font-weight: 500;
  transition: color 0.15s ease;
}

.site-header__back-link:hover {
  color: var(--text);
  text-decoration: none;
}

.nav-reader-select {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-2);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem 2rem 0.35rem 0.75rem;
  cursor: pointer;
  outline: none;
  transition: all 0.15s ease;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23999999'%3e%3cpath d='M7 10l5 5 5-5z'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
  background-size: 14px;
}

.nav-reader-select:hover {
  border-color: var(--text-3);
  color: var(--text);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.nav-reader-select:focus {
  border-color: var(--text-2);
  outline: none !important;
  box-shadow: none !important;
}

/* ─── Font Type Overrides ──────────────────────────────────────────────────── */

html[data-fonttype="sans"] {
  --current-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif !important;
  --font-body: var(--current-font) !important;
  --current-heading-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif !important;
}

html[data-fonttype="inter"] {
  --current-font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif !important;
  --font-body: var(--current-font) !important;
  --current-heading-font: 'Inter', sans-serif !important;
}

html[data-fonttype="open-sans"] {
  --current-font: 'Open Sans', sans-serif !important;
  --font-body: var(--current-font) !important;
  --current-heading-font: 'Open Sans', sans-serif !important;
}

html[data-fonttype="roboto"] {
  --current-font: 'Roboto', sans-serif !important;
  --font-body: var(--current-font) !important;
  --current-heading-font: 'Roboto', sans-serif !important;
}

html[data-fonttype="lato"] {
  --current-font: 'Lato', sans-serif !important;
  --font-body: var(--current-font) !important;
  --current-heading-font: 'Lato', sans-serif !important;
}

html[data-fonttype="serif"] {
  --current-font: "Georgia", "Cambria", "Times New Roman", serif !important;
  --font-body: var(--current-font) !important;
  --current-heading-font: "Georgia", serif !important;
}

html[data-fonttype="merriweather"] {
  --current-font: 'Merriweather', Georgia, serif !important;
  --font-body: var(--current-font) !important;
  --current-heading-font: 'Merriweather', serif !important;
}

html[data-fonttype="lora"] {
  --current-font: 'Lora', Georgia, serif !important;
  --font-body: var(--current-font) !important;
  --current-heading-font: 'Lora', serif !important;
}

html[data-fonttype="georgia"] {
  --current-font: 'Georgia', serif !important;
  --font-body: var(--current-font) !important;
  --current-heading-font: 'Georgia', serif !important;
}

html[data-fonttype="mono"] {
  --current-font: 'Fira Code', 'Courier New', monospace !important;
  --font-body: var(--current-font) !important;
  --current-heading-font: 'Fira Code', monospace !important;
}

/* Ensure headings outside message blocks use the heading font override */
h1,
h2,
h3,
h4,
.blog-page__name {
  font-family: var(--current-heading-font) !important;
}

/* ─── Citations & Footnotes ────────────────────────────────────────────────── */

.citations-wrapper {
  margin-left: 0.15rem;
  display: inline-flex;
  gap: 0.1rem;
}

.citation-link {
  font-size: 0.72rem;
  font-weight: 500;
  font-family: var(--font-sans);
  color: var(--text-2);
  text-decoration: none;
  background-color: var(--code-bg);
  border-radius: var(--radius-sm);
  padding: 0 0.15rem;
  transition: all 0.15s ease;
  vertical-align: super;
  border: 1px solid var(--border-light);
}

.citation-link:hover {
  background-color: var(--text);
  color: var(--bg);
  border-color: var(--text);
  text-decoration: none;
}

/* ─── KaTeX Math Rendering ─────────────────────────────────────────────────── */

.math-display {
  display: block;
  overflow-x: auto;
  margin: var(--space-md) 0;
  text-align: center;
}

.math-inline {
  display: inline;
}

.katex-display {
  margin: var(--space-md) 0;
  overflow-x: auto;
}

.katex {
  font-size: 1.05em;
}

/* ─── File Download Card ──────────────────────────────────────────────────── */
.file-download-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
  margin: var(--space-md) 0;
  max-width: 450px;
  transition: all 0.15s ease;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
}

.file-download-card:hover {
  border-color: var(--text-2);
  background: var(--surface-2);
  text-decoration: none;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.file-download-card__icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--border-light);
  color: var(--text-2);
}

.file-download-card__info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: hidden;
}

.file-download-card__name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
}

.file-download-card__action {
  font-size: 0.72rem;
  color: var(--text-3);
}

/* ─── Webkit Custom Scrollbar ──────────────────────────────────────────────── */

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 9999px;
  border: 3px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-3);
}

/* ─── Top border debug reset ───────────────────────────────────────────────── */
html,
body {
  border-top: none !important;
  outline: none !important;
}

/* ─── Preferences Dropdown ─────────────────────────────────────────────────── */
.preferences-container {
  position: relative;
  display: inline-block;
}

.preferences-btn {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-2);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem 0.75rem;
  cursor: pointer;
  outline: none;
  transition: all 0.15s ease;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
  display: flex;
  align-items: center;
  gap: 4px;
}

.preferences-btn:hover {
  border-color: var(--text-3);
  color: var(--text);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.preferences-btn svg {
  color: var(--text-3);
  transition: transform 0.2s ease;
}

.preferences-container:focus-within .preferences-btn svg {
  color: var(--text-2);
}

.preferences-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06), 0 1px 4px rgba(0, 0, 0, 0.04);
  padding: 0.85rem;
  z-index: 100;
  min-width: 220px;
}

.preferences-menu.show {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.preferences-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.preferences-row label {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-2);
  white-space: nowrap;
}

.preferences-row select {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-2);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.25rem 1.75rem 0.25rem 0.5rem;
  cursor: pointer;
  outline: none;
  transition: all 0.15s ease;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23999999'%3e%3cpath d='M7 10l5 5 5-5z'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 0.4rem center;
  background-size: 12px;
}

.preferences-row select:hover {
  border-color: var(--text-3);
  color: var(--text);
}

/* ─── Checklist ─────────────────────────────────────────────────────────────── */
.conv-checklist {
  list-style: none;
  margin: 0.5em 0 0.9em 0;
  padding: 0;
}

.conv-checklist__item {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.2em 0;
  font-size: inherit;
  line-height: 1.6;
}

.conv-checklist__box {
  flex-shrink: 0;
  font-size: 0.82rem;
  color: var(--text-3);
  width: 1rem;
  text-align: center;
}

.conv-checklist__item--checked .conv-checklist__box {
  color: #16a34a;
  /* green ✓ */
}

.conv-checklist__item--checked .conv-checklist__text {
  text-decoration: line-through;
  color: var(--text-3);
}

.conv-checklist__text {
  color: var(--text);
}

/* ─── SVG Block ──────────────────────────────────────────────────────────────── */
.svg-block {
  margin: 0.85em 0;
  padding: 1rem;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow-x: auto;
  display: flex;
  justify-content: center;
  align-items: center;
}

.svg-block svg {
  max-width: 100%;
  height: auto;
}

/* ─── Image Caption ──────────────────────────────────────────────────────────── */
.image-block__caption {
  display: block;
  margin-top: 0.4rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--text-3);
  text-align: center;
  font-style: italic;
  line-height: 1.4;
}

/* ─── HTML Block (iframe) ────────────────────────────────────────────────────── */
.html-block {
  margin: 1.2em 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg);
}

/* ─── HTML Block Embed Layout (Direct Inline Interactive) ─── */
.html-block--embed {
  margin: 1.2em 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-1);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.html-block--embed:hover {
  border-color: var(--border-light);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.html-block__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: var(--surface-2, rgba(0,0,0,0.02));
  border-bottom: 1px solid var(--border);
}

.html-block__header-left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.html-block__header-left .html-block__card-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--surface-1);
  border: 1px solid var(--border);
  color: var(--text-2);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.html-block__header-info {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.html-block__header-info .html-block__card-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin: 0;
}

.html-block__header-info .html-block__card-meta {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-3);
  background: var(--surface-1);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 4px;
  white-space: nowrap;
}

.html-block__header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.html-block__body {
  width: 100%;
  background: transparent;
}

.html-block__body .html-block__frame {
  width: 100%;
  border: none;
  display: block;
  min-height: 140px;
  background: transparent;
  transition: height 0.2s ease;
}

/* ─── HTML Block Card Layout ─── */
.html-block--card {
  margin: 0.85em 0;
  border: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
  border-radius: 10px;
  background: var(--surface-1);
  overflow: hidden;
  transition: border-color 0.2s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.html-block--card:hover {
  border-color: var(--border);
  background: var(--bg);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.html-block__card-inner {
  display: flex;
  align-items: center;
  padding: 11px 16px;
  gap: 14px;
}

.html-block__card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--surface-2, var(--border-light));
  color: var(--text-2);
  flex-shrink: 0;
}

.html-block__card-info {
  flex: 1;
  min-width: 0;
}

.html-block__card-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.html-block__card-meta {
  font-size: 0.75rem;
  color: var(--text-3);
}

.html-block__preview-btn {
  background: transparent !important;
  border: 1px solid var(--border-light, rgba(0, 0, 0, 0.08)) !important;
  color: var(--text-2) !important;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  height: 30px;
  padding: 0 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.html-block__preview-btn:hover {
  background: var(--surface-1) !important;
  color: var(--text) !important;
  border-color: var(--border) !important;
}

.html-block__download-btn {
  background: transparent !important;
  border: 1px solid var(--border-light, rgba(0, 0, 0, 0.08)) !important;
  color: var(--text-2) !important;
  height: 30px;
  width: 30px;
  padding: 0;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.html-block__download-btn:hover {
  background: var(--surface-1) !important;
  color: var(--text) !important;
  border-color: var(--border) !important;
}

/* ─── Artifact Sidebar Drawer & Side-by-Side Split View ─── */
:root {
  --artifact-panel-width: 50vw;
}

@media (min-width: 1500px) {
  :root {
    --artifact-panel-width: 700px;
  }
}

@media (max-width: 1200px) {
  :root {
    --artifact-panel-width: 50vw;
  }
}

@media (max-width: 1023px) {
  :root {
    --artifact-panel-width: 100vw;
  }
}

.artifact-sidebar {
  position: fixed;
  top: 0;
  right: 0;
  transform: translateX(100%);
  width: var(--artifact-panel-width);
  max-width: 100vw;
  height: 100vh;
  background: var(--bg);
  border-left: 1px solid var(--border-light, rgba(0, 0, 0, 0.05));
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.03);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  transition: transform 360ms cubic-bezier(0.2, 0.8, 0.2, 1), width 360ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.artifact-sidebar.open {
  transform: translateX(0);
}

/* ─── Side-by-Side Content Adjustment with Smooth Fluid Motion ─── */
.post-layout,
.site-header .container--wide {
  transition: margin-right 360ms cubic-bezier(0.2, 0.8, 0.2, 1),
              max-width 360ms cubic-bezier(0.2, 0.8, 0.2, 1),
              padding 360ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

@media (min-width: 1024px) {
  body.artifact-sidebar-open {
    overflow-x: hidden;
  }

  body.artifact-sidebar-open .post-layout {
    margin-right: var(--artifact-panel-width) !important;
    max-width: calc(100vw - var(--artifact-panel-width) - 48px) !important;
    padding-left: 32px !important;
    padding-right: 32px !important;
  }

  body.artifact-sidebar-open .site-header .container--wide {
    margin-right: var(--artifact-panel-width) !important;
    max-width: calc(100vw - var(--artifact-panel-width)) !important;
  }

  body.artifact-sidebar-open .reading-progress {
    max-width: calc(100vw - var(--artifact-panel-width)) !important;
  }
}

.artifact-sidebar__header {
  padding: 0.95rem 1.4rem;
  border-bottom: 1px solid var(--border-light, rgba(0, 0, 0, 0.04));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--bg);
  flex-shrink: 0;
}

.artifact-sidebar__header-info {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.artifact-sidebar__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 6px;
  background: var(--surface-1);
  color: var(--text-2);
  flex-shrink: 0;
}

.artifact-sidebar__title-group {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.artifact-sidebar__header h3 {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 240px;
}

.artifact-sidebar__badge {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 7px;
  border-radius: 4px;
  background: var(--surface-1);
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  flex-shrink: 0;
}

.artifact-sidebar__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.artifact-sidebar__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  height: 28px;
  border-radius: 6px;
  border: 1px solid var(--border-light, rgba(0, 0, 0, 0.08));
  background: transparent;
  color: var(--text-2);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease;
}

.artifact-sidebar__btn:hover {
  background: var(--surface-1);
  color: var(--text);
  border-color: var(--border);
}

.artifact-sidebar__btn--primary {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.artifact-sidebar__btn--primary:hover {
  background: var(--text);
  opacity: 0.88;
  color: var(--bg);
}

.artifact-sidebar__close-btn {
  background: transparent;
  border: none;
  color: var(--text-3);
  cursor: pointer;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
  padding: 0;
}

.artifact-sidebar__close-btn:hover {
  background: var(--surface-1);
  color: var(--text);
}

.artifact-sidebar__body {
  flex: 1;
  overflow-y: auto;
  position: relative;
  background: var(--bg);
}

.artifact-sidebar__frame {
  width: 100%;
  height: 100%;
  border: none;
  background: transparent;
}

.artifact-sidebar__rendered {
  padding: 2rem 2.25rem;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
}

.artifact-markdown-content h1.artifact-h1 {
  font-size: 24px;
  font-weight: 700;
  margin: 0 0 16px;
  color: var(--text);
  line-height: 1.3;
}

.artifact-markdown-content h2.artifact-h2 {
  font-size: 18px;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--text);
  line-height: 1.35;
}

.artifact-markdown-content h3.artifact-h3 {
  font-size: 15px;
  font-weight: 600;
  margin: 20px 0 8px;
  color: var(--text);
}

.artifact-markdown-content p.artifact-p {
  margin: 0 0 14px;
  color: var(--text);
}

.artifact-markdown-content blockquote.artifact-quote {
  margin: 16px 0;
  padding: 10px 16px;
  border-left: 3px solid var(--accent, var(--text));
  background: var(--surface-1, #f6f8fa);
  color: var(--text-2);
  border-radius: 0 6px 6px 0;
}

.artifact-markdown-content ul.artifact-list {
  margin: 0 0 16px 20px;
  padding: 0;
}

.artifact-markdown-content li.artifact-list-item {
  margin-bottom: 6px;
  color: var(--text);
}

.artifact-markdown-content code.artifact-inline-code {
  font-family: var(--font-mono, monospace);
  font-size: 13px;
  padding: 2px 6px;
  background: var(--surface-1, #f4f4f5);
  border-radius: 4px;
  color: var(--text);
}

.artifact-markdown-content pre.artifact-code-block,
.artifact-code-content {
  background: var(--surface-1, #f4f4f5);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 18px;
  font-family: var(--font-mono, monospace);
  font-size: 13px;
  line-height: 1.5;
  overflow-x: auto;
  margin: 16px 0;
  color: var(--text);
}

.file-artifact-card {
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.file-artifact-card:hover {
  transform: translateY(-1px);
  border-color: var(--text-3);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.html-block__frame {
  width: 100%;
  border: none;
  height: 120px;
  /* initial; grows via postMessage */
  display: block;
  overflow: hidden;
  transition: height 0.25s ease;
}

/* ─── Mermaid Block ──────────────────────────────────────────────────────────── */
.mermaid-block {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.2rem;
  margin: 0.85em 0;
  overflow-x: auto;
  display: flex;
  justify-content: center;
}

/* ─── Prism.js Theme Override ────────────────────────────────────────────────── */
/* Prism-tomorrow's pre/code reset — keep our padding/font settings */
.code-block__pre code[class*="language-"],
.code-block__pre pre[class*="language-"] {
  font-family: var(--font-mono);
  font-size: 0.83rem;
  line-height: 1.35;
  background: transparent;
  padding: 0;
  margin: 0;
  text-shadow: none;
}

/* Prism tomorrow colors — match code-block background */
pre[class*="language-"],
code[class*="language-"] {
  background: transparent;
}

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: var(--text-3);
}

/* ─── Math block — KaTeX aware ───────────────────────────────────────────────── */
.math-block--block {
  font-size: 1rem;
  text-align: center;
}

.math-block--inline {
  display: inline;
  padding: 0;
  background: none;
  border: none;
  margin: 0;
}

/* Ensure KaTeX renders at readable size */
.katex {
  font-size: 1.05em;
}

.katex-display {
  overflow-x: auto;
}

/* ─── Strikethrough ──────────────────────────────────────────────────────────── */
del {
  color: var(--text-3);
  text-decoration-color: var(--text-3);
}

/* ─── Citation badge ─────────────────────────────────────────────────────────── */
.citation-link {
  display: inline-block;
  font-size: 0.72rem;
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--text-2);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0 3px;
  text-decoration: none;
  vertical-align: super;
  line-height: 1.4;
  transition: background 0.1s, color 0.1s;
}

.citation-link:hover {
  background: var(--surface-1);
  color: var(--text);
}

.citations-wrapper {
  font-size: 0.75em;
  vertical-align: super;
}

/* ─── Toggle Switch & Action Icon Styling ─── */

.toggle-container {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 32px;
  height: 18px;
  flex-shrink: 0;
  vertical-align: middle;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #d1d5db;
  /* silver inactive */
  transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 18px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 12px;
  width: 12px;
  left: 3px;
  bottom: 3px;
  background-color: var(--bg);
  transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 50%;
}

.toggle-switch input:checked+.toggle-slider {
  background-color: #2563eb;
  /* Mockup active blue */
}

.toggle-switch input:checked+.toggle-slider:before {
  transform: translateX(14px);
}

.toggle-label-text {
  font-size: 0.82rem;
  color: var(--text-2);
  user-select: none;
}

.btn-action-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  width: 32px;
  height: 32px;
  padding: 0;
  color: #9ca3af;
  /* muted gray */
  cursor: pointer;
  transition: color 0.15s;
}

.btn-action-icon:hover {
  color: var(--text);
}

.btn-action-icon--danger:hover {
  color: #ef4444;
  /* Premium Soft Red */
}

/* ─── Redesigned Post Header ─── */
.post-header {
  margin-bottom: 0;
}

.post-header__title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 8px 0;
  color: var(--text);
}

.post-header__subtitle {
  font-size: 16px;
  color: var(--text-3);
  margin: 0 0 18px 0;
  line-height: 1.5;
}

.post-header__meta-row-new {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--text-2);
}

.post-header__avatar {
  display: none;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #eef2ff;
  color: #4f46e5;
  font-weight: 700;
  font-size: 0.8rem;
}

.post-header__avatar.visible {
  display: flex;
}

[data-theme="dark"] .post-header__avatar {
  background: #312e81;
  color: #818cf8;
}

.post-header__author {
  font-weight: 600;
  color: var(--text);
}

.post-header__pipe {
  color: var(--border);
  margin: 0 4px;
}

.post-header__meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-3);
}

.post-header__meta-item svg.meta-icon {
  color: var(--text-3);
  opacity: 0.85;
}

.post-header__divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 20px 0;
}

.post-header__controls-row-new {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.btn-control-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  height: 30px;
  border-radius: 50px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-2);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-control-badge:hover {
  border-color: var(--border-light);
  background: var(--surface-1);
  color: var(--text);
}

.btn-control-badge svg.control-icon {
  color: var(--text-3);
  transition: color 0.2s;
}

.btn-control-badge:hover svg.control-icon {
  color: var(--text);
}

/* Specific button styles if active */
.btn-control-badge.liked {
  background: #fee2e2;
  border-color: #fca5a5;
  color: #ef4444;
}

.btn-control-badge.liked svg.control-icon {
  color: #ef4444;
  fill: #ef4444;
}

/* ── Like and Comment Controls ── */
.btn-like {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.4rem 0.85rem;
  color: var(--text-2);
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.btn-like:hover {
  background: var(--border-light);
  color: var(--text);
}

.btn-like.liked {
  color: #ef4444 !important;
  border-color: #fca5a5 !important;
  background: #fef2f2 !important;
}

html[data-theme="synthwave"] .btn-like.liked {
  background: #2e1018 !important;
  border-color: #ef4444 !important;
}

.btn-comment-scroll {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--text-2);
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  padding: 0.4rem 0.85rem;
  transition: color 0.15s;
}

.btn-comment-scroll:hover {
  color: var(--text);
}

/* Option Card Widget (Claude Interactive Selection) */
.option-card {
  margin: var(--space-3) 0 !important;
  padding: 16px 20px !important;
  background: var(--surface) !important;
  border: 1px solid var(--border) !important;
  border-radius: 12px !important;
  box-sizing: border-box !important;
  width: 100% !important;
  display: flex !important;
  flex-direction: column !important;
  gap: 14px !important;
  transition: border-color 150ms ease, background 150ms ease !important;
}

.option-card__item {
  display: flex !important;
  flex-direction: column !important;
  gap: 4px !important;
}

.option-card__question {
  font-family: var(--font-body) !important;
  font-size: 14px !important;
  font-weight: 400 !important;
  color: var(--text-2) !important;
  line-height: 1.4 !important;
}

.option-card__answer {
  font-family: var(--font-body) !important;
  font-size: 15px !important;
  font-weight: 600 !important;
  color: var(--text-1) !important;
  line-height: 1.4 !important;
}

.comments-section {
  margin-top: var(--space-8) !important;
  padding-top: var(--space-8) !important;
  border-top: 1px solid var(--border) !important;
}

.comments-title {
  font-family: var(--font-display) !important;
  font-size: 21px !important;
  /* Up from 18px — feels like a real section */
  font-weight: 600 !important;
  color: var(--text) !important;
  display: flex !important;
  align-items: center !important;
  gap: 8px !important;
  margin-bottom: var(--space-5) !important;
}

#comment-count-title {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  min-width: 22px !important;
  height: 22px !important;
  padding: 0 8px !important;
  background: var(--surface-2) !important;
  color: var(--text-2) !important;
  border-radius: 999px !important;
  font-size: 12px !important;
  font-weight: 600 !important;
}

.comments-list {
  display: flex !important;
  flex-direction: column !important;
  gap: var(--space-5) !important;
  margin-bottom: var(--space-6) !important;
}

.comment-card {
  padding: var(--space-4) 0 !important;
  border-bottom: 1px solid var(--border-light) !important;
  /* lighter separator */
}

.comment-card:last-child {
  border-bottom: none !important;
}

.comment-header,
.reply-header {
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  margin-bottom: var(--space-2) !important;
  font-size: 13px !important;
}

.comment-author-wrap {
  display: inline-flex !important;
  align-items: center !important;
  gap: 8px !important;
}

.comment-avatar {
  width: 26px !important;
  height: 26px !important;
  border-radius: 50% !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  font-size: 11px !important;
  font-weight: 700 !important;
  font-family: var(--font-sans) !important;
  flex-shrink: 0 !important;
  text-transform: uppercase !important;
  user-select: none !important;
}

.comment-avatar--sm {
  width: 20px !important;
  height: 20px !important;
  font-size: 9.5px !important;
}

[data-theme="dark"] .comment-avatar,
[data-theme="midnight"] .comment-avatar {
  filter: brightness(0.85) saturate(0.9) !important;
}

.comment-author,
.reply-author {
  font-weight: 600 !important;
  color: var(--text-1) !important;
}

.comment-date {
  color: var(--text-3) !important;
  font-size: 12px !important;
}

.comment-body {
  font-size: 15px !important;
  font-family: var(--font-sans) !important;
  /* sans for comment text — easier scan */
  color: var(--text-2) !important;
  line-height: 1.68 !important;
  /* Up from 1.55 — much more comfortable */
  white-space: pre-wrap !important;
}

/* Nested replies */
.comment-replies {
  margin-top: var(--space-4) !important;
  margin-left: var(--space-4) !important;
  padding-left: var(--space-4) !important;
  border-left: 3px solid var(--accent) !important;
  /* accent line, not plain border */
  display: flex !important;
  flex-direction: column !important;
  gap: var(--space-3) !important;
}

.reply-card {
  background: var(--surface) !important;
  padding: var(--space-3) var(--space-4) !important;
  border-radius: var(--r-md) !important;
  border: 1px solid var(--border) !important;
}

.reply-header {
  display: flex !important;
  justify-content: space-between !important;
  font-size: 12px !important;
  margin-bottom: var(--space-1) !important;
}

.reply-author {
  font-weight: 600 !important;
  color: var(--text-1) !important;
}

.reply-date {
  color: var(--text-3) !important;
}

.reply-body {
  font-size: 14px !important;
  color: var(--text-2) !important;
  line-height: 1.5 !important;
}

/* Comment Form */
.comment-form {
  background: transparent !important;
  padding: 0 !important;
  border: none !important;
}

.comment-form__title {
  font-family: var(--font-display) !important;
  font-size: 15px !important;
  font-weight: 600 !important;
  margin-top: var(--space-6) !important;
  margin-bottom: var(--space-4) !important;
  color: var(--text) !important;
  text-transform: none !important;
  letter-spacing: normal !important;
}

.comment-form__group {
  margin-bottom: var(--space-4) !important;
}

.comment-form__input,
.comment-form__textarea {
  width: 100% !important;
  height: 40px !important;
  background: var(--bg) !important;
  border: 1px solid var(--border) !important;
  border-radius: 8px !important;
  /* Up from 4px — matches site's rounded aesthetic */
  padding: var(--space-2) var(--space-3) !important;
  font-family: var(--font-sans) !important;
  /* FIXED: was var(--font-body)=Lora. Forms must use sans */
  font-size: 15px !important;
  color: var(--text) !important;
  box-sizing: border-box !important;
  transition: border-color 150ms ease, box-shadow 150ms ease !important;
}

.comment-form__input::placeholder,
.comment-form__textarea::placeholder {
  color: var(--text-3) !important;
  font-style: italic !important;
  /* warm, inviting placeholder */
  opacity: 1 !important;
}

.comment-form__textarea {
  height: auto !important;
  min-height: 96px !important;
  resize: vertical !important;
}

.comment-form__input:focus,
.comment-form__textarea:focus {
  outline: none !important;
  border-color: var(--text-2) !important;
  box-shadow: 0 0 0 3px rgba(24, 24, 27, 0.1) !important;
  /* stronger, visible focus ring */
}

/* Sienna Accent Links */
.blog-content a,
.message__body a {
  color: var(--text) !important;
  text-decoration: underline !important;
  text-decoration-color: var(--border) !important;
  text-decoration-thickness: 1px !important;
  text-underline-offset: 3px !important;
  transition: color 150ms ease !important;
}

.blog-content a:hover,
.message__body a:hover {
  color: var(--accent) !important;
}

/* Clean Accent Buttons */
.btn--primary,
#comment-form button[type="submit"],
.comment-form__submit {
  background: var(--text) !important;
  color: var(--bg) !important;
  border: 1px solid var(--text) !important;
  padding: var(--space-2) var(--space-5) !important;
  border-radius: 99px !important;
  /* Pill shape — matches action buttons */
  font-family: var(--font-sans) !important;
  font-weight: 600 !important;
  font-size: 14px !important;
  cursor: pointer !important;
  transition: opacity 150ms ease, transform 150ms ease, box-shadow 150ms ease !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  line-height: 1 !important;
}

.btn--primary:hover,
#comment-form button[type="submit"]:hover,
.comment-form__submit:hover {
  opacity: 0.88 !important;
  transform: translateY(-1px) !important;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12) !important;
}

.btn--outline {
  background: transparent !important;
  color: var(--accent) !important;
  border: 1px solid var(--accent) !important;
  padding: var(--space-2) var(--space-4) !important;
  border-radius: var(--r-md) !important;
  font-family: var(--font-display) !important;
  font-weight: 600 !important;
  font-size: 13px !important;
  text-decoration: none !important;
  display: inline-flex !important;
  align-items: center !important;
  gap: var(--space-2) !important;
  transition: all 150ms ease !important;
}

.btn--outline:hover {
  background: var(--accent-soft) !important;
}

/* Dashboard comments UI */
.dashboard-comment-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
  background: var(--surface-1);
}

.dashboard-comment-meta {
  font-size: 0.78rem;
  color: var(--text-3);
  margin-bottom: 0.5rem;
}

.dashboard-comment-meta a {
  color: #3b82f6;
  text-decoration: none;
  font-weight: 500;
}

.dashboard-comment-meta a:hover {
  text-decoration: none;
}

.dashboard-comment-author {
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--text);
}

.dashboard-comment-text {
  font-size: 0.92rem;
  color: var(--text-2);
  margin-bottom: 1rem;
  white-space: pre-wrap;
}

.dashboard-reply-form {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}

.dashboard-reply-input {
  flex-grow: 1;
  padding: 0.4rem 0.6rem;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
}

/* ─── User-Requested Blog Page Design Enhancements ───────────────────────── */

/* 1. Body container override for post/share pages */
/* Selection color */
::selection {
  background: var(--accent-soft) !important;
}

/* Smooth scroll and scroll padding */
html {
  scroll-behavior: smooth !important;
  scroll-padding-top: 80px !important;
}

/* 1. Body container override for post/share pages */
.post-page {
  font-family: var(--font-body) !important;
  line-height: 1.65 !important;
  color: var(--text) !important;
  font-size: 15.5px !important;
  max-width: 740px !important;
  margin: 0 auto !important;
  padding: 0 24px !important;
}

/* 2. Top nav / header bar */
.site-header {
  position: sticky !important;
  top: 0 !important;
  z-index: 50 !important;
  /* Semi-transparent so backdrop-filter blur actually has an effect */
  background: rgba(249, 247, 244, 0.85) !important;
  backdrop-filter: blur(18px) saturate(1.4) !important;
  -webkit-backdrop-filter: blur(18px) saturate(1.4) !important;
  height: 56px !important;
  box-sizing: border-box !important;
  padding: 0 !important;
  margin-bottom: var(--space-6) !important;
  border-bottom: 1px solid var(--border) !important;
  transition: border-color 200ms ease, background 200ms ease, padding-left 250ms cubic-bezier(0.16, 1, 0.3, 1) !important;
}

html[data-theme="dark"] .site-header,
html[data-theme="midnight"] .site-header,
html[data-theme="lavender"] .site-header,
html[data-theme="aurora"] .site-header,
html[data-theme="synthwave"] .site-header,
html[data-theme="neon-pink"] .site-header,
html[data-theme="cyber-green"] .site-header {
  background: rgba(15, 15, 15, 0.82) !important;
}

.site-header--scrolled {
  border-bottom-color: var(--border) !important;
}

.site-header__inner {
  height: 56px !important;
  box-sizing: border-box !important;
  max-width: 1280px !important;
  /* Ghost/Substack standard outer shell */
  margin: 0 auto !important;
  padding: 0 32px !important;
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
}

/* Reading Progress Bar */
.reading-progress {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  height: 3px !important;
  /* Up from 2px — more visible */
  background: linear-gradient(90deg, var(--accent) 0%, var(--text-3) 120%) !important;
  width: 0% !important;
  z-index: 100 !important;
  border-radius: 0 2px 2px 0 !important;
  transition: width 100ms linear !important;
}

/* 3. Title block */
.post-header__title {
  font-family: var(--font-display) !important;
  font-size: 32px !important;
  font-weight: 750 !important;
  line-height: 1.2 !important;
  letter-spacing: -0.025em !important;
  color: var(--text) !important;
  margin: 1.5rem 0 0.35rem 0 !important;
}

.post-header__subtitle {
  font-family: var(--font-body) !important;
  font-style: italic !important;
  color: var(--text-3) !important;
  margin: 0 0 1.25rem 0 !important;
  font-size: 15px !important;
  line-height: 1.5 !important;
  font-weight: 400 !important;
}

/* 4. Meta row (author, date, message count) */
.post-header__meta-row-new {
  display: flex !important;
  align-items: center !important;
  gap: var(--space-2) !important;
  flex-wrap: wrap !important;
  padding-bottom: 0 !important;
  margin-bottom: var(--space-3) !important;
  border-bottom: none !important;
}

.post-header__avatar {
  width: 22px !important;
  height: 22px !important;
  border-radius: 50% !important;
  background: #ede9fe !important;
  color: #6366f1 !important;
  font-weight: 700 !important;
  font-size: 11px !important;
  display: none !important;
  align-items: center !important;
  justify-content: center !important;
  box-shadow: none !important;
  flex-shrink: 0 !important;
}

.post-header__avatar.visible {
  display: inline-flex !important;
}

[data-theme="dark"] .post-header__avatar,
[data-theme="midnight"] .post-header__avatar {
  background: #2e1065 !important;
  color: #a78bfa !important;
  box-shadow: none !important;
}

.post-header__avatar-img {
  width: 22px !important;
  height: 22px !important;
  border-radius: 50% !important;
  object-fit: cover !important;
  flex-shrink: 0 !important;
  display: inline-block !important;
}

.post-header__author {
  font-size: 13.5px !important;
  font-weight: 600 !important;
  color: var(--text) !important;
}

.post-header__pipe {
  display: none !important;
}

.post-header__meta-item {
  font-size: 13px !important;
  color: var(--text-3) !important;
  display: inline-flex !important;
  align-items: center !important;
  gap: 4px !important;
}

.post-header__meta-item::before {
  content: '·' !important;
  margin-right: 4px !important;
  color: var(--text-3) !important;
}

.post-header__meta-item:first-of-type::before {
  display: none !important;
}

.post-header__meta-item svg {
  display: none !important;
}

.post-header__divider {
  display: none !important;
}

.post-header {
  border: none !important;
  border-bottom: 1px solid var(--border) !important;
  padding-bottom: 20px !important;
  margin-bottom: 28px !important;
  box-shadow: none !important;
}

.post-page .toc-mobile {
  display: none !important;
}

.post-page .conversation {
  border-top: none !important;
}

/* 5. Action buttons row — compact, refined pill badges */
.post-header__controls-row-new {
  display: flex !important;
  justify-content: flex-start !important;
  align-items: center !important;
  gap: 8px !important;
  flex-wrap: wrap !important;
  margin-bottom: 0 !important;
  border-bottom: none !important;
}

/* Base style for all control buttons */
.post-header__controls-row-new button,
.post-header__controls-row-new a,
.post-header__controls-row-new .btn-control-badge {
  display: inline-flex !important;
  align-items: center !important;
  gap: 5px !important;
  height: 28px !important;
  padding: 0 10px !important;
  background: var(--bg) !important;
  border: 1px solid var(--border) !important;
  border-radius: 99px !important;
  font-size: 12px !important;
  font-weight: 500 !important;
  font-family: var(--font-sans) !important;
  color: var(--text-2) !important;
  cursor: pointer !important;
  transition: all 150ms ease !important;
  box-shadow: none !important;
  text-decoration: none !important;
}

.post-header__controls-row-new button:hover,
.post-header__controls-row-new a:hover,
.post-header__controls-row-new .btn-control-badge:hover {
  background: var(--surface-1) !important;
  border-color: var(--text-3) !important;
  color: var(--text) !important;
  transform: translateY(-1px) !important;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04) !important;
}

.post-header__controls-row-new button svg,
.post-header__controls-row-new a svg,
.post-header__controls-row-new .btn-control-badge svg {
  width: 13px !important;
  height: 13px !important;
  color: var(--text-3) !important;
  stroke: currentColor !important;
  transition: color 150ms ease !important;
}

.post-header__controls-row-new button:hover svg,
.post-header__controls-row-new a:hover svg,
.post-header__controls-row-new .btn-control-badge:hover svg {
  color: var(--text) !important;
}

/* Share button — primary CTA: compact dark pill */
#share-post-btn {
  background: var(--text) !important;
  color: var(--bg) !important;
  border-color: var(--text) !important;
  font-weight: 600 !important;
  padding: 0 12px !important;
}

#share-post-btn:hover {
  opacity: 0.9 !important;
  transform: translateY(-1px) !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12) !important;
}

#share-post-btn svg {
  color: var(--bg) !important;
  width: 12px !important;
  height: 12px !important;
}

/* Collapse/expand button */
#toggle-all-btn {
  background: var(--bg) !important;
  border: 1px solid var(--border) !important;
  color: var(--text-2) !important;
  font-weight: 500 !important;
}

#toggle-all-btn:hover {
  background: var(--surface-1) !important;
  border-color: var(--text-3) !important;
  color: var(--text) !important;
  transform: translateY(-1px) !important;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04) !important;
}

/* 6. Each message/turn block */
.post-page .message {
  padding: 0 !important;
  border-bottom: none !important;
  transition: opacity 0.2s ease !important;
}

/* Allow long messages to expand fully without clipping or box overflow */
.post-page .message--collapsible:not(.message--collapsed),
.post-page .message--expanded {
  max-height: none !important;
  overflow: visible !important;
}

.post-page .message--user {
  margin-bottom: var(--space-5) !important;
  padding-bottom: 0 !important;
}

.post-page .message--user .message__body,
.post-page .message--user .message__body>p,
.post-page .message--user .message__body>span {
  font-family: var(--font-body) !important;
  font-size: 15.5px !important;
  font-weight: 400 !important;
  line-height: 1.65 !important;
  color: var(--text) !important;
  letter-spacing: normal !important;
}

.post-page .message--assistant {
  display: block !important;
  margin-bottom: 28px !important;
  padding-bottom: 28px !important;
  border-bottom: 1px solid var(--border) !important;
}

/* Generous gap between consecutive assistant blocks */
.post-page .message--assistant+.message--assistant {
  margin-top: 0 !important;
}

.post-page .message--assistant .message__label {
  display: block !important;
  margin-bottom: var(--space-3) !important;
}

.post-page .message--assistant .message__body {
  width: 100% !important;
  margin-left: 0 !important;
  padding-left: 0 !important;
  display: block !important;
  font-family: var(--font-body) !important;
  font-size: 15.5px !important;
  font-weight: 400 !important;
  line-height: 1.65 !important;
  color: var(--text) !important;
}

.post-page .message__body p,
.post-page .message__body li,
.post-page .message__body span {
  color: var(--text) !important;
}

.post-page .message__body strong,
.post-page .message__body b {
  color: var(--text) !important;
  font-weight: 600 !important;
}

.post-page .message--assistant .message__body--collapsible {
  margin-left: 0 !important;
  padding-left: 0 !important;
}

.post-page .message--assistant .message__body p:first-child {
  display: block !important;
}

.post-page .message:last-child {
  border-bottom: none !important;
}

/* Unified, Consistent Role Labels (You: and Claude: / ChatGPT: / Gemini:) */
.post-page .message__label,
.post-page .message--user .message__label,
.post-page .message--assistant .message__label {
  display: flex !important;
  align-items: center !important;
  gap: 8px !important;
  margin-bottom: 8px !important;
  opacity: 1 !important;
}

.post-page .message__role-label,
.post-page .message__role-label--user {
  font-family: var(--font-display) !important;
  font-size: 15px !important;
  font-weight: 700 !important;
  color: var(--text) !important;
  opacity: 1 !important;
  text-transform: none !important;
  letter-spacing: -0.01em !important;
}

.post-page .message:not(.message--collapsed) .message__body p,
.post-page .message--expanded .message__body p {
  text-align: left !important;
  text-justify: auto !important;
  text-align-last: left !important;
  hyphens: auto;
}

/* Breakout layout for code & image blocks */
.post-page .code-block,
.post-page .image-block,
.post-page .blog-content>pre {
  margin-left: 0 !important;
  margin-right: 0 !important;
  max-width: 100% !important;
}

/* 6b. Collapsed state overrides for post-page */
.post-page .message--collapsed {
  display: flex !important;
  align-items: baseline !important;
  gap: 8px !important;
  padding: 0.6rem 0 14px 0 !important;
  margin-bottom: 16px !important;
  border-bottom: none !important;
  max-height: none !important;
  height: auto !important;
  overflow: hidden !important;
  cursor: pointer !important;
  opacity: 1 !important;
}

.post-page .message--collapsed .message__label {
  display: inline-flex !important;
  align-items: baseline !important;
  flex-shrink: 0 !important;
  margin: 0 !important;
  padding: 0 !important;
  font-weight: 600 !important;
}

.post-page .message--collapsed .message__body {
  display: block !important;
  flex: 1 1 auto !important;
  min-width: 0 !important;
  overflow: hidden !important;
  white-space: nowrap !important;
  text-overflow: ellipsis !important;
  color: var(--text-2) !important;
  margin: 0 !important;
  padding: 0 !important;
}

.post-page .message--collapsed .message__body>*:not(:first-child) {
  display: none !important;
}

.post-page .message--collapsed .message__body>p:first-child {
  display: block !important;
  margin: 0 !important;
  padding: 0 !important;
  white-space: nowrap !important;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
}

/* 7. Section headers WITHIN a message (h2/h3/bold labels) */
.message__body h2,
.blog-content h2,
.conv-heading--2 {
  font-family: var(--font-display) !important;
  font-size: 24px !important;
  margin: var(--space-7) 0 var(--space-4) !important;
  /* Reduced from 64px → 48px top gap */
  font-weight: 700 !important;
  line-height: 1.25 !important;
  letter-spacing: -0.02em !important;
  color: var(--text) !important;
}

.message__body h3,
.blog-content h3,
.conv-heading--3,
.message__body .section-label {
  font-family: var(--font-display) !important;
  font-size: 19px !important;
  margin: 28px 0 var(--space-3) !important;
  /* Reduced from 32px → 28px top gap */
  font-weight: 600 !important;
  line-height: 1.35 !important;
  letter-spacing: -0.01em !important;
  color: var(--text) !important;
}

.message__body h4,
.blog-content h4,
.conv-heading--4 {
  font-family: var(--font-display) !important;
  font-size: 17px !important;
  margin: var(--space-5) 0 var(--space-2) !important;
  font-weight: 600 !important;
  line-height: 1.35 !important;
  color: var(--text) !important;
}

.message__body h2:first-child,
.message__body h3:first-child {
  margin-top: 0 !important;
}

/* 8. Paragraphs */
.message__body p,
.blog-content p {
  font-family: var(--font-body) !important;
  font-size: 15.5px !important;
  font-weight: 400 !important;
  line-height: 1.65 !important;
  color: var(--text) !important;
  margin: 0 0 14px !important;
  display: block !important;
  word-break: break-word !important;
  overflow-wrap: break-word !important;
}

.message__body p:last-child {
  margin-bottom: 0 !important;
}

/* 9. Lists & Inline Code Pills */
.message__body ul,
.message__body ol {
  margin: 0 0 var(--space-4) 0 !important;
  padding-left: 20px !important;
  box-sizing: border-box !important;
}

.message__body li {
  margin-bottom: 6px !important;
  font-size: 15.5px !important;
  line-height: 1.65 !important;
  padding-left: 4px !important;
  word-break: break-word !important;
  overflow-wrap: break-word !important;
}

.message__body li:last-child {
  margin-bottom: 0 !important;
}

.message__body li>ul,
.message__body li>ol {
  margin-top: var(--space-2) !important;
  margin-bottom: 0 !important;
  padding-left: 18px !important;
}

/* Inline Code Pills */
.message__body code:not(pre code),
.blog-content code:not(pre code),
p code,
li code {
  font-family: var(--font-mono, 'Fira Code', 'JetBrains Mono', monospace) !important;
  font-size: 0.88em !important;
  color: var(--text-1) !important;
  background: var(--surface) !important;
  border: 1px solid var(--border) !important;
  border-radius: 4px !important;
  padding: 2px 6px !important;
  margin: 0 2px !important;
  vertical-align: baseline !important;
  white-space: nowrap !important;
  box-sizing: border-box !important;
}

/* File Download Artifact Card */
.file-download-card {
  display: flex !important;
  align-items: center !important;
  gap: var(--space-3) !important;
  margin: var(--space-4) 0 !important;
  padding: 12px 16px !important;
  background: var(--surface) !important;
  border: 1px solid var(--border) !important;
  border-radius: var(--r-lg) !important;
  /* 8px */
  text-decoration: none !important;
  color: var(--text-1) !important;
  box-sizing: border-box !important;
  width: fit-content !important;
  max-width: 100% !important;
  transition: border-color 150ms ease, background 150ms ease, box-shadow 150ms ease !important;
}

.file-download-card:hover {
  border-color: var(--text-3) !important;
  background: var(--surface-2, var(--surface)) !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04) !important;
}

.file-download-card__icon {
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  width: 36px !important;
  height: 36px !important;
  border-radius: var(--r-md) !important;
  background: var(--surface-2) !important;
  color: var(--accent) !important;
  flex-shrink: 0 !important;
}

.file-download-card__info {
  display: flex !important;
  flex-direction: column !important;
  gap: 2px !important;
  overflow: hidden !important;
}

.file-download-card__name {
  font-family: var(--font-body) !important;
  font-size: 14px !important;
  font-weight: 600 !important;
  color: var(--text-1) !important;
  white-space: nowrap !important;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
}

.file-download-card__action {
  font-family: var(--font-body) !important;
  font-size: 12px !important;
  color: var(--text-3) !important;
}

/* 10. Code / preview cards & Image Block Unification */
.code-block,
.image-block {
  background: var(--surface) !important;
  border: 1px solid var(--border) !important;
  border-radius: var(--r-lg) !important;
  /* 8px */
  overflow: hidden !important;
  margin: var(--space-5) 0 !important;
  transition: box-shadow 200ms ease, transform 200ms ease !important;
}

.code-block:hover,
.image-block:hover {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04) !important;
}

.code-block {
  position: relative !important;
  background: var(--surface) !important;
  border: 1px solid var(--border) !important;
  border-radius: var(--r-lg) !important;
  overflow: hidden !important;
  margin: var(--space-5) 0 !important;
  transition: box-shadow 200ms ease, transform 200ms ease !important;
}

.code-block__header {
  position: sticky !important;
  top: 0 !important;
  z-index: 5 !important;
  display: flex !important;
  justify-content: space-between !important;
  align-items: center !important;
  padding: 7px 14px !important;
  background: var(--surface-2, #f9fafb) !important;
  border-bottom: 1px solid var(--border) !important;
  font-family: var(--font-display, inherit) !important;
  font-size: 11px !important;
  font-weight: 600 !important;
  color: var(--text-3, #6b7280) !important;
  text-transform: uppercase !important;
  letter-spacing: 0.06em !important;
  backdrop-filter: blur(8px) !important;
}

.code-block__actions {
  display: inline-flex !important;
  align-items: center !important;
  gap: 6px !important;
}

.code-block__expand,
.code-block__copy {
  background: transparent !important;
  border: 1px solid transparent !important;
  cursor: pointer !important;
  color: var(--text-3, #6b7280) !important;
  font-family: var(--font-display, inherit) !important;
  font-size: 11.5px !important;
  font-weight: 500 !important;
  padding: 3px 8px !important;
  border-radius: 5px !important;
  transition: all 150ms ease !important;
  display: inline-flex !important;
  align-items: center !important;
  gap: 4px !important;
  line-height: 1.2 !important;
}

.code-block__expand:hover,
.code-block__copy:hover {
  background: var(--surface, #fff) !important;
  border-color: var(--border) !important;
  color: var(--text) !important;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05) !important;
}

.code-block__copy--copied {
  color: #10B981 !important;
  font-weight: 600 !important;
}

.message__body .code-block pre,
.message__body pre,
.code-block pre,
.code-block__pre {
  margin: 0 !important;
  padding: 1rem 1.25rem !important;
  font: 13.5px/1.6 var(--font-mono-redesign, 'JetBrains Mono', 'Fira Code', monospace) !important;
  color: var(--text) !important;
  background: var(--surface) !important;
  overflow-x: auto !important;
  overflow-y: auto !important;
  max-height: 420px !important;
  border: none !important;
  border-radius: 0 !important;
  scroll-behavior: smooth !important;
  scrollbar-width: thin !important;
  scrollbar-color: var(--border) transparent !important;
}

/* Expanded state for code block */
.code-block.code-block--expanded pre,
.code-block.code-block--expanded .code-block__pre {
  max-height: none !important;
}

/* Smooth sleek scrollbars */
.code-block pre::-webkit-scrollbar,
.code-block__pre::-webkit-scrollbar {
  width: 6px !important;
  height: 6px !important;
}

.code-block pre::-webkit-scrollbar-track,
.code-block__pre::-webkit-scrollbar-track {
  background: transparent !important;
}

.code-block pre::-webkit-scrollbar-thumb,
.code-block__pre::-webkit-scrollbar-thumb {
  background: var(--border) !important;
  border-radius: 4px !important;
}

.code-block pre::-webkit-scrollbar-thumb:hover,
.code-block__pre::-webkit-scrollbar-thumb:hover {
  background: var(--text-3, #9ca3af) !important;
}

/* 11. Blockquote / callout boxes */
.message__body blockquote,
.message__body .quote-block {
  margin: var(--space-5) 0 !important;
  padding: var(--space-3) var(--space-4) !important;
  background: var(--surface-2) !important;
  border-left: 3px solid var(--border) !important;
  border-radius: 0 var(--r-lg) var(--r-lg) 0 !important;
  font-style: italic !important;
  color: var(--text-2) !important;
  line-height: 1.45 !important;
}

.message__body blockquote p,
.message__body .quote-block p {
  margin: 0 !important;
  display: block !important;
}

/* 12. Inline code */
.message__body code {
  background: var(--surface) !important;
  padding: 2px 6px !important;
  border-radius: var(--r-sm) !important;
  font-family: var(--font-mono-redesign, 'JetBrains Mono', monospace) !important;
  font-size: 0.9em !important;
  color: var(--text) !important;
}

.message__body strong {
  font-weight: 600 !important;
}

/* ────────── Image Blocks with Overlay Download Buttons ────────── */
.image-block {
  margin: var(--space-5) auto !important;
  display: block !important;
  width: 100% !important;
  max-width: 100% !important;
}

.image-block__wrapper {
  position: relative !important;
  display: block !important;
  width: 100% !important;
  max-width: 100% !important;
  overflow: hidden !important;
  background: transparent !important;
  border: none !important;
  border-radius: 0 !important;
}

.image-block__wrapper img {
  display: block !important;
  width: 100% !important;
  max-width: 100% !important;
  height: auto !important;
  margin: 0 !important;
}

/* Download button overlay */
.image-block__download-btn {
  position: absolute !important;
  top: 12px !important;
  right: 12px !important;
  width: 36px !important;
  height: 36px !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  background: rgba(15, 15, 15, 0.7) !important;
  backdrop-filter: blur(4px) !important;
  -webkit-backdrop-filter: blur(4px) !important;
  color: #ffffff !important;
  border-radius: 50% !important;
  border: 1px solid rgba(255, 255, 255, 0.2) !important;
  cursor: pointer !important;
  opacity: 0 !important;
  /* Hide by default, show on hover */
  transition: opacity 0.2s ease, background 0.2s ease, transform 0.2s ease !important;
  z-index: 10 !important;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15) !important;
  text-decoration: none !important;
}

/* Hover behaviors */
.image-block__wrapper:hover .image-block__download-btn {
  opacity: 1 !important;
}

.image-block__download-btn:hover {
  background: rgba(15, 15, 15, 0.9) !important;
  transform: scale(1.05) !important;
}

.image-block__download-btn:active {
  transform: scale(0.95) !important;
}

.image-block figcaption,
.image-block__caption {
  padding: var(--space-3) var(--space-4) !important;
  font-family: var(--font-body) !important;
  font-size: 13px !important;
  font-style: italic !important;
  color: var(--text-3) !important;
  background: var(--surface) !important;
  border-top: 1px solid var(--border) !important;
  margin-top: 0 !important;
  display: block !important;
}

@media (max-width: 768px) {
  .image-block__download-btn {
    opacity: 1 !important;
  }
}

/* Inline images in markdown */
.inline-image {
  max-width: 100% !important;
  height: auto !important;
  border-radius: 8px !important;
  margin: 1rem 0 !important;
  display: block !important;
  border: 1px solid var(--border) !important;
}

/* Image group carousel styling */
.image-group-carousel {
  width: 100% !important;
  margin: 2rem 0 !important;
  position: relative !important;
}

.carousel-scroll {
  position: absolute !important;
  top: 50% !important;
  transform: translateY(-50%) !important;
  z-index: 2 !important;
  width: 36px !important;
  height: 36px !important;
  border-radius: 50% !important;
  background: var(--surface) !important;
  border: 1px solid var(--border) !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08) !important;
  cursor: pointer !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  color: var(--text-2) !important;
  transition: all 150ms ease !important;
  opacity: 0 !important;
}

.image-group-carousel:hover .carousel-scroll {
  opacity: 1 !important;
}

.carousel-scroll:hover {
  background: var(--surface-2) !important;
  color: var(--text-1) !important;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12) !important;
}

.carousel-scroll--left {
  left: -18px !important;
}

.carousel-scroll--right {
  right: -18px !important;
}

.image-group-carousel__track {
  display: flex !important;
  overflow-x: auto !important;
  gap: 16px !important;
  scroll-snap-type: x mandatory !important;
  padding: 8px 4px 16px 4px !important;
  -webkit-overflow-scrolling: touch !important;
}

.image-group-carousel__track::-webkit-scrollbar {
  height: 6px !important;
}

.image-group-carousel__track::-webkit-scrollbar-track {
  background: var(--bg-offset, #fafafa) !important;
  border-radius: 4px !important;
}

.image-group-carousel__track::-webkit-scrollbar-thumb {
  background: var(--border, #e0e0e0) !important;
  border-radius: 4px !important;
}

.image-group-carousel__item {
  flex: 0 0 320px !important;
  scroll-snap-align: start !important;
  display: flex !important;
  flex-direction: column !important;
  border: 1px solid var(--border) !important;
  border-radius: 12px !important;
  overflow: hidden !important;
  background: var(--card-bg, #ffffff) !important;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02) !important;
  transition: transform 0.2s ease, box-shadow 0.2s ease !important;
}

.image-group-carousel__item:hover {
  transform: translateY(-2px) !important;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.06) !important;
}

.image-group-carousel__item .image-block__wrapper {
  position: relative !important;
  width: 100% !important;
  height: 220px !important;
  background: var(--bg-offset, #fcfcfc) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  overflow: hidden !important;
}

.image-group-carousel__item img {
  width: 100% !important;
  height: 100% !important;
  object-fit: contain !important;
  display: block !important;
  padding: 8px !important;
}

.image-group-carousel__caption {
  padding: 10px 12px !important;
  font-family: var(--current-font) !important;
  font-size: 13px !important;
  color: var(--text-2) !important;
  border-top: 1px solid var(--border) !important;
  background: var(--bg-offset, #fafafa) !important;
  white-space: nowrap !important;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
}

@media (max-width: 600px) {
  .image-group-carousel__item {
    flex: 0 0 280px !important;
  }

  .image-group-carousel__item .image-block__wrapper {
    height: 180px !important;
  }
}

/* ─── Blog Content Typography ─────────────────────────────────────────────── */
.blog-content {
  font-size: 18px !important;
  line-height: 1.75 !important;
}

.blog-content p {
  margin: 0 0 20px !important;
}

.blog-content h2,
.blog-content .conv-heading--2 {
  font-size: 24px !important;
  line-height: 1.25 !important;
  margin: 48px 0 16px !important;
}

.blog-content h3,
.blog-content .conv-heading--3 {
  font-size: 19px !important;
  line-height: 1.35 !important;
  margin: 28px 0 12px !important;
}

.blog-content blockquote {
  margin: 24px 0 !important;
  padding: 16px 20px !important;
}

.blog-content pre {
  margin: 20px 0 !important;
  padding: 16px 20px !important;
}

.ascii-box {
  color: var(--text-3) !important;
}

/* Post Page footer and share redesign */
.post-page .share-cta,
.share-cta {
  display: flex !important;
  justify-content: space-between !important;
  align-items: center !important;
  gap: 16px !important;
  flex-wrap: wrap !important;
  margin-top: var(--space-8) !important;
  margin-bottom: var(--space-6) !important;
  padding: 24px 28px !important;
  /* More generous padding */
  border: 1px solid var(--border) !important;
  border-top: 3px solid var(--accent) !important;
  /* Accent top line draws the eye */
  background: var(--surface-2) !important;
  /* Stronger contrast than surface-1 */
  border-radius: 12px !important;
  box-sizing: border-box !important;
  width: 100% !important;
  overflow: hidden !important;
}

.post-page .share-cta__text,
.share-cta__text {
  font-family: var(--font-sans) !important;
  /* sans for UI copy */
  font-size: 15px !important;
  /* Up from 14px — more readable CTA */
  font-weight: 500 !important;
  color: var(--text-2) !important;
  margin: 0 !important;
}

.post-page .post-footer {
  display: none !important;
}

/* ── Site Header & Left Controls ── */
.site-header {
  transition: border-color 200ms ease, padding-left 250ms cubic-bezier(0.16, 1, 0.3, 1) !important;
}

@media (min-width: 1200px) {
  body.sidebar-open .site-header {
    padding-left: 260px !important;
  }
}

.site-header__left {
  display: flex !important;
  align-items: center !important;
  gap: 12px !important;
}

.site-header__left .toc-menu-btn+.site-header__user-link {
  position: relative !important;
  padding-left: 14px !important;
}

.site-header__left .toc-menu-btn+.site-header__user-link::before {
  content: "" !important;
  position: absolute !important;
  left: 0 !important;
  top: 50% !important;
  transform: translateY(-50%) !important;
  width: 1px !important;
  height: 16px !important;
  background: var(--border) !important;
}

.site-header__user-link,
a.site-header__user-link,
a.site-header__user-link:visited {
  color: var(--text, #1A1815) !important;
  text-decoration: none !important;
  opacity: 1 !important;
  display: inline-flex !important;
  align-items: center !important;
}

.site-header__user-title {
  font-family: var(--font-sans) !important;
  font-size: 15px !important;
  font-weight: 600 !important;
  color: var(--text, #1A1815) !important;
  opacity: 1 !important;
  text-decoration: none !important;
  line-height: 1.4 !important;
  white-space: nowrap !important;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
}

/* Responsive post-layout padding */
@media (max-width: 640px) {
  .post-layout {
    padding-left: 20px !important;
    padding-right: 20px !important;
  }
}

/* 1. Post layout is a simple centered block (no grid) */
.post-layout {
  display: block !important;
  max-width: 860px !important;
  margin: 0 auto !important;
  padding: var(--space-7) 40px var(--space-8) !important;
}

/* 2. TOC fixed drawer panel (Claude style) */
.toc {
  position: fixed !important;
  left: 0 !important;
  top: 0 !important;
  width: 260px !important;
  height: 100vh !important;
  background: var(--surface-1) !important;
  /* Slightly differentiated from page bg */
  border-right: 1px solid var(--border) !important;
  z-index: 100 !important;
  transform: translateX(-100%) !important;
  transition: transform 250ms cubic-bezier(0.16, 1, 0.3, 1), box-shadow 250ms ease !important;
  box-shadow: none !important;
  display: flex !important;
  flex-direction: column !important;
  padding: 0 !important;
  overflow: hidden !important;
  scrollbar-width: thin !important;
  scrollbar-color: var(--border) transparent !important;
}

/* 3. Open state */
body.sidebar-open .toc,
.toc--open {
  transform: translateX(0) !important;
  box-shadow: 4px 0 24px rgba(0, 0, 0, 0.05) !important;
}

/* Hide header sidebar button when sidebar is open */
body.sidebar-open .site-header .toc-menu-btn {
  opacity: 0 !important;
  pointer-events: none !important;
}

/* 4. Backdrop overlay (transparent — NO BLUR on main content) */
.toc-backdrop {
  position: fixed !important;
  inset: 0 !important;
  background: transparent !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  z-index: 99 !important;
  /* just below the drawer */
  opacity: 0 !important;
  pointer-events: none !important;
  transition: opacity 150ms ease !important;
}

.toc-backdrop--visible {
  opacity: 1 !important;
  pointer-events: auto !important;
}

/* 5. Menu button in header */
.toc-menu-btn {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  width: 32px !important;
  height: 32px !important;
  background: transparent !important;
  border: none !important;
  border-radius: 6px !important;
  cursor: pointer !important;
  color: var(--text) !important;
  transition: background 150ms ease, color 150ms ease, opacity 150ms ease !important;
  padding: 0 !important;
  flex-shrink: 0 !important;
}

.toc-menu-btn:hover {
  background: var(--surface-1, #f4f4f5) !important;
  color: var(--text) !important;
}

.toc-menu-btn svg {
  display: block !important;
  stroke: currentColor !important;
  transition: color 150ms ease !important;
}

/* 6. TOC header row inside drawer (matches top bar height!) */
.toc__header {
  height: 56px !important;
  min-height: 56px !important;
  max-height: 56px !important;
  box-sizing: border-box !important;
  padding: 0 16px !important;
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  border-bottom: 1px solid var(--border) !important;
  flex-shrink: 0 !important;
  margin-bottom: 0 !important;
}

/* Sidebar brand logo hover */
.toc__brand-logo {
  font-family: var(--font-sans) !important;
  font-weight: 700 !important;
  font-size: 15px !important;
  color: var(--text) !important;
  text-decoration: none !important;
  letter-spacing: -0.02em !important;
  transition: opacity 150ms ease !important;
}

.toc__brand-logo:hover {
  opacity: 0.65 !important;
}

.toc__content {
  flex: 1 !important;
  overflow-y: auto !important;
  padding: 12px 10px !important;
}

.toc__section-heading {
  font-family: var(--font-sans) !important;
  font-size: 11.5px !important;
  /* Slightly up from 11px */
  font-weight: 600 !important;
  color: var(--text-3, #9ca3af) !important;
  text-transform: uppercase !important;
  letter-spacing: 0.04em !important;
  /* Reduced from 0.06em — not as stretched */
  margin: 4px 0 10px 8px !important;
}

/* 7. Close button inside the drawer */
.toc__close-btn {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  width: 32px !important;
  height: 32px !important;
  background: transparent !important;
  border: none !important;
  border-radius: 6px !important;
  cursor: pointer !important;
  color: var(--text-2) !important;
  transition: background 150ms ease, color 150ms ease !important;
  padding: 0 !important;
}

.toc__close-btn:hover {
  background: var(--surface-1, #f4f4f5) !important;
  color: var(--text) !important;
}

.toc__list {
  list-style: none !important;
  padding: 0 !important;
  margin: 0 !important;
}

/* ── Claude-style Grouped TOC ── */
.toc__group {
  margin: 1px 0 !important;
  list-style: none !important;
}

/* Interactive row pill container */
.toc__item-row {
  display: flex !important;
  align-items: center !important;
  gap: 6px !important;
  width: 100% !important;
  border-radius: 8px !important;
  padding: 5px 8px !important;
  box-sizing: border-box !important;
  transition: background 120ms ease, color 120ms ease !important;
  cursor: pointer !important;
  user-select: none !important;
}

.toc__item-row:hover {
  background: var(--surface-1, rgba(0, 0, 0, 0.04)) !important;
}

.toc__item-row--active,
.toc__item-row:has(.toc__link--active) {
  background: var(--surface-2, rgba(0, 0, 0, 0.065)) !important;
}

[data-theme="dark"] .toc__item-row:hover,
.dark-mode .toc__item-row:hover {
  background: rgba(255, 255, 255, 0.06) !important;
}

[data-theme="dark"] .toc__item-row--active,
.dark-mode .toc__item-row--active,
[data-theme="dark"] .toc__item-row:has(.toc__link--active),
.dark-mode .toc__item-row:has(.toc__link--active) {
  background: rgba(255, 255, 255, 0.1) !important;
}

/* Chevron button (for turn with subheadings) */
.toc__chevron-btn {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  width: 16px !important;
  height: 16px !important;
  flex-shrink: 0 !important;
  background: transparent !important;
  border: none !important;
  border-radius: 4px !important;
  padding: 0 !important;
  color: var(--text-3, #9ca3af) !important;
  cursor: pointer !important;
  transition: color 120ms ease !important;
}

.toc__chevron-btn:hover {
  color: var(--text) !important;
}

.toc__chevron-icon {
  display: block !important;
  transition: transform 180ms cubic-bezier(0.4, 0, 0.2, 1) !important;
}

.toc__chevron-btn--expanded .toc__chevron-icon {
  transform: rotate(90deg) !important;
}

/* Bullet icon (for turn without subheadings) */
.toc__bullet {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  width: 16px !important;
  height: 16px !important;
  flex-shrink: 0 !important;
  color: var(--text-3, #9ca3af) !important;
}

/* Turn prompt title link */
.toc__turn-link {
  display: block !important;
  flex: 1 !important;
  min-width: 0 !important;
  font-family: var(--font-sans) !important;
  font-size: 13px !important;
  line-height: 1.4 !important;
  color: var(--text-2, #4b5563) !important;
  text-decoration: none !important;
  white-space: nowrap !important;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
  font-weight: 450 !important;
}

.toc__turn-link:hover {
  color: var(--text) !important;
}

.toc__turn-link.toc__link--active,
.toc__item-row--active .toc__turn-link {
  color: var(--text) !important;
  font-weight: 600 !important;
}

/* Collapsible sublist */
.toc__sublist {
  list-style: none !important;
  margin: 2px 0 4px 17px !important;
  padding: 2px 0 2px 8px !important;
  border-left: 1.5px solid var(--border) !important;
  overflow: hidden !important;
  transition: max-height 220ms cubic-bezier(0.4, 0, 0.2, 1),
    opacity 180ms ease !important;
  max-height: 1500px !important;
  opacity: 1 !important;
}

.toc__sublist--collapsed {
  max-height: 0 !important;
  opacity: 0 !important;
  margin: 0 0 0 17px !important;
  padding: 0 0 0 8px !important;
  pointer-events: none !important;
}

/* Subitem links */
.toc__sublink {
  display: block !important;
  padding: 4px 8px !important;
  font-family: var(--font-sans) !important;
  font-size: 12px !important;
  line-height: 1.35 !important;
  color: var(--text-3, #6b7280) !important;
  text-decoration: none !important;
  border-radius: 6px !important;
  white-space: nowrap !important;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
  transition: background 120ms ease, color 120ms ease !important;
  margin: 1px 0 !important;
}

.toc__sublink:hover {
  background: var(--surface-1, rgba(0, 0, 0, 0.04)) !important;
  color: var(--text) !important;
}

.toc__sublink--h3 {
  padding-left: 14px !important;
  font-size: 11.5px !important;
}

.toc__sublink.toc__link--active {
  background: var(--surface-2, rgba(0, 0, 0, 0.065)) !important;
  color: var(--text) !important;
  font-weight: 600 !important;
}

[data-theme="dark"] .toc__sublink:hover,
.dark-mode .toc__sublink:hover {
  background: rgba(255, 255, 255, 0.06) !important;
}

[data-theme="dark"] .toc__sublink.toc__link--active,
.dark-mode .toc__sublink.toc__link--active {
  background: rgba(255, 255, 255, 0.1) !important;
}

/* Mobile dropdown fallback */
.toc-mobile {
  display: none !important;
}

@media (max-width: 1099px) {
  .toc-mobile {
    display: block !important;
    margin-bottom: var(--space-5) !important;
    padding: var(--space-3) var(--space-4) !important;
    background: var(--surface) !important;
    border: 1px solid var(--border) !important;
    border-radius: var(--r-lg) !important;
  }

  .toc-mobile summary {
    cursor: pointer !important;
    font-weight: 500 !important;
    color: var(--text-1) !important;
    outline: none !important;
    list-style: none !important;
    /* Hide default arrow */
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
  }

  .toc-mobile summary::-webkit-details-marker {
    display: none !important;
  }

  .toc-mobile summary::after {
    content: '↓' !important;
    font-weight: 600 !important;
    color: var(--text-3) !important;
  }

  .toc-mobile[open] summary::after {
    content: '↑' !important;
  }

  .toc-mobile[open] summary {
    margin-bottom: var(--space-3) !important;
    border-bottom: 1px solid var(--border) !important;
    padding-bottom: var(--space-2) !important;
  }
}

/* Focus visible styling */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent) !important;
  outline-offset: 2px !important;
  border-radius: var(--r-sm) !important;
}

/* Lazy-load placeholder */
.image-block img {
  background: var(--surface) !important;
}

/* User Prompt Attachment Chip */
.user-attachment-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--surface, #f9fafb);
  border: 1px solid var(--border, #e5e7eb);
  border-radius: 8px;
  margin: 6px 0 10px 0;
  max-width: 100%;
  box-sizing: border-box;
}

.user-attachment-chip__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-3, #6b7280);
  flex-shrink: 0;
}

.user-attachment-chip__name {
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-1, #111827);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 320px;
}

.user-attachment-chip__badge {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-3, #6b7280);
  background: var(--surface-1, #f3f4f6);
  padding: 2px 6px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  flex-shrink: 0;
}

/* ─── Interactive Learning Visualization (GenUI / Quadratic Formula) ───────── */
.learning-viz-container {
  margin: 24px 0;
  width: 100%;
  box-sizing: border-box;
}

.learning-viz-card {
  background: var(--surface-1, #ffffff);
  color: var(--text, #0f172a);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.06);
  font-family: var(--font-sans);
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.learning-viz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: var(--surface-2, rgba(0, 0, 0, 0.02));
  border-bottom: 1px solid var(--border, #e2e8f0);
}

.learning-viz-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-2, #334155);
  letter-spacing: 0.01em;
}

.learning-viz-title svg {
  color: #0284c7;
}

.learning-viz-reset-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--bg, #ffffff);
  border: 1px solid var(--border, #e2e8f0);
  color: var(--text-2, #64748b);
  cursor: pointer;
  transition: all 0.15s ease;
}

.learning-viz-reset-btn:hover {
  background: var(--surface-2, #f1f5f9);
  color: var(--text, #0f172a);
}

.learning-viz-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 20px;
  padding: 20px;
  align-items: center;
}

@media (max-width: 768px) {
  .learning-viz-grid {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 16px;
  }
}

.learning-viz-left {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.learning-viz-formula-wrap {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.learning-viz-main-formula {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: "Cambria Math", "Times New Roman", serif;
  font-style: italic;
  font-size: 1.35rem;
  color: var(--text, #0f172a);
}

.viz-math-sym {
  font-weight: 600;
  color: #0284c7;
}

.viz-math-eq {
  font-style: normal;
  color: var(--text-3, #64748b);
}

.viz-fraction {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  vertical-align: middle;
  font-size: 1.05rem;
  line-height: 1.1;
  color: var(--text, #0f172a);
}

.viz-num {
  border-bottom: 1.5px solid var(--text, #0f172a);
  padding-bottom: 2px;
  padding-left: 4px;
  padding-right: 4px;
  text-align: center;
}

.viz-sqrt-line {
  border-top: 1.2px solid var(--text, #0f172a);
  padding-top: 1px;
}

.viz-den {
  padding-top: 2px;
  text-align: center;
}

.learning-viz-calc-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-family: "Cambria Math", "Times New Roman", serif;
  color: var(--text-2, #334155);
}

.viz-disc-expr {
  font-style: italic;
}

.viz-disc-val {
  font-weight: 600;
  color: var(--text, #0f172a);
}

.viz-disc-sign {
  font-weight: 600;
  color: #0284c7;
}

.learning-viz-roots-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.viz-root-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(2, 132, 199, 0.08);
  border: 1px solid rgba(2, 132, 199, 0.25);
  border-radius: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: "Cambria Math", "Times New Roman", serif;
  color: #0284c7;
}

.learning-viz-desc {
  font-size: 0.84rem;
  font-weight: 600;
  color: #0284c7;
  line-height: 1.4;
  transition: color 0.2s ease;
}

.learning-viz-sliders {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--surface-2, #f8fafc);
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--border, #e2e8f0);
}

.learning-viz-slider-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

.learning-viz-slider-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 55px;
  flex-shrink: 0;
}

.viz-slider-var {
  font-family: "Cambria Math", "Times New Roman", serif;
  font-style: italic;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-2, #475569);
}

.viz-slider-num {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text, #0f172a);
  font-variant-numeric: tabular-nums;
}

.learning-viz-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 6px;
  background: var(--border, #cbd5e1);
  outline: none;
  cursor: pointer;
  transition: background 0.15s;
}

.learning-viz-range:hover {
  background: #94a3b8;
}

.learning-viz-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #0284c7;
  cursor: grab;
  box-shadow: 0 2px 6px rgba(2, 132, 199, 0.35);
  transition: transform 0.1s ease;
}

.learning-viz-range::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.18);
}

.learning-viz-range::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #0284c7;
  border: none;
  cursor: grab;
  box-shadow: 0 2px 6px rgba(2, 132, 199, 0.35);
}

.learning-viz-right {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-2, #f8fafc);
  border-radius: 12px;
  border: 1px solid var(--border, #e2e8f0);
  padding: 8px;
  overflow: hidden;
}

.learning-viz-svg {
  width: 100%;
  height: auto;
  max-height: 270px;
  display: block;
}

/* Dark Theme Overrides */
[data-theme="dark"] .learning-viz-card,
[data-theme="midnight"] .learning-viz-card,
[data-theme="neon-pink"] .learning-viz-card,
[data-theme="cyber-green"] .learning-viz-card,
[data-theme="synthwave"] .learning-viz-card,
[data-theme="aurora"] .learning-viz-card,
[data-theme="lavender"] .learning-viz-card {
  background: #18191e;
  color: #f1f5f9;
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .learning-viz-header,
[data-theme="midnight"] .learning-viz-header,
[data-theme="neon-pink"] .learning-viz-header,
[data-theme="cyber-green"] .learning-viz-header,
[data-theme="synthwave"] .learning-viz-header,
[data-theme="aurora"] .learning-viz-header,
[data-theme="lavender"] .learning-viz-header {
  background: rgba(255, 255, 255, 0.03);
  border-bottom-color: rgba(255, 255, 255, 0.07);
}

[data-theme="dark"] .learning-viz-title,
[data-theme="midnight"] .learning-viz-title,
[data-theme="neon-pink"] .learning-viz-title,
[data-theme="cyber-green"] .learning-viz-title,
[data-theme="synthwave"] .learning-viz-title,
[data-theme="aurora"] .learning-viz-title,
[data-theme="lavender"] .learning-viz-title {
  color: #94a3b8;
}

[data-theme="dark"] .learning-viz-reset-btn,
[data-theme="midnight"] .learning-viz-reset-btn,
[data-theme="neon-pink"] .learning-viz-reset-btn,
[data-theme="cyber-green"] .learning-viz-reset-btn,
[data-theme="synthwave"] .learning-viz-reset-btn,
[data-theme="aurora"] .learning-viz-reset-btn,
[data-theme="lavender"] .learning-viz-reset-btn {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.08);
  color: #94a3b8;
}

[data-theme="dark"] .learning-viz-reset-btn:hover,
[data-theme="midnight"] .learning-viz-reset-btn:hover,
[data-theme="neon-pink"] .learning-viz-reset-btn:hover,
[data-theme="cyber-green"] .learning-viz-reset-btn:hover,
[data-theme="synthwave"] .learning-viz-reset-btn:hover,
[data-theme="aurora"] .learning-viz-reset-btn:hover,
[data-theme="lavender"] .learning-viz-reset-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
}

[data-theme="dark"] .learning-viz-main-formula,
[data-theme="midnight"] .learning-viz-main-formula,
[data-theme="neon-pink"] .learning-viz-main-formula,
[data-theme="cyber-green"] .learning-viz-main-formula,
[data-theme="synthwave"] .learning-viz-main-formula,
[data-theme="aurora"] .learning-viz-main-formula,
[data-theme="lavender"] .learning-viz-main-formula {
  color: #f8fafc;
}

[data-theme="dark"] .viz-num,
[data-theme="midnight"] .viz-num,
[data-theme="neon-pink"] .viz-num,
[data-theme="cyber-green"] .viz-num,
[data-theme="synthwave"] .viz-num,
[data-theme="aurora"] .viz-num,
[data-theme="lavender"] .viz-num {
  border-bottom-color: rgba(255, 255, 255, 0.8);
}

[data-theme="dark"] .viz-sqrt-line,
[data-theme="midnight"] .viz-sqrt-line,
[data-theme="neon-pink"] .viz-sqrt-line,
[data-theme="cyber-green"] .viz-sqrt-line,
[data-theme="synthwave"] .viz-sqrt-line,
[data-theme="aurora"] .viz-sqrt-line,
[data-theme="lavender"] .viz-sqrt-line {
  border-top-color: rgba(255, 255, 255, 0.7);
}

[data-theme="dark"] .learning-viz-calc-row,
[data-theme="midnight"] .learning-viz-calc-row,
[data-theme="neon-pink"] .learning-viz-calc-row,
[data-theme="cyber-green"] .learning-viz-calc-row,
[data-theme="synthwave"] .learning-viz-calc-row,
[data-theme="aurora"] .learning-viz-calc-row,
[data-theme="lavender"] .learning-viz-calc-row {
  color: #cbd5e1;
}

[data-theme="dark"] .viz-disc-val,
[data-theme="midnight"] .viz-disc-val,
[data-theme="neon-pink"] .viz-disc-val,
[data-theme="cyber-green"] .viz-disc-val,
[data-theme="synthwave"] .viz-disc-val,
[data-theme="aurora"] .viz-disc-val,
[data-theme="lavender"] .viz-disc-val {
  color: #f1f5f9;
}

[data-theme="dark"] .learning-viz-sliders,
[data-theme="midnight"] .learning-viz-sliders,
[data-theme="neon-pink"] .learning-viz-sliders,
[data-theme="cyber-green"] .learning-viz-sliders,
[data-theme="synthwave"] .learning-viz-sliders,
[data-theme="aurora"] .learning-viz-sliders,
[data-theme="lavender"] .learning-viz-sliders {
  background: rgba(0, 0, 0, 0.2);
  border-color: rgba(255, 255, 255, 0.04);
}

[data-theme="dark"] .learning-viz-slider-var,
[data-theme="midnight"] .learning-viz-slider-var,
[data-theme="neon-pink"] .learning-viz-slider-var,
[data-theme="cyber-green"] .learning-viz-slider-var,
[data-theme="synthwave"] .learning-viz-slider-var,
[data-theme="aurora"] .learning-viz-slider-var,
[data-theme="lavender"] .learning-viz-slider-var {
  color: #94a3b8;
}

[data-theme="dark"] .learning-viz-slider-num,
[data-theme="midnight"] .learning-viz-slider-num,
[data-theme="neon-pink"] .learning-viz-slider-num,
[data-theme="cyber-green"] .learning-viz-slider-num,
[data-theme="synthwave"] .learning-viz-slider-num,
[data-theme="aurora"] .learning-viz-slider-num,
[data-theme="lavender"] .learning-viz-slider-num {
  color: #f1f5f9;
}

[data-theme="dark"] .learning-viz-range,
[data-theme="midnight"] .learning-viz-range,
[data-theme="neon-pink"] .learning-viz-range,
[data-theme="cyber-green"] .learning-viz-range,
[data-theme="synthwave"] .learning-viz-range,
[data-theme="aurora"] .learning-viz-range,
[data-theme="lavender"] .learning-viz-range {
  background: rgba(255, 255, 255, 0.12);
}

[data-theme="dark"] .learning-viz-range::-webkit-slider-thumb,
[data-theme="midnight"] .learning-viz-range::-webkit-slider-thumb,
[data-theme="neon-pink"] .learning-viz-range::-webkit-slider-thumb,
[data-theme="cyber-green"] .learning-viz-range::-webkit-slider-thumb,
[data-theme="synthwave"] .learning-viz-range::-webkit-slider-thumb,
[data-theme="aurora"] .learning-viz-range::-webkit-slider-thumb,
[data-theme="lavender"] .learning-viz-range::-webkit-slider-thumb {
  background: #ffffff;
}

[data-theme="dark"] .learning-viz-right,
[data-theme="midnight"] .learning-viz-right,
[data-theme="neon-pink"] .learning-viz-right,
[data-theme="cyber-green"] .learning-viz-right,
[data-theme="synthwave"] .learning-viz-right,
[data-theme="aurora"] .learning-viz-right,
[data-theme="lavender"] .learning-viz-right {
  background: #111216;
  border-color: rgba(255, 255, 255, 0.05);
}

/* ─── ChatGPT Native Chart Card ─────────────────────────────── */
.chatstack-chart-card {
  margin: 1.25rem 0;
  padding: 1.5rem 1.75rem;
  background: var(--surface, #ffffff);
  border: 1px solid var(--border, rgba(0, 0, 0, 0.08));
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  max-width: 100%;
  transition: all 0.2s ease;
}

[data-theme="dark"] .chatstack-chart-card,
[data-theme="midnight"] .chatstack-chart-card,
[data-theme="neon-pink"] .chatstack-chart-card,
[data-theme="cyber-green"] .chatstack-chart-card,
[data-theme="synthwave"] .chatstack-chart-card,
[data-theme="aurora"] .chatstack-chart-card,
[data-theme="lavender"] .chatstack-chart-card {
  background: #111216;
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

.chatstack-chart-header {
  margin-bottom: 1.5rem;
}

.chatstack-chart-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text, #111827);
  letter-spacing: -0.015em;
  margin-bottom: 0.25rem;
}

.chatstack-chart-desc {
  font-size: 0.88rem;
  color: var(--text-2, #6b7280);
  line-height: 1.4;
}

.chatstack-chart-body {
  position: relative;
  height: 320px;
  width: 100%;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}