/* Knowledge Platform — Design Tokens
   Inspired by Apple design system: precision editorial, neutral canvases, blue actions.
   Adapted for a global knowledge subscription product.
   Supports: light, dark, and auto (system preference) themes. */

/* === Light Theme (default) === */
:root {
  /* Neutral foundation */
  --bg:       #ffffff;
  --bg-elevated: #f5f5f7;
  --bg-elevated-2: #fafafa;
  --surface:  #ffffff;
  --surface-secondary: #fafafa;

  /* Text */
  --fg:       #1d1d1f;
  --fg-secondary: #6e6e73;
  --fg-tertiary: #86868b;
  --fg-inverse: #ffffff;

  /* Borders */
  --border:   #d2d2d7;
  --border-strong: #86868b;

  /* Action blue */
  --accent:   #0071e3;
  --accent-hover: #0077ed;
  --accent-light: rgba(0, 113, 227, 0.1);
  --accent-light-2: rgba(0, 113, 227, 0.06);

  /* Status colors */
  --success:  #30d158;
  --success-light: rgba(48, 209, 88, 0.12);
  --success-bg: rgba(48, 209, 88, 0.12);
  --warning:  #ff9f0a;
  --warning-bg: rgba(255, 159, 10, 0.12);
  --error:    #ff453a;
  --danger:   #ff453a;
  --error-bg: rgba(255, 69, 58, 0.12);
  --info:     #5ac8fa;
  --info-bg: rgba(90, 200, 250, 0.12);

  /* Category colors */
  --cat-ai:     #0071e3;
  --cat-ai-bg:  rgba(0,113,227,0.1);
  --cat-startup: #30d158;
  --cat-startup-bg: rgba(48,209,88,0.1);
  --cat-marketing: #ff9f0a;
  --cat-marketing-bg: rgba(255,159,10,0.1);
  --cat-programming: #bf5af2;
  --cat-programming-bg: rgba(191,90,242,0.1);
  --cat-design: #ff375f;
  --cat-design-bg: rgba(255,55,95,0.1);
  --cat-business: #64d2ff;
  --cat-business-bg: rgba(100,210,255,0.1);

  /* Tertiary background (for pill/tab containers) */
  --bg-tertiary: #f0f0f2;

  /* Chrome (sidebar, nav, player backgrounds) */
  --chrome-bg: rgba(255, 255, 255, 0.82);
  --chrome-sidebar-grad-start: #fafafa;
  --chrome-sidebar-grad-end: #f5f5f7;
  --chrome-border: var(--border);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.16);
  --shadow-player: 0 -2px 12px rgba(0,0,0,0.06);

  /* Overlay */
  --overlay-bg: rgba(0,0,0,0.4);

  /* Modal gradient background */
  --modal-overlay-bg: rgba(0,0,0,0.4);

  /* Hot badge */
  --hot-bg: #fef3c7;
  --hot-fg: #92400e;

  /* Paywall toast */
  --toast-bg: var(--fg);
  --toast-fg: var(--bg);

  /* Feedback sidebar */
  --feedback-border: var(--border);
  --feedback-hover-bg: rgba(0,113,227,0.04);

  /* Scrollbar */
  --scrollbar-thumb: var(--border);

  /* Carousel dots */
  --carousel-dot-bg: rgba(255,255,255,0.35);
  --carousel-dot-active: #fff;
  --carousel-arrow-bg: rgba(255,255,255,0.15);
  --carousel-arrow-border: rgba(255,255,255,0.2);
  --carousel-arrow-hover: rgba(255,255,255,0.3);

  /* Topic cover gradient defaults */
  --topic-gradient: linear-gradient(135deg, var(--bg-elevated), var(--bg-elevated-2));

  /* Locked chapter */
  --locked-blur: rgba(255,255,255,0.6);

  /* Icon wrap */
  --icon-wrap-bg: var(--bg-elevated);
  --icon-wrap-fg: var(--fg-tertiary);

  /* Sidebar active */
  --sidebar-active-bg: #ffffff;
  --sidebar-active-fg: var(--fg);
  --sidebar-active-indicator: var(--accent);
  --sidebar-hover-bg: rgba(255,255,255,0.7);

  /* Player */
  --player-bg: var(--surface);
  --player-border: var(--border);
  --player-shadow: var(--shadow-player);
  --player-thumb-bg: var(--bg-elevated);
  --player-thumb-fg: var(--fg-tertiary);
  --player-btn-hover: var(--bg-elevated);
}

/* === Dark Theme === */
[data-theme="dark"] {
  /* Neutral foundation — soft dark, not pure black (Linear/Vercel reference) */
  --bg:       #0a0a0b;
  --bg-elevated: #161618;
  --bg-elevated-2: #1c1c1e;
  --surface:  #161618;
  --surface-secondary: #1c1c1e;

  --fg:       #f0f0f5;
  --fg-secondary: #b0b0b8;
  --fg-tertiary: #78787e;
  --fg-inverse: #ffffff;  /* stays white — always used on dark/colored backgrounds */

  --border:   #252528;
  --border-strong: #38383c;

  --accent:   #2997ff;
  --accent-hover: #40a3ff;
  --accent-light: rgba(41, 151, 255, 0.15);
  --accent-light-2: rgba(41, 151, 255, 0.08);

  --success:  #30d158;
  --success-light: rgba(48, 209, 88, 0.15);
  --success-bg: rgba(48, 209, 88, 0.15);
  --warning:  #ff9f0a;
  --warning-bg: rgba(255, 159, 10, 0.15);
  --error:    #ff453a;
  --danger:   #ff453a;
  --error-bg: rgba(255, 69, 58, 0.15);
  --info:     #5ac8fa;
  --info-bg: rgba(90, 200, 250, 0.15);

  --cat-ai:     #2997ff;
  --cat-ai-bg:  rgba(41,151,255,0.12);
  --cat-startup: #30d158;
  --cat-startup-bg: rgba(48,209,88,0.12);
  --cat-marketing: #ffb340;
  --cat-marketing-bg: rgba(255,159,10,0.12);
  --cat-programming: #d4a0ff;
  --cat-programming-bg: rgba(191,90,242,0.12);
  --cat-design: #ff6482;
  --cat-design-bg: rgba(255,55,95,0.12);
  --cat-business: #64d2ff;
  --cat-business-bg: rgba(100,210,255,0.12);

  /* Tertiary background (dark) */
  --bg-tertiary: #1e1e20;

  /* Chrome (dark) — translucent dark frosted glass */
  --chrome-bg: rgba(10, 10, 10, 0.82);
  --chrome-sidebar-grad-start: #0a0a0a;
  --chrome-sidebar-grad-end: #050505;
  --chrome-border: var(--border);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.6);
  --shadow-player: 0 -2px 12px rgba(0,0,0,0.4);

  --overlay-bg: rgba(0,0,0,0.7);
  --modal-overlay-bg: rgba(0,0,0,0.7);

  --hot-bg: rgba(255,159,10,0.15);
  --hot-fg: #ffb340;

  --toast-bg: var(--bg-elevated-2);
  --toast-fg: var(--fg);

  --feedback-border: var(--border);
  --feedback-hover-bg: rgba(41,151,255,0.08);

  --scrollbar-thumb: var(--border);

  --carousel-dot-bg: rgba(255,255,255,0.25);
  --carousel-dot-active: rgba(255,255,255,0.9);
  --carousel-arrow-bg: rgba(255,255,255,0.1);
  --carousel-arrow-border: rgba(255,255,255,0.15);
  --carousel-arrow-hover: rgba(255,255,255,0.2);

  --topic-gradient: linear-gradient(135deg, var(--bg-elevated), var(--bg-elevated-2));

  --locked-blur: rgba(10,10,10,0.6);

  --icon-wrap-bg: var(--bg-elevated-2);
  --icon-wrap-fg: var(--fg-secondary);

  --sidebar-active-bg: #1e1e20;
  --sidebar-active-fg: var(--fg);
  --sidebar-active-indicator: var(--accent);
  --sidebar-hover-bg: rgba(255,255,255,0.04);

  --player-bg: var(--surface);
  --player-border: var(--border);
  --player-shadow: var(--shadow-player);
  --player-thumb-bg: var(--bg-elevated-2);
  --player-thumb-fg: var(--fg-secondary);
  --player-btn-hover: var(--bg-elevated);
}

/* === Reader (eye-care green) Theme ===
   Tokens mirror code/deepmox/src/styles/tokens/theme.css [data-theme="reader"].
   Pale-green base + deep forest green text + #2f6f55 accent — calibrated
   for long-form reading on screens (low blue-light vs standard light/dark). */
[data-theme="reader"] {
  --bg:        #f4f7f1;
  --bg-elevated: #eaf0e6;
  --bg-elevated-2: #f8faf6;
  --surface:   #fbfcf8;
  --surface-secondary: #f0f5ec;

  --fg:        #202823;
  --fg-secondary: #536159;
  --fg-tertiary: #78867c;
  --fg-inverse: #ffffff;

  --border:    #cfdbd1;
  --border-strong: #9fb0a2;

  --accent:    #2f6f55;
  --accent-hover: #255f48;
  --accent-light: rgba(47, 111, 85, 0.12);
  --accent-light-2: rgba(47, 111, 85, 0.07);

  --success:   #23865c;
  --success-light: rgba(35, 134, 92, 0.15);
  --success-bg: rgba(35, 134, 92, 0.12);
  --warning:   #a66a18;
  --warning-bg: rgba(166, 106, 24, 0.12);
  --error:     #b9433b;
  --danger:    #b9433b;
  --error-bg:  rgba(185, 67, 59, 0.12);
  --info:      #3d7d92;
  --info-bg:   rgba(61, 125, 146, 0.12);

  --cat-ai:    #2f6f55;
  --cat-ai-bg: rgba(47, 111, 85, 0.14);
  --cat-startup: #23865c;
  --cat-startup-bg: rgba(35, 134, 92, 0.12);
  --cat-marketing: #a66a18;
  --cat-marketing-bg: rgba(166, 106, 24, 0.12);
  --cat-programming: #7758a6;
  --cat-programming-bg: rgba(119, 88, 166, 0.12);
  --cat-design: #aa536a;
  --cat-design-bg: rgba(170, 83, 106, 0.12);
  --cat-business: #3d7d92;
  --cat-business-bg: rgba(61, 125, 146, 0.12);

  --bg-tertiary: #e1eadf;

  /* Chrome (reader) — translucent pale-green frosted glass */
  --chrome-bg: rgba(244, 247, 241, 0.86);
  --chrome-sidebar-grad-start: #f8faf6;
  --chrome-sidebar-grad-end:   #eaf0e6;
  --chrome-border: color-mix(in srgb, var(--border) 82%, transparent);

  --shadow-sm: 0 1px 3px rgba(38, 55, 44, 0.08);
  --shadow-md: 0 4px 12px rgba(38, 55, 44, 0.10);
  --shadow-lg: 0 8px 24px rgba(38, 55, 44, 0.12);
  --shadow-xl: 0 16px 48px rgba(38, 55, 44, 0.14);
  --shadow-player: 0 -2px 12px rgba(38, 55, 44, 0.10);

  --overlay-bg: rgba(32, 40, 35, 0.38);
  --modal-overlay-bg: rgba(32, 40, 35, 0.42);

  --hot-bg:    #f2e9cf;
  --hot-fg:    #7a5014;

  --toast-bg:  #202823;
  --toast-fg:  #fbfcf8;

  --skeleton-base:  #e2eadf;
  --skeleton-line:  #cbd8cd;
  --skeleton-shine: rgba(255, 255, 255, 0.62);
  --locked-blur:    rgba(244, 247, 241, 0.68);

  --scrollbar-thumb: #b8c7bb;
  --scrollbar-track: rgba(0, 0, 0, 0.04);

  --sidebar-active-bg: #fbfcf8;
  --sidebar-active-fg: #202823;
  --sidebar-active-indicator: #2f6f55;
  --sidebar-hover-bg: rgba(255, 255, 255, 0.66);

  --icon-wrap-bg: var(--bg-elevated);
  --icon-wrap-fg: var(--fg-tertiary);

  --player-bg: var(--bg-elevated-2);
  --player-fg: var(--fg);
  --player-border: var(--border);
  --player-shadow: var(--shadow-player);
  --player-thumb-bg: var(--bg-elevated-2);
  --player-thumb-fg: var(--fg-secondary);
  --player-btn-hover: var(--bg-elevated);
}

/* === Typography === */
:root {
  --font-display: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Icons', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-body:    -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'SF Pro Icons', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono:    'SF Mono', 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, Menlo, monospace;

  /* Spacing */
  --space-2:  2px;
  --space-4:  4px;
  --space-6:  6px;
  --space-8:  8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;
  --space-40: 40px;
  --space-48: 48px;
  --space-64: 64px;

  /* Radius */
  --radius-sm:   5px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-2xl:  18px;
  --radius-3xl:  28px;
  --radius-pill: 980px;

  /* Transitions */
  --ease-out: cubic-bezier(0.25, 0.1, 0.25, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;

  /* Layout */
  --max-content: 1200px;
  --max-narrow: 680px;
  --nav-height: 52px;
  --player-height: 64px;
  --sidebar-width: 240px;
}

/* === Base Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--fg);
  background: var(--bg);
  line-height: 1.47;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--duration-normal) var(--ease-out),
              color var(--duration-normal) var(--ease-out);
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select, textarea { font-family: inherit; font-size: inherit; }
ul, ol { list-style: none; }

/* === Typography Scale === */
.hero-xl   { font-family: var(--font-display); font-size: clamp(40px, 6vw, 80px); font-weight: 600; line-height: 1.05; letter-spacing: -1.2px; }
.hero-lg   { font-family: var(--font-display); font-size: clamp(32px, 4vw, 56px); font-weight: 600; line-height: 1.07; letter-spacing: -0.5px; }
.section   { font-family: var(--font-display); font-size: clamp(28px, 3vw, 48px); font-weight: 600; line-height: 1.08; letter-spacing: -0.3px; }
.heading-1 { font-family: var(--font-display); font-size: clamp(24px, 2.5vw, 40px); font-weight: 600; line-height: 1.1; }
.heading-2 { font-family: var(--font-display); font-size: clamp(20px, 2vw, 32px); font-weight: 600; line-height: 1.15; }
.heading-3 { font-family: var(--font-display); font-size: 24px; font-weight: 600; line-height: 1.17; letter-spacing: -0.2px; }
.heading-4 { font-family: var(--font-display); font-size: 21px; font-weight: 600; line-height: 1.2; }
.body-lg   { font-size: 19px; font-weight: 400; line-height: 1.42; }
.body      { font-size: 17px; font-weight: 400; line-height: 1.47; letter-spacing: -0.2px; }
.body-sm   { font-size: 14px; font-weight: 400; line-height: 1.43; }
.body-xs   { font-size: 12px; font-weight: 400; line-height: 1.33; }
.label     { font-size: 14px; font-weight: 600; }
.mono      { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* === Buttons === */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 8px 16px; border-radius: var(--radius-pill);
  font-weight: 600; font-size: 14px; line-height: 1.29;
  transition: all var(--duration-fast) var(--ease-out);
  min-height: 36px; gap: 6px;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-dark    { background: var(--fg); color: var(--bg); }
.btn-dark:hover { opacity: 0.85; }
.btn-outline { border: 1.5px solid var(--border); color: var(--fg); background: var(--surface); }
.btn-outline:hover { border-color: var(--border-strong); }
.btn-ghost   { color: var(--fg); }
.btn-ghost:hover { background: var(--bg-elevated); }
.btn-lg      { padding: 12px 24px; font-size: 17px; min-height: 44px; }
.btn-sm      { padding: 4px 12px; font-size: 12px; min-height: 28px; }
.btn-icon    { width: 36px; height: 36px; padding: 0; border-radius: 50%; }

/* === Cards === */
.card {
  background: var(--surface); border-radius: var(--radius-xl);
  border: 1px solid var(--border); overflow: hidden;
  transition: box-shadow var(--duration-normal) var(--ease-out),
              background var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
}
.card:hover { box-shadow: var(--shadow-md); }
.card-flat  { border: none; background: var(--bg-elevated); }

/* === Inputs === */
.input {
  width: 100%; padding: 10px 14px; border-radius: var(--radius-md);
  border: 1.5px solid var(--border-strong); background: var(--surface);
  color: var(--fg); font-size: 17px; line-height: 1.24;
  transition: border-color var(--duration-fast) var(--ease-out),
              background var(--duration-normal) var(--ease-out);
}
.input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-light); }
.input::placeholder { color: var(--fg-tertiary); }

/* === Status Pills === */
.pill {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border-radius: var(--radius-pill);
  font-size: 12px; font-weight: 600; line-height: 1.33;
}
.pill-pending  { background: var(--warning-bg); color: var(--warning); }
.pill-adopted  { background: var(--info-bg); color: var(--accent); }
.pill-progress { background: var(--accent-light); color: var(--accent); }
.pill-live     { background: var(--success-bg); color: var(--success); }
.pill-rejected { background: var(--error-bg); color: var(--error); }
.pill-free     { background: var(--success-bg); color: var(--success); }
.pill-new      { background: var(--warning-bg); color: var(--warning); }
.pill-category { background: var(--bg-elevated); color: var(--fg-secondary); border: 1px solid var(--border); font-size: 11px; padding: 2px 8px; border-radius: var(--radius-pill); }

/* === Nav === */
.top-nav {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-height);
  background: var(--chrome-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 0.5px solid var(--chrome-border);
  box-shadow: 0 0.5px 0 rgba(0,0,0,0.02), 0 2px 8px rgba(0,0,0,0.03);
  display: flex; align-items: center; padding: 0 var(--space-24);
  transition: background var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
}
[data-theme="dark"] .top-nav {
  box-shadow: 0 0.5px 0 rgba(255,255,255,0.03), 0 2px 12px rgba(0,0,0,0.3);
}
.top-nav .nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; max-width: var(--max-content); margin: 0 auto;
}
.nav-link {
  font-size: 12px; font-weight: 400; color: var(--fg-secondary);
  transition: color var(--duration-fast); padding: 0 12px;
}
.nav-link:hover, .nav-link.active { color: var(--fg); }

/* === Utility === */
.container { max-width: var(--max-content); margin: 0 auto; padding: 0 var(--space-24); }
.container-narrow { max-width: var(--max-narrow); margin: 0 auto; padding: 0 var(--space-24); }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-8 { gap: var(--space-8); }
.gap-12 { gap: var(--space-12); }
.gap-16 { gap: var(--space-16); }
.gap-24 { gap: var(--space-24); }
.gap-32 { gap: var(--space-32); }
.text-center { text-align: center; }
.text-muted { color: var(--fg-secondary); }
.text-xs { font-size: 12px; }
.text-sm { font-size: 14px; }
.mt-16 { margin-top: var(--space-16); }
.mt-24 { margin-top: var(--space-24); }
.mt-32 { margin-top: var(--space-32); }
.mt-48 { margin-top: var(--space-48); }
.mt-64 { margin-top: var(--space-64); }
.mb-16 { margin-bottom: var(--space-16); }
.mb-24 { margin-bottom: var(--space-24); }
.p-24 { padding: var(--space-24); }
.w-full { width: 100%; }
.rounded-xl { border-radius: var(--radius-xl); }
.overflow-hidden { overflow: hidden; }

/* === Tab Navigation (App) === */
.tab-nav {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 100;
  background: var(--chrome-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-top: 1px solid var(--chrome-border);
  display: flex; height: 56px; padding-bottom: env(safe-area-inset-bottom, 0);
  transition: background var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
}
.tab-item {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 2px; font-size: 10px; font-weight: 500;
  color: var(--fg-tertiary); transition: color var(--duration-fast);
}
.tab-item.active { color: var(--accent); }
.tab-item svg { width: 24px; height: 24px; }

/* === Global Player Bar === */
.player-bar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 90;
  background: var(--player-bg); border-top: 1px solid var(--player-border);
  box-shadow: var(--player-shadow);
  height: var(--player-height); display: flex; align-items: center;
  padding: 0 var(--space-16);
  transition: transform var(--duration-normal) var(--ease-out),
              background var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
}
.player-bar.minimized { transform: translateY(calc(100% - 48px)); }
.player-bar .player-info { display: flex; align-items: center; gap: 12px; flex: 1; min-width: 0; }
.player-bar .player-thumb {
  width: 40px; height: 40px; border-radius: var(--radius-md);
  background: var(--player-thumb-bg); flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; color: var(--player-thumb-fg);
}
.player-bar .player-meta { min-width: 0; }
.player-bar .player-title {
  font-size: 14px; font-weight: 600; white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis;
}
.player-bar .player-sub {
  font-size: 12px; color: var(--fg-secondary); white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis;
}
.player-bar .player-controls { display: flex; align-items: center; gap: 8px; }
.player-bar .player-btn {
  width: 36px; height: 36px; border-radius: 50%; display: flex;
  align-items: center; justify-content: center; color: var(--fg);
}
.player-bar .player-btn:hover { background: var(--player-btn-hover); }
.player-bar .player-btn.play { width: 40px; height: 40px; background: var(--accent); color: #fff; }
.player-bar .player-progress {
  position: absolute; top: -2px; left: 0; right: 0; height: 4px;
  background: var(--bg-elevated); cursor: pointer;
}
.player-bar .player-progress-fill {
  height: 100%; background: var(--accent); width: 35%;
  border-radius: 2px; transition: width 0.3s linear;
}

/* === Modal / Overlay === */
.modal-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: var(--modal-overlay-bg); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-out);
}
.modal-overlay.active { opacity: 1; pointer-events: auto; }
.modal {
  background: var(--surface); border-radius: var(--radius-2xl);
  max-width: 480px; width: 90%; max-height: 92vh; overflow-y: auto;
  box-shadow: var(--shadow-xl); transform: translateY(20px) scale(0.97);
  transition: transform var(--duration-normal) var(--ease-out),
              background var(--duration-normal) var(--ease-out);
}
.modal-overlay.active .modal { transform: translateY(0) scale(1); }
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-20) var(--space-24);
  border-bottom: 1px solid var(--border);
}
.modal-body { padding: var(--space-24); }

/* === Theme Toggle in Nav === */
.theme-toggle {
  display: inline-flex; align-items: center; gap: 2px;
  padding: 4px; border-radius: var(--radius-pill);
  background: var(--bg-elevated); border: 1px solid var(--border);
}
.theme-toggle button {
  width: 28px; height: 28px; border-radius: var(--radius-pill);
  display: flex; align-items: center; justify-content: center;
  color: var(--fg-tertiary); transition: all var(--duration-fast);
}
.theme-toggle button:hover { color: var(--fg); }
.theme-toggle button.active {
  background: var(--surface); color: var(--fg);
  box-shadow: var(--shadow-sm);
}
.theme-toggle svg { width: 14px; height: 14px; }

/* === Scrollbar Suppression === */
* {
  scrollbar-width: none;
  -ms-overflow-style: none;
}
*::-webkit-scrollbar { display: none; }

/* === Responsive === */
@media (max-width: 768px) {
  .container { padding: 0 var(--space-16); }
  .hero-xl { font-size: clamp(28px, 8vw, 40px); }
  .hero-lg { font-size: clamp(24px, 6vw, 32px); }
  .section { font-size: clamp(22px, 5vw, 28px); }
  .heading-1 { font-size: 24px; }
  .heading-2 { font-size: 20px; }
}

@media (max-width: 430px) {
  .container { padding: 0 var(--space-12); }
  :root { --nav-height: 44px; }
}