/* =========================================================================
   LingoLoop — English Listening Practice
   Design System & Component Stylesheet
   Aesthetic: Editorial-youthful. Warm coral + chartreuse on cream,
   deep aubergine dark mode. Intentionally NOT the purple-blue neon slop.
   ========================================================================= */

/* ---------- Design Tokens ---------- */
:root {
  /* Color — Light (warm editorial) */
  --bg: oklch(98% 0.012 80);
  --bg-grad: radial-gradient(1200px 600px at 12% -8%, oklch(94% 0.06 60 / 0.55), transparent 60%),
             radial-gradient(900px 500px at 100% 0%, oklch(92% 0.07 130 / 0.40), transparent 55%);
  --surface: oklch(100% 0 0);
  --surface-2: oklch(96.5% 0.012 80);
  --surface-3: oklch(93% 0.02 80);
  --ink: oklch(26% 0.03 60);
  --ink-soft: oklch(46% 0.02 60);
  --ink-faint: oklch(62% 0.015 70);
  --line: oklch(90% 0.015 80);
  --line-strong: oklch(83% 0.02 75);

  --primary: oklch(64% 0.205 28);      /* coral / red-orange */
  --primary-press: oklch(57% 0.21 28);
  --primary-soft: oklch(95% 0.05 35);
  --on-primary: oklch(100% 0 0);

  --accent: oklch(84% 0.17 128);       /* chartreuse */
  --accent-soft: oklch(96% 0.07 125);
  --secondary: oklch(58% 0.12 222);    /* calm teal-blue */
  --secondary-soft: oklch(95% 0.04 220);

  --success: oklch(66% 0.15 150);
  --warning: oklch(76% 0.15 75);
  --danger: oklch(60% 0.21 25);
  --info: oklch(62% 0.13 230);

  --ring: oklch(64% 0.205 28 / 0.45);

  /* Typography */
  --font-display: "Bricolage Grotesque", "Space Grotesk", system-ui, sans-serif;
  --font-ui: "Space Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-cjk: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", var(--font-ui);
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;

  --fs-xs: 0.78rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.0625rem;
  --fs-lg: clamp(1.2rem, 1.05rem + 0.6vw, 1.5rem);
  --fs-xl: clamp(1.6rem, 1.25rem + 1.4vw, 2.25rem);
  --fs-2xl: clamp(2.1rem, 1.5rem + 2.6vw, 3.4rem);
  --fs-3xl: clamp(2.8rem, 1.8rem + 4vw, 4.6rem);

  --lh-tight: 1.1;
  --lh-snug: 1.3;
  --lh-normal: 1.6;

  /* Spacing (8pt base, fluid) */
  --s-1: 0.25rem;
  --s-2: 0.5rem;
  --s-3: 0.75rem;
  --s-4: 1rem;
  --s-5: 1.25rem;
  --s-6: 1.5rem;
  --s-8: 2rem;
  --s-10: 2.5rem;
  --s-12: clamp(3rem, 2rem + 3vw, 4.5rem);
  --s-16: clamp(4rem, 2.5rem + 5vw, 7rem);

  /* Radius */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 34px;
  --r-pill: 999px;

  /* Shadow (soft, lightly tinted) */
  --sh-1: 0 1px 2px oklch(26% 0.03 60 / 0.06), 0 2px 6px oklch(26% 0.03 60 / 0.05);
  --sh-2: 0 6px 18px oklch(26% 0.03 60 / 0.09), 0 2px 6px oklch(26% 0.03 60 / 0.06);
  --sh-3: 0 18px 50px oklch(26% 0.03 60 / 0.14), 0 6px 16px oklch(26% 0.03 60 / 0.08);
  --sh-pop: 0 24px 70px oklch(20% 0.04 300 / 0.30);

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);     /* ease-out-quart */
  --ease-expo: cubic-bezier(0.16, 1, 0.3, 1);     /* expo */
  --t-fast: 140ms;
  --t-med: 280ms;
  --t-slow: 460ms;

  --maxw: 1180px;
  --nav-h: 64px;
}

[data-theme="dark"] {
  --bg: oklch(21% 0.025 300);
  --bg-grad: radial-gradient(1100px 600px at 10% -10%, oklch(30% 0.07 350 / 0.5), transparent 60%),
             radial-gradient(900px 500px at 100% 0%, oklch(28% 0.08 150 / 0.35), transparent 55%);
  --surface: oklch(26% 0.028 300);
  --surface-2: oklch(30% 0.03 300);
  --surface-3: oklch(35% 0.03 300);
  --ink: oklch(95% 0.01 300);
  --ink-soft: oklch(76% 0.02 300);
  --ink-faint: oklch(62% 0.02 300);
  --line: oklch(38% 0.03 300);
  --line-strong: oklch(46% 0.03 300);

  --primary: oklch(71% 0.19 28);
  --primary-press: oklch(64% 0.20 28);
  --primary-soft: oklch(34% 0.08 28);
  --on-primary: oklch(18% 0.02 300);

  --accent: oklch(86% 0.16 125);
  --accent-soft: oklch(34% 0.07 130);
  --secondary: oklch(68% 0.11 222);
  --secondary-soft: oklch(32% 0.06 220);

  --success: oklch(74% 0.14 150);
  --warning: oklch(82% 0.13 80);
  --danger: oklch(68% 0.19 25);
  --info: oklch(72% 0.12 230);

  --ring: oklch(71% 0.19 28 / 0.5);
  --sh-1: 0 1px 2px oklch(0% 0 0 / 0.3), 0 2px 6px oklch(0% 0 0 / 0.25);
  --sh-2: 0 6px 18px oklch(0% 0 0 / 0.35), 0 2px 6px oklch(0% 0 0 / 0.25);
  --sh-3: 0 18px 50px oklch(0% 0 0 / 0.45), 0 6px 16px oklch(0% 0 0 / 0.3);
  --sh-pop: 0 24px 70px oklch(0% 0 0 / 0.55);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-cjk);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--ink);
  background: var(--bg);
  background-image: var(--bg-grad);
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color var(--t-med) var(--ease-out), color var(--t-med) var(--ease-out);
}
img, video, svg { display: block; max-width: 100%; }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; padding: 0; }
:focus-visible { outline: 3px solid var(--ring); outline-offset: 2px; border-radius: 4px; }
::selection { background: var(--accent); color: var(--ink); }

/* ---------- Layout helpers ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(1rem, 0.6rem + 2vw, 2.5rem); }
.section { padding-block: var(--s-12); }
.eyebrow {
  font-family: var(--font-ui);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--primary);
  display: inline-flex; align-items: center; gap: var(--s-2);
}
.eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--primary); border-radius: 2px; }
.gradient-text {
  background: linear-gradient(100deg, var(--primary), oklch(70% 0.16 350), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.muted { color: var(--ink-soft); }
.faint { color: var(--ink-faint); }

/* ---------- Buttons ---------- */
.btn {
  --b: var(--surface);
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2);
  font-family: var(--font-ui); font-weight: 600; font-size: var(--fs-sm);
  padding: 0.7rem 1.15rem; min-height: 44px;
  border-radius: var(--r-pill);
  background: var(--b); color: var(--ink);
  border: 1.5px solid var(--line-strong);
  transition: transform var(--t-fast) var(--ease-out), box-shadow var(--t-fast) var(--ease-out),
              background var(--t-fast) var(--ease-out), border-color var(--t-fast) var(--ease-out);
  will-change: transform;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--sh-2); }
.btn:active { transform: translateY(0); }
.btn--primary {
  background: var(--primary); color: var(--on-primary);
  border-color: transparent;
  box-shadow: 0 8px 22px oklch(64% 0.205 28 / 0.35);
}
.btn--primary:hover { background: var(--primary-press); box-shadow: 0 12px 28px oklch(64% 0.205 28 / 0.42); }
.btn--ghost { background: transparent; border-color: transparent; }
.btn--ghost:hover { background: var(--surface-2); box-shadow: none; }
.btn--accent { background: var(--accent); color: var(--ink); border-color: transparent; box-shadow: 0 6px 18px oklch(72% 0.16 128 / 0.35); }
.btn--accent:hover { background: oklch(88% 0.18 128); box-shadow: 0 10px 24px oklch(72% 0.16 128 / 0.45); }
.btn--secondary { background: var(--surface-2); color: var(--ink); border-color: var(--line-strong); }
.btn--secondary:hover { background: var(--surface-3); border-color: var(--ink-soft); }
.btn--danger { background: var(--danger); color: #fff; border-color: transparent; box-shadow: 0 8px 22px oklch(55% 0.21 25 / 0.32); }
.btn--danger:hover { background: oklch(54% 0.21 25); box-shadow: 0 12px 28px oklch(55% 0.21 25 / 0.38); }
.btn--sm { padding: 0.5rem 0.85rem; min-height: 38px; font-size: var(--fs-xs); }
.btn--icon { padding: 0; width: 44px; height: 44px; border-radius: 50%; }
.btn--block { width: 100%; }

/* ---------- Chips / badges ---------- */
.chip {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: var(--font-ui); font-size: var(--fs-xs); font-weight: 600;
  padding: 0.32rem 0.7rem; border-radius: var(--r-pill);
  background: var(--surface-2); color: var(--ink-soft);
  border: 1px solid var(--line);
}
.chip--primary { background: var(--primary-soft); color: var(--primary); border-color: transparent; }
.chip--accent { background: var(--accent-soft); color: oklch(45% 0.14 130); border-color: transparent; }
.chip--dot::before { content:""; width:7px; height:7px; border-radius:50%; background: currentColor; }

/* ---------- Cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-1);
  transition: transform var(--t-med) var(--ease-out), box-shadow var(--t-med) var(--ease-out), border-color var(--t-med) var(--ease-out);
}
.card--hover:hover { transform: translateY(-4px); box-shadow: var(--sh-3); border-color: var(--line-strong); }

/* =========================================================================
   Top navigation (desktop)
   ========================================================================= */
.nav {
  position: sticky; top: 0; z-index: 40;
  height: var(--nav-h);
  display: flex; align-items: center;
  background: color-mix(in oklch, var(--bg) 82%, transparent);
  backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav__inner { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(1rem, 0.6rem + 2vw, 2.5rem);
  display: flex; align-items: center; gap: var(--s-6); }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; font-family: var(--font-display); font-weight: 800; font-size: 1.2rem; letter-spacing: -0.02em; }
.brand__mark {
  width: 34px; height: 34px; border-radius: 11px;
  background: linear-gradient(135deg, var(--primary), oklch(70% 0.16 350));
  display: grid; place-items: center; color: #fff; font-size: 1.05rem;
  box-shadow: 0 6px 16px oklch(64% 0.205 28 / 0.4);
  transform: rotate(-6deg);
}
.brand__mark span { transform: rotate(6deg); }
.nav__links { display: flex; gap: 0.25rem; margin-left: var(--s-4); }
.nav__link {
  font-family: var(--font-ui); font-weight: 600; font-size: var(--fs-sm);
  padding: 0.5rem 0.85rem; border-radius: var(--r-pill);
  color: var(--ink-soft); transition: color var(--t-fast), background var(--t-fast);
}
.nav__link:hover { color: var(--ink); background: var(--surface-2); }
.nav__link.is-active { color: var(--primary); background: var(--primary-soft); }
.nav__spacer { flex: 1; }
.nav__actions { display: flex; align-items: center; gap: var(--s-2); }
.ghost-toggle {
  width: 44px; height: 44px; border-radius: 50%;
  display: grid; place-items: center; border: 1.5px solid var(--line-strong);
  transition: background var(--t-fast), transform var(--t-fast) var(--ease-out);
}
.ghost-toggle:hover { background: var(--surface-2); transform: rotate(12deg); }
.icon-sun, .icon-moon { width: 20px; height: 20px; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon, :root:not([data-theme]) .icon-moon { display: none; }

/* Mobile top bar (compact) */
.mtop { display: none; }

/* =========================================================================
   Hero
   ========================================================================= */
.hero { padding-top: var(--s-10); padding-bottom: var(--s-8); }
.hero__grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: var(--s-10); align-items: center; }
.hero h1 { font-family: var(--font-display); font-weight: 800; font-size: var(--fs-3xl); line-height: var(--lh-tight); letter-spacing: -0.03em; margin-top: var(--s-4); }
.hero p.lead { font-size: var(--fs-md); color: var(--ink-soft); margin-top: var(--s-5); max-width: 46ch; }
.hero__cta { display: flex; flex-wrap: wrap; gap: var(--s-3); margin-top: var(--s-8); }
.hero__stats { display: flex; gap: var(--s-8); margin-top: var(--s-10); }
.stat__num { font-family: var(--font-display); font-weight: 800; font-size: var(--fs-xl); letter-spacing: -0.02em; }
.stat__label { font-size: var(--fs-xs); color: var(--ink-faint); font-family: var(--font-ui); text-transform: uppercase; letter-spacing: 0.1em; }

/* floating player mock */
.hero__art { position: relative; }
.player-mock {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-xl);
  box-shadow: var(--sh-3); overflow: hidden;
  cursor: pointer; transition: transform var(--t-fast) var(--ease-out), box-shadow var(--t-fast);
}
.player-mock:hover { transform: translateY(-4px); box-shadow: var(--sh-pop); }
.player-mock:focus-visible { outline: 3px solid var(--primary); outline-offset: 3px; }
.player-mock:active { transform: translateY(-2px); }
.player-mock__screen {
  aspect-ratio: 16/10; position: relative;
  background:
    radial-gradient(120% 120% at 80% 10%, oklch(70% 0.18 350 / 0.6), transparent 55%),
    radial-gradient(120% 120% at 10% 100%, oklch(80% 0.16 130 / 0.5), transparent 55%),
    linear-gradient(135deg, oklch(30% 0.05 300), oklch(45% 0.08 350));
  display: grid; place-items: center;
}
.player-mock__play {
  width: 74px; height: 74px; border-radius: 50%;
  background: color-mix(in oklch, #fff 88%, transparent);
  display: grid; place-items: center; color: var(--primary);
  box-shadow: var(--sh-2);
  animation: pulse 2.6s var(--ease-out) infinite;
}
@keyframes pulse { 0%,100%{ transform: scale(1);} 50%{ transform: scale(1.06);} }
.player-mock__bar { padding: var(--s-4) var(--s-5); display: flex; flex-direction: column; gap: var(--s-3); }
.player-mock__row { display: flex; align-items: center; gap: var(--s-3); }
.track { height: 6px; flex: 1; border-radius: var(--r-pill); background: var(--surface-3); position: relative; overflow: hidden; }
.track__fill { position: absolute; inset: 0 62% 0 0; background: linear-gradient(90deg, var(--primary), oklch(70% 0.16 350)); border-radius: inherit; }
.track__dot { position: absolute; left: 38%; top: 50%; transform: translate(-50%,-50%); width: 13px; height: 13px; border-radius: 50%; background: #fff; box-shadow: var(--sh-1); border: 2px solid var(--primary); }
.sentence-chip { font-family: var(--font-ui); font-size: var(--fs-sm); padding: 0.5rem 0.8rem; border-radius: var(--r-md); background: var(--surface-2); border: 1px solid var(--line); }
.sentence-chip.is-on { background: var(--primary-soft); border-color: transparent; color: var(--primary); font-weight: 600; }
.float-badge {
  position: absolute; right: -14px; bottom: 26px;
  background: var(--accent); color: var(--ink); font-family: var(--font-display); font-weight: 800;
  padding: 0.6rem 1rem; border-radius: var(--r-pill); box-shadow: var(--sh-2);
  transform: rotate(-5deg); display: flex; align-items: center; gap: 0.4rem;
}

/* =========================================================================
   Section heading
   ========================================================================= */
.sec-head { display: flex; align-items: end; justify-content: space-between; gap: var(--s-4); flex-wrap: wrap; margin-bottom: var(--s-8); }
.sec-head h2 { font-family: var(--font-display); font-weight: 800; font-size: var(--fs-xl); letter-spacing: -0.02em; margin-top: var(--s-3); }
.sec-head p { color: var(--ink-soft); max-width: 52ch; margin-top: var(--s-2); }

/* =========================================================================
   Clip grid
   ========================================================================= */
.clip-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-5); }
.clip {
  position: relative; overflow: hidden; cursor: pointer;
  display: flex; flex-direction: column;
}
.clip__thumb { aspect-ratio: 16/9; position: relative; overflow: hidden; background: var(--surface-3); }
.clip__thumb > div {
  position: absolute; inset: 0;
  transition: transform var(--t-slow) var(--ease-out);
}
.clip:hover .clip__thumb > div { transform: scale(1.06); }
.clip__dur { position: absolute; right: 10px; bottom: 10px; font-family: var(--font-mono); font-size: var(--fs-xs); font-weight: 600;
  background: color-mix(in oklch, #000 60%, transparent); color: #fff; padding: 0.15rem 0.5rem; border-radius: var(--r-pill); }
.clip__body { padding: var(--s-4) var(--s-5) var(--s-5); display: flex; flex-direction: column; gap: var(--s-2); flex: 1; }
.clip__title { font-family: var(--font-display); font-weight: 700; font-size: var(--fs-md); letter-spacing: -0.01em; line-height: var(--lh-snug); }
.clip__meta { display: flex; align-items: center; gap: var(--s-2); margin-top: auto; flex-wrap: wrap; }
.clip__play { position: absolute; top: 12px; left: 12px; width: 42px; height: 42px; border-radius: 50%;
  background: color-mix(in oklch, #fff 90%, transparent); color: var(--primary); display: grid; place-items: center;
  box-shadow: var(--sh-2); transform: scale(0.85); opacity: 0; transition: all var(--t-med) var(--ease-out); }
.clip:hover .clip__play { transform: scale(1); opacity: 1; }

/* gradient thumbnails per clip */
.g1 { background: linear-gradient(135deg, oklch(64% 0.2 28), oklch(70% 0.16 350)); }
.g2 { background: linear-gradient(135deg, oklch(58% 0.12 222), oklch(70% 0.14 200)); }
.g3 { background: linear-gradient(135deg, oklch(80% 0.14 130), oklch(72% 0.16 95)); }
.g4 { background: linear-gradient(135deg, oklch(66% 0.16 300), oklch(64% 0.2 28)); }
.g5 { background: linear-gradient(135deg, oklch(70% 0.13 75), oklch(64% 0.2 28)); }
.g6 { background: linear-gradient(135deg, oklch(60% 0.14 190), oklch(84% 0.1 230)); }

.feature-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-5); margin-top: var(--s-10); }
.feature { padding: var(--s-6); }
.feature__icon { width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; font-size: 1.4rem;
  background: var(--primary-soft); margin-bottom: var(--s-4); }
.feature:nth-child(2) .feature__icon { background: var(--accent-soft); }
.feature:nth-child(3) .feature__icon { background: var(--secondary-soft); }
.feature h3 { font-family: var(--font-display); font-weight: 700; font-size: var(--fs-md); margin-bottom: var(--s-2); letter-spacing: -0.01em; }
.feature p { color: var(--ink-soft); font-size: var(--fs-sm); }

/* =========================================================================
   Player overlay
   ========================================================================= */
.overlay {
  position: fixed; inset: 0; z-index: 80;
  background: color-mix(in oklch, var(--ink) 55%, transparent);
  backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  padding: clamp(0.5rem, 1vw, 2rem);
  opacity: 0; visibility: hidden; transition: opacity var(--t-med) var(--ease-out), visibility var(--t-med);
}
.overlay.is-open { opacity: 1; visibility: visible; }
.player {
  width: min(1100px, 100%); height: 94vh; max-height: 94vh;
  background: var(--surface); border-radius: var(--r-xl);
  box-shadow: var(--sh-pop); overflow: hidden;
  display: grid; grid-template-columns: 1.35fr 1fr;
  transform: translateY(18px) scale(0.98); transition: transform var(--t-med) var(--ease-out);
}
.overlay.is-open .player { transform: none; }
.player__stage { background: #0c0a14; display: flex; flex-direction: column; height: 100%; min-height: 0; overflow: hidden; }
.player__video-wrap { position: relative; flex: 1 1 auto; min-height: 0; background: #000; display: grid; place-items: center; overflow: hidden; }
.player__video-wrap video { width: 100%; height: 100%; object-fit: contain; background: #000; }
.player__close {
  position: fixed; top: clamp(0.5rem, 1.5vw, 1.25rem); right: clamp(0.5rem, 1.5vw, 1.25rem); z-index: 90;
  width: 44px; height: 44px; border-radius: 50%; background: color-mix(in oklch, #000 55%, transparent);
  color: #fff; display: grid; place-items: center; transition: background var(--t-fast), transform var(--t-fast) var(--ease-out);
}
.player__close:hover { background: color-mix(in oklch, #000 75%, transparent); transform: scale(1.08); }
@media (max-width: 560px) {
  .player__close { width: 38px; height: 38px; top: 0.4rem; right: 0.4rem; }
}

/* control bar */
.controls { padding: var(--s-3) var(--s-4) var(--s-4); background: #15121f; color: #f3eefb; display: flex; flex-direction: column; gap: var(--s-3); flex-shrink: 0; }
.scrub { display: flex; align-items: center; gap: var(--s-3); }
.scrub .track { height: 7px; }
.scrub .track__fill { background: linear-gradient(90deg, var(--primary), oklch(70% 0.16 350)); }
.scrub .track__dot { background: #fff; border-color: var(--primary); }
.time { font-family: var(--font-mono); font-size: var(--fs-xs); color: #cbbfe0; min-width: 92px; text-align: center; }
.ctrl-row { display: flex; align-items: center; gap: var(--s-2); flex-wrap: wrap; }
.ctrl-btn {
  width: 42px; height: 42px; border-radius: 50%; display: grid; place-items: center;
  color: #f3eefb; background: color-mix(in oklch, #fff 10%, transparent);
  transition: background var(--t-fast), transform var(--t-fast) var(--ease-out);
}
.ctrl-btn:hover { background: color-mix(in oklch, #fff 20%, transparent); transform: translateY(-1px); }
.ctrl-btn--play { width: 52px; height: 52px; background: var(--primary); color: #fff; }
.ctrl-btn--play:hover { background: var(--primary-press); }
.ctrl-btn.is-on { background: var(--accent); color: var(--ink); }
.ctrl-btn.is-muted { background: color-mix(in oklch, var(--danger) 25%, transparent); color: #fff; }
.ctrl-sep { width: 1px; height: 26px; background: color-mix(in oklch, #fff 18%, transparent); margin-inline: 0.2rem; }
.speed {
  font-family: var(--font-ui); font-weight: 600; font-size: var(--fs-xs);
  background: color-mix(in oklch, #fff 10%, transparent); color: #f3eefb;
  padding: 0.5rem 0.7rem; border-radius: var(--r-pill); min-width: 54px; text-align: center;
}
.speed option { color: #111; }
.loop-count {
  display: inline-flex; align-items: center; gap: 0.35rem;
  font-family: var(--font-ui); font-size: var(--fs-xs); font-weight: 600;
  background: color-mix(in oklch, #fff 10%, transparent); color: #f3eefb;
  padding: 0.5rem 0.7rem; border-radius: var(--r-pill);
}
.loop-count select { background: transparent; color: inherit; border: none; font: inherit; font-weight: 700; }
.loop-count select option { color: #111; }

/* transcript panel */
.transcript { display: flex; flex-direction: column; min-height: 0; height: 100%; overflow: hidden; border-left: 1px solid var(--line); }
.transcript__head { padding: var(--s-4) var(--s-5); border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: var(--s-3); }
.transcript__head h3 { font-family: var(--font-display); font-weight: 700; font-size: var(--fs-md); letter-spacing: -0.01em; }
.transcript__list { overflow-y: auto; padding: var(--s-3) var(--s-4) var(--s-8); flex: 1; scroll-behavior: smooth; }
.t-line {
  display: grid; grid-template-columns: 1fr auto; gap: var(--s-2);
  padding: var(--s-3) var(--s-3); border-radius: var(--r-md);
  cursor: pointer; transition: background var(--t-fast) var(--ease-out);
  border: 1px solid transparent;
}
.t-line:hover { background: var(--surface-2); }
.t-line.is-active { background: var(--primary-soft); border-color: color-mix(in oklch, var(--primary) 30%, transparent); }
.t-line.is-active .t-en { color: var(--primary); }
.t-en { font-family: var(--font-ui); font-weight: 500; font-size: var(--fs-base); line-height: var(--lh-snug); }
.t-zh { font-size: var(--fs-sm); color: var(--ink-soft); margin-top: 0.2rem; }
.t-actions { display: flex; flex-direction: column; gap: 0.3rem; align-items: center; }
.t-star, .t-loop {
  width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center;
  color: var(--ink-faint); transition: all var(--t-fast) var(--ease-out);
}
.t-star:hover { color: var(--warning); background: var(--surface-2); }
.t-star.is-saved { color: var(--warning); }
.t-loop:hover { color: var(--primary); background: var(--surface-2); }
.t-loop.is-on { color: #fff; background: var(--primary); }
/* clickable words */
.word { cursor: pointer; border-bottom: 1.5px dotted var(--line-strong); position: relative;
  transition: border-color var(--t-fast), background var(--t-fast); border-radius: 3px; padding: 0 1px; }
.word:hover { border-bottom-color: var(--accent); background: var(--accent-soft); }
.word::after {
  content: "双击收藏 ⭐"; position: absolute; left: 50%; top: calc(100% + 6px);
  transform: translateX(-50%) translateY(-4px); white-space: nowrap;
  font-family: var(--font-ui); font-size: 0.72rem; font-weight: 600;
  background: var(--ink); color: var(--bg); padding: 0.28rem 0.55rem; border-radius: var(--r-sm);
  opacity: 0; pointer-events: none; transition: opacity var(--t-fast), transform var(--t-fast);
  box-shadow: var(--sh-2); z-index: 6;
}
.word:hover::after { opacity: 1; transform: translateX(-50%) translateY(0); }
.word.is-known { color: var(--success); border-bottom-style: solid; }
.word.is-known:hover { background: var(--accent-soft); }
/* word highlight when jumping from collection */
.word.is-highlight {
  animation: wordPulse 1.6s ease-out 3;
  color: var(--primary);
  border-bottom: 2px solid var(--primary);
  border-radius: 3px;
  background: var(--primary-soft);
}
@keyframes wordPulse {
  0%   { box-shadow: 0 0 0 0 color-mix(in oklch, var(--primary) 45%, transparent); }
  40%  { box-shadow: 0 0 0 8px color-mix(in oklch, var(--primary) 20%, transparent); }
  100% { box-shadow: 0 0 0 0 transparent; }
}
.transcript__hint { font-size: var(--fs-xs); color: var(--ink-soft); padding: 0 var(--s-5) var(--s-4);
  display: flex; align-items: center; gap: 0.4rem; line-height: 1.4; }
.transcript__hint::before { content: "💡"; }
.transcript__hint b { color: var(--primary); font-weight: 700; }

/* =========================================================================
   Collections (sentences / words)
   ========================================================================= */
.coll-toolbar { display: flex; align-items: center; gap: var(--s-3); flex-wrap: wrap; margin-bottom: var(--s-6); }
.search {
  flex: 1; min-width: 220px; display: flex; align-items: center; gap: var(--s-2);
  background: var(--surface); border: 1.5px solid var(--line-strong); border-radius: var(--r-pill);
  padding: 0.55rem 1rem; transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.search:focus-within { border-color: var(--primary); box-shadow: 0 0 0 4px var(--ring); }
.search input { border: none; background: none; outline: none; width: 100%; font-size: var(--fs-sm); }
.seg { display: inline-flex; background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--r-pill); padding: 3px; }
.seg button { font-family: var(--font-ui); font-weight: 600; font-size: var(--fs-xs); padding: 0.45rem 0.85rem; border-radius: var(--r-pill); color: var(--ink-soft); transition: all var(--t-fast); }
.seg button.is-active { background: var(--surface); color: var(--ink); box-shadow: var(--sh-1); }

.sentence-list { display: flex; flex-direction: column; gap: var(--s-3); }
.s-card { padding: var(--s-4) var(--s-5); display: flex; align-items: flex-start; gap: var(--s-4); }
.s-card__main { flex: 1; min-width: 0; }
.s-card__en { font-family: var(--font-ui); font-weight: 500; font-size: var(--fs-md); line-height: var(--lh-snug); }
.s-card__zh { color: var(--ink-soft); font-size: var(--fs-sm); margin-top: 0.25rem; }
.s-card__src { margin-top: var(--s-2); }
.s-card__side { display: flex; flex-direction: column; gap: var(--s-2); align-items: center; }
.icon-btn { width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center; color: var(--ink-soft); transition: all var(--t-fast) var(--ease-out); border: 1px solid var(--line); background: var(--surface); }
.icon-btn:hover { color: var(--primary); border-color: color-mix(in oklch, var(--primary) 40%, transparent); transform: translateY(-2px); }
.icon-btn--danger:hover { color: var(--danger); border-color: color-mix(in oklch, var(--danger) 40%, transparent); }

/* word grid */
.word-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: var(--s-4); }
.w-card { padding: var(--s-5); display: flex; flex-direction: column; gap: var(--s-3); position: relative; }
.w-card__top { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--s-2); }
.w-term { font-family: var(--font-display); font-weight: 800; font-size: var(--fs-lg); letter-spacing: -0.02em; }
.w-phon { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--ink-faint); }
.w-pos { font-family: var(--font-ui); font-size: var(--fs-xs); font-weight: 600; color: var(--secondary); background: var(--secondary-soft); padding: 0.15rem 0.55rem; border-radius: var(--r-pill); white-space: nowrap; }
.w-def { font-size: var(--fs-sm); color: var(--ink-soft); line-height: var(--lh-normal); }
.w-note { font-size: var(--fs-xs); color: var(--ink-faint); border-left: 2px solid var(--accent); padding-left: var(--s-3); }
.w-card__foot { display: flex; align-items: center; gap: var(--s-2); margin-top: auto; padding-top: var(--s-2); border-top: 1px dashed var(--line); }
.w-card__src { font-size: var(--fs-xs); color: var(--ink-faint); flex: 1; }
.tag-known { font-family: var(--font-ui); font-size: var(--fs-xs); font-weight: 600; color: var(--success); display: inline-flex; align-items: center; gap: 0.25rem; }

/* word card — jump-to-source */
.w-card__src[data-jump] { color: var(--primary); font-weight: 500; transition: color var(--t-fast); }
.w-card__src[data-jump]:hover { color: var(--primary-dark); text-decoration: underline; text-underline-offset: 2px; }
.w-jump-btn { color: var(--primary); transition: color var(--t-fast), background var(--t-fast), border-color var(--t-fast); }
.w-jump-btn:hover { color: #fff; background: var(--primary); border-color: var(--primary); }

/* empty state */
.empty { text-align: center; padding: var(--s-16) var(--s-4); max-width: 460px; margin-inline: auto; }
.empty__art { width: 120px; height: 120px; margin: 0 auto var(--s-6); }
.empty h3 { font-family: var(--font-display); font-weight: 700; font-size: var(--fs-lg); margin-bottom: var(--s-2); }
.empty p { color: var(--ink-soft); font-size: var(--fs-sm); margin-bottom: var(--s-5); }

/* =========================================================================
   Add-word modal
   ========================================================================= */
.modal { position: fixed; inset: 0; z-index: 90; display: grid; place-items: center; padding: 1rem;
  background: color-mix(in oklch, var(--ink) 50%, transparent); backdrop-filter: blur(6px);
  opacity: 0; visibility: hidden; transition: opacity var(--t-med) var(--ease-out), visibility var(--t-med); }
.modal.is-open { opacity: 1; visibility: visible; }
.modal__card { width: min(440px, 100%); background: var(--surface); border-radius: var(--r-xl); box-shadow: var(--sh-pop);
  padding: var(--s-6); transform: translateY(16px) scale(0.97); transition: transform var(--t-med) var(--ease-out); }
.modal.is-open .modal__card { transform: none; }
.modal__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--s-5); }
.modal__head h3 { font-family: var(--font-display); font-weight: 700; font-size: var(--fs-lg); }
.modal__icon { font-size: var(--fs-3xl); margin-bottom: var(--s-3); line-height: 1; }
.confirm-modal__text { color: var(--ink-soft); font-size: var(--fs-base); margin-bottom: var(--s-6); line-height: 1.55; }
.confirm-modal__actions { display: flex; gap: var(--s-3); justify-content: center; }
.confirm-modal__actions .btn { min-width: 110px; }
.field { margin-bottom: var(--s-4); }
.field label { display: block; font-family: var(--font-ui); font-size: var(--fs-xs); font-weight: 600; color: var(--ink-soft); margin-bottom: 0.4rem; text-transform: uppercase; letter-spacing: 0.06em; }
.field input, .field textarea {
  width: 100%; background: var(--surface-2); border: 1.5px solid var(--line); border-radius: var(--r-md);
  padding: 0.7rem 0.9rem; font-size: var(--fs-sm); transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px var(--ring); }
.field textarea { resize: vertical; min-height: 70px; }
.word-preview { font-family: var(--font-display); font-weight: 800; font-size: var(--fs-xl); color: var(--primary); }
.field-hint { font-size: var(--fs-xs); color: var(--ink-soft); margin-top: 0.4rem; display: flex; align-items: center; gap: 0.3rem; }
.field-hint[hidden] { display: none; }

/* toast */
.toast-wrap { position: fixed; left: 50%; bottom: 90px; transform: translateX(-50%); z-index: 120; display: flex; flex-direction: column; gap: 0.5rem; align-items: center; pointer-events: none; }
.toast { background: var(--ink); color: var(--bg); font-family: var(--font-ui); font-weight: 600; font-size: var(--fs-sm);
  padding: 0.7rem 1.1rem; border-radius: var(--r-pill); box-shadow: var(--sh-3); display: flex; align-items: center; gap: 0.5rem;
  animation: toast-in var(--t-med) var(--ease-out); }
.toast .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
@keyframes toast-in { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

/* =========================================================================
   Bottom tab bar (mobile)
   ========================================================================= */
.tabbar { display: none; }

/* =========================================================================
   Footer
   ========================================================================= */
.footer { border-top: 1px solid var(--line); padding-block: var(--s-8); margin-top: var(--s-12); }
.footer__grid { display: flex; align-items: center; justify-content: space-between; gap: var(--s-4); flex-wrap: wrap; }
.footer small { color: var(--ink-faint); font-family: var(--font-ui); }

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 1024px) {
  .hero__grid { grid-template-columns: 1fr; gap: var(--s-8); }
  .hero__art { max-width: 520px; }
  .clip-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-row { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .nav { display: none; }
  .mtop {
    display: flex; align-items: center; justify-content: space-between;
    position: sticky; top: 0; z-index: 40; height: 56px; padding-inline: 1rem;
    background: color-mix(in oklch, var(--bg) 85%, transparent);
    backdrop-filter: saturate(140%) blur(14px); border-bottom: 1px solid var(--line);
  }
  .player {
    grid-template-columns: 1fr;
    height: auto;
    max-height: 92vh;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
  }
  .player__stage { flex-shrink: 0; height: auto; overflow: visible; }
  .player__video-wrap { min-height: 240px; height: auto; max-height: none; }
  .transcript { border-left: none; border-top: 1px solid var(--line); flex: none; min-height: auto; overflow: visible; }
  .transcript__list { flex: none; overflow-y: visible; max-height: none; }
  .tabbar {
    display: flex; position: fixed; bottom: 0; left: 0; right: 0; z-index: 60;
    background: color-mix(in oklch, var(--surface) 92%, transparent);
    backdrop-filter: saturate(160%) blur(16px); border-top: 1px solid var(--line);
    padding: 0.4rem 0.5rem calc(0.4rem + env(safe-area-inset-bottom));
    justify-content: space-around;
  }
  .tab { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 0.3rem 0.7rem;
    font-family: var(--font-ui); font-size: 0.68rem; font-weight: 600; color: var(--ink-faint); transition: color var(--t-fast); }
  .tab svg { width: 22px; height: 22px; }
  .tab.is-active { color: var(--primary); }
  body { padding-bottom: 72px; }
  .toast-wrap { bottom: 84px; }
}

@media (max-width: 560px) {
  .clip-grid { grid-template-columns: 1fr; }
  .hero__stats { gap: var(--s-5); }
  .ctrl-row { gap: 0.3rem; }
  .loop-count, .speed { padding: 0.45rem 0.55rem; }
}

/* =========================================================================
   Library (影片库) + tag filter + favorite
   ========================================================================= */
.lib-toolbar { display: flex; align-items: center; gap: var(--s-3); flex-wrap: wrap; margin-bottom: var(--s-4); }
.lib-toolbar .search { min-width: 200px; }
.lib-favonly.is-on { background: var(--primary-soft); color: var(--primary); border-color: transparent; }
.tag-filter { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: var(--s-6); }
.tag-filter__chip {
  font-family: var(--font-ui); font-weight: 600; font-size: var(--fs-xs);
  padding: 0.5rem 0.95rem; border-radius: var(--r-pill);
  background: var(--surface); color: var(--ink-soft);
  border: 1.5px solid var(--line-strong);
  transition: all var(--t-fast) var(--ease-out); cursor: pointer;
}
.tag-filter__chip:hover { border-color: var(--primary); color: var(--primary); }
.tag-filter__chip.is-on { background: var(--primary); color: var(--on-primary); border-color: transparent; }

.clip__fav {
  position: absolute; top: 12px; right: 12px; width: 38px; height: 38px; border-radius: 50%;
  background: color-mix(in oklch, #000 42%, transparent); color: #fff;
  display: grid; place-items: center; transition: all var(--t-fast) var(--ease-out);
}
.clip__fav:hover { background: color-mix(in oklch, #000 62%, transparent); transform: scale(1.12); }
.clip__fav svg { transition: transform var(--t-fast) var(--ease-out); }
.clip__fav.is-on { color: var(--danger); background: color-mix(in oklch, #fff 92%, transparent); }
.clip__fav.is-on svg { fill: currentColor; transform: scale(1.05); }

/* =========================================================================
   Profile (我的)
   ========================================================================= */
.profile-head { display: flex; align-items: center; gap: var(--s-4); padding: var(--s-6); margin-bottom: var(--s-5); }
.profile-head__avatar {
  width: 60px; height: 60px; border-radius: 50%; flex: none;
  display: grid; place-items: center; color: #fff;
  font-family: var(--font-display); font-weight: 800; font-size: 1.4rem;
  background: linear-gradient(135deg, var(--primary), oklch(70% 0.16 350));
  box-shadow: 0 6px 16px oklch(64% 0.205 28 / 0.4);
}
.profile-head__info { flex: 1; min-width: 0; }
.profile-head__info h2 { font-family: var(--font-display); font-weight: 700; font-size: var(--fs-lg); letter-spacing: -0.01em; }
.profile-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-4); margin-bottom: var(--s-8); }
.profile-stat { padding: var(--s-5); text-align: center; }
.profile-stat b { display: block; font-family: var(--font-display); font-weight: 800; font-size: var(--fs-xl); letter-spacing: -0.02em; }
.profile-stat span { font-size: var(--fs-xs); color: var(--ink-faint); }
.profile-settings { padding: var(--s-2) var(--s-5); }
.setting-row { display: flex; align-items: center; justify-content: space-between; padding: var(--s-4) 0; border-bottom: 1px solid var(--line); }
.setting-row:last-child { border-bottom: none; }
.profile-gate { padding: var(--s-10) var(--s-6); text-align: center; max-width: 520px; margin: 0 auto; }
.profile-gate__art { font-size: 3rem; }
.profile-gate h2 { font-family: var(--font-display); font-weight: 800; font-size: var(--fs-xl); margin: var(--s-3) 0 var(--s-2); letter-spacing: -0.02em; }
.profile-gate__cta { margin: var(--s-5) 0; }
.profile-gate__stats { display: flex; justify-content: center; gap: var(--s-8); margin-top: var(--s-6); }
.profile-gate__stats div { display: flex; flex-direction: column; }
.profile-gate__stats b { font-family: var(--font-display); font-weight: 800; font-size: var(--fs-lg); }
.profile-gate__stats span { font-size: var(--fs-xs); color: var(--ink-faint); }

/* =========================================================================
   Auth modal
   ========================================================================= */
.auth-tabs { display: flex; gap: 0.25rem; background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--r-pill); padding: 3px; margin-bottom: var(--s-5); }
.auth-tabs button { flex: 1; font-family: var(--font-ui); font-weight: 600; font-size: var(--fs-sm); padding: 0.55rem; border-radius: var(--r-pill); color: var(--ink-soft); transition: all var(--t-fast); }
.auth-tabs button.is-active { background: var(--surface); color: var(--ink); box-shadow: var(--sh-1); }
.auth-hint { font-size: var(--fs-xs); color: var(--ink-faint); text-align: center; margin-top: var(--s-4); }

/* ---------- view switching ---------- */
.view { display: none; }
.view.is-active { display: block; animation: view-in var(--t-med) var(--ease-out); }
@keyframes view-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}