/* tubelight — Untitled UI design language in plain CSS.
   Tokens follow Untitled UI's gray/brand scales, type scale, radii, shadows
   and focus rings. No framework, no build step. */

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("fonts/Inter-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  /* Primitives: Untitled UI gray and brand (purple) scales */
  --gray-25: #FCFCFD; --gray-50: #F9FAFB; --gray-100: #F2F4F7; --gray-200: #EAECF0; --gray-300: #D0D5DD;
  --gray-400: #98A2B3; --gray-500: #667085; --gray-600: #475467; --gray-700: #344054; --gray-800: #182230;
  --gray-900: #101828; --gray-950: #0C111D;
  --brand-50: #F9F5FF; --brand-100: #F4EBFF; --brand-200: #E9D7FE; --brand-300: #D6BBFB; --brand-400: #B692F6;
  --brand-500: #9E77ED; --brand-600: #7F56D9; --brand-700: #6941C6; --brand-800: #53389E; --brand-900: #42307D;
  --success-50: #ECFDF3; --success-200: #ABEFC6; --success-500: #17B26A; --success-600: #079455; --success-700: #067647;
  --error-600: #D92D20;

  /* Semantic (light) */
  --bg-primary: #FFFFFF;
  --bg-secondary: var(--gray-50);
  --bg-tertiary: var(--gray-100);
  --bg-active: var(--gray-50);
  --bg-brand-primary: var(--brand-50);
  --bg-brand-solid: var(--brand-600);
  --bg-brand-solid-hover: var(--brand-700);
  --border-primary: var(--gray-300);
  --border-secondary: var(--gray-200);
  --border-brand: var(--brand-300);
  --text-primary: var(--gray-900);
  --text-secondary: var(--gray-700);
  --text-tertiary: var(--gray-600);
  --text-quaternary: var(--gray-500);
  --text-placeholder: var(--gray-500);
  --text-brand: var(--brand-700);
  --text-on-brand: #FFFFFF;
  --fg-quaternary: var(--gray-400);
  --fg-brand: var(--brand-600);
  --utility-success-bg: var(--success-50);
  --utility-success-border: var(--success-200);
  --utility-success-text: var(--success-700);
  --ring: 0 0 0 4px var(--brand-100);
  --ring-gray: 0 0 0 4px var(--gray-100);
  --shadow-xs: 0 1px 2px 0 rgba(16, 24, 40, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(16, 24, 40, 0.10), 0 1px 2px 0 rgba(16, 24, 40, 0.06);
  --shadow-md: 0 4px 8px -2px rgba(16, 24, 40, 0.10), 0 2px 4px -2px rgba(16, 24, 40, 0.06);
  --shadow-lg: 0 12px 16px -4px rgba(16, 24, 40, 0.08), 0 4px 6px -2px rgba(16, 24, 40, 0.03);
  --thumb-bg: var(--gray-100);

  --sidebar-w: 296px;
  --radius-sm: 6px; --radius-md: 8px; --radius-lg: 12px; --radius-xl: 16px;
  --font: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-primary: var(--gray-950); --bg-secondary: var(--gray-900); --bg-tertiary: var(--gray-800); --bg-active: var(--gray-800);
    --bg-brand-primary: #2C1C5F; --bg-brand-solid: var(--brand-600); --bg-brand-solid-hover: var(--brand-500);
    --border-primary: var(--gray-700); --border-secondary: var(--gray-800); --border-brand: var(--brand-400);
    --text-primary: var(--gray-50); --text-secondary: var(--gray-300); --text-tertiary: var(--gray-400); --text-quaternary: var(--gray-400);
    --text-placeholder: var(--gray-500); --text-brand: var(--brand-300); --fg-quaternary: var(--gray-500); --fg-brand: var(--brand-500);
    --utility-success-bg: #053321; --utility-success-border: #085D3A; --utility-success-text: #75E0A7;
    --ring: 0 0 0 4px rgba(158, 119, 237, 0.24); --ring-gray: 0 0 0 4px rgba(152, 162, 179, 0.14);
    --thumb-bg: var(--gray-800);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg-primary: var(--gray-950); --bg-secondary: var(--gray-900); --bg-tertiary: var(--gray-800); --bg-active: var(--gray-800);
  --bg-brand-primary: #2C1C5F; --bg-brand-solid: var(--brand-600); --bg-brand-solid-hover: var(--brand-500);
  --border-primary: var(--gray-700); --border-secondary: var(--gray-800); --border-brand: var(--brand-400);
  --text-primary: var(--gray-50); --text-secondary: var(--gray-300); --text-tertiary: var(--gray-400); --text-quaternary: var(--gray-400);
  --text-placeholder: var(--gray-500); --text-brand: var(--brand-300); --fg-quaternary: var(--gray-500); --fg-brand: var(--brand-500);
  --utility-success-bg: #053321; --utility-success-border: #085D3A; --utility-success-text: #75E0A7;
  --ring: 0 0 0 4px rgba(158, 119, 237, 0.24); --ring-gray: 0 0 0 4px rgba(152, 162, 179, 0.14);
  --thumb-bg: var(--gray-800);
  color-scheme: dark;
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg-primary); color: var(--text-primary);
  font: 400 16px/24px var(--font);
  -webkit-font-smoothing: antialiased; -webkit-text-size-adjust: 100%;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
h1, h2, h3, p { margin: 0; }
[hidden] { display: none !important; }
.icon { width: 20px; height: 20px; flex: none; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
:focus-visible { outline: none; box-shadow: var(--ring); border-radius: var(--radius-md); }

/* ---------- app shell ---------- */
.app { display: flex; min-height: 100dvh; }
.sidebar {
  width: var(--sidebar-w); flex: none;
  display: flex; flex-direction: column;
  background: var(--bg-primary); border-right: 1px solid var(--border-secondary);
  position: sticky; top: 0; height: 100dvh; overflow: hidden;
}
.sidebar-head { display: flex; align-items: center; justify-content: space-between; padding: 24px 20px 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; font-size: 20px; line-height: 30px; letter-spacing: -0.01em; }
.brand-mark {
  display: grid; place-items: center; width: 32px; height: 32px; border-radius: var(--radius-md);
  background: var(--bg-brand-solid); color: #fff; box-shadow: var(--shadow-xs);
}
.brand-mark .icon { width: 16px; height: 16px; fill: currentColor; stroke: none; }

.nav { flex: 1; overflow-y: auto; padding: 0 16px 16px; scrollbar-width: thin; }
.nav-section { margin-top: 16px; }
.nav-label {
  padding: 8px 12px 6px; font-size: 12px; line-height: 18px; font-weight: 600;
  color: var(--text-quaternary); text-transform: uppercase; letter-spacing: 0.04em;
}
.nav-item {
  display: flex; align-items: center; gap: 12px; width: 100%;
  min-height: 44px; padding: 8px 12px; border-radius: var(--radius-sm);
  font-size: 16px; line-height: 24px; font-weight: 600; color: var(--text-secondary);
  text-align: left; -webkit-tap-highlight-color: transparent;
}
.nav-item .icon { width: 24px; height: 24px; color: var(--fg-quaternary); }
.nav-item:hover { background: var(--bg-active); color: var(--text-primary); }
.nav-item[aria-current="page"] { background: var(--bg-active); color: var(--text-primary); }
.nav-item[aria-current="page"] .icon { color: var(--fg-brand); }
.nav-item .grow { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-item .count {
  font-size: 12px; line-height: 18px; font-weight: 500; color: var(--text-secondary);
  background: var(--bg-tertiary); border-radius: 999px; padding: 2px 8px;
}
.nav-shelf { display: flex; align-items: stretch; }
.nav-shelf .nav-item { border-radius: var(--radius-sm) 0 0 var(--radius-sm); }
.nav-toggle {
  display: grid; place-items: center; width: 44px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--fg-quaternary);
}
.nav-toggle:hover { background: var(--bg-active); color: var(--text-primary); }
.nav-toggle .icon { transition: transform 150ms ease; }
.nav-toggle[aria-expanded="true"] .icon { transform: rotate(180deg); }
.nav-children { margin: 2px 0 6px 0; padding-left: 12px; border-left: 1px solid var(--border-secondary); margin-left: 23px; }
.nav-children .nav-item { font-weight: 500; font-size: 15px; min-height: 40px; padding: 6px 10px; }
.sidebar-foot { padding: 12px 24px 20px; border-top: 1px solid var(--border-secondary); font-size: 12px; line-height: 18px; color: var(--text-quaternary); }

.backdrop { position: fixed; inset: 0; background: rgba(12, 17, 29, 0.6); z-index: 30; }

.content { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 12px;
  padding: 12px 32px; background: var(--bg-primary); border-bottom: 1px solid var(--border-secondary);
}
.icon-btn {
  display: inline-grid; place-items: center; width: 40px; height: 40px;
  border-radius: var(--radius-md); color: var(--text-tertiary);
}
.icon-btn:hover { background: var(--bg-active); color: var(--text-primary); }
.topbar .menu-btn, .sidebar-head .sidebar-close { display: none; }

/* Untitled UI input with leading icon */
.search { position: relative; flex: 1; max-width: 640px; }
.search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--fg-quaternary); pointer-events: none; }
.input {
  width: 100%; height: 44px; padding: 10px 14px 10px 42px;
  font: 400 16px/24px var(--font); color: var(--text-primary);
  background: var(--bg-primary); border: 1px solid var(--border-primary);
  border-radius: var(--radius-md); box-shadow: var(--shadow-xs);
  -webkit-appearance: none; appearance: none;
}
.input::placeholder { color: var(--text-placeholder); }
.input:focus { outline: none; border-color: var(--border-brand); box-shadow: var(--shadow-xs), var(--ring); }
.input::-webkit-search-decoration { -webkit-appearance: none; }
.input::-webkit-search-cancel-button { -webkit-appearance: none; height: 16px; width: 16px; background: var(--fg-quaternary); border-radius: 50%; cursor: pointer;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='3' stroke-linecap='round'%3E%3Cpath d='M17 7L7 17M7 7l10 10'/%3E%3C/svg%3E") center / 12px no-repeat; }

.view { flex: 1; padding: 24px 32px 48px; }
.view:focus { box-shadow: none; }

/* ---------- buttons & badges ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 40px; padding: 8px 14px; border-radius: var(--radius-md);
  font-size: 14px; line-height: 20px; font-weight: 600; white-space: nowrap;
  border: 1px solid transparent; box-shadow: var(--shadow-xs); -webkit-tap-highlight-color: transparent;
}
.btn .icon { width: 20px; height: 20px; }
.btn-primary { background: var(--bg-brand-solid); color: var(--text-on-brand); border-color: var(--bg-brand-solid); }
.btn-primary:hover { background: var(--bg-brand-solid-hover); border-color: var(--bg-brand-solid-hover); }
.btn-secondary { background: var(--bg-primary); color: var(--text-secondary); border-color: var(--border-primary); }
.btn-secondary:hover { background: var(--bg-secondary); color: var(--text-primary); }
.btn-secondary:focus-visible { box-shadow: var(--shadow-xs), var(--ring-gray); }
.btn-tertiary { box-shadow: none; color: var(--text-tertiary); padding: 8px 12px; }
.btn-tertiary:hover { background: var(--bg-secondary); color: var(--text-secondary); }
.btn-success { background: var(--utility-success-bg); color: var(--utility-success-text); border-color: var(--utility-success-border); }
.btn-lg { min-height: 44px; padding: 10px 16px; font-size: 16px; line-height: 24px; }
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px; border-radius: 999px; border: 1px solid var(--border-secondary);
  background: var(--bg-primary); font-size: 12px; line-height: 18px; font-weight: 500; color: var(--text-secondary);
}
.badge .icon { width: 12px; height: 12px; }
.badge-success { background: var(--utility-success-bg); border-color: var(--utility-success-border); color: var(--utility-success-text); }

/* ---------- page header & sections ---------- */
.page-head { display: flex; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }
.page-head .text { flex: 1; min-width: 0; }
.page-head h1 { font-size: 30px; line-height: 38px; font-weight: 600; letter-spacing: -0.02em; text-wrap: balance; }
.page-head .sub { margin-top: 4px; color: var(--text-tertiary); font-size: 16px; line-height: 24px; }
.page-head .actions { display: flex; gap: 12px; align-items: center; }
.crumbs { display: flex; align-items: center; gap: 8px; margin-bottom: 20px; font-size: 14px; line-height: 20px; font-weight: 600; color: var(--text-tertiary); }
.crumbs a:hover { color: var(--text-primary); }
.crumbs .icon { width: 16px; height: 16px; color: var(--fg-quaternary); }
.crumbs .here { color: var(--text-brand); }

.section { margin-bottom: 32px; }
.section-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.section-head h2 { font-size: 20px; line-height: 30px; font-weight: 600; letter-spacing: -0.01em; }
.section-head .sub { color: var(--text-tertiary); font-size: 14px; line-height: 20px; }

.chips { display: flex; gap: 8px; overflow-x: auto; padding: 2px 0 10px; margin-bottom: 14px; scrollbar-width: none; }
.chips::-webkit-scrollbar { display: none; }
.chip {
  display: inline-flex; align-items: center; gap: 8px; flex: none;
  min-height: 40px; padding: 6px 12px 6px 6px; border-radius: 999px;
  border: 1px solid var(--border-primary); background: var(--bg-primary);
  font-size: 14px; line-height: 20px; font-weight: 600; color: var(--text-secondary); box-shadow: var(--shadow-xs);
}
.chip.plain { padding-left: 14px; }
.chip:hover { background: var(--bg-secondary); }
.chip[aria-current="true"] { background: var(--bg-brand-primary); border-color: var(--border-brand); color: var(--text-brand); }
.chip .avatar { width: 28px; height: 28px; font-size: 12px; }

/* ---------- rows & grids ---------- */
.row { display: flex; gap: 20px; overflow-x: auto; overscroll-behavior-x: contain; scroll-snap-type: x proximity; padding: 4px 4px 12px; margin: -4px -4px 0; scrollbar-width: thin; }
.row > .card { flex: 0 0 var(--card-w, 280px); scroll-snap-align: start; }
.grid { display: grid; gap: 24px 20px; grid-template-columns: repeat(auto-fill, minmax(min(var(--card-w, 280px), 100%), 1fr)); }

/* ---------- video card ---------- */
.card { display: block; min-width: 0; border-radius: var(--radius-lg); -webkit-tap-highlight-color: transparent; }
.card:focus-visible { box-shadow: var(--ring); }
.thumb { position: relative; aspect-ratio: 16 / 9; background: var(--thumb-bg); border-radius: var(--radius-lg); overflow: hidden; }
.thumb img { width: 100%; height: 100%; object-fit: cover; }
@media (hover: hover) { .card:hover .thumb img { transform: scale(1.03); } }
@media (prefers-reduced-motion: no-preference) { .thumb img { transition: transform 200ms ease; } }
.dur {
  position: absolute; right: 8px; bottom: 8px; padding: 2px 6px; border-radius: var(--radius-sm);
  background: rgba(12, 17, 29, 0.8); color: #fff; font-size: 12px; line-height: 18px; font-weight: 600; font-variant-numeric: tabular-nums;
}
.watched-badge {
  position: absolute; left: 8px; top: 8px; display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px 2px 6px; border-radius: 999px; background: var(--success-600); color: #fff;
  font-size: 12px; line-height: 18px; font-weight: 600;
}
.watched-badge .icon { width: 14px; height: 14px; stroke-width: 2.5; }
.card.watched .thumb img { opacity: 0.72; }
.card.now .thumb { box-shadow: 0 0 0 3px var(--bg-brand-solid); }
.info { display: flex; gap: 12px; margin-top: 12px; }
.avatar {
  flex: none; width: 36px; height: 36px; border-radius: 50%; overflow: hidden;
  background: var(--bg-tertiary); color: var(--text-tertiary);
  display: grid; place-items: center; font-weight: 600; font-size: 14px;
  outline: 1px solid rgba(16, 24, 40, 0.08); outline-offset: -1px;
}
.avatar img { width: 100%; height: 100%; object-fit: cover; }
.avatar-lg { width: 64px; height: 64px; font-size: 24px; }
.text { min-width: 0; flex: 1; }
.card .title {
  font-size: 16px; line-height: 24px; font-weight: 600; color: var(--text-primary);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; text-wrap: pretty;
}
.card .chan, .card .stats { font-size: 14px; line-height: 20px; color: var(--text-tertiary); }
.card .chan { margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.card .stats { font-variant-numeric: tabular-nums; }

/* ---------- player view ---------- */
.player-wrap { max-width: 1120px; }
.player { width: 100%; aspect-ratio: 16 / 9; background: #000; border-radius: var(--radius-lg); overflow: hidden; }
.player iframe { width: 100%; height: 100%; border: 0; display: block; }
.player-title { margin-top: 16px; font-size: 24px; line-height: 32px; font-weight: 600; letter-spacing: -0.01em; text-wrap: balance; }
.player-meta { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 12px; }
.channel-chip { display: inline-flex; align-items: center; gap: 12px; padding: 4px 12px 4px 4px; border-radius: 999px; }
.channel-chip:hover { background: var(--bg-secondary); }
.channel-chip .name { font-size: 16px; line-height: 24px; font-weight: 600; }
.channel-chip .meta { font-size: 14px; line-height: 20px; color: var(--text-tertiary); }
.player-meta .spacer { flex: 1; }
.divider { border: 0; border-top: 1px solid var(--border-secondary); margin: 24px 0; }

/* ---------- empty states ---------- */
.empty { max-width: 480px; margin: 48px auto; text-align: center; padding: 0 16px; }
.empty .glyph { display: grid; place-items: center; width: 48px; height: 48px; margin: 0 auto 16px; border-radius: 10px; border: 1px solid var(--border-secondary); box-shadow: var(--shadow-xs); color: var(--text-secondary); }
.empty .glyph .icon { width: 24px; height: 24px; }
.empty h2 { font-size: 20px; line-height: 30px; font-weight: 600; }
.empty p { margin-top: 6px; color: var(--text-tertiary); }
.empty code { font: 14px/20px ui-monospace, "SF Mono", Menlo, Consolas, monospace; background: var(--bg-secondary); border: 1px solid var(--border-secondary); border-radius: var(--radius-sm); padding: 1px 6px; }
.empty .actions { margin-top: 20px; display: flex; gap: 12px; justify-content: center; }

/* ---------- responsive ---------- */
@media (max-width: 1023px) {
  .sidebar {
    position: fixed; inset: 0 auto 0 0; z-index: 40; width: min(var(--sidebar-w), 86vw);
    transform: translateX(-100%); transition: transform 200ms ease; box-shadow: var(--shadow-lg);
  }
  .app.nav-open .sidebar { transform: none; }
  .topbar .menu-btn, .sidebar-head .sidebar-close { display: inline-grid; }
  .topbar { padding: 10px 16px; }
  .view { padding: 20px 16px 40px; }
  .page-head h1 { font-size: 24px; line-height: 32px; }
  .row { padding-inline: 16px; margin-inline: -16px; }
  .row > .card:first-child { margin-left: 0; }
  :root { --card-w: 260px; }
}
@media (max-width: 599px) {
  :root { --card-w: 240px; }
  .grid { gap: 20px 12px; }
  .player { border-radius: 0; margin: -20px -16px 0; width: auto; }
  .player-meta .btn { flex: 1; }
}
@media (prefers-reduced-motion: reduce) { .sidebar, .nav-toggle .icon { transition: none; } }