:root {
  --bg: #f6f7f9;
  --bg-card: #ffffff;
  --bg-elevated: #ffffff;
  --bg-glass: rgba(246, 247, 249, 0.88);
  --bg-subtle: #eff1f4;
  --bg-chip: #eceef2;
  --bg-chip-hover: #e1e4e9;
  --bg-hover: #eceef2;
  --border: #e3e6ea;
  --text: #0f0f0f;
  --text-2: #606060;
  --text-3: #909090;
  --brand: #c2410c;
  --brand-mark: #ff6600;
  --avatar-l-bg: 91%;
  --avatar-l-fg: 30%;
  --radius-sm: 8px;
  --radius: 12px;
  --pill: 999px;
  --header-h: 56px;
  --sidebar-w: 240px;
  --font: system-ui, -apple-system, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
  --ease: cubic-bezier(0.2, 0, 0, 1);

  /* Depth & glass layer */
  --border-subtle: rgba(15, 23, 42, 0.08);
  --glass-border: rgba(255, 255, 255, 0.5);
  --card-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.9);
  --card-shadow: 0 1px 2px rgba(15, 23, 42, 0.04),
    0 4px 16px rgba(15, 23, 42, 0.05);
  --card-shadow-hover: 0 2px 4px rgba(15, 23, 42, 0.06),
    0 12px 30px rgba(15, 23, 42, 0.1);
  --ambient-opacity: 0.14;

  /* Scrollbars */
  --scroll-thumb: rgba(15, 15, 15, 0.18);
  --scroll-thumb-hover: rgba(15, 15, 15, 0.34);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0d10;
    --bg-card: #13161b;
    --bg-elevated: #161a20;
    --bg-glass: rgba(11, 13, 16, 0.88);
    --bg-subtle: #161a20;
    --bg-chip: #1c2129;
    --bg-chip-hover: #262c36;
    --bg-hover: #191d23;
    --border: #262c36;
    --text: #f1f1f1;
    --text-2: #aaaaaa;
    --text-3: #757575;
    --brand: #fb923c;
    --brand-mark: #ff6600;
    --avatar-l-bg: 24%;
    --avatar-l-fg: 82%;

    --border-subtle: rgba(255, 255, 255, 0.07);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.08);
    --card-shadow: 0 4px 16px rgba(0, 0, 0, 0.45);
    --card-shadow-hover: 0 12px 30px rgba(0, 0, 0, 0.62);
    --ambient-opacity: 0.32;

    --scroll-thumb: rgba(255, 255, 255, 0.16);
    --scroll-thumb-hover: rgba(255, 255, 255, 0.3);

    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0b0d10;
  --bg-card: #13161b;
  --bg-elevated: #161a20;
  --bg-glass: rgba(11, 13, 16, 0.88);
  --bg-subtle: #161a20;
  --bg-chip: #1c2129;
  --bg-chip-hover: #262c36;
  --bg-hover: #191d23;
  --border: #262c36;
  --text: #f1f1f1;
  --text-2: #aaaaaa;
  --text-3: #757575;
  --brand: #fb923c;
  --brand-mark: #ff6600;
  --avatar-l-bg: 24%;
  --avatar-l-fg: 82%;

  --border-subtle: rgba(255, 255, 255, 0.07);
  --glass-border: rgba(255, 255, 255, 0.1);
  --card-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.08);
  --card-shadow: 0 4px 16px rgba(0, 0, 0, 0.45);
  --card-shadow-hover: 0 12px 30px rgba(0, 0, 0, 0.62);
  --ambient-opacity: 0.32;

  --scroll-thumb: rgba(255, 255, 255, 0.16);
  --scroll-thumb-hover: rgba(255, 255, 255, 0.3);

  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

h1,
h2,
h3,
p {
  margin: 0;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  transform: translateY(-160%);
}

.skip-link:focus-visible {
  transform: none;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--text);
  flex: none;
}

.icon-btn:hover {
  background: var(--bg-hover);
}

.theme-icon-sun {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-icon-moon {
    display: none;
  }

  :root:not([data-theme="light"]) .theme-icon-sun {
    display: block;
  }
}

:root[data-theme="dark"] .theme-icon-moon {
  display: none;
}

:root[data-theme="dark"] .theme-icon-sun {
  display: block;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 36px;
  padding: 0 16px;
  border: 1px solid var(--border);
  border-radius: var(--pill);
  background: var(--bg-card);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
}

.btn:hover {
  background: var(--bg-hover);
}

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

.btn.is-on {
  border-color: var(--text);
  background: var(--text);
  color: var(--bg);
}

.chip {
  height: 32px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-chip);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
}

.chip:hover {
  background: var(--bg-chip-hover);
}

.chip[aria-pressed="true"] {
  border-color: var(--text);
  background: var(--text);
  color: var(--bg);
}

.avatar {
  --avatar-hue: 210;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  flex: none;
  background: hsl(var(--avatar-hue) 62% var(--avatar-l-bg));
  color: hsl(var(--avatar-hue) 48% var(--avatar-l-fg));
  font-size: 14px;
  font-weight: 600;
  user-select: none;
}

/* Compact channel mark used inline in feed card meta rows */
.avatar.xs {
  width: 18px;
  height: 18px;
  border-radius: 5px;
  font-size: 10.5px;
  font-weight: 700;
}

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

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 60;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--text);
  color: var(--bg);
  font-size: 13px;
  transform: translateX(-50%);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

/* Slim, rounded scrollbars. Chromium ignores ::-webkit-scrollbar as soon as
   scrollbar-width/scrollbar-color are set, so the Firefox fallback is scoped. */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  border: 3px solid transparent;
  border-radius: var(--pill);
  background: var(--scroll-thumb);
  background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--scroll-thumb-hover);
  background-clip: padding-box;
}

::-webkit-scrollbar-corner {
  background: transparent;
}

@supports not selector(::-webkit-scrollbar) {
  html,
  .sidebar,
  .transcript-list {
    scrollbar-width: thin;
    scrollbar-color: var(--scroll-thumb) transparent;
  }
}

@keyframes view-enter {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .feed:not(.is-skeleton) .grid,
  .watch-main,
  .related,
  .comments {
    animation: view-enter 0.2s var(--ease);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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