:root {
  --accent-text: var(--accent);
  --body-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 320px), var(--ink);
  --nav-bg: rgba(8, 9, 11, 0.86);
  --button-secondary-bg: rgba(255, 255, 255, 0.03);
  --button-secondary-hover: rgba(255, 255, 255, 0.08);
  --control-bg: rgba(255, 255, 255, 0.04);
  --card-bg: rgba(255, 255, 255, 0.055);
  --popover-bg: #0c0d12;
  --table-bg: rgba(0, 0, 0, 0.28);
  --code-bg: #050609;
  --pill-bg: rgba(0, 0, 0, 0.26);
  --hero-filter: brightness(0.62) saturate(0.92);
  --hero-scrim:
    linear-gradient(90deg, rgba(3, 3, 4, 0.99) 0%, rgba(3, 3, 4, 0.96) 44%, rgba(3, 3, 4, 0.62) 70%, rgba(3, 3, 4, 0.12) 100%),
    linear-gradient(0deg, rgba(3, 3, 4, 0.82), rgba(3, 3, 4, 0.22) 48%, rgba(3, 3, 4, 0.38));
  --stage-copy-bg: transparent;
  --permission-bg:
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(180deg, #030304 0%, #090a0e 54%, #030304 100%);
  --permission-meta-bg:
    linear-gradient(135deg, rgba(140, 196, 255, 0.1), transparent 58%),
    rgba(255, 255, 255, 0.045);
  --permission-visual-bg: linear-gradient(180deg, rgba(140, 196, 255, 0.08), transparent 44%), #0a0b0f;
  --callout-bg: linear-gradient(135deg, rgba(140, 196, 255, 0.12), transparent 42%), var(--card-bg);
}

:root[data-theme="light"] {
  color-scheme: light;
  --ink: #f4f7fc;
  --ink-2: #f9fbff;
  --surface: rgba(19, 31, 48, 0.05);
  --surface-strong: rgba(19, 31, 48, 0.1);
  --surface-solid: #ffffff;
  --text: #121b28;
  --text-soft: #3d4b5f;
  --muted: #65748a;
  --muted-2: #7f8da2;
  --line: rgba(19, 31, 48, 0.14);
  --line-strong: rgba(19, 31, 48, 0.24);
  --accent: #2d6fbb;
  --accent-text: #245d9d;
  --accent-ink: #eff6ff;
  --cyan: #007c9f;
  --green: #197a37;
  --purple: #a842b4;
  --danger: #be3046;
  --shadow-soft: 0 24px 70px rgba(50, 44, 26, 0.16);
  --shadow-hard: 0 18px 60px rgba(49, 42, 22, 0.22);
  --body-bg: linear-gradient(180deg, rgba(45, 111, 187, 0.08), transparent 320px), var(--ink);
  --nav-bg: rgba(244, 247, 252, 0.9);
  --button-secondary-bg: rgba(19, 31, 48, 0.05);
  --button-secondary-hover: rgba(19, 31, 48, 0.09);
  --control-bg: rgba(19, 31, 48, 0.045);
  --card-bg: rgba(255, 255, 255, 0.62);
  --popover-bg: #fffdf7;
  --table-bg: rgba(255, 255, 255, 0.7);
  --code-bg: #eff6ff;
  --pill-bg: rgba(19, 31, 48, 0.06);
  --stage-copy-bg: transparent;
  --permission-bg:
    linear-gradient(90deg, rgba(19, 31, 48, 0.055) 1px, transparent 1px),
    linear-gradient(rgba(19, 31, 48, 0.055) 1px, transparent 1px),
    linear-gradient(180deg, #f4f7fc 0%, #f9fbff 52%, #f4f7fc 100%);
  --permission-meta-bg:
    linear-gradient(135deg, rgba(45, 111, 187, 0.18), transparent 58%),
    rgba(255, 255, 255, 0.66);
  --permission-visual-bg: linear-gradient(180deg, rgba(45, 111, 187, 0.16), transparent 44%), #fffdf7;
  --callout-bg: linear-gradient(135deg, rgba(45, 111, 187, 0.2), transparent 42%), var(--card-bg);
}

body {
  background: var(--body-bg);
}

.site-nav {
  flex-wrap: wrap;
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
}

.theme-switcher {
  display: inline-grid;
  grid-template-columns: repeat(3, auto);
  gap: 2px;
  flex: none;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}

.theme-switcher button {
  min-height: 34px;
  border: 0;
  border-radius: 7px;
  padding: 0 10px;
  color: var(--text-soft);
  background: transparent;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
}

.theme-switcher button:hover {
  color: var(--text);
  background: var(--surface-strong);
}

.theme-switcher button[aria-pressed="true"] {
  color: var(--accent-ink);
  background: var(--accent);
}

.eyebrow,
.back-link,
code,
.stage-index,
.principle-card span {
  color: var(--accent-text);
}

.button-secondary {
  background: var(--button-secondary-bg);
}

.button-secondary:hover {
  background: var(--button-secondary-hover);
}

table {
  background: var(--table-bg);
}

.code {
  background: var(--code-bg);
}

.home-hero {
  background: transparent;
  color: inherit;
}

.hero-media {
  filter: var(--hero-filter);
}

.hero-scrim {
  background: var(--hero-scrim);
}

.stage-copy {
  background: transparent;
}

.stage-tags span,
.intro-marks span {
  background: var(--pill-bg);
}

.language-switcher__panel,
.home-language .language-switcher__panel {
  background: var(--popover-bg);
}

.site-nav .site-language {
  position: relative;
  flex: none;
}

.site-nav .site-language > summary {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0 12px;
  color: var(--text-soft);
  background: var(--surface);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
}

.site-nav .site-language > summary::before {
  content: "文/A";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 16px;
  padding: 0 3px;
  border: 1px solid currentColor;
  border-radius: 4px;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  opacity: 0.88;
}

.site-nav .site-language > summary::after {
  content: "";
  width: 6px;
  height: 6px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
}

.site-nav .site-language > summary::-webkit-details-marker {
  display: none;
}

.site-nav .site-language .language-switcher__panel {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 60;
  width: min(210px, calc(100vw - 28px));
  display: grid;
  gap: 6px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--popover-bg);
  box-shadow: var(--shadow-soft);
}

.site-nav .site-language:not([open]) .language-switcher__panel {
  display: none;
}

.site-nav .site-language .language-switcher__panel button {
  min-height: 40px;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0 12px;
  color: var(--text-soft);
  background: transparent;
  text-align: left;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
}

.site-nav .site-language .language-switcher__panel button:hover,
.site-nav .site-language .language-switcher__panel button[aria-pressed="true"] {
  border-color: var(--line);
  background: var(--surface-strong);
  color: var(--text);
}

.page-permissions {
  background: var(--permission-bg);
}

.permission-segments {
  background: var(--control-bg);
}

.permission-summary,
.permission-visual,
.permission-detail,
.permission-callout {
  background: var(--card-bg);
}

.permission-meta {
  background: var(--permission-meta-bg);
}

.permission-visual {
  background: var(--permission-visual-bg);
}

.permission-callout {
  background: var(--callout-bg);
}

@media (max-width: 700px) {
  .theme-switcher {
    order: 10;
    width: 100%;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .theme-switcher button {
    min-height: 36px;
    padding: 0 6px;
  }

  .site-nav .site-language > summary {
    max-width: 104px;
    padding: 0 10px;
  }

  .site-nav .site-language [data-active-language] {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .site-nav .site-language .language-switcher__panel {
    right: auto;
    left: 0;
  }
}

.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  padding: 0 16px 20px;
  pointer-events: none;
  transform: translateY(0);
  transition: transform 400ms var(--ease), opacity 400ms var(--ease);
}

.cookie-banner:not(.is-visible) {
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
}

.cookie-banner.is-visible {
  pointer-events: auto;
}

.cookie-banner__body {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: 780px;
  padding: 14px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--popover-bg);
  box-shadow: var(--shadow-hard);
}

.cookie-banner__text {
  margin: 0;
  color: var(--text-soft);
  font-size: 13px;
  line-height: 1.5;
  flex: 1;
}

.cookie-banner__text a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.cookie-banner__actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.cookie-banner__btn {
  min-height: 34px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 180ms var(--ease), border-color 180ms var(--ease);
}

.cookie-banner__btn-primary {
  color: var(--accent-ink);
  background: var(--accent);
  border-color: var(--accent);
}

.cookie-banner__btn-primary:hover {
  filter: brightness(1.1);
}

.cookie-banner__btn-secondary {
  color: var(--text-soft);
  background: transparent;
}

.cookie-banner__btn-secondary:hover {
  color: var(--text);
  border-color: var(--line-strong);
  background: var(--surface-strong);
}

@media (max-width: 640px) {
  .cookie-banner__body {
    flex-direction: column;
    gap: 12px;
    padding: 16px;
    text-align: center;
  }

  .cookie-banner__actions {
    width: 100%;
    justify-content: center;
  }
}

[data-theme="light"] .cookie-banner__body {
  background: #ffffff;
  border-color: var(--line-strong);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
}