:root {
  color-scheme: dark;
  --demos-bg: #131518;
  --demos-panel: #1c1f24;
  --demos-panel-active: #242830;
  --demos-border: #2c313a;
  --demos-border-active: #404856;
  --demos-text: #e6edf3;
  --demos-text-muted: #8b949e;
  --demos-accent: #58a6ff;
  --demos-negative: #f85149;
  --demos-font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

body {
  margin: 0;
  font-family: var(--font-sans, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif);
  background: var(--demos-bg);
  color: var(--demos-text);
  line-height: 1.5;
}

.muted {
  color: var(--demos-text-muted);
  font-weight: normal;
}

.demos-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 24px;
  background: var(--demos-bg);
  border-bottom: 1px solid var(--demos-border);

  h1 {
    margin: 0;
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    font-family: var(--demos-font-mono);
    text-transform: lowercase;
  }
  .scroll-top-btn {
    margin: 0;
    padding: 0;
    border: 0;
    border-radius: 4px;
    background: none;
    color: inherit;
    font: inherit;
    letter-spacing: inherit;
    text-transform: inherit;
    cursor: pointer;
    user-select: none;
    transition: color 0.15s;

    &:hover {
      color: var(--demos-accent);
    }
  }

  .header-filters {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-inline-start: auto;
    flex-wrap: wrap;
  }

  input {
    padding: 6px 10px;
    background: var(--demos-panel);
    border: 1px solid var(--demos-border);
    border-radius: 6px;
    color: var(--demos-text);
    font: inherit;
    font-size: 0.82rem;
    font-family: var(--demos-font-mono);
    transition: border-color 0.15s;

    &:focus {
      border-color: var(--demos-accent);
    }

    &::placeholder {
      color: var(--demos-text-muted);
      opacity: 0.8;
    }
  }

  #demo-filter {
    width: 170px;
  }

  #feature-filter {
    width: 200px;
  }

  a {
    text-decoration: none;
    font-size: 0.88rem;
    padding: 4px 8px;
    border-radius: 4px;
    font-family: var(--demos-font-mono);
    transition: color 0.15s, background-color 0.15s;

    &:hover {
      color: var(--demos-text);
      background: var(--demos-panel);
    }

    &:active {
      background: var(--demos-panel-active);
      color: var(--demos-accent);
    }
  }
}

/* Table of Contents */
.toc {
  padding: 18px 24px 22px;
  border-bottom: 1px solid var(--demos-border);
  background: var(--demos-bg);
}

.toc-grid {
  columns: 6 200px;
  column-gap: 24px;
}

.toc-col {
  break-inside: avoid;
  margin-bottom: 18px;
}

.toc-cat-header {
  font-family: var(--demos-font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--demos-accent);
  text-transform: lowercase;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--demos-border);
  display: block;
  text-decoration: none;
  transition: color 0.12s, border-color 0.12s;

  &:hover {
    color: var(--demos-text);
    border-color: var(--demos-border-active);
  }

  &:active {
    color: var(--demos-accent);
    transform: scale(0.98);
  }
}

.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.toc-link {
  font-family: var(--demos-font-mono);
  font-size: 0.73rem;
  color: var(--demos-text-muted);
  text-decoration: none;
  display: block;
  padding: 1px 4px;
  border-radius: 3px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color 0.12s, background-color 0.12s, transform 0.1s;

  &:hover {
    color: var(--demos-text);
    background: var(--demos-panel);
  }

  &:active {
    color: var(--demos-accent);
    background: var(--demos-panel-active);
    transform: scale(0.97);
  }

  &.active {
    color: var(--demos-accent);
    background: rgba(88, 166, 255, 0.12);
  }
}

main {
  padding: 8px 24px 64px;
}

.category {
  scroll-margin-top: 60px;

  h2 {
    margin: 32px 0 16px;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: lowercase;
    letter-spacing: 0.06em;
    font-family: var(--demos-font-mono);
    color: var(--demos-text-muted);
    border-bottom: 1px solid var(--demos-border);
    padding-bottom: 6px;
  }
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(440px, 100%), 1fr));
  gap: 20px;
}

.card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--demos-border);
  border-radius: 8px;
  background: var(--demos-panel);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  scroll-margin-top: 64px;
  transition: border-color 0.15s, box-shadow 0.15s, outline 0.15s;
  /* 420px content-box = 110px .card-header + 310px .iframe-container (exact across OS font metrics). */
  content-visibility: auto;
  contain-intrinsic-size: auto 420px;

  &:hover {
    border-color: var(--demos-border-active);
  }

  &:target {
    outline: 2px solid var(--demos-accent);
    outline-offset: 3px;
    border-color: var(--demos-accent);
    box-shadow: 0 0 24px rgba(88, 166, 255, 0.4);
    animation: target-pulse 1.8s ease-out;

    .guide-id {
      color: var(--demos-accent);
    }
  }

  &.showing-unset {
    border-color: rgba(248, 81, 73, 0.5);
  }

  &.expanded {
    .card-header {
      height: auto;
    }

    .card-desc {
      height: auto;
      display: block;
      -webkit-line-clamp: unset;
      overflow: visible;
    }

    .card-features {
      height: auto;
      overflow: visible;
    }
  }
}

@keyframes target-pulse {
  0% {
    box-shadow: 0 0 36px rgba(88, 166, 255, 0.85);
  }
  100% {
    box-shadow: 0 0 24px rgba(88, 166, 255, 0.4);
  }
}

.card-header {
  height: 110px;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px 12px 10px;
  background: var(--demos-panel);
  border-bottom: 1px solid var(--demos-border);
  cursor: pointer;
  user-select: none;

  .card-header-top {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
  }

  .guide-id {
    flex: 1;
    min-inline-size: 0;
    margin: 0;
    padding: 0;
    border: 0;
    background: none;
    text-align: start;
    line-height: inherit;
    cursor: pointer;
    font-family: var(--demos-font-mono);
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--demos-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: color 0.15s;
  }

  .card-desc {
    height: 2.7em;
    font-size: 0.76rem;
    color: var(--demos-text-muted);
    line-height: 1.35;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    user-select: text;
  }

  .card-features {
    height: 22px;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 2px;
    overflow: hidden;
  }

  .feature-tag {
    font-family: var(--demos-font-mono);
    font-size: 0.68rem;
    color: var(--demos-text-muted);
    background: var(--demos-bg);
    border: 1px solid var(--demos-border);
    border-radius: 3px;
    padding: 1px 6px;
    cursor: pointer;
    line-height: 1.4;
    transition: color 0.12s, border-color 0.12s, background-color 0.12s;

    &:hover {
      color: var(--demos-accent);
      border-color: var(--demos-border-active);
    }

    &.active {
      color: #ffffff;
      background: rgba(88, 166, 255, 0.25);
      border-color: var(--demos-accent);
      font-weight: 600;
    }
  }

  .toggle-group {
    display: inline-flex;
    background: var(--demos-bg);
    border: 1px solid var(--demos-border);
    border-radius: 4px;
    padding: 2px;
    gap: 2px;
  }

  .toggle-btn {
    background: transparent;
    border: 0;
    padding: 2px 8px;
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--demos-text-muted);
    border-radius: 3px;
    cursor: pointer;
    transition: background 0.12s, color 0.12s, transform 0.1s;

    &:hover {
      color: var(--demos-text);
    }

    &:active {
      transform: scale(0.96);
    }

    &.active {
      background: var(--demos-panel-active);
      color: var(--demos-text);
      font-weight: 600;

      &.unset {
        color: var(--demos-negative);
      }
    }
  }

  .open-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--demos-text-muted);
    padding: 4px;
    border-radius: 4px;
    text-decoration: none;
    transition: color 0.15s, background-color 0.15s, transform 0.1s;

    &:hover {
      color: var(--demos-accent);
      background: var(--demos-panel-active);
    }

    &:active {
      color: var(--demos-text);
      transform: scale(0.92);
    }

    svg {
      display: block;
      width: 14px;
      height: 14px;
    }
  }
}

.iframe-container {
  width: 100%;
  height: 310px;
  overflow: hidden;
  background: #ffffff;
  position: relative;

  iframe {
    width: 125%;
    height: 125%;
    border: 0;
    transform: scale(0.8);
    transform-origin: 0 0;
    background: #ffffff;
  }
}

.no-results {
  padding: 64px 24px;
  text-align: center;
  color: var(--demos-text-muted);
  font-family: var(--demos-font-mono);
  font-size: 0.95rem;
}

[hidden] {
  display: none !important;
}
:is(a, button, input, [tabindex]):focus-visible { outline: 2px solid var(--demos-accent); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
.card:target { animation: none; }
:is(.toc-cat-header, .toc-link, .toggle-btn, .open-link):active { transform: none; }
}