:root {
  --bg-base: #181818;
  --bg-raised: #1a1a1a;
  --bg-surface: #1e1e1e;
  --bg-card: #252525;
  --bg-input: #2a2a2a;
  --bg-hover: #3a3a3a;
  --border: #333333;
  --border-input: #444444;
  --fg-primary: #dddddd;
  --fg-secondary: #bbbbbb;
  --fg-muted: #888888;
  --fg-dim: #666666;
  --accent-amber: #e0a020;
  --accent-blue: #4a9eff;
  --state-go: #2d7a2d;
  --state-stop: #444444;
  --state-panic: #7a2d2d;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13px;
  color: var(--fg-primary);
  background: radial-gradient(1200px 600px at 85% -20%, rgba(74, 158, 255, 0.16), transparent),
    radial-gradient(900px 500px at -20% 10%, rgba(224, 160, 32, 0.12), transparent),
    var(--bg-base);
  line-height: 1.45;
  overflow-x: hidden;
}

.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 20px 20px;
  mask-image: radial-gradient(circle at center, black 45%, transparent 90%);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(24, 24, 24, 0.9);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 10px 18px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 18px;
  align-items: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-amber);
  text-decoration: none;
  letter-spacing: 0.08em;
  font-weight: 700;
}

.brand-mark {
  width: 24px;
  height: 24px;
}

.top-nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.top-nav a {
  color: var(--fg-secondary);
  text-decoration: none;
  padding: 6px 10px;
  border: 1px solid transparent;
  border-radius: 999px;
  transition: 0.1s ease;
}

.top-nav a:hover {
  color: var(--fg-primary);
  border-color: var(--border-input);
  background: rgba(255, 255, 255, 0.04);
}

.donate-btn {
  text-decoration: none;
  color: #111;
  background: var(--accent-amber);
  border: 1px solid color-mix(in srgb, var(--accent-amber) 70%, #fff 30%);
  font-weight: 700;
  letter-spacing: 0.03em;
  padding: 10px 14px;
  border-radius: 4px;
  transition: transform 0.08s ease, filter 0.08s ease;
  white-space: nowrap;
}

.donate-btn:hover {
  filter: brightness(1.08);
}

.donate-btn:active {
  transform: translateY(1px);
}

.layout {
  max-width: 1180px;
  margin: 26px auto 36px;
  padding: 0 18px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.panel {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.015), rgba(255, 255, 255, 0)), var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 18px;
}

.hero {
  grid-column: 1 / -1;
  padding: 24px;
}

.hero-logo {
  width: min(420px, 100%);
  height: auto;
  opacity: 0.96;
  margin-bottom: 12px;
}

h1,
h2,
h3 {
  margin: 0 0 8px;
}

h1 {
  font-size: clamp(24px, 4vw, 36px);
  letter-spacing: 0.02em;
}

h2 {
  font-size: 18px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-secondary);
}

h3 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--fg-secondary);
}

p {
  margin: 0 0 10px;
  color: var(--fg-secondary);
}

.hero-actions {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.action {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0 14px;
  border-radius: 4px;
  border: 1px solid var(--border-input);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 12px;
}

.action-primary {
  color: #111;
  background: var(--accent-blue);
  border-color: var(--accent-blue);
}

.action-ghost {
  color: var(--fg-primary);
  background: var(--bg-input);
}

.action:hover {
  filter: brightness(1.07);
}

.hero-note {
  margin-top: 10px;
  color: var(--fg-dim);
}

.toc {
  grid-column: 2;
  grid-row: 2 / span 4;
  height: fit-content;
  position: sticky;
  top: 76px;
}

.toc ol {
  margin: 10px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
}

.toc a {
  color: var(--fg-secondary);
  text-decoration: none;
}

.toc a:hover {
  color: var(--accent-blue);
}

.steps {
  margin: 8px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
}

.cards {
  display: grid;
  gap: 10px;
}

.two-col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.three-col {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-input);
  border-radius: 4px;
  padding: 12px;
}

.state-go {
  border-color: color-mix(in srgb, var(--state-go) 75%, #fff 25%);
}

.state-stop {
  border-color: color-mix(in srgb, var(--state-stop) 75%, #fff 25%);
}

.state-panic {
  border-color: color-mix(in srgb, var(--state-panic) 75%, #fff 25%);
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border-input);
  border-radius: 4px;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
}

thead th {
  background: var(--bg-raised);
  color: var(--fg-muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th,
td {
  padding: 10px 12px;
}

tbody tr {
  border-bottom: 1px solid var(--border);
}

tbody tr:last-child {
  border-bottom: none;
}

tbody tr:hover {
  background: rgba(74, 158, 255, 0.08);
}

.kbd-grid {
  margin-top: 12px;
  display: grid;
  gap: 8px;
}

.kbd-grid > div {
  display: flex;
  gap: 6px;
  align-items: center;
  color: var(--fg-secondary);
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 24px;
  border-radius: 4px;
  border: 1px solid var(--border-input);
  background: var(--bg-input);
  color: var(--fg-primary);
  font-size: 11px;
  font-weight: 700;
  padding: 0 6px;
}

.tight-list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
}

.faq-list {
  display: grid;
  gap: 10px;
}

.cheat-sheet {
  background: linear-gradient(180deg, rgba(224, 160, 32, 0.08), rgba(224, 160, 32, 0.02));
  border: 1px solid color-mix(in srgb, var(--accent-amber) 50%, var(--border) 50%);
  border-radius: 4px;
  padding: 12px;
  display: grid;
  gap: 10px;
}

.cheat-sheet h3 {
  margin: 0;
  color: var(--accent-amber);
}

.download-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 24px 12px;
  text-align: center;
}

.download-card h3 {
  margin: 0;
}

.download-card .action {
  width: 100%;
}

.platform-icon {
  width: 48px;
  height: 48px;
  color: var(--fg-muted);
  display: flex;
  align-items: center;
  justify-content: center;
}

.platform-icon svg {
  width: 100%;
  height: 100%;
}

.changelog-list {
  display: grid;
  gap: 10px;
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--fg-dim);
  padding: 14px 18px 24px;
  text-align: center;
}

.reveal {
  opacity: 0;
  transform: translateY(8px);
  animation: reveal 0.45s ease forwards;
}

.delay-1 { animation-delay: 0.07s; }
.delay-2 { animation-delay: 0.14s; }
.delay-3 { animation-delay: 0.21s; }
.delay-4 { animation-delay: 0.28s; }

@keyframes reveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .header-inner {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .layout {
    grid-template-columns: 1fr;
  }

  .toc {
    grid-column: 1;
    grid-row: auto;
    position: static;
  }

  .two-col,
  .three-col {
    grid-template-columns: 1fr;
  }
}

@media print {
  .site-header,
  .site-footer,
  .toc,
  .hero,
  #download,
  #layout,
  #workflow,
  #cue-types,
  #transport,
  #file-ops,
  #changelog,
  #faq {
    display: none;
  }

  body {
    background: #ffffff;
    color: #000000;
  }

  .layout {
    display: block;
    margin: 0;
    padding: 0;
  }

  #cheat-sheet {
    border: none;
    background: #ffffff;
    padding: 0;
  }

  .cheat-sheet {
    background: #ffffff;
    border: 1px solid #000000;
  }

  .cheat-sheet h3,
  .cheat-sheet p,
  .cheat-sheet li {
    color: #000000;
  }
}