:root {
  --bg: #050911;
  --panel: #0c1220;
  --panel-strong: #11192b;
  --border: #1d2840;
  --text: #e7ecf5;
  --muted: #9fb3d3;
  --accent: #7ee0ff;
  --accent-2: #8ff0c5;
  --shadow: 0 20px 70px rgba(0,0,0,0.45);
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--sans);
  background: radial-gradient(circle at 20% 20%, rgba(126, 224, 255, 0.07), transparent 28%), radial-gradient(circle at 80% 0%, rgba(143, 240, 197, 0.06), transparent 24%), var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.background-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(900px 900px at 10% 0%, rgba(126, 224, 255, 0.10), transparent 60%), radial-gradient(700px 700px at 80% 10%, rgba(143, 240, 197, 0.10), transparent 55%);
  filter: blur(18px);
  opacity: 0.65;
  z-index: 0;
}

.brand__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 0 8px rgba(126, 224, 255, 0.12);
}

.topbar {
  z-index: 50;
}
.topbar__panel {
  margin-top: 12px;
}
.topbar__toggle {
  width: 42px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(12, 18, 32, 0.8);
  display: grid;
  align-content: center;
  gap: 6px;
  padding: 0 12px;
}
.topbar__toggle-line {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text);
  border-radius: 999px;
}
.topbar__overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 40;
}

.topbar__link {
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 12px;
  border: 1px solid transparent;
  text-decoration: none;
  transition: all 0.15s ease;
}
.topbar__link:hover, .topbar__link.active {
  color: var(--text);
  border-color: var(--border);
  background: rgba(17, 25, 43, 0.9);
}

.search {
  position: relative;
}
.search__results {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 8px;
  display: grid;
  gap: 6px;
  z-index: 20;
}
.search__result {
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}
.search__result:hover {
  background: var(--panel-strong);
  border-color: var(--border);
}
.search__result-tag {
  padding: 4px 8px;
  border-radius: 999px;
  background: rgba(126, 224, 255, 0.12);
  color: var(--accent);
  font-size: 0.85rem;
}
.search__empty {
  color: var(--muted);
  padding: 8px 4px;
  font-size: 0.9rem;
}

.hero__meta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
.pill {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(17, 25, 43, 0.85);
  border: 1px solid var(--border);
  color: var(--accent);
  font-weight: 600;
}
.pill--quiet { color: var(--muted); }

.layout { position: relative; z-index: 1; }

.toc {
  position: sticky;
  top: 16px;
  align-self: start;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 16px;
  box-shadow: var(--shadow);
}
.toc__title {
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}
.toc nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.toc__link {
  color: var(--muted);
  text-decoration: none;
  padding: 6px 8px;
  border-radius: 10px;
  transition: all 0.15s ease;
  display: block;
}
.toc__link:hover, .toc__link.active {
  background: var(--panel-strong);
  color: var(--text);
  border: 1px solid var(--border);
}
.toc__link.level-1 { font-weight: 700; color: var(--text); }
.toc__link.level-2 { padding-left: 12px; }
.toc__link.level-3 { padding-left: 22px; font-size: 0.95rem; }
.toc__cta {
  margin-top: 14px;
  padding: 12px;
  border-radius: 12px;
  background: linear-gradient(120deg, rgba(126, 224, 255, 0.18), rgba(143, 240, 197, 0.16));
  color: #041224;
}
.toc__cta-title {
  font-weight: 700;
  margin-bottom: 6px;
  color: #041224;
}
.toc__cta code {
  background: rgba(4, 18, 36, 0.15);
  padding: 4px 6px;
  border-radius: 8px;
  font-family: var(--mono);
}

.content {
  background: rgba(12, 18, 32, 0.8);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  box-shadow: var(--shadow);
}
.intro-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}
.card {
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  min-height: 170px;
}
.card__label {
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}
.card h3 {
  margin: 8px 0;
  font-size: 1.15rem;
}
.card p {
  margin: 0;
  color: var(--muted);
}

.doc-body {
  line-height: 1.65;
  color: var(--text);
}
.doc-body h1, .doc-body h2, .doc-body h3, .doc-body h4 {
  margin-top: 24px;
  color: var(--text);
  letter-spacing: -0.01em;
}
.doc-body h3 { color: var(--accent); }
.doc-body p { color: var(--muted); }
.doc-body ul { padding-left: 22px; color: var(--muted); }
.doc-body code {
  background: rgba(17, 25, 43, 0.9);
  padding: 3px 6px;
  border-radius: 8px;
  font-family: var(--mono);
  color: var(--accent);
}
.doc-body pre {
  background: #050b16;
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 14px;
  overflow: auto;
  position: relative;
}
.doc-body pre code {
  display: block;
  color: #b7c9f1;
  font-size: 0.95rem;
}
.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 6px 10px;
  font-family: var(--mono);
  cursor: pointer;
  transition: all 0.15s ease;
}
.copy-btn:hover { background: rgba(255,255,255,0.12); }

.footer {
  position: relative;
  z-index: 1;
  padding: 32px 8vw 48px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border);
  margin-top: 24px;
}
.footer__links {
  display: flex;
  gap: 10px;
  align-items: center;
}
.footer a { color: var(--accent); text-decoration: none; }
.footer a:hover { text-decoration: underline; }

@media (max-width: 980px) {
  .toc {
    position: relative;
    top: 0;
    order: 2;
  }
  .content {
    order: 1;
  }
}

@media (max-width: 640px) {
  .footer { flex-direction: column; gap: 8px; align-items: flex-start; }
}