:root {
  color-scheme: light;
  --bg-page: #f6f7fb;
  --bg-panel: #ffffff;
  --bg-panel-soft: #f0f6f4;
  --bg-sidebar: #101820;
  --bg-sidebar-2: #17212b;
  --sidebar-width: 292px;
  --text-primary: #17212b;
  --text-muted: #5c6a73;
  --text-inverse: #f8fbff;
  --accent: #0d9488;
  --accent-strong: #0f4f64;
  --accent-2: #3559e0;
  --accent-warm: #c36a1d;
  --accent-soft: #e4f4f1;
  --border: #dce4ea;
  --border-strong: #b9c7d1;
  --shadow-soft: 0 16px 34px rgba(17, 24, 39, 0.10);
  --shadow-card: 0 2px 12px rgba(17, 24, 39, 0.06);
  --code-bg: #111827;
  --code-border: #2f3b4a;
  --radius-lg: 8px;
  --radius-md: 8px;
  --radius-sm: 6px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(90deg, rgba(13, 148, 136, 0.05) 1px, transparent 1px),
    linear-gradient(180deg, rgba(53, 89, 224, 0.04) 1px, transparent 1px),
    var(--bg-page);
  background-size: 48px 48px;
  color: var(--text-primary);
  font-family: Inter, "Aptos", "Segoe UI", Tahoma, sans-serif;
  line-height: 1.62;
}

*::selection {
  background: #d9ebe8;
}

a {
  color: var(--accent-strong);
  font-weight: 700;
  text-decoration-color: rgba(13, 148, 136, 0.35);
  text-underline-offset: 0.18em;
}

a:hover,
a:focus {
  color: var(--accent);
  text-decoration-color: currentColor;
}

.site {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  overflow: auto;
  padding: 1.2rem 1rem 1.5rem;
  color: var(--text-inverse);
  background:
    linear-gradient(180deg, var(--bg-sidebar), var(--bg-sidebar-2));
  border-right: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 12px 0 36px rgba(17, 24, 39, 0.18);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.65rem;
}

.brand-logo {
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  border-radius: var(--radius-md);
}

.brand-logo--hero {
  width: 52px;
  height: 52px;
}

.logo h1 {
  margin: 0;
  font-size: 1.02rem;
  letter-spacing: 0;
}

.sidebar small {
  display: block;
  color: rgba(248, 251, 255, 0.72);
  line-height: 1.45;
  margin-bottom: 1.1rem;
}

.nav-group {
  margin-top: 1.15rem;
}

.nav-group h2 {
  margin: 0 0 0.45rem;
  color: rgba(248, 251, 255, 0.56);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  display: block;
  padding: 0.46rem 0.62rem;
  color: rgba(248, 251, 255, 0.88);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-size: 0.93rem;
  font-weight: 650;
}

.nav-list a:hover,
.nav-list a:focus,
.nav-list a.active,
.nav-list a[aria-current="page"] {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
}

.content {
  width: min(1260px, 100%);
  margin: 0 auto;
  padding: 1.7rem clamp(1rem, 3vw, 2.8rem) 3.4rem;
}

.breadcrumb {
  margin-bottom: 0.85rem;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 750;
  letter-spacing: 0.03em;
}

.page-brand {
  display: none;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.35rem, 3vw, 2.6rem);
  margin-bottom: 1.1rem;
  color: #f8fbff;
  background:
    linear-gradient(135deg, rgba(16, 24, 32, 0.97), rgba(15, 79, 100, 0.96)),
    #101820;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 auto;
  width: 44%;
  height: 100%;
  background:
    linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.06)),
    repeating-linear-gradient(0deg, transparent 0 21px, rgba(255, 255, 255, 0.08) 22px),
    repeating-linear-gradient(90deg, transparent 0 21px, rgba(255, 255, 255, 0.07) 22px);
  opacity: 0.75;
  pointer-events: none;
}

.hero > * {
  position: relative;
  z-index: 1;
}

.hero h1,
.content h1,
.content h2,
.content h3,
.content h4 {
  font-family: "Aptos Display", Inter, "Segoe UI", Tahoma, sans-serif;
  line-height: 1.12;
  letter-spacing: 0;
}

.hero h1,
.content > h1 {
  max-width: 980px;
  margin: 0.55rem 0 0.8rem;
  font-size: clamp(1.9rem, 4vw, 3.25rem);
}

.hero p {
  max-width: 76ch;
  color: rgba(248, 251, 255, 0.86);
}

.content h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.3rem, 2.2vw, 1.95rem);
}

.content h3 {
  margin: 0 0 0.45rem;
  font-size: 1.08rem;
}

.card,
.action-card,
.stat-card,
.highlight-card,
.diagram-card,
.api-section,
.stage-card,
.code-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.card,
.diagram-card,
.api-section {
  padding: clamp(1rem, 2vw, 1.5rem);
  margin: 1rem 0;
}

.card > p,
.diagram-card > p {
  max-width: 78ch;
}

.panel-grid,
.quick-links,
.concept-grid,
.stat-grid,
.module-grid,
.stage-grid,
.code-grid {
  display: grid;
  gap: 1rem;
}

.panel-grid,
.quick-links,
.module-grid {
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.concept-grid,
.stat-grid,
.stage-grid,
.code-grid {
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
}

.action-card,
.stat-card,
.highlight-card,
.stage-card,
.code-card {
  padding: 1rem;
}

.highlight-card,
.code-card {
  background: var(--bg-panel-soft);
}

.stage-card {
  border-left: 4px solid var(--accent);
}

.stage-card h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.stage-number {
  display: inline-grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border-radius: 999px;
  color: #ffffff;
  background: var(--accent-2);
  font-size: 0.9rem;
  font-weight: 850;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0.8rem 0;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  min-height: 1.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  color: #0f4f64;
  background: #e5f0ff;
  border: 1px solid #c7d7f5;
  font-size: 0.82rem;
  font-weight: 750;
}

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius-sm);
  padding: 0.24rem 0.62rem;
  background: rgba(255, 255, 255, 0.12);
  color: #f8fbff;
  border: 1px solid rgba(255, 255, 255, 0.16);
  font-size: 0.75rem;
  font-weight: 850;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 1rem 0;
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.65rem;
  gap: 0.35rem;
  padding: 0.66rem 1rem;
  border-radius: var(--radius-sm);
  background: #ffffff;
  color: #0f4f64;
  font-weight: 850;
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.button-link:hover,
.button-link:focus {
  color: #0f4f64;
  background: #eaf6f4;
}

.button-link.secondary {
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.24);
}

.button-link.secondary:hover,
.button-link.secondary:focus {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.16);
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
  background: #ffffff;
}

th,
td {
  padding: 0.72rem 0.85rem;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

th {
  color: #143f52;
  background: #edf4ff;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

tr:last-child td {
  border-bottom: 0;
}

pre {
  position: relative;
  margin: 0.85rem 0;
  padding: 1.05rem;
  overflow: auto;
  color: #e8f5ff;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius-md);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

code {
  font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  font-size: 0.92em;
}

.code-inline,
:not(pre) > code {
  display: inline-block;
  max-width: 100%;
  overflow-wrap: anywhere;
  background: #eef4f8;
  color: #18384d;
  padding: 0.1rem 0.34rem;
  border: 1px solid #d1dce5;
  border-radius: 6px;
  font-size: 0.9em;
}

.copy-btn {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  z-index: 1;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-sm);
  padding: 0.22rem 0.55rem;
  color: #e8f5ff;
  background: rgba(255, 255, 255, 0.10);
  cursor: pointer;
  font-weight: 850;
}

.copy-btn:hover,
.copy-btn:focus {
  background: rgba(255, 255, 255, 0.2);
}

.callout {
  margin: 1rem 0;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: #f8fbfd;
}

.callout.info {
  border-color: #b7d7eb;
  background: #eef7fc;
}

.callout.tip {
  border-color: #e7c28f;
  background: #fff7ec;
}

.callout.warning {
  border-color: #e0a1a1;
  background: #fff1f1;
}

.api-signature {
  overflow-wrap: anywhere;
  font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  color: #173d4f;
  background: #eef4f8;
  border: 1px solid #d1dce5;
  border-radius: var(--radius-sm);
  padding: 0.65rem;
}

.api-section {
  overflow: hidden;
}

.api-section summary {
  cursor: pointer;
  font-weight: 850;
  color: var(--accent-strong);
}

.api-body {
  margin-top: 0.75rem;
}

.diagram-card {
  background: var(--bg-panel);
}

.diagram-card picture,
.diagram-card img,
.diagram-zoom-frame img,
.doc-figure {
  display: block;
  max-width: 100%;
}

.doc-figure {
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: #ffffff;
}

.diagram-link {
  display: inline-flex;
  margin: 0.4rem 0 0.85rem;
}

.diagram-zoom-wrap {
  margin-top: 1rem;
}

.diagram-zoom-controls {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin-bottom: 0.8rem;
}

.diagram-zoom-controls label {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text-muted);
  font-weight: 800;
}

.diagram-zoom-slider {
  accent-color: var(--accent);
}

.diagram-zoom-frame {
  overflow: auto;
  padding: 1rem;
  background: #f8fbfd;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.diagram-zoom-image {
  transform-origin: top left;
  transition: transform 120ms ease-out;
}

.stage-strip {
  display: grid;
  grid-template-columns: repeat(8, minmax(90px, 1fr));
  gap: 0.45rem;
  margin: 1rem 0;
}

.stage-strip a,
.stage-strip span {
  display: grid;
  min-height: 4.5rem;
  align-content: center;
  gap: 0.18rem;
  padding: 0.55rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #ffffff;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 750;
}

.stage-strip small {
  color: var(--text-muted);
  font-weight: 650;
}

.stage-strip a:hover,
.stage-strip a:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.14);
}

.footer {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.sidebar-toggle {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 10;
  border: 0;
  border-radius: 999px;
  padding: 0.7rem 0.95rem;
  color: #ffffff;
  background: var(--accent-strong);
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  font-weight: 850;
}

.site.sidebar-collapsed {
  grid-template-columns: 0 minmax(0, 1fr);
}

.site.sidebar-collapsed .sidebar {
  width: 0;
  min-width: 0;
  padding-inline: 0;
  border: 0;
  overflow: hidden;
}

.reveal-ready {
  opacity: 0;
  transform: translateY(8px);
  animation: reveal 360ms ease forwards;
}

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

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

  .reveal-ready {
    opacity: 1;
    transform: none;
    animation: none;
  }
}

@media (max-width: 1080px) {
  .stage-strip {
    grid-template-columns: repeat(4, minmax(90px, 1fr));
  }
}

@media (max-width: 920px) {
  .site {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: relative;
    width: 100%;
    min-width: 0;
    height: auto;
    max-height: 62vh;
  }

  .content {
    padding-top: 1rem;
  }

  .page-brand {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    margin-bottom: 0.85rem;
  }

  .page-brand-logo {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
  }

  .page-brand-title {
    margin: 0;
    font-size: 1rem;
  }

  .site.sidebar-collapsed {
    grid-template-columns: 1fr;
  }

  .site.sidebar-collapsed .sidebar {
    display: none;
  }
}

@media (max-width: 620px) {
  .content {
    padding-inline: 0.8rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .button-link {
    width: 100%;
  }

  .stage-strip {
    grid-template-columns: repeat(2, minmax(90px, 1fr));
  }

  .hero,
  .card,
  .diagram-card,
  .action-card,
  .stat-card,
  .highlight-card,
  .stage-card,
  .code-card {
    border-radius: var(--radius-lg);
  }
}