:root {
  --bg: #eef3f9;
  --surface: #ffffff;
  --surface-soft: #f7faff;
  --surface-strong: #e8f0ff;
  --text: #102a43;
  --muted: #52606d;
  --line: #d9e2ec;
  --line-strong: #bcccdc;
  --accent: #175cd3;
  --accent-soft: #dbe8ff;
  --success-soft: #e7f8eb;
  --warn-soft: #fff3d7;
  --shadow: 0 20px 48px rgba(16, 42, 67, 0.08);
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 14px;
  --sidebar-width: 320px;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(23, 92, 211, 0.12), transparent 24%),
    linear-gradient(180deg, #f9fbff 0%, var(--bg) 100%);
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code,
pre {
  font-family: var(--mono);
}

code {
  font-size: 0.95em;
}

.doc-content p code,
.doc-content li code,
.doc-content figcaption code {
  display: inline-block;
  padding: 0.16em 0.5em;
  border: 1px solid rgba(23, 92, 211, 0.18);
  border-radius: 999px;
  background: linear-gradient(180deg, #eef4ff 0%, #dbe8ff 100%);
  color: #0b3ea8;
  font-weight: 600;
}

pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  border-radius: 14px;
  background: #0f172a;
  color: #e2e8f0;
  font-size: 14px;
  line-height: 1.6;
}

p,
li {
  line-height: 1.65;
}

ul,
ol {
  margin: 0;
  padding-left: 22px;
}

img {
  max-width: 100%;
}

.doc-layout {
  width: min(1440px, calc(100vw - 32px));
  margin: 20px auto 40px;
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.doc-sidebar {
  position: sticky;
  top: 16px;
  max-height: calc(100vh - 32px);
  overflow: auto;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
}

.brand {
  margin-bottom: 18px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #ffffff 0%, var(--surface-strong) 100%);
}

.brand-title {
  margin: 0 0 6px;
  font-size: 20px;
  font-weight: 700;
}

.brand-subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

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

.nav-level .nav-level {
  margin-top: 6px;
  margin-left: 14px;
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.nav-item {
  margin: 2px 0;
}

.nav-link {
  display: block;
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--text);
  font-size: 14px;
  line-height: 1.4;
}

.nav-link:hover {
  background: var(--surface-soft);
  text-decoration: none;
}

.nav-item.current > .nav-link {
  background: var(--accent-soft);
  color: #0b3ea8;
  font-weight: 700;
}

.nav-item.ancestor > .nav-link {
  background: var(--surface-soft);
  font-weight: 600;
}

.doc-content {
  min-width: 0;
}

.page-header,
.content-card,
.diagram-card,
.link-grid a,
.note,
.warning,
.spec-card,
.inline-card {
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.page-header {
  margin-bottom: 24px;
  padding: 28px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, #ffffff 0%, #eef4ff 100%);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-header h1 {
  margin: 0 0 12px;
  font-size: clamp(30px, 4vw, 42px);
  line-height: 1.1;
}

.page-header p:last-child {
  margin-bottom: 0;
}

.breadcrumbs {
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 13px;
}

.breadcrumbs a {
  color: var(--muted);
}

.content-card,
.spec-card,
.inline-card,
.diagram-card {
  margin-bottom: 20px;
  padding: 22px;
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.content-card h2,
.spec-card h2,
.inline-card h2,
.diagram-card h2 {
  margin: 0 0 16px;
  font-size: 24px;
}

.content-card h3,
.spec-card h3,
.inline-card h3,
.diagram-card h3 {
  margin: 0 0 12px;
  font-size: 19px;
}

.content-card > *:last-child,
.spec-card > *:last-child,
.inline-card > *:last-child,
.diagram-card > *:last-child {
  margin-bottom: 0;
}

.card-grid,
.link-grid,
.two-col {
  display: grid;
  gap: 18px;
}

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

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

.link-grid a {
  display: block;
  padding: 18px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
}

.link-grid a strong {
  display: block;
  margin-bottom: 8px;
  font-size: 18px;
  color: var(--text);
}

.link-grid a span {
  display: block;
  color: var(--muted);
}

.note,
.warning {
  margin: 16px 0 0;
  padding: 16px 18px;
  border-radius: var(--radius-md);
}

.note {
  background: var(--surface-soft);
}

.warning {
  background: var(--warn-soft);
}

.diagram-image {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
}

.diagram-caption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
}

.spec-grid {
  display: grid;
  gap: 18px;
}

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

.spec-item {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-soft);
}

.spec-item strong {
  display: inline-block;
  min-width: 150px;
  margin-right: 6px;
}

.table-wrap {
  overflow-x: auto;
}

.doc-table {
  width: 100%;
  border-collapse: collapse;
}

.doc-table th,
.doc-table td {
  padding: 12px 14px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.doc-table th {
  background: var(--surface-soft);
}

.screen-grid {
  display: grid;
  gap: 18px;
}

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

.screen-card {
  margin-bottom: 20px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.screen-card a {
  display: block;
}

.screen-card a:hover {
  text-decoration: none;
}

.screen-shot {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f8fbff;
}

.screen-caption {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 1080px) {
  .doc-layout {
    grid-template-columns: 1fr;
  }

  .doc-sidebar {
    position: static;
    max-height: none;
  }
}

@media (max-width: 760px) {
  .doc-layout {
    width: min(100vw - 20px, 1440px);
    margin: 14px auto 28px;
  }

  .page-header,
  .content-card,
  .diagram-card,
  .spec-card,
  .inline-card,
  .doc-sidebar {
    padding: 18px;
  }

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

  .spec-item strong {
    display: block;
    min-width: 0;
    margin-right: 0;
    margin-bottom: 4px;
  }
}