:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface-2: #243044;
  --border: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --success: #34d399;
  --warn: #fbbf24;
  --radius: 10px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  font-size: 1rem;
}

.doc-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.doc-header h1 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
}

.doc-header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.doc-header a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.85rem;
}

.doc-header a:hover {
  text-decoration: underline;
}

.doc-wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

.doc-wrap h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.35rem;
}

.doc-wrap h3 {
  margin: 1.35rem 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent);
}

.doc-wrap p {
  margin: 0.65rem 0;
  color: var(--muted);
}

.doc-wrap p strong,
.doc-wrap li strong {
  color: var(--text);
}

.doc-wrap ul,
.doc-wrap ol {
  margin: 0.5rem 0;
  padding-left: 1.35rem;
  color: var(--muted);
}

.doc-wrap li {
  margin: 0.35rem 0;
}

.callout {
  margin: 1rem 0;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface-2);
  font-size: 0.92rem;
  color: var(--muted);
}

.callout.ok {
  border-color: rgba(52, 211, 153, 0.35);
}

.callout.warn {
  border-color: rgba(251, 191, 36, 0.4);
}

code,
pre {
  font-family: ui-monospace, "Cascadia Code", "Consolas", monospace;
  font-size: 0.88em;
}

pre {
  margin: 0.75rem 0;
  padding: 1rem;
  overflow-x: auto;
  border-radius: 8px;
  background: #0c1016;
  border: 1px solid var(--border);
  color: #cbd5e1;
  line-height: 1.45;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.88rem;
}

th,
td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.65rem;
  text-align: left;
}

th {
  background: var(--surface-2);
  color: var(--text);
}

td {
  color: var(--muted);
}

.btn-back {
  display: inline-block;
  margin-top: 2rem;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  background: var(--accent);
  color: #0f172a;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
}

.btn-back:hover {
  filter: brightness(1.05);
}