:root {
  color-scheme: dark;
  font-family: 'Segoe UI', Tahoma, sans-serif;
  --bg-1: #0f1217;
  --bg-2: #161c26;
  --bg-3: #1d2734;
  --text: #eef3fb;
  --muted: #aab8cf;
  --line: #2b3546;
  --link: #7db6ff;
  --link-hover: #a8cdff;
  --chip: #22344b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, #1a2432 0%, var(--bg-1) 55%);
  color: var(--text);
}

.layout {
  max-width: 1280px;
  margin: 0 auto;
  padding: 28px;
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  gap: 24px;
}

.sidebar {
  position: sticky;
  top: 18px;
  align-self: start;
  background: linear-gradient(180deg, var(--bg-2), #131922);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
}

.brand {
  margin: 0;
  font-size: 1.2rem;
}

.tagline {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.9rem;
}

.nav-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-list a {
  display: block;
  padding: 8px 10px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--muted);
  border: 1px solid transparent;
}

.nav-list a:hover {
  color: var(--text);
  border-color: var(--line);
  background: rgba(125, 182, 255, 0.08);
}

.nav-list a.active {
  color: var(--text);
  background: rgba(125, 182, 255, 0.16);
  border-color: rgba(125, 182, 255, 0.35);
}

.content {
  min-width: 0;
}

.doc {
  background: linear-gradient(180deg, var(--bg-2), #121822);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 26px;
}

h1,
h2,
h3 {
  line-height: 1.3;
}

h1 {
  margin-top: 0;
  font-size: 2rem;
}

h2,
h3 {
  margin-top: 1.7rem;
}

p,
li {
  color: var(--muted);
  line-height: 1.65;
}

a {
  color: var(--link);
}

a:hover {
  color: var(--link-hover);
}

pre {
  overflow-x: auto;
  background: #0c1118;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
}

code {
  font-family: Consolas, 'Courier New', monospace;
  font-size: 0.92em;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}

th,
td {
  border: 1px solid var(--line);
  text-align: left;
  padding: 10px;
}

th {
  background: #111a25;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(180deg, #172233, #111824);
  padding: 14px;
}

.card h3 {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 1rem;
}

.card p {
  margin: 0;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  border: 1px solid rgba(125, 182, 255, 0.35);
  background: var(--chip);
  color: #dbe9ff;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.84rem;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  .sidebar {
    position: static;
  }
}