:root {
  --bg: #0f1720;
  --panel: #151f2b;
  --panel-soft: #1b2836;
  --text: #edf4ff;
  --muted: #9fb1c6;
  --line: #2a3a4d;
  --accent: #3dd6a5;
  --accent-2: #55b7ff;
  --code: #0a1018;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a {
  color: var(--accent-2);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.layout {
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  border-right: 1px solid var(--line);
  background: rgba(21, 31, 43, 0.96);
  padding: 24px 18px;
  overflow-y: auto;
}

.brand {
  margin-bottom: 24px;
}

.brand-title {
  display: block;
  color: var(--text);
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-subtitle {
  color: var(--muted);
  font-size: 13px;
}

.nav {
  display: grid;
  gap: 4px;
}

.nav a {
  color: var(--muted);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 14px;
}

.nav a:hover {
  background: var(--panel-soft);
  color: var(--text);
  text-decoration: none;
}

.nav a.active {
  background: linear-gradient(90deg, rgba(61, 214, 165, 0.18), rgba(85, 183, 255, 0.14));
  color: var(--text);
  border: 1px solid rgba(61, 214, 165, 0.25);
}

.content {
  min-width: 0;
}

.hero {
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 20% 0%, rgba(61, 214, 165, 0.18), transparent 32%),
    radial-gradient(circle at 85% 10%, rgba(85, 183, 255, 0.15), transparent 28%),
    var(--panel);
  padding: 48px clamp(24px, 6vw, 72px);
}

.hero h1 {
  max-width: 900px;
  margin: 0 0 12px;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero p {
  max-width: 780px;
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.article {
  max-width: 980px;
  padding: 36px clamp(24px, 6vw, 72px) 72px;
}

.article h1,
.article h2,
.article h3 {
  line-height: 1.25;
  letter-spacing: 0;
}

.article h1 {
  font-size: 36px;
  margin: 0 0 18px;
}

.article h2 {
  margin-top: 36px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.article p,
.article li {
  color: #d7e2ef;
}

.article table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  overflow: hidden;
  border-radius: 8px;
}

.article th,
.article td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.article th {
  background: var(--panel-soft);
  color: var(--text);
}

.article td {
  background: rgba(21, 31, 43, 0.55);
}

code {
  background: var(--code);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: #b8f7d7;
  padding: 2px 5px;
}

pre {
  background: var(--code);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow-x: auto;
  padding: 16px;
}

pre code {
  background: transparent;
  border: 0;
  padding: 0;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin: 24px 0;
}

.card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}

.card strong {
  display: block;
  color: var(--text);
  margin-bottom: 4px;
}

.card span {
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 840px) {
  .layout {
    display: block;
  }

  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .nav {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
}