@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Source+Serif+4:wght@500;700&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
  --bg: #f4f8ff;
  --bg-accent: #e8f2ff;
  --panel: #ffffff;
  --ink: #10213a;
  --muted: #4f6482;
  --line: #d6e0f0;
  --nav-bg: #0d1f3c;
  --nav-ink: #dce8ff;
  --nav-muted: #8fa6cc;
  --primary: #1260df;
  --primary-soft: #dbe9ff;
  --success: #0f9f88;
  --warn: #d58b11;
  --code-bg: #0f172a;
  --code-ink: #d9e5ff;
  --shadow: 0 14px 36px rgba(19, 38, 73, 0.08);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Space Grotesk', 'Avenir Next', sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 8%, var(--bg-accent) 0, transparent 34%),
    radial-gradient(circle at 88% 14%, #eaf7f5 0, transparent 30%),
    var(--bg);
  line-height: 1.55;
}

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

a:hover {
  text-decoration: underline;
}

.layout {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 290px 1fr;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 22px 16px;
  background: linear-gradient(170deg, #0f2548 0%, #10213a 55%, #0a1a30 100%);
  color: var(--nav-ink);
}

.brand {
  display: block;
  margin-bottom: 22px;
  padding: 10px 12px;
  border: 1px solid rgba(164, 192, 237, 0.28);
  border-radius: var(--radius-md);
  background: rgba(153, 186, 236, 0.08);
}

.brand h1 {
  margin: 0;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
}

.brand p {
  margin: 6px 0 0;
  color: var(--nav-muted);
  font-size: 0.82rem;
}

.nav-group {
  margin-bottom: 18px;
}

.nav-group-title {
  margin: 0 0 8px;
  padding: 0 8px;
  color: var(--nav-muted);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-link {
  display: block;
  margin: 3px 0;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  color: var(--nav-ink);
  font-size: 0.93rem;
}

.nav-link:hover {
  background: rgba(176, 201, 243, 0.11);
  text-decoration: none;
}

.nav-link.active {
  background: rgba(117, 157, 224, 0.2);
  border: 1px solid rgba(167, 195, 242, 0.32);
}

.sidebar-footer {
  margin-top: 18px;
  padding: 12px;
  border: 1px solid rgba(164, 192, 237, 0.25);
  border-radius: var(--radius-md);
  color: var(--nav-muted);
  font-size: 0.8rem;
}

.content-wrap {
  min-width: 0;
  padding: 24px 34px 44px;
  animation: contentEnter 260ms ease-out;
}

@keyframes contentEnter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

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

.mobile-topbar {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  margin-bottom: 14px;
  border-radius: var(--radius-md);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.mobile-topbar button {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fbff;
  padding: 7px 10px;
  font: inherit;
}

.page-kicker {
  margin: 0;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.74rem;
  font-weight: 700;
}

h1,
h2,
h3 {
  color: var(--ink);
  line-height: 1.23;
}

h1 {
  margin: 10px 0 12px;
  font-size: clamp(1.8rem, 3vw, 2.65rem);
}

h2 {
  margin: 28px 0 12px;
  font-size: 1.38rem;
}

h3 {
  margin: 24px 0 10px;
  font-size: 1.05rem;
}

.page-subtitle {
  margin: 0;
  max-width: 72ch;
  color: var(--muted);
}

.hero-card,
.panel,
.note,
.stat-grid .stat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.hero-card {
  margin-top: 18px;
  padding: 20px;
}

.hero-list {
  margin: 10px 0 0;
  padding-left: 18px;
}

.grid {
  margin-top: 18px;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}

.panel {
  padding: 16px;
}

.panel h3 {
  margin-top: 0;
}

.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid #bbd3ff;
  color: #154394;
  background: var(--primary-soft);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.lang-picker {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.lang-btn {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #f8fbff;
  color: #1a3769;
  padding: 7px 12px;
  font: inherit;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
}

.lang-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: #1e4cb1;
}

.note {
  margin-top: 14px;
  padding: 14px 16px;
}

.note strong {
  color: #163d82;
}

.note.warning {
  border-color: #f2d49a;
  background: #fff9ec;
}

code,
pre {
  font-family: 'JetBrains Mono', Menlo, Consolas, monospace;
}

pre {
  margin: 12px 0;
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: 12px;
  border: 1px solid #22324d;
  padding: 14px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
}

.inline-code {
  font-family: 'JetBrains Mono', Menlo, Consolas, monospace;
  font-size: 0.84rem;
  background: #ecf3ff;
  color: #133e84;
  border: 1px solid #c8daf8;
  border-radius: 6px;
  padding: 2px 6px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

th,
td {
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  padding: 10px 11px;
  font-size: 0.92rem;
}

th {
  background: #f4f8ff;
  font-weight: 700;
}

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

.list-tight {
  margin: 8px 0;
  padding-left: 18px;
}

.stat-grid {
  margin-top: 16px;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.stat-grid .stat {
  padding: 14px;
}

.stat .value {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
  color: #153f87;
}

.stat .label {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.footer {
  margin-top: 30px;
  color: var(--muted);
  font-size: 0.86rem;
}

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

  .sidebar {
    position: fixed;
    z-index: 20;
    left: 0;
    top: 0;
    bottom: 0;
    width: min(82vw, 320px);
    transform: translateX(-102%);
    transition: transform 220ms ease;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .content-wrap {
    padding: 14px 14px 28px;
  }

  .mobile-topbar {
    display: flex;
  }

  .page-subtitle {
    max-width: 100%;
  }
}