* {
  box-sizing: border-box;
}

:root {
  --bg: #0b1220;
  --panel: #121b2e;
  --panel-2: #18243d;
  --text: #e8eefc;
  --muted: #9fb0d0;
  --accent: #4da3ff;
  --accent-2: #6fd3ff;
  --line: rgba(255, 255, 255, 0.1);
  --ok: #8be9a8;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(77, 163, 255, 0.18), transparent 28%),
    radial-gradient(circle at top right, rgba(111, 211, 255, 0.12), transparent 24%),
    linear-gradient(180deg, #0a1120 0%, #0d1628 100%);
  color: var(--text);
  line-height: 1.6;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  padding: 56px 0 32px;
}

.hero-card {
  background: linear-gradient(180deg, rgba(24, 36, 61, 0.95), rgba(18, 27, 46, 0.95));
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 36px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(77, 163, 255, 0.12);
  border: 1px solid rgba(77, 163, 255, 0.28);
  color: var(--accent-2);
  font-size: 14px;
}

h1,
h2,
h3 {
  margin: 0 0 16px;
  line-height: 1.2;
}

h1 {
  font-size: clamp(34px, 5vw, 56px);
  margin-top: 18px;
}

.lead {
  max-width: 760px;
  color: var(--muted);
  font-size: 18px;
  margin-bottom: 28px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 14px;
  font-weight: 600;
  border: 1px solid var(--line);
  transition: 0.18s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #09111d;
  border: none;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
}

.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin: 28px 0 40px;
}

.card {
  background: rgba(18, 27, 46, 0.92);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 22px;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.docs {
  padding: 8px 0 56px;
}

.doc-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.doc-link {
  display: block;
  background: linear-gradient(180deg, rgba(24, 36, 61, 0.95), rgba(18, 27, 46, 0.95));
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
}

.doc-link strong {
  display: block;
  margin-bottom: 6px;
  color: var(--text);
}

.doc-link span {
  color: var(--muted);
}

.footer {
  padding: 0 0 48px;
  color: var(--muted);
}

.doc-shell {
  padding: 28px 0 56px;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.doc-card {
  background: rgba(18, 27, 46, 0.96);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 28px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.28);
}

.doc-meta {
  color: var(--muted);
  margin-bottom: 24px;
}

.doc-content h1,
.doc-content h2,
.doc-content h3 {
  margin-top: 28px;
}

.doc-content p {
  margin: 0 0 14px;
}

.doc-content ul {
  margin: 0 0 18px 20px;
}

.doc-content li {
  margin-bottom: 8px;
}

.back-link {
  color: var(--accent-2);
  font-weight: 600;
}

@media (max-width: 640px) {
  .hero {
    padding-top: 28px;
  }

  .hero-card,
  .doc-card {
    padding: 22px;
    border-radius: 22px;
  }

  .lead {
    font-size: 16px;
  }
}