:root {
  --bg: #07141f;
  --bg-2: #0f1f2d;
  --panel: rgba(14, 28, 39, 0.84);
  --panel-strong: #0d1d2a;
  --panel-soft: rgba(15, 31, 45, 0.9);
  --line: rgba(148, 163, 184, 0.18);
  --text: #e5eef7;
  --muted: #a5b7c7;
  --blue: #5cc8ff;
  --cyan: #7dd3fc;
  --green: #7ae7b7;
  --gold: #f5c76d;
  --orange: #f8a55a;
  --purple: #c7b7ff;
  --danger: #ff8a8a;
  --shadow: 0 18px 45px rgba(2, 6, 23, 0.45);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(92, 200, 255, 0.14), transparent 26%),
    radial-gradient(circle at bottom right, rgba(122, 231, 183, 0.12), transparent 24%),
    linear-gradient(180deg, var(--bg) 0%, #091821 100%);
  color: var(--text);
  font-family: Inter, "Segoe UI", sans-serif;
  line-height: 1.7;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(6, 19, 29, 0.72);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  font-size: 1.05rem;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--blue), var(--green));
  color: #02151d;
  font-weight: 900;
}

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

.nav a {
  padding: 9px 12px;
  border-radius: 999px;
  color: var(--muted);
  border: 1px solid transparent;
  transition: 0.2s ease;
}

.nav a.active,
.nav a:hover {
  background: rgba(92, 200, 255, 0.08);
  color: var(--text);
  border-color: rgba(92, 200, 255, 0.21);
  text-decoration: none;
}

.hero {
  padding: 48px 0 24px;
}

.hero-card {
  background: linear-gradient(180deg, var(--panel-soft) 0%, rgba(10, 23, 34, 0.95) 100%);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-header {
  padding: 32px 32px 24px;
  border-bottom: 1px solid var(--line);
}

.kicker {
  display: inline-block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--cyan);
  margin-bottom: 8px;
  font-weight: 700;
}

h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  line-height: 1.25;
  margin: 0 0 16px;
  color: #ffffff;
}

.hero-header p {
  margin: 0;
  max-width: 720px;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-body {
  padding: 32px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.col-6 { grid-column: span 6; }
.col-12 { grid-column: span 12; }

@media (max-width: 768px) {
  .col-6 { grid-column: span 12; }
  .topbar-inner { flex-direction: column; padding: 16px 0; }
  .hero-header, .hero-body { padding: 20px; }
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 24px;
}

.card h2, .card h3 {
  margin: 0 0 14px;
  color: #fff;
  font-size: 1.2rem;
}

.checks {
  list-style: none;
  padding: 0;
  margin: 0;
}

.checks li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 12px;
  color: var(--muted);
}

.checks li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--green);
  font-weight: bold;
}

pre {
  background: #040d14;
  border: 1px solid var(--line);
  padding: 16px;
  border-radius: 10px;
  overflow-x: auto;
  color: #7dd3fc;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.85rem;
  line-height: 1.6;
}

code {
  font-family: "JetBrains Mono", monospace;
  color: var(--cyan);
  background: rgba(125, 211, 252, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

.footer {
  text-align: center;
  padding: 40px 0;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--line);
  margin-top: 48px;
}

.badge {
  display: inline-block;
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(92, 200, 255, 0.12);
  color: var(--blue);
  border: 1px solid rgba(92, 200, 255, 0.25);
  font-weight: 600;
  text-transform: uppercase;
}

.doc-nav-buttons {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
}

.doc-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: rgba(92, 200, 255, 0.1);
  color: var(--cyan);
  border: 1px solid rgba(92, 200, 255, 0.25);
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: 0.2s ease;
  text-decoration: none;
}

.doc-btn:hover {
  background: var(--blue);
  color: #02151d;
  text-decoration: none;
  border-color: var(--blue);
  transform: translateY(-1px);
}

.doc-btn-secondary {
  background: rgba(148, 163, 184, 0.08);
  color: var(--muted);
  border-color: var(--line);
}

.doc-btn-secondary:hover {
  background: rgba(148, 163, 184, 0.18);
  color: var(--text);
  border-color: rgba(148, 163, 184, 0.35);
  text-decoration: none;
}