:root {
  --bg: #0c1117;
  --surface: #151b24;
  --border: #243044;
  --text: #e8eef6;
  --muted: #8fa3bc;
  --accent: #3dd6c6;
  --accent-dim: #2a9d8f;
  --warn: #f4a261;
  --max: 1080px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "Source Code Pro", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 17px;
}

a { color: var(--accent); }
a:hover { color: #6ee7d9; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(12, 17, 23, 0.85);
  border-bottom: 1px solid var(--border);
}
.site-header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.brand span { color: var(--accent); }
.nav-links { display: flex; gap: 18px; flex-wrap: wrap; font-size: 0.92rem; }
.nav-links a { color: var(--muted); text-decoration: none; }
.nav-links a:hover { color: var(--text); }

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 56px 20px 40px;
  display: grid;
  gap: 28px;
}
@media (min-width: 860px) {
  .hero { grid-template-columns: 1.2fr 0.8fr; align-items: center; padding-top: 72px; }
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.12;
  margin: 0 0 16px;
  letter-spacing: -0.03em;
}
.lead { color: var(--muted); font-size: 1.12rem; max-width: 52ch; margin: 0 0 24px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 18px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent-dim); color: #04120f; }
.btn-primary:hover { background: var(--accent); }
.btn-secondary {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-secondary:hover { border-color: var(--accent); }

.hero-card {
  background: linear-gradient(145deg, #1a2332, #121820);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}
.hero-card h2 { margin: 0 0 12px; font-size: 1rem; color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; }
.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.stat {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 10px;
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, 0.04);
}
.stat strong { display: block; font-size: 0.78rem; color: var(--muted); font-weight: 500; }
.stat code { font-family: var(--mono); font-size: 0.82rem; word-break: break-all; }

main section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 36px 20px;
}
section h2 {
  margin: 0 0 8px;
  font-size: 1.55rem;
  letter-spacing: -0.02em;
}
.section-lead { color: var(--muted); margin: 0 0 22px; max-width: 65ch; }

.feature-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 18px 16px;
}
.feature h3 { margin: 0 0 8px; font-size: 1.05rem; }
.feature p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.api-table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 12px; }
table.api-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.api-table th, .api-table td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
.api-table th { background: #1a2230; color: var(--muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; }
.api-table tr:last-child td { border-bottom: none; }
.api-table code { font-family: var(--mono); font-size: 0.85rem; color: #b8e8df; }

.privacy-list { margin: 0; padding-left: 1.2rem; color: var(--muted); }
.privacy-list li { margin-bottom: 8px; }

.arch-diagram {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.45;
  color: #b6c8dc;
  overflow-x: auto;
  white-space: pre;
}

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 24px;
  padding: 28px 20px 40px;
  color: var(--muted);
  font-size: 0.88rem;
}
.site-footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: space-between;
}