:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --border: #334155;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
}

.brand {
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1rem;
  font-size: 0.95rem;
  transition: color 0.15s;
}

nav a:hover { color: var(--accent); }

main {
  flex: 1;
  padding: 3rem 0;
}

.hero h1 {
  font-size: 2.4rem;
  margin: 0 0 0.5rem;
}

.lead {
  color: var(--muted);
  max-width: 640px;
  line-height: 1.6;
}

.version-badge {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.25rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--accent);
}

.grid {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.2rem;
}

.card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

code {
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.9em;
}

.error-page {
  text-align: center;
  padding: 3rem 0;
}

.error-page h1 {
  font-size: 5rem;
  margin: 0;
  color: var(--accent);
}

.error-page p {
  color: var(--muted);
}

.btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.6rem 1.2rem;
  background: var(--accent);
  color: #0b1220;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
}

.btn:hover { filter: brightness(1.1); }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1rem 0;
  text-align: center;
  color: var(--muted);
}