:root {
  color-scheme: light dark;
  --bg: #000000;
  --panel: rgba(15, 23, 42, 0.55);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --link: #34d399;
  --border: rgba(148, 163, 184, 0.18);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f8fafc;
    --panel: rgba(255, 255, 255, 0.85);
    --text: #0f172a;
    --muted: #475569;
    --link: #047857;
    --border: rgba(15, 23, 42, 0.12);
  }
}

html, body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

body {
  background-image:
    radial-gradient(1200px 600px at 50% -10%, rgba(16, 185, 129, 0.18), transparent 60%),
    radial-gradient(900px 420px at 10% 10%, rgba(56, 189, 248, 0.08), transparent 55%),
    radial-gradient(900px 420px at 90% 20%, rgba(168, 85, 247, 0.07), transparent 55%);
  background-attachment: fixed;
}

a { color: var(--link); }

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 32px 18px 56px;
}

.header {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  text-decoration: none;
}

.brand img {
  width: 34px;
  height: 34px;
}

.brand strong {
  font-size: 18px;
  letter-spacing: -0.02em;
  color: var(--text);
}

.nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.nav a {
  text-decoration: none;
  padding: 8px 10px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
}

.nav a:hover {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.38);
  color: #a7f3d0;
}

.card {
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  padding: 18px;
  margin: 14px 0;
}

h1 {
  font-size: 32px;
  margin: 14px 0 8px;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 20px;
  margin: 22px 0 10px;
}

p, li {
  line-height: 1.6;
}

.muted {
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

@media (max-width: 860px) {
  .feature-grid { grid-template-columns: 1fr; }
}

.feature {
  border: 1px solid rgba(148, 163, 184, 0.14);
  border-radius: 16px;
  background: rgba(2, 6, 23, 0.35);
  padding: 14px;
}

.feature-head {
  display: flex;
  gap: 10px;
  align-items: center;
}

.feature h2 {
  margin: 0;
  font-size: 18px;
}

.feature-icon {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: #34d399;
}

.feature-icon svg {
  width: 18px;
  height: 18px;
}

.callout {
  margin-top: 18px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(16, 185, 129, 0.22);
  background: rgba(16, 185, 129, 0.08);
}

.kv {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 10px 16px;
}

@media (max-width: 640px) {
  .kv { grid-template-columns: 1fr; }
}

.footer {
  margin-top: 26px;
  border-top: 1px solid var(--border);
  padding-top: 14px;
  font-size: 14px;
  color: var(--muted);
}