:root {
  --bg: #06080c;
  --surface: #0e131a;
  --border: #212a36;
  --text: #f2f5f9;
  --muted: #98a4b5;
  --faint: #667384;
  --accent: #00d395;
  --accent-dim: #00b37e;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f6f8;
    --surface: #ffffff;
    --border: #d8dee6;
    --text: #12161c;
    --muted: #4b5563;
    --faint: #6b7280;
    --accent: #00a074;
    --accent-dim: #008a63;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dim); text-decoration: underline; }
.wrap { max-width: 720px; margin: 0 auto; padding: 28px 20px 80px; }
header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
}
.brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
  letter-spacing: -0.02em;
}
.brand:hover { text-decoration: none; color: var(--accent); }
nav { display: flex; flex-wrap: wrap; gap: 14px; font-size: 14px; }
.spacer { flex: 1; }
.lang {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
}
h1 { font-size: 28px; letter-spacing: -0.03em; margin: 0 0 8px; }
.meta { color: var(--faint); font-size: 13px; margin: 0 0 28px; }
p { color: var(--muted); margin: 0 0 16px; }
.cards { display: grid; gap: 12px; margin: 28px 0; }
.card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 18px;
  color: inherit;
}
.card:hover { text-decoration: none; border-color: var(--accent-dim); }
.card strong { display: block; color: var(--text); margin-bottom: 4px; }
.card span { color: var(--muted); font-size: 14px; }
footer { margin-top: 48px; color: var(--faint); font-size: 13px; }
[hidden] { display: none !important; }