:root {
  --ink: #171f33;
  --accent: #ff6b36;
  --bg: #f7f7f8;
  --card: #ffffff;
  --text: #24293a;
  --muted: #6b7186;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1220;
    --card: #1a1e30;
    --text: #e8eaf2;
    --muted: #9aa0b5;
  }
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.9;
}
header {
  background: linear-gradient(135deg, #1c2440, #0c101f);
  color: #fff;
  padding: 56px 24px 48px;
  text-align: center;
}
header .logo {
  width: 72px; height: 72px;
  border-radius: 18px;
  margin: 0 auto 16px;
  display: block;
}
header h1 { font-size: 1.6rem; font-weight: 700; }
header p { color: rgba(255,255,255,.65); font-size: .95rem; margin-top: 6px; }
main {
  max-width: 720px;
  margin: -24px auto 64px;
  padding: 0 20px;
}
.card {
  background: var(--card);
  border-radius: 20px;
  padding: 36px 32px;
  box-shadow: 0 10px 40px rgba(0,0,0,.08);
}
h2 {
  font-size: 1.15rem;
  margin: 32px 0 12px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
}
h2:first-child { margin-top: 0; }
p, li { color: var(--text); font-size: .95rem; }
ul { padding-left: 22px; margin: 8px 0; }
.updated { color: var(--muted); font-size: .85rem; margin-bottom: 24px; }
.note {
  background: rgba(255,107,54,.08);
  border-radius: 12px;
  padding: 14px 18px;
  margin: 16px 0;
  font-size: .9rem;
}
footer {
  text-align: center;
  padding: 32px;
  color: var(--muted);
  font-size: .85rem;
}
footer a { color: var(--accent); text-decoration: none; margin: 0 8px; }