:root {
  --bg: #FBF6EC;
  --bg-2: #EADBC0;
  --card: #FFFDF8;
  --text: #3A2E25;
  --muted: #6E5D4E;
  --accent: #9E2A2B;
  --border: #E2D3B8;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1A1613;
    --bg-2: #120F0D;
    --card: #2A2420;
    --text: #EDE3D3;
    --muted: #BBA98F;
    --accent: #F2C46D;
    --border: #3D342D;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: linear-gradient(var(--bg), var(--bg-2)) fixed;
  color: var(--text);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 16px 64px;
}

header.hero {
  text-align: center;
  margin-bottom: 32px;
}

header.hero img {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, .15);
}

h1 { color: var(--accent); font-size: 2rem; margin: 12px 0 4px; }
h2 { color: var(--accent); font-size: 1.25rem; margin: 0 0 12px; }
h3 { font-size: 1.05rem; margin: 20px 0 4px; }
p, li { margin: 0 0 10px; }
.subtitle, .muted { color: var(--muted); }

nav {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 12px;
  font-size: .95rem;
}

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

section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 22px;
  margin-bottom: 18px;
}

details { border-top: 1px solid var(--border); padding: 10px 0; }
details:first-of-type { border-top: none; }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 8px 0 0; }

footer {
  text-align: center;
  color: var(--muted);
  font-size: .85rem;
  margin-top: 32px;
}

.lang-divider {
  text-align: center;
  color: var(--muted);
  margin: 40px 0 24px;
  font-size: .9rem;
  letter-spacing: .1em;
}