:root {
  --bg: #fdf8f1;
  --card: #ffffff;
  --text: #3a2e25;
  --muted: #7a6a5c;
  --accent: #e8822f;
  --accent-soft: #fbe7d3;
  --line: #eadfd2;
  --radius: 16px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1f1a16;
    --card: #2a231e;
    --text: #f3ebe2;
    --muted: #b6a796;
    --accent: #f39a4c;
    --accent-soft: #3b2c20;
    --line: #3d332b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC",
    "Microsoft JhengHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

header.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand svg { flex: none; }

.brand strong { font-size: 1.25rem; }

.lang-toggle {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  border-radius: 999px;
  padding: 6px 14px;
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
}

h1 { font-size: 1.8rem; line-height: 1.3; margin: 0 0 8px; }
h2 { font-size: 1.25rem; margin: 32px 0 12px; }
h3 { font-size: 1.05rem; margin: 20px 0 6px; }

p, li { color: var(--text); }
.muted { color: var(--muted); font-size: 0.92rem; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin: 16px 0;
}

.card > :first-child { margin-top: 0; }
.card > :last-child { margin-bottom: 0; }

.highlight {
  background: var(--accent-soft);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 16px 0;
}

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

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 600;
}

details {
  border-top: 1px solid var(--line);
  padding: 12px 0;
}
details:last-of-type { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; }
details p, details ul { margin: 8px 0 0; }

ul { padding-left: 1.3em; }

footer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
}
footer a { color: var(--muted); }

.app-list { list-style: none; padding: 0; }
.app-list li {
  display: flex;
  gap: 16px;
  align-items: center;
}

/* 語言切換：預設顯示中文，html[lang=en] 時顯示英文 */
[data-lang="en"] { display: none; }
html[lang="en"] [data-lang="zh"] { display: none; }
html[lang="en"] [data-lang="en"] { display: revert; }
html[lang="en"] span[data-lang="en"] { display: inline; }