/* 推廣頁共用樣式（Apple 風格，支援深色模式） */
:root {
  --bg: #f5f5f7; --card: #ffffff; --text: #1d1d1f; --text2: #6e6e73; --line: rgba(0,0,0,0.08);
  --blue: #0071e3; --blue2: #0a84ff; --orange: #ff9f0a; --radius: 20px;
  --sf: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang TC", "Helvetica Neue", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #000; --card: #1c1c1e; --text: #f5f5f7; --text2: #a1a1a6; --line: rgba(255,255,255,0.12); --blue: #2997ff; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--sf); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
.nav { position: sticky; top: 0; z-index: 10; backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px);
  background: color-mix(in srgb, var(--bg) 78%, transparent); border-bottom: 0.5px solid var(--line); }
.nav .in { max-width: 980px; margin: 0 auto; padding: 0 16px; height: 48px; display: flex; align-items: center; gap: 18px; font-size: 14px; overflow-x: auto; white-space: nowrap; }
.nav .brand { font-weight: 700; color: var(--text); margin-right: auto; }
.nav a { color: var(--text2); }
.nav a[aria-current] { color: var(--text); font-weight: 600; }
.hero { text-align: center; padding: 56px 16px 32px; }
.hero .eyebrow { color: var(--orange); font-weight: 600; font-size: 15px; }
.hero h1 { font-size: clamp(34px, 7vw, 56px); line-height: 1.08; letter-spacing: -0.02em; margin: 8px 0 12px; }
.hero p { font-size: clamp(17px, 2.6vw, 21px); color: var(--text2); max-width: 680px; margin: 0 auto; }
.cta { display: inline-block; margin-top: 22px; background: var(--blue2); color: #fff !important; font-weight: 600; font-size: 17px; padding: 13px 28px; border-radius: 999px; text-decoration: none !important; }
.cta.alt { background: transparent; color: var(--blue) !important; }
main { max-width: 820px; margin: 0 auto; padding: 0 16px 56px; }
section.card { background: var(--card); border-radius: var(--radius); padding: 26px 24px; margin: 16px 0; box-shadow: 0 1px 2px rgba(0,0,0,0.04); }
h2 { font-size: 26px; letter-spacing: -0.01em; margin: 0 0 10px; line-height: 1.25; }
h3 { font-size: 19px; margin: 20px 0 6px; }
p, li { font-size: 16px; }
.muted { color: var(--text2); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin-top: 12px; }
.tile { background: var(--bg); border-radius: 16px; padding: 16px; }
.tile b { display: block; font-size: 17px; margin-bottom: 4px; }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; padding: 9px 6px; border-bottom: 0.5px solid var(--line); vertical-align: top; }
th { color: var(--text2); font-weight: 600; white-space: nowrap; }
details { border-bottom: 0.5px solid var(--line); padding: 12px 0; }
details summary { cursor: pointer; font-weight: 600; font-size: 17px; }
kbd { font: 600 13px var(--sf); background: var(--bg); border: 0.5px solid var(--line); border-radius: 6px; padding: 1px 6px; }
footer { text-align: center; color: var(--text2); font-size: 13px; padding: 28px 16px 40px; border-top: 0.5px solid var(--line); }
footer p { font-size: 13px; margin: 6px 0; }