/* Content pages under /guides: plain HTML + CSS, no JavaScript. Dark mode follows the device. */
:root {
  --bg: #F5F8FC;
  --glow-1: #DCE8FF;
  --glow-2: #DDF2FD;
  --card: #FFFFFF;
  --line: #E2E8F0;
  --soft: #EEF3F9;
  --ink: #1E293B;
  --ink-2: #334155;
  --sub: #52627A;
  --muted: #64748B;
  --ac: #2563EB;
  --ac-2: #0EA5E9;
  --ac-soft: #E8F0FF;
  --ac-ink: #1D4ED8;
  --ok: #047857;
  --font: 'Inter', 'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0F1E35;
    --glow-1: #17386A;
    --glow-2: #113C5C;
    --card: #172B47;
    --line: #28426A;
    --soft: #1D355A;
    --ink: #E8EEF7;
    --ink-2: #C9D5E6;
    --sub: #A7B6CC;
    --muted: #8DA0BA;
    --ac: #5B9BFF;
    --ac-soft: rgba(91, 155, 255, .16);
    --ac-ink: #93BBFF;
    --ok: #34D399;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; color: var(--ink); font: 16px/1.85 var(--font); -webkit-font-smoothing: antialiased;
  background: radial-gradient(1100px 480px at 8% -12%, var(--glow-1), transparent 60%), radial-gradient(900px 480px at 100% -8%, var(--glow-2), transparent 55%), var(--bg);
  background-attachment: fixed;
}
a { color: var(--ac-ink); }
img { max-width: 100%; }

.g-top { max-width: 1080px; margin: 0 auto; padding: 16px 24px; display: flex; align-items: center; gap: 16px; }
.g-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-weight: 700; font-size: 18px; letter-spacing: .3px; }
.g-brand em { font-style: normal; color: var(--ac); }
.g-mark { width: 34px; height: 34px; border-radius: 10px; background: linear-gradient(135deg, #2563EB, #0EA5E9); display: grid; place-items: center; color: #fff; }
.g-nav { margin-left: auto; display: flex; gap: 6px; align-items: center; }
.g-nav a { text-decoration: none; color: var(--sub); font-weight: 600; font-size: 15px; padding: 8px 12px; border-radius: 10px; }
.g-nav a:hover { color: var(--ink); background: var(--soft); }
.g-nav a.g-cta { color: #fff; background: linear-gradient(135deg, #2563EB, #0EA5E9); }

.g-wrap { max-width: 780px; margin: 0 auto; padding: 8px 24px 56px; }
.g-crumb { font-size: 13px; color: var(--muted); margin: 8px 0 18px; }
.g-crumb a { color: var(--muted); }
.g-crumb span { margin: 0 6px; }

.g-wrap h1 { font-size: 34px; line-height: 1.3; letter-spacing: -.3px; margin: 0 0 12px; }
.g-lead { font-size: 18px; color: var(--sub); margin: 0 0 8px; }
.g-meta { font-size: 13px; color: var(--muted); margin-bottom: 28px; }
.g-wrap h2 { font-size: 23px; line-height: 1.4; margin: 40px 0 10px; padding-top: 4px; }
.g-wrap h3 { font-size: 18px; margin: 26px 0 6px; }
.g-wrap p { margin: 0 0 14px; color: var(--ink-2); }
.g-wrap ul, .g-wrap ol { padding-left: 22px; margin: 0 0 16px; color: var(--ink-2); }
.g-wrap li { margin: 4px 0; }
.g-wrap strong { color: var(--ink); }

.g-toc { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 16px 20px; margin: 0 0 8px; }
.g-toc b { font-size: 14px; color: var(--muted); }
.g-toc ol { margin: 6px 0 0; }

.g-box { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px 20px; margin: 18px 0; }
.g-box.tip { border-left: 4px solid var(--ac); }
.g-box p:last-child { margin-bottom: 0; }
.g-formula { font-family: ui-monospace, 'Cascadia Code', Consolas, monospace; background: var(--soft); border-radius: 10px; padding: 12px 16px; margin: 10px 0 16px; font-size: 15px; line-height: 1.9; overflow-x: auto; }

.g-table-wrap { overflow-x: auto; margin: 12px 0 20px; border: 1px solid var(--line); border-radius: 14px; background: var(--card); }
.g-table { width: 100%; border-collapse: collapse; font-size: 15px; min-width: 520px; }
.g-table th, .g-table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
.g-table th { background: var(--soft); font-size: 13px; color: var(--sub); font-weight: 700; white-space: nowrap; }
.g-table tr:last-child td { border-bottom: none; }
.g-table .num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.g-table tfoot td { font-weight: 700; background: var(--soft); }

/* sample quote drawn in HTML (always white, like printed paper) */
.g-paper { background: #fff; color: #1E293B; border-radius: 8px; box-shadow: 0 20px 44px -22px rgba(15, 23, 42, .45); padding: 28px 30px; margin: 18px 0 24px; font-size: 14px; line-height: 1.6; }
.g-paper .hd { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; border-bottom: 3px solid #2563EB; padding-bottom: 14px; }
.g-paper .hd b { font-size: 16px; display: block; }
.g-paper .hd small, .g-paper .info small { color: #64748B; }
.g-paper .ttl { font-size: 24px; font-weight: 800; letter-spacing: 4px; color: #2563EB; text-align: right; line-height: 1.2; }
.g-paper .info { display: flex; justify-content: space-between; gap: 16px; margin: 14px 0; flex-wrap: wrap; }
.g-paper table { width: 100%; border-collapse: collapse; }
.g-paper th { background: #EAF1FF; color: #2563EB; font-size: 12px; text-align: left; padding: 7px 8px; }
.g-paper td { padding: 8px; border-bottom: 1px solid #E2E8F0; }
.g-paper .num { text-align: right; white-space: nowrap; }
.g-paper .tot { margin: 12px 0 0 auto; width: 240px; }
.g-paper .tot div { display: flex; justify-content: space-between; padding: 3px 0; color: #475569; }
.g-paper .tot .g { background: #2563EB; color: #fff; border-radius: 8px; padding: 8px 12px; font-weight: 800; margin-top: 4px; }
.g-paper .ft { margin-top: 16px; font-size: 12.5px; color: #475569; }

.g-cta-box { margin: 40px 0 8px; border-radius: 20px; padding: 26px 26px; background: linear-gradient(150deg, #2563EB, #0EA5E9); color: #fff; display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.g-cta-box div { flex: 1; min-width: 220px; }
.g-cta-box b { font-size: 20px; display: block; margin-bottom: 4px; }
.g-cta-box p { margin: 0; color: #E0EDFF; }
.g-cta-box a { background: #fff; color: #1D4ED8; text-decoration: none; font-weight: 700; padding: 12px 22px; border-radius: 12px; white-space: nowrap; }

.g-faq details { border-top: 1px solid var(--line); padding: 12px 0; }
.g-faq details:last-child { border-bottom: 1px solid var(--line); }
.g-faq summary { cursor: pointer; font-weight: 700; color: var(--ink); }
.g-faq details p { margin: 8px 0 0; }

.g-related { margin-top: 36px; }
.g-related h2 { font-size: 18px; margin-bottom: 12px; }
.g-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; list-style: none; padding: 0 !important; margin: 0; }
.g-cards li { margin: 0; }
.g-cards a { display: block; height: 100%; background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 16px 18px; text-decoration: none; color: var(--ink); transition: border-color .15s; }
.g-cards a:hover { border-color: var(--ac); }
.g-cards b { display: block; font-size: 16px; margin-bottom: 4px; }
.g-cards span { font-size: 14px; color: var(--sub); line-height: 1.6; display: block; }

.g-foot { max-width: 1080px; margin: 0 auto; padding: 24px; font-size: 13px; color: var(--muted); display: flex; gap: 16px; flex-wrap: wrap; border-top: 1px solid var(--line); }
.g-foot a { color: var(--muted); }

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .g-top { padding: 12px 16px; gap: 8px; }
  .g-nav a:not(.g-cta) { display: none; }
  .g-wrap { padding: 4px 16px 40px; }
  .g-wrap h1 { font-size: 27px; }
  .g-lead { font-size: 16.5px; }
  .g-wrap h2 { font-size: 20px; margin-top: 32px; }
  .g-paper { padding: 18px 16px; font-size: 13px; }
  .g-paper .ttl { font-size: 19px; letter-spacing: 2px; }
  .g-paper .tot { width: 100%; }
  .g-cards { grid-template-columns: minmax(0, 1fr); }
  .g-cta-box { padding: 22px 20px; }
  .g-cta-box a { width: 100%; text-align: center; }
}