:root {
  color-scheme: light dark;
  --background: #f5f7fb;
  --surface: #ffffff;
  --surface-soft: #eef2f7;
  --text: #172033;
  --muted: #5d6778;
  --border: #d8dee9;
  --accent: #246bfd;
  --accent-strong: #1553d4;
  --focus: #ffb000;
  --max-width: 980px;
  --reading-width: 760px;
  --radius: 18px;
  --shadow: 0 12px 32px rgba(23, 32, 51, 0.08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang TC", "Noto Sans TC", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}
a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { color: var(--accent-strong); }
a:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.skip-link { position: absolute; left: -10000px; top: auto; width: 1px; height: 1px; overflow: hidden; }
.skip-link:focus {
  position: fixed;
  left: 16px;
  top: 16px;
  width: auto;
  height: auto;
  padding: 10px 14px;
  z-index: 1000;
  border-radius: 10px;
  background: var(--surface);
  color: var(--accent);
  box-shadow: var(--shadow);
}
.site-header { border-bottom: 1px solid var(--border); background: color-mix(in srgb, var(--surface) 94%, transparent); }
.site-header__inner, .site-footer__inner, .page { width: min(calc(100% - 32px), var(--max-width)); margin-inline: auto; }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: 18px; min-height: 68px; }
.brand { color: var(--text); font-size: 1.03rem; font-weight: 750; text-decoration: none; white-space: nowrap; }
.site-nav { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 8px 16px; }
.site-nav a { font-size: 0.92rem; font-weight: 650; text-decoration: none; }
.page { padding-block: 42px 64px; }
.hero, .document, .card, .journal-item, .journal-preview {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero { padding: clamp(28px, 6vw, 56px); }
.hero--product { padding-block: clamp(42px, 8vw, 74px); }
.hero h1, .document h1 { margin: 0; font-size: clamp(2rem, 7vw, 3.6rem); line-height: 1.14; letter-spacing: -0.03em; }
.hero p { max-width: 42rem; margin: 18px 0 0; color: var(--muted); font-size: 1.08rem; }
.eyebrow { margin: 0 0 8px; color: var(--accent); font-size: 0.82rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 14px 20px; margin-top: 28px; }
.secondary-link { font-weight: 700; }
.section-block { margin-top: 28px; }
.section-heading { margin-bottom: 16px; }
.section-heading h2, .journal-preview h2 { margin: 0; font-size: clamp(1.55rem, 4vw, 2.15rem); line-height: 1.25; }
.section-heading p, .journal-preview p { color: var(--muted); }
.cards, .legal-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.card { display: block; padding: 22px; color: var(--text); text-decoration: none; }
.card:hover { border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); }
.card h2, .card h3 { margin: 0; font-size: 1.12rem; }
.card p { margin: 8px 0 0; color: var(--muted); font-size: 0.93rem; }
.journal-preview { display: flex; align-items: center; justify-content: space-between; gap: 26px; padding: clamp(24px, 5vw, 38px); }
.journal-preview p { max-width: 42rem; margin-bottom: 0; }
.journal-list { margin-top: 22px; }
.journal-item { padding: clamp(24px, 5vw, 38px); }
.journal-item h2 { margin: 4px 0 8px; line-height: 1.3; }
.journal-item h2 a { color: var(--text); text-decoration: none; }
.journal-item p { color: var(--muted); }
.journal-date { margin: 0; font-size: 0.9rem; }
.document { width: min(100%, var(--reading-width)); margin-inline: auto; padding: clamp(24px, 5vw, 48px); }
.document__meta { margin: 12px 0 30px; color: var(--muted); font-size: 0.92rem; }
.document h2 { margin: 2.2em 0 0.55em; font-size: 1.35rem; line-height: 1.35; }
.document h3 { margin: 1.6em 0 0.45em; font-size: 1.08rem; }
.document p, .document ul, .document ol { margin-block: 0.8em; }
.document ul, .document ol { padding-left: 1.4em; }
.document li + li { margin-top: 0.42em; }
.document hr { margin: 2.2rem 0; border: 0; border-top: 1px solid var(--border); }
.notice { margin: 24px 0; padding: 18px 20px; border-left: 5px solid var(--accent); border-radius: 12px; background: var(--surface-soft); }
.notice p:first-child { margin-top: 0; }
.notice p:last-child { margin-bottom: 0; }
.back-link { margin-top: 2.2rem !important; }
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 10px 18px;
  border-radius: 12px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 750;
  text-decoration: none;
}
.button-link:hover { background: var(--accent-strong); color: #ffffff; }
.button-link--disabled { background: var(--surface-soft); color: var(--muted); cursor: default; }
.button-link--disabled:hover { background: var(--surface-soft); color: var(--muted); }
.site-footer { border-top: 1px solid var(--border); background: var(--surface); }
.site-footer__inner { padding-block: 24px 36px; color: var(--muted); font-size: 0.88rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-bottom: 8px; }
.footer-links a { font-weight: 650; }
@media (max-width: 760px) {
  body { font-size: 16px; }
  .site-header__inner { align-items: flex-start; flex-direction: column; padding-block: 14px; }
  .site-nav { justify-content: flex-start; }
  .cards, .legal-grid { grid-template-columns: 1fr; }
  .journal-preview { align-items: flex-start; flex-direction: column; }
  .page { padding-block: 26px 48px; }
}
@media (prefers-color-scheme: dark) {
  :root {
    --background: #0f1420;
    --surface: #171e2b;
    --surface-soft: #202a3a;
    --text: #edf2fa;
    --muted: #aab5c6;
    --border: #303b4e;
    --accent: #76a7ff;
    --accent-strong: #9abdff;
    --shadow: 0 14px 36px rgba(0, 0, 0, 0.28);
  }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }