:root {
  --navy: #1f3a5f;
  --navy-dark: #172c49;
  --ink: #1d2733;
  --muted: #5a6675;
  --line: #dde2e8;
  --bg: #ffffff;
  --bg-alt: #f5f6f8;
  --accent: #9a7b3f;
  --radius: 8px;
  --font: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", "Heiti TC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-serif: "Noto Serif TC", "Songti TC", "PMingLiU", Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body { margin: 0; font-family: var(--font); color: var(--ink); background: var(--bg); line-height: 1.75; font-size: 16px; }
img { max-width: 100%; height: auto; }
a { color: var(--navy); }
a:hover { color: var(--accent); }

/* language switching */
html[data-lang="zh"] .en { display: none !important; }
html[data-lang="en"] .zh { display: none !important; }

.wrap { width: min(1080px, 100% - 40px); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 0; background: var(--navy); color: #fff; padding: 8px 14px; z-index: 100; }
.skip:focus { left: 8px; top: 8px; }

/* header */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(6px); }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-family: var(--font-serif); font-size: 1.05rem; color: var(--navy); }
.brand-text small { font-size: .72rem; color: var(--muted); letter-spacing: .02em; }
.nav { display: flex; align-items: center; gap: 22px; }
.nav a { text-decoration: none; color: var(--ink); font-size: .95rem; padding: 6px 0; border-bottom: 2px solid transparent; }
.nav a:hover { border-color: var(--accent); color: var(--ink); }
.lang-toggle { font: inherit; font-size: .85rem; background: transparent; border: 1px solid var(--navy); color: var(--navy); padding: 4px 12px; border-radius: 999px; cursor: pointer; }
.lang-toggle:hover { background: var(--navy); color: #fff; }
.nav-toggle { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--navy); margin: 5px 0; }

/* hero */
.hero { background: linear-gradient(180deg, #f3f5f8 0%, #fff 100%); border-bottom: 1px solid var(--line); }
.hero-inner { padding: 88px 0 72px; max-width: 820px; margin-inline: 0; }
.hero .wrap { margin-left: max(20px, calc((100% - 1080px) / 2)); }
.eyebrow { color: var(--accent); font-weight: 600; letter-spacing: .06em; font-size: .85rem; margin: 0 0 14px; text-transform: uppercase; }
h1 { font-family: var(--font-serif); font-size: clamp(1.9rem, 4.6vw, 2.9rem); line-height: 1.3; color: var(--navy); margin: 0 0 18px; font-weight: 700; }
.lead { font-size: 1.1rem; color: var(--muted); margin: 0 0 28px; max-width: 640px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn { display: inline-block; padding: 11px 24px; border: 1px solid var(--navy); border-radius: var(--radius); text-decoration: none; color: var(--navy); font-weight: 600; background: #fff; }
.btn:hover { background: var(--bg-alt); color: var(--navy); }
.btn.primary { background: var(--navy); color: #fff; }
.btn.primary:hover { background: var(--navy-dark); color: #fff; }

/* facts */
.facts { border-bottom: 1px solid var(--line); background: #fff; }
.facts-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.fact { padding: 26px 18px; border-left: 1px solid var(--line); font-size: .92rem; color: var(--muted); display: flex; flex-direction: column; gap: 4px; }
.fact:first-child { border-left: 0; padding-left: 0; }
.num { font-family: var(--font-serif); font-size: 1.9rem; color: var(--navy); font-weight: 700; line-height: 1.2; }
.num sup { font-size: .9rem; }

/* sections */
.section { padding: 76px 0; }
.section.alt { background: var(--bg-alt); border-block: 1px solid var(--line); }
h2 { font-family: var(--font-serif); color: var(--navy); font-size: 1.7rem; margin: 0 0 28px; position: relative; padding-bottom: 12px; }
h2::after { content: ""; position: absolute; left: 0; bottom: 0; width: 44px; height: 3px; background: var(--accent); }
.two-col { display: grid; grid-template-columns: 1fr 2fr; gap: 40px; align-items: start; }
.two-col h2 { margin-bottom: 0; }
.prose p { margin: 0 0 16px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.card h3 { margin: 0 0 12px; font-size: 1.1rem; color: var(--navy); font-family: var(--font-serif); }
.card ul { margin: 0; padding-left: 1.2em; color: var(--ink); }
.card li { margin: 4px 0; }
.note { margin: 26px 0 0; color: var(--muted); }

.chips { list-style: none; padding: 0; margin: 20px 0; display: flex; flex-wrap: wrap; gap: 8px; }
.chips li { background: var(--bg-alt); border: 1px solid var(--line); border-radius: 999px; padding: 4px 14px; font-size: .9rem; color: var(--navy); }
.callout { border-left: 3px solid var(--accent); background: var(--bg-alt); padding: 14px 18px; border-radius: 0 var(--radius) var(--radius) 0; margin: 0; }

.contact-grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: 32px; align-items: stretch; }
.contact-list { margin: 0; }
.contact-list > div { padding: 14px 0; border-bottom: 1px solid var(--line); }
.contact-list dt { font-size: .8rem; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.contact-list dd { margin: 2px 0 0; font-size: 1.02rem; }
.map { min-height: 320px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.map iframe { width: 100%; height: 100%; min-height: 320px; border: 0; display: block; }

.site-footer { background: var(--navy-dark); color: #cfd8e3; padding: 28px 0; font-size: .9rem; }
.site-footer p { margin: 0 0 6px; }
.site-footer .small { font-size: .8rem; color: #9fb0c4; }

/* responsive */
@media (max-width: 860px) {
  .two-col, .contact-grid { grid-template-columns: 1fr; gap: 24px; }
  .two-col h2 { margin-bottom: 8px; }
  .cards { grid-template-columns: 1fr 1fr; }
  .facts-grid { grid-template-columns: 1fr 1fr; }
  .fact:nth-child(3) { border-left: 0; padding-left: 0; }
  .fact:nth-child(n+3) { border-top: 1px solid var(--line); }
}
@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav { display: none; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; background: #fff; border-bottom: 1px solid var(--line); padding: 8px 20px 16px; }
  .nav.open { display: flex; }
  .nav a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .lang-toggle { margin-top: 12px; align-self: flex-start; }
  .hero-inner { padding: 56px 0 48px; }
  .section { padding: 52px 0; }
}
@media (max-width: 560px) {
  .cards { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }