:root {
  --ink: #0c1a24;
  --muted: #3d5263;
  --soft: #5c7386;
  --line: #d5e0e8;
  --paper: #f3f7fa;
  --sky: #0277a8;
  --sky-deep: #015a80;
  --amber: #8a5a12;
  --amber-bg: rgba(138, 90, 18, 0.08);
  --font-display: "Shippori Mincho", "Hiragino Mincho ProN", serif;
  --font-body: "Zen Kaku Gothic New", "Hiragino Sans", "Noto Sans TC", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 5.5rem; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(ellipse 80% 40% at 80% -10%, rgba(2, 119, 168, 0.1), transparent 50%),
    linear-gradient(180deg, rgba(12, 26, 36, 0.03), transparent 28%),
    var(--paper);
  line-height: 1.7;
}
a { color: var(--sky); text-decoration: none; }
a:hover { text-decoration: underline; }

.topnav {
  position: sticky; top: 0; z-index: 20;
  padding: 0.75rem 1.25rem 0.7rem;
  background: rgba(243, 247, 250, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.topnav-row {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 0.75rem 1rem;
  max-width: 52rem;
  margin: 0 auto;
}
.topnav-brand { display: inline-flex; align-items: center; line-height: 0; text-decoration: none; }
.topnav-brand img { display: block; height: 1.65rem; width: auto; }
.topnav-product {
  margin-left: 0.55rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--soft);
  text-transform: uppercase;
}
.topnav-links {
  display: flex; flex-wrap: wrap; gap: 0.65rem 0.85rem;
  align-items: center;
  font-size: 0.92rem;
}
.topnav-links a { color: var(--muted); text-decoration: none; }
.topnav-links a:hover,
.topnav-links a[aria-current="page"] { color: var(--sky); }
.topnav-cta {
  display: inline-flex; align-items: center;
  padding: 0.45rem 0.9rem; border-radius: 999px;
  background: var(--sky); color: #fff !important;
  font-weight: 700; font-size: 0.875rem;
  text-decoration: none !important;
}
.topnav-cta:hover { background: var(--sky-deep); }

.lang-menu { position: relative; display: inline-block; }
.lang-menu-btn {
  list-style: none; cursor: pointer;
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--line); border-radius: 999px;
  background: #fff; color: var(--ink);
  font-size: 0.8125rem; font-weight: 700; line-height: 1.2;
}
.lang-menu-btn::-webkit-details-marker { display: none; }
.lang-menu-btn::after { content: "▾"; font-size: 0.7rem; color: var(--soft); }
.lang-menu[open] .lang-menu-btn {
  border-color: var(--sky);
  box-shadow: 0 0 0 2px rgba(2, 119, 168, 0.12);
}
.lang-menu-kicker { color: var(--soft); font-weight: 500; font-size: 0.7rem; }
.lang-menu-panel {
  position: absolute; right: 0; top: calc(100% + 0.35rem); z-index: 30;
  min-width: 11rem; padding: 0.45rem;
  border: 1px solid var(--line); border-radius: 12px;
  background: #fff; box-shadow: 0 10px 28px rgba(12, 26, 36, 0.12);
  display: grid; gap: 0.15rem;
}
.lang-menu-panel a {
  display: block; padding: 0.45rem 0.65rem; border-radius: 8px;
  color: var(--muted); text-decoration: none; font-size: 0.875rem; font-weight: 600;
}
.lang-menu-panel a:hover {
  background: rgba(2, 119, 168, 0.08); color: var(--sky); text-decoration: none;
}
.lang-menu-panel a[aria-current="true"] {
  background: rgba(2, 119, 168, 0.12); color: var(--ink);
}

.wrap {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}
.crumb { margin: 0 0 1rem; font-size: 0.85rem; color: var(--soft); }
.crumb a { color: var(--muted); }
.kicker {
  margin: 0 0 0.5rem;
  font-size: 0.78rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--sky);
}
h1 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.01em;
}
.lede { margin: 0 0 1.75rem; color: var(--muted); font-size: 1.05rem; }

.badge-canonical {
  display: inline-flex; align-items: center; gap: 0.35rem;
  margin: 0 0 1rem;
  padding: 0.28rem 0.65rem;
  border: 1px solid rgba(138, 90, 18, 0.35);
  border-radius: 999px;
  background: var(--amber-bg);
  color: var(--amber);
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.04em;
}

.provenance {
  margin: 0 0 2rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--sky);
  background: #fff;
}
.provenance h2 {
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--soft);
  font-weight: 700;
  font-family: var(--font-body);
}
.provenance dl {
  margin: 0;
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 0.45rem 0.85rem;
  font-size: 0.92rem;
}
.provenance dt { margin: 0; color: var(--soft); font-weight: 600; }
.provenance dd { margin: 0; color: var(--ink); }

.prose h2 {
  margin: 2rem 0 0.65rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
}
.prose p { margin: 0 0 1rem; color: var(--ink); }
.prose ul { margin: 0 0 1.25rem; padding-left: 1.2rem; color: var(--muted); }
.prose li { margin: 0.35rem 0; }

.record-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.85rem; }
.record-card {
  display: block;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  background: #fff;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.record-card:hover {
  border-color: var(--sky);
  text-decoration: none;
  transform: translateY(-1px);
}
.record-card .meta { margin: 0 0 0.35rem; font-size: 0.78rem; color: var(--soft); font-weight: 600; }
.record-card h2 { margin: 0 0 0.35rem; font-size: 1.1rem; font-family: var(--font-display); }
.record-card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.area-label {
  margin: 2rem 0 0.75rem;
  font-size: 0.78rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--soft);
}

.cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }
.cta {
  display: inline-flex; align-items: center;
  padding: 0.65rem 1.1rem;
  background: var(--sky); color: #fff !important;
  font-weight: 700; text-decoration: none !important;
}
.cta:hover { background: var(--sky-deep); }
.cta-ghost {
  display: inline-flex; align-items: center;
  padding: 0.65rem 1.1rem;
  border: 1px solid var(--line);
  background: #fff; color: var(--ink) !important;
  font-weight: 600; text-decoration: none !important;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 1.25rem 2.5rem;
  color: var(--soft);
  font-size: 0.85rem;
}
.footer-inner { max-width: 42rem; margin: 0 auto; }
.footer nav {
  display: flex; flex-wrap: wrap; gap: 0.55rem 0.9rem;
  margin-bottom: 1rem;
}
.footer nav a { color: var(--muted); }
.footer .note { margin: 0.75rem 0 0; }

@media (max-width: 640px) {
  .provenance dl { grid-template-columns: 1fr; gap: 0.15rem; }
  .provenance dt { margin-top: 0.45rem; }
  .provenance dt:first-child { margin-top: 0; }
}