:root {
  --bg: #f4f7f5;
  --bg-accent: #e7f0eb;
  --ink: #14241c;
  --muted: #4d6358;
  --line: #c9d8cf;
  --brand: #0f5c4c;
  --brand-soft: #1a7a65;
  --card: #ffffff;
  --shadow: 0 12px 40px rgba(15, 92, 76, 0.08);
  --radius: 18px;
  --max: 720px;
  --font-display: "Fraunces", "Songti SC", "Songti TC", serif;
  --font-body: "Manrope", "PingFang SC", "Hiragino Sans GB", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 500px at 10% -10%, #d9ebe3 0%, transparent 55%),
    radial-gradient(900px 400px at 100% 0%, #eef5f1 0%, transparent 50%),
    var(--bg);
  line-height: 1.65;
  min-height: 100vh;
}

a { color: var(--brand); text-underline-offset: 3px; }
a:hover { color: var(--brand-soft); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(244, 247, 245, 0.82);
  border-bottom: 1px solid rgba(201, 216, 207, 0.7);
}

.site-header-inner {
  max-width: calc(var(--max) + 80px);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-decoration: none;
  color: inherit;
}
.brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--brand);
}
.brand-sub {
  font-size: 0.75rem;
  color: var(--muted);
}

.nav {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.9rem;
  padding: 6px 10px;
  border-radius: 999px;
}
.nav a[aria-current="page"],
.nav a:hover {
  color: var(--brand);
  background: var(--bg-accent);
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: var(--card);
}
.lang-switch button {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.8rem;
  padding: 6px 10px;
  cursor: pointer;
}
.lang-switch button[aria-pressed="true"] {
  background: var(--brand);
  color: white;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 40px 20px 72px;
}

.hero {
  margin-bottom: 28px;
}
.hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin: 0 0 10px;
}
.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
}
.meta {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  font-size: 0.85rem;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid rgba(201, 216, 207, 0.85);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 22px 8px;
  margin-bottom: 18px;
}

h2 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin: 0 0 10px;
  letter-spacing: -0.02em;
}
h3 {
  font-size: 1rem;
  margin: 18px 0 6px;
}
p, li { color: var(--ink); }
.card p, .card li { color: #24362d; }
ul { padding-left: 1.15rem; margin: 0 0 14px; }
li { margin-bottom: 6px; }
.card > *:last-child { margin-bottom: 16px; }

.contact-box {
  display: grid;
  gap: 10px;
  padding: 16px;
  border-radius: 14px;
  background: linear-gradient(180deg, #edf6f2, #e4efe9);
  border: 1px solid var(--line);
  margin-bottom: 16px;
}
.contact-box strong { color: var(--brand); }

.faq details {
  border-top: 1px solid var(--line);
  padding: 12px 0;
}
.faq details:first-of-type { border-top: 0; }
.faq summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ink);
}
.faq details p {
  margin: 8px 0 0;
  color: var(--muted);
}

.site-footer {
  max-width: calc(var(--max) + 80px);
  margin: 0 auto;
  padding: 0 20px 40px;
  color: var(--muted);
  font-size: 0.85rem;
}

.home-grid {
  display: grid;
  gap: 14px;
}
.home-link {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, border-color 0.18s ease;
}
.home-link:hover {
  transform: translateY(-2px);
  border-color: var(--brand);
}
.home-link h2 {
  margin: 0 0 6px;
  color: var(--brand);
}
.home-link p {
  margin: 0;
  color: var(--muted);
}

[data-lang="en"] .lang-zh { display: none !important; }
[data-lang="zh"] .lang-en { display: none !important; }

@media (max-width: 560px) {
  .site-header-inner { align-items: flex-start; flex-direction: column; }
  .card { padding: 18px 16px 4px; }
}