:root {
  --teal: #0f6b5c;
  --ink: #1c1917;
  --muted: #57534e;
  --line: #e7e5e4;
  --bg: #f3faf7;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  color: var(--ink);
  background:
    radial-gradient(900px 360px at 12% 0, rgba(15, 107, 92, 0.12), transparent 55%),
    linear-gradient(180deg, #e8f6f1 0%, var(--bg) 42%, #f7fbf9 100%);
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}
.top {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 7vw 0; gap: 16px; flex-wrap: wrap;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: clamp(20px, 3vw, 28px); font-weight: 800; letter-spacing: -0.03em;
  color: var(--teal); text-decoration: none;
}
.brand img { display: block; border-radius: 7px; }
.top nav { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.top a { color: var(--muted); text-decoration: none; font-size: 14px; }
.top a:hover { color: var(--teal); }
.lang button {
  border: 1px solid var(--line); background: #fff; color: var(--muted);
  border-radius: 999px; padding: 4px 10px; cursor: pointer; font-size: 12px;
}
.lang button.on { background: var(--teal); color: #fff; border-color: var(--teal); }
.banner {
  margin: 18px 7vw 0; padding: 10px 14px; border-radius: 10px;
  background: rgba(15, 107, 92, 0.08); color: var(--muted); font-size: 13px;
}
main { padding: 4vh 7vw 56px; max-width: 880px; }
.hero { padding: 4vh 0 2vh; }
.eyebrow { color: var(--teal); font-weight: 700; font-size: 13px; letter-spacing: 0.04em; }
.hero h1 {
  font-size: clamp(26px, 4.6vw, 42px); line-height: 1.2; margin: 8px 0 14px; letter-spacing: -0.03em;
}
.lead { font-size: 17px; color: var(--muted); max-width: 38em; }
section { padding: 26px 0; border-top: 1px solid var(--line); }
h2 { font-size: 20px; margin-bottom: 10px; }
p, li { font-size: 16px; color: #292524; margin: 8px 0; }
ul { padding-left: 1.2em; }
.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); border-top: 0; padding-top: 8px; }
.card {
  display: block; text-decoration: none; color: inherit; background: #fff;
  border: 1px solid var(--line); border-radius: 14px; padding: 16px 16px 18px;
  box-shadow: 0 10px 28px rgba(28, 25, 23, 0.04);
}
.card strong { display: block; margin-bottom: 6px; color: var(--teal); }
.card span { color: var(--muted); font-size: 14px; }
footer { padding: 0 7vw 40px; color: var(--muted); font-size: 13px; }
footer a { color: var(--teal); }
body.lang-en .zh { display: none !important; }
body.lang-zh .en { display: none !important; }
body:not(.lang-en):not(.lang-zh) .en { display: none !important; }