:root {
  --bg: #f3f6f8;
  --paper: #ffffff;
  --ink: #14212b;
  --muted: #5a6b78;
  --line: #d7e0e7;
  --accent: #0f6e56;
  --accent-soft: #e7f4ef;
  --max: 760px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #d9ebe4 0%, transparent 55%),
    radial-gradient(900px 420px at 100% 0%, #e8eef5 0%, transparent 50%),
    var(--bg);
  line-height: 1.7;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 24px 20px 64px; }
.top {
  display: flex; flex-wrap: wrap; gap: 12px 20px;
  align-items: center; justify-content: space-between;
  margin-bottom: 28px;
}
.brand {
  font-weight: 700; font-size: 1.15rem; color: var(--ink); letter-spacing: 0.02em;
}
.brand span { color: var(--accent); }
.nav { display: flex; flex-wrap: wrap; gap: 12px 16px; font-size: 0.92rem; }
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px 26px;
  box-shadow: 0 10px 30px rgba(20, 33, 43, 0.04);
}
h1 {
  margin: 0 0 12px;
  font-size: clamp(1.55rem, 3.4vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.lead {
  margin: 0 0 18px;
  padding: 14px 16px;
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  border-radius: 0 10px 10px 0;
  font-size: 1.05rem;
}
h2 { margin: 28px 0 10px; font-size: 1.25rem; }
h3 { margin: 18px 0 8px; font-size: 1.05rem; }
p, li { color: var(--ink); }
.muted { color: var(--muted); }
.meta { font-size: 0.88rem; color: var(--muted); margin-bottom: 18px; }
.faq details {
  border-top: 1px solid var(--line);
  padding: 12px 0;
}
.faq details:first-child { border-top: 0; }
.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
  content: "+";
  display: inline-block;
  width: 1.2em;
  color: var(--accent);
  font-weight: 700;
}
.faq details[open] summary::before { content: "–"; }
.faq p { margin: 8px 0 0 1.2em; color: var(--muted); }
.cta {
  margin-top: 28px;
  display: flex; flex-wrap: wrap; gap: 10px;
}
.btn {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff !important;
  text-decoration: none !important;
  font-weight: 600;
  font-size: 0.95rem;
}
.btn.secondary {
  background: transparent;
  color: var(--accent) !important;
  border: 1px solid var(--accent);
}
.foot {
  margin-top: 28px;
  font-size: 0.85rem;
  color: var(--muted);
}
.en { margin-top: 36px; padding-top: 24px; border-top: 1px dashed var(--line); }
.list { margin: 0; padding-left: 1.2em; }
.grid {
  display: grid;
  gap: 12px;
  margin: 16px 0 0;
}
@media (min-width: 640px) {
  .grid { grid-template-columns: 1fr 1fr; }
}
.tile {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fbfcfd;
  color: var(--ink);
  text-decoration: none !important;
}
.tile strong { display: block; margin-bottom: 4px; color: var(--accent); }
.tile span { font-size: 0.92rem; color: var(--muted); }