:root {
  --bg: #ffffff;
  --bg-alt: #f5f7f6;
  --text: #1d2420;
  --muted: #5b6660;
  --accent: #0f8a5f;
  --accent-ink: #ffffff;
  --line: #e2e8e4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121614;
    --bg-alt: #181d1a;
    --text: #e8eeea;
    --muted: #a3ada7;
    --accent: #3cc58f;
    --accent-ink: #0b1a12;
    --line: #2a322d;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.75 -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.top { position: sticky; top: 0; background: var(--bg); border-bottom: 1px solid var(--line); z-index: 10; }
.top-in { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 12px; }
.brand { font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; }
.brand span { margin-left: 8px; font-size: 12px; letter-spacing: 2px; color: var(--muted); font-weight: 500; }
nav { display: flex; gap: 18px; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--accent); }
.hero { padding: 88px 0 72px; background: linear-gradient(160deg, var(--bg-alt), var(--bg)); }
.eyebrow { color: var(--accent); font-weight: 600; margin: 0 0 8px; }
h1 { font-size: clamp(30px, 5vw, 46px); line-height: 1.25; margin: 0 0 16px; }
.lead { font-size: 18px; color: var(--muted); max-width: 680px; margin: 0 0 28px; }
.btn { display: inline-block; background: var(--accent); color: var(--accent-ink); padding: 10px 22px; border-radius: 6px; text-decoration: none; font-weight: 600; }
.block { padding: 64px 0; }
.block.alt { background: var(--bg-alt); }
h2 { font-size: 26px; margin: 0 0 20px; }
h3 { font-size: 19px; margin: 0 0 8px; }
.grid.three { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 22px; }
.block.alt .card { background: var(--bg); }
.card h3 { margin: 0; }
.tag { display: inline-block; font-size: 13px; color: var(--accent) !important; font-weight: 600; }
.form { font-size: 14px; color: var(--text) !important; }
.note { margin-top: 24px; font-size: 14px; color: var(--muted); }
.foot { border-top: 1px solid var(--line); padding: 24px 0; font-size: 14px; color: var(--muted); text-align: center; }
.foot p { margin: 4px 0; }
.foot a { color: var(--muted); }
@media (max-width: 760px) {
  .grid.three { grid-template-columns: 1fr; }
  nav { gap: 12px; flex-wrap: nowrap; }
  nav a { font-size: 14px; white-space: nowrap; }
  .brand span { display: none; }
  .hero { padding: 56px 0 48px; }
}