:root {
  --ink: #1b2430;
  --muted: #66727f;
  --line: #e5e9ef;
  --brand: #0f6b4f;
  --brand-soft: #eaf5f0;
  --bg: #f7f9fb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

header.site-head {
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-head .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; color: var(--ink); }
.brand .dot {
  width: 26px; height: 26px; border-radius: 8px;
  background: linear-gradient(135deg, #12a06b, #0f6b4f);
}
nav.top-nav { display: flex; gap: 22px; font-size: 14px; flex-wrap: wrap; }
nav.top-nav a { color: var(--muted); }
nav.top-nav a.active, nav.top-nav a:hover { color: var(--brand); }

main { padding: 40px 0 64px; }

h1 { font-size: 30px; line-height: 1.35; margin: 0 0 12px; }
h2 { font-size: 20px; margin: 34px 0 12px; padding-left: 10px; border-left: 3px solid var(--brand); }
h3 { font-size: 16px; margin: 22px 0 8px; }
p, li { color: #2f3a46; }
.lead { font-size: 16px; color: var(--muted); margin-bottom: 26px; }

.hero {
  background: linear-gradient(135deg, #0f6b4f, #12a06b);
  color: #fff;
  border-radius: 14px;
  padding: 40px 36px;
  margin-bottom: 12px;
}
.hero h1 { color: #fff; }
.hero p { color: rgba(255,255,255,.9); margin: 0; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 18px 0; }
.card { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.card h3 { margin-top: 0; }
.card p { margin: 6px 0 0; font-size: 14px; color: var(--muted); }

table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; margin: 14px 0; }
th, td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--line); font-size: 14px; }
th { background: var(--brand-soft); font-weight: 600; }
tr:last-child td { border-bottom: none; }

pre {
  background: #0f1720; color: #e6edf3; padding: 16px;
  border-radius: 10px; overflow-x: auto; font-size: 13px; line-height: 1.6;
}
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
p code, li code { background: #eef2f6; padding: 1px 5px; border-radius: 4px; font-size: 13px; }

.notice {
  background: #fff8e6; border: 1px solid #f5e1a4; border-radius: 10px;
  padding: 12px 14px; font-size: 13px; color: #7a5a12; margin: 16px 0;
}

footer.site-foot {
  border-top: 1px solid var(--line);
  background: #fff;
  padding: 24px 0 30px;
  font-size: 13px;
  color: var(--muted);
}
footer.site-foot .wrap { display: flex; flex-direction: column; gap: 6px; }
footer.site-foot .row { display: flex; flex-wrap: wrap; gap: 8px 18px; }
footer.site-foot a { color: var(--muted); }

/* 页头右上角：登录 / 免费注册 */
nav.top-nav { align-items: center; }
.nav-sep {
  width: 1px;
  height: 18px;
  background: var(--line);
  margin: 0 4px;
}
.nav-login,
.nav-register {
  display: inline-flex;
  align-items: center;
  height: 32px;
  padding: 0 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
}
.nav-login {
  color: var(--brand);
  border: 1px solid #cfe4dc;
  background: #fff;
}
.nav-login:hover { background: var(--brand-soft); text-decoration: none; }
.nav-register {
  color: #fff;
  background: linear-gradient(135deg, #12a06b, #0f6b4f);
  border: 1px solid transparent;
}
.nav-register:hover { filter: brightness(1.05); text-decoration: none; }

@media (max-width: 720px) {
  .site-head .wrap { height: auto; padding-top: 10px; padding-bottom: 10px; flex-wrap: wrap; gap: 8px; }
  nav.top-nav { gap: 12px; }
}