:root {
  --ink: #16201c;
  --muted: #65726d;
  --line: #dce6df;
  --paper: #fbfcf8;
  --soft: #eef5ec;
  --green: #1f8f61;
  --sun: #ffb84c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  background:
    radial-gradient(circle at 12% 8%, rgba(255, 184, 76, .18), transparent 28%),
    linear-gradient(135deg, #f7faf3 0%, #eef6ef 52%, #fbf3e7 100%);
}

a {
  color: var(--green);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  border-bottom: 1px solid rgba(22, 32, 28, .08);
  background: rgba(255, 255, 255, .72);
  backdrop-filter: blur(18px);
}

.nav {
  width: min(1040px, calc(100% - 40px));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 900;
}

.logo {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--sun), #78c69b);
  color: #fff;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.hero,
.doc {
  width: min(920px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  padding: 74px 0 48px;
}

.hero h1 {
  margin: 0 0 18px;
  max-width: 720px;
  font-size: clamp(36px, 7vw, 72px);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero p {
  margin: 0;
  max-width: 680px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.8;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  width: min(1040px, calc(100% - 40px));
  margin: 0 auto 72px;
}

.card {
  min-height: 164px;
  padding: 22px;
  border: 1px solid rgba(22, 32, 28, .08);
  border-radius: 22px;
  background: rgba(255, 255, 255, .76);
  box-shadow: 0 12px 34px rgba(21, 36, 29, .08);
}

.card h2 {
  margin: 0 0 10px;
  font-size: 20px;
}

.card p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.doc {
  padding: 48px 0 72px;
}

.doc article {
  padding: 34px;
  border: 1px solid rgba(22, 32, 28, .08);
  border-radius: 24px;
  background: rgba(255, 255, 255, .82);
  box-shadow: 0 12px 34px rgba(21, 36, 29, .08);
}

.doc h1 {
  margin: 0 0 10px;
  font-size: 34px;
}

.doc .meta {
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 14px;
}

.doc h2 {
  margin: 32px 0 12px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 22px;
}

.doc h3 {
  margin: 24px 0 10px;
  font-size: 17px;
}

.doc p,
.doc li {
  color: #34413b;
  font-size: 15px;
  line-height: 1.9;
}

.doc ul {
  padding-left: 22px;
}

.notice {
  padding: 14px 16px;
  border-radius: 16px;
  background: #fff6e6;
  color: #684413;
  font-size: 14px;
  line-height: 1.7;
}

.support-box {
  margin-top: 22px;
  padding: 22px;
  border-radius: 20px;
  background: var(--soft);
}

.support-box strong {
  display: block;
  margin-bottom: 8px;
  font-size: 18px;
}

.site-footer {
  border-top: 1px solid rgba(22, 32, 28, .08);
  background: rgba(255, 255, 255, .62);
}

.footer-inner {
  width: min(1040px, calc(100% - 40px));
  margin: 0 auto;
  padding: 26px 0;
  color: var(--muted);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
}

@media (max-width: 760px) {
  .nav,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .cards {
    grid-template-columns: 1fr;
  }

  .doc article {
    padding: 24px 18px;
  }
}