:root {
  --ink: #1f2a2e;
  --teal: #2f8f9d;
  --teal-dark: #256b76;
  --bg: #f5f7f8;
  --line: #e3e9ea;
  --muted: #6b7a7e;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.7;
}
.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* 导航 */
.nav { border-bottom: 1px solid var(--line); position: sticky; top: 0; background: #fff; z-index: 10; }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { font-size: 20px; font-weight: 700; color: var(--teal-dark); letter-spacing: 2px; }
.nav nav a { margin-left: 24px; color: var(--ink); text-decoration: none; font-size: 15px; }
.nav nav a:hover { color: var(--teal); }

/* Hero */
.hero {
  background: linear-gradient(135deg, #eef6f7 0%, #f8f4ec 100%);
  padding: 96px 0 72px;
}
.hero h1 { font-size: 36px; line-height: 1.35; }
.subtitle { margin-top: 16px; font-size: 17px; color: var(--muted); max-width: 620px; }

/* 板块 */
.section { padding: 64px 0; }
.section-alt { background: var(--bg); }
.section h2 { font-size: 26px; margin-bottom: 24px; color: var(--teal-dark); }
.lead { max-width: 640px; color: var(--muted); margin-bottom: 24px; }

/* 卡片 */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 24px; }
.section-alt .card { background: #fff; }
.card h3 { font-size: 18px; margin-bottom: 10px; color: var(--teal-dark); }
.card p { font-size: 15px; color: var(--muted); }

/* 链上步骤 */
.steps { list-style: none; counter-reset: step; max-width: 640px; }
.steps li {
  counter-increment: step;
  position: relative;
  padding: 0 0 24px 48px;
  border-left: 2px solid var(--line);
  margin-left: 12px;
}
.steps li::before {
  content: counter(step);
  position: absolute; left: -14px; top: 0;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--teal); color: #fff;
  font-size: 14px; display: flex; align-items: center; justify-content: center;
}
.steps strong { display: block; margin-bottom: 4px; }
.steps span { color: var(--muted); font-size: 15px; }

/* 小程序 */
.miniprogram { display: flex; align-items: center; gap: 48px; flex-wrap: wrap; }
.miniprogram > div { flex: 1 1 320px; }
.qrcode-placeholder {
  width: 180px; height: 180px; flex: 0 0 auto;
  border: 2px dashed var(--teal); border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: var(--teal-dark); font-size: 15px; background: #fbfdfd;
}

/* 页脚 */
.footer { border-top: 1px solid var(--line); padding: 32px 0 40px; font-size: 14px; }
.footer .muted { color: var(--muted); margin-top: 6px; }
.muted { color: var(--muted); font-size: 14px; margin-top: 12px; }

@media (max-width: 600px) {
  .hero { padding: 64px 0 48px; }
  .hero h1 { font-size: 28px; }
  .nav nav a { margin-left: 14px; font-size: 14px; }
}