/* 直八云印 · 移动优先 */
:root {
  --ink: #1c2430;
  --muted: #5b6775;
  --line: #e6ebf1;
  --brand: #1565d8;
  --brand-dark: #0e4fae;
  --bg: #f6f8fb;
  --card: #ffffff;
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 1px;
}

.topbar nav a {
  margin-left: 16px;
  font-size: 15px;
  color: var(--muted);
  text-decoration: none;
}

.topbar nav a:hover { color: var(--brand); }

main {
  max-width: 720px;
  margin: 0 auto;
  padding-bottom: 40px;
}

.hero {
  padding: 48px 22px 28px;
  text-align: center;
}

.hero h1 {
  font-size: 30px;
  line-height: 1.3;
  margin: 0 0 12px;
  letter-spacing: 1px;
}

.hero .sub {
  color: var(--muted);
  font-size: 16px;
  margin: 0 auto 24px;
  max-width: 34em;
}

.cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  text-decoration: none;
  font-size: 16px;
  font-weight: 600;
}

.btn:hover { background: var(--brand-dark); }

.btn.ghost {
  background: transparent;
  color: var(--brand);
  border: 1px solid var(--brand);
}

.features {
  display: grid;
  gap: 14px;
  padding: 8px 18px;
}

.feature {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.feature h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.how, .price, .pay {
  padding: 28px 18px 8px;
}

.how h2, .price h2, .pay h2 {
  font-size: 22px;
  margin: 0 0 16px;
}

.steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
}

.steps li {
  counter-increment: step;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px 16px 58px;
  position: relative;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
}

.steps strong { display: block; font-size: 16px; }
.steps span { color: var(--muted); font-size: 14.5px; }

.note {
  padding: 18px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

.price .lead {
  color: var(--muted);
  font-size: 15px;
  margin: 0 0 16px;
}

.price-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 15px;
}

.price-table th, .price-table td {
  padding: 12px 10px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.price-table thead th {
  background: #eef3fa;
  color: var(--muted);
  font-weight: 600;
  font-size: 13.5px;
}

.price-table tbody tr:last-child td { border-bottom: none; }

.price-table .right { text-align: right; }

.rules {
  margin-top: 22px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

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

.rules ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  font-size: 15px;
}

.pay-box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 20px;
}

.pay-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
}

.pay-row span { color: var(--muted); font-size: 14.5px; }
.pay-row strong { font-size: 16px; }
.pay-row .amount { font-size: 24px; color: var(--brand); }

.qr {
  text-align: center;
  padding: 20px 0 8px;
}

.qr img {
  width: 220px;
  max-width: 70%;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.qr p { color: var(--muted); font-size: 14px; margin: 10px 0 0; }

.hint {
  color: var(--muted);
  font-size: 14px;
  text-align: center;
  margin: 4px 0 0;
}

footer {
  text-align: center;
  color: #98a4b3;
  font-size: 13px;
  padding: 26px 16px 34px;
}

@media (min-width: 640px) {
  .hero h1 { font-size: 36px; }
  .features { grid-template-columns: repeat(3, 1fr); }
  .steps { grid-template-columns: repeat(3, 1fr); }
}

/* 小屏手机：标题、订单号等长内容换行，避免被裁切 */
@media (max-width: 420px) {
  .hero h1 { font-size: 26px; letter-spacing: 0.5px; overflow-wrap: break-word; }
  .hero .sub { font-size: 15px; }
  .pay-row { flex-wrap: wrap; row-gap: 4px; }
  .pay-row strong { text-align: right; word-break: break-all; }
  .pay-row .amount { font-size: 22px; word-break: break-all; }
  .topbar { padding: 12px 14px; }
  .topbar nav a { margin-left: 10px; }
}