:root {
  --ink: #0f172a; --muted: #64748b; --line: #e2e8f0;
  --brand: #2563eb; --brand-dark: #1d4ed8; --bg: #f8fafc;
  --ok: #16a34a; --warn: #d97706; --bad: #dc2626;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font: 15px/1.7 -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
  color: var(--ink); background: #fff;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 顶栏 */
header {
  position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--line);
}
nav {
  max-width: 1040px; margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; gap: 22px;
}
nav .logo { font-weight: 700; font-size: 17px; color: var(--ink); }
nav .logo span { color: var(--brand); }
nav .grow { flex: 1; }
nav a { color: var(--muted); font-size: 14px; }
nav a.on, nav a:hover { color: var(--ink); text-decoration: none; }

main { max-width: 1040px; margin: 0 auto; padding: 0 20px 80px; }

/* 首屏 */
.hero { padding: 76px 0 60px; }
.hero h1 { font-size: 40px; line-height: 1.25; letter-spacing: -.5px; }
.hero h1 em { font-style: normal; color: var(--brand); }
.hero p.sub { margin-top: 18px; font-size: 17px; color: var(--muted); max-width: 620px; }
.cta { margin-top: 30px; display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

.btn {
  display: inline-block; padding: 11px 22px; border-radius: 8px;
  background: var(--brand); color: #fff; font-size: 15px; border: 0; cursor: pointer;
  font-family: inherit;
}
.btn:hover { background: var(--brand-dark); text-decoration: none; }
.btn.ghost { background: #fff; color: var(--ink); border: 1px solid var(--line); }
.btn.ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn.small { padding: 3px 10px; font-size: 12px; margin-left: 8px; }
.btn:disabled { background: #e2e8f0; color: #94a3b8; cursor: default; }

/* 分区 */
section { padding: 46px 0; border-top: 1px solid var(--line); }
section h2 { font-size: 24px; margin-bottom: 10px; }
section .lead { color: var(--muted); margin-bottom: 26px; max-width: 640px; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.card {
  border: 1px solid var(--line); border-radius: 12px; padding: 20px; background: #fff;
}
.card h3 { font-size: 16px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 14px; }
.card .tag {
  display: inline-block; font-size: 12px; padding: 2px 9px; border-radius: 999px;
  background: #eff6ff; color: var(--brand); margin-bottom: 10px;
}

/* 对比表 */
table.cmp { width: 100%; border-collapse: collapse; font-size: 14px; }
table.cmp th, table.cmp td { padding: 12px 14px; border-bottom: 1px solid var(--line); text-align: left; }
table.cmp th { font-size: 13px; color: var(--muted); font-weight: 500; }
table.cmp td:first-child { color: var(--muted); width: 34%; }
table.cmp .no { color: var(--muted); }
table.cmp .yes { color: var(--ok); font-weight: 600; }

/* 价格 */
.price-card { border: 1px solid var(--line); border-radius: 14px; padding: 28px; max-width: 380px; }
.price-card.hi { border-color: var(--brand); box-shadow: 0 6px 24px rgba(37,99,235,.1); }
.price { font-size: 38px; font-weight: 700; }
.price small { font-size: 15px; font-weight: 400; color: var(--muted); }
.price-card ul { list-style: none; margin: 20px 0; }
.price-card li { padding: 6px 0 6px 24px; position: relative; font-size: 14px; }
.price-card li::before {
  content: "✓"; position: absolute; left: 0; color: var(--ok); font-weight: 700;
}

/* 表单 */
.form { max-width: 380px; }
.form input {
  width: 100%; padding: 11px 13px; margin-bottom: 11px; font-size: 15px;
  border: 1px solid var(--line); border-radius: 8px; font-family: inherit;
}
.form input:focus { outline: none; border-color: var(--brand); }
.form .btn { width: 100%; }
.msg { font-size: 14px; margin-top: 12px; min-height: 20px; color: var(--muted); }
.msg.ok { color: var(--ok); }
.msg.bad { color: var(--bad); }
.switch { margin-top: 14px; font-size: 14px; color: var(--muted); }

/* 我的账号 */
.panel { border: 1px solid var(--line); border-radius: 12px; padding: 22px; max-width: 560px; }
.panel .row { display: flex; justify-content: space-between; padding: 9px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.panel .row:last-child { border: 0; }
.panel .row span:first-child { color: var(--muted); }
.state { padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.state.ok { background: #dcfce7; color: #15803d; }
.state.bad { background: #fee2e2; color: #b91c1c; }

/* 步骤 */
ol.steps { counter-reset: s; list-style: none; }
ol.steps li {
  counter-increment: s; position: relative; padding: 0 0 20px 44px; margin-bottom: 4px;
  border-left: 2px solid var(--line); margin-left: 14px;
}
ol.steps li:last-child { border-left-color: transparent; padding-bottom: 0; }
ol.steps li::before {
  content: counter(s); position: absolute; left: -15px; top: -2px;
  width: 28px; height: 28px; border-radius: 50%; background: var(--brand); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 600;
}
ol.steps b { display: block; margin-bottom: 3px; }
ol.steps p { color: var(--muted); font-size: 14px; }

code {
  background: var(--bg); padding: 2px 6px; border-radius: 5px;
  font: 13px/1.6 Consolas, monospace; color: #334155;
}

footer {
  border-top: 1px solid var(--line); padding: 26px 20px; color: var(--muted); font-size: 13px;
}
footer div { max-width: 1040px; margin: 0 auto; }

.note {
  background: var(--bg); border-left: 3px solid var(--warn); padding: 14px 16px;
  border-radius: 0 8px 8px 0; font-size: 14px; color: #475569; margin-top: 18px;
}

@media (max-width: 640px) {
  .hero { padding: 48px 0 36px; }
  .hero h1 { font-size: 29px; }
  nav { gap: 14px; }
}

/* 开通 / 续费 */
.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(148px, 1fr)); gap: 12px; }
.plan {
  display: flex; flex-direction: column; gap: 4px; align-items: flex-start;
  padding: 16px; border: 1px solid var(--line); border-radius: 12px;
  background: #fff; cursor: pointer; text-align: left; font: inherit;
}
.plan:hover { border-color: var(--brand); }
.plan[disabled] { opacity: .55; cursor: default; }
.plan-name { font-size: 13px; color: var(--muted); }
.plan-price { font-size: 22px; font-weight: 700; }
.plan-days { font-size: 12px; color: var(--muted); }
.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px; word-break: break-all;
}
.mono.big { font-size: 19px; font-weight: 700; color: var(--brand); }
.warn {
  margin-top: 14px; padding: 14px 16px; border-radius: 10px;
  background: #fef3c7; color: #92400e; font-size: 13px; line-height: 1.75;
}