:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --bg-soft-2: #eef2f8;
  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --ink: #0f172a;
  --ink-2: #334155;
  --ink-3: #64748b;
  --brand: #1d4ed8;
  --brand-dark: #1e3a8a;
  --brand-soft: #eff4ff;
  --ok: #047857;
  --warn: #b45309;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.06), 0 8px 24px -12px rgba(15, 23, 42, 0.18);
  --max: 1080px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei",
    "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

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

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
}

.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; font-size: 18px; }
.brand:hover { text-decoration: none; }

.brand-mark {
  width: 30px; height: 30px; border-radius: 8px; flex: none;
  background: linear-gradient(135deg, var(--brand) 0%, #4f8ef7 100%);
  color: #fff; display: grid; place-items: center;
  font-size: 15px; font-weight: 700; letter-spacing: -0.5px;
}

.site-nav { display: flex; gap: 26px; font-size: 15px; }
.site-nav a { color: var(--ink-2); }
.site-nav a:hover { color: var(--brand); text-decoration: none; }

/* ---------- hero ---------- */
.hero {
  background:
    radial-gradient(1000px 380px at 12% -10%, #e4edff 0%, rgba(255, 255, 255, 0) 70%),
    var(--bg);
  border-bottom: 1px solid var(--line);
  padding: 76px 0 68px;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: 40px;
  line-height: 1.32;
  letter-spacing: -0.4px;
  max-width: 20em;
}

.hero .lead {
  margin: 0 0 30px;
  font-size: 18px;
  color: var(--ink-2);
  max-width: 44em;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-ghost { background: #fff; color: var(--ink-2); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }

.hero-note { margin: 20px 0 0; font-size: 14px; color: var(--ink-3); }

/* ---------- sections ---------- */
section { padding: 64px 0; }
section + section { border-top: 1px solid var(--line); }
.section-soft { background: var(--bg-soft); }

h2 { margin: 0 0 10px; font-size: 26px; letter-spacing: -0.2px; }
.section-sub { margin: 0 0 34px; color: var(--ink-3); font-size: 15px; }

.grid { display: grid; gap: 18px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--ink-2); font-size: 15px; }

/* ---------- platforms ---------- */
.platform-list { display: grid; gap: 14px; grid-template-columns: repeat(3, 1fr); }

.platform {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}

.platform-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 8px; }
.platform-name { font-weight: 700; font-size: 16px; }

.tag {
  font-size: 12px; padding: 2px 9px; border-radius: 999px; font-weight: 600; white-space: nowrap;
}
.tag-full { background: #e7f6ee; color: var(--ok); }
.tag-part { background: #fdf3e3; color: var(--warn); }

.platform p { margin: 0; font-size: 14px; color: var(--ink-2); }

/* ---------- pricing ---------- */
.plans { display: grid; gap: 18px; grid-template-columns: repeat(4, 1fr); }

.plan {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
}
.plan.featured { border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }
.plan-name { font-weight: 700; font-size: 16px; margin-bottom: 6px; }
.plan-price { font-size: 30px; font-weight: 700; letter-spacing: -0.5px; }
.plan-price small { font-size: 14px; font-weight: 500; color: var(--ink-3); margin-left: 4px; }
.plan-year { font-size: 13px; color: var(--ink-3); margin-top: 2px; }
.plan ul { margin: 16px 0 0; padding: 0; list-style: none; font-size: 14px; color: var(--ink-2); }
.plan li { padding: 5px 0 5px 20px; position: relative; }
.plan li::before {
  content: ""; position: absolute; left: 2px; top: 13px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--brand);
}

.plan-note { margin: 26px 0 0; font-size: 14px; color: var(--ink-3); }

/* ---------- contact ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.contact-grid .label { font-size: 13px; color: var(--ink-3); margin-bottom: 4px; }
.contact-grid .value { font-size: 16px; font-weight: 600; color: var(--ink); word-break: break-all; }
.contact-grid .value.mono { font-size: 20px; letter-spacing: 0.5px; }

/* ---------- table (legal pages) ---------- */
.legal { max-width: 800px; }
.legal h1 { font-size: 28px; margin: 0 0 6px; }
.legal .meta { color: var(--ink-3); font-size: 14px; margin-bottom: 32px; }
.legal h2 { font-size: 19px; margin: 32px 0 10px; }
.legal p, .legal li { color: var(--ink-2); font-size: 15px; }
.legal ul { padding-left: 22px; }

/* ---------- footer ---------- */
.site-footer {
  background: var(--bg-soft-2);
  border-top: 1px solid var(--line);
  padding: 34px 0;
  font-size: 14px;
  color: var(--ink-3);
}
.footer-inner { display: flex; flex-wrap: wrap; gap: 10px 28px; justify-content: space-between; align-items: center; }
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--ink-3); }

@media (max-width: 900px) {
  .grid-3, .platform-list, .plans, .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 32px; }
}

@media (max-width: 620px) {
  .site-nav { display: none; }
  .grid-3, .grid-2, .platform-list, .plans, .contact-grid { grid-template-columns: 1fr; }
  .hero { padding: 52px 0 46px; }
  .hero h1 { font-size: 27px; }
  section { padding: 46px 0; }
}