:root {
  --brand: #0e7c86;
  --brand-dark: #0a5c64;
  --brand-light: #e6f4f5;
  --ink: #16232e;
  --ink-soft: #5a6b78;
  --line: #e3e9ee;
  --bg: #ffffff;
  --bg-alt: #f6f9fb;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(16, 42, 67, 0.08);
  --max: 1140px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner { display: flex; align-items: center; gap: 24px; height: 72px; }

.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--brand);
  color: #fff;
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 17px; letter-spacing: .2px; }
.brand-text small { font-size: 11px; color: var(--ink-soft); letter-spacing: .6px; text-transform: uppercase; }

.nav { display: flex; gap: 26px; margin-left: auto; font-size: 14px; color: var(--ink-soft); }
.nav a { transition: color .18s ease; }
.nav a:hover { color: var(--brand); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform .16s ease, background .18s ease, box-shadow .18s ease;
  cursor: pointer;
}
.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 6px 18px rgba(14, 124, 134, .25); }
.btn-primary:hover { background: var(--brand-dark); transform: translateY(-1px); }
.btn-ghost { border-color: var(--line); color: var(--ink); background: #fff; }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn-lg { padding: 14px 30px; font-size: 16px; }

/* ---------- hero ---------- */
.hero {
  background:
    radial-gradient(900px 420px at 88% -10%, var(--brand-light), transparent 62%),
    var(--bg);
  padding: 72px 0 64px;
}
.hero-inner { display: grid; grid-template-columns: 1.35fr .85fr; gap: 48px; align-items: center; }
.eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--brand-light);
  color: var(--brand-dark);
  font-size: 13px;
  font-weight: 600;
}
.hero h1 { margin: 0 0 18px; font-size: 44px; line-height: 1.25; letter-spacing: -.5px; }
.lead { margin: 0 0 28px; font-size: 16px; color: var(--ink-soft); max-width: 520px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-stats {
  display: flex;
  gap: 40px;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
}
.hero-stats strong { display: block; font-size: 26px; color: var(--brand-dark); }
.hero-stats span { font-size: 13px; color: var(--ink-soft); }

.hero-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}
.hero-card h2 { margin: 0 0 8px; font-size: 20px; }
.hero-card > p { margin: 0 0 18px; font-size: 14px; color: var(--ink-soft); }
.checklist { margin: 0; padding: 0; list-style: none; }
.checklist li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 12px;
  font-size: 14px;
}
.checklist li::before {
  content: "✓";
  position: absolute;
  left: 0; top: 0;
  color: var(--brand);
  font-weight: 700;
}

/* ---------- sections ---------- */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head h2 { margin: 0 0 10px; font-size: 30px; letter-spacing: -.3px; }
.section-head p { margin: 0; color: var(--ink-soft); font-size: 15px; }

.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: #cfe3e5; }
.card-icon {
  display: inline-grid;
  place-items: center;
  width: 40px; height: 40px;
  margin-bottom: 16px;
  border-radius: 10px;
  background: var(--brand-light);
  color: var(--brand-dark);
  font-weight: 700;
  font-size: 14px;
}
.card h3 { margin: 0 0 10px; font-size: 17px; }
.card p { margin: 0; font-size: 14px; color: var(--ink-soft); }

.tile {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 22px;
  text-align: center;
}
.tile span { display: block; font-size: 13px; color: var(--ink-soft); margin-bottom: 6px; }
.tile strong { font-size: 28px; color: var(--brand-dark); }

/* ---------- steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.steps li {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 22px;
}
.step-no {
  display: inline-grid;
  place-items: center;
  width: 30px; height: 30px;
  margin-bottom: 14px;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
}
.steps h4 { margin: 0 0 8px; font-size: 16px; }
.steps p { margin: 0; font-size: 13.5px; color: var(--ink-soft); }

/* ---------- cta ---------- */
.cta-section { padding-bottom: 88px; }
.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  background: linear-gradient(120deg, var(--brand) 0%, var(--brand-dark) 100%);
  color: #fff;
  border-radius: 20px;
  padding: 44px 40px;
}
.cta-inner h2 { margin: 0 0 8px; font-size: 26px; }
.cta-inner p { margin: 0; opacity: .9; font-size: 15px; }
.cta-inner .btn-primary { background: #fff; color: var(--brand-dark); box-shadow: none; }
.cta-inner .btn-primary:hover { background: #eef7f8; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 40px 0; background: #fff; }
.footer-inner { display: flex; justify-content: space-between; gap: 28px; flex-wrap: wrap; align-items: flex-start; }
.footer-inner strong { font-size: 15px; }
.footer-inner p { margin: 6px 0 0; font-size: 13px; color: var(--ink-soft); }
.footer-links { display: flex; gap: 20px; font-size: 14px; color: var(--ink-soft); }
.footer-links a:hover { color: var(--brand); }
.footer-meta { text-align: right; }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 34px; }
  .hero h1 { font-size: 34px; }
  .grid-3, .grid-4, .steps { grid-template-columns: repeat(2, 1fr); }
  .nav { display: none; }
}

@media (max-width: 620px) {
  .grid-3, .grid-4, .steps { grid-template-columns: 1fr; }
  .hero { padding: 48px 0 40px; }
  .hero h1 { font-size: 28px; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .section { padding: 52px 0; }
  .header-cta { display: none; }
  .footer-meta { text-align: left; }
}