:root {
  --blue-50: #eef4ff;
  --blue-100: #dbe7ff;
  --blue-200: #b9d0ff;
  --blue-300: #8ab2ff;
  --blue-400: #4f8bff;
  --blue-500: #2563eb;
  --blue-600: #1d4ed8;
  --blue-700: #0a3da8;
  --blue-900: #0b1b3a;
  --cyan: #22d3ee;
  --ink: #0f1b33;
  --muted: #5b6b85;
  --line: #e6ecf7;
  --bg: #ffffff;
  --bg-soft: #f5f8ff;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow-sm: 0 4px 16px rgba(15, 40, 90, 0.06);
  --shadow: 0 18px 50px rgba(15, 40, 90, 0.10);
  --shadow-blue: 0 20px 60px rgba(37, 99, 235, 0.25);
  --maxw: 1180px;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
h1, h2, h3, h4 { margin: 0; line-height: 1.25; font-weight: 700; letter-spacing: -.01em; }
p { margin: 0; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.section--soft { background: var(--bg-soft); }
.section--dark {
  background: radial-gradient(1200px 600px at 80% -10%, rgba(34,211,238,.18), transparent 60%),
              linear-gradient(180deg, #0b1b3a 0%, #0a1730 100%);
  color: #eaf1ff;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; letter-spacing: .08em;
  color: var(--blue-500); text-transform: uppercase;
  background: var(--blue-50); border: 1px solid var(--blue-100);
  padding: 6px 14px; border-radius: 999px;
}
.eyebrow--light { color: var(--cyan); background: rgba(34,211,238,.12); border-color: rgba(34,211,238,.25); }
.section-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 40px); margin: 18px 0 14px; }
.section-head p { color: var(--muted); font-size: 17px; }
.section--dark .section-head p { color: #a9bfe6; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; font-weight: 600; font-size: 15px;
  border: 1px solid transparent; cursor: pointer; transition: .25s ease; white-space: nowrap;
}
.btn--primary { background: linear-gradient(135deg, var(--blue-400), var(--blue-600)); color: #fff; box-shadow: var(--shadow-blue); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 26px 70px rgba(37,99,235,.35); }
.btn--ghost { background: #fff; color: var(--blue-600); border-color: var(--blue-200); }
.btn--ghost:hover { border-color: var(--blue-400); background: var(--blue-50); }
.btn--light { background: rgba(255,255,255,.1); color: #fff; border-color: rgba(255,255,255,.25); backdrop-filter: blur(6px); }
.btn--light:hover { background: rgba(255,255,255,.18); }
.btn--lg { padding: 16px 34px; font-size: 16px; }

/* Header */
.header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.78); backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent; transition: .3s;
}
.header.scrolled { border-color: var(--line); box-shadow: var(--shadow-sm); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 19px; color: var(--ink); }
.brand img { width: 34px; height: 34px; }
.brand small { font-size: 11px; font-weight: 600; color: var(--blue-500); letter-spacing: .12em; display: block; line-height: 1; margin-top: 2px; }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a { font-size: 15px; color: var(--muted); font-weight: 500; transition: .2s; }
.nav-links a:hover { color: var(--blue-600); }
.nav-cta { display: flex; align-items: center; gap: 12px; }
.menu-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.menu-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 4px 0; transition: .3s; }

/* Hero */
.hero { position: relative; overflow: hidden; padding: 80px 0 96px; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(700px 420px at 12% 8%, rgba(79,139,255,.16), transparent 60%),
    radial-gradient(620px 480px at 92% 30%, rgba(34,211,238,.14), transparent 60%);
}
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: 0; opacity: .5;
  background-image: radial-gradient(rgba(37,99,235,.10) 1px, transparent 1px);
  background-size: 26px 26px; -webkit-mask-image: radial-gradient(80% 60% at 50% 30%, #000, transparent);
}
.hero .container { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr .95fr; gap: 40px; align-items: center; }
.hero h1 { font-size: clamp(34px, 5vw, 56px); margin: 22px 0 18px; }
.hero h1 .grad { background: linear-gradient(120deg, var(--blue-500), var(--cyan)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-lead { font-size: 18px; color: var(--muted); max-width: 520px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.hero-trust { display: flex; gap: 26px; margin-top: 34px; flex-wrap: wrap; }
.hero-trust .t { font-size: 14px; color: var(--muted); display: flex; align-items: center; gap: 8px; }
.hero-trust .t b { color: var(--blue-700); font-size: 15px; }
.hero-visual { position: relative; }
.hero-visual .frame {
  border-radius: 22px; overflow: hidden; box-shadow: var(--shadow);
  border: 1px solid var(--blue-100); background: #0b1730;
}
.hero-visual img { width: 100%; height: auto; display: block; }
.hero-badge {
  position: absolute; left: -14px; bottom: 26px; background: #fff; border: 1px solid var(--line);
  border-radius: 14px; padding: 12px 16px; box-shadow: var(--shadow); display: flex; gap: 12px; align-items: center;
}
.hero-badge .dot { width: 38px; height: 38px; border-radius: 10px; background: linear-gradient(135deg, var(--blue-400), var(--blue-600)); display: grid; place-items: center; color: #fff; font-size: 18px; }
.hero-badge b { font-size: 14px; }
.hero-badge span { font-size: 12px; color: var(--muted); }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: -52px; position: relative; z-index: 2; }
.stat {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px;
  box-shadow: var(--shadow-sm); text-align: center;
}
.stat .num { font-size: 34px; font-weight: 800; color: var(--blue-600); letter-spacing: -.02em; }
.stat .num span { font-size: 20px; }
.stat .lbl { color: var(--muted); font-size: 14px; margin-top: 4px; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.step {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 24px;
  position: relative; transition: .25s;
}
.step:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--blue-200); }
.step .idx { font-size: 14px; font-weight: 800; color: var(--blue-400); letter-spacing: .1em; }
.step .ic { width: 52px; height: 52px; border-radius: 14px; background: var(--blue-50); color: var(--blue-600); display: grid; place-items: center; margin: 14px 0 16px; }
.step h3 { font-size: 19px; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 15px; }

/* Feature grid */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px;
  transition: .25s; position: relative; overflow: hidden;
}
.feature::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 3px; background: linear-gradient(90deg, var(--blue-400), var(--cyan)); transform: scaleX(0); transform-origin: left; transition: .3s; }
.feature:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.feature:hover::before { transform: scaleX(1); }
.feature .ic { width: 50px; height: 50px; border-radius: 13px; background: var(--blue-50); color: var(--blue-600); display: grid; place-items: center; margin-bottom: 16px; }
.feature h3 { font-size: 18px; margin-bottom: 8px; }
.feature p { color: var(--muted); font-size: 15px; }

/* Platform showcase */
.platform-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.platform-text h2 { font-size: clamp(26px, 3.4vw, 38px); margin: 16px 0 14px; }
.platform-text p { color: var(--muted); font-size: 17px; }
.platform-text ul { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 14px; }
.platform-text li { display: flex; gap: 12px; align-items: flex-start; font-size: 15.5px; color: #36456a; }
.platform-text li .lic { flex: 0 0 auto; width: 34px; height: 34px; border-radius: 10px; background: var(--blue-50); color: var(--blue-600); display: grid; place-items: center; margin-top: 2px; }
.platform-visual { position: relative; }
.platform-visual .frame { border-radius: 22px; overflow: hidden; border: 1px solid var(--blue-100); box-shadow: var(--shadow); background: #fff; }
.platform-visual .mini { position: absolute; right: -10px; bottom: 24px; background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 12px 16px; box-shadow: var(--shadow); display: flex; align-items: center; gap: 10px; }
.platform-visual .mini img { width: 42px; height: 42px; border-radius: 10px; }
.platform-visual .mini b { font-size: 14px; color: var(--ink); }
.platform-visual .mini span { font-size: 12px; color: var(--muted); display: block; }

/* Solutions */
.solutions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.solution {
  background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.12); border-radius: var(--radius);
  padding: 30px; transition: .25s;
}
.solution:hover { background: rgba(255,255,255,.08); transform: translateY(-6px); }
.solution .ic { width: 52px; height: 52px; border-radius: 14px; background: rgba(34,211,238,.14); color: var(--cyan); display: grid; place-items: center; margin-bottom: 18px; }
.solution h3 { font-size: 20px; margin-bottom: 10px; color: #fff; }
.solution p { color: #a9bfe6; font-size: 15px; }
.solution ul { list-style: none; padding: 0; margin: 16px 0 0; }
.solution li { color: #c9d8f2; font-size: 14px; padding: 6px 0 6px 22px; position: relative; }
.solution li::before { content: ""; position: absolute; left: 0; top: 14px; width: 8px; height: 8px; border-radius: 50%; background: var(--cyan); }

/* Pricing */
.pricing { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.plan {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 32px 28px;
  display: flex; flex-direction: column; transition: .25s; position: relative;
}
.plan:hover { box-shadow: var(--shadow); transform: translateY(-6px); }
.plan--feature { border-color: var(--blue-400); box-shadow: var(--shadow-blue); }
.plan--feature::after { content: "热门"; position: absolute; top: 20px; right: 22px; background: linear-gradient(135deg, var(--blue-400), var(--blue-600)); color: #fff; font-size: 12px; font-weight: 700; padding: 4px 12px; border-radius: 999px; }
.plan h3 { font-size: 20px; }
.plan .desc { color: var(--muted); font-size: 14px; margin-top: 6px; min-height: 40px; }
.plan .price { margin: 18px 0 6px; display: flex; align-items: baseline; gap: 6px; }
.plan .price .cur { font-size: 22px; font-weight: 700; color: var(--blue-700); }
.plan .price .amt { font-size: 44px; font-weight: 800; color: var(--blue-700); letter-spacing: -.02em; }
.plan .price .per { color: var(--muted); font-size: 14px; }
.plan .price .contact { font-size: 30px; font-weight: 800; color: var(--blue-700); }
.plan ul { list-style: none; padding: 0; margin: 18px 0 26px; flex: 1; }
.plan li { font-size: 14.5px; color: #45556f; padding: 9px 0 9px 28px; position: relative; border-top: 1px dashed var(--line); }
.plan li:first-child { border-top: 0; }
.plan li::before { content: ""; position: absolute; left: 0; top: 15px; width: 18px; height: 18px; border-radius: 50%; background: var(--blue-50) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%232563eb' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E") center/12px no-repeat; }
.plan .btn { width: 100%; }

/* Cases */
.cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.case {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px;
  box-shadow: var(--shadow-sm); transition: .25s; display: flex; flex-direction: column;
}
.case:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.case .tag { align-self: flex-start; font-size: 12px; font-weight: 600; color: var(--blue-600); background: var(--blue-50); border: 1px solid var(--blue-100); padding: 4px 12px; border-radius: 999px; }
.case h3 { font-size: 18px; margin: 16px 0 10px; }
.case p { color: var(--muted); font-size: 14.5px; flex: 1; }
.case .more { margin-top: 16px; color: var(--blue-600); font-weight: 600; font-size: 14px; display: inline-flex; align-items: center; gap: 6px; }

/* FAQ */
.faq { max-width: 860px; margin: 0 auto; }
.faq-item {
  background: #fff; border: 1px solid var(--line); border-radius: 14px; margin-bottom: 14px;
  box-shadow: var(--shadow-sm); overflow: hidden;
}
.faq-item summary {
  list-style: none; cursor: pointer; padding: 20px 24px; font-weight: 600; font-size: 16.5px;
  display: flex; justify-content: space-between; align-items: center; gap: 16px; color: var(--ink);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 22px; font-weight: 400; color: var(--blue-500); line-height: 1; transition: transform .25s; }
.faq-item[open] summary { border-bottom: 1px solid var(--line); }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-a { padding: 18px 24px 22px; color: var(--muted); font-size: 15.5px; }

/* Contact */
.contact-card {
  display: grid; grid-template-columns: 1.35fr .65fr; gap: 40px; align-items: center;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 44px; max-width: 980px; margin: 0 auto;
}
.contact-info { display: grid; gap: 22px; }
.ci-item { display: flex; gap: 16px; align-items: flex-start; }
.ci-ic { flex: 0 0 auto; width: 46px; height: 46px; border-radius: 12px; background: var(--blue-50); color: var(--blue-600); display: grid; place-items: center; }
.ci-label { display: block; font-size: 13px; color: var(--muted); letter-spacing: .03em; margin-bottom: 2px; }
.ci-item b, .ci-item a { font-size: 16.5px; color: var(--ink); font-weight: 600; line-height: 1.5; }
.ci-item a { transition: .2s; }
.ci-item a:hover { color: var(--blue-600); }
.contact-qr {
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center;
  gap: 12px; padding: 26px 22px; border-radius: 16px; background: var(--bg-soft); border: 1px solid var(--blue-100);
}
.contact-qr img { width: 128px; height: 128px; border-radius: 12px; background: #fff; padding: 8px; box-shadow: var(--shadow-sm); }
.contact-qr b { font-size: 15px; color: var(--ink); }
.contact-qr span { font-size: 13px; color: var(--muted); max-width: 180px; }
@media (max-width: 760px) {
  .contact-card { grid-template-columns: 1fr; padding: 28px; gap: 26px; }
  .contact-qr { flex-direction: row; text-align: left; justify-content: flex-start; }
  .contact-qr span { max-width: none; }
}

/* CTA */
.cta-band {
  border-radius: 26px; padding: 56px; text-align: center; position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-700));
  color: #fff; box-shadow: var(--shadow-blue);
}
.cta-band::before { content: ""; position: absolute; inset: 0; background: radial-gradient(500px 300px at 80% 20%, rgba(34,211,238,.35), transparent 60%); }
.cta-band > * { position: relative; z-index: 1; }
.cta-band h2 { font-size: clamp(26px, 3.4vw, 38px); }
.cta-band p { color: #d6e2ff; margin: 14px auto 28px; max-width: 560px; font-size: 17px; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.cta-actions .btn--ghost { background: #fff; color: var(--blue-600); border-color: #fff; }
.cooperation { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 40px; text-align: left; }
.coop { background: rgba(255,255,255,.10); border: 1px solid rgba(255,255,255,.2); border-radius: var(--radius-sm); padding: 20px 22px; }
.coop h4 { color: #fff; font-size: 16px; margin-bottom: 6px; }
.coop p { color: #cfe0ff; font-size: 14px; }

/* Footer */
.footer { background: #08122a; color: #9fb3d6; padding: 64px 0 28px; }
.footer .grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 36px; }
.footer .brand { color: #fff; margin-bottom: 14px; }
.footer .about { font-size: 14px; max-width: 320px; line-height: 1.8; }
.footer h4 { color: #fff; font-size: 15px; margin: 4px 0 16px; }
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin-bottom: 10px; font-size: 14px; }
.footer a:hover { color: #fff; }
.footer .bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 40px; padding-top: 22px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 13px; }
.footer .socials { display: flex; gap: 12px; }
.footer .socials a { width: 36px; height: 36px; border-radius: 10px; border: 1px solid rgba(255,255,255,.14); display: grid; place-items: center; color: #cfe0ff; transition: .2s; }
.footer .socials a:hover { background: rgba(255,255,255,.1); color: #fff; }

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(24px); transition: .7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }

/* Responsive */
@media (max-width: 980px) {
  .nav-links { gap: 16px; }
  .nav-links a { font-size: 14px; }
  .nav-cta .btn--ghost { display: none; }
  .hero .container { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 520px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .steps, .features, .solutions, .cases { grid-template-columns: repeat(2, 1fr); }
  .platform-grid { grid-template-columns: 1fr; }
  .platform-visual { max-width: 520px; }
  .pricing { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }
  .footer .grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .section { padding: 70px 0; }
  .nav-links, .nav-cta .btn--ghost { display: none; }
  .menu-toggle { display: block; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute; top: 70px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line); padding: 18px 24px; gap: 16px; box-shadow: var(--shadow-sm);
  }
  .stats, .steps, .features, .solutions, .cases, .cooperation { grid-template-columns: 1fr; }
  .cta-band { padding: 40px 24px; }
  .footer .grid { grid-template-columns: 1fr; }
}