:root {
  --blue: #1f6feb;
  --blue-dark: #1857c4;
  --ink: #0f1b2d;
  --slate: #5b6b82;
  --line: #e4e9f0;
  --bg: #ffffff;
  --bg-alt: #f5f8fc;
  --max: 1080px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

/* nav */
.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
  background: rgba(255,255,255,0.86);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; letter-spacing: .02em; }
.nav-links { display: flex; gap: 26px; font-size: 15px; color: var(--slate); }
.nav-links a:hover { color: var(--blue); }

/* hero */
.hero {
  padding: 96px 0 84px;
  background:
    radial-gradient(1200px 400px at 80% -10%, rgba(31,111,235,0.10), transparent 60%),
    linear-gradient(180deg, #fbfdff, #ffffff);
  border-bottom: 1px solid var(--line);
}
.eyebrow { color: var(--blue); font-weight: 600; letter-spacing: .14em; font-size: 13px; text-transform: uppercase; }
.hero h1 { font-size: clamp(30px, 5vw, 50px); line-height: 1.18; margin: 14px 0 18px; letter-spacing: -0.01em; }
.lead { font-size: 18px; color: var(--slate); max-width: 680px; }
.hero-cta { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }

.btn { display: inline-block; padding: 12px 24px; border-radius: 10px; font-weight: 600; font-size: 15px; transition: transform .12s ease, background .15s ease; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-dark); }
.btn-ghost { border: 1px solid var(--line); color: var(--ink); background: #fff; }
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }

/* sections */
.section { padding: 78px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section h2 { font-size: clamp(24px, 3.4vw, 34px); margin-bottom: 14px; letter-spacing: -0.01em; }
.section-lead { color: var(--slate); font-size: 17px; max-width: 760px; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 36px; }
.stat { background: var(--bg-alt); border: 1px solid var(--line); border-radius: 14px; padding: 22px; }
.stat b { display: block; font-size: 20px; color: var(--blue); }
.stat span { color: var(--slate); font-size: 14px; }

.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 36px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 26px; transition: box-shadow .18s ease, transform .18s ease; }
.card:hover { box-shadow: 0 14px 36px -22px rgba(31,111,235,0.5); transform: translateY(-3px); }
.card h3 { font-size: 19px; margin-bottom: 8px; }
.card p { color: var(--slate); font-size: 15px; }

/* product */
.product { display: flex; gap: 28px; align-items: center; margin-top: 30px; flex-wrap: wrap;
  background: linear-gradient(135deg, #0f1b2d, #16335e); color: #fff; border-radius: 20px; padding: 36px; }
.product-mark { font-size: 40px; font-weight: 800; letter-spacing: .08em; line-height: 1; }
.product-mark span { display: block; font-size: 13px; letter-spacing: .4em; color: #8fb6ff; margin-top: 8px; font-weight: 600; }
.product-body h3 { font-size: 22px; margin-bottom: 8px; }
.product-body p { color: #c7d6ee; max-width: 560px; margin-bottom: 18px; }
.product .btn-primary { background: #fff; color: var(--ink); }
.product .btn-primary:hover { background: #e9f0fb; }

/* contact */
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 30px; }
.contact-item { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px; }
.contact-item b { display: block; color: var(--slate); font-size: 13px; font-weight: 600; margin-bottom: 4px; }
.contact-item span { font-size: 16px; }

/* footer */
.foot { background: #0f1b2d; color: #9fb0c8; padding: 26px 0; font-size: 14px; }
.foot-wrap { display: flex; gap: 20px; flex-wrap: wrap; align-items: center; justify-content: center; text-align: center; }
.foot a { color: #9fb0c8; }
.foot a:hover { color: #fff; }

@media (max-width: 720px) {
  .nav-links { display: none; }
  .stats, .cards, .contact-grid { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 56px; }
  .section { padding: 56px 0; }
}