:root {
  --bg: #f1f6ff;
  --ink: #10223f;
  --muted: #63718a;
  --blue: #2563eb;
  --cyan: #06b6d4;
  --violet: #7c3aed;
  --green: #10b981;
  --line: #d9e5f7;
  --card: rgba(255,255,255,.92);
  --shadow: 0 22px 0 #bed0f0, 0 38px 70px rgba(37,99,235,.18);
  --radius: 28px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 10%, rgba(37,99,235,.18), transparent 26rem),
    radial-gradient(circle at 88% 8%, rgba(6,182,212,.20), transparent 24rem),
    linear-gradient(180deg, #f8fbff 0%, var(--bg) 48%, #eaf2ff 100%);
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,.82); backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 900; }
.logo {
  width: 44px; height: 44px; border-radius: 16px; display: grid; place-items: center; color: white;
  background: linear-gradient(145deg, #6ee7ff, var(--blue) 55%, var(--violet));
  box-shadow: inset 0 -7px 0 rgba(0,0,0,.18), 0 12px 22px rgba(37,99,235,.26);
}
.links { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; color: var(--muted); font-size: 14px; }
.links a, .lang { padding: 10px 13px; border-radius: 999px; border: 1px solid transparent; }
.links a:hover, .links .active { color: var(--blue); background: white; border-color: var(--line); box-shadow: 0 8px 0 #d7e4f7; }
.lang { color: var(--blue); border-color: var(--line); background: white; }
.hero { padding: 90px 0 70px; overflow: hidden; }
.hero-grid, .split { display: grid; grid-template-columns: 1.04fr .96fr; gap: 46px; align-items: center; }
.eyebrow { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.eyebrow span, .tag {
  display: inline-flex; padding: 8px 12px; border-radius: 999px; color: var(--blue);
  background: white; border: 1px solid var(--line); font-size: 13px; font-weight: 900;
  box-shadow: 0 6px 0 #dbe8f9;
}
h1, h2, h3 { margin: 0; letter-spacing: -.04em; }
h1 { font-size: clamp(44px, 7.4vw, 92px); line-height: .95; max-width: 940px; }
h2 { font-size: clamp(30px, 4vw, 52px); line-height: 1.06; margin: 14px 0; }
h3 { font-size: 20px; margin-bottom: 10px; }
p { color: var(--muted); line-height: 1.8; }
.lead { font-size: 18px; max-width: 720px; margin: 24px 0; }
.actions { display: flex; flex-wrap: wrap; gap: 16px; margin: 28px 0; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 50px;
  padding: 0 22px; border-radius: 16px; font-weight: 900; color: white;
  background: linear-gradient(145deg, #5ddcff, var(--blue));
  box-shadow: inset 0 -8px 0 rgba(0,0,0,.18), 0 14px 0 #1747b5, 0 28px 40px rgba(37,99,235,.22);
  transform: translateY(0);
}
.btn:hover { transform: translateY(4px); box-shadow: inset 0 -6px 0 rgba(0,0,0,.18), 0 10px 0 #1747b5, 0 22px 36px rgba(37,99,235,.18); }
.btn-soft { color: var(--blue); background: white; box-shadow: inset 0 -7px 0 #e2ebf8, 0 12px 0 #cbdcf4; }
.trust { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 30px; }
.trust div, .card, .step, .faq-item, .codebox, .visual-card {
  border: 1px solid var(--line); background: var(--card); border-radius: var(--radius);
  box-shadow: 0 12px 0 #d7e4f6, 0 28px 50px rgba(37,99,235,.11);
}
.trust div { padding: 16px; }
.trust b { display: block; color: var(--blue); font-size: 22px; }
.trust span { color: var(--muted); font-size: 13px; }
.device {
  position: relative; padding: 18px; border-radius: 38px; background: linear-gradient(145deg,#fff,#eaf3ff);
  border: 1px solid white; box-shadow: var(--shadow); transform: perspective(1100px) rotateY(-9deg) rotateX(4deg);
}
.device::before {
  content: "3D CLIENT"; position: absolute; right: 30px; top: 30px; z-index: 2;
  padding: 9px 12px; border-radius: 999px; background: white; color: var(--blue); font-weight: 900; font-size: 12px;
  box-shadow: 0 7px 0 #d7e4f6;
}
.device img { border-radius: 28px; aspect-ratio: 4 / 5; object-fit: cover; }
section { padding: 74px 0; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 28px; }
.section-head p { max-width: 560px; margin: 0; }
.grid { display: grid; gap: 18px; }
.platforms { grid-template-columns: repeat(5, 1fr); }
.cards, .compat, .reco-grid, .use-grid { grid-template-columns: repeat(3, 1fr); }
.steps { grid-template-columns: repeat(3, 1fr); counter-reset: step; }
.faq { grid-template-columns: repeat(2, 1fr); }
.card, .step, .faq-item { padding: 24px; }
.card:hover, .step:hover, .faq-item:hover { transform: translateY(4px); box-shadow: 0 8px 0 #d7e4f6, 0 22px 42px rgba(37,99,235,.1); }
.icon {
  width: 44px; height: 44px; display: grid; place-items: center; margin-bottom: 16px; border-radius: 16px;
  color: white; background: linear-gradient(145deg, var(--cyan), var(--blue));
  box-shadow: inset 0 -7px 0 rgba(0,0,0,.16), 0 9px 0 #bfd4f2;
}
.meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.meta span { color: var(--muted); font-size: 12px; border-radius: 999px; background: #eef5ff; padding: 7px 10px; }
.codebox { padding: 24px; font-family: Consolas, "Courier New", monospace; color: #1747b5; line-height: 1.9; }
.checklist { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 18px; }
.checklist span { border-radius: 16px; background: white; border: 1px solid var(--line); box-shadow: 0 6px 0 #d7e4f6; padding: 14px; color: var(--muted); }
.visual-card { overflow: hidden; padding: 16px; }
.visual-card img, .reco img { width: 100%; object-fit: cover; border-radius: 20px; }
.reco img { height: 190px; margin-bottom: 18px; }
.step::before {
  counter-increment: step; content: "STEP " counter(step); display: inline-flex;
  padding: 8px 12px; border-radius: 999px; color: white; background: var(--green); font-size: 12px; font-weight: 900;
  box-shadow: inset 0 -5px 0 rgba(0,0,0,.16), 0 7px 0 #bfe5d8; margin-bottom: 16px;
}
.cta-box {
  text-align: center; border-radius: 36px; padding: 48px; background: linear-gradient(145deg,#fff,#e7f1ff);
  border: 1px solid white; box-shadow: var(--shadow);
}
.footer { padding: 36px 0; border-top: 1px solid var(--line); color: var(--muted); }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(5, 1fr); gap: 18px; }
.footer b { display: block; color: var(--ink); margin-bottom: 10px; }
@media (max-width: 900px) {
  .nav { flex-direction: column; align-items: flex-start; padding: 16px 0; }
  .hero-grid, .split, .platforms, .cards, .compat, .reco-grid, .use-grid, .steps, .faq, .checklist, .footer-grid { grid-template-columns: 1fr; }
  .section-head { display: block; }
  .device { transform: none; }
}