:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f7f9fc;
  --color-bg-dark: #0b1020;
  --color-text: #1a2238;
  --color-text-soft: #5a6378;
  --color-primary: #2b6cff;
  --color-primary-dark: #1f54cc;
  --color-accent: #6c5ce7;
  --color-border: #e6eaf2;
  --color-shadow: 0 12px 40px rgba(20, 35, 80, 0.08);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --max-w: 1200px;
  --transition: 0.25s ease;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

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

/* ---------- Navigation ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--color-border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.3px;
}
.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: 14px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
}
.nav-links a {
  color: var(--color-text-soft);
  font-size: 15px;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--color-primary); }
.nav-cta {
  background: var(--color-primary);
  color: #fff !important;
  padding: 9px 18px;
  border-radius: 999px;
  font-weight: 600;
  transition: transform var(--transition), background var(--transition);
}
.nav-cta:hover { background: var(--color-primary-dark); transform: translateY(-1px); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 96px 0 80px;
  overflow: hidden;
  background:
    radial-gradient(800px 400px at 80% -10%, rgba(108,92,231,0.18), transparent 60%),
    radial-gradient(600px 300px at 0% 0%, rgba(43,108,255,0.18), transparent 60%),
    linear-gradient(180deg, #f8fbff 0%, #ffffff 100%);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(43,108,255,0.08);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(34px, 4.6vw, 56px);
  line-height: 1.15;
  margin: 0 0 18px;
  letter-spacing: -0.5px;
}
.hero h1 .accent {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.lead {
  font-size: 18px;
  color: var(--color-text-soft);
  max-width: 560px;
  margin: 0 0 28px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform var(--transition), background var(--transition),
    border-color var(--transition), box-shadow var(--transition);
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 10px 24px rgba(43,108,255,0.28);
}
.btn-primary:hover { background: var(--color-primary-dark); transform: translateY(-2px); }
.btn-ghost {
  background: #fff;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }

.hero-visual {
  position: relative;
  height: 420px;
}
.hero-card {
  position: absolute;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--color-shadow);
  border: 1px solid var(--color-border);
  padding: 18px;
  width: 220px;
}
.hero-card .ic {
  width: 48px; height: 48px; border-radius: 12px;
  display:grid; place-items:center; color:#fff; font-weight:700;
  margin-bottom: 12px;
}
.hero-card h4 { margin: 0 0 4px; font-size: 16px; }
.hero-card span { color: var(--color-text-soft); font-size: 13px; }
.hc-1 { top: 10px;  left: 10px;  transform: rotate(-4deg); }
.hc-2 { top: 70px;  right: 10px; transform: rotate(3deg); }
.hc-3 { bottom: 30px; left: 60px; transform: rotate(-2deg); }
.hc-4 { bottom: 0;   right: 40px; transform: rotate(5deg); }

/* ---------- Sections ---------- */
section { padding: 88px 0; }
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}
.section-head .eyebrow { margin-bottom: 14px; }
.section-head h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  margin: 0 0 14px;
  letter-spacing: -0.3px;
}
.section-head p { color: var(--color-text-soft); font-size: 17px; margin: 0; }

/* ---------- Products grid ---------- */
.products {
  background: var(--color-bg-alt);
}
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.product-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
  position: relative;
  overflow: hidden;
}
.product-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(43,108,255,0.04), rgba(108,92,231,0.04));
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}
.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--color-shadow);
  border-color: rgba(43,108,255,0.4);
}
.product-card:hover::after { opacity: 1; }
.product-icon {
  width: 56px; height: 56px;
  border-radius: 16px;
  display: grid; place-items: center;
  color: #fff;
  font-size: 22px;
  font-weight: 700;
}
.product-card h3 { margin: 0; font-size: 20px; }
.product-card p { margin: 0; color: var(--color-text-soft); font-size: 14px; min-height: 60px; }
.product-card .more {
  margin-top: auto;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.product-card .more::after {
  content: "→";
  transition: transform var(--transition);
}
.product-card:hover .more::after { transform: translateX(4px); }

/* Product brand colors */
.bg-paike   { background: linear-gradient(135deg,#2b6cff,#5b8cff); }
.bg-paikepro{ background: linear-gradient(135deg,#6c5ce7,#9c88ff); }
.bg-yinji   { background: linear-gradient(135deg,#ff7a59,#ff5e87); }
.bg-yueli   { background: linear-gradient(135deg,#10b981,#06d6a0); }

/* ---------- Features ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.feature {
  padding: 28px;
  border-radius: var(--radius-md);
  background: #fff;
  border: 1px solid var(--color-border);
}
.feature .ic {
  width: 44px; height: 44px;
  border-radius: 12px;
  display: grid; place-items: center;
  background: rgba(43,108,255,0.1);
  color: var(--color-primary);
  margin-bottom: 14px;
  font-size: 20px;
}
.feature h4 { margin: 0 0 8px; font-size: 17px; }
.feature p { margin: 0; color: var(--color-text-soft); font-size: 14px; }

/* ---------- About ---------- */
.about { background: var(--color-bg-alt); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 24px;
}
.stat {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px;
}
.stat .num {
  font-size: 30px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat .lbl { color: var(--color-text-soft); font-size: 14px; }

/* ---------- CTA ---------- */
.cta {
  background: linear-gradient(135deg, #1f3a8a, #2b6cff 60%, #6c5ce7);
  color: #fff;
  text-align: center;
  border-radius: var(--radius-lg);
  padding: 60px 30px;
  margin: 0 24px 60px;
  max-width: var(--max-w);
}
.cta-wrap { max-width: var(--max-w); margin: 0 auto; }
.cta h2 { font-size: 32px; margin: 0 0 12px; }
.cta p { opacity: 0.85; margin: 0 0 24px; }
.cta .btn-primary {
  background: #fff;
  color: var(--color-primary);
  box-shadow: 0 10px 30px rgba(0,0,0,0.18);
}
.cta .btn-primary:hover { background: #f0f4ff; }

/* ---------- Footer ---------- */
.footer {
  background: var(--color-bg-dark);
  color: #c5cad6;
  padding: 60px 0 30px;
  font-size: 14px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer h5 { color: #fff; font-size: 14px; margin: 0 0 16px; letter-spacing: 0.5px; }
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.footer a { color: #c5cad6; transition: color var(--transition); }
.footer a:hover { color: #fff; }
.footer .brand { color: #fff; margin-bottom: 14px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 20px;
  text-align: center;
  color: #8b93a7;
}

/* ---------- Product Detail Page ---------- */
.product-hero {
  padding: 80px 0 60px;
  background: linear-gradient(180deg, #f8fbff 0%, #ffffff 100%);
}
.product-hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}
.product-hero h1 {
  font-size: clamp(32px, 4vw, 48px);
  margin: 14px 0 16px;
  letter-spacing: -0.4px;
}
.product-hero p.lead {
  font-size: 18px;
  color: var(--color-text-soft);
  margin: 0 0 28px;
}
.download-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}
.dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: 12px;
  background: #0b1020;
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  transition: transform var(--transition), background var(--transition);
}
.dl-btn:hover { transform: translateY(-2px); background: #1a2238; }
.dl-btn .dl-ic { font-size: 22px; }
.dl-btn small { display: block; font-size: 11px; font-weight: 400; opacity: 0.7; }
.dl-btn strong { display: block; font-size: 14px; }
.product-mock {
  width: 280px;
  height: 560px;
  border-radius: 42px;
  background: #1a2238;
  padding: 14px;
  margin: 0 auto;
  box-shadow: 0 30px 60px rgba(20,35,80,0.25);
  position: relative;
}
.product-mock::before {
  content:"";
  position:absolute;
  top: 14px; left:50%;
  transform: translateX(-50%);
  width: 100px; height: 22px;
  background:#0b1020; border-radius: 0 0 14px 14px;
}
.product-mock .screen {
  width: 100%; height: 100%;
  border-radius: 30px;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 700;
  font-size: 22px;
  text-align: center;
  padding: 40px 20px;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 26px;
}
.feature-item .ic {
  width: 44px; height:44px;
  border-radius: 12px;
  display:grid; place-items:center;
  background: rgba(43,108,255,0.1);
  color: var(--color-primary);
  margin-bottom: 12px;
  font-size: 20px;
}
.feature-item h4 { margin: 0 0 6px; font-size: 17px; }
.feature-item p { margin:0; color: var(--color-text-soft); font-size: 14px; }

.scenarios {
  background: var(--color-bg-alt);
}
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.scenario {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  gap: 18px;
}
.scenario .num {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  display: grid; place-items: center;
  font-weight: 700;
  flex-shrink: 0;
}
.scenario h4 { margin: 0 0 6px; font-size: 17px; }
.scenario p { margin: 0; color: var(--color-text-soft); font-size: 14px; }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-soft);
  font-size: 14px;
  margin-bottom: 16px;
  transition: color var(--transition);
}
.back-link:hover { color: var(--color-primary); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero { padding: 70px 0 50px; }
  .hero-grid, .about-grid, .product-hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-visual { height: 320px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid, .feature-list { grid-template-columns: 1fr; }
  .scenario-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links a:not(.nav-cta) { display: none; }
  section { padding: 64px 0; }
}
@media (max-width: 520px) {
  .product-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr; }
}