:root {
  --bg: #0b1220;
  --bg-soft: #f6f8fc;
  --text: #1b2330;
  --muted: #5f6b7a;
  --brand: #ff411b;
  --brand-dark: #e33816;
  --card: #ffffff;
  --line: #e9edf4;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--text);
  background: #fff;
  scroll-behavior: smooth;
}

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

.container {
  width: min(1160px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.nav-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #ff6b4a, var(--brand));
  color: #fff;
  font-weight: 700;
}

.brand-cn {
  margin: 0;
  font-size: 14px;
  font-weight: 700;
}

.brand-en {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.nav {
  display: flex;
  gap: 20px;
}

.nav a {
  font-size: 14px;
  color: #2a3442;
}

.menu-btn {
  display: none;
  border: 0;
  background: transparent;
  font-size: 22px;
}

.mobile-menu {
  display: none;
}

.hero {
  background:
    radial-gradient(1200px 500px at 85% -50%, #ffd5cc 0%, transparent 60%),
    linear-gradient(180deg, #fff 0%, #fff6f3 100%);
  padding: 70px 0 56px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  align-items: center;
}

.tag {
  display: inline-block;
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 1.2px;
  color: var(--brand);
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.18;
}

.hero-desc {
  margin: 18px 0 0;
  color: #3f4a58;
  line-height: 1.8;
}

.hero-actions {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 42px;
  padding: 0 18px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
}

.btn-primary {
  background: linear-gradient(135deg, #ff6b4a, var(--brand));
  color: #fff;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #ff5a36, var(--brand-dark));
}

.btn-light {
  border: 1px solid #ffd5cc;
  background: #fff;
  color: var(--brand);
}

.hero-card {
  background: #121b2d;
  color: #e9edf5;
  padding: 24px;
  border-radius: 16px;
  box-shadow: 0 18px 34px rgba(19, 25, 42, 0.18);
}

.hero-card h3 {
  margin: 0 0 14px;
  font-size: 20px;
}

.hero-card ul {
  margin: 0;
  padding-left: 20px;
  line-height: 2;
  color: #ced7e7;
}

.section {
  padding: 74px 0;
}

.alt {
  background: var(--bg-soft);
}

.section-head {
  margin-bottom: 24px;
}

.section-tag {
  margin: 0;
  color: var(--brand);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.1px;
}

h2 {
  margin: 8px 0 0;
  font-size: clamp(24px, 4vw, 34px);
}

.product-grid,
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px;
}

.card h3 {
  margin: 0 0 10px;
}

.card p {
  margin: 0;
  line-height: 1.75;
  color: #485566;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feature {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
}

.feature h3 {
  margin: 0 0 8px;
}

.feature p {
  margin: 0;
  color: #4f5b6b;
  line-height: 1.7;
}

.timeline {
  display: grid;
  gap: 14px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
}

.timeline-item span {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  background: linear-gradient(135deg, #ff6b4a, var(--brand));
}

.timeline-item h4 {
  margin: 0;
}

.timeline-item p {
  margin: 8px 0 0;
  color: #526075;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 20px;
}

.about-grid p {
  color: #4a596d;
  line-height: 1.8;
}

.about-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px;
}

.about-card h3 {
  margin-top: 0;
}

.about-card p {
  margin: 10px 0;
}

.site-footer {
  background: var(--bg);
  color: #c9d3e3;
}

.footer-wrap {
  min-height: 88px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.footer-wrap p {
  margin: 0;
  font-size: 14px;
}

@media (max-width: 980px) {
  .hero-grid,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .product-grid,
  .feature-grid,
  .contact-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .nav {
    display: none;
  }

  .menu-btn {
    display: block;
  }

  .mobile-menu {
    display: none;
    border-top: 1px solid var(--line);
    background: #fff;
  }

  .mobile-menu.open {
    display: flex;
    flex-direction: column;
  }

  .mobile-menu a {
    padding: 14px 4%;
    border-bottom: 1px solid #f1f3f7;
    font-size: 14px;
  }

  .section {
    padding: 56px 0;
  }

  .product-grid,
  .feature-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
}