:root {
  --bg: #0a0f1f;
  --bg-alt: #0f1730;
  --surface: #131c38;
  --primary: #2f7bff;
  --primary-2: #38d1ff;
  --text: #e8edf7;
  --text-dim: #9aa7c4;
  --border: rgba(255, 255, 255, 0.08);
  --radius: 16px;
  --maxw: 1160px;
}

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

html { scroll-behavior: smooth; }

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

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

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

/* 顶部导航 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 15, 31, 0.6);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s;
}
.site-header.scrolled {
  background: rgba(10, 15, 31, 0.92);
  border-bottom-color: var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  min-width: 0;
}
.brand-logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
  border-radius: 10px;
  flex-shrink: 0;
}
.brand-text {
  font-size: 16px;
  letter-spacing: 0.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav { display: flex; gap: 30px; }
.nav a {
  color: var(--text-dim);
  font-size: 15px;
  transition: color 0.2s;
}
.nav a:hover { color: var(--text); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: 0.3s;
}

/* Hero */
.hero {
  position: relative;
  padding: 180px 0 120px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(600px circle at 15% 20%, rgba(47, 123, 255, 0.28), transparent 60%),
    radial-gradient(700px circle at 85% 30%, rgba(56, 209, 255, 0.18), transparent 60%),
    linear-gradient(180deg, var(--bg), var(--bg-alt));
  z-index: -1;
}
.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--primary-2);
  font-size: 14px;
  letter-spacing: 2px;
  margin-bottom: 24px;
}
.hero-title {
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.2;
  font-weight: 800;
  background: linear-gradient(120deg, #fff 30%, var(--primary-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 24px;
}
.hero-desc {
  max-width: 720px;
  color: var(--text-dim);
  font-size: 17px;
  margin-bottom: 36px;
}
.hero-desc strong { color: var(--text); }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 56px; }

.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff;
  box-shadow: 0 10px 30px rgba(47, 123, 255, 0.35);
}
.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.06); }
.btn-lg { padding: 16px 40px; font-size: 16px; }

.hero-stats {
  display: flex;
  gap: 48px;
  list-style: none;
  flex-wrap: wrap;
}
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats .num {
  font-size: 30px;
  font-weight: 800;
  background: linear-gradient(120deg, var(--primary-2), var(--primary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-stats .label { color: var(--text-dim); font-size: 14px; }

/* Sections */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { text-align: center; margin-bottom: 56px; }
.eyebrow {
  color: var(--primary-2);
  font-size: 13px;
  letter-spacing: 3px;
  text-transform: uppercase;
  font-weight: 600;
}
.section-head h2 {
  font-size: clamp(26px, 3.5vw, 38px);
  font-weight: 800;
  margin-top: 10px;
}
.section-sub {
  color: var(--text-dim);
  margin-top: 14px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}
.about-text p { color: var(--text-dim); font-size: 16px; margin-bottom: 20px; }
.about-text strong { color: var(--text); }
.about-highlights { display: grid; gap: 16px; }
.highlight-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
}
.highlight-card h3 { font-size: 18px; margin-bottom: 6px; }
.highlight-card p { color: var(--text-dim); font-size: 14px; }

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.biz-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 26px;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.biz-card:hover {
  transform: translateY(-6px);
  border-color: rgba(56, 209, 255, 0.4);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}
.biz-icon {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  font-size: 28px;
  border-radius: 14px;
  background: rgba(47, 123, 255, 0.14);
  margin-bottom: 18px;
}
.biz-card h3 { font-size: 19px; margin-bottom: 10px; }
.biz-card p { color: var(--text-dim); font-size: 14.5px; }

/* Platform */
.platform-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.platform-col {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
}
.platform-col h3 { font-size: 20px; margin-bottom: 22px; }
.tag-list { list-style: none; display: flex; flex-wrap: wrap; gap: 12px; }
.tag-list li {
  padding: 10px 20px;
  border-radius: 999px;
  background: rgba(47, 123, 255, 0.12);
  border: 1px solid var(--border);
  font-size: 15px;
}

/* Advantage */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.adv-item {
  padding: 28px 24px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
}
.adv-num {
  font-size: 30px;
  font-weight: 800;
  color: rgba(56, 209, 255, 0.5);
}
.adv-item h3 { font-size: 18px; margin: 12px 0 8px; }
.adv-item p { color: var(--text-dim); font-size: 14px; }

/* Contact */
.contact-card {
  background: linear-gradient(135deg, rgba(47, 123, 255, 0.18), rgba(56, 209, 255, 0.08));
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.contact-info h3 { font-size: 22px; margin-bottom: 14px; }
.contact-line { display: flex; align-items: center; gap: 14px; }
.contact-label {
  color: var(--text-dim);
  font-size: 14px;
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
}
.contact-phone {
  font-size: 26px;
  font-weight: 800;
  color: var(--primary-2);
  letter-spacing: 1px;
}

/* Footer */
.site-footer {
  background: #070b16;
  border-top: 1px solid var(--border);
  padding: 40px 0;
}
.footer-inner { text-align: center; }
.footer-logo {
  width: 64px;
  height: 64px;
  object-fit: contain;
  margin: 0 auto 16px;
  display: block;
  border-radius: 12px;
}
.footer-name { font-weight: 700; margin-bottom: 10px; }
.footer-copy, .footer-icp { color: var(--text-dim); font-size: 14px; margin-top: 6px; }
.footer-icp a:hover { color: var(--primary-2); }

/* Responsive */
@media (max-width: 900px) {
  .about-grid,
  .platform-wrap { grid-template-columns: 1fr; }
  .cards,
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .nav {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(10, 15, 31, 0.98);
    border-bottom: 1px solid var(--border);
    padding: 8px 24px 20px;
    transform: translateY(-120%);
    transition: transform 0.3s;
  }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 14px 0; border-bottom: 1px solid var(--border); }
  .nav-toggle { display: flex; }
  .brand-logo { width: 36px; height: 36px; }
  .brand-text { font-size: 14px; max-width: 60vw; }
  .hero { padding: 140px 0 90px; }
  .section { padding: 72px 0; }
  .cards,
  .adv-grid { grid-template-columns: 1fr; }
  .contact-card { padding: 32px 24px; text-align: center; justify-content: center; }
  .contact-line { justify-content: center; }
}