@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  --primary: #1A5CFF;
  --primary-dark: #0A2540;
  --accent: #00D4AA;
  --bg: #F7F9FC;
  --card: #FFFFFF;
  --text-main: #1A1A2E;
  --text-sub: #6B7A99;
  --brand-bt: #1A5CFF;
  --brand-sx: #8B5A2B;
  --brand-wq: #FF6B35;
  --brand-qt: #D4A574;
  --radius-card: 16px;
  --radius-btn: 10px;
  --shadow-card: 0 4px 24px rgba(26,92,255,0.08);
  --shadow-hover: 0 12px 40px rgba(26,92,255,0.16);
  --max-width: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ========== 导航栏 ========== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10, 37, 64, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: all 0.3s ease;
}
.navbar.scrolled {
  background: rgba(10, 37, 64, 0.98);
  box-shadow: 0 4px 24px rgba(0,0,0,0.15);
}
.navbar::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,212,170,0.5), transparent);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 80px; }
.nav-logo {
  font-size: 24px; font-weight: 900; color: #fff;
  letter-spacing: 2px; display: flex; align-items: center; gap: 12px;
}
.nav-logo .logo-mark {
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 900; color: #fff;
  box-shadow: 0 4px 16px rgba(0,212,170,0.35);
  flex-shrink: 0;
}
.nav-menu { display: flex; gap: 40px; align-items: center; }
.nav-menu a {
  color: rgba(255,255,255,0.88);
  font-size: 16px; font-weight: 600; letter-spacing: 0.5px;
  padding: 8px 0; transition: color 0.25s; position: relative;
}
.nav-menu a:hover { color: #fff; }
.nav-menu a::after {
  content: ''; position: absolute; bottom: -2px; left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--accent), #4D9AFF);
  border-radius: 3px;
  transition: transform 0.3s ease;
  box-shadow: 0 0 12px rgba(0,212,170,0.8);
}
.nav-menu a:hover::after,
.nav-menu a.active::after { transform: translateX(-50%) scaleX(1); }
.nav-actions { display: flex; gap: 14px; align-items: center; }
.btn-ghost {
  padding: 11px 24px; border-radius: var(--radius-btn);
  border: 1.5px solid rgba(0,212,170,0.5);
  color: #fff; font-size: 14px; font-weight: 600;
  transition: all 0.25s; cursor: pointer; background: transparent;
}
.btn-ghost:hover {
  border-color: var(--accent);
  background: rgba(0,212,170,0.12);
  box-shadow: 0 0 20px rgba(0,212,170,0.3);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: transparent;
  border: none;
}
.nav-toggle span {
  width: 26px; height: 2.5px; background: #fff;
  border-radius: 2px; transition: 0.3s;
}

/* ========== 手机端抽屉（PC 完全隐藏） ========== */
.mobile-drawer {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 9999;
}
.mobile-drawer.open {
  display: block;
}
.mobile-drawer-mask {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
}
.mobile-drawer-panel {
  position: absolute; top: 0; right: 0;
  width: 82%; max-width: 320px;
  height: 100%;
  background: #0A2540;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex; flex-direction: column;
  box-shadow: -8px 0 40px rgba(0,0,0,0.4);
}
.mobile-drawer.open .mobile-drawer-panel {
  transform: translateX(0);
}
.mobile-drawer-head {
  padding: 20px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  display: flex; align-items: center; justify-content: space-between;
}
.mobile-drawer-close {
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(255,255,255,0.08);
  border: none; color: #fff; font-size: 18px;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
}
.mobile-drawer-menu {
  flex: 1;
  padding: 16px 0;
  overflow-y: auto;
}
.mobile-drawer-menu li a {
  display: block;
  padding: 16px 28px;
  color: rgba(255,255,255,0.85);
  font-size: 16px; font-weight: 600;
  transition: all 0.25s;
  border-left: 3px solid transparent;
}
.mobile-drawer-menu li a:hover,
.mobile-drawer-menu li a.active {
  background: rgba(0,212,170,0.08);
  color: #00D4AA;
  border-left-color: #00D4AA;
}
.mobile-drawer-foot {
  padding: 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
}

/* ========== 通用按钮 ========== */
.btn-primary {
  padding: 15px 36px; border-radius: var(--radius-btn);
  background: linear-gradient(135deg, var(--accent), #00B894);
  color: #0A2540; font-size: 16px; font-weight: 700;
  border: none; cursor: pointer; transition: all 0.3s;
  box-shadow: 0 8px 28px rgba(0,212,170,0.35);
  display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 14px 36px rgba(0,212,170,0.5); }
.btn-outline {
  padding: 15px 36px; border-radius: var(--radius-btn);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff; font-size: 16px; font-weight: 500;
  cursor: pointer; transition: all 0.3s;
  display: inline-flex; align-items: center; gap: 8px;
}
.btn-outline:hover { background: rgba(255,255,255,0.12); border-color: #fff; transform: translateY(-3px); }

/* ========== 区块标题 ========== */
.section { padding: 96px 0; }
.section-head { text-align: center; margin-bottom: 56px; }
.section-head .en {
  font-family: "Inter", sans-serif;
  font-size: 13px; font-weight: 600; color: var(--accent);
  letter-spacing: 4px; text-transform: uppercase; margin-bottom: 12px;
}
.section-head h2 {
  font-size: 38px; font-weight: 800; color: var(--text-main);
  letter-spacing: -0.5px; margin-bottom: 16px;
}
.section-head p { font-size: 16px; color: var(--text-sub); max-width: 640px; margin: 0 auto; }

/* ========== 页脚 ========== */
.footer { background: #061A2E; color: rgba(255,255,255,0.6); padding: 64px 0 0; }
.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr 1fr;
  gap: 40px; padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand .nav-logo { color: #fff; margin-bottom: 18px; font-size: 22px; }
.footer-brand .nav-logo .logo-mark { width: 36px; height: 36px; font-size: 18px; }
.footer-brand p { font-size: 13px; line-height: 1.9; color: rgba(255,255,255,0.5); max-width: 280px; }
.footer-col h4 { color: #fff; font-size: 15px; font-weight: 600; margin-bottom: 20px; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul a { font-size: 13px; color: rgba(255,255,255,0.55); transition: color 0.25s; }
.footer-col ul a:hover { color: var(--accent); }
.footer-bottom {
  padding: 24px 0;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px; color: rgba(255,255,255,0.4); flex-wrap: wrap; gap: 12px;
}

/* ========== 滚动淡入 ========== */
.reveal { opacity: 0; transform: translateY(36px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.active { opacity: 1; transform: translateY(0); }