:root {
  --primary: #1A1A2E;
  --primary-dark: #0F0F1A;
  --primary-light: #2D2D4A;
  --secondary: #E94560;
  --accent: #F5A623;
}

/* 企业官网 · 专业商务风 */
html { scroll-behavior: smooth; }
body { -webkit-font-smoothing: antialiased; }

::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: #f1f5f9; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: #1d4ed8; }
::selection { background: #1d4ed8; color: #fff; }

/* 卡片 */
.biz-card { transition: transform .3s ease, box-shadow .3s ease; }
.biz-card:hover { transform: translateY(-4px); box-shadow: 0 16px 38px -14px rgba(15,23,42,.22); }

/* 图片缩放 */
.zoom-img { overflow: hidden; }
.zoom-img img { transition: transform .55s cubic-bezier(.16,.84,.44,1); }
.zoom-img:hover img { transform: scale(1.06); }

/* 时间线 */
.timeline-item { position: relative; padding-left: 2rem; }
.timeline-item::before {
  content: ""; position: absolute; left: 5px; top: 6px;
  width: 11px; height: 11px; border-radius: 50%;
  background: #1d4ed8; box-shadow: 0 0 0 4px rgba(29,78,216,.15);
}
.timeline-line { position: absolute; left: 10px; top: 6px; bottom: 0; width: 1px; background: #cbd5e1; }

/* 移动端抽屉导航 */
.nav { transition: transform .4s cubic-bezier(.16,.84,.44,1); }
@media (max-width: 1023px) {
  .nav {
    position: fixed; top: 0; right: 0; bottom: 0;
    width: 84%; max-width: 340px;
    flex-direction: column; align-items: flex-start;
    justify-content: flex-start;
    background: #fff; padding: 5.5rem 1.5rem 2rem;
    transform: translateX(100%);
    z-index: 60; overflow-y: auto; gap: .35rem;
    display: flex !important;
    box-shadow: -10px 0 40px rgba(0,0,0,.1);
  }
  .nav.active { transform: translateX(0); }
  .nav a { width: 100%; }
  .menu-overlay {
    position: fixed; inset: 0;
    background: rgba(15,23,42,.45);
    opacity: 0; visibility: hidden;
    transition: opacity .35s ease; z-index: 55;
  }
  .menu-overlay.active { opacity: 1; visibility: visible; }
  body.menu-open { overflow: hidden; }
}

/* FAQ 折叠 */
.faq-answer {
  max-height: 0; overflow: hidden; opacity: 0;
  transition: max-height .4s ease, opacity .4s ease;
}
.faq-icon { transition: transform .35s ease; }

/* 回到顶部 */
.back-to-top { opacity: 0; visibility: hidden; transition: opacity .35s ease; }
.back-to-top.visible { opacity: 1; visibility: visible; }

/* 入场动画 */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp .75s ease both; }

@media print {
  header, footer, .nav, .no-print { display: none !important; }
}