/* ============================================================
   虎迅客 · Layout
   容器、区块、栅格、页头导航、页脚、进度条、返回顶部、移动端 CTA
   高端商务化升级 · 玻璃态导航 · 层级氛围
   ============================================================ */

.container { width: calc(100% - 2rem); max-width: var(--max); margin: 0 auto; }
.container--narrow { max-width: var(--max-narrow); }

.section { padding: var(--space-9) 0; position: relative; }
.section--tight { padding: var(--space-7) 0; }
.section__head { max-width: 720px; margin-bottom: var(--space-7); }
.section__head--center { margin-left: auto; margin-right: auto; text-align: center; }
.section__head--center .eyebrow { justify-content: center; }
.section__title { margin-bottom: var(--space-3); }
.section__subtitle { font-size: 1.05rem; color: var(--text); margin: 0; }

/* 区块间全宽渐变分隔条 —— 解决深色背景下层次感不足 */
.section + .section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0; right: 0;
  height: 1px;
  background: var(--grad-hairline);
  pointer-events: none;
  opacity: 0.9;
}
/* 带背景图的 section 分隔条加深 */
.section + .section-bg::before,
.section-bg + .section::before {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(124,92,255,0.5) 28%, rgba(201,169,97,0.34) 50%, rgba(34,211,238,0.42) 72%, transparent);
}
/* section-bg 之间不靠 ::before，改用背景色阶差异 */
.section-bg + .section-bg {
  border-top: 1px solid var(--hairline);
}

/* 分隔条中心的光晕点缀 —— 让区块衔接更"精密" */
.section + .section::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 220px;
  height: 2px;
  background: radial-gradient(ellipse at center, rgba(124,92,255,0.75), transparent 72%);
  pointer-events: none;
}

/* 内容层级：位于氛围光之上 */
main { position: relative; z-index: 1; }

/* ---------- 栅格 ---------- */
.grid { display: grid; gap: var(--space-5); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--auto-sm { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-8); align-items: center; }
.split--wide-left { grid-template-columns: 1.15fr 0.85fr; }

/* ---------- 页头（深色玻璃态 + 极光扫线） ----------
   性能：.site-header 为 position:fixed，滚动时每一帧都要重采样模糊整屏，是典型掉帧源。
   模糊半径由 var(--blur-lg)=26px 降到 12px 且去掉 saturate()（改用略深的底色补偿通透感）；
   ≤900px 与低配模式下彻底去掉 backdrop-filter，改为接近不透明的纯色背景。 */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 100;
  display: flex; align-items: center;
  background: linear-gradient(180deg, rgba(7, 10, 22, 0.80) 0%, rgba(7, 10, 22, 0.56) 100%);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), height var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
/* 顶部金线：高端商务的点睛细节 */
.site-header::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(201,169,97,0.45) 30%, rgba(124,92,255,0.5) 50%, rgba(34,211,238,0.4) 70%, transparent);
  opacity: 0.7;
  pointer-events: none;
}
.site-header.scrolled {
  border-bottom-color: var(--border);
  background: rgba(7, 10, 22, 0.86);
  height: calc(var(--header-h) - 4px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}
/* ≤900px：彻底去掉 fixed 头部的 backdrop-filter，改为接近不透明的纯色背景
   （触屏/中低端设备的 GPU 模糊代价更高，去掉后观感几乎无差）。 */
@media (max-width: 900px) {
  .site-header {
    background: rgba(7, 10, 22, 0.94);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  .site-header.scrolled { background: rgba(7, 10, 22, 0.96); }
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: var(--space-5); }
.brand { display: flex; align-items: center; gap: var(--space-3); transition: opacity var(--dur) var(--ease); position: relative; }
.brand img { height: 44px; width: auto; transition: transform var(--dur) var(--ease); }
.brand:hover img { transform: scale(1.04); }
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__name { font-size: 1.15rem; font-weight: 700; color: var(--ink); letter-spacing: 0.02em; }
.brand__sub { font-size: 9px; letter-spacing: 0.14em; color: var(--muted); text-transform: uppercase; }

.nav { display: flex; align-items: center; gap: var(--space-1); }
.nav__link {
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text);
  position: relative;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
/* 悬浮时的极光扫线 */
.nav__link::before {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 5px;
  height: 1px;
  background: var(--grad-aurora);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-slow) var(--ease-out);
  opacity: 0.9;
}
.nav__link:hover { color: var(--ink); background: var(--brand-soft); }
.nav__link:hover::before { transform: scaleX(1); }
.nav__link.active { color: var(--brand-text); background: var(--brand-soft); }
.nav__link.active::after {
  content: "";
  position: absolute;
  bottom: 2px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--aurora-2);
  box-shadow: 0 0 10px rgba(34,211,238,.85);
}
.nav__cta { margin-left: var(--space-3); display: flex; align-items: center; gap: var(--space-2); }

.nav__phone {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  background: var(--surface-glass-2);
  backdrop-filter: var(--blur-sm);
  border: 1px solid var(--border);
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: all .2s ease;
  white-space: nowrap;
}
.nav__phone svg { width: 16px; height: 16px; color: var(--accent); }
.nav__phone:hover {
  color: var(--ink);
  border-color: var(--accent);
  box-shadow: 0 0 12px rgba(56,189,248,.3);
}
.nav__phone:hover svg { color: var(--accent); }

.nav-toggle { display: none; width: 40px; height: 40px; border-radius: var(--radius-md); background: var(--surface-glass-2); backdrop-filter: var(--blur-sm); border: 1px solid var(--border); color: var(--ink); align-items: center; justify-content: center; }
.nav-toggle svg { width: 22px; height: 22px; }

/* ---------- 滚动进度条（极光渐变 + 光晕） ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0;
  background: var(--grad-aurora);
  background-size: 200% 100%;
  z-index: 200;
  transition: width 0.1s linear;
  box-shadow: 0 0 14px rgba(124,92,255,.75), 0 0 28px rgba(34,211,238,.35);
  border-radius: 0 2px 2px 0;
  animation: progressFlow 6s linear infinite;
}
@keyframes progressFlow {
  0% { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}

/* ---------- 返回顶部（极光描边 + 光效） ---------- */
.back-top {
  position: fixed;
  right: 24px; bottom: 90px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: rgba(22, 29, 58, 0.92);
  border: 1px solid var(--border-glow);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-brand);
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.back-top.show { opacity: 1; visibility: visible; transform: none; }
.back-top:hover { transform: translateY(-3px) scale(1.06); box-shadow: 0 14px 40px rgba(124,92,255,.6); }
.back-top svg { width: 20px; height: 20px; }

/* ---------- 移动端底部固定 CTA ---------- */
.mobile-cta { display: none; }

/* ---------- 页脚（极光收尾 + 金线） ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: var(--space-8);
  background: linear-gradient(180deg, rgba(16, 21, 43, 0.86) 0%, rgba(7, 10, 22, 0.97) 100%);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-top: 1px solid var(--border);
  padding: var(--space-8) 0 var(--space-5);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: var(--grad-hairline);
  opacity: 0.85;
}
/* 页脚上方的极光辉光 */
.site-footer::after {
  content: "";
  position: absolute;
  top: -160px; left: 50%;
  transform: translateX(-50%);
  width: 760px; height: 320px;
  background: radial-gradient(ellipse at center, rgba(124,92,255,0.16), transparent 70%);
  pointer-events: none;
  animation: footerGlow 12s ease-in-out infinite alternate;
}
@keyframes footerGlow {
  0% { opacity: 0.6; transform: translateX(-50%) scale(1); }
  100% { opacity: 1; transform: translateX(-50%) scale(1.15); }
}
.footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: var(--space-7); margin-bottom: var(--space-7); position: relative; }
.footer__brand img { height: 40px; margin-bottom: var(--space-4); width: auto; }
.footer__desc { font-size: var(--fs-sm); color: var(--muted); line-height: 1.7; max-width: 320px; }
.footer__col h4 { font-size: var(--fs-sm); font-weight: 600; color: var(--ink); margin-bottom: var(--space-4); letter-spacing: 0.02em; position: relative; padding-left: 12px; }
.footer__col h4::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 3px; height: 12px;
  border-radius: 2px;
  background: var(--grad-aurora);
}
.footer__col li { margin-bottom: var(--space-3); }
.footer__col a { font-size: var(--fs-sm); color: var(--muted); transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease); }
.footer__col a:hover { color: var(--brand-text); padding-left: 4px; }
.footer__contact li { display: flex; gap: var(--space-2); font-size: var(--fs-sm); color: var(--muted); align-items: flex-start; }
.footer__contact svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 3px; color: var(--brand-text); }
.footer__qr { display: flex; gap: var(--space-3); align-items: center; margin-top: var(--space-4); }
.footer__qr img { height: 96px; width: auto; border-radius: var(--radius-md); border: 1px solid var(--border); }
.footer__qr span { font-size: var(--fs-xs); color: var(--muted); }
.footer__bottom { border-top: 1px solid var(--border); padding-top: var(--space-5); display: flex; flex-wrap: wrap; gap: var(--space-3) var(--space-5); justify-content: space-between; align-items: center; font-size: var(--fs-xs); color: var(--muted); position: relative; }
.footer__beian { display: flex; flex-wrap: wrap; gap: var(--space-4); }
.footer__beian a { color: var(--muted); font-size: var(--fs-xs); }
.footer__beian a:hover { color: var(--brand-text); }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .split, .split--wide-left { grid-template-columns: 1fr; gap: var(--space-6); }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: var(--space-6); }

  .nav-toggle { display: flex; }
  .nav {
    position: fixed;
    top: var(--header-h); left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
    padding: var(--space-4);
    background: rgba(7,10,22,.97);
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease), visibility var(--dur) var(--ease);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }
  .nav.open { transform: none; opacity: 1; visibility: visible; }
  .nav__link { padding: 12px 16px; font-size: var(--fs-body); }
  .nav__link::before { display: none; }
  .nav__cta { margin: var(--space-3) 0 0; flex-direction: column; align-items: stretch; }
  .nav__cta .btn, .nav__cta .nav__phone { width: 100%; justify-content: center; }
}

@media (max-width: 768px) {
  :root { --fs-h1: 2.1rem; --fs-h2: 1.6rem; --fs-h3: 1.25rem; --space-9: 56px; --space-8: 44px; }
  .section { padding: var(--space-7) 0; }
  .section + .section::after { display: none; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .grid--auto-sm { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr; gap: var(--space-6); }
  .footer__bottom { flex-direction: column; align-items: flex-start; gap: var(--space-3); }

  /* 移动端底部固定 CTA 栏 */
  .mobile-cta {
    display: flex;
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 95;
    gap: var(--space-2);
    padding: 10px 12px calc(10px + env(safe-area-inset-bottom));
    background: rgba(7,10,22,.96);
    border-top: 1px solid var(--border);
  }
  .mobile-cta .btn { flex: 1; padding: 12px 10px; font-size: var(--fs-sm); }
  .back-top { bottom: 140px; right: 14px; width: 42px; height: 42px; }
  body { padding-bottom: 64px; }
}

@media (max-width: 400px) {
  .grid--auto-sm { grid-template-columns: 1fr; }
}