/* ============================================
   子站专属样式 — 与主站不同布局
   响应式：768(tablet) → 640(large phone) → 480(phone) → 360(small)
   ============================================ */

/* 子站顶部栏 */
.sub-top-bar {
  background: #f97316;
  color: #fff;
  padding: 4px 0;
  font-size: .82rem;
}
.sub-top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.sub-city-label { font-weight: 600; }
.sub-city-switch {
  display: flex;
  align-items: center;
  gap: 12px;
}
.sub-city-select {
  background: rgba(255,255,255,.2);
  color: #fff;
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: .8rem;
}
.sub-city-select option { color: #333; }
.sub-back-main {
  color: rgba(255,255,255,.85);
  font-size: .78rem;
}
.sub-back-main:hover { color: #fff; }

/* 子站Header */
.subsite-header {
  background: #fff;
  border-bottom: 2px solid #f97316;
  padding: 10px 0;
  position: relative;
}
.subsite-header .container {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.sub-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}
.sub-logo-icon { font-size: 1.6rem; }
.sub-logo-brand {
  font-size: 1.15rem;
  font-weight: 700;
  color: #1e293b;
}
.sub-logo-city {
  display: block;
  font-size: .75rem;
  color: #f97316;
  font-weight: 600;
}

.sub-slogan {
  font-size: .8rem;
  color: #f97316;
  font-weight: 600;
  animation: slogan-jump 0.6s ease-in-out infinite alternate;
  margin: 0 8px;
  white-space: nowrap;
}

.sub-phone-btn {
  background: #f97316;
  color: #fff;
  padding: 8px 16px;
  border-radius: 20px;
  font-weight: 700;
  font-size: .9rem;
  text-decoration: none;
  margin-left: auto;
  animation: btn-sweep 2.5s ease-in-out infinite;
  background-size: 200% 100%;
  background-image: linear-gradient(90deg, #f97316 0%, #f97316 35%, rgba(255,255,255,.25) 50%, #f97316 65%, #f97316 100%);
  white-space: nowrap;
}
.sub-phone-btn:hover { transform: scale(1.05); color: #fff; }

/* 子站导航 */
.subsite-nav {
  display: flex;
  gap: 4px;
}
.subsite-nav a {
  padding: 6px 14px;
  color: #475569;
  font-weight: 500;
  font-size: .92rem;
  border-radius: 6px;
  text-decoration: none;
}
.subsite-nav a:hover,
.subsite-nav a.active {
  color: #f97316;
  background: #fff7ed;
}

/* Nav dropdown — align toggle with other nav links */
.subsite-nav .nav-dropdown {
  display: flex;
  align-items: center;
}
.subsite-nav .nav-dropdown-toggle {
  display: block;
}

/* Nav toggle — hidden on desktop */
.nav-toggle { display: none; }

/* 城市Hero */
.city-hero {
  position: relative;
  background: linear-gradient(135deg, #f97316 0%, #ea580c 50%, #c2410c 100%);
  padding: 60px 0;
  overflow: hidden;
}
.city-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60'%3E%3Ccircle cx='30' cy='30' r='1' fill='rgba(255,255,255,0.1)'/%3E%3C/svg%3E");
  opacity: .5;
}
.city-hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: #fff;
}
.city-badge {
  display: inline-block;
  background: rgba(255,255,255,.2);
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 20px;
  padding: 4px 16px;
  font-size: .85rem;
  margin-bottom: 16px;
}
.city-hero-content h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: #fff;
}
.city-hero-desc {
  font-size: 1rem;
  opacity: .9;
  max-width: 560px;
  margin: 0 auto 24px;
  line-height: 1.7;
}
.city-hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.btn-call-big {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #fff;
  color: #f97316;
  padding: 16px 32px;
  border-radius: 16px;
  font-weight: 700;
  text-decoration: none;
  transition: transform .2s;
  box-shadow: 0 4px 20px rgba(0,0,0,.15);
}
.btn-call-big:hover { transform: translateY(-2px); }
.call-icon { font-size: 1.5rem; }
.call-num { font-size: 1.3rem; }
.call-label { font-size: .75rem; opacity: .7; }

.btn-chat-big {
  background: rgba(255,255,255,.2);
  color: #fff;
  padding: 16px 32px;
  border-radius: 16px;
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  border: 1px solid rgba(255,255,255,.3);
  transition: transform .2s, background .2s;
  display: flex; align-items: center; justify-content: center; gap: 6px;
  animation: chat-pulse 2s ease-in-out infinite;
}
.btn-chat-big:hover { transform: translateY(-2px); background: rgba(255,255,255,.3); }
@keyframes chat-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255,255,255,.4); }
  50% { box-shadow: 0 0 0 10px rgba(255,255,255,0); }
}

.city-hero-trust {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
  font-size: .88rem;
  opacity: .9;
}

/* 快捷服务 */
.city-quick-services {
  margin-top: -30px;
  position: relative;
  z-index: 2;
}
.quick-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.quick-card {
  background: #fff;
  border-radius: 16px;
  padding: 24px 16px;
  text-align: center;
  text-decoration: none;
  box-shadow: 0 2px 12px rgba(0,0,0,.08);
  transition: transform .2s;
}
.quick-card:hover { transform: translateY(-3px); }
.quick-icon { font-size: 2rem; display: block; margin-bottom: 8px; }
.quick-label { font-size: 1rem; font-weight: 700; color: #1e293b; display: block; }
.quick-desc { font-size: .8rem; color: #94a3b8; }
.quick-card-call { border-top: 3px solid #f97316; }
.quick-card-qa { border-top: 3px solid #22c55e; }
.quick-card-fix { border-top: 3px solid #3b82f6; }
.quick-card-pipe { border-top: 3px solid #8b5cf6; }

/* Nav toggle — hidden on desktop, shown on mobile */
.nav-toggle { display: none; }

/* Footer */
.subsite-footer {
  background: #1e293b;
  color: #cbd5e1;
  padding: 16px 0 8px;
  margin-top: 0;
}
.subsite-footer h4 {
  color: #fff;
  font-size: .95rem;
  margin-bottom: 10px;
  font-weight: 600;
}
.subsite-footer a {
  color: #94a3b8;
  text-decoration: none;
  font-size: .85rem;
  line-height: 1.8;
  transition: color .2s;
}
.subsite-footer a:hover { color: #f97316; }
.subsite-footer p {
  font-size: .85rem;
  line-height: 1.7;
  color: #94a3b8;
  margin-bottom: 6px;
}
.sub-footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.sub-footer-brand p { margin-bottom: 4px; }
.sub-footer-tel {
  font-size: .95rem !important;
  color: #f97316 !important;
  font-weight: 600;
  margin-top: 6px !important;
}
.sub-footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.sub-footer-col li { margin: 0; }
.sub-footer-bottom {
  text-align: center;
  padding: 8px 0 0;
  font-size: .78rem;
  color: #64748b;
}
.sub-footer-bottom p { margin: 0; color: #64748b; }

/* === About Page === */
.about-page {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 16px;
}
.about-hero {
  text-align: center;
  padding: 48px 20px 40px;
  margin-bottom: 36px;
  background: linear-gradient(160deg, #0f172a 0%, #1e293b 60%, #f97316 100%);
  border-radius: 16px;
  color: #fff;
}
.about-hero h1 { font-size: 2rem; font-weight: 800; margin-bottom: 8px; color: #fff; }
.about-hero p { font-size: 1.05rem; color: rgba(255,255,255,.75); margin: 0; }

.about-section { margin-bottom: 40px; }
.about-section h2 { font-size: 1.35rem; font-weight: 700; color: #1e293b; margin-bottom: 16px; padding-bottom: 8px; border-bottom: 2px solid #f97316; display: inline-block; }
.about-section p { font-size: .98rem; line-height: 1.8; color: #475569; margin-bottom: 12px; }

.promise-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 8px;
}
.promise-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 24px 16px;
  text-align: center;
  transition: box-shadow .2s;
}
.promise-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,.08); }
.promise-icon { font-size: 2rem; display: block; margin-bottom: 10px; }
.promise-card h3 { font-size: 1rem; font-weight: 600; color: #1e293b; margin-bottom: 6px; }
.promise-card p { font-size: .85rem; color: #64748b; line-height: 1.6; margin: 0; }

.contact-info {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 24px;
}
.contact-info p { font-size: .95rem; color: #334155; margin-bottom: 10px; }
.contact-info p:last-child { margin-bottom: 0; }
.contact-info strong { color: #1e293b; }

/* ============================================
   MOBILE RESPONSIVE SYSTEM
   ============================================ */

/* ══ TABLET 768px ══ */
@media (max-width: 768px) {
  /* Top bar */
  .sub-top-bar { font-size: .75rem; padding: 6px 0; }
  .sub-top-inner { gap: 4px; }
  .sub-city-switch { gap: 8px; font-size: .75rem; }
  .sub-back-main { font-size: .72rem; }

  /* Header */
  .subsite-header .container { gap: 8px; }
  .sub-logo-icon { font-size: 1.3rem; }
  .sub-logo-brand { font-size: 1rem; }
  .sub-logo-city { font-size: .7rem; }
  .sub-slogan { display: none; }

  /* Nav — hamburger */
  .nav-toggle {
    display: block;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #1e293b;
    padding: 6px;
    cursor: pointer;
  }
  .subsite-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: #fff;
    box-shadow: 0 8px 24px rgba(0,0,0,.12);
    flex-direction: column;
    padding: 8px;
    z-index: 100;
  }
  .subsite-nav.open { display: flex; }
  .subsite-nav a {
    padding: 12px 16px;
    border-radius: 8px;
    font-size: .95rem;
  }

  /* Phone button */
  .sub-phone-btn { padding: 6px 12px; font-size: .8rem; margin-left: 0; }

  /* City Hero */
  .city-hero { padding: 40px 0 36px; }
  .city-hero-content h1 { font-size: 1.6rem; }
  .city-hero-desc { font-size: .9rem; max-width: 100%; padding: 0 8px; }
  .city-hero-cta { flex-direction: column; align-items: center; gap: 12px; }
  .btn-call-big { padding: 12px 24px; width: 100%; max-width: 260px; }
  .btn-chat-big { padding: 12px 24px; width: 100%; max-width: 260px; text-align: center; }
  .call-num { font-size: 1.1rem; }
  .city-hero-trust { gap: 10px; font-size: .78rem; }
  .city-badge { font-size: .78rem; padding: 4px 12px; }

  /* Quick grid */
  .quick-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .quick-card { padding: 18px 12px; }
  .quick-icon { font-size: 1.5rem; margin-bottom: 6px; }
  .quick-label { font-size: .9rem; }
  .quick-desc { font-size: .72rem; }
  .city-quick-services { margin-top: -20px; }

  /* City services */
  .city-services { padding: 32px 0; }
  .city-knowledge { padding: 32px 0; }
  .testimonials { padding: 32px 0; }

  /* About */
  .about-hero { padding: 36px 16px 32px; }
  .about-hero h1 { font-size: 1.5rem; }
  .promise-grid { grid-template-columns: repeat(2, 1fr); }

  /* Footer — 768px */
  .subsite-footer { padding: 14px 0 8px; margin-top: 0; }
  .sub-footer-grid { grid-template-columns: 1fr 1fr; gap: 12px 10px; }
}

/* ══ LARGE PHONE 640px ══ */
@media (max-width: 640px) {
  .sub-top-inner { flex-direction: column; align-items: flex-start; }
  .subsite-header { padding: 8px 0; }
  .subsite-header .container { gap: 6px; }
  .sub-phone-btn { font-size: .75rem; padding: 5px 10px; }

  .city-hero { padding: 32px 0 28px; }
  .city-hero-content h1 { font-size: 1.35rem; }
  .city-hero-desc { font-size: .82rem; }

  .quick-grid { gap: 10px; }
  .quick-card { padding: 14px 10px; }
  .quick-icon { font-size: 1.3rem; }
  .quick-label { font-size: .82rem; }
  .quick-desc { font-size: .68rem; }
  .city-quick-services { margin-top: -16px; }

  /* About */
  .about-hero { padding: 28px 14px 24px; border-radius: 12px; }
  .about-hero h1 { font-size: 1.3rem; }
  .about-hero p { font-size: .85rem; }
  .about-section h2 { font-size: 1.15rem; }
  .about-section p { font-size: .9rem; }

  /* Footer — 640px */
  .sub-footer-grid { grid-template-columns: 1fr; gap: 10px; }
  .subsite-footer { padding: 12px 0 6px; margin-top: 0; }
}

/* ══ PHONE 480px ══ */
@media (max-width: 480px) {
  .sub-top-bar { font-size: .7rem; padding: 4px 0; }
  .sub-city-switch { gap: 4px; flex-wrap: wrap; }
  .sub-city-select { font-size: .7rem; padding: 2px 6px; }

  .sub-logo-icon { font-size: 1.1rem; }
  .sub-logo-brand { font-size: .9rem; }
  .sub-logo-city { font-size: .65rem; }
  .sub-phone-btn { font-size: .7rem; padding: 4px 8px; border-radius: 16px; }

  .city-hero { padding: 28px 0 24px; }
  .city-hero-content h1 { font-size: 1.2rem; }
  .city-hero-desc { font-size: .78rem; margin-bottom: 14px; }
  .city-badge { font-size: .7rem; padding: 3px 10px; margin-bottom: 10px; }
  .btn-call-big { padding: 10px 18px; border-radius: 12px; max-width: 220px; }
  .btn-chat-big { padding: 10px 18px; font-size: .9rem; border-radius: 12px; max-width: 220px; }
  .call-icon { font-size: 1.2rem; }
  .call-num { font-size: 1rem; }
  .call-label { font-size: .7rem; }
  .city-hero-trust { gap: 6px; font-size: .7rem; }

  .quick-grid { gap: 8px; }
  .quick-card { padding: 12px 8px; border-radius: 12px; }
  .quick-icon { font-size: 1.1rem; margin-bottom: 4px; }
  .quick-label { font-size: .75rem; }
  .quick-desc { display: none; }
  .city-quick-services { margin-top: -14px; }

  .city-services { padding: 24px 0; }
  .city-knowledge { padding: 24px 0; }
  .testimonials { padding: 24px 0; }

  /* About */
  .about-hero { padding: 24px 12px 20px; border-radius: 10px; margin-bottom: 24px; }
  .about-hero h1 { font-size: 1.15rem; }
  .about-hero p { font-size: .8rem; }
  .about-section { margin-bottom: 28px; }
  .about-section h2 { font-size: 1.05rem; }
  .about-section p { font-size: .85rem; }
  .promise-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .promise-card { padding: 16px 12px; }
  .promise-icon { font-size: 1.5rem; }
  .promise-card h3 { font-size: .9rem; }
  .promise-card p { font-size: .78rem; }
  .contact-info { padding: 16px; }

  /* Footer — 480px */
  .subsite-footer { padding: 12px 0 6px; margin-top: 0; font-size: .78rem; }
  .subsite-footer h4 { font-size: .85rem; margin-bottom: 10px; }
  .subsite-footer a { font-size: .78rem; line-height: 1.8; }
}

/* ══ SMALL PHONE 360px ══ */
@media (max-width: 360px) {
  .sub-top-inner { flex-direction: column; align-items: flex-start; }
  .sub-back-main { display: none; }

  .subsite-header .container { gap: 4px; }
  .sub-logo-icon { font-size: 1rem; }
  .sub-logo-brand { font-size: .8rem; }
  .sub-logo-city { display: none; }
  .nav-toggle { font-size: 1.3rem; padding: 4px; }

  .city-hero { padding: 24px 0 20px; }
  .city-hero-content h1 { font-size: 1.1rem; }
  .city-hero-desc { font-size: .72rem; }
  .btn-call-big { padding: 8px 14px; max-width: 100%; }
  .btn-chat-big { padding: 8px 14px; font-size: .85rem; max-width: 100%; }
  .call-num { font-size: .9rem; }
  .city-hero-trust { gap: 4px; font-size: .65rem; flex-direction: column; align-items: center; }

  .quick-grid { grid-template-columns: 1fr; gap: 6px; }
  .quick-card { padding: 10px; border-radius: 10px; }
  .quick-icon { font-size: 1rem; }
  .quick-label { font-size: .72rem; }
  .city-quick-services { margin-top: -12px; }

  /* About */
  .about-hero { padding: 20px 10px 16px; border-radius: 8px; }
  .about-hero h1 { font-size: 1.05rem; }
  .about-hero p { font-size: .75rem; }
  .about-section h2 { font-size: 1rem; }
  .about-section p { font-size: .82rem; }
  .promise-grid { grid-template-columns: 1fr; gap: 8px; }
  .promise-card { padding: 14px 10px; }
  .promise-icon { font-size: 1.3rem; }
  .promise-card h3 { font-size: .85rem; }
  .promise-card p { font-size: .75rem; }
  .contact-info { padding: 14px; font-size: .85rem; }

  /* Footer — 360px */
  .subsite-footer { padding: 10px 0 4px; margin-top: 0; }
  .sub-footer-grid { gap: 8px; }
  .subsite-footer a { font-size: .75rem; line-height: 1.7; }
  .sub-footer-bottom { font-size: .7rem; padding-top: 12px; }
}