/* ============================================================
   东交智控 - Common Components
   Header / Footer / Navigation / Shared UI
   ============================================================ */

/* === Breadcrumb Navigation === */
.breadcrumb-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
}

.breadcrumb-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-link:hover {
  color: var(--c-primary);
}

.breadcrumb-sep {
  color: var(--text-muted);
  margin: 0 2px;
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 500;
}

/* === Header === */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  background: transparent;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition-base);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: var(--border-default);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--container-max);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--fs-xl);
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
  transition: color var(--transition-base);
}

.site-header.scrolled .logo {
  color: var(--text-primary);
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--c-gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  box-shadow: var(--shadow-glow);
  flex-shrink: 0;
}

.logo-text {
  font-size: var(--fs-lg);
  line-height: 1.2;
}

.logo-text small {
  display: block;
  font-size: var(--fs-xs);
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* Nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.site-header.scrolled .nav-link {
  color: var(--text-secondary);
}

.nav-link:hover,
.nav-link.active {
  color: var(--c-primary);
  background: var(--c-accent-light);
}

.site-header.scrolled .nav-link:hover,
.site-header.scrolled .nav-link.active {
  color: var(--c-primary);
  background: var(--c-accent-light);
}

.nav-link .nav-arrow {
  font-size: 10px;
  transition: transform var(--transition-fast);
}

.nav-item:hover .nav-arrow {
  transform: rotate(180deg);
}

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-lg);
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-link {
  display: block;
  padding: 10px 14px;
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.dropdown-link:hover {
  color: var(--c-primary);
  background: var(--c-accent-light);
}

.dropdown-link strong {
  display: block;
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: 2px;
}

/* Header CTA */
.header-cta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.search-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.85);
  transition: all var(--transition-fast);
}

.site-header.scrolled .search-toggle {
  color: var(--text-secondary);
}

.search-toggle:hover {
  color: var(--c-primary);
  background: var(--c-accent-light);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  width: 36px;
  height: 36px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
}

.menu-toggle span {
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition-base);
}

.site-header.scrolled .menu-toggle span {
  background: var(--text-primary);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* === Search Overlay === */
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  z-index: 2000;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 120px;
}

.search-overlay.active {
  display: flex;
}

.search-box {
  width: 100%;
  max-width: 640px;
  padding: 0 var(--space-xl);
}

.search-input-wrap {
  position: relative;
  margin-bottom: var(--space-lg);
}

.search-input {
  width: 100%;
  padding: 16px 20px 16px 52px;
  font-size: var(--fs-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition-fast);
}

.search-input:focus {
  border-color: var(--c-primary);
  box-shadow: var(--shadow-glow);
}

.search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.search-results {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  max-height: 400px;
  overflow-y: auto;
}

.search-result-item {
  display: block;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-fast);
}

.search-result-item:hover {
  background: var(--bg-card-hover);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.search-result-desc {
  font-size: var(--fs-sm);
  color: var(--text-muted);
}

.search-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 24px;
  cursor: pointer;
}

.search-close:hover {
  color: var(--c-primary);
  background: var(--c-accent-light);
}

/* === Mobile Nav === */
.mobile-nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: #fff;
  z-index: 999;
  overflow-y: auto;
  padding: var(--space-xl);
  display: none;
}

.mobile-nav.active {
  display: block;
}

.mobile-nav-item {
  border-bottom: 1px solid var(--border-subtle);
}

.mobile-nav-link {
  display: block;
  padding: 14px 0;
  font-size: var(--fs-lg);
  font-weight: 500;
  color: var(--text-primary);
}

.mobile-nav-sub {
  padding-left: var(--space-lg);
  display: none;
}

.mobile-nav-item.expanded .mobile-nav-sub {
  display: block;
}

.mobile-nav-sub-link {
  display: block;
  padding: 10px 0;
  font-size: var(--fs-base);
  color: var(--text-secondary);
}

/* === Footer === */
.site-footer {
  background: var(--bg-darkest);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--space-4xl) 0 var(--space-xl);
  color: rgba(255, 255, 255, 0.7);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}

.footer-brand .logo {
  margin-bottom: var(--space-md);
  color: #fff;
}

.footer-desc {
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.7;
  max-width: 320px;
}

.footer-col h4 {
  font-size: var(--fs-base);
  font-weight: 600;
  color: #fff;
  margin-bottom: var(--space-md);
}

.footer-col ul li {
  margin-bottom: var(--space-sm);
}

.footer-col ul li a {
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
  color: var(--c-secondary);
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: var(--space-sm);
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.5);
}

.footer-contact-item svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--c-secondary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.4);
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.4);
}

.footer-bottom a:hover {
  color: var(--c-secondary);
}

/* === Breadcrumb === */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: calc(var(--header-height) + var(--space-xl)) 0 var(--space-lg);
  font-size: var(--fs-sm);
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--c-primary);
}

.breadcrumb-separator {
  color: var(--text-muted);
}

.breadcrumb-current {
  color: var(--c-primary);
}

/* === Page Hero === */
.page-hero {
  padding: calc(var(--header-height) + var(--space-3xl)) 0 var(--space-3xl);
  position: relative;
  overflow: hidden;
}

.page-hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
}

.page-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
}

.page-hero-bg::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(180deg, rgba(15,23,42,0.85) 0%, rgba(15,23,42,0.5) 50%, rgba(15,23,42,0.85) 100%);
}

.page-hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.page-hero h1 {
  font-size: var(--fs-5xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.page-hero p {
  font-size: var(--fs-xl);
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

/* White text only when page-hero has a background image with dark overlay */
.page-hero:has(.page-hero-bg) h1 {
  color: #fff;
}

.page-hero:has(.page-hero-bg) p {
  color: rgba(255, 255, 255, 0.85);
}

/* === FAQ === */
.faq-item {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  overflow: hidden;
  background: var(--bg-card);
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--border-default);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  font-size: var(--fs-lg);
  font-weight: 600;
  cursor: pointer;
  user-select: none;
}

.faq-toggle {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--c-accent-light);
  color: var(--c-primary);
  font-size: 20px;
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer-inner {
  padding: 0 var(--space-xl) var(--space-lg);
  color: var(--text-secondary);
  line-height: 1.8;
}

/* === CTA Section === */
.cta-section {
  padding: var(--space-4xl) 0;
  position: relative;
  overflow: hidden;
}

.cta-inner {
  text-align: center;
  position: relative;
  z-index: 1;
}

.cta-inner h2 {
  font-size: var(--fs-4xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: #fff;
}

.cta-inner p {
  font-size: var(--fs-lg);
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--space-xl);
}

.cta-buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

.cta-section .btn-outline {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
  backdrop-filter: blur(10px);
}

.cta-section .btn-outline:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: #fff;
  color: #fff;
}

/* === Floating Contact Widget === */
.float-contact {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.float-btn {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
}

.float-btn:hover {
  color: var(--c-primary);
  border-color: var(--c-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* === Back to Top === */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 80px;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 900;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  color: var(--c-primary);
  border-color: var(--c-primary);
}

/* === Tag Cloud === */
.tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: var(--fs-xs);
  border-radius: var(--radius-sm);
  background: var(--c-accent-light);
  border: 1px solid rgba(26, 86, 219, 0.15);
  color: var(--c-primary);
  margin: 2px;
  font-weight: 500;
}

/* === Feature List === */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
}

.feature-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: var(--radius-md);
  background: var(--c-accent-light);
  border: 1px solid rgba(26, 86, 219, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-primary);
  font-size: 20px;
}

.feature-content h4 {
  font-size: var(--fs-base);
  font-weight: 600;
  margin-bottom: 4px;
}

.feature-content p {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
}

/* === Stat Counter === */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: var(--fs-5xl);
  font-weight: 800;
  background: var(--c-gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 4px;
}

.stat-label {
  font-size: var(--fs-sm);
  color: var(--text-muted);
}

/* === Image Gallery === */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.gallery-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-base);
}

.gallery-item:hover {
  border-color: var(--border-glow);
  transform: translateY(-2px);
}

.gallery-item img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-caption {
  padding: var(--space-md);
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  background: var(--bg-card);
}

/* === Tabs === */
.tabs {
  display: flex;
  gap: var(--space-xs);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: var(--space-xl);
  overflow-x: auto;
}

.tab-btn {
  padding: 12px 20px;
  font-size: var(--fs-base);
  font-weight: 500;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  color: var(--c-primary);
  border-bottom-color: var(--c-primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* === Form === */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-error {
  color: #ff4d6d;
  font-size: var(--fs-xs);
  margin-top: 4px;
  display: none;
}

.form-error.show {
  display: block;
}

.form-success {
  display: none;
  padding: var(--space-lg);
  background: var(--c-accent-light);
  border: 1px solid rgba(26, 86, 219, 0.3);
  border-radius: var(--radius-md);
  text-align: center;
  color: var(--c-primary);
}

.form-success.show {
  display: block;
}