/* 路利达汽车电子官网 — 全局样式 */
:root {
  --color-primary: #0A1628;      /* 深空蓝 */
  --color-primary-light: #132238;
  --color-accent: #E53935;       /* 路利达红 */
  --color-accent-dark: #C62828;
  --color-tech: #2563EB;         /* 科技蓝 */
  --color-text: #1F2937;
  --color-text-muted: #6B7280;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F5F7FA;
  --color-border: #E5E7EB;
  --radius: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(10, 22, 40, 0.05);
  --shadow: 0 10px 30px rgba(10, 22, 40, 0.08);
  --shadow-lg: 0 20px 50px rgba(10, 22, 40, 0.12);
  --max-width: 1200px;
  --header-height: 72px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-dark {
  background: var(--color-primary);
  color: #fff;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 56px;
}

.section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.section-dark .section-title {
  color: #fff;
}

.section-desc {
  font-size: 18px;
  color: var(--color-text-muted);
}

.section-dark .section-desc {
  color: rgba(255,255,255,0.7);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.25s ease;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.4);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: #fff;
}

.btn-dark {
  background: var(--color-primary);
  color: #fff;
}

.btn-dark:hover {
  background: var(--color-primary-light);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 22px;
  color: var(--color-primary);
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  position: relative;
}

.nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.25s ease;
}

.nav a:hover::after,
.nav a.active::after {
  width: 100%;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
}

.lang-switch button {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 8px;
  color: var(--color-text-muted);
  font-weight: 600;
}

.lang-switch button.active {
  color: var(--color-accent);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  transition: all 0.3s ease;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  background: var(--color-primary);
  color: #fff;
  overflow: hidden;
  padding-top: var(--header-height);
}

.hero-bg {
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-size: cover;
  background-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(10,22,40,0.92) 0%, rgba(10,22,40,0.75) 60%, rgba(10,22,40,0.4) 100%);
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  max-width: 620px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
}

.hero-title {
  font-size: 52px;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
}

.hero-title .highlight {
  color: var(--color-accent);
}

.hero-desc {
  font-size: 20px;
  color: rgba(255,255,255,0.75);
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
}

.hero-visual img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255,255,255,0.1);
}

.hero-stats {
  position: absolute;
  bottom: -24px;
  left: -24px;
  background: #fff;
  color: var(--color-text);
  padding: 20px 24px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  display: flex;
  gap: 32px;
}

.hero-stat strong {
  display: block;
  font-size: 28px;
  font-weight: 800;
  color: var(--color-primary);
}

.hero-stat span {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  background: rgba(229,57,53,0.08);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-primary);
}

.card p {
  font-size: 15px;
  color: var(--color-text-muted);
}

/* Products */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
}

.product-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.product-image {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-bg-alt);
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.product-card:hover .product-image img {
  transform: scale(1.05);
}

.product-body {
  padding: 24px;
}

.product-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-tech);
  background: rgba(37,99,235,0.08);
  padding: 4px 10px;
  border-radius: 50px;
  margin-bottom: 10px;
}

.product-body h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-primary);
}

.product-body p {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.product-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.product-meta span {
  font-size: 12px;
  padding: 4px 10px;
  background: var(--color-bg-alt);
  border-radius: 4px;
  color: var(--color-text-muted);
}

/* Brands */
.brands-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-top: 32px;
}

.brand-item {
  padding: 12px 24px;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  font-weight: 600;
  font-size: 15px;
  color: var(--color-text);
}

/* Split Section */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.split img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.split-content h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--color-primary);
}

.split-content p {
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.feature-list {
  margin-top: 24px;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
  color: var(--color-text);
}

.feature-list li::before {
  content: '';
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  background: var(--color-accent);
  border-radius: 50%;
  margin-top: 2px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
  background-size: 12px;
  background-position: center;
  background-repeat: no-repeat;
}

/* Timeline */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding-left: 24px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-left: 40px;
  padding-bottom: 36px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -24px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--color-border);
}

.timeline-year {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.timeline-item h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.timeline-item p {
  color: var(--color-text-muted);
  font-size: 15px;
}

/* News */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.news-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.news-image {
  height: 200px;
  background: var(--color-bg-alt);
  overflow: hidden;
}

.news-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.news-body {
  padding: 24px;
}

.news-date {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.news-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
  line-height: 1.4;
}

.news-body p {
  font-size: 14px;
  color: var(--color-text-muted);
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
}

.contact-info h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--color-primary);
}

.contact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.contact-item-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  background: rgba(229,57,53,0.08);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-item h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}

.contact-item p {
  font-size: 15px;
  color: var(--color-text-muted);
}

.contact-form {
  background: #fff;
  padding: 40px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 15px;
  font-family: inherit;
  transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-tech);
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* Footer */
.footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .logo {
  color: #fff;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  max-width: 280px;
}

.footer-col h4 {
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 20px;
}

.footer-col li {
  margin-bottom: 12px;
}

.footer-col a {
  font-size: 14px;
  transition: color 0.2s ease;
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}

/* Responsive */
@media (max-width: 992px) {
  .hero-inner,
  .split,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 40px;
  }

  .hero-stats {
    position: static;
    margin-top: 32px;
    justify-content: center;
  }

  .split img {
    order: -1;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100dvh - var(--header-height));
    background: #fff;
    flex-direction: column;
    align-items: flex-start;
    padding: 32px 24px;
    gap: 24px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }

  .nav.open {
    transform: translateX(0);
  }

  .mobile-menu-btn {
    display: flex;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 28px;
  }

  .hero-title {
    font-size: 34px;
  }

  .hero-desc {
    font-size: 17px;
  }

  .card-grid,
  .product-grid,
  .news-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

/* Carousel Hero */
.hero-carousel {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  background: var(--color-primary);
  color: #fff;
  overflow: hidden;
  padding-top: var(--header-height);
}

.carousel-track {
  position: absolute;
  inset: 0;
  display: flex;
  transition: transform 0.7s ease-in-out;
}

.carousel-slide {
  position: relative;
  min-width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
}

.carousel-slide-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.45;
}

.carousel-slide-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(10,22,40,0.92) 0%, rgba(10,22,40,0.75) 55%, rgba(10,22,40,0.35) 100%);
}

.carousel-content {
  position: relative;
  z-index: 2;
  width: 100%;
}

.carousel-controls {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 16px;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.35);
  border: none;
  cursor: pointer;
  transition: all 0.25s ease;
  padding: 0;
}

.carousel-dot.active {
  background: var(--color-accent);
  width: 28px;
  border-radius: 5px;
}

.carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.2);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.25s ease;
}

.carousel-arrow:hover {
  background: rgba(255,255,255,0.25);
}

.carousel-arrow.prev { left: 24px; }
.carousel-arrow.next { right: 24px; }

@media (max-width: 768px) {
  .carousel-arrow { display: none; }
  .carousel-controls { bottom: 24px; }
}

/* Customer Cases */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.case-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.case-logo {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  background: var(--color-bg-alt);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 20px;
  margin-bottom: 20px;
}

.case-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.case-card p {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  line-height: 1.7;
}

.case-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.case-meta span {
  font-size: 12px;
  padding: 4px 10px;
  background: rgba(229,57,53,0.08);
  border-radius: 4px;
  color: var(--color-accent);
  font-weight: 600;
}

/* Form message */
.form-message {
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  font-size: 14px;
  display: none;
}

.form-message.success {
  display: block;
  background: rgba(22,163,74,0.1);
  color: #166534;
  border: 1px solid rgba(22,163,74,0.2);
}

.form-message.error {
  display: block;
  background: rgba(229,57,53,0.1);
  color: #991b1b;
  border: 1px solid rgba(229,57,53,0.2);
}

/* ICP Beian */
.icp-beian {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.55);
  font-size: 13px;
}

.icp-beian a {
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  transition: color 0.2s ease;
}

.icp-beian a:hover {
  color: #fff;
}

.icp-beian-placeholder {
  color: rgba(255,255,255,0.45);
  font-style: italic;
}

.footer-icp {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 16px;
  margin-top: 16px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

/* 公安联网备案（公安备案数据码） */
.ga-beian {
  display: inline-flex;
  align-items: center;
  color: rgba(255,255,255,0.55);
  font-size: 13px;
}

.ga-beian a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  transition: color 0.2s ease;
}

.ga-beian a:hover {
  color: #fff;
}

/* Utility */
.text-center { text-align: center; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.hidden { display: none; }