/* roulang page: index */
:root {
      --primary: #00A389;
      --primary-hover: #008872;
      --primary-glow: rgba(0, 163, 137, 0.35);
      --secondary: #0F172A;
      --secondary-card: #1E293B;
      --accent: #38BDF8;
      --accent-soft: rgba(56, 189, 248, 0.12);
      --bg-white: #FFFFFF;
      --bg-light: #F8FAFC;
      --bg-dark: #0B0F19;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --text-light: #F1F5F9;
      --border-color: #E2E8F0;
      --border-dark: #334155;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-pill: 9999px;
      --shadow-sm: 0 4px 12px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 30px -4px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 20px 40px -10px rgba(15, 23, 42, 0.15);
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-white);
      line-height: 1.75;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, input, select {
      font-family: inherit;
      outline: none;
      border: none;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部通栏导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }

    .top-bar {
      background: var(--secondary);
      color: #94A3B8;
      font-size: 0.8125rem;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .main-nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--secondary);
      letter-spacing: -0.5px;
    }

    .logo-badge {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #fff;
      font-size: 0.75rem;
      padding: 3px 8px;
      border-radius: var(--radius-sm);
      letter-spacing: 0.5px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 28px;
    }

    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: #475569;
      position: relative;
      padding: 8px 0;
    }

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

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: var(--transition);
    }

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

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-pill);
      cursor: pointer;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #059669 100%);
      color: #FFFFFF;
      box-shadow: 0 4px 14px var(--primary-glow);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #028f78 0%, #047857 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px var(--primary-glow);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--border-color);
      color: var(--text-main);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(0, 163, 137, 0.04);
    }

    .btn-white {
      background: #FFFFFF;
      color: var(--secondary);
    }

    .btn-white:hover {
      background: #F1F5F9;
      transform: translateY(-2px);
    }

    /* 板块通用头部 */
    .section-padding {
      padding: 96px 0;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 56px auto;
    }

    .section-badge {
      display: inline-block;
      padding: 6px 14px;
      background: var(--accent-soft);
      color: #0284C7;
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: var(--radius-pill);
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--secondary);
      line-height: 1.3;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 1. 首屏 Banner */
    .hero-banner {
      position: relative;
      background: linear-gradient(rgba(11, 15, 25, 0.75), rgba(11, 15, 25, 0.85)), url('/assets/images/5f302d6e8a54d225.webp') center/cover no-repeat;
      min-height: 86vh;
      display: flex;
      align-items: center;
      color: #FFFFFF;
      padding: 60px 0;
    }

    .hero-content {
      max-width: 780px;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(0, 163, 137, 0.25);
      border: 1px solid rgba(0, 163, 137, 0.4);
      padding: 6px 16px;
      border-radius: var(--radius-pill);
      color: #6EE7B7;
      font-size: 0.9rem;
      font-weight: 500;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 3.25rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-title span {
      background: linear-gradient(135deg, #38BDF8 0%, #34D399 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: #CBD5E1;
      margin-bottom: 36px;
      line-height: 1.8;
    }

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

    .countdown-bar {
      margin-top: 48px;
      padding: 16px 24px;
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.12);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      flex-wrap: wrap;
    }

    /* 2. 品牌核心定位与三电技术解构 */
    .tech-matrix {
      background: var(--bg-light);
    }

    .tech-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .tech-visual-card {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
    }

    .tech-visual-card img {
      width: 100%;
      height: 440px;
      transition: var(--transition);
    }

    .tech-visual-card:hover img {
      transform: scale(1.03);
    }

    .tech-specs-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .spec-item-box {
      background: #FFFFFF;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .spec-item-box:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }

    .spec-item-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .spec-item-title span {
      color: var(--primary);
      font-size: 0.9rem;
      font-weight: 600;
    }

    .spec-item-box p {
      color: var(--text-muted);
      font-size: 0.95rem;
      margin: 0;
    }

    /* 3. 核心优势矩阵 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .adv-card {
      background: #FFFFFF;
      padding: 36px 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .adv-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      border-color: var(--primary);
    }

    .adv-icon {
      width: 56px;
      height: 56px;
      background: rgba(0, 163, 137, 0.1);
      color: var(--primary);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: bold;
      margin-bottom: 20px;
    }

    .adv-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 12px;
    }

    .adv-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 4. 热门旗舰车型 */
    .models-section {
      background: var(--bg-light);
    }

    .models-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .model-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }

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

    .model-img-wrapper {
      height: 240px;
      position: relative;
      overflow: hidden;
    }

    .model-img-wrapper img {
      width: 100%;
      height: 100%;
      transition: var(--transition);
    }

    .model-card:hover .model-img-wrapper img {
      transform: scale(1.05);
    }

    .model-badge-float {
      position: absolute;
      top: 16px;
      left: 16px;
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(8px);
      color: #38BDF8;
      font-size: 0.8rem;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: var(--radius-pill);
    }

    .model-body {
      padding: 28px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    .model-title {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 6px;
    }

    .model-price {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .model-specs-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 16px 0;
      margin-bottom: 24px;
      text-align: center;
    }

    .model-spec-val {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--secondary);
    }

    .model-spec-lbl {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    .model-desc-text {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 24px;
      flex-grow: 1;
    }

    /* 5. 绿色出行愿景 (深色对比区) */
    .vision-section {
      background: radial-gradient(circle at 80% 20%, #1e293b 0%, #0b0f19 70%);
      color: #FFFFFF;
      position: relative;
      overflow: hidden;
    }

    .vision-layout {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 56px;
      align-items: center;
    }

    .vision-text h2 {
      font-size: 2.3rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 24px;
      color: #F8FAFC;
    }

    .vision-text p {
      font-size: 1.05rem;
      color: #94A3B8;
      line-height: 1.8;
      margin-bottom: 32px;
    }

    .vision-points {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .vision-point-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .vision-point-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: var(--primary);
      margin-top: 8px;
      flex-shrink: 0;
      box-shadow: 0 0 10px var(--primary);
    }

    .vision-point-text h4 {
      font-size: 1.1rem;
      font-weight: 600;
      color: #E2E8F0;
      margin-bottom: 4px;
    }

    .vision-point-text p {
      font-size: 0.9rem;
      color: #64748B;
      margin: 0;
    }

    .vision-card-box {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-dark);
      box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    }

    /* 6. 全场景出行图景 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .scenario-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .scenario-card img {
      height: 220px;
      width: 100%;
    }

    .scenario-content {
      padding: 28px;
    }

    .scenario-tag {
      font-size: 0.8rem;
      color: var(--primary);
      font-weight: 600;
      text-transform: uppercase;
      margin-bottom: 8px;
      display: block;
    }

    .scenario-title {
      font-size: 1.3rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 12px;
    }

    .scenario-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 7. 关键数据统计条 */
    .stats-strip {
      background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
      color: #FFFFFF;
      padding: 64px 0;
      border-top: 1px solid rgba(255,255,255,0.05);
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-item {
      padding: 12px;
    }

    .stat-num {
      font-size: 2.75rem;
      font-weight: 800;
      background: linear-gradient(135deg, #38BDF8 0%, #34D399 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 6px;
      font-family: inherit;
    }

    .stat-label {
      font-size: 1.05rem;
      font-weight: 600;
      color: #E2E8F0;
      margin-bottom: 4px;
    }

    .stat-sub {
      font-size: 0.8rem;
      color: #94A3B8;
    }

    /* 8. 车主真实故事与共创 */
    .stories-section {
      background: var(--bg-light);
    }

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

    .story-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .story-user-meta {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 20px;
    }

    .story-avatar {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: var(--accent-soft);
      border: 2px solid var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
      font-size: 1.2rem;
    }

    .story-quote {
      font-size: 1.05rem;
      color: var(--text-main);
      line-height: 1.8;
      font-style: italic;
      margin-bottom: 24px;
    }

    .story-badge {
      display: inline-block;
      padding: 4px 12px;
      background: #F1F5F9;
      border-radius: var(--radius-pill);
      font-size: 0.8rem;
      color: #475569;
      font-weight: 500;
    }

    /* 9. 媒体口碑与车主评价 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .review-card {
      background: #FFFFFF;
      padding: 32px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .review-stars {
      color: #F59E0B;
      font-size: 1.1rem;
      margin-bottom: 16px;
    }

    .review-body {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      flex-grow: 1;
    }

    .review-source {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--secondary);
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

    /* 10. 资讯与技术动态 */
    .news-section {
      background: var(--bg-light);
    }

    .news-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .news-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .news-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }

    .news-thumb {
      height: 160px;
      width: 100%;
    }

    .news-content {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    .news-date {
      font-size: 0.8rem;
      color: #94A3B8;
      margin-bottom: 8px;
    }

    .news-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--secondary);
      line-height: 1.4;
      margin-bottom: 10px;
    }

    .news-summary {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 14px;
      flex-grow: 1;
    }

    /* 11. FAQ 手风琴 */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
      transition: var(--transition);
    }

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

    .faq-title {
      padding: 22px 28px;
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--secondary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-indicator {
      font-size: 1.4rem;
      color: var(--primary);
      font-weight: 400;
      transition: var(--transition);
    }

    .faq-content {
      padding: 0 28px 24px 28px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.8;
      display: block;
    }

    /* 12. 预约试驾与服务转化 */
    .booking-section {
      background: linear-gradient(135deg, #0A192F 0%, #0F172A 100%);
      color: #FFFFFF;
      padding: 80px 0;
      position: relative;
    }

    .booking-container {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-lg);
      padding: 48px;
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .booking-info h2 {
      font-size: 2.2rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 16px;
      color: #FFFFFF;
    }

    .booking-info p {
      color: #94A3B8;
      font-size: 1rem;
      line-height: 1.8;
      margin-bottom: 32px;
    }

    .booking-form {
      background: #FFFFFF;
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: 0 16px 36px rgba(0, 0, 0, 0.2);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-label {
      display: block;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--secondary);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background: #F8FAFC;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(0, 163, 137, 0.15);
    }

    /* 全局页脚 */
    .site-footer {
      background: #060911;
      color: #64748B;
      padding: 72px 0 32px 0;
      border-top: 1px solid #1E293B;
      font-size: 0.9rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr repeat(3, 1fr);
      gap: 48px;
      margin-bottom: 56px;
    }

    .footer-brand h3 {
      color: #F8FAFC;
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 24px;
      color: #94A3B8;
    }

    .footer-col h4 {
      color: #F1F5F9;
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .footer-links a:hover {
      color: var(--primary);
      padding-left: 4px;
    }

    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 32px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      color: #475569;
      font-size: 0.85rem;
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .tech-grid,
      .vision-layout,
      .booking-container {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .advantages-grid,
      .models-grid,
      .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .nav-menu {
        display: none;
      }
      .hero-title {
        font-size: 2.2rem;
      }
      .section-title {
        font-size: 1.8rem;
      }
      .advantages-grid,
      .models-grid,
      .scenarios-grid,
      .stories-grid,
      .reviews-grid,
      .news-grid,
      .stats-grid {
        grid-template-columns: 1fr;
      }
      .booking-container {
        padding: 24px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }