/* roulang page: index */
:root {
      --primary: #0F62FE;
      --primary-cyan: #00D2D3;
      --primary-gradient: linear-gradient(135deg, #0F62FE 0%, #00D2D3 100%);
      --dark-navy: #0A1118;
      --dark-surface: #0B132B;
      --dark-card: #141E38;
      --accent-orange: #FF6B35;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --border-color: #E2E8F0;
      --border-dark: #233554;
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --radius-pill: 9999px;
      --shadow-sm: 0 4px 6px -1px rgba(15, 98, 254, 0.05);
      --shadow-md: 0 10px 30px -10px rgba(15, 98, 254, 0.08);
      --shadow-hover: 0 20px 40px -12px rgba(15, 98, 254, 0.18);
      --shadow-glow: 0 0 30px rgba(0, 210, 211, 0.25);
      --container-max: 1280px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

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

    body {
      font-family: 'Plus Jakarta Sans', 'Noto Sans SC', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

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

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

    ul, ol {
      list-style: none;
    }

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

    /* 顶部微栏与导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

    .top-micro-bar {
      background: #0A1118;
      color: #94A3B8;
      font-size: 12px;
      padding: 6px 0;
      border-bottom: 1px solid #1E293B;
    }

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

    .top-micro-items {
      display: flex;
      gap: 24px;
    }

    .top-micro-items span {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .nav-main {
      padding: 16px 0;
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 22px;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .logo-icon {
      width: 40px;
      height: 40px;
      background: var(--primary-gradient);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 20px;
      box-shadow: 0 4px 12px rgba(15, 98, 254, 0.3);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-item {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      position: relative;
      padding: 6px 0;
    }

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

    .nav-item.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary-gradient);
      border-radius: 2px;
    }

    .nav-cta-btn {
      background: var(--primary-gradient);
      color: #fff;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 14px;
      box-shadow: 0 4px 14px rgba(15, 98, 254, 0.25);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .nav-cta-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(15, 98, 254, 0.35);
      color: #fff;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 按钮通用体系 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #fff;
      box-shadow: 0 8px 24px rgba(15, 98, 254, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-3px);
      box-shadow: 0 12px 28px rgba(15, 98, 254, 0.4);
      color: #fff;
    }

    .btn-outline {
      background: transparent;
      border: 1px solid #CBD5E1;
      color: var(--text-main);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(15, 98, 254, 0.04);
    }

    .btn-orange {
      background: var(--accent-orange);
      color: #fff;
      box-shadow: 0 8px 20px rgba(255, 107, 53, 0.3);
    }

    .btn-orange:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(255, 107, 53, 0.4);
      color: #fff;
    }

    /* 徽章与标签 */
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 16px;
      background: rgba(15, 98, 254, 0.08);
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      border-radius: var(--radius-pill);
      border: 1px solid rgba(15, 98, 254, 0.15);
      margin-bottom: 16px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .badge-orange {
      background: rgba(255, 107, 53, 0.1);
      color: var(--accent-orange);
      border-color: rgba(255, 107, 53, 0.2);
    }

    .badge-dark {
      background: rgba(255, 255, 255, 0.1);
      color: #00D2D3;
      border-color: rgba(255, 255, 255, 0.15);
    }

    /* 板块通用头部 */
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 56px auto;
    }

    .section-title {
      font-size: 36px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .section-padding {
      padding: 96px 0;
    }

    /* 1. Hero 问答获客区 (线索获客提问式首屏) */
    .hero-section {
      position: relative;
      background: linear-gradient(180deg, #FFFFFF 0%, #EDF4FF 100%);
      padding: 80px 0 100px 0;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }

    .hero-h1 {
      font-size: 46px;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-h1 span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 17px;
      color: var(--text-body);
      line-height: 1.8;
      margin-bottom: 32px;
    }

    .hero-form-card {
      background: #FFFFFF;
      padding: 36px;
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 50px rgba(15, 98, 254, 0.12);
      border: 1px solid rgba(15, 98, 254, 0.1);
      position: relative;
    }

    .form-card-title {
      font-size: 20px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-card-subtitle {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 24px;
    }

    .hero-form-group {
      margin-bottom: 16px;
    }

    .hero-form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .hero-form-input, .hero-form-select {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      background: #F8FAFC;
      transition: var(--transition);
      color: var(--text-main);
    }

    .hero-form-input:focus, .hero-form-select:focus {
      outline: none;
      border-color: var(--primary);
      background: #FFF;
      box-shadow: 0 0 0 3px rgba(15, 98, 254, 0.15);
    }

    .hero-badges-bar {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 36px;
      padding-top: 24px;
      border-top: 1px solid rgba(15, 98, 254, 0.1);
    }

    .hero-metric-pill {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 8px 16px;
      background: #FFFFFF;
      border-radius: var(--radius-pill);
      box-shadow: var(--shadow-sm);
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      border: 1px solid rgba(226, 232, 240, 0.8);
    }

    .hero-metric-pill i {
      color: var(--primary);
    }

    /* 2. 问题陈述与行业痛点 */
    .problem-section {
      background: #FFFFFF;
    }

    .problem-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .problem-card {
      background: #F8FAFC;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 36px 28px;
      transition: var(--transition);
      position: relative;
    }

    .problem-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(15, 98, 254, 0.3);
    }

    .problem-icon {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: rgba(255, 107, 53, 0.1);
      color: var(--accent-orange);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 20px;
    }

    .problem-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .problem-text {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 3. 智能座舱系统产品架构与硬核参数 */
    .system-section {
      background: #F1F5F9;
    }

    .system-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }

    .system-img-wrap {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      position: relative;
    }

    .system-img-wrap img {
      width: 100%;
      height: 420px;
      object-fit: cover;
    }

    .system-spec-box {
      background: #FFFFFF;
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .spec-item:last-child {
      margin-bottom: 0;
    }

    .spec-icon {
      width: 44px;
      height: 44px;
      flex-shrink: 0;
      background: rgba(15, 98, 254, 0.1);
      color: var(--primary);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
    }

    .spec-content h4 {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }

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

    /* 4. 核心优势六卡网格 (Core Advantages) */
    .advantages-section {
      background: #FFFFFF;
    }

    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .advantage-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 36px 30px;
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }

    .advantage-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: var(--primary-gradient);
      opacity: 0;
      transition: var(--transition);
    }

    .advantage-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(15, 98, 254, 0.2);
    }

    .advantage-card:hover::before {
      opacity: 1;
    }

    .advantage-icon {
      width: 56px;
      height: 56px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(15, 98, 254, 0.1) 0%, rgba(0, 210, 211, 0.1) 100%);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      margin-bottom: 22px;
    }

    .advantage-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .advantage-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 5. 热门座舱产品序列 (Hot Solutions) */
    .solutions-section {
      background: #F8FAFC;
    }

    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

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

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

    .solution-cover {
      height: 220px;
      position: relative;
      overflow: hidden;
    }

    .solution-cover img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

    .solution-card:hover .solution-cover img {
      transform: scale(1.05);
    }

    .solution-tag {
      position: absolute;
      top: 16px;
      left: 16px;
      background: rgba(10, 17, 24, 0.85);
      backdrop-filter: blur(8px);
      color: #00D2D3;
      padding: 4px 12px;
      border-radius: var(--radius-pill);
      font-size: 12px;
      font-weight: 700;
    }

    .solution-body {
      padding: 30px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }

    .solution-title {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .solution-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .solution-feature-list {
      margin-bottom: 24px;
      flex-grow: 1;
    }

    .solution-feature-list li {
      font-size: 13px;
      color: var(--text-body);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .solution-feature-list li i {
      color: #00D2D3;
      font-size: 12px;
    }

    /* 6. 深色沉浸式座舱案例 (Dark Immersive Showcase) */
    .dark-showcase-section {
      background: var(--dark-surface);
      color: #FFFFFF;
      position: relative;
    }

    .dark-showcase-grid {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 50px;
      align-items: center;
    }

    .dark-text h2 {
      font-size: 36px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 20px;
    }

    .dark-text p {
      font-size: 16px;
      color: #94A3B8;
      line-height: 1.8;
      margin-bottom: 30px;
    }

    .dark-feature-pills {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .dark-pill {
      background: var(--dark-card);
      border: 1px solid var(--border-dark);
      padding: 16px 20px;
      border-radius: var(--radius-md);
    }

    .dark-pill h4 {
      font-size: 16px;
      color: #00D2D3;
      margin-bottom: 6px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .dark-pill p {
      font-size: 13px;
      color: #94A3B8;
      margin: 0;
      line-height: 1.5;
    }

    .dark-img-box {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-dark);
      box-shadow: var(--shadow-glow);
    }

    .dark-img-box img {
      width: 100%;
      height: 440px;
      object-fit: cover;
    }

    /* 7. 关键性能与里程碑数据条 (Data Counter Bar) */
    .metrics-bar-section {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
      padding: 60px 0;
    }

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

    .metric-item {
      padding: 20px;
      border-right: 1px solid var(--border-color);
    }

    .metric-item:last-child {
      border-right: none;
    }

    .metric-number {
      font-size: 46px;
      font-weight: 900;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      line-height: 1.1;
      margin-bottom: 8px;
      font-family: 'Plus Jakarta Sans', sans-serif;
    }

    .metric-label {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .metric-desc {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 8. 车企落地应用故事 (User Stories) */
    .stories-section {
      background: #F8FAFC;
    }

    .story-card-large {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      margin-bottom: 30px;
    }

    .story-card-large:last-child {
      margin-bottom: 0;
    }

    .story-cover {
      height: 100%;
      min-height: 320px;
    }

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

    .story-body {
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .story-badge {
      display: inline-block;
      align-self: flex-start;
      background: rgba(15, 98, 254, 0.08);
      color: var(--primary);
      font-size: 12px;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: var(--radius-pill);
      margin-bottom: 12px;
    }

    .story-title {
      font-size: 24px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .story-desc {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.75;
      margin-bottom: 20px;
    }

    .story-result-chips {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .story-chip {
      background: #F1F5F9;
      padding: 6px 14px;
      border-radius: var(--radius-sm);
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
    }

    /* 9. 行业客户评价体系 (Client Reviews) */
    .reviews-section {
      background: #FFFFFF;
    }

    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .review-card {
      background: #F8FAFC;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }

    .review-card:hover {
      box-shadow: var(--shadow-md);
      border-color: rgba(15, 98, 254, 0.2);
    }

    .review-stars {
      color: #FFB800;
      font-size: 14px;
      margin-bottom: 16px;
    }

    .review-text {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.75;
      margin-bottom: 24px;
      font-style: italic;
    }

    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .reviewer-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }

    .reviewer-meta h5 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

    .reviewer-meta span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 10. 技术与行业资讯摘要 (News Digest) */
    .news-section {
      background: #F8FAFC;
    }

    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

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

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

    .news-cover {
      height: 180px;
    }

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

    .news-body {
      padding: 24px;
    }

    .news-date {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 8px;
    }

    .news-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.4;
      margin-bottom: 12px;
    }

    .news-summary {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 11. 车规级平台合规与安全保障 (Safety & Assurance) */
    .safety-section {
      background: #FFFFFF;
    }

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

    .safety-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      text-align: center;
      transition: var(--transition);
    }

    .safety-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
    }

    .safety-icon {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      background: rgba(15, 98, 254, 0.06);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      margin: 0 auto 20px auto;
    }

    .safety-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .safety-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 12. 技术选型快速解答对照 (Quick Decision Matrix) */
    .matrix-section {
      background: #F8FAFC;
    }

    .table-container {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

    .matrix-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    .matrix-table th, .matrix-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }

    .matrix-table th {
      background: #F1F5F9;
      color: var(--text-main);
      font-weight: 700;
    }

    .matrix-table tr:last-child td {
      border-bottom: none;
    }

    .matrix-table tr:hover td {
      background: #F8FAFC;
    }

    .matrix-highlight {
      color: var(--primary);
      font-weight: 700;
    }

    /* 13. 智能座舱高频 FAQ 手风琴 (FAQ Accordion) */
    .faq-section {
      background: #FFFFFF;
    }

    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

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

    .faq-item[open] {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }

    .faq-summary {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-summary::-webkit-details-marker {
      display: none;
    }

    .faq-summary::after {
      content: '\f078';
      font-family: 'Font Awesome 6 Free';
      font-weight: 900;
      font-size: 14px;
      color: var(--text-muted);
      transition: transform 0.3s ease;
    }

    .faq-item[open] .faq-summary::after {
      transform: rotate(180deg);
      color: var(--primary);
    }

    .faq-content {
      padding: 0 24px 22px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.75;
    }

    /* 转化表单与收口行动区 */
    .cta-lead-section {
      background: linear-gradient(135deg, #0A1118 0%, #141E38 100%);
      color: #FFFFFF;
      position: relative;
      overflow: hidden;
    }

    .cta-box {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-lg);
      padding: 60px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .cta-text h2 {
      font-size: 36px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 20px;
    }

    .cta-text p {
      font-size: 16px;
      color: #94A3B8;
      line-height: 1.8;
      margin-bottom: 30px;
    }

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

    .form-full {
      grid-column: span 2;
    }

    .cta-input {
      width: 100%;
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.15);
      background: rgba(255, 255, 255, 0.05);
      color: #FFFFFF;
      font-size: 14px;
      transition: var(--transition);
    }

    .cta-input:focus {
      outline: none;
      border-color: #00D2D3;
      background: rgba(255, 255, 255, 0.1);
      box-shadow: 0 0 0 3px rgba(0, 210, 211, 0.2);
    }

    /* 页脚设计 */
    .site-footer {
      background: #060B10;
      color: #94A3B8;
      padding: 80px 0 30px 0;
      border-top: 1px solid #1E293B;
      font-size: 14px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 60px;
    }

    .footer-brand h3 {
      font-size: 22px;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .footer-desc {
      line-height: 1.7;
      margin-bottom: 24px;
      max-width: 320px;
    }

    .footer-col h4 {
      font-size: 16px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 20px;
    }

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

    .footer-links a:hover {
      color: #00D2D3;
    }

    .footer-contact li {
      margin-bottom: 12px;
      display: flex;
      align-items: flex-start;
      gap: 10px;
    }

    .footer-bottom {
      padding-top: 30px;
      border-top: 1px solid #141E2E;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }

    /* 响应式断点处理 */
    @media (max-width: 1024px) {
      .hero-grid, .system-grid, .dark-showcase-grid, .story-card-large, .cta-box {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .advantages-grid, .solutions-grid, .news-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .problem-grid, .safety-grid, .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metric-item:nth-child(2) {
        border-right: none;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .top-micro-bar {
        display: none;
      }
      .nav-links, .nav-cta-btn {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-h1 {
        font-size: 32px;
      }
      .section-title {
        font-size: 28px;
      }
      .advantages-grid, .solutions-grid, .news-grid, .reviews-grid, .problem-grid, .safety-grid, .faq-grid {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: 1fr;
      }
      .metric-item {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
      }
      .metric-item:last-child {
        border-bottom: none;
      }
      .cta-form-grid {
        grid-template-columns: 1fr;
      }
      .form-full {
        grid-column: span 1;
      }
      .cta-box {
        padding: 30px 20px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
      }
    }