/* roulang page: index */
:root {
      --bg-dark: #0b0f19;
      --bg-card: #161b26;
      --bg-card-hover: #1e2638;
      --bg-light: #f8fafc;
      --bg-surface: #ffffff;
      --primary: #00e5ff;
      --primary-hover: #00b8cc;
      --primary-glow: rgba(0, 229, 255, 0.25);
      --accent-blue: #2563eb;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --text-white: #f8fafc;
      --text-white-muted: #94a3b8;
      --border-light: #e2e8f0;
      --border-dark: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 229, 255, 0.35);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --radius-xl: 24px;
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
      --shadow-glow: 0 0 25px rgba(0, 229, 255, 0.15);
      --container-max: 1240px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      width: 100%;
    }

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

    ul, ol {
      list-style: none;
    }

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

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

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

    /* 顶部双行导航 */
    .top-bar {
      background: #080c14;
      color: var(--text-white-muted);
      font-size: 0.8125rem;
      border-bottom: 1px solid var(--border-dark);
      padding: 6px 0;
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-links {
      display: flex;
      gap: 20px;
    }
    .top-links span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .header-main {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(11, 15, 25, 0.92);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      transition: var(--transition);
    }
    .header-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: 800;
      letter-spacing: -0.5px;
      color: var(--text-white);
    }
    .brand-logo svg {
      width: 30px;
      height: 30px;
      fill: var(--primary);
    }
    .brand-badge {
      font-size: 0.7rem;
      background: rgba(0, 229, 255, 0.15);
      color: var(--primary);
      padding: 2px 8px;
      border-radius: 20px;
      font-weight: 600;
      border: 1px solid var(--primary-glow);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-item {
      color: var(--text-white-muted);
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 0;
      position: relative;
    }
    .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);
      box-shadow: 0 0 8px var(--primary);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn-nav-drive {
      background: var(--primary);
      color: #041017;
      padding: 9px 20px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 0.9rem;
      box-shadow: 0 0 16px var(--primary-glow);
      transition: var(--transition);
      display: inline-block;
    }
    .btn-nav-drive:hover {
      background: #40eeff;
      transform: translateY(-1px);
      box-shadow: 0 0 22px rgba(0, 229, 255, 0.45);
    }
    .mobile-toggle {
      display: none;
      background: transparent;
      color: var(--text-white);
      font-size: 1.5rem;
      cursor: pointer;
    }

    /* 通用组件 */
    .section-wrap {
      padding: 90px 0;
      position: relative;
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: var(--text-white);
    }
    .section-light {
      background-color: #f1f5f9;
      color: var(--text-main);
    }
    .section-white {
      background-color: var(--bg-surface);
      color: var(--text-main);
    }
    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 56px auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      color: var(--primary);
      background: rgba(0, 229, 255, 0.1);
      padding: 4px 14px;
      border-radius: 30px;
      margin-bottom: 14px;
      border: 1px solid rgba(0, 229, 255, 0.25);
    }
    .section-tag.light-theme {
      color: var(--accent-blue);
      background: rgba(37, 99, 235, 0.08);
      border-color: rgba(37, 99, 235, 0.2);
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.25;
      margin-bottom: 16px;
    }
    .section-subtitle {
      font-size: 1.05rem;
      line-height: 1.7;
      color: var(--text-white-muted);
    }
    .section-subtitle.light-theme {
      color: var(--text-muted);
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      font-size: 0.95rem;
      font-weight: 700;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: var(--transition);
      min-height: 48px;
    }
    .btn-primary {
      background: var(--primary);
      color: #07131b;
      box-shadow: 0 0 20px var(--primary-glow);
    }
    .btn-primary:hover {
      background: #38edff;
      transform: translateY(-2px);
      box-shadow: 0 0 30px rgba(0, 229, 255, 0.45);
    }
    .btn-outline-white {
      background: rgba(255, 255, 255, 0.05);
      color: var(--text-white);
      border: 1px solid rgba(255, 255, 255, 0.25);
    }
    .btn-outline-white:hover {
      background: rgba(255, 255, 255, 0.15);
      border-color: var(--text-white);
    }
    .btn-outline-dark {
      background: transparent;
      color: var(--text-main);
      border: 1px solid var(--border-light);
    }
    .btn-outline-dark:hover {
      background: #f8fafc;
      border-color: var(--text-main);
    }

    /* 1. 首屏视觉焦点（Hero 轮播与短问卷自测） */
    .hero-section {
      background: linear-gradient(180deg, #090d16 0%, #0f1624 100%);
      color: var(--text-white);
      padding: 60px 0 80px 0;
      position: relative;
      overflow: hidden;
    }
    .hero-bg-media {
      position: absolute;
      top: 0;
      right: 0;
      width: 60%;
      height: 100%;
      opacity: 0.35;
      object-fit: cover;
      mix-blend-mode: lighten;
      pointer-events: none;
      mask-image: linear-gradient(to right, transparent, black 40%);
      -webkit-mask-image: linear-gradient(to left, black 60%, transparent 100%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(0, 229, 255, 0.1);
      border: 1px solid var(--primary-glow);
      color: var(--primary);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 3.1rem;
      font-weight: 800;
      letter-spacing: -1px;
      line-height: 1.15;
      margin-bottom: 20px;
    }
    .hero-desc {
      font-size: 1.05rem;
      line-height: 1.75;
      color: var(--text-white-muted);
      margin-bottom: 32px;
      max-width: 580px;
    }
    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }
    .hero-stats-quick {
      display: flex;
      gap: 32px;
      border-top: 1px solid var(--border-dark);
      padding-top: 24px;
    }
    .stat-quick-item .num {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--primary);
      font-family: monospace;
    }
    .stat-quick-item .lbl {
      font-size: 0.8rem;
      color: var(--text-white-muted);
    }

    /* 蓝图：Hero 选型自测仪表盘卡片 */
    .hero-quiz-card {
      background: var(--bg-card);
      border: 1px solid var(--border-glow);
      box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
      border-radius: var(--radius-lg);
      padding: 28px;
      backdrop-filter: blur(12px);
    }
    .quiz-card-header {
      border-bottom: 1px solid var(--border-dark);
      padding-bottom: 16px;
      margin-bottom: 20px;
    }
    .quiz-card-header h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 4px;
    }
    .quiz-card-header p {
      font-size: 0.85rem;
      color: var(--text-white-muted);
    }
    .quiz-options-group {
      display: grid;
      gap: 12px;
      margin-bottom: 20px;
    }
    .quiz-label {
      font-size: 0.82rem;
      color: var(--primary);
      font-weight: 600;
    }
    .quiz-select-btn-group {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 8px;
    }
    .quiz-opt-btn {
      background: #0f1420;
      border: 1px solid rgba(255, 255, 255, 0.1);
      color: var(--text-white-muted);
      padding: 8px 4px;
      border-radius: var(--radius-sm);
      font-size: 0.82rem;
      font-weight: 600;
      cursor: pointer;
      text-align: center;
      transition: var(--transition);
    }
    .quiz-opt-btn.active, .quiz-opt-btn:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(0, 229, 255, 0.08);
    }
    .quiz-result-preview {
      background: rgba(0, 0, 0, 0.3);
      border: 1px dashed var(--border-dark);
      border-radius: var(--radius-sm);
      padding: 12px 16px;
      margin-bottom: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .match-tag {
      font-size: 0.75rem;
      background: rgba(0, 229, 255, 0.15);
      color: var(--primary);
      padding: 2px 8px;
      border-radius: 4px;
    }
    .match-model {
      font-weight: 700;
      color: var(--text-white);
      font-size: 0.95rem;
    }

    /* 2. 行业痛点与出行变革 (Pain Points & Mobility Shift) */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .pain-card {
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #cbd5e1;
    }
    .pain-vs-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: #ef4444;
      background: rgba(239, 68, 68, 0.08);
      padding: 2px 8px;
      border-radius: 4px;
      align-self: flex-start;
      margin-bottom: 12px;
    }
    .pain-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .pain-old {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      padding-bottom: 16px;
      border-bottom: 1px dashed var(--border-light);
    }
    .pain-shift {
      font-size: 0.92rem;
      color: var(--accent-blue);
      font-weight: 600;
      line-height: 1.6;
    }

    /* 3. 品牌与全栈自研架构介绍区 (Tech Architecture) */
    .arch-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .arch-img-box {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-dark);
      box-shadow: 0 12px 35px rgba(0,0,0,0.5);
      position: relative;
    }
    .arch-img-box img {
      width: 100%;
      height: 420px;
      object-fit: cover;
    }
    .arch-badge-float {
      position: absolute;
      bottom: 20px;
      left: 20px;
      background: rgba(11, 15, 25, 0.88);
      backdrop-filter: blur(10px);
      border: 1px solid var(--primary-glow);
      padding: 12px 18px;
      border-radius: var(--radius-sm);
    }
    .arch-badge-float strong {
      display: block;
      color: var(--primary);
      font-size: 1.1rem;
    }
    .arch-badge-float span {
      font-size: 0.78rem;
      color: var(--text-white-muted);
    }
    .arch-info h3 {
      font-size: 2rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 20px;
    }
    .arch-info p {
      color: var(--text-white-muted);
      font-size: 0.98rem;
      line-height: 1.75;
      margin-bottom: 24px;
    }
    .arch-specs-list {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 24px;
    }
    .arch-spec-item {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border-dark);
      padding: 14px 16px;
      border-radius: var(--radius-sm);
    }
    .arch-spec-item h5 {
      color: var(--primary);
      font-size: 0.85rem;
      margin-bottom: 4px;
    }
    .arch-spec-item p {
      font-size: 0.8rem;
      color: var(--text-white-muted);
      margin: 0;
      line-height: 1.4;
    }

    /* 4. 核心技术优势矩阵 (Core Advantages 6宫格) */
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--bg-card);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: var(--transition);
      position: relative;
    }
    .adv-card:hover {
      border-color: var(--primary-glow);
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
    }
    .adv-icon {
      width: 44px;
      height: 44px;
      background: rgba(0, 229, 255, 0.08);
      border: 1px solid var(--primary-glow);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: var(--primary);
      font-size: 1.25rem;
    }
    .adv-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 10px;
    }
    .adv-desc {
      font-size: 0.88rem;
      color: var(--text-white-muted);
      line-height: 1.65;
    }

    /* 5. 热门旗舰车型展示 (Hot Models Display 3大卡片) */
    .model-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .model-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .model-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .model-thumb {
      position: relative;
      height: 230px;
      overflow: hidden;
      background: #0d121c;
    }
    .model-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .model-card:hover .model-thumb img {
      transform: scale(1.05);
    }
    .model-type-badge {
      position: absolute;
      top: 14px;
      left: 14px;
      background: rgba(15, 23, 42, 0.85);
      color: var(--primary);
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 20px;
      border: 1px solid rgba(0, 229, 255, 0.3);
    }
    .model-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }
    .model-name {
      font-size: 1.45rem;
      font-weight: 800;
      margin-bottom: 6px;
    }
    .model-tagline {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 18px;
    }
    .model-specs-strip {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      background: #f8fafc;
      padding: 12px 8px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-light);
      text-align: center;
      margin-bottom: 20px;
    }
    .spec-strip-item .val {
      font-weight: 800;
      color: var(--accent-blue);
      font-size: 1rem;
      display: block;
    }
    .spec-strip-item .lab {
      font-size: 0.72rem;
      color: var(--text-muted);
    }
    .model-foot {
      margin-top: auto;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-top: 14px;
      border-top: 1px solid var(--border-light);
    }
    .model-price {
      font-size: 1.15rem;
      font-weight: 800;
      color: #0f172a;
    }
    .model-price span {
      font-size: 0.8rem;
      color: var(--text-muted);
      font-weight: normal;
    }

    /* 6. 沉浸式深色全景技术理念区 (Deep Dark Vision) */
    .vision-hero-banner {
      border-radius: var(--radius-xl);
      background: linear-gradient(135deg, #060911 0%, #111827 100%);
      border: 1px solid var(--border-glow);
      padding: 60px 48px;
      position: relative;
      overflow: hidden;
    }
    .vision-content-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .vision-lead-text {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-white);
      line-height: 1.3;
      margin-bottom: 20px;
    }
    .vision-desc {
      color: var(--text-white-muted);
      font-size: 0.95rem;
      line-height: 1.7;
      margin-bottom: 28px;
    }
    .vision-features-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .vision-f-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      color: var(--text-white);
      font-size: 0.9rem;
    }
    .vision-f-item svg {
      width: 18px;
      height: 18px;
      fill: var(--primary);
      flex-shrink: 0;
      margin-top: 3px;
    }

    /* 7. 真实智驾场景与用户故事区 (Scenario Stories) */
    .story-timeline {
      display: flex;
      flex-direction: column;
      gap: 48px;
    }
    .story-item {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .story-item:nth-child(even) {
      direction: rtl;
    }
    .story-item:nth-child(even) .story-text {
      direction: ltr;
    }
    .story-img-box {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-md);
      height: 320px;
    }
    .story-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .story-tag {
      color: var(--accent-blue);
      font-size: 0.8rem;
      font-weight: 700;
      margin-bottom: 8px;
      display: inline-block;
    }
    .story-title {
      font-size: 1.6rem;
      font-weight: 800;
      margin-bottom: 12px;
    }
    .story-desc {
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.7;
      margin-bottom: 18px;
    }
    .story-metric {
      font-size: 0.85rem;
      color: #0f172a;
      background: #f1f5f9;
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      display: inline-block;
      font-weight: 600;
    }

    /* 8. 关键硬核数据统计条 (Performance Metrics) */
    .metrics-bar {
      background: linear-gradient(90deg, #090d16 0%, #162033 100%);
      border-top: 1px solid var(--border-glow);
      border-bottom: 1px solid var(--border-glow);
      padding: 50px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-col .num-val {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      font-family: monospace;
      line-height: 1.1;
      margin-bottom: 8px;
    }
    .metric-col .lbl-name {
      color: var(--text-white);
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 4px;
    }
    .metric-col .desc-sub {
      color: var(--text-white-muted);
      font-size: 0.8rem;
    }

    /* 9. 真实车主与车媒评价 (Reviews) */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .review-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .review-stars {
      color: #f59e0b;
      font-size: 0.9rem;
      margin-bottom: 12px;
      letter-spacing: 2px;
    }
    .review-quote {
      font-size: 0.95rem;
      line-height: 1.65;
      color: var(--text-main);
      margin-bottom: 20px;
      flex: 1;
      font-style: normal;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-light);
      padding-top: 14px;
    }
    .reviewer-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--accent-blue);
      font-size: 0.9rem;
    }
    .reviewer-info h6 {
      font-size: 0.9rem;
      font-weight: 700;
    }
    .reviewer-info span {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* 10. 适用人群与场景生态 (Personas Ecosystem) */
    .persona-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .persona-card {
      background: var(--bg-card);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      transition: var(--transition);
    }
    .persona-card:hover {
      border-color: var(--border-glow);
      background: var(--bg-card-hover);
    }
    .persona-badge {
      font-size: 0.72rem;
      font-weight: 700;
      color: var(--primary);
      background: rgba(0, 229, 255, 0.1);
      padding: 2px 8px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .persona-name {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 8px;
    }
    .persona-desc {
      font-size: 0.85rem;
      color: var(--text-white-muted);
      line-height: 1.6;
    }

    /* 11. 前沿技术动态与资讯 (Tech News Digest) */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .news-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .news-card-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }
    .news-date {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .news-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .news-desc {
      font-size: 0.86rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex: 1;
    }
    .news-link {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--accent-blue);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 12. 常见问题手风琴 (FAQ) */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item.open {
      border-color: var(--border-glow);
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-white);
      font-weight: 700;
      font-size: 1.05rem;
      user-select: none;
    }
    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }
    .faq-item.open .faq-icon {
      transform: rotate(180deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, padding 0.35s ease;
      background: rgba(0, 0, 0, 0.2);
    }
    .faq-item.open .faq-answer {
      max-height: 250px;
      padding: 0 24px 20px 24px;
    }
    .faq-answer p {
      font-size: 0.9rem;
      color: var(--text-white-muted);
      line-height: 1.7;
    }

    /* 13. 终极试驾转化与预约配置区 (Final CTA Block) */
    .final-cta-box {
      background: linear-gradient(135deg, #090e18 0%, #131c2d 100%);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-xl);
      padding: 60px 48px;
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
      position: relative;
    }
    .cta-flex-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
    }
    .cta-text-side h3 {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-white);
      line-height: 1.25;
      margin-bottom: 16px;
    }
    .cta-text-side p {
      font-size: 1rem;
      color: var(--text-white-muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .cta-form-side {
      background: rgba(16, 22, 34, 0.95);
      border: 1px solid var(--border-dark);
      padding: 30px;
      border-radius: var(--radius-md);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-label {
      display: block;
      font-size: 0.8rem;
      color: var(--text-white-muted);
      margin-bottom: 6px;
      font-weight: 600;
    }
    .form-input, .form-select {
      width: 100%;
      background: #090d16;
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-sm);
      padding: 12px 14px;
      color: var(--text-white);
      font-size: 0.9rem;
      transition: var(--transition);
    }
    .form-input:focus, .form-select:focus {
      border-color: var(--primary);
      box-shadow: 0 0 10px var(--primary-glow);
    }
    .btn-submit-drive {
      width: 100%;
      background: var(--primary);
      color: #061017;
      font-weight: 800;
      padding: 14px;
      border-radius: var(--radius-sm);
      font-size: 1rem;
      cursor: pointer;
      transition: var(--transition);
      margin-top: 8px;
    }
    .btn-submit-drive:hover {
      background: #41eeff;
      box-shadow: 0 0 25px rgba(0, 229, 255, 0.5);
    }

    /* 页脚 (Footer) */
    .site-footer {
      background: #060910;
      color: var(--text-white-muted);
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 70px 0 30px 0;
      font-size: 0.88rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr repeat(3, 1fr);
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand h4 {
      color: var(--text-white);
      font-size: 1.3rem;
      font-weight: 800;
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 16px;
      color: var(--text-white-muted);
    }
    .footer-col h5 {
      color: var(--text-white);
      font-size: 0.95rem;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col ul li a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 24px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      font-size: 0.8rem;
    }
    .footer-legal a {
      margin-left: 16px;
      color: var(--text-white-muted);
    }
    .footer-legal a:hover {
      color: var(--text-white);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid, .arch-wrap, .vision-content-grid, .cta-flex-grid {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .pain-grid, .adv-grid, .model-grid, .review-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .persona-grid, .metrics-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;
      }
      .mobile-toggle {
        display: block;
      }
      .section-wrap {
        padding: 60px 0;
      }
      .hero-title {
        font-size: 2.2rem;
      }
      .section-title {
        font-size: 1.8rem;
      }
      .pain-grid, .adv-grid, .model-grid, .review-grid, .news-grid, .persona-grid {
        grid-template-columns: 1fr;
      }
      .story-item, .story-item:nth-child(even) {
        grid-template-columns: 1fr;
        direction: ltr;
      }
      .metrics-grid {
        grid-template-columns: 1fr;
        gap: 30px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .final-cta-box, .vision-hero-banner {
        padding: 32px 20px;
      }
      .mobile-menu-drawer {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: #0b0f19;
        border-bottom: 1px solid var(--border-glow);
        padding: 24px;
        display: flex;
        flex-direction: column;
        gap: 16px;
        z-index: 999;
      }
    }