/* roulang page: index */
:root {
      --bg-main: #f8fafc;
      --bg-white: #ffffff;
      --bg-dark: #0b0f15;
      --bg-card-dark: #121721;
      --text-main: #0f172a;
      --text-muted: #334155;
      --text-sub: #64748b;
      --text-light: #f1f5f9;
      --text-silver: #94a3b8;
      --primary: #007aff;
      --primary-hover: #0062cc;
      --accent: #00c58e;
      --gold: #c5a880;
      --border-light: #e2e8f0;
      --border-dark: rgba(255, 255, 255, 0.08);
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.06);
      --shadow-lg: 0 12px 30px rgba(0, 0, 0, 0.1);
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --container-max: 1280px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", PingFang SC, "Hiragino Sans GB", "Microsoft YaHei", Inter, system-ui, sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.7;
      overflow-x: hidden;
    }

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

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }

    button, input, select, textarea {
      font: inherit;
    }

    .tabular {
      font-variant-numeric: tabular-nums;
    }

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

    /* 顶部辅助条 */
    .top-bar {
      height: 38px;
      background-color: var(--bg-dark);
      color: var(--text-silver);
      font-size: 0.8125rem;
      border-bottom: 1px solid var(--border-dark);
      display: flex;
      align-items: center;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .top-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--accent);
    }
    .top-badge-dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background-color: var(--accent);
    }
    .top-links {
      display: flex;
      gap: 20px;
    }

    /* 主导航 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-light);
      transition: all 0.3s ease;
    }
    .nav-inner {
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.35rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--text-main);
    }
    .logo-symbol {
      width: 34px;
      height: 34px;
      background: linear-gradient(135deg, var(--primary) 0%, #004ecc 100%);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 800;
      font-size: 1.1rem;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-menu a {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
      padding: 6px 0;
    }
    .nav-menu a:hover, .nav-menu a.active {
      color: var(--primary);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      font-size: 0.875rem;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: all 0.2s ease;
      white-space: nowrap;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #fff;
      box-shadow: var(--shadow-md);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(0, 122, 255, 0.25);
    }
    .btn-outline {
      background-color: transparent;
      border-color: var(--border-light);
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: rgba(0, 122, 255, 0.04);
    }
    .btn-dark {
      background-color: #1e293b;
      color: #fff;
    }
    .btn-dark:hover {
      background-color: #0f172a;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .menu-toggle span {
      display: block;
      width: 22px;
      height: 2px;
      background-color: var(--text-main);
      margin: 5px 0;
      transition: 0.3s;
    }

    /* 板块通用架构 */
    section {
      padding: 88px 0;
      position: relative;
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-header.text-center {
      text-align: center;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }
    .kicker {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 700;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 2.125rem;
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.5px;
      color: var(--text-main);
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-sub);
      line-height: 1.75;
    }

    /* 板块 1: 首屏 (文档/帮助型居中搜索风格 + 强视觉) */
    .hero-section {
      position: relative;
      padding: 84px 0 100px;
      background: linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
      border-bottom: 1px solid var(--border-light);
      overflow: hidden;
    }
    .hero-bg-overlay {
      position: absolute;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
      opacity: 0.08;
      background-image: url('/assets/images/b9bf56804223a0e3.webp');
      background-size: cover;
      background-position: center;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      margin: 0 auto;
      text-align: center;
    }
    .hero-badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background-color: rgba(0, 122, 255, 0.08);
      border: 1px solid rgba(0, 122, 255, 0.2);
      border-radius: 999px;
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
    }
    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -1px;
      color: var(--text-main);
      margin-bottom: 20px;
    }
    .hero-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 36px;
      text-align: justify;
      text-align-last: center;
    }
    /* 居中搜索组件 */
    .hero-search-box {
      max-width: 680px;
      margin: 0 auto 20px;
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
      display: flex;
      align-items: center;
      padding: 6px 8px 6px 18px;
    }
    .hero-search-box input {
      flex: 1;
      border: none;
      outline: none;
      font-size: 0.95rem;
      color: var(--text-main);
      background: transparent;
    }
    .hero-chips {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      gap: 10px;
      font-size: 0.8125rem;
      color: var(--text-sub);
    }
    .chip {
      background: #ffffff;
      border: 1px solid var(--border-light);
      padding: 4px 12px;
      border-radius: 999px;
      color: var(--text-muted);
      transition: all 0.2s;
    }
    .chip:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    /* 板块 2: 分类入口 */
    .bg-white {
      background-color: var(--bg-white);
    }
    .category-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .category-card {
      background: var(--bg-main);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .category-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .cat-icon {
      font-size: 1.5rem;
      color: var(--primary);
      margin-bottom: 16px;
      font-weight: 700;
    }
    .cat-title {
      font-size: 1.125rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .cat-desc {
      font-size: 0.875rem;
      color: var(--text-sub);
      line-height: 1.6;
      flex: 1;
      margin-bottom: 16px;
    }
    .cat-link {
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 板块 3: 技术架构与核心参数矩阵 (全景介绍) */
    .overview-split {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .split-media {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-light);
    }
    .param-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 24px;
    }
    .param-box {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      padding: 16px;
      border-radius: var(--radius-sm);
    }
    .param-label {
      font-size: 0.75rem;
      color: var(--text-sub);
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 4px;
    }
    .param-val {
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--text-main);
    }

    /* 板块 4: 研发优势 (6卡网格) */
    .grid-3col {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 30px;
      transition: all 0.25s ease;
      position: relative;
    }
    .feature-card:hover {
      border-color: rgba(0, 122, 255, 0.4);
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .feature-card-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .feat-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary);
      background: rgba(0, 122, 255, 0.08);
      padding: 2px 8px;
      border-radius: 3px;
    }
    .feature-title {
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .feature-text {
      font-size: 0.875rem;
      color: var(--text-sub);
      line-height: 1.7;
    }

    /* 板块 5: 旗舰产品展区 */
    .product-card {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
    }
    .product-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .product-thumb {
      height: 210px;
      overflow: hidden;
      position: relative;
    }
    .product-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .product-card:hover .product-thumb img {
      transform: scale(1.04);
    }
    .product-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .product-badge-row {
      display: flex;
      gap: 8px;
      margin-bottom: 12px;
    }
    .badge-grade {
      font-size: 0.6875rem;
      background: #0f172a;
      color: #fff;
      padding: 2px 6px;
      border-radius: 2px;
      font-weight: 600;
    }
    .badge-sec {
      font-size: 0.6875rem;
      background: rgba(0, 197, 142, 0.15);
      color: #059669;
      padding: 2px 6px;
      border-radius: 2px;
      font-weight: 600;
    }
    .product-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .product-desc {
      font-size: 0.875rem;
      color: var(--text-sub);
      margin-bottom: 20px;
      line-height: 1.6;
    }
    .product-specs {
      background: var(--bg-main);
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      font-size: 0.8125rem;
      margin-bottom: 20px;
      flex: 1;
    }
    .spec-item {
      display: flex;
      justify-content: space-between;
      padding: 4px 0;
      border-bottom: 1px dashed var(--border-light);
    }
    .spec-item:last-child {
      border-bottom: none;
    }
    .spec-key {
      color: var(--text-sub);
    }
    .spec-val {
      font-weight: 600;
      color: var(--text-main);
    }

    /* 板块 6: 严苛车载工况理念 (曜石深色区) */
    .dark-section {
      background-color: var(--bg-dark);
      color: var(--text-light);
      border-top: 1px solid var(--border-dark);
      border-bottom: 1px solid var(--border-dark);
    }
    .dark-section .section-title {
      color: #ffffff;
    }
    .dark-section .section-desc {
      color: var(--text-silver);
    }
    .dark-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .dark-card {
      background: var(--bg-card-dark);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 28px;
    }
    .dark-card-title {
      font-size: 1.125rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 10px;
    }
    .dark-card-desc {
      font-size: 0.875rem;
      color: var(--text-silver);
      line-height: 1.7;
    }

    /* 板块 7: 数据统计条 Metric Strip */
    .metric-strip-section {
      background: #0f172a;
      color: #ffffff;
      padding: 56px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    .metric-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .metric-item {
      border-right: 1px solid rgba(255, 255, 255, 0.08);
      padding: 0 16px;
    }
    .metric-item:last-child {
      border-right: none;
    }
    .metric-num {
      font-size: 2.5rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .metric-name {
      font-size: 0.875rem;
      font-weight: 600;
      color: #e2e8f0;
      margin-bottom: 4px;
    }
    .metric-detail {
      font-size: 0.75rem;
      color: var(--text-silver);
    }

    /* 板块 8: 热门排行与选型阶梯 (Rankings / Tier List) */
    .rank-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .rank-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px;
      position: relative;
    }
    .rank-badge-num {
      position: absolute;
      top: 20px;
      right: 20px;
      font-size: 2.25rem;
      font-weight: 900;
      color: #f1f5f9;
      line-height: 1;
    }
    .rank-header {
      font-size: 1.125rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .rank-field {
      font-size: 0.8125rem;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 16px;
    }
    .rank-summary {
      font-size: 0.875rem;
      color: var(--text-sub);
      line-height: 1.65;
      margin-bottom: 20px;
    }
    .rank-metrics {
      display: flex;
      justify-content: space-between;
      border-top: 1px solid var(--border-light);
      padding-top: 14px;
      font-size: 0.8125rem;
    }

    /* 板块 9: 整车工程落地案例 (成功证明) */
    .case-card {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .case-img {
      height: 190px;
      overflow: hidden;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-info {
      padding: 24px;
      flex: 1;
    }
    .case-meta {
      font-size: 0.75rem;
      color: var(--text-sub);
      margin-bottom: 8px;
    }
    .case-h3 {
      font-size: 1.125rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .case-p {
      font-size: 0.875rem;
      color: var(--text-sub);
      line-height: 1.65;
    }

    /* 板块 10: 产业前沿资讯 */
    .news-card {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .news-date {
      font-size: 0.75rem;
      color: var(--text-sub);
      margin-bottom: 10px;
    }
    .news-title {
      font-size: 1.0625rem;
      font-weight: 700;
      line-height: 1.4;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .news-excerpt {
      font-size: 0.875rem;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .news-action {
      align-self: flex-start;
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--primary);
    }

    /* 板块 11: 合作伙伴 / 体系协同 */
    .partner-logo-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 16px;
      align-items: center;
    }
    .partner-pill {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      padding: 16px 12px;
      text-align: center;
      border-radius: var(--radius-sm);
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    /* 板块 12: 车规级安全认证与质量保障条 (保障条) */
    .guarantee-bar {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 32px 40px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      box-shadow: var(--shadow-sm);
    }
    .guarantee-col {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .guarantee-col-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .guarantee-col-desc {
      font-size: 0.8125rem;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 板块 13: 选型支持 FAQ */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: border-color 0.2s;
    }
    .faq-item:hover {
      border-color: rgba(0, 122, 255, 0.4);
    }
    .faq-toggle {
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      padding: 20px 24px;
      font-size: 1.0625rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-icon {
      font-size: 1.25rem;
      color: var(--primary);
      transition: transform 0.25s ease;
      line-height: 1;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #fafcff;
      border-top: 0px solid var(--border-light);
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.75;
      padding: 0 24px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-item.active .faq-answer {
      max-height: 240px;
      padding: 16px 24px 20px;
      border-top-width: 1px;
    }

    /* 板块 14: 底部试用入口与样片申请表单 (唯一收口行动区) */
    .cta-card {
      background: radial-gradient(circle at 80% 20%, #1e293b 0%, #0b0f15 100%);
      border-radius: var(--radius-lg);
      padding: 64px 48px;
      color: #ffffff;
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 48px;
      align-items: center;
      box-shadow: var(--shadow-lg);
    }
    .cta-info h2 {
      font-size: 2.125rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 16px;
      color: #ffffff;
    }
    .cta-info p {
      font-size: 0.9375rem;
      color: var(--text-silver);
      line-height: 1.75;
      margin-bottom: 24px;
    }
    .cta-perks {
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 0.875rem;
      color: #cbd5e1;
    }
    .cta-perk-item {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .cta-form {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 32px;
      color: var(--text-main);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-label {
      display: block;
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--text-muted);
      margin-bottom: 6px;
    }
    .form-input, .form-select {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      font-size: 0.875rem;
      background: var(--bg-main);
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s;
    }
    .form-input:focus, .form-select:focus {
      border-color: var(--primary);
      background: #ffffff;
    }
    .form-tips {
      font-size: 0.75rem;
      color: var(--text-sub);
      margin-top: 12px;
      line-height: 1.5;
    }

    /* 页脚 */
    .site-footer {
      background-color: var(--bg-dark);
      color: var(--text-silver);
      padding: 72px 0 32px;
      border-top: 1px solid var(--border-dark);
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 48px;
      margin-bottom: 56px;
    }
    .footer-brand .logo {
      color: #ffffff;
      margin-bottom: 16px;
    }
    .footer-brand p {
      font-size: 0.875rem;
      color: var(--text-silver);
      line-height: 1.75;
      max-width: 360px;
    }
    .footer-heading {
      font-size: 0.9375rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 20px;
      letter-spacing: 0.5px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      font-size: 0.875rem;
      color: var(--text-silver);
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .footer-contact-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 0.875rem;
      color: var(--text-silver);
    }
    .footer-bottom {
      border-top: 1px solid var(--border-dark);
      padding-top: 32px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.8125rem;
      color: #64748b;
    }
    .footer-icp a:hover {
      color: var(--text-silver);
    }

    /* 响应式断点适配 */
    @media (max-width: 1024px) {
      .category-grid, .partner-logo-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .grid-3col, .dark-grid, .rank-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metric-row {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
      }
      .metric-item:nth-child(2) {
        border-right: none;
      }
      .guarantee-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
        gap: 36px;
      }
      .overview-split {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      section {
        padding: 56px 0;
      }
      .top-bar {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 24px;
        border-bottom: 1px solid var(--border-light);
        gap: 16px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        transition: transform 0.3s ease;
      }
      .nav-menu.open {
        transform: translateY(0);
      }
      .nav-actions {
        display: none;
      }
      .hero-h1 {
        font-size: 2rem;
      }
      .hero-desc {
        text-align: left;
      }
      .category-grid, .grid-3col, .dark-grid, .rank-grid, .partner-logo-grid {
        grid-template-columns: 1fr;
      }
      .metric-row {
        grid-template-columns: 1fr;
      }
      .metric-item {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        padding-bottom: 16px;
      }
      .metric-item:last-child {
        border-bottom: none;
      }
      .guarantee-bar {
        grid-template-columns: 1fr;
        padding: 24px;
      }
      .cta-card {
        grid-template-columns: 1fr;
        padding: 32px 24px;
      }
      .cta-form {
        padding: 20px;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }