/* roulang page: index */
:root {
      --primary: #0F2438;
      --primary-dark: #0B1320;
      --accent: #1D4ED8;
      --accent-hover: #1e40af;
      --highlight: #EA580C;
      --highlight-hover: #c2410c;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(15, 36, 56, 0.08), 0 2px 4px -2px rgba(15, 36, 56, 0.05);
      --shadow-lg: 0 12px 24px -4px rgba(15, 36, 56, 0.12), 0 4px 6px -2px rgba(15, 36, 56, 0.05);
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    }

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

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

    body {
      font-family: var(--font-family);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    .top-bar {
      background: #08101a;
      color: #94a3b8;
      font-size: 13px;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .site-logo {
      font-size: 22px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .site-logo-tag {
      background: var(--highlight);
      color: #fff;
      font-size: 11px;
      padding: 2px 6px;
      border-radius: var(--radius-sm);
      text-transform: uppercase;
      font-weight: 600;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: #334155;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-links a.active {
      color: var(--highlight);
      font-weight: 600;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      border: 1px solid transparent;
      cursor: pointer;
      transition: all 0.2s ease;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--highlight);
      color: #FFFFFF;
    }
    .btn-primary:hover {
      background: var(--highlight-hover);
      box-shadow: 0 4px 12px rgba(234, 88, 12, 0.25);
    }
    .btn-outline {
      border-color: var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: #FFFFFF;
    }
    .btn-outline-white {
      border-color: rgba(255, 255, 255, 0.4);
      color: #FFFFFF;
      background: transparent;
    }
    .btn-outline-white:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: #FFFFFF;
    }

    /* Section 通用基础 */
    .section-py {
      padding: 72px 0;
    }
    .section-dark {
      background-color: var(--primary-dark);
      color: #FFFFFF;
    }
    .section-white {
      background-color: var(--bg-white);
    }
    .section-gray {
      background-color: var(--bg-light);
    }
    .section-header {
      margin-bottom: 40px;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      color: var(--highlight);
      letter-spacing: 1px;
      margin-bottom: 8px;
    }
    .section-dark .section-tag {
      color: #fb923c;
    }
    .section-title {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.3;
      margin-bottom: 12px;
    }
    .section-dark .section-title {
      color: #FFFFFF;
    }
    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
      max-width: 820px;
    }
    .section-dark .section-desc {
      color: #94a3b8;
    }

    /* [Block 1] Hero - 前后对比首屏 */
    .hero-section {
      background: linear-gradient(rgba(11, 19, 32, 0.88), rgba(15, 36, 56, 0.94)), url('/assets/images/5cfb9029563aff28.webp') center/cover no-repeat;
      color: #FFFFFF;
      padding: 80px 0 90px;
      border-bottom: 2px solid #1e293b;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 38px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }
    .hero-lead {
      font-size: 16px;
      line-height: 1.8;
      color: #cbd5e1;
      margin-bottom: 28px;
    }
    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 32px;
    }
    .hero-stats-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      border-top: 1px solid rgba(255, 255, 255, 0.15);
      padding-top: 20px;
    }
    .hero-stat-num {
      font-size: 24px;
      font-weight: 800;
      color: #fb923c;
    }
    .hero-stat-label {
      font-size: 13px;
      color: #94a3b8;
    }

    /* 对比卡片组件 (Hero 右侧) */
    .comparison-card-hero {
      background: rgba(15, 23, 42, 0.8);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    }
    .comparison-header {
      padding: 16px 20px;
      background: rgba(255, 255, 255, 0.05);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      font-weight: 700;
      font-size: 15px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .comparison-body {
      display: grid;
      grid-template-columns: 1fr 1fr;
      divide-x: 1px solid rgba(255, 255, 255, 0.1);
    }
    .comp-col {
      padding: 24px;
    }
    .comp-col.before {
      background: rgba(239, 68, 68, 0.04);
      border-right: 1px solid rgba(255, 255, 255, 0.08);
    }
    .comp-col.after {
      background: rgba(34, 197, 94, 0.06);
    }
    .comp-col-title {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .comp-col.before .comp-col-title { color: #f87171; }
    .comp-col.after .comp-col-title { color: #4ade80; }
    .comp-list {
      list-style: none;
      font-size: 13.5px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      color: #cbd5e1;
    }
    .comp-list li {
      position: relative;
      padding-left: 18px;
    }
    .comp-list li::before {
      content: "•";
      position: absolute;
      left: 0;
      font-weight: bold;
    }
    .comp-col.before .comp-list li::before { color: #f87171; }
    .comp-col.after .comp-list li::before { color: #4ade80; }

    /* [Block 2 & 3] 双栏架构：左资讯流 + 右热榜 */
    .stream-rank-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 36px;
    }
    .news-stream-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      margin-bottom: 18px;
      display: flex;
      gap: 20px;
      transition: all 0.2s ease;
    }
    .news-stream-card:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }
    .news-stream-img {
      width: 160px;
      height: 110px;
      border-radius: var(--radius-sm);
      object-fit: cover;
      flex-shrink: 0;
    }
    .news-stream-content {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .news-stream-meta {
      font-size: 12px;
      color: var(--text-muted);
      display: flex;
      gap: 12px;
      margin-bottom: 6px;
    }
    .news-stream-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.4;
      margin-bottom: 6px;
    }
    .news-stream-desc {
      font-size: 13.5px;
      color: #475569;
      line-height: 1.6;
    }

    /* 右侧热榜 */
    .rank-card-box {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: sticky;
      top: 90px;
    }
    .rank-title {
      font-size: 17px;
      font-weight: 800;
      color: var(--primary);
      padding-bottom: 14px;
      border-bottom: 2px solid var(--bg-light);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .rank-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .rank-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
    }
    .rank-num {
      width: 22px;
      height: 22px;
      border-radius: 4px;
      background: #e2e8f0;
      color: #475569;
      font-size: 12px;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }
    .rank-item:nth-child(1) .rank-num { background: #ea580c; color: #fff; }
    .rank-item:nth-child(2) .rank-num { background: #f97316; color: #fff; }
    .rank-item:nth-child(3) .rank-num { background: #fb923c; color: #fff; }
    .rank-info-title {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      line-height: 1.4;
    }
    .rank-info-meta {
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 2px;
    }

    /* [Block 4] 专题条 / 重点机型矩阵 */
    .product-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .product-spec-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: all 0.25s ease;
    }
    .product-spec-card:hover {
      box-shadow: var(--shadow-lg);
      border-color: var(--highlight);
      transform: translateY(-4px);
    }
    .product-img-box {
      height: 200px;
      overflow: hidden;
      position: relative;
    }
    .product-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .product-spec-card:hover .product-img-box img {
      transform: scale(1.05);
    }
    .product-badge {
      position: absolute;
      top: 12px;
      left: 12px;
      background: rgba(15, 36, 56, 0.85);
      color: #fff;
      font-size: 11px;
      font-weight: 600;
      padding: 3px 8px;
      border-radius: var(--radius-sm);
    }
    .product-card-body {
      padding: 22px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .product-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .product-summary {
      font-size: 13.5px;
      color: var(--text-muted);
      margin-bottom: 18px;
      line-height: 1.6;
    }
    .specs-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-bottom: 20px;
    }
    .spec-tag {
      background: #f1f5f9;
      color: #334155;
      font-size: 12px;
      padding: 4px 8px;
      border-radius: var(--radius-sm);
      border: 1px solid #e2e8f0;
    }
    .product-cta-btn {
      margin-top: auto;
      width: 100%;
      text-align: center;
    }

    /* [Block 5] 硬核技术架构 (深色) */
    .tech-grid-2 {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
    }
    .tech-feature-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .tech-feature-item {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-md);
      padding: 20px;
    }
    .tech-feature-title {
      font-size: 16px;
      font-weight: 700;
      color: #f8fafc;
      margin-bottom: 6px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .tech-feature-title span {
      color: #fb923c;
    }
    .tech-feature-desc {
      font-size: 13.5px;
      color: #94a3b8;
      line-height: 1.65;
    }

    /* [Block 6] 效能数据统计条 */
    .data-stats-bar {
      background: #0f1f30;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      padding: 40px 0;
      color: #fff;
    }
    .data-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .data-card-item {
      padding: 10px;
    }
    .data-val {
      font-size: 36px;
      font-weight: 800;
      color: #fb923c;
      font-family: monospace, sans-serif;
      margin-bottom: 4px;
    }
    .data-name {
      font-size: 14px;
      color: #cbd5e1;
      font-weight: 600;
    }
    .data-sub {
      font-size: 12px;
      color: #64748b;
      margin-top: 2px;
    }

    /* [Block 7] 核心优势 6卡片 */
    .adv-grid-6 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      transition: all 0.2s ease;
    }
    .adv-card:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--accent);
    }
    .adv-icon-badge {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: #eff6ff;
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .adv-card-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .adv-card-desc {
      font-size: 13.5px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* [Block 8] 场景演示与工程实测 */
    .scene-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .scene-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .scene-img-box {
      height: 180px;
      object-fit: cover;
      width: 100%;
    }
    .scene-body {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .scene-tag {
      font-size: 12px;
      color: var(--accent);
      font-weight: 700;
      margin-bottom: 6px;
    }
    .scene-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .scene-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 14px;
    }
    .scene-foot-meta {
      margin-top: auto;
      padding-top: 12px;
      border-top: 1px solid #f1f5f9;
      font-size: 12px;
      color: #475569;
      display: flex;
      justify-content: space-between;
    }

    /* [Block 9] 用户口碑与工程评价 */
    .testimonial-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testi-quote {
      font-size: 14px;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 18px;
      position: relative;
    }
    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }
    .author-avatar-char {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: #e0f2fe;
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
    }
    .author-info-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--primary);
    }
    .author-info-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* [Block 10] 媒体合作与行业生态伙伴 */
    .partner-grid-6 {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 16px;
    }
    .partner-item-box {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 16px 12px;
      text-align: center;
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 60px;
    }

    /* [Block 11] 常见异议与施工准入 FAQ */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 22px;
      font-size: 15px;
      font-weight: 700;
      color: var(--primary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }
    .faq-question:hover {
      background: #f8fafc;
    }
    .faq-arrow {
      font-size: 16px;
      transition: transform 0.2s ease;
      color: var(--text-muted);
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
      color: var(--highlight);
    }
    .faq-answer {
      display: none;
      padding: 0 22px 20px;
      font-size: 14px;
      color: #475569;
      line-height: 1.7;
      border-top: 1px solid #f1f5f9;
      background: #fafafa;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* [Block 12] 保障条与权益承诺 */
    .warranty-strip {
      background: #0b1320;
      color: #fff;
      padding: 30px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    .warranty-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .warranty-item {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .warranty-icon {
      font-size: 24px;
      color: #fb923c;
      background: rgba(255, 255, 255, 0.06);
      width: 46px;
      height: 46px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      flex-shrink: 0;
    }
    .warranty-title {
      font-size: 14px;
      font-weight: 700;
      color: #f8fafc;
    }
    .warranty-desc {
      font-size: 12px;
      color: #94a3b8;
    }

    /* 底部固定转化条 (Sticky Bottom Bar) */
    .sticky-bottom-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      z-index: 90;
      background: rgba(15, 36, 56, 0.95);
      backdrop-filter: blur(10px);
      border-top: 1px solid rgba(255, 255, 255, 0.15);
      padding: 12px 0;
      color: #fff;
      box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.2);
    }
    .sticky-bar-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .sticky-text-title {
      font-size: 15px;
      font-weight: 700;
    }
    .sticky-text-sub {
      font-size: 12px;
      color: #cbd5e1;
    }

    /* 全局页脚 */
    .site-footer {
      background: #070d17;
      color: #94a3b8;
      font-size: 13.5px;
      padding: 60px 0 80px; /* 留出底部悬浮条空隙 */
      border-top: 1px solid #1e293b;
    }
    .footer-grid-4 {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-size: 20px;
      font-weight: 800;
      color: #ffffff;
      margin-bottom: 14px;
    }
    .footer-desc {
      font-size: 13px;
      line-height: 1.7;
      color: #64748b;
    }
    .footer-title {
      font-size: 15px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      color: #94a3b8;
    }
    .footer-links a:hover {
      color: #fb923c;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
    }

    /* 移动端菜单与断点适配 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 22px;
      cursor: pointer;
      color: var(--primary);
    }

    @media (max-width: 1024px) {
      .hero-grid, .stream-rank-grid, .tech-grid-2, .product-grid-3, .adv-grid-6, .scene-grid-3, .testimonial-grid-3 {
        grid-template-columns: 1fr;
      }
      .footer-grid-4 {
        grid-template-columns: 1fr 1fr;
      }
      .data-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .partner-grid-6 {
        grid-template-columns: repeat(3, 1fr);
      }
      .warranty-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-h1 {
        font-size: 30px;
      }
    }

    @media (max-width: 640px) {
      .top-bar { display: none; }
      .data-grid-4 { grid-template-columns: 1fr; }
      .footer-grid-4 { grid-template-columns: 1fr; }
      .partner-grid-6 { grid-template-columns: repeat(2, 1fr); }
      .warranty-grid-4 { grid-template-columns: 1fr; }
      .news-stream-card { flex-direction: column; }
      .news-stream-img { width: 100%; height: 160px; }
      .sticky-text-sub { display: none; }
      .comparison-body { grid-template-columns: 1fr; }
      .comp-col.before { border-right: none; border-bottom: 1px solid rgba(255, 255, 255, 0.08); }
    }