/* roulang page: index */
:root {
      --color-primary: #111827;
      --color-accent: #00D084;
      --color-accent-hover: #00b371;
      --color-warning: #FF5722;
      --color-dark-bg: #0B0F19;
      --color-card-dark: #151C2C;
      --color-bg-light: #F8FAFC;
      --color-surface: #FFFFFF;
      --color-text-main: #1F2937;
      --color-text-sub: #4B5563;
      --color-text-muted: #9CA3AF;
      --color-border: #E5E7EB;
      --color-border-dark: #242E42;
      --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --radius-sm: 4px;
      --radius-md: 8px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.1);
      --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
      --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
      --container-max: 1200px;
    }

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

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

    body {
      font-family: var(--font-sans);
      background-color: var(--color-bg-light);
      color: var(--color-text-main);
      line-height: 1.68;
      -webkit-font-smoothing: antialiased;
      padding-bottom: 60px;
    }

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

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

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

    /* 顶部通知与细栏 */
    .topbar {
      background-color: #0d131f;
      color: #9CA3AF;
      font-size: 13px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 7px 0;
    }
    .topbar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 8px;
    }
    .topbar-chips {
      display: flex;
      gap: 10px;
      align-items: center;
    }
    .chip-badge {
      display: inline-flex;
      align-items: center;
      background: rgba(0, 208, 132, 0.12);
      color: var(--color-accent);
      border: 1px solid rgba(0, 208, 132, 0.3);
      padding: 2px 8px;
      border-radius: var(--radius-sm);
      font-size: 12px;
      line-height: 1.2;
    }
    .chip-badge:hover {
      background: rgba(0, 208, 132, 0.22);
    }

    /* 主导航 */
    .header-main {
      background: #FFFFFF;
      border-bottom: 1px solid var(--color-border);
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 70px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 800;
      color: var(--color-primary);
      letter-spacing: -0.5px;
    }
    .brand-icon {
      width: 34px;
      height: 34px;
      background: var(--color-primary);
      color: var(--color-accent);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 18px;
      border: 1px solid var(--color-accent);
    }
    .nav-links {
      display: flex;
      list-style: none;
      gap: 24px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--color-text-main);
      padding: 6px 0;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--color-primary);
      font-weight: 600;
    }
    .nav-links a.active::after,
    .nav-links a:hover::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--color-accent);
    }
    .header-action {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 9px 18px;
      font-size: 14px;
      cursor: pointer;
      transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
      border: 1px solid transparent;
      white-space: nowrap;
    }
    .btn:hover {
      transform: translateY(-1px);
    }
    .btn:focus {
      outline: 2px solid var(--color-accent);
      outline-offset: 2px;
    }
    .btn-accent {
      background-color: var(--color-accent);
      color: var(--color-primary);
      border-color: var(--color-accent);
    }
    .btn-accent:hover {
      background-color: var(--color-accent-hover);
    }
    .btn-outline {
      background: transparent;
      border-color: var(--color-border);
      color: var(--color-text-main);
    }
    .btn-outline:hover {
      border-color: var(--color-accent);
      color: var(--color-primary);
      background-color: rgba(0, 208, 132, 0.04);
    }
    .btn-dark {
      background: var(--color-primary);
      color: #FFFFFF;
      border-color: var(--color-primary);
    }
    .btn-dark:hover {
      background: #1f2937;
    }
    .btn-warning {
      background: var(--color-warning);
      color: #FFFFFF;
      border-color: var(--color-warning);
    }
    .btn-warning:hover {
      background: #e64a19;
    }

    /* 移动端菜单控制 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--color-primary);
    }

    /* 通用Section规则 */
    section {
      padding: 88px 0;
      position: relative;
    }
    .section-header {
      margin-bottom: 48px;
      max-width: 800px;
    }
    .section-header.center {
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      color: var(--color-accent);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 32px;
      line-height: 1.3;
      font-weight: 800;
      color: var(--color-primary);
      letter-spacing: -0.5px;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--color-text-sub);
      line-height: 1.7;
    }

    /* Section 1: Hero Banner（对比选型前置 + 立即开通） */
    #hero {
      background: linear-gradient(180deg, #0B0F19 0%, #111827 100%);
      color: #FFFFFF;
      padding: 70px 0 90px;
      position: relative;
      overflow: hidden;
    }
    #hero::before {
      content: "";
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background-image: url('/assets/images/f164dab25dfa3b6b.png');
      background-size: cover;
      background-position: center;
      opacity: 0.12;
      pointer-events: none;
    }
    .hero-layout {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 800;
      letter-spacing: -0.8px;
      color: #FFFFFF;
      margin-bottom: 20px;
    }
    .hero-h1 span {
      color: var(--color-accent);
    }
    .hero-lead {
      font-size: 16px;
      line-height: 1.75;
      color: #D1D5DB;
      margin-bottom: 30px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 32px;
    }
    .hero-stats-row {
      display: flex;
      gap: 28px;
      border-top: 1px solid rgba(255, 255, 255, 0.12);
      padding-top: 24px;
    }
    .hero-stat-item h4 {
      font-size: 26px;
      font-weight: 800;
      color: var(--color-accent);
      font-family: monospace;
    }
    .hero-stat-item p {
      font-size: 13px;
      color: #9CA3AF;
      margin-top: 2px;
    }

    /* 首屏选型卡片（推荐档微升前置） */
    .hero-card-compare {
      background: #151C2C;
      border: 2px solid var(--color-accent);
      border-radius: var(--radius-md);
      padding: 30px;
      position: relative;
      box-shadow: 0 20px 30px rgba(0,0,0,0.4);
    }
    .hero-card-badge {
      position: absolute;
      top: -14px;
      right: 24px;
      background: var(--color-accent);
      color: var(--color-primary);
      font-size: 12px;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: var(--radius-sm);
    }
    .hero-card-header {
      margin-bottom: 20px;
      border-bottom: 1px solid var(--color-border-dark);
      padding-bottom: 16px;
    }
    .hero-card-title {
      font-size: 20px;
      font-weight: 700;
      color: #FFFFFF;
    }
    .hero-card-subtitle {
      font-size: 13px;
      color: var(--color-text-muted);
      margin-top: 4px;
    }
    .hero-card-checklist {
      list-style: none;
      margin-bottom: 24px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .hero-card-checklist li {
      font-size: 14px;
      color: #E5E7EB;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .hero-card-checklist li svg {
      width: 16px;
      height: 16px;
      fill: var(--color-accent);
      flex-shrink: 0;
    }

    /* Section 2: 系统架构与核心技术底座 */
    #architecture {
      background: #FFFFFF;
      border-bottom: 1px solid var(--color-border);
    }
    .arch-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .arch-image-wrap {
      background: #0B0F19;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--color-border);
      position: relative;
    }
    .arch-points {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .arch-point-box {
      border-left: 3px solid var(--color-accent);
      padding-left: 18px;
    }
    .arch-point-box h4 {
      font-size: 18px;
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 6px;
    }
    .arch-point-box p {
      font-size: 14px;
      color: var(--color-text-sub);
      line-height: 1.65;
    }
    .arch-metric-tag {
      display: inline-block;
      margin-top: 8px;
      font-size: 12px;
      font-weight: 600;
      background: #EEF2F6;
      color: #1F2937;
      padding: 3px 8px;
      border-radius: var(--radius-sm);
    }

    /* Section 3: 核心功能与应用矩阵 (6卡片网格) */
    #features {
      background: var(--color-bg-light);
    }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .feature-card:hover {
      transform: translateY(-3px);
      border-color: var(--color-accent);
      box-shadow: var(--shadow-md);
    }
    .feature-icon-bar {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: rgba(0, 208, 132, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--color-primary);
      font-weight: 800;
      font-size: 20px;
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 19px;
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 12px;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--color-text-sub);
      line-height: 1.65;
      margin-bottom: 20px;
    }
    .feature-tag-row {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
    }
    .feature-tag-row span {
      font-size: 12px;
      color: #4B5563;
      background: #F3F4F6;
      padding: 2px 7px;
      border-radius: var(--radius-sm);
    }

    /* Section 4: 套件版本 (3联卡片) */
    #products {
      background: #FFFFFF;
      border-top: 1px solid var(--color-border);
      border-bottom: 1px solid var(--color-border);
    }
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: stretch;
    }
    .product-card {
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .product-card.featured {
      border: 2px solid var(--color-accent);
      background: #FAFDFB;
      transform: translateY(-8px);
      box-shadow: var(--shadow-lg);
    }
    .product-badge-top {
      position: absolute;
      top: -13px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--color-accent);
      color: var(--color-primary);
      font-size: 12px;
      font-weight: 700;
      padding: 3px 14px;
      border-radius: var(--radius-sm);
    }
    .product-card-title {
      font-size: 20px;
      font-weight: 800;
      color: var(--color-primary);
    }
    .product-target {
      font-size: 13px;
      color: var(--color-text-sub);
      margin-top: 4px;
      margin-bottom: 20px;
      min-height: 38px;
    }
    .product-specs {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-bottom: 30px;
      flex-grow: 1;
    }
    .product-specs li {
      font-size: 14px;
      color: var(--color-text-main);
      display: flex;
      align-items: flex-start;
      gap: 8px;
    }
    .product-specs li::before {
      content: "✓";
      color: var(--color-accent);
      font-weight: 900;
    }

    /* Section 5: 全场景业务落地演示 (三步推演与Tab) */
    #scenarios {
      background: var(--color-bg-light);
    }
    .scenario-tabs {
      display: flex;
      gap: 12px;
      justify-content: center;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }
    .scenario-tab-btn {
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      padding: 10px 22px;
      font-size: 15px;
      font-weight: 600;
      color: var(--color-text-sub);
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all 0.2s;
    }
    .scenario-tab-btn.active {
      background: var(--color-primary);
      color: #FFFFFF;
      border-color: var(--color-primary);
    }
    .scenario-content {
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 36px;
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
      align-items: center;
    }
    .scenario-steps {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .scenario-step-item {
      display: flex;
      gap: 16px;
    }
    .step-num {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--color-accent);
      color: var(--color-primary);
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      font-size: 14px;
    }
    .step-text h5 {
      font-size: 16px;
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 4px;
    }
    .step-text p {
      font-size: 14px;
      color: var(--color-text-sub);
    }

    /* Section 6: 技术理念与自研算法架构 (深色高对比) */
    #technology {
      background: var(--color-dark-bg);
      color: #FFFFFF;
    }
    .tech-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .tech-card {
      background: var(--color-card-dark);
      border: 1px solid var(--color-border-dark);
      border-radius: var(--radius-md);
      padding: 24px;
    }
    .tech-card h4 {
      font-size: 18px;
      font-weight: 700;
      color: var(--color-accent);
      margin-bottom: 10px;
    }
    .tech-card p {
      font-size: 13.5px;
      color: #9CA3AF;
      line-height: 1.65;
    }

    /* Section 7: 标杆案例 */
    #cases {
      background: #FFFFFF;
      border-top: 1px solid var(--color-border);
    }
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .case-card {
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      background: var(--color-bg-light);
    }
    .case-card img {
      width: 100%;
      height: 220px;
      object-fit: cover;
    }
    .case-body {
      padding: 26px;
    }
    .case-tag {
      font-size: 12px;
      font-weight: 700;
      color: var(--color-accent);
      margin-bottom: 8px;
    }
    .case-body h4 {
      font-size: 19px;
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 10px;
    }
    .case-body p {
      font-size: 14px;
      color: var(--color-text-sub);
      margin-bottom: 18px;
    }
    .case-stats-row {
      display: flex;
      gap: 20px;
      border-top: 1px solid var(--color-border);
      padding-top: 14px;
    }
    .case-stat-val {
      font-size: 20px;
      font-weight: 800;
      color: var(--color-primary);
    }
    .case-stat-label {
      font-size: 12px;
      color: var(--color-text-muted);
    }

    /* Section 8: 机构实证与运营故事 */
    #stories {
      background: #F1F5F9;
    }
    .story-box {
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 40px;
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 36px;
      align-items: center;
    }
    .story-quote {
      font-size: 17px;
      line-height: 1.75;
      color: var(--color-primary);
      font-weight: 500;
      margin-bottom: 24px;
      position: relative;
    }
    .story-author {
      font-size: 15px;
      font-weight: 700;
      color: var(--color-primary);
    }
    .story-role {
      font-size: 13px;
      color: var(--color-text-muted);
    }

    /* Section 9: 核心量化效能监测条 */
    #metrics {
      background: var(--color-primary);
      color: #FFFFFF;
      padding: 60px 0;
    }
    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-number {
      font-size: 40px;
      font-weight: 900;
      color: var(--color-accent);
      font-family: monospace;
      line-height: 1.1;
      margin-bottom: 8px;
    }
    .metric-label {
      font-size: 14px;
      color: #D1D5DB;
      letter-spacing: 0.5px;
    }

    /* Section 10: 对比差异表 */
    #comparison {
      background: #FFFFFF;
    }
    .compare-table-wrap {
      overflow-x: auto;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      background: #FFFFFF;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      font-size: 14px;
      border-bottom: 1px solid var(--color-border);
    }
    .compare-table th {
      background: #F8FAFC;
      font-weight: 700;
      color: var(--color-primary);
    }
    .compare-table th.highlight,
    .compare-table td.highlight {
      background: rgba(0, 208, 132, 0.05);
      border-left: 2px solid var(--color-accent);
      border-right: 2px solid var(--color-accent);
      color: var(--color-primary);
      font-weight: 600;
    }

    /* Section 11: 权威机构实测评价 (社会认同) */
    #testimonials {
      background: var(--color-bg-light);
    }
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testi-card {
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 26px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testi-stars {
      color: #F59E0B;
      font-size: 15px;
      margin-bottom: 12px;
    }
    .testi-card p {
      font-size: 14px;
      color: var(--color-text-sub);
      line-height: 1.7;
      margin-bottom: 18px;
    }
    .testi-meta {
      border-top: 1px solid var(--color-border);
      padding-top: 12px;
      font-size: 13px;
    }
    .testi-meta strong {
      color: var(--color-primary);
      display: block;
    }
    .testi-meta span {
      color: var(--color-text-muted);
    }

    /* Section 12: 行业动态与算法演进日志 (资讯摘要卡) */
    #news {
      background: #FFFFFF;
    }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: all 0.2s;
    }
    .news-card:hover {
      border-color: var(--color-accent);
      box-shadow: var(--shadow-sm);
    }
    .news-date {
      font-size: 12px;
      color: var(--color-text-muted);
      margin-bottom: 8px;
    }
    .news-card h4 {
      font-size: 17px;
      font-weight: 700;
      color: var(--color-primary);
      line-height: 1.4;
      margin-bottom: 10px;
    }
    .news-card p {
      font-size: 13.5px;
      color: var(--color-text-sub);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .news-link {
      font-size: 13px;
      font-weight: 700;
      color: var(--color-accent);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* Section 13: 异议拆解 (FAQ 手风琴) */
    #faq {
      background: var(--color-bg-light);
    }
    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    details.faq-item {
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      overflow: hidden;
    }
    details.faq-item[open] {
      border-color: var(--color-accent);
    }
    summary.faq-question {
      padding: 18px 22px;
      font-size: 16px;
      font-weight: 700;
      color: var(--color-primary);
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    summary.faq-question::-webkit-details-marker {
      display: none;
    }
    summary.faq-question::after {
      content: "+";
      font-size: 20px;
      font-weight: 400;
      color: var(--color-text-muted);
      transition: transform 0.2s;
    }
    details.faq-item[open] summary.faq-question::after {
      content: "−";
      color: var(--color-accent);
    }
    .faq-answer {
      padding: 0 22px 18px 22px;
      font-size: 14.5px;
      color: var(--color-text-sub);
      line-height: 1.7;
      border-top: 1px solid rgba(0,0,0,0.03);
    }

    /* Section 14: 系统部署服务保障 (保障条) */
    #guarantee {
      background: #FFFFFF;
      border-top: 1px solid var(--color-border);
      border-bottom: 1px solid var(--color-border);
      padding: 50px 0;
    }
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .guarantee-box {
      text-align: center;
      padding: 10px;
    }
    .guarantee-icon {
      font-size: 28px;
      color: var(--color-accent);
      margin-bottom: 10px;
    }
    .guarantee-box h5 {
      font-size: 16px;
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 6px;
    }
    .guarantee-box p {
      font-size: 13px;
      color: var(--color-text-sub);
    }

    /* Section 15: 底部主 CTA 表单 */
    #contact {
      background: linear-gradient(180deg, #111827 0%, #0B0F19 100%);
      color: #FFFFFF;
      padding: 80px 0;
    }
    .contact-card-wrap {
      max-width: 760px;
      margin: 0 auto;
      background: #151C2C;
      border: 1px solid var(--color-border-dark);
      border-radius: var(--radius-md);
      padding: 40px;
    }
    .contact-header {
      text-align: center;
      margin-bottom: 30px;
    }
    .contact-header h3 {
      font-size: 26px;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 8px;
    }
    .contact-header p {
      font-size: 14px;
      color: #9CA3AF;
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
      margin-bottom: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group.full {
      grid-column: span 2;
    }
    .form-group label {
      font-size: 13px;
      font-weight: 600;
      color: #D1D5DB;
    }
    .form-group input,
    .form-group select,
    .form-group textarea {
      background: #0B0F19;
      border: 1px solid var(--color-border-dark);
      border-radius: var(--radius-sm);
      padding: 10px 14px;
      color: #FFFFFF;
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s;
    }
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--color-accent);
    }

    /* 底部固定条 */
    .sticky-bottom-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      height: 60px;
      background: rgba(17, 24, 39, 0.96);
      backdrop-filter: blur(8px);
      border-top: 1px solid var(--color-border-dark);
      z-index: 99;
      display: flex;
      align-items: center;
    }
    .sticky-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .sticky-info {
      display: flex;
      align-items: center;
      gap: 16px;
      color: #FFFFFF;
      font-size: 14px;
    }
    .sticky-info .tag {
      background: rgba(0, 208, 132, 0.15);
      color: var(--color-accent);
      padding: 2px 8px;
      border-radius: var(--radius-sm);
      font-size: 12px;
      font-weight: 700;
    }

    /* 页脚 */
    footer {
      background: #080C14;
      color: #9CA3AF;
      border-top: 1px solid #1A2233;
      padding: 60px 0 24px;
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 36px;
      margin-bottom: 48px;
    }
    .footer-col h5 {
      color: #FFFFFF;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 9px;
    }
    .footer-links a:hover {
      color: var(--color-accent);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 13px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-layout {
        grid-template-columns: 1fr;
      }
      .arch-grid {
        grid-template-columns: 1fr;
      }
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .product-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .product-card.featured {
        transform: none;
      }
      .tech-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      body {
        padding-bottom: 56px;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
      }
      .header-action {
        display: none;
      }
      .hero-h1 {
        font-size: 30px;
      }
      .section-title {
        font-size: 26px;
      }
      .features-grid,
      .product-grid,
      .cases-grid,
      .tech-grid,
      .testimonials-grid,
      .news-grid,
      .guarantee-grid {
        grid-template-columns: 1fr;
      }
      .scenario-content {
        grid-template-columns: 1fr;
      }
      .story-box {
        grid-template-columns: 1fr;
      }
      .metrics-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .sticky-bottom-bar {
        height: 56px;
      }
      .sticky-info {
        font-size: 13px;
      }
      .sticky-info span:not(.tag) {
        display: none;
      }
    }