:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --secondary: #06b6d4;
      --accent: #f59e0b;
      --accent-pink: #ec4899;
      --accent-purple: #8b5cf6;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
      --shadow-xl: 0 20px 25px -5px rgba(79, 70, 229, 0.15), 0 10px 10px -5px rgba(6, 182, 212, 0.1);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-full: 9999px;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

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

    /* 容器规范：整站唯一居中宽度约束 */
    .container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }

    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: #1e1b4b;
      letter-spacing: -0.5px;
      display: flex;
      flex-direction: column;
      line-height: 1.2;
    }

    .brand-tagline {
      font-size: 0.72rem;
      font-weight: 600;
      color: var(--primary);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
    }

    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links li a {
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: rgba(79, 70, 229, 0.08);
    }

    .nav-action {
      margin-left: 16px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      color: var(--text-main);
    }

    .mobile-menu-btn svg {
      width: 24px;
      height: 24px;
      fill: currentColor;
    }

    /* 艳彩高饱和基础色彩系统 */
    .badge-vibrant {
      display: inline-flex;
      align-items: center;
      padding: 4px 12px;
      font-size: 0.8rem;
      font-weight: 700;
      border-radius: var(--radius-full);
      background: linear-gradient(135deg, #f43f5e 0%, #fb923c 100%);
      color: #ffffff;
      box-shadow: 0 4px 10px rgba(244, 63, 94, 0.3);
    }

    .btn-vibrant-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 1rem;
      font-weight: 700;
      border-radius: var(--radius-full);
      background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
      color: #ffffff !important;
      border: none;
      cursor: pointer;
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.35);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .btn-vibrant-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(79, 70, 229, 0.45);
      background: linear-gradient(135deg, #4338ca 0%, #0891b2 100%);
    }

    .btn-vibrant-coral {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 1rem;
      font-weight: 700;
      border-radius: var(--radius-full);
      background: linear-gradient(135deg, #f97316 0%, #ec4899 100%);
      color: #ffffff !important;
      border: none;
      cursor: pointer;
      box-shadow: 0 6px 20px rgba(249, 115, 22, 0.35);
      transition: all 0.3s ease;
    }

    .btn-vibrant-coral:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(236, 72, 153, 0.45);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 11px 24px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-full);
      border: 2px solid var(--primary);
      color: var(--primary) !important;
      background: #ffffff;
      transition: all 0.25s ease;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: #ffffff !important;
      transform: translateY(-2px);
    }

    /* 首屏 Hero - 无图片，纯CSS与科技卡片 */
    .hero-section {
      position: relative;
      padding: 64px 0 72px 0;
      background: radial-gradient(circle at 80% 20%, rgba(244, 63, 94, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 20% 80%, rgba(6, 182, 212, 0.12) 0%, transparent 45%),
                  linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
    }

    .hero-title {
      font-size: 2.5rem;
      line-height: 1.2;
      font-weight: 900;
      color: #0f172a;
      margin: 18px 0 16px 0;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: #334155;
      margin-bottom: 24px;
      font-weight: 500;
    }

    .hero-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 28px;
    }

    .tag-item {
      background: #eff6ff;
      border: 1px solid #bfdbfe;
      color: #1d4ed8;
      font-size: 0.82rem;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 32px;
    }

    .hero-stats-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      width: 100%;
      padding-top: 24px;
      border-top: 1px solid var(--border-color);
    }

    .stat-item {
      display: flex;
      flex-direction: column;
    }

    .stat-num {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary);
    }

    .stat-label {
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* 首屏纯CSS科技数据视窗 */
    .hero-preview-board {
      background: #ffffff;
      border: 2px solid #e0e7ff;
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-xl);
      position: relative;
    }

    .board-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 16px;
      border-bottom: 1px solid #f1f5f9;
      margin-bottom: 16px;
    }

    .board-dots {
      display: flex;
      gap: 6px;
    }

    .dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }
    .dot-red { background: #ef4444; }
    .dot-yellow { background: #f59e0b; }
    .dot-green { background: #10b981; }

    .board-status {
      font-size: 0.75rem;
      font-weight: 700;
      color: #059669;
      background: #d1fae5;
      padding: 2px 8px;
      border-radius: var(--radius-full);
    }

    .board-chips-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-bottom: 16px;
    }

    .chip-block {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 12px;
    }

    .chip-title {
      font-size: 0.85rem;
      font-weight: 700;
      color: #1e293b;
      margin-bottom: 4px;
    }

    .chip-desc {
      font-size: 0.75rem;
      color: var(--text-light);
    }

    .model-ticker {
      background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
      border-radius: var(--radius-md);
      padding: 14px;
      color: #ffffff;
    }

    .ticker-head {
      font-size: 0.78rem;
      color: #a5b4fc;
      margin-bottom: 8px;
      font-weight: 600;
    }

    .ticker-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .m-pill {
      font-size: 0.72rem;
      background: rgba(255, 255, 255, 0.15);
      color: #f1f5f9;
      padding: 2px 8px;
      border-radius: 4px;
    }

    /* 通用分节规范 */
    .section-wrap {
      padding: 64px 0;
      border-bottom: 1px solid var(--border-color);
      background-color: #ffffff;
    }

    .section-wrap:nth-of-type(even) {
      background-color: #f8fafc;
    }

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px auto;
    }

    .section-eyebrow {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: #4f46e5;
      background: #ede9fe;
      padding: 4px 14px;
      border-radius: var(--radius-full);
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: #0f172a;
      line-height: 1.3;
      margin-bottom: 12px;
    }

    .section-intro {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* 艳彩网格卡片 */
    .vibrant-cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-xl);
      border-color: #cbd5e1;
    }

    .card-icon-wrap {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      font-weight: 800;
      font-size: 1.25rem;
      color: #ffffff;
    }

    .bg-gradient-pink { background: linear-gradient(135deg, #ec4899 0%, #f43f5e 100%); }
    .bg-gradient-blue { background: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%); }
    .bg-gradient-indigo { background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%); }
    .bg-gradient-amber { background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%); }
    .bg-gradient-emerald { background: linear-gradient(135deg, #10b981 0%, #059669 100%); }
    .bg-gradient-violet { background: linear-gradient(135deg, #8b5cf6 0%, #6d28d9 100%); }

    .card-title {
      font-size: 1.18rem;
      font-weight: 700;
      color: #1e293b;
      margin-bottom: 10px;
    }

    .card-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      flex-grow: 1;
      line-height: 1.6;
    }

    .card-foot-tag {
      margin-top: 14px;
      font-size: 0.78rem;
      font-weight: 600;
      color: var(--primary);
    }

    /* 平台介绍两栏 */
    .platform-intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }

    .intro-box-visual {
      background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
      border: 2px dashed #818cf8;
      border-radius: var(--radius-lg);
      padding: 32px;
      text-align: center;
    }

    .highlight-capsule {
      background: #ffffff;
      padding: 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      margin-bottom: 16px;
      text-align: left;
    }

    .capsule-title {
      font-weight: 700;
      color: #1e1b4b;
      margin-bottom: 4px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .capsule-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 案例中心图文卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .case-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-3px);
    }

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #f1f5f9;
      overflow: hidden;
    }

    .case-img-wrap.square {
      aspect-ratio: 1 / 1;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.03);
    }

    .case-body {
      padding: 20px;
    }

    .case-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      color: #f97316;
      background: #fff7ed;
      padding: 2px 8px;
      border-radius: 4px;
      margin-bottom: 8px;
    }

    .case-heading {
      font-size: 1.1rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 8px;
    }

    .case-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 评测与对比板块 - 满分10分推荐9.9 */
    .review-score-hero {
      background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      margin-bottom: 32px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .score-left {
      max-width: 600px;
    }

    .score-stars {
      color: #facc15;
      font-size: 1.4rem;
      letter-spacing: 2px;
      margin-bottom: 8px;
    }

    .score-title {
      font-size: 1.6rem;
      font-weight: 800;
      margin-bottom: 8px;
      color: #ffffff;
    }

    .score-desc {
      color: #cbd5e1;
      font-size: 0.95rem;
    }

    .score-big-box {
      text-align: center;
      background: rgba(255, 255, 255, 0.1);
      padding: 20px 32px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.2);
    }

    .score-number {
      font-size: 3.2rem;
      font-weight: 900;
      color: #38bdf8;
      line-height: 1;
    }

    .score-denom {
      font-size: 1rem;
      color: #94a3b8;
      font-weight: 600;
    }

    .score-recommend {
      margin-top: 6px;
      font-size: 0.82rem;
      font-weight: 700;
      background: #22c55e;
      padding: 3px 8px;
      border-radius: 4px;
      color: #ffffff;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    .comparison-table th, 
    .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
      font-size: 0.92rem;
    }

    .comparison-table th {
      background: #f8fafc;
      font-weight: 700;
      color: #1e293b;
    }

    .comparison-table tr:hover {
      background: #f8fafc;
    }

    .col-highlight {
      background: #eef2ff !important;
      font-weight: 700;
      color: #4338ca !important;
    }

    /* 流程与步骤 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
      font-size: 1rem;
    }

    .step-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: #1e293b;
      margin-bottom: 8px;
    }

    .step-text {
      font-size: 0.86rem;
      color: var(--text-muted);
    }

    /* 6条用户评论卡片 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-quote {
      font-size: 0.94rem;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 18px;
      position: relative;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      padding-top: 14px;
      border-top: 1px solid #f1f5f9;
    }

    .user-avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #818cf8 0%, #c084fc 100%);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
      flex-shrink: 0;
    }

    .user-meta-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: #0f172a;
    }

    .user-meta-role {
      font-size: 0.78rem;
      color: var(--text-light);
    }

    /* FAQ 折叠手风琴 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.2s ease;
    }

    .faq-question {
      padding: 18px 22px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      font-size: 1.02rem;
      color: #1e293b;
      user-select: none;
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-icon {
      font-size: 1.2rem;
      font-weight: 400;
      transition: transform 0.25s ease;
      color: var(--primary);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #f8fafc;
      border-top: 0 solid var(--border-color);
    }

    .faq-item.active .faq-answer {
      border-top-width: 1px;
      max-height: 240px;
    }

    .faq-answer-inner {
      padding: 18px 22px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 需求表单与联系我们 */
    .contact-form-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
      align-items: start;
    }

    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 700;
      color: #334155;
      margin-bottom: 6px;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%;
      padding: 11px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background-color: #ffffff;
      outline: none;
      transition: border-color 0.2s ease;
      font-family: inherit;
    }

    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }

    .contact-cards-side {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .contact-card-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      box-shadow: var(--shadow-sm);
    }

    .qr-container {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .qr-img-box {
      width: 110px;
      height: 110px;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-sm);
      padding: 4px;
      background: #ffffff;
      flex-shrink: 0;
    }

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

    .qr-details h4 {
      font-size: 1rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 6px;
    }

    .qr-details p {
      font-size: 0.84rem;
      color: var(--text-muted);
      margin-bottom: 4px;
    }

    /* 行业资讯与文章 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }

    .article-snippet-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      transition: border-color 0.2s ease, transform 0.2s ease;
    }

    .article-snippet-card:hover {
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    .article-date {
      font-size: 0.78rem;
      color: var(--text-light);
      margin-bottom: 6px;
    }

    .article-link-title {
      font-size: 1.02rem;
      font-weight: 700;
      color: #1e293b;
      margin-bottom: 8px;
      line-height: 1.4;
      display: block;
    }

    .article-link-title:hover {
      color: var(--primary);
    }

    .article-excerpt {
      font-size: 0.86rem;
      color: var(--text-muted);
    }

    /* 宣传展示Banner组 */
    .promo-banners-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 32px;
    }

    .promo-banner-card {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      background: #ffffff;
    }

    /* 底部专属统一色彩：浅底深字或明晰深底 */
    .site-footer {
      background-color: #0f172a;
      color: #f8fafc;
      padding: 56px 0 24px 0;
      border-top: 1px solid #1e293b;
    }

    .footer-top-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 32px;
      padding-bottom: 40px;
      border-bottom: 1px solid #1e293b;
    }

    .footer-brand h3 {
      font-size: 1.25rem;
      font-weight: 800;
      color: #ffffff;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.88rem;
      color: #94a3b8;
      margin-bottom: 16px;
      max-width: 320px;
    }

    .footer-col h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: #f1f5f9;
      margin-bottom: 16px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links-list li a {
      font-size: 0.86rem;
      color: #94a3b8;
    }

    .footer-links-list li a:hover {
      color: #38bdf8;
    }

    .friend-links-wrap {
      padding: 24px 0;
      border-bottom: 1px solid #1e293b;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
    }

    .friend-links-title {
      font-size: 0.85rem;
      font-weight: 700;
      color: #cbd5e1;
    }

    .friend-links-wrap a {
      font-size: 0.84rem;
      color: #94a3b8;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
      transition: all 0.2s ease;
    }

    .friend-links-wrap a:hover {
      color: #ffffff;
      background: var(--primary);
    }

    .footer-bottom-bar {
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.82rem;
      color: #64748b;
    }

    /* 浮动操作栏与返回顶部 */
    .floating-bar {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }

    .float-btn svg {
      width: 20px;
      height: 20px;
      fill: currentColor;
    }

    /* 响应式媒体查询 */
    @media (max-width: 1024px) {
      .hero-grid,
      .platform-intro-grid,
      .contact-form-grid,
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
      .footer-top-grid {
        gap: 28px;
      }
      .promo-banners-row {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .header-inner {
        height: 64px;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.show {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 1.9rem;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .hero-stats-row {
        grid-template-columns: 1fr;
        gap: 12px;
      }
      .board-chips-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom-bar {
        flex-direction: column;
        align-items: flex-start;
      }
    }