:root {
      --primary: #0d9488;
      --primary-light: #14b8a6;
      --primary-dark: #0f766e;
      --accent: #06b6d4;
      --accent-dark: #0891b2;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --bg-subtle: #f0fdfa;
      --border-color: #ccfbf1;
      --border-subtle: #e2e8f0;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 4px 16px -2px rgba(13, 148, 136, 0.08), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 12px 30px -4px rgba(13, 148, 136, 0.12), 0 4px 12px -2px rgba(0, 0, 0, 0.05);
      --radius: 12px;
    }

    * {
      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", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      background-image: radial-gradient(#ccfbf1 1px, transparent 1px), radial-gradient(#e0f2fe 1px, var(--bg-page) 1px);
      background-size: 40px 40px;
      background-position: 0 0, 20px 20px;
    }

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

    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }

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

    .nav-links li a,
    .nav-links li .ai-page-home-link {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s ease, background-color 0.2s ease;
      border-radius: 6px;
    }

    .nav-links li a:hover,
    .nav-links li .ai-page-home-link:hover {
      color: var(--primary);
      background-color: var(--bg-subtle);
    }

    .header-cta-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 8px;
      text-decoration: none;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      line-height: 1.2;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent-dark) 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(13, 148, 136, 0.28);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(13, 148, 136, 0.35);
      color: #ffffff;
    }

    .btn-outline {
      background-color: #ffffff;
      color: var(--primary-dark);
      border-color: var(--primary-light);
    }

    .btn-outline:hover {
      background-color: var(--bg-subtle);
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1px solid var(--border-subtle);
      padding: 8px 12px;
      border-radius: 6px;
      font-size: 1.2rem;
      cursor: pointer;
      color: var(--text-main);
    }

    /* Section Foundations */
    section {
      padding: 70px 0;
      position: relative;
    }

    .section-head {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }

    .section-badge {
      display: inline-block;
      padding: 5px 14px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary-dark);
      background-color: var(--bg-subtle);
      border: 1px solid var(--border-color);
      border-radius: 30px;
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Hero Section (No Images Allowed) */
    .hero-section {
      padding: 80px 0 90px 0;
      background: linear-gradient(180deg, rgba(204, 251, 241, 0.5) 0%, rgba(240, 253, 250, 0.2) 60%, var(--bg-page) 100%);
      text-align: center;
    }

    .hero-inner {
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-badge-wrap {
      margin-bottom: 24px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 20px;
      background: #ffffff;
      border: 1px solid #99f6e4;
      border-radius: 50px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--primary-dark);
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 22px;
      letter-spacing: -1px;
    }

    .hero-title span {
      background: linear-gradient(135deg, var(--primary-dark) 0%, var(--accent-dark) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: var(--primary-dark);
    }

    .hero-subtext {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px auto;
      line-height: 1.8;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .btn-hero-official {
      padding: 14px 34px;
      font-size: 1.1rem;
      font-weight: 700;
      background: linear-gradient(135deg, #0f766e 0%, #0d9488 50%, #0891b2 100%);
      color: #ffffff;
      border-radius: 10px;
      box-shadow: 0 8px 25px rgba(13, 148, 136, 0.35);
      border: none;
    }

    .btn-hero-official:hover {
      background: linear-gradient(135deg, #115e59 0%, #0f766e 100%);
      color: #ffffff;
      transform: translateY(-2px);
      box-shadow: 0 12px 30px rgba(13, 148, 136, 0.45);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 20px;
    }

    .stat-card {
      background: #ffffff;
      padding: 22px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-light);
    }

    .stat-number {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-light);
      font-weight: 500;
    }

    /* Grid Layouts */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    /* Cards Component */
    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      border-color: var(--border-color);
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--bg-subtle);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      color: var(--primary);
      margin-bottom: 18px;
      font-weight: bold;
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }

    .card-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 16px;
    }

    .tag-item {
      font-size: 0.78rem;
      padding: 3px 8px;
      background: var(--bg-subtle);
      color: var(--primary-dark);
      border-radius: 4px;
      font-weight: 500;
    }

    /* Model Matrix Badge Cloud */
    .models-cloud {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      margin-top: 24px;
    }

    .models-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .model-chip {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 7px 14px;
      background: var(--bg-subtle);
      border: 1px solid #ccfbf1;
      border-radius: 8px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      transition: all 0.2s ease;
    }

    .model-chip:hover {
      background: #99f6e4;
      border-color: var(--primary);
      transform: scale(1.04);
    }

    /* Flow Steps */
    .step-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius);
      padding: 26px;
      position: relative;
    }

    .step-num {
      position: absolute;
      top: 18px;
      right: 18px;
      font-size: 1.8rem;
      font-weight: 900;
      color: #ccfbf1;
      line-height: 1;
    }

    /* Tables */
    .table-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      overflow-x: auto;
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

    .custom-table th {
      background: var(--bg-subtle);
      color: var(--text-main);
      font-weight: 700;
      padding: 16px 20px;
      border-bottom: 2px solid var(--border-color);
      white-space: nowrap;
    }

    .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-subtle);
      color: var(--text-muted);
    }

    .custom-table tr:last-child td {
      border-bottom: none;
    }

    .custom-table tr:hover td {
      background-color: #f8fafc;
    }

    .badge-recommend {
      background: #ecfdf5;
      color: #047857;
      border: 1px solid #a7f3d0;
      font-size: 0.8rem;
      padding: 3px 8px;
      border-radius: 4px;
      font-weight: 600;
    }

    /* Evaluation Score Box */
    .score-overview {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, #0f766e 0%, #0d9488 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 28px 36px;
      margin-bottom: 28px;
      box-shadow: var(--shadow-md);
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-title {
      font-size: 1.4rem;
      font-weight: 700;
    }

    .score-desc {
      font-size: 0.95rem;
      opacity: 0.9;
      margin-top: 4px;
    }

    .score-rating {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .score-stars {
      color: #facc15;
      font-size: 1.6rem;
      letter-spacing: 2px;
    }

    .score-val {
      font-size: 2.4rem;
      font-weight: 900;
      line-height: 1;
    }

    /* Visual Media Showcase Section */
    .media-card-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

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

    .media-card-img-wrap {
      width: 100%;
      background: #e2e8f0;
      aspect-ratio: 16 / 9;
      overflow: hidden;
    }

    .media-card-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }

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

    .media-card-body {
      padding: 20px;
    }

    .banner-gallery-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

    .banner-gallery-item {
      border-radius: 8px;
      overflow: hidden;
      border: 1px solid var(--border-subtle);
      background: #ffffff;
      box-shadow: var(--shadow-sm);
    }

    .banner-gallery-item img {
      width: 100%;
      height: 140px;
      object-fit: cover;
      display: block;
    }

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

    .review-user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .review-avatar-char {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent) 100%);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
    }

    .review-author {
      font-weight: 700;
      font-size: 1rem;
      color: var(--text-main);
    }

    .review-role {
      font-size: 0.82rem;
      color: var(--primary-dark);
    }

    .review-quote {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      font-style: normal;
    }

    /* FAQ Section */
    .faq-wrapper {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: 10px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      color: var(--text-main);
      background: #ffffff;
      transition: background-color 0.2s ease;
      user-select: none;
    }

    .faq-question:hover {
      background-color: var(--bg-subtle);
      color: var(--primary-dark);
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.2s ease;
    }

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

    .faq-answer {
      display: none;
      padding: 0 24px 20px 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
      border-top: 1px solid var(--border-color);
      background: #ffffff;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* Articles & News */
    .article-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }

    .article-links-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
      list-style: none;
      margin-top: 16px;
    }

    .article-links-list a {
      color: var(--primary-dark);
      text-decoration: none;
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 10px 14px;
      border: 1px solid var(--border-subtle);
      border-radius: 8px;
      transition: all 0.2s ease;
    }

    .article-links-list a:hover {
      background-color: var(--bg-subtle);
      border-color: var(--primary-light);
      transform: translateX(4px);
    }

    /* Forms & Contact */
    .form-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      margin-bottom: 6px;
      font-weight: 600;
      font-size: 0.92rem;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-subtle);
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      background: #ffffff;
      transition: border-color 0.2s ease;
      font-family: inherit;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
    }

    .form-submit-btn {
      width: 100%;
      padding: 14px;
      font-size: 1rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent-dark) 100%);
      color: #ffffff;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .form-submit-btn:hover {
      background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
      box-shadow: 0 6px 18px rgba(13, 148, 136, 0.3);
    }

    .contact-card-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .contact-item-icon {
      width: 40px;
      height: 40px;
      border-radius: 8px;
      background: var(--bg-subtle);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: bold;
      flex-shrink: 0;
    }

    .contact-qr-wrap {
      text-align: center;
      padding: 16px;
      background: var(--bg-subtle);
      border-radius: 8px;
      border: 1px dashed var(--border-color);
      margin-top: 10px;
    }

    .contact-qr-wrap img {
      width: 130px;
      height: 130px;
      display: block;
      margin: 0 auto 8px auto;
      border-radius: 6px;
    }

    /* Footer */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 24px 0;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col-title {
      color: #f8fafc;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s ease;
    }

    .footer-links a:hover {
      color: #2dd4bf;
    }

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 10px;
    }

    .friend-links-wrap a {
      color: #cbd5e1;
      text-decoration: none;
      font-size: 0.85rem;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
      transition: all 0.2s ease;
    }

    .friend-links-wrap a:hover {
      background: #0f766e;
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* Floating Customer Service */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent-dark) 100%);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
      cursor: pointer;
      text-decoration: none;
      font-size: 1.2rem;
      transition: transform 0.2s ease;
    }

    .floating-btn:hover {
      transform: scale(1.08);
      color: #ffffff;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .grid-4, .step-grid, .banner-gallery-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 2rem;
      }
      .hero-stats-grid, .grid-2, .grid-3, .grid-4, .step-grid, .media-card-grid, .banner-gallery-grid, .article-links-list {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .score-overview {
        flex-direction: column;
        text-align: center;
      }
      .score-rating {
        justify-content: center;
      }
    }