:root {
      --primary-cyan: #0d9488;
      --primary-teal: #14b8a6;
      --primary-deep: #0f172a;
      --primary-light: #f0fdfa;
      --accent-cyan: #2dd4bf;
      --accent-soft: #ccfbf1;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 8px rgba(13, 148, 136, 0.06);
      --shadow-md: 0 10px 25px -5px rgba(13, 148, 136, 0.1), 0 8px 10px -6px rgba(13, 148, 136, 0.05);
      --shadow-lg: 0 20px 30px -10px rgba(15, 23, 42, 0.08);
      --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, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      min-width: 320px;
    }
    a { text-decoration: none; color: inherit; transition: all 0.25s ease; }
    ul { list-style: none; }
    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .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 10px rgba(0, 0, 0, 0.03);
    }
    .nav-wrap {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }
    .nav-links li a {
      font-size: 0.92rem;
      color: var(--text-main);
      font-weight: 500;
      padding: 8px 12px;
      border-radius: 6px;
      display: inline-block;
    }
    .nav-links li a:hover {
      color: var(--primary-cyan);
      background: var(--primary-light);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-top-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      border-radius: 8px;
      background: linear-gradient(135deg, var(--primary-cyan), #0f766e);
      color: #ffffff;
      font-size: 0.9rem;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(13, 148, 136, 0.25);
    }
    .btn-top-portal:hover {
      box-shadow: 0 6px 18px rgba(13, 148, 136, 0.35);
      transform: translateY(-1px);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    .hero-section {
      background: radial-gradient(circle at 80% 20%, rgba(45, 212, 191, 0.15) 0%, rgba(240, 253, 250, 0.8) 45%, var(--bg-page) 100%);
      padding: 80px 0 60px;
      position: relative;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.25fr 0.95fr;
      gap: 40px;
      align-items: center;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 14px;
      background: var(--accent-soft);
      color: var(--primary-cyan);
      border-radius: 30px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 20px;
      border: 1px solid rgba(20, 184, 166, 0.3);
    }
    .hero-title {
      font-size: 2.6rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--primary-deep);
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }
    .hero-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 32px;
      max-width: 620px;
    }
    .hero-btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 40px;
    }
    .btn-main-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 34px;
      border-radius: 8px;
      background: linear-gradient(135deg, #0d9488 0%, #0f766e 100%);
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      box-shadow: 0 8px 20px rgba(13, 148, 136, 0.3);
      border: 1px solid rgba(255, 255, 255, 0.2);
    }
    .btn-main-portal:hover {
      background: linear-gradient(135deg, #14b8a6 0%, #0d9488 100%);
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(13, 148, 136, 0.4);
    }
    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 28px;
      border-radius: 8px;
      background: #ffffff;
      color: var(--primary-cyan);
      font-size: 1rem;
      font-weight: 600;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .btn-secondary:hover {
      background: var(--primary-light);
      border-color: var(--accent-cyan);
    }
    .hero-stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      padding-top: 24px;
      border-top: 1px solid var(--border-color);
    }
    .stat-number {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary-cyan);
      line-height: 1.1;
    }
    .stat-label {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-top: 4px;
    }
    .hero-card-panel {
      background: #ffffff;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
      padding: 30px;
      position: relative;
    }
    .hero-panel-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 20px;
      padding-bottom: 12px;
      border-bottom: 1px solid var(--border-color);
    }
    .panel-tag {
      font-size: 0.8rem;
      padding: 4px 10px;
      background: var(--primary-light);
      color: var(--primary-cyan);
      border-radius: 4px;
      font-weight: 600;
    }
    .model-tags-box {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 24px;
    }
    .model-pill {
      font-size: 0.8rem;
      padding: 5px 12px;
      background: #f1f5f9;
      color: #334155;
      border-radius: 6px;
      font-weight: 500;
      border: 1px solid #e2e8f0;
    }
    .pipeline-preview {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .pipeline-step-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 16px;
      background: #f8fafc;
      border-radius: 8px;
      font-size: 0.9rem;
      border-left: 3px solid var(--primary-cyan);
    }

    .section-wrap {
      padding: 70px 0;
      position: relative;
    }
    .section-alt {
      background: #f1f5f9;
    }
    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 50px;
    }
    .section-subtitle {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: var(--primary-cyan);
      margin-bottom: 8px;
      display: inline-block;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-deep);
      line-height: 1.3;
      margin-bottom: 14px;
    }
    .section-intro {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .card-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 26px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent-cyan);
    }
    .card-icon-tag {
      width: 44px;
      height: 44px;
      border-radius: 8px;
      background: var(--accent-soft);
      color: var(--primary-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .card-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 10px;
    }
    .card-text {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .process-timeline {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }
    .process-node {
      background: #ffffff;
      padding: 22px 18px;
      border-radius: 10px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      position: relative;
    }
    .process-order {
      width: 34px;
      height: 34px;
      line-height: 34px;
      border-radius: 50%;
      background: var(--primary-cyan);
      color: #ffffff;
      font-weight: 700;
      margin: 0 auto 12px;
      font-size: 0.9rem;
    }
    .process-title {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--primary-deep);
    }
    .process-desc {
      font-size: 0.82rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    .review-score-hero {
      background: linear-gradient(135deg, #0f766e 0%, #042f2e 100%);
      border-radius: 16px;
      padding: 36px;
      color: #ffffff;
      display: grid;
      grid-template-columns: 1fr 2fr;
      gap: 30px;
      align-items: center;
      margin-bottom: 36px;
    }
    .score-badge-area {
      text-align: center;
      border-right: 1px solid rgba(255, 255, 255, 0.15);
      padding-right: 20px;
    }
    .score-stars {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
      margin-bottom: 6px;
    }
    .score-number {
      font-size: 3.6rem;
      font-weight: 900;
      line-height: 1;
      color: #ffffff;
    }
    .score-meta {
      font-size: 0.95rem;
      opacity: 0.85;
      margin-top: 8px;
    }
    .score-verdict h3 {
      font-size: 1.5rem;
      margin-bottom: 10px;
      font-weight: 700;
    }
    .score-verdict p {
      font-size: 0.92rem;
      line-height: 1.6;
      opacity: 0.9;
    }

    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .data-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.9rem;
    }
    .data-table th, .data-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .data-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--primary-deep);
    }
    .data-table tr:last-child td {
      border-bottom: none;
    }
    .data-table tr:hover td {
      background: #f0fdfa;
    }
    .badge-highlight {
      display: inline-block;
      padding: 3px 8px;
      border-radius: 4px;
      font-size: 0.8rem;
      font-weight: 600;
      background: #ccfbf1;
      color: #0f766e;
    }

    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border-radius: 10px;
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 22px;
      background: none;
      border: none;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 1.02rem;
      font-weight: 700;
      color: var(--primary-deep);
      cursor: pointer;
    }
    .faq-question:hover {
      color: var(--primary-cyan);
    }
    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
      color: var(--primary-cyan);
    }
    .faq-answer {
      display: none;
      padding: 0 22px 20px;
      font-size: 0.92rem;
      color: #475569;
      line-height: 1.7;
      border-top: 1px dashed var(--border-color);
      margin-top: 4px;
      padding-top: 14px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .comment-card {
      background: #ffffff;
      padding: 24px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .comment-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
      padding-top: 14px;
      border-top: 1px solid #f1f5f9;
    }
    .avatar-circle {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--accent-soft);
      color: var(--primary-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
    }
    .user-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--primary-deep);
    }
    .user-title {
      font-size: 0.78rem;
      color: var(--text-muted);
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      align-items: start;
    }
    .contact-card-info {
      background: #ffffff;
      padding: 32px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      margin-bottom: 20px;
    }
    .contact-item strong {
      display: block;
      color: var(--primary-deep);
      font-size: 0.95rem;
    }
    .contact-item p {
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    .qr-container {
      margin-top: 24px;
      padding: 20px;
      background: #f8fafc;
      border-radius: 8px;
      text-align: center;
      border: 1px solid var(--border-color);
    }
    .qr-container img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      border-radius: 6px;
      background: #fff;
      padding: 4px;
      box-shadow: var(--shadow-sm);
    }
    .form-container {
      background: #ffffff;
      padding: 34px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 6px;
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 0.92rem;
      color: var(--text-main);
      background: #ffffff;
      outline: none;
      transition: border-color 0.2s ease;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary-cyan);
      box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
    }
    .form-textarea {
      resize: vertical;
      min-height: 90px;
    }
    .btn-submit {
      width: 100%;
      padding: 13px;
      background: linear-gradient(135deg, var(--primary-cyan), #0f766e);
      color: #ffffff;
      border: none;
      border-radius: 6px;
      font-size: 1rem;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(13, 148, 136, 0.2);
    }
    .btn-submit:hover {
      background: linear-gradient(135deg, var(--primary-teal), var(--primary-cyan));
    }

    .media-card {
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .media-card-img {
      aspect-ratio: 16/9;
      width: 100%;
      background: #f1f5f9;
      overflow: hidden;
    }
    .media-card-img.square {
      aspect-ratio: 1/1;
    }
    .media-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }
    .media-card-body {
      padding: 18px;
    }
    .media-card-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--primary-deep);
    }
    .media-card-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .article-link-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 14px;
      margin-top: 24px;
    }
    .article-item-link {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 14px 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.9rem;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
    }
    .article-item-link:hover {
      border-color: var(--primary-cyan);
      color: var(--primary-cyan);
      background: var(--primary-light);
    }

    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 16px;
      font-weight: 700;
    }
    .footer-col p {
      font-size: 0.86rem;
      line-height: 1.6;
      margin-bottom: 12px;
    }
    .footer-links li {
      margin-bottom: 8px;
    }
    .footer-links a {
      color: #94a3b8;
      font-size: 0.86rem;
    }
    .footer-links a:hover {
      color: var(--accent-cyan);
    }
    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding: 24px 0;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 12px 18px;
      font-size: 0.85rem;
    }
    .friend-links-box span {
      color: #ffffff;
      font-weight: 600;
    }
    .friend-links-box a {
      color: #64748b;
    }
    .friend-links-box a:hover {
      color: var(--accent-cyan);
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      text-align: center;
      font-size: 0.82rem;
      color: #64748b;
    }

    .floating-kefu {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary-cyan);
      box-shadow: 0 4px 16px rgba(0,0,0,0.15);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.1rem;
      position: relative;
    }
    .float-btn:hover {
      background: var(--primary-light);
      color: #0f766e;
    }
    .float-qr-pop {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      width: 150px;
      text-align: center;
    }
    .float-qr-pop img {
      width: 100%;
      height: auto;
      display: block;
    }
    .float-qr-pop span {
      font-size: 0.75rem;
      color: var(--text-main);
      display: block;
      margin-top: 6px;
      font-weight: 600;
    }
    .float-btn:hover .float-qr-pop {
      display: block;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
      .process-timeline { grid-template-columns: repeat(3, 1fr); }
      .contact-grid { grid-template-columns: 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.show {
        display: flex;
      }
      .mobile-toggle { display: block; }
      .hero-title { font-size: 1.9rem; }
      .card-grid-3, .card-grid-2, .card-grid-4 { grid-template-columns: 1fr; }
      .process-timeline { grid-template-columns: 1fr; }
      .review-score-hero { grid-template-columns: 1fr; text-align: center; }
      .score-badge-area { border-right: none; border-bottom: 1px solid rgba(255, 255, 255, 0.15); padding: 0 0 20px; }
      .footer-grid { grid-template-columns: 1fr; }
    }