:root {
      --primary: #059669;
      --primary-hover: #047857;
      --primary-light: #ecfdf5;
      --primary-glow: rgba(16, 185, 129, 0.15);
      --accent: #10b981;
      --accent-bright: #34d399;
      --dark: #0f172a;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.06), 0 2px 4px -1px rgba(0,0,0,0.03);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.07), 0 4px 6px -2px rgba(0,0,0,0.04);
      --shadow-green: 0 10px 25px -5px rgba(16, 185, 129, 0.25);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --radius-xl: 24px;
    }

    * {
      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-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.95);
      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-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .brand-box .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-name {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--dark);
      letter-spacing: -0.5px;
    }

    .brand-name span {
      color: var(--primary);
    }

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

    .nav-links li a {
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: var(--primary-light);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--accent-bright) 0%, var(--primary-hover) 100%);
      box-shadow: var(--shadow-green);
      transform: translateY(-1px);
    }

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

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

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--dark);
      cursor: pointer;
      padding: 6px;
    }

    .hero-section {
      position: relative;
      padding: 80px 0 90px;
      background: radial-gradient(circle at 50% 10%, #d1fae5 0%, #f0fdf4 40%, var(--bg-page) 100%);
      overflow: hidden;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #a7f3d0;
      border-radius: 9999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent);
    }

    .hero-title {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 900;
      color: var(--dark);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title .highlight {
      background: linear-gradient(120deg, #059669 0%, #10b981 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      max-width: 780px;
      margin: 0 auto 36px;
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    .hero-btn-main {
      padding: 14px 36px;
      font-size: 1.08rem;
      box-shadow: 0 8px 20px rgba(5, 150, 105, 0.35);
    }

    .hero-features-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1040px;
      margin: 0 auto;
      background: #ffffff;
      padding: 24px 30px;
      border-radius: var(--radius-xl);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
    }

    .hero-feat-item {
      display: flex;
      align-items: center;
      gap: 12px;
      text-align: left;
    }

    .feat-icon-box {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-md);
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      flex-shrink: 0;
    }

    .feat-text-box h4 {
      font-size: 0.96rem;
      font-weight: 700;
      color: var(--dark);
    }

    .feat-text-box p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .section-wrap {
      padding: 80px 0;
      position: relative;
    }

    .section-wrap:nth-child(even) {
      background: #ffffff;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 14px;
      border-radius: 9999px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

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

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px 24px;
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #a7f3d0;
    }

    .stat-num {
      font-size: 2.5rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
    }

    .stat-label {
      font-size: 1rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 4px;
    }

    .stat-sub {
      font-size: 0.84rem;
      color: var(--text-muted);
    }

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

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #6ee7b7;
    }

    .card-icon-round {
      width: 48px;
      height: 48px;
      border-radius: 14px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 20px;
    }

    .card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 10px;
    }

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

    .card-badge {
      align-self: flex-start;
      margin-top: 16px;
      font-size: 0.78rem;
      font-weight: 600;
      color: var(--primary);
      background: #d1fae5;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
    }

    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }

    .process-step {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px 20px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      font-weight: 800;
      font-size: 1.1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      box-shadow: 0 4px 10px rgba(5, 150, 105, 0.3);
    }

    .process-step h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 8px;
    }

    .process-step p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    .model-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 18px;
      border-radius: 9999px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 6px;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .model-tag:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--primary-light);
      transform: scale(1.04);
    }

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

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .custom-table th,
    .custom-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.94rem;
    }

    .custom-table th {
      background: #f8fafc;
      color: var(--dark);
      font-weight: 700;
    }

    .custom-table tbody tr:hover {
      background: #f0fdf4;
    }

    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #ecfdf5;
      color: #047857;
      border: 1px solid #6ee7b7;
      font-weight: 800;
      padding: 6px 14px;
      border-radius: var(--radius-md);
    }

    .rating-stars {
      color: #f59e0b;
    }

    .banner-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-bottom: 30px;
    }

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

    .banner-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }

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

    .banner-info {
      padding: 16px;
    }

    .banner-info h4 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 4px;
    }

    .banner-info p {
      font-size: 0.84rem;
      color: var(--text-muted);
    }

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

    .testimonial-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;
    }

    .testimonial-card:hover {
      border-color: #6ee7b7;
      box-shadow: var(--shadow-md);
    }

    .testi-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .testi-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #d1fae5;
      color: var(--primary);
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
    }

    .testi-name {
      font-weight: 700;
      color: var(--dark);
      font-size: 0.95rem;
    }

    .testi-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .testi-content {
      font-size: 0.9rem;
      color: #334155;
      line-height: 1.6;
      margin-bottom: 14px;
    }

    .faq-container {
      max-width: 880px;
      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: border-color 0.25s ease;
    }

    .faq-item.active {
      border-color: var(--primary);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1rem;
      font-weight: 700;
      color: var(--dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      background: #ffffff;
    }

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

    .faq-arrow {
      font-size: 0.85rem;
      transition: transform 0.3s ease;
      color: var(--text-muted);
    }

    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
      color: var(--primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.6;
      background: #fafafa;
    }

    .faq-item.active .faq-answer {
      max-height: 250px;
      padding: 0 24px 18px;
    }

    .articles-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .article-item {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .article-item a {
      font-weight: 700;
      color: var(--dark);
      font-size: 1.05rem;
      margin-bottom: 8px;
      display: inline-block;
    }

    .article-item a:hover {
      color: var(--primary);
    }

    .article-meta {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .contact-card-box {
      background: #ffffff;
      border-radius: var(--radius-xl);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
      padding: 40px;
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--dark);
      background: #fdfdfd;
      outline: none;
      transition: border-color 0.25s ease;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 16px;
    }

    .contact-icon {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      flex-shrink: 0;
    }

    .contact-details h4 {
      font-size: 0.96rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 2px;
    }

    .contact-details p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .qr-container {
      display: inline-block;
      padding: 10px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-top: 10px;
    }

    .qr-container img {
      width: 130px;
      height: 130px;
      display: block;
      border-radius: var(--radius-sm);
    }

    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

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

    .footer-col h4 {
      font-size: 1.05rem;
      color: #ffffff;
      font-weight: 700;
      margin-bottom: 18px;
    }

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

    .footer-links li a {
      color: #94a3b8;
      font-size: 0.9rem;
    }

    .footer-links li a:hover {
      color: var(--accent-bright);
    }

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

    .friend-links-box a {
      font-size: 0.85rem;
      color: #94a3b8;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
    }

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
      flex-wrap: wrap;
      gap: 12px;
    }

    .float-panel {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      position: relative;
      font-size: 1.2rem;
      transition: all 0.25s ease;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    .float-qr-card {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      width: 150px;
      text-align: center;
    }

    .float-qr-card img {
      width: 100%;
      height: auto;
      border-radius: var(--radius-sm);
      margin-bottom: 6px;
    }

    .float-qr-card span {
      font-size: 0.75rem;
      color: var(--dark);
      font-weight: 600;
    }

    .float-btn:hover .float-qr-card {
      display: block;
    }

    @media (max-width: 1024px) {
      .hero-features-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4, .stats-grid, .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .testimonials-grid, .banner-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links, .header-actions {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .mobile-nav-active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        border-bottom: 1px solid var(--border-color);
        gap: 8px;
      }
      .hero-title {
        font-size: 2rem;
      }
      .hero-features-bar {
        grid-template-columns: 1fr;
      }
      .grid-3, .grid-4, .grid-2, .stats-grid, .process-timeline, .testimonials-grid, .banner-grid, .articles-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }