:root {
      --primary: #4361ee;
      --primary-dark: #3a0ca3;
      --secondary: #f72585;
      --accent: #4cc9f0;
      --accent-warm: #ffb703;
      --success: #06d6a0;
      --bg-light: #fafcff;
      --bg-alt: #f0f4fd;
      --card-bg: #ffffff;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --text-light: #94a3b8;
      --border-color: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --shadow-sm: 0 4px 6px -1px rgba(67, 97, 238, 0.05), 0 2px 4px -2px rgba(67, 97, 238, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(67, 97, 238, 0.08), 0 8px 10px -6px rgba(67, 97, 238, 0.04);
      --shadow-lg: 0 20px 35px -5px rgba(67, 97, 238, 0.12), 0 10px 10px -5px rgba(67, 97, 238, 0.04);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      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, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      transition: var(--transition);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }
    .brand-box img.ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      color: var(--text-main);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background-color: rgba(67, 97, 238, 0.08);
    }
    .header-actions {
      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: 50px;
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: 2px solid transparent;
      line-height: 1.2;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(247, 37, 133, 0.3);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(247, 37, 133, 0.45);
      color: #ffffff;
    }
    .btn-outline {
      background-color: transparent;
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background-color: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }
    .btn-accent {
      background: linear-gradient(135deg, var(--accent-warm) 0%, var(--secondary) 100%);
      color: #ffffff;
    }
    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(255, 183, 3, 0.4);
      color: #ffffff;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    section {
      padding: 70px 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--bg-alt);
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }
    .section-badge {
      display: inline-block;
      padding: 6px 16px;
      background: rgba(67, 97, 238, 0.1);
      color: var(--primary);
      font-weight: 600;
      font-size: 0.85rem;
      border-radius: 50px;
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .hero-section {
      padding: 90px 0 80px;
      background: radial-gradient(circle at 10% 20%, rgba(76, 201, 240, 0.15) 0%, rgba(247, 37, 133, 0.08) 50%, rgba(250, 252, 255, 1) 100%);
      position: relative;
      overflow: hidden;
      text-align: center;
    }
    .hero-content {
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }
    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      padding: 8px 20px;
      border-radius: 50px;
      border: 1px solid rgba(67, 97, 238, 0.2);
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary-dark);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }
    .hero-tag-dot {
      width: 10px;
      height: 10px;
      background-color: var(--success);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 0 3px rgba(6, 214, 160, 0.25);
    }
    .hero-title {
      font-size: 2.7rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }
    .hero-title-highlight {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
      margin-bottom: 45px;
    }
    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      border: 1px solid rgba(226, 232, 240, 0.8);
      margin-top: 20px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    .models-marquee {
      background: #ffffff;
      padding: 24px 0;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }
    .marquee-label {
      text-align: center;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--text-light);
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 1.5px;
    }
    .tags-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }
    .model-chip {
      padding: 6px 14px;
      background: var(--bg-alt);
      border: 1px solid var(--border-color);
      border-radius: 50px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      transition: var(--transition);
    }
    .model-chip:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .card-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 30px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(67, 97, 238, 0.3);
    }
    .card-icon {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      background: linear-gradient(135deg, rgba(67, 97, 238, 0.1) 0%, rgba(247, 37, 133, 0.1) 100%);
      color: var(--primary);
    }
    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .card-tag {
      margin-top: 16px;
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--secondary);
    }

    .media-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .media-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .media-card-img-wrap {
      width: 100%;
      background: #f1f5f9;
      position: relative;
      overflow: hidden;
    }
    .media-card-img-wrap img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
      transition: transform 0.5s ease;
    }
    .media-card:hover .media-card-img-wrap img {
      transform: scale(1.05);
    }
    .media-card-body {
      padding: 24px;
    }

    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .flow-step {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      padding: 28px 20px;
      border-radius: var(--radius-md);
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .flow-num {
      width: 44px;
      height: 44px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
      margin: 0 auto 16px;
      box-shadow: 0 4px 10px rgba(67, 97, 238, 0.3);
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: var(--card-bg);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }
    .custom-table th {
      background-color: var(--bg-alt);
      font-weight: 700;
      color: var(--text-main);
    }
    .custom-table tr:hover td {
      background-color: rgba(67, 97, 238, 0.02);
    }
    .badge-highlight {
      background: rgba(247, 37, 133, 0.1);
      color: var(--secondary);
      padding: 4px 10px;
      border-radius: 4px;
      font-weight: 600;
      font-size: 0.85rem;
    }

    .score-banner {
      background: linear-gradient(135deg, #3a0ca3 0%, #4361ee 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 40px;
      box-shadow: var(--shadow-lg);
    }
    .score-val {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--accent-warm);
      line-height: 1;
    }

    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item.active {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 20px 24px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-main);
    }
    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(180deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: rgba(240, 244, 253, 0.5);
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 24px 20px;
    }

    .review-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      height: 100%;
      box-shadow: var(--shadow-sm);
    }
    .review-header {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 14px;
    }
    .review-avatar {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }
    .review-user-name {
      font-weight: 700;
      font-size: 1rem;
      color: var(--text-main);
    }
    .review-user-role {
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .review-stars {
      color: var(--accent-warm);
      margin-bottom: 10px;
      font-size: 0.9rem;
    }
    .review-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .form-wrapper {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }
    .form-group-full {
      grid-column: span 2;
    }
    .form-label {
      display: block;
      font-weight: 600;
      font-size: 0.9rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-family: inherit;
      color: var(--text-main);
      background-color: #ffffff;
      transition: var(--transition);
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    .articles-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .article-item {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: space-between;
      text-decoration: none;
      color: var(--text-main);
      transition: var(--transition);
    }
    .article-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
      color: var(--primary);
    }
    .article-title {
      font-weight: 600;
      font-size: 0.95rem;
    }
    .article-arrow {
      color: var(--primary);
      font-weight: bold;
    }

    footer.site-footer {
      background-color: #0f172a;
      color: #cbd5e1;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand-title {
      color: #ffffff;
      font-size: 1.3rem;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .footer-brand-desc {
      font-size: 0.9rem;
      color: #94a3b8;
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .footer-heading {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links li a,
    .friend-links a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.9rem;
      transition: var(--transition);
    }
    .footer-links li a:hover,
    .friend-links a:hover {
      color: var(--accent);
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding: 20px 0;
      border-top: 1px solid #1e293b;
      border-bottom: 1px solid #1e293b;
      margin-bottom: 24px;
    }
    .friend-links-title {
      color: #ffffff;
      font-size: 0.9rem;
      font-weight: 600;
      margin-right: 10px;
    }
    .qr-box {
      background: #ffffff;
      padding: 8px;
      border-radius: var(--radius-sm);
      display: inline-block;
      width: 100px;
      height: 100px;
      margin-top: 10px;
    }
    .qr-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }
    .footer-bottom {
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
      padding-top: 10px;
    }

    .float-service {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.2rem;
      cursor: pointer;
      text-decoration: none;
      transition: var(--transition);
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.1);
    }
    .float-qr-panel {
      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-panel img {
      width: 100%;
      height: auto;
      border-radius: 4px;
    }
    .float-qr-wrap:hover .float-qr-panel {
      display: block;
    }

    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .card-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .card-grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        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);
        display: none;
      }
      .nav-links.active {
        display: flex;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .card-grid-3,
      .card-grid-2,
      .card-grid-4 {
        grid-template-columns: 1fr;
      }
      .flow-steps {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
      .score-banner {
        flex-direction: column;
        text-align: center;
        gap: 20px;
      }
    }