:root {
      --primary: #ff5722;
      --primary-gradient: linear-gradient(135deg, #ff5722 0%, #ff8a00 50%, #e91e63 100%);
      --accent-gradient: linear-gradient(135deg, #00c6ff 0%, #0072ff 100%);
      --bg-page: #fbfbfd;
      --surface: #ffffff;
      --surface-alt: #f4f6fb;
      --text-main: #1d1d1f;
      --text-muted: #5e6878;
      --border-color: #e5e9f2;
      --brand-orange: #ff7a00;
      --brand-blue: #2563eb;
      --shadow-sm: 0 4px 12px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 20px 45px rgba(255, 87, 34, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
    }

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

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

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

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(229, 233, 242, 0.8);
      box-shadow: var(--shadow-sm);
    }

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

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

    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
      display: block;
    }

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

    .nav-links li a {
      font-size: 15px;
      font-weight: 600;
      color: #334155;
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background-color: #fff3ed;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 15px;
      font-weight: 600;
      border-radius: 30px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

    .btn:hover {
      transform: translateY(-2px);
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff;
      box-shadow: 0 6px 18px rgba(255, 87, 34, 0.3);
    }

    .btn-primary:hover {
      box-shadow: 0 8px 24px rgba(255, 87, 34, 0.45);
      color: #ffffff;
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--primary);
      border-color: #ffd8cc;
    }

    .btn-secondary:hover {
      background: #fff6f2;
      border-color: var(--primary);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: #1e293b;
    }

    .hero-section {
      position: relative;
      padding: 90px 0 70px;
      background: radial-gradient(circle at 80% 20%, #ffe8db 0%, rgba(255,255,255,0) 60%),
                  radial-gradient(circle at 10% 80%, #e0f2fe 0%, rgba(255,255,255,0) 50%),
                  #ffffff;
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 18px;
      background: #fff1eb;
      color: var(--primary);
      font-size: 14px;
      font-weight: 700;
      border-radius: 20px;
      margin-bottom: 24px;
      border: 1px solid #ffd5c4;
    }

    .hero-title {
      font-size: 44px;
      line-height: 1.25;
      font-weight: 800;
      color: #0f172a;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-title span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
    }

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

    .btn-hero-main {
      padding: 14px 36px;
      font-size: 17px;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      padding: 24px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }

    .stat-item {
      text-align: center;
      border-right: 1px solid #f1f5f9;
    }

    .stat-item:last-child {
      border-right: none;
    }

    .stat-value {
      font-size: 30px;
      font-weight: 800;
      color: #0f172a;
      line-height: 1.2;
    }

    .stat-value span {
      color: var(--primary);
      font-size: 20px;
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 6px;
      font-weight: 500;
    }

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

    .section-alt {
      background: #f8fafc;
      border-top: 1px solid #edf2f7;
      border-bottom: 1px solid #edf2f7;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 54px;
    }

    .section-tag {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      background: #fff0ea;
      padding: 4px 12px;
      border-radius: 12px;
      display: inline-block;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .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: 32px;
    }

    .card {
      background: var(--surface);
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border-color);
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
      position: relative;
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #ffd2c0;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: #fff4ef;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .card h3 {
      font-size: 19px;
      font-weight: 700;
      color: #1e293b;
      margin-bottom: 10px;
    }

    .card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .model-tags-container {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      color: #334155;
      box-shadow: var(--shadow-sm);
    }

    .model-tag.highlight {
      background: #fff6f2;
      border-color: #ffccb8;
      color: var(--primary);
    }

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

    .flow-step {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
    }

    .flow-num {
      width: 36px;
      height: 36px;
      line-height: 36px;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 800;
      border-radius: 50%;
      margin: 0 auto 16px;
      font-size: 16px;
    }

    .flow-step h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
      color: #0f172a;
    }

    .flow-step p {
      font-size: 13px;
      color: var(--text-muted);
    }

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

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #edf2f7;
    }

    .compare-table th {
      background: #f8fafc;
      color: #334155;
      font-weight: 700;
    }

    .compare-table td strong {
      color: var(--primary);
    }

    .compare-badge {
      display: inline-block;
      padding: 3px 8px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 700;
    }

    .badge-win {
      background: #ecfdf5;
      color: #059669;
    }

    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
      color: #ffffff;
      padding: 30px 40px;
      border-radius: var(--radius-lg);
      margin-bottom: 30px;
    }

    .rating-score {
      font-size: 42px;
      font-weight: 900;
      color: #fbbf24;
      line-height: 1;
    }

    .rating-stars {
      color: #fbbf24;
      font-size: 20px;
      letter-spacing: 2px;
      margin-top: 4px;
    }

    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      transition: border-color 0.2s ease;
    }

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

    .faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 700;
      color: #0f172a;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }

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

    .faq-icon {
      font-size: 18px;
      font-weight: bold;
      transition: transform 0.3s ease;
      color: #94a3b8;
    }

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

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 14px;
      color: #475569;
      line-height: 1.7;
      border-top: 1px dashed #edf2f7;
      padding-top: 16px;
    }

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

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

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

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
    }

    .user-info h5 {
      font-size: 15px;
      font-weight: 700;
      color: #0f172a;
    }

    .user-info span {
      font-size: 12px;
      color: var(--text-muted);
    }

    .review-stars {
      color: #f59e0b;
      font-size: 13px;
      margin-bottom: 8px;
    }

    .review-card p {
      font-size: 13px;
      color: #334155;
      line-height: 1.6;
    }

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

    .media-img-wrap {
      width: 100%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

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

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

    .media-content {
      padding: 20px;
    }

    .media-content h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
      color: #0f172a;
    }

    .media-content p {
      font-size: 13px;
      color: var(--text-muted);
    }

    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

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

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
      color: #1e293b;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 14px;
      background: #f8fafc;
      color: #0f172a;
      transition: border-color 0.2s ease, background 0.2s ease;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
    }

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

    .contact-info-panel {
      background: #fafafc;
      padding: 30px;
      border-radius: var(--radius-md);
      border: 1px solid #f1f5f9;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .info-list-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 14px;
      color: #334155;
    }

    .qr-container {
      margin-top: 20px;
      text-align: center;
      background: #ffffff;
      padding: 16px;
      border-radius: var(--radius-sm);
      border: 1px solid #e2e8f0;
      display: inline-block;
      max-width: 180px;
    }

    .qr-container img {
      max-width: 100%;
      height: auto;
      border-radius: 4px;
      display: block;
      margin: 0 auto 8px;
    }

    .qr-container span {
      font-size: 12px;
      color: #64748b;
      font-weight: 600;
    }

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

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 18px 20px;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.2s ease;
    }

    .article-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }

    .article-item a {
      font-size: 14px;
      font-weight: 600;
      color: #1e293b;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .article-date {
      font-size: 12px;
      color: #94a3b8;
    }

    .site-footer {
      background: #111827;
      color: #9ca3af;
      padding: 60px 0 30px;
      border-top: 1px solid #1f2937;
      font-size: 14px;
    }

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

    .footer-brand h4 {
      color: #ffffff;
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 13px;
      line-height: 1.6;
      color: #9ca3af;
    }

    .footer-col h5 {
      color: #f3f4f6;
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 14px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 8px;
    }

    .footer-links a {
      color: #9ca3af;
      font-size: 13px;
    }

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

    .friendly-links {
      padding-top: 24px;
      border-top: 1px solid #1f2937;
      margin-bottom: 24px;
    }

    .friendly-links h6 {
      color: #d1d5db;
      font-size: 13px;
      margin-bottom: 10px;
    }

    .friendly-links-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friendly-links-flex a {
      color: #9ca3af;
      font-size: 12px;
    }

    .friendly-links-flex a:hover {
      color: #ffffff;
    }

    .footer-bottom {
      text-align: center;
      padding-top: 20px;
      border-top: 1px solid #1f2937;
      font-size: 12px;
      color: #6b7280;
    }

    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .tool-btn {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ffffff;
      color: #0f172a;
      box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      border: 1px solid #e2e8f0;
      transition: all 0.2s ease;
      font-size: 18px;
    }

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

    @media (max-width: 992px) {
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 28px;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
      }
      .stat-item {
        border-right: none;
      }
      .grid-3, .grid-4, .grid-2 {
        grid-template-columns: 1fr;
      }
      .flow-steps {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
      .article-list {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    .mobile-menu-overlay {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
      padding: 20px;
      display: none;
      box-shadow: var(--shadow-md);
      z-index: 998;
    }

    .mobile-menu-overlay.open {
      display: block;
    }

    .mobile-menu-list {
      list-style: none;
    }

    .mobile-menu-list li {
      margin-bottom: 12px;
    }

    .mobile-menu-list a {
      font-size: 16px;
      font-weight: 600;
      color: #1e293b;
      display: block;
      padding: 6px 0;
    }