:root {
      --primary: #0052d9;
      --primary-hover: #003cab;
      --secondary: #00a870;
      --accent: #ff6a00;
      --bg-page: #f7f9fc;
      --bg-card: #ffffff;
      --border-color: #e5e9f2;
      --text-main: #1d2129;
      --text-regular: #4e5969;
      --text-secondary: #86909c;
      --shadow-sm: 0 2px 8px rgba(0, 82, 217, 0.04);
      --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.06);
      --shadow-lg: 0 12px 30px rgba(0, 82, 217, 0.1);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 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, "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: var(--transition);
    }

    .container {
      width: 100%;
      max-width: 1200px;
      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(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;
    }

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

    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

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

    .nav-links a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-regular);
      border-radius: var(--radius-sm);
    }

    .nav-links a:hover {
      color: var(--primary);
      background-color: #f2f5fc;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(0, 82, 217, 0.25);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(0, 82, 217, 0.35);
    }

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

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

    .btn-lg {
      padding: 14px 28px;
      font-size: 1.05rem;
      border-radius: var(--radius-md);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
      padding: 4px;
    }

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

    .section-alt {
      background-color: #ffffff;
    }

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

    .section-badge {
      display: inline-block;
      padding: 4px 12px;
      background-color: #e8f0fc;
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: 20px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-regular);
    }

    /* Hero Section (Strictly No Images) */
    .hero-section {
      padding: 100px 0 80px 0;
      background: radial-gradient(100% 100% at 50% 0%, #edf3fc 0%, #f7f9fc 100%);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
      position: relative;
    }

    .hero-section::before {
      content: "";
      position: absolute;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(0, 82, 217, 0.08) 0%, rgba(255,255,255,0) 70%);
      top: -100px;
      left: 50%;
      transform: translateX(-50%);
      pointer-events: none;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 1;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background-color: #ffffff;
      border: 1px solid #d4e2f9;
      border-radius: 30px;
      font-size: 0.9rem;
      color: var(--primary);
      margin-bottom: 24px;
      box-shadow: 0 2px 6px rgba(0, 82, 217, 0.06);
    }

    .hero-tag-badge {
      background: var(--primary);
      color: #fff;
      padding: 2px 8px;
      border-radius: 12px;
      font-size: 0.75rem;
      font-weight: 600;
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      color: var(--primary);
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-regular);
      max-width: 780px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }

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

    .hero-portal-btn {
      background: linear-gradient(135deg, #0052d9 0%, #003cab 100%);
      color: #ffffff !important;
      font-size: 1.1rem;
      padding: 14px 34px;
      border-radius: var(--radius-md);
      box-shadow: 0 8px 24px rgba(0, 82, 217, 0.35);
      border: 1px solid rgba(255, 255, 255, 0.2);
    }

    .hero-portal-btn:hover {
      transform: translateY(-2px) scale(1.02);
      box-shadow: 0 12px 30px rgba(0, 82, 217, 0.45);
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 28px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    .metric-item {
      text-align: center;
      border-right: 1px solid #edf1f7;
    }

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

    .metric-val {
      font-size: 1.9rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-lbl {
      font-size: 0.9rem;
      color: var(--text-secondary);
    }

    /* Model Ticker Banner */
    .model-ticker-section {
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
      padding: 24px 0;
    }

    .ticker-title {
      font-size: 0.9rem;
      color: var(--text-secondary);
      text-align: center;
      margin-bottom: 16px;
      font-weight: 500;
    }

    .model-tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .model-badge {
      display: inline-block;
      padding: 6px 14px;
      background: #f4f6fa;
      border: 1px solid #e1e7f0;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      color: #334155;
      transition: var(--transition);
    }

    .model-badge:hover {
      background: #e8f0fc;
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    /* Grid Layouts */
    .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;
    }

    /* Cards */
    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #c7dcfc;
    }

    .feature-icon-box {
      width: 48px;
      height: 48px;
      background: #eaf1fc;
      color: var(--primary);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      margin-bottom: 18px;
      font-weight: bold;
    }

    .feature-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .feature-desc {
      font-size: 0.95rem;
      color: var(--text-regular);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* Media/Banner Section */
    .visual-showcase-box {
      margin-top: 40px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .visual-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      background: #fff;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }

    .ai-page-image {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
    }

    .visual-item:hover .ai-page-image {
      transform: scale(1.03);
    }

    .visual-caption {
      padding: 14px 18px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
    }

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

    .flow-step-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .flow-num {
      width: 36px;
      height: 36px;
      background: #0052d9;
      color: #fff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      margin-bottom: 16px;
    }

    .flow-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .flow-desc {
      font-size: 0.9rem;
      color: var(--text-regular);
    }

    /* Review & Comparison Table */
    .rating-header-card {
      background: #ffffff;
      border: 1px solid #d0e0fb;
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      box-shadow: var(--shadow-sm);
    }

    .rating-score-box {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .rating-num {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
    }

    .rating-max {
      font-size: 1.2rem;
      color: var(--text-secondary);
    }

    .rating-stars {
      color: #ff9800;
      font-size: 1.3rem;
      margin-top: 4px;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

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

    .highlight-col {
      background-color: #f2f7ff;
      color: var(--primary);
      font-weight: 600;
    }

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

    .review-content {
      font-size: 0.95rem;
      color: var(--text-regular);
      margin-bottom: 20px;
      font-style: italic;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f0f3f8;
      padding-top: 14px;
    }

    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #e2eaf7;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .author-meta h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-meta p {
      font-size: 0.8rem;
      color: var(--text-secondary);
    }

    /* FAQ Accordion */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item:hover {
      border-color: #cbdcf8;
    }

    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 1.05rem;
      color: var(--text-main);
      background: none;
      border: none;
      width: 100%;
      text-align: left;
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--text-secondary);
      transition: transform 0.3s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      padding: 0 24px;
      color: var(--text-regular);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      max-height: 500px;
      padding-bottom: 20px;
    }

    /* Form Section */
    .form-container-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

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

    .form-group label {
      display: block;
      font-size: 0.95rem;
      font-weight: 600;
      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;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
      background: #fdfdfd;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(0, 82, 217, 0.1);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* Articles Section */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .article-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }

    .article-badge {
      font-size: 0.75rem;
      color: var(--primary);
      background: #eaf1fc;
      padding: 2px 8px;
      border-radius: 4px;
      width: fit-content;
      margin-bottom: 12px;
      font-weight: 600;
    }

    .article-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .article-desc {
      font-size: 0.9rem;
      color: var(--text-regular);
      flex-grow: 1;
      margin-bottom: 16px;
    }

    .article-link {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary);
    }

    /* Contact Info Boxes */
    .contact-info-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .contact-item-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }

    .contact-item-icon {
      font-size: 1.5rem;
      color: var(--primary);
    }

    .contact-item-text h4 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 4px;
    }

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

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

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

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

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

    .footer-links li {
      margin-bottom: 10px;
    }

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

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

    .footer-qrcode-box {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 8px;
    }

    .footer-qrcode-box img {
      width: 100px;
      height: 100px;
      border-radius: var(--radius-sm);
      background: #ffffff;
      padding: 4px;
    }

    .footer-friendlinks {
      border-top: 1px solid #1e293b;
      padding: 24px 0;
      font-size: 0.85rem;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
    }

    .footer-friendlinks a {
      color: #64748b;
    }

    .footer-friendlinks a:hover {
      color: #38bdf8;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* Floating Widget */
    .floating-tools {
      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: 0 4px 14px rgba(0, 0, 0, 0.15);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      cursor: pointer;
      font-weight: 700;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-3px);
    }

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

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 24px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .header-actions {
        display: none;
      }
      .hero-title {
        font-size: 2.1rem;
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
      }
      .metric-item:nth-child(2) {
        border-right: none;
      }
      .grid-3, .grid-2, .articles-grid, .contact-info-list {
        grid-template-columns: 1fr;
      }
      .visual-showcase-box {
        grid-template-columns: 1fr;
      }
      .rating-header-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }