:root {
      --primary: #F59E0B;
      --primary-hover: #D97706;
      --accent-yellow: #FACC15;
      --accent-light: #FEF08A;
      --accent-glow: rgba(250, 204, 21, 0.25);
      --bg-main: #FAFAFA;
      --bg-card: #FFFFFF;
      --bg-alt: #F4F4F5;
      --bg-dark-section: #18181B;
      --text-main: #18181B;
      --text-muted: #52525B;
      --text-light: #A1A1AA;
      --border-color: #E4E4E7;
      --border-accent: #FDE047;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 12px rgba(245, 158, 11, 0.08), 0 2px 6px rgba(0,0,0,0.04);
      --shadow-lg: 0 10px 25px rgba(245, 158, 11, 0.12), 0 4px 10px rgba(0,0,0,0.05);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --container-width: 1200px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      min-width: 320px;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

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

    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid var(--accent-yellow);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

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

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

    .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .brand-name {
      font-size: 20px;
      font-weight: 800;
      color: #09090B;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .brand-badge {
      font-size: 11px;
      background: var(--accent-yellow);
      color: #000;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 4px;
    }

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

    .nav-item a {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .nav-item a:hover {
      color: #000;
      background: var(--accent-light);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 700;
      font-size: 14px;
      padding: 10px 20px;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }

    .btn-primary {
      background: var(--accent-yellow);
      color: #000;
      border-color: #EAB308;
      box-shadow: 0 4px 12px rgba(250, 204, 21, 0.35);
    }

    .btn-primary:hover {
      background: #FACC15;
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(250, 204, 21, 0.45);
    }

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

    .btn-secondary:hover {
      background: var(--bg-alt);
      border-color: var(--text-muted);
    }

    .btn-dark {
      background: #18181B;
      color: #FFFFFF;
    }

    .btn-dark:hover {
      background: #27272A;
      transform: translateY(-2px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
      padding: 4px;
    }

    /* Hero Section (No Images in Hero) */
    .hero-section {
      background: radial-gradient(circle at 50% 10%, #FEF9C3 0%, #FAFAFA 70%);
      padding: 80px 0 60px;
      text-align: center;
      position: relative;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #FFFFFF;
      border: 2px solid var(--accent-yellow);
      border-radius: 30px;
      font-size: 13px;
      font-weight: 700;
      color: #854D0E;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.25;
      color: #09090B;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-title span {
      background: linear-gradient(120deg, #D97706, #CA8A04);
      -webkit-background-clip: text;
      color: #B45309;
      display: inline-block;
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-cta-group {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 48px;
    }

    .hero-btn-main {
      font-size: 16px;
      padding: 14px 36px;
      background: var(--accent-yellow);
      color: #000;
      font-weight: 800;
      border: 2px solid #EAB308;
      box-shadow: 0 8px 20px rgba(234, 179, 8, 0.4);
    }

    .hero-btn-main:hover {
      background: #FDE047;
      transform: translateY(-3px);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
    }

    .stat-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-top: 4px solid var(--accent-yellow);
      padding: 20px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    .stat-val {
      font-size: 30px;
      font-weight: 800;
      color: #09090B;
      margin-bottom: 4px;
    }

    .stat-lbl {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* Section Global Styles */
    .section {
      padding: 70px 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--bg-alt);
    }

    .section-dark {
      background-color: var(--bg-dark-section);
      color: #FFFFFF;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-badge {
      display: inline-block;
      font-size: 12px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
      padding: 4px 12px;
      background: #FEF08A;
      color: #854D0E;
      border-radius: 4px;
      margin-bottom: 12px;
      border: 1px solid #FDE047;
    }

    .section-dark .section-badge {
      background: rgba(250, 204, 21, 0.2);
      color: var(--accent-yellow);
      border-color: rgba(250, 204, 21, 0.4);
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: #09090B;
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

    .section-dark .section-title {
      color: #FFFFFF;
    }

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

    .section-dark .section-subtitle {
      color: var(--text-light);
    }

    /* Cards & Grids */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

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

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

    .feature-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
    }

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

    .feature-icon {
      width: 48px;
      height: 48px;
      background: #FEF9C3;
      color: #854D0E;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 18px;
      border: 1px solid #FDE047;
    }

    .feature-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: #09090B;
    }

    .feature-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Model Matrix Tags */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-tag {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .model-tag:hover {
      border-color: var(--accent-yellow);
      background: #FEF9C3;
      transform: scale(1.04);
    }

    .model-tag-dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--primary);
    }

    /* Process Flow */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }

    .step-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--accent-yellow);
      color: #000;
      font-weight: 800;
      font-size: 15px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 14px;
      border: 2px solid #EAB308;
    }

    .step-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Comparison Table & Rating */
    .review-score-panel {
      background: linear-gradient(135deg, #FFFBEB 0%, #FEF08A 100%);
      border: 2px solid #FDE047;
      border-radius: var(--radius-lg);
      padding: 36px;
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: var(--shadow-md);
    }

    .score-left h3 {
      font-size: 26px;
      font-weight: 800;
      color: #78350F;
      margin-bottom: 8px;
    }

    .score-left p {
      font-size: 15px;
      color: #92400E;
    }

    .score-right {
      display: flex;
      align-items: center;
      gap: 24px;
      text-align: right;
    }

    .score-num {
      font-size: 48px;
      font-weight: 900;
      color: #B45309;
      line-height: 1;
    }

    .score-stars {
      color: #D97706;
      font-size: 20px;
      font-weight: 800;
    }

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

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

    .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: #09090B;
    }

    .custom-table tr:last-child td {
      border-bottom: none;
    }

    .custom-table .highlight-col {
      background: #FEFCE8;
      font-weight: 700;
      color: #78350F;
      border-left: 1px solid #FEF08A;
      border-right: 1px solid #FEF08A;
    }

    .badge-check {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      color: #15803D;
      font-weight: 700;
    }

    /* Media Visual Gallery */
    .media-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .media-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .media-img-wrap {
      width: 100%;
      background: #E4E4E7;
      overflow: hidden;
    }

    .media-img-wrap img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

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

    .media-content {
      padding: 20px;
    }

    .media-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 6px;
    }

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

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

    .testi-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 16px;
      font-style: normal;
    }

    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 12px;
    }

    .testi-avatar-placeholder {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: var(--accent-light);
      color: #854D0E;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      border: 1px solid var(--accent-yellow);
    }

    .testi-meta-name {
      font-size: 14px;
      font-weight: 700;
      color: #09090B;
    }

    .testi-meta-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 900px;
      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;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      color: #09090B;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FFFFFF;
      user-select: none;
    }

    .faq-icon {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      transition: transform 0.3s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
      background: #FAFAFA;
      border-top: 1px solid transparent;
    }

    .faq-item.active .faq-answer {
      border-top-color: var(--border-color);
      max-height: 400px;
    }

    .faq-answer-inner {
      padding: 18px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Article List Section */
    .news-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }

    .news-card-main {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .news-links-card {
      background: #FEFCE8;
      border: 1px solid #FEF08A;
      border-radius: var(--radius-md);
      padding: 24px;
    }

    .article-item-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 12px 0;
      border-bottom: 1px dashed var(--border-color);
      font-size: 14px;
    }

    .article-item-row:last-child {
      border-bottom: none;
    }

    .article-item-row a:hover {
      color: #B45309;
      text-decoration: underline;
    }

    /* Contact & Form Section */
    .contact-layout {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
      align-items: start;
    }

    .contact-form-wrap {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-top: 4px solid var(--accent-yellow);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 6px;
      color: #09090B;
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--text-main);
      background: #FAFAFA;
      transition: var(--transition);
      outline: none;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--accent-yellow);
      background: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(250, 204, 21, 0.2);
    }

    .contact-info-wrap {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .contact-info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-bottom: 24px;
    }

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 14px;
    }

    .contact-info-icon {
      width: 36px;
      height: 36px;
      background: #FEF9C3;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      color: #854D0E;
    }

    .qr-container {
      text-align: center;
      padding: 20px;
      background: #FAFAFA;
      border: 1px dashed var(--border-color);
      border-radius: var(--radius-md);
    }

    .qr-container img {
      max-width: 140px;
      margin: 0 auto 10px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
    }

    /* Footer */
    .site-footer {
      background: #18181B;
      color: #D4D4D8;
      padding: 60px 0 30px;
      border-top: 4px solid var(--accent-yellow);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-title {
      font-size: 16px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 16px;
      position: relative;
      padding-bottom: 8px;
    }

    .footer-title::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 24px;
      height: 2px;
      background: var(--accent-yellow);
    }

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

    .footer-links a {
      color: #A1A1AA;
      font-size: 13px;
    }

    .footer-links a:hover {
      color: var(--accent-yellow);
      padding-left: 4px;
    }

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

    .friend-links-wrap a {
      font-size: 12px;
      background: #27272A;
      color: #D4D4D8;
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid #3F3F46;
    }

    .friend-links-wrap a:hover {
      background: var(--accent-yellow);
      color: #000;
    }

    .footer-bottom {
      border-top: 1px solid #27272A;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #71717A;
    }

    /* Floating Utilities */
    .float-panel {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #FFFFFF;
      border: 2px solid var(--accent-yellow);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      color: #000;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--accent-yellow);
      transform: scale(1.1);
    }

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

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        border-bottom: 2px solid var(--accent-yellow);
        box-shadow: var(--shadow-lg);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 28px;
      }
      .hero-desc {
        font-size: 15px;
      }
      .grid-3, .grid-2, .news-grid, .contact-layout {
        grid-template-columns: 1fr;
      }
      .process-steps {
        grid-template-columns: 1fr;
      }
      .review-score-panel {
        flex-direction: column;
        gap: 20px;
        text-align: center;
      }
      .score-right {
        justify-content: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }