:root {
      --c-bg: #f8fafc;
      --c-surface: #ffffff;
      --c-text-main: #0f172a;
      --c-text-muted: #475569;
      --c-text-light: #64748b;
      --c-border: #e2e8f0;
      --c-border-light: #f1f5f9;
      --c-primary: #3b82f6;
      --c-accent-pink: #ec4899;
      --c-accent-amber: #f59e0b;
      --c-accent-emerald: #10b981;
      --c-accent-violet: #8b5cf6;
      --c-accent-cyan: #06b6d4;
      --g-rainbow: linear-gradient(135deg, #ec4899 0%, #8b5cf6 25%, #3b82f6 50%, #06b6d4 75%, #10b981 100%);
      --g-rainbow-light: linear-gradient(135deg, rgba(236,72,153,0.06) 0%, rgba(139,92,246,0.06) 30%, rgba(59,130,246,0.06) 70%, rgba(16,185,129,0.06) 100%);
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
      --shadow-rainbow: 0 10px 25px -5px rgba(139, 92, 246, 0.2);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-full: 9999px;
      --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-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(--c-bg);
      color: var(--c-text-main);
      line-height: 1.6;
      background-image: 
        radial-gradient(circle at 10% 20%, rgba(236, 72, 153, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 90% 40%, rgba(59, 130, 246, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 30% 80%, rgba(16, 185, 129, 0.03) 0%, transparent 40%);
      background-attachment: fixed;
    }

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

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .section {
      padding: 70px 0;
      position: relative;
    }

    .section-title-wrap {
      text-align: center;
      margin-bottom: 45px;
      position: relative;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: var(--radius-full);
      background: var(--g-rainbow-light);
      border: 1px solid rgba(139, 92, 246, 0.2);
      color: var(--c-accent-violet);
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--c-text-main);
      margin-bottom: 12px;
      letter-spacing: -0.02em;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--c-text-muted);
      max-width: 680px;
      margin-left: auto;
      margin-right: auto;
    }

    .rainbow-border {
      position: relative;
      border-radius: var(--radius-lg);
      background: var(--c-surface);
      border: 1px solid var(--c-border);
      transition: var(--transition);
    }

    .rainbow-border:hover {
      border-color: rgba(139, 92, 246, 0.4);
      box-shadow: var(--shadow-rainbow);
      transform: translateY(-2px);
    }

    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--c-border);
    }

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

    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--c-text-main);
    }

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

    .nav-menu {
      display: flex;
      align-items: center;
    }

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

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--c-text-muted);
      border-radius: var(--radius-sm);
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 0.92rem;
      font-weight: 600;
      border-radius: var(--radius-full);
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
      white-space: nowrap;
    }

    .btn-rainbow {
      background: var(--g-rainbow);
      color: #ffffff !important;
      box-shadow: 0 4px 12px rgba(139, 92, 246, 0.25);
    }

    .btn-rainbow:hover {
      opacity: 0.92;
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(139, 92, 246, 0.35);
    }

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

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

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

    /* Hero Section (No Images as required) */
    .hero-section {
      padding: 70px 0 60px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      max-width: 880px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid rgba(236, 72, 153, 0.3);
      border-radius: var(--radius-full);
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--c-accent-pink);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.6rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.03em;
      color: var(--c-text-main);
    }

    .rainbow-text {
      background: var(--g-rainbow);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--c-text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-btns {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }

    .btn-hero-primary {
      padding: 13px 32px;
      font-size: 1.05rem;
      border-radius: var(--radius-full);
    }

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

    .metric-card {
      background: var(--c-surface);
      padding: 22px;
      border-radius: var(--radius-md);
      border: 1px solid var(--c-border);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: left;
    }

    .metric-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
      border-color: rgba(59, 130, 246, 0.3);
    }

    .metric-num {
      font-size: 1.8rem;
      font-weight: 700;
      margin-bottom: 4px;
      display: block;
    }

    .metric-label {
      font-size: 0.85rem;
      color: var(--c-text-light);
    }

    /* Model Badges Strip */
    .model-strip {
      background: #ffffff;
      border-top: 1px solid var(--c-border);
      border-bottom: 1px solid var(--c-border);
      padding: 24px 0;
    }

    .model-strip-inner {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      align-items: center;
    }

    .model-badge {
      background: var(--c-bg);
      border: 1px solid var(--c-border);
      padding: 6px 14px;
      border-radius: var(--radius-full);
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--c-text-muted);
      transition: var(--transition);
    }

    .model-badge:hover {
      border-color: var(--c-accent-violet);
      color: var(--c-accent-violet);
      background: #ffffff;
      transform: scale(1.05);
    }

    /* Card Grids */
    .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: 24px;
    }

    .card {
      background: var(--c-surface);
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--c-border);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }

    .card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: bold;
      color: #ffffff;
      margin-bottom: 16px;
    }

    .card-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--c-text-main);
    }

    .card-desc {
      font-size: 0.9rem;
      color: var(--c-text-muted);
      line-height: 1.6;
    }

    /* Comparison / Rating Box */
    .review-score-banner {
      background: var(--c-surface);
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 1px solid var(--c-border);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
      margin-bottom: 30px;
      box-shadow: var(--shadow-md);
      position: relative;
      overflow: hidden;
    }

    .review-score-banner::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: var(--g-rainbow);
    }

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

    .score-number {
      font-size: 3.6rem;
      font-weight: 800;
      color: var(--c-accent-amber);
      line-height: 1;
    }

    .score-meta h4 {
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .score-stars {
      color: var(--c-accent-amber);
      font-size: 1.2rem;
      letter-spacing: 2px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: var(--c-surface);
      border-radius: var(--radius-md);
      border: 1px solid var(--c-border);
      box-shadow: var(--shadow-sm);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }

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

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

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

    .table-highlight {
      background: rgba(59, 130, 246, 0.03);
      font-weight: 600;
      color: var(--c-primary);
    }

    .badge-tag {
      display: inline-block;
      padding: 2px 8px;
      font-size: 0.75rem;
      font-weight: 600;
      border-radius: 4px;
      background: rgba(16, 185, 129, 0.1);
      color: var(--c-accent-emerald);
    }

    /* Step Timeline */
    .step-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }

    .step-item {
      background: var(--c-surface);
      padding: 24px 18px;
      border-radius: var(--radius-md);
      border: 1px solid var(--c-border);
      text-align: center;
      position: relative;
    }

    .step-idx {
      width: 36px;
      height: 36px;
      line-height: 36px;
      border-radius: 50%;
      background: var(--g-rainbow);
      color: #ffffff;
      font-weight: 700;
      font-size: 0.9rem;
      margin: 0 auto 14px;
    }

    .step-item h4 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-item p {
      font-size: 0.85rem;
      color: var(--c-text-muted);
    }

    /* Media & Cases */
    .media-case-card {
      background: var(--c-surface);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--c-border);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .media-case-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .media-thumb {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #f1f5f9;
      overflow: hidden;
    }

    .media-thumb.square {
      aspect-ratio: 1 / 1;
    }

    .media-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

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

    .media-info {
      padding: 20px;
    }

    .media-info h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .media-info p {
      font-size: 0.85rem;
      color: var(--c-text-muted);
    }

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

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

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

    .testi-meta h4 {
      font-size: 0.95rem;
      font-weight: 700;
    }

    .testi-meta span {
      font-size: 0.8rem;
      color: var(--c-text-light);
    }

    .testi-content {
      font-size: 0.88rem;
      color: var(--c-text-muted);
      line-height: 1.6;
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: var(--c-surface);
      border: 1px solid var(--c-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 22px;
      font-size: 1rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
      color: var(--c-text-light);
    }

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

    .faq-answer {
      display: none;
      padding: 0 22px 18px;
      font-size: 0.9rem;
      color: var(--c-text-muted);
      line-height: 1.65;
      border-top: 1px dashed var(--c-border-light);
      margin-top: 4px;
      padding-top: 12px;
    }

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

    /* Form & Contact */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 32px;
    }

    .form-card {
      background: var(--c-surface);
      padding: 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--c-border);
      box-shadow: var(--shadow-sm);
    }

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

    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--c-text-main);
    }

    .form-control {
      width: 100%;
      padding: 11px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--c-border);
      font-size: 0.92rem;
      color: var(--c-text-main);
      background: #fdfdfd;
      transition: var(--transition);
      outline: none;
    }

    .form-control:focus {
      border-color: var(--c-primary);
      box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
      background: #ffffff;
    }

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

    .contact-info-card {
      background: var(--c-surface);
      padding: 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--c-border);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .qr-box {
      text-align: center;
      padding: 20px;
      background: var(--c-bg);
      border-radius: var(--radius-md);
      border: 1px solid var(--c-border);
      margin-top: 18px;
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      display: block;
      margin: 0 auto 10px;
      border-radius: var(--radius-sm);
    }

    /* Articles & Links */
    .article-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item a {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 14px 18px;
      background: var(--c-surface);
      border: 1px solid var(--c-border);
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      font-weight: 500;
    }

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

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

    .links-cloud a {
      display: inline-block;
      padding: 6px 14px;
      background: var(--c-surface);
      border: 1px solid var(--c-border);
      border-radius: var(--radius-full);
      font-size: 0.85rem;
      color: var(--c-text-muted);
    }

    .links-cloud a:hover {
      color: var(--c-accent-pink);
      border-color: var(--c-accent-pink);
      background: #ffffff;
    }

    /* Site Footer */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--c-border);
      padding: 40px 0 24px;
      color: var(--c-text-muted);
      font-size: 0.88rem;
    }

    .footer-bottom {
      text-align: center;
      padding-top: 20px;
      border-top: 1px solid var(--c-border-light);
      margin-top: 24px;
      color: var(--c-text-light);
    }

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

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--c-surface);
      border: 1px solid var(--c-border);
      box-shadow: var(--shadow-lg);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: var(--transition);
      color: var(--c-text-main);
      font-size: 1.1rem;
    }

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

    /* Responsive */
    @media (max-width: 992px) {
      .grid-4, .hero-metrics-grid, .step-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .review-score-banner {
        flex-direction: column;
        text-align: center;
      }
      .score-left {
        flex-direction: column;
      }
    }

    @media (max-width: 768px) {
      .section {
        padding: 50px 0;
      }
      .hero-title {
        font-size: 2rem;
      }
      .grid-2, .grid-3, .grid-4, .hero-metrics-grid, .step-grid {
        grid-template-columns: 1fr;
      }
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--c-border);
        padding: 20px;
        box-shadow: var(--shadow-lg);
      }
      .nav-menu.active {
        display: block;
      }
      .nav-links {
        flex-direction: column;
        align-items: stretch;
      }
      .nav-links li a {
        padding: 12px 16px;
      }
      .nav-toggle {
        display: block;
      }
      .header-actions .btn-rainbow {
        display: none;
      }
    }