:root {
      --primary: #4f46e5;
      --primary-light: #6366f1;
      --accent-pink: #ec4899;
      --accent-cyan: #06b6d4;
      --accent-amber: #f59e0b;
      --accent-green: #10b981;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-soft: #64748b;
      --border-color: #e2e8f0;
      --border-focus: #c7d2fe;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
      --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --container-max: 1240px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(at 0% 0%, rgba(79, 70, 229, 0.04) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(236, 72, 153, 0.04) 0px, transparent 50%);
      background-attachment: fixed;
    }

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

    ul, ol {
      list-style: none;
    }

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

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

    .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 var(--border-color);
    }

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

    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }

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

    .brand-text {
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      color: #1e1b4b;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-muted);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      display: block;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background-color: #eef2ff;
    }

    .nav-action {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-full);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #4f46e5 0%, #ec4899 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px 0 rgba(79, 70, 229, 0.35);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #4338ca 0%, #db2777 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px 0 rgba(79, 70, 229, 0.45);
      color: #ffffff;
    }

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

    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: #f5f3ff;
      transform: translateY(-2px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      font-size: 1.1rem;
      color: var(--text-main);
    }

    .hero-section {
      position: relative;
      padding: 90px 0 80px;
      background: linear-gradient(180deg, rgba(238, 242, 255, 0.8) 0%, rgba(253, 242, 248, 0.5) 50%, #ffffff 100%);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .hero-wrap {
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: linear-gradient(90deg, #eef2ff, #fdf2f8);
      color: #4338ca;
      font-weight: 700;
      font-size: 0.88rem;
      padding: 6px 18px;
      border-radius: var(--radius-full);
      border: 1px solid #c7d2fe;
      margin-bottom: 24px;
      animation: pulseGlow 3s infinite alternate;
    }

    @keyframes pulseGlow {
      0% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.2); }
      100% { box-shadow: 0 0 16px 2px rgba(236, 72, 153, 0.25); }
    }

    .hero-title {
      font-size: clamp(2.2rem, 5vw, 3.4rem);
      font-weight: 900;
      line-height: 1.25;
      letter-spacing: -0.03em;
      margin-bottom: 22px;
      color: #111827;
    }

    .hero-desc {
      font-size: clamp(1.05rem, 2vw, 1.25rem);
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 36px;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-btns {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 54px;
    }

    .btn-hero-primary {
      padding: 14px 36px;
      font-size: 1.1rem;
      font-weight: 700;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 10px;
    }

    .metric-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #cbd5e1;
    }

    .metric-number {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
      display: block;
      font-variant-numeric: tabular-nums;
    }

    .metric-label {
      font-size: 0.88rem;
      color: var(--text-soft);
      font-weight: 600;
    }

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

    .ticker-title {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--text-soft);
      text-align: center;
      margin-bottom: 14px;
    }

    .tags-container {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }

    .model-tag {
      background: #f1f5f9;
      color: #334155;
      font-size: 0.8rem;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: var(--radius-full);
      border: 1px solid #e2e8f0;
      transition: all 0.2s ease;
    }

    .model-tag:hover {
      background: #eef2ff;
      color: var(--primary);
      border-color: #c7d2fe;
    }

    .section-block {
      padding: 80px 0;
    }

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

    .section-subtitle {
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--accent-pink);
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 8px;
      display: inline-block;
    }

    .section-heading {
      font-size: 2.2rem;
      font-weight: 800;
      color: #0f172a;
      line-height: 1.3;
      margin-bottom: 14px;
    }

    .section-description {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .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: 30px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-xl);
      border-color: #cbd5e1;
    }

    .feature-icon-badge {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.2rem;
      margin-bottom: 20px;
    }

    .bg-icon-indigo { background: #e0e7ff; color: #4338ca; }
    .bg-icon-pink { background: #fce7f3; color: #db2777; }
    .bg-icon-amber { background: #fef3c7; color: #d97706; }
    .bg-icon-cyan { background: #cffafe; color: #0891b2; }
    .bg-icon-green { background: #d1fae5; color: #059669; }
    .bg-icon-purple { background: #f3e8ff; color: #7e22ce; }

    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: #1e293b;
      margin-bottom: 12px;
    }

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

    .scene-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 20px;
    }

    .scene-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      transition: all 0.25s ease;
    }

    .scene-item:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

    .scene-item h4 {
      font-size: 1.1rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 8px;
    }

    .scene-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    .compare-container {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

    .compare-header {
      background: linear-gradient(135deg, #1e1b4b, #312e81);
      color: #ffffff;
      padding: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-badge {
      background: rgba(255, 255, 255, 0.15);
      border: 1px solid rgba(255, 255, 255, 0.3);
      padding: 10px 20px;
      border-radius: var(--radius-md);
      text-align: right;
    }

    .score-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: #fde047;
      line-height: 1;
    }

    .score-stars {
      color: #fde047;
      font-size: 1.1rem;
      margin-top: 4px;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
    }

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

    .compare-table th,
    .compare-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

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

    .compare-table tr:hover td {
      background-color: #faf5ff;
    }

    .tag-yes {
      display: inline-block;
      padding: 4px 10px;
      background: #dcfce7;
      color: #166534;
      font-weight: 700;
      font-size: 0.85rem;
      border-radius: var(--radius-full);
    }

    .tag-no {
      display: inline-block;
      padding: 4px 10px;
      background: #f1f5f9;
      color: #64748b;
      font-size: 0.85rem;
      border-radius: var(--radius-full);
    }

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

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

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: var(--radius-full);
      background: linear-gradient(135deg, #4f46e5, #ec4899);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      margin-bottom: 14px;
    }

    .step-item h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: #0f172a;
    }

    .step-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .media-card .img-wrap {
      aspect-ratio: 16/9;
      background: #e2e8f0;
      overflow: hidden;
    }

    .media-card .img-wrap-square {
      aspect-ratio: 1/1;
    }

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

    .media-card:hover img {
      transform: scale(1.05);
    }

    .media-content {
      padding: 20px;
      flex-grow: 1;
    }

    .media-content h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .media-content p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-quote {
      font-size: 0.95rem;
      color: #334155;
      line-height: 1.6;
      margin-bottom: 20px;
      font-style: italic;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 16px;
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-full);
      background: #e0e7ff;
      color: #4338ca;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
    }

    .author-info h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: #0f172a;
    }

    .author-info span {
      font-size: 0.8rem;
      color: var(--text-soft);
    }

    .faq-container {
      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 {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: none;
      border: none;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1.05rem;
      font-weight: 700;
      color: #1e293b;
    }

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

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background-color: #f8fafc;
    }

    .faq-answer-inner {
      padding: 16px 24px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .form-panel {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-xl);
      padding: 40px;
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      align-items: start;
    }

    .contact-info-wrap h3 {
      font-size: 1.6rem;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 16px;
    }

    .contact-info-wrap p {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 24px;
      line-height: 1.6;
    }

    .contact-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-bottom: 24px;
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      color: #334155;
    }

    .contact-item strong {
      color: #0f172a;
      width: 100px;
      flex-shrink: 0;
    }

    .qr-box {
      background: #f8fafc;
      border: 1px dashed var(--border-color);
      padding: 16px;
      border-radius: var(--radius-md);
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      border-radius: 6px;
    }

    .qr-box span {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-muted);
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: #1e293b;
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      color: #0f172a;
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      outline: none;
      transition: all 0.2s ease;
    }

    .form-control:focus {
      background: #ffffff;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }

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

    .network-badge-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 14px;
    }

    .network-badge {
      background: #f1f5f9;
      padding: 8px 16px;
      border-radius: var(--radius-full);
      font-size: 0.88rem;
      font-weight: 600;
      color: #334155;
    }

    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-link-tag {
      background: #eef2ff;
      color: #4338ca;
      font-size: 0.85rem;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: var(--radius-full);
      border: 1px solid #c7d2fe;
    }

    .article-link-tag:hover {
      background: #4338ca;
      color: #ffffff;
    }

    .site-footer {
      background: #0f172a;
      color: #cbd5e1;
      padding: 60px 0 30px;
      margin-top: 60px;
      border-top: 1px solid #1e293b;
    }

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

    .footer-brand h4 {
      font-size: 1.3rem;
      font-weight: 800;
      color: #ffffff;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      color: #94a3b8;
      line-height: 1.6;
      max-width: 320px;
    }

    .footer-col h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
      letter-spacing: 0.05em;
    }

    .footer-col ul {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-col a {
      color: #94a3b8;
      font-size: 0.88rem;
    }

    .footer-col a:hover {
      color: #ffffff;
      padding-left: 4px;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.85rem;
      color: #64748b;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }

    .friend-links a {
      color: #94a3b8;
      font-size: 0.85rem;
    }

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

    .float-widgets {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      z-index: 999;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: var(--radius-full);
      background: #ffffff;
      color: var(--primary);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      cursor: pointer;
      transition: all 0.25s ease;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.08);
    }

    @media (max-width: 1024px) {
      .grid-4, .step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-content {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        padding: 10px 0;
        width: 100%;
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-2, .grid-3 {
        grid-template-columns: 1fr;
      }
      .step-list {
        grid-template-columns: 1fr;
      }
      .footer-content {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }