:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --accent-coral: #ff5e62;
      --accent-amber: #f39c12;
      --accent-cyan: #06b6d4;
      --accent-emerald: #10b981;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-base: #f8fafc;
      --bg-surface: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px rgba(148, 163, 184, 0.12);
      --shadow-lg: 0 16px 32px rgba(99, 102, 241, 0.1);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

    * {
      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-base);
      color: var(--text-main);
      line-height: 1.6;
      background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.06) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(255, 94, 98, 0.05) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(6, 182, 212, 0.04) 0px, transparent 60%);
      background-attachment: fixed;
    }

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

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

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: all 0.3s ease;
    }

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

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

    .nav-brand .ai-page-logo {
      height: 42px;
      width: auto;
    }

    .nav-brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary), var(--accent-coral));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: #334155;
      padding: 8px 14px;
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: rgba(79, 70, 229, 0.06);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 22px;
      border-radius: 9999px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #4f46e5 0%, #6366f1 50%, #ff5e62 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
      color: #ffffff;
    }

    .btn-secondary {
      background: #ffffff;
      color: #334155;
      border: 1px solid #cbd5e1;
    }

    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #f8fafc;
      transform: translateY(-2px);
    }

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

    /* 区域通用设置 */
    section {
      padding: 72px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 52px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      padding: 4px 14px;
      border-radius: 9999px;
      background: rgba(79, 70, 229, 0.08);
      color: var(--primary);
      margin-bottom: 12px;
      letter-spacing: 1px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: #0f172a;
      line-height: 1.3;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

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

    /* 首屏 Hero 区域（严禁出现任何图片资源） */
    .hero-section {
      padding: 80px 0 60px;
      overflow: hidden;
      position: relative;
    }

    .hero-layout {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 48px;
      align-items: center;
    }

    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 850;
      line-height: 1.2;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-h1 span {
      background: linear-gradient(135deg, #4f46e5 0%, #ec4899 50%, #f97316 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: #475569;
      line-height: 1.8;
      margin-bottom: 32px;
    }

    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }

    .hero-portal-btn {
      padding: 14px 34px;
      font-size: 1.05rem;
      font-weight: 700;
      background: linear-gradient(135deg, #ff5e62, #ff9966);
      color: #ffffff !important;
      border-radius: 9999px;
      box-shadow: 0 8px 24px rgba(255, 94, 98, 0.4);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      animation: pulseAttention 2.5s infinite;
    }

    @keyframes pulseAttention {
      0%, 100% { transform: scale(1); }
      50% { transform: scale(1.03); }
    }

    .hero-stats-strip {
      display: flex;
      gap: 28px;
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
    }

    .hero-stat-item h4 {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary);
    }

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

    /* 首屏纯代码视觉块 */
    .hero-code-visual {
      background: linear-gradient(160deg, #ffffff 0%, #f1f5f9 100%);
      border: 1px solid rgba(226, 232, 240, 0.8);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }

    .visual-top-bar {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 20px;
      padding-bottom: 12px;
      border-bottom: 1px solid var(--border-color);
    }

    .dot {
      width: 12px;
      height: 12px;
      border-radius: 50%;
    }
    .dot-r { background: #ff5f56; }
    .dot-y { background: #ffbd2e; }
    .dot-g { background: #27c93f; }

    .visual-title {
      font-size: 0.85rem;
      color: var(--text-muted);
      font-family: monospace;
      margin-left: 6px;
    }

    .model-chips-matrix {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 20px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 12px;
      border-radius: 6px;
      font-size: 0.8rem;
      font-weight: 600;
      color: #334155;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: var(--shadow-sm);
    }

    .model-chip::before {
      content: "";
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--accent-emerald);
    }

    .visual-live-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 16px;
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }

    .live-card-header {
      display: flex;
      justify-content: space-between;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .live-status-pill {
      font-size: 0.75rem;
      background: rgba(16, 185, 129, 0.1);
      color: var(--accent-emerald);
      padding: 2px 8px;
      border-radius: 9999px;
    }

    .live-bar {
      height: 6px;
      background: #edf2f7;
      border-radius: 9999px;
      overflow: hidden;
      position: relative;
    }

    .live-bar-fill {
      height: 100%;
      width: 100%;
      background: linear-gradient(90deg, #4f46e5, #06b6d4, #10b981);
      border-radius: 9999px;
    }

    /* 斑斓彩调功能网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
      gap: 24px;
    }

    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .service-card::after {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: linear-gradient(90deg, var(--card-color, #4f46e5), #06b6d4);
      opacity: 0;
      transition: opacity 0.3s;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: transparent;
    }

    .service-card:hover::after {
      opacity: 1;
    }

    .service-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--icon-bg, rgba(79, 70, 229, 0.08));
      color: var(--icon-color, #4f46e5);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.35rem;
      font-weight: bold;
      margin-bottom: 18px;
    }

    .service-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 8px;
    }

    .service-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 平台深度介绍与素材图展示 */
    .showcase-block {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
      margin-bottom: 36px;
    }

    .showcase-grid-two {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }

    .media-card-wrap {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      background: #f1f5f9;
    }

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

    .media-card-wrap:hover img {
      transform: scale(1.02);
    }

    .feature-list-check {
      list-style: none;
      margin-top: 20px;
    }

    .feature-list-check li {
      font-size: 0.95rem;
      color: #334155;
      margin-bottom: 12px;
      display: flex;
      align-items: flex-start;
      gap: 10px;
    }

    .feature-list-check li::before {
      content: "✓";
      display: inline-block;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: rgba(16, 185, 129, 0.15);
      color: var(--accent-emerald);
      text-align: center;
      line-height: 20px;
      font-weight: bold;
      font-size: 0.75rem;
      flex-shrink: 0;
      margin-top: 2px;
    }

    /* 流程步骤 */
    .steps-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

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

    .step-number {
      font-size: 2.2rem;
      font-weight: 850;
      color: rgba(79, 70, 229, 0.15);
      line-height: 1;
      margin-bottom: 12px;
    }

    .step-box h4 {
      font-size: 1.05rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 8px;
    }

    .step-box p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比评测模块 */
    .compare-container {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

    .compare-header-box {
      background: linear-gradient(135deg, #4f46e5 0%, #3b82f6 50%, #06b6d4 100%);
      color: #ffffff;
      padding: 32px;
      text-align: center;
    }

    .compare-score-badge {
      display: inline-flex;
      align-items: baseline;
      gap: 6px;
      background: rgba(255, 255, 255, 0.2);
      backdrop-filter: blur(8px);
      padding: 8px 24px;
      border-radius: 9999px;
      margin-top: 12px;
      border: 1px solid rgba(255, 255, 255, 0.4);
    }

    .compare-score-badge .score-val {
      font-size: 2.4rem;
      font-weight: 850;
      color: #ffd166;
    }

    .compare-score-badge .score-max {
      font-size: 1.1rem;
      opacity: 0.9;
    }

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

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

    .compare-table th, 
    .compare-table td {
      padding: 16px 24px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .compare-table th {
      background: #f8fafc;
      color: #475569;
      font-weight: 700;
    }

    .compare-table td.highlight-col {
      background: rgba(79, 70, 229, 0.03);
      font-weight: 600;
      color: var(--primary);
    }

    /* Token 比价表 */
    .token-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .token-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      transition: all 0.3s;
    }

    .token-card.featured {
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-md);
      position: relative;
    }

    .featured-badge {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: #ffffff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 14px;
      border-radius: 9999px;
    }

    .token-price {
      font-size: 2rem;
      font-weight: 800;
      color: #0f172a;
      margin: 16px 0;
    }

    .token-price span {
      font-size: 0.9rem;
      font-weight: normal;
      color: var(--text-muted);
    }

    /* 宣传图画廊展示 */
    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 36px;
    }

    .banner-thumb {
      border-radius: var(--radius-sm);
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #fff;
    }

    /* 评论卡片网格 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
      gap: 24px;
    }

    .review-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;
    }

    .review-text {
      font-size: 0.95rem;
      color: #334155;
      line-height: 1.6;
      margin-bottom: 18px;
      position: relative;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, #4f46e5, #06b6d4);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

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

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

    /* 文章列表 */
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 14px;
      margin-top: 24px;
    }

    .article-link-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      color: #334155;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .article-link-item:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(79, 70, 229, 0.02);
    }

    /* FAQ 手风琴 */
    .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: 14px;
      overflow: hidden;
      transition: all 0.2s;
    }

    .faq-item:hover {
      border-color: #cbd5e1;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: #0f172a;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

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

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: #475569;
      line-height: 1.7;
      border-top: 1px solid #f8fafc;
    }

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

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

    /* 表单与需求匹配 */
    .contact-form-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: #334155;
      margin-bottom: 8px;
    }

    .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);
      background: #f8fafc;
      transition: all 0.2s;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }

    /* 页脚与收尾体系 */
    .site-footer {
      background: #0f172a;
      color: #cbd5e1;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

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

    .footer-brand h4 {
      font-size: 1.25rem;
      color: #ffffff;
      margin-bottom: 14px;
      font-weight: 700;
    }

    .footer-brand p {
      font-size: 0.9rem;
      color: #94a3b8;
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .footer-col h5 {
      font-size: 1rem;
      color: #ffffff;
      margin-bottom: 16px;
      font-weight: 600;
    }

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

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

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

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

    .footer-qr-block {
      text-align: center;
      background: #1e293b;
      padding: 14px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

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

    .footer-qr-block span {
      font-size: 0.8rem;
      color: #cbd5e1;
      display: block;
    }

    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-top: 24px;
      font-size: 0.85rem;
      color: #64748b;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
    }

    .friend-links-box a {
      color: #94a3b8;
    }

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* 浮动客服栏 */
    .float-dock {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary);
      box-shadow: 0 4px 16px 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 0.2s;
      position: relative;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.05);
    }

    .qr-popover {
      position: absolute;
      right: 58px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      width: 140px;
      text-align: center;
    }

    .float-btn:hover .qr-popover {
      display: block;
    }

    .qr-popover img {
      width: 100%;
      height: auto;
    }

    .qr-popover span {
      font-size: 0.75rem;
      color: #334155;
      margin-top: 6px;
      display: block;
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .hero-layout {
        grid-template-columns: 1fr;
      }
      .showcase-grid-two {
        grid-template-columns: 1fr;
      }
      .steps-row {
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .banner-gallery {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 0;
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .steps-row {
        grid-template-columns: 1fr;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-h1 {
        font-size: 2.1rem;
      }
    }