:root {
      --primary: #8b5cf6;
      --primary-gradient: linear-gradient(135deg, #a855f7 0%, #6366f1 50%, #06b6d4 100%);
      --holo-glow: linear-gradient(135deg, rgba(236,72,153,0.15), rgba(168,85,247,0.15), rgba(59,130,246,0.15));
      --holo-border: linear-gradient(135deg, #f472b6, #a855f7, #38bdf8);
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
      --shadow-holo: 0 10px 30px -5px rgba(168, 85, 247, 0.15);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.9);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: all 0.3s ease;
    }

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

    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

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

    .brand-name {
      font-size: 20px;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* Requirement: .nav-links gap set to 0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-main);
      text-decoration: none;
      font-size: 14px;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }

    .nav-links a:hover {
      color: var(--primary);
      background: rgba(168, 85, 247, 0.08);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 9999px;
      text-decoration: none;
      cursor: pointer;
      transition: all 0.3s ease;
      border: none;
    }

    .btn-holo {
      background: var(--primary-gradient);
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(168, 85, 247, 0.3);
    }

    .btn-holo:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(168, 85, 247, 0.45);
    }

    .btn-outline {
      background: transparent;
      color: var(--text-main);
      border: 1px solid rgba(168, 85, 247, 0.4);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      background: rgba(168, 85, 247, 0.08);
    }

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

    /* 首屏 HERO 区域 - 严禁出现图片 */
    .hero-section {
      padding: 80px 0 60px 0;
      background: radial-gradient(circle at 50% 20%, rgba(236,72,153,0.08) 0%, rgba(168,85,247,0.05) 40%, transparent 70%);
      position: relative;
    }

    .hero-container {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      border-radius: 9999px;
      background: var(--holo-glow);
      border: 1px solid rgba(168, 85, 247, 0.3);
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
      animation: pulse 3s infinite;
    }

    .hero-title {
      font-size: 38px;
      font-weight: 900;
      letter-spacing: -0.5px;
      line-height: 1.25;
      margin-bottom: 20px;
      color: var(--text-main);
    }

    .hero-title span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
      padding: 24px;
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-holo);
    }

    .stat-item h3 {
      font-size: 28px;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .stat-item p {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 区块通用结构 */
    .section-padding {
      padding: 80px 0;
    }

    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 50px auto;
    }

    .section-tag {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      margin-bottom: 10px;
      display: block;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      margin-bottom: 14px;
      color: var(--text-main);
    }

    .section-subtitle {
      font-size: 15px;
      color: var(--text-muted);
    }

    /* 网格与卡片 */
    .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: 30px;
    }

    .card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 28px;
      border: 1px solid var(--border-color);
      transition: all 0.3s ease;
      position: relative;
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-holo);
      border-color: rgba(168, 85, 247, 0.4);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-md);
      background: var(--holo-glow);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 18px;
      color: var(--primary);
      border: 1px solid rgba(168, 85, 247, 0.2);
    }

    .card-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
    }

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

    /* 标签云模型列 */
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 16px;
    }

    .tag-pill {
      background: #f1f5f9;
      color: #334155;
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 9999px;
      border: 1px solid #e2e8f0;
      transition: all 0.2s ease;
    }

    .tag-pill:hover {
      background: var(--primary-gradient);
      color: #ffffff;
      border-color: transparent;
    }

    /* 对比评测高亮板块 */
    .eval-box {
      background: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(248,250,252,0.95));
      border: 2px solid rgba(168, 85, 247, 0.3);
      border-radius: 20px;
      padding: 36px;
      box-shadow: var(--shadow-holo);
    }

    .score-badge {
      display: flex;
      align-items: center;
      gap: 20px;
      background: var(--holo-glow);
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(168, 85, 247, 0.2);
      margin-bottom: 24px;
    }

    .score-num {
      font-size: 46px;
      font-weight: 900;
      color: #9333ea;
      line-height: 1;
    }

    .stars {
      color: #f59e0b;
      font-size: 20px;
    }

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

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      margin-top: 20px;
    }

    .custom-table th, .custom-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    .custom-table th {
      background: #f1f5f9;
      font-weight: 700;
    }

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

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

    .step-num {
      font-size: 36px;
      font-weight: 900;
      color: rgba(168, 85, 247, 0.25);
      position: absolute;
      top: 15px;
      right: 15px;
    }

    /* FAQ 折叠 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.2s ease;
    }

    .faq-question {
      padding: 20px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 16px;
    }

    .faq-answer {
      padding: 0 20px 20px 20px;
      color: var(--text-muted);
      font-size: 14px;
      display: none;
    }

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

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

    /* 表单组件 */
    .form-wrapper {
      background: var(--bg-card);
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-holo);
    }

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

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      font-size: 14px;
      outline: none;
      transition: all 0.2s ease;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.15);
    }

    /* 常见案例与展示图控制 */
    .ai-page-image {
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      width: 100%;
      height: 220px;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .ai-page-image:hover {
      transform: scale(1.02);
    }

    /* 浮动客服 */
    .floating-kefu {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 12px;
      box-shadow: 0 10px 30px rgba(0,0,0,0.15);
      border: 1px solid var(--border-color);
      text-align: center;
      max-width: 150px;
    }

    .floating-kefu img {
      width: 100px;
      height: 100px;
      border-radius: var(--radius-sm);
      margin-bottom: 6px;
    }

    .floating-kefu p {
      font-size: 12px;
      font-weight: 700;
      color: var(--primary);
    }

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

    .footer a {
      color: #cbd5e1;
      text-decoration: none;
      transition: color 0.2s ease;
    }

    .footer a:hover {
      color: #c084fc;
    }

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

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

    .friend-links a {
      font-size: 13px;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
    }

    .copyright {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
    }

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

    @media (max-width: 768px) {
      .hero-title { font-size: 28px; }
      .hero-stats { grid-template-columns: repeat(2, 1fr); }
      .grid-3, .grid-2 { grid-template-columns: 1fr; }
      .grid-4, .steps-grid { grid-template-columns: 1fr; }
      .mobile-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      }
      .nav-links.show { display: flex; }
      .footer-grid { grid-template-columns: 1fr; }
      .floating-kefu { display: none; }
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.7; }
    }