:root {
      --primary: #5c3bf6;
      --primary-hover: #4829db;
      --accent-yellow: #ffc93c;
      --accent-pink: #ff6b81;
      --accent-cyan: #00d2d3;
      --accent-green: #10ac84;
      --text-dark: #1e272e;
      --text-muted: #576574;
      --bg-cream: #faf9f6;
      --bg-card: #ffffff;
      --border-dark: #222f3e;
      --shadow-neo: 4px 4px 0px #222f3e;
      --shadow-neo-lg: 6px 6px 0px #222f3e;
      --shadow-neo-hover: 2px 2px 0px #222f3e;
      --radius-neo: 16px;
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

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

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

    body {
      font-family: var(--font-stack);
      background-color: var(--bg-cream);
      color: var(--text-dark);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: radial-gradient(#d1d8e0 1.2px, transparent 1.2px);
      background-size: 24px 24px;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    /* 顶部导航 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(250, 249, 246, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--border-dark);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

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

    .brand-wrap .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }

    .brand-name {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--text-dark);
      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: 600;
      color: var(--text-dark);
      padding: 8px 14px;
      border-radius: 8px;
      transition: all 0.2s ease;
      display: inline-block;
    }

    .nav-links li a:hover {
      background-color: var(--accent-yellow);
      color: var(--text-dark);
      transform: translateY(-2px);
    }

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

    .btn-main {
      background-color: var(--primary);
      color: #ffffff;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 700;
      border: 2px solid var(--border-dark);
      border-radius: 30px;
      box-shadow: var(--shadow-neo);
      transition: all 0.2s ease;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-main:hover {
      background-color: var(--primary-hover);
      transform: translate(2px, 2px);
      box-shadow: var(--shadow-neo-hover);
    }

    .btn-yellow {
      background-color: var(--accent-yellow);
      color: var(--text-dark);
    }

    .btn-yellow:hover {
      background-color: #ffd460;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 2px solid var(--border-dark);
      border-radius: 8px;
      padding: 6px 10px;
      font-size: 1.2rem;
      cursor: pointer;
    }

    /* Section 通用样式 */
    section {
      padding: 80px 0;
      position: relative;
    }

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

    .section-tag {
      display: inline-block;
      padding: 6px 16px;
      background-color: var(--accent-cyan);
      border: 2px solid var(--border-dark);
      border-radius: 20px;
      font-weight: 800;
      font-size: 0.85rem;
      margin-bottom: 14px;
      box-shadow: 2px 2px 0px var(--border-dark);
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--text-dark);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 首屏 Hero (无图片) */
    .hero-section {
      padding: 80px 0 60px 0;
      background: linear-gradient(180deg, rgba(92, 59, 246, 0.06) 0%, transparent 100%);
    }

    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-badge-wrap {
      margin-bottom: 20px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background-color: var(--accent-yellow);
      border: 2px solid var(--border-dark);
      padding: 8px 18px;
      border-radius: 30px;
      font-size: 0.95rem;
      font-weight: 800;
      box-shadow: var(--shadow-neo);
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 950;
      line-height: 1.25;
      color: var(--text-dark);
      margin-bottom: 24px;
    }

    .hero-title span {
      background: linear-gradient(120deg, var(--accent-pink) 0%, var(--primary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .hero-actions .btn-main {
      padding: 14px 34px;
      font-size: 1.1rem;
    }

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

    .stat-card {
      background-color: var(--bg-card);
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-neo);
      padding: 24px 16px;
      box-shadow: var(--shadow-neo);
      text-align: center;
      transition: transform 0.2s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
    }

    .stat-value {
      font-size: 2rem;
      font-weight: 900;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-dark);
    }

    /* 平台矩阵与聚合标签 */
    .model-marquee-section {
      padding: 20px 0 60px 0;
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 12px;
    }

    .model-chip {
      background-color: var(--bg-card);
      border: 2px solid var(--border-dark);
      padding: 8px 16px;
      border-radius: 12px;
      font-size: 0.9rem;
      font-weight: 700;
      box-shadow: 2px 2px 0px var(--border-dark);
      transition: all 0.2s;
    }

    .model-chip:hover {
      background-color: var(--accent-cyan);
      transform: translateY(-2px);
    }

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

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

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

    .neo-card {
      background-color: var(--bg-card);
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-neo);
      padding: 30px 24px;
      box-shadow: var(--shadow-neo);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .neo-card:hover {
      transform: translate(-3px, -3px);
      box-shadow: var(--shadow-neo-lg);
    }

    .card-icon {
      width: 52px;
      height: 52px;
      border: 2px solid var(--border-dark);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      box-shadow: 2px 2px 0px var(--border-dark);
    }

    .icon-bg-yellow { background-color: var(--accent-yellow); }
    .icon-bg-pink { background-color: var(--accent-pink); }
    .icon-bg-cyan { background-color: var(--accent-cyan); }
    .icon-bg-green { background-color: var(--accent-green); color: #fff; }
    .icon-bg-purple { background-color: #a29bfe; }

    .card-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-dark);
      margin-bottom: 12px;
    }

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

    /* 流程步骤 */
    .step-item {
      position: relative;
      background-color: var(--bg-card);
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-neo);
      padding: 28px 20px;
      box-shadow: var(--shadow-neo);
      text-align: center;
    }

    .step-num {
      width: 44px;
      height: 44px;
      line-height: 40px;
      margin: 0 auto 16px auto;
      background-color: var(--accent-pink);
      color: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: 50%;
      font-weight: 900;
      font-size: 1.2rem;
      box-shadow: 2px 2px 0px var(--border-dark);
    }

    /* 对比评测表格与卡片 */
    .review-highlight {
      background-color: #fff9e6;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-neo);
      padding: 30px;
      box-shadow: var(--shadow-neo);
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-badge {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .score-num {
      font-size: 3.2rem;
      font-weight: 950;
      color: var(--primary);
    }

    .score-max {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-muted);
    }

    .table-container {
      overflow-x: auto;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-neo);
      box-shadow: var(--shadow-neo);
      background-color: var(--bg-card);
    }

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

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #e0e0e0;
      font-size: 0.95rem;
    }

    .compare-table th {
      background-color: #f1f2f6;
      font-weight: 800;
      color: var(--text-dark);
      border-bottom: 2px solid var(--border-dark);
    }

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

    .highlight-col {
      background-color: #f8f6ff;
      font-weight: 700;
      color: var(--primary);
    }

    /* 素材图片展示卡片 */
    .image-card {
      background-color: var(--bg-card);
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-neo);
      overflow: hidden;
      box-shadow: var(--shadow-neo);
      display: flex;
      flex-direction: column;
    }

    .image-card-img-wrap {
      width: 100%;
      background-color: #eee;
      position: relative;
    }

    .image-card-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    .image-card-body {
      padding: 20px;
      flex-grow: 1;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background-color: var(--bg-card);
      border: 2px solid var(--border-dark);
      border-radius: 12px;
      box-shadow: var(--shadow-neo);
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 800;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background-color: var(--bg-card);
      user-select: none;
    }

    .faq-question:hover {
      background-color: #f8f9fa;
    }

    .faq-icon {
      font-size: 1.2rem;
      font-weight: 900;
      transition: transform 0.2s ease;
    }

    .faq-answer {
      padding: 0 24px 20px 24px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      display: none;
      border-top: 1px dashed #e0e0e0;
      margin-top: 10px;
      padding-top: 16px;
    }

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

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

    /* 用户评论 */
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 18px;
    }

    .review-avatar {
      width: 44px;
      height: 44px;
      border: 2px solid var(--border-dark);
      border-radius: 50%;
      background-color: var(--accent-yellow);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1rem;
    }

    .review-name {
      font-weight: 800;
      font-size: 0.95rem;
      color: var(--text-dark);
    }

    .review-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 表单区域 */
    .form-container {
      background-color: var(--bg-card);
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-neo);
      padding: 40px;
      box-shadow: var(--shadow-neo-lg);
      max-width: 800px;
      margin: 0 auto;
    }

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

    .form-label {
      display: block;
      font-weight: 800;
      font-size: 0.95rem;
      margin-bottom: 8px;
      color: var(--text-dark);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 2px solid var(--border-dark);
      border-radius: 10px;
      font-size: 0.95rem;
      font-family: inherit;
      background-color: #ffffff;
      outline: none;
      transition: all 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 2px 2px 0px var(--primary);
    }

    textarea.form-control {
      min-height: 120px;
      resize: vertical;
    }

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

    /* 最新文章与外链区 */
    .articles-block {
      background-color: var(--bg-card);
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-neo);
      padding: 24px;
      box-shadow: var(--shadow-neo);
    }

    .article-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 14px;
    }

    .article-links-list li a {
      color: var(--primary);
      font-weight: 600;
      text-decoration: underline;
      word-break: break-all;
    }

    /* 底部 Footer */
    .main-footer {
      background-color: #1e272e;
      color: #f5f6fa;
      border-top: 3px solid var(--border-dark);
      padding: 60px 0 30px 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.15rem;
      font-weight: 800;
      margin-bottom: 20px;
      position: relative;
    }

    .footer-col p {
      color: #d2dae2;
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 12px;
    }

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

    .footer-links li a {
      color: #d2dae2;
      font-size: 0.9rem;
      transition: color 0.2s;
    }

    .footer-links li a:hover {
      color: var(--accent-yellow);
    }

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

    .friend-links-wrap a {
      color: #d2dae2;
      font-size: 0.85rem;
      background: rgba(255,255,255,0.08);
      padding: 4px 10px;
      border-radius: 6px;
      transition: all 0.2s;
    }

    .friend-links-wrap a:hover {
      background: var(--primary);
      color: #fff;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      text-align: center;
      color: #808e9b;
      font-size: 0.85rem;
    }

    /* 悬浮客服面板 */
    .float-contact {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      background-color: var(--accent-yellow);
      border: 2px solid var(--border-dark);
      border-radius: 50%;
      box-shadow: var(--shadow-neo);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1.2rem;
      position: relative;
    }

    .float-qr-pop {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: 12px;
      padding: 12px;
      box-shadow: var(--shadow-neo);
      display: none;
      width: 160px;
      text-align: center;
    }

    .float-qr-pop img {
      width: 100%;
      height: auto;
      display: block;
      margin-bottom: 6px;
    }

    .float-qr-pop p {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--text-dark);
    }

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

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-stat-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 2px solid var(--border-dark);
        flex-direction: column;
        padding: 16px;
        gap: 0;
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 2rem;
      }
      .grid-3, .grid-2, .grid-4 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .review-highlight {
        flex-direction: column;
        align-items: flex-start;
      }
    }