:root {
      --primary: #5c3bf6;
      --primary-hover: #482cd4;
      --primary-light: #f1edfe;
      --accent-pink: #ff3b81;
      --accent-yellow: #ffc400;
      --accent-cyan: #00d2d3;
      --accent-green: #10b981;
      --text-main: #181928;
      --text-muted: #5e6278;
      --bg-base: #faf9f6;
      --bg-surface: #ffffff;
      --bg-soft: #f4f3ee;
      --border-color: #e4e2db;
      --border-strong: #181928;
      --shadow-solid: 4px 4px 0px #181928;
      --shadow-solid-sm: 2px 2px 0px #181928;
      --shadow-solid-lg: 6px 6px 0px #181928;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --font-sans: -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-sans);
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 10% 20%, rgba(92, 59, 246, 0.04) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(255, 59, 129, 0.04) 0%, transparent 20%),
        radial-gradient(#d6d3c9 1px, transparent 1px);
      background-size: 100% 100%, 100% 100%, 24px 24px;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(250, 249, 246, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--border-strong);
      padding: 12px 0;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: var(--text-main);
    }

    .brand-wrap .ai-page-logo {
      height: 38px;
      width: auto;
      border-radius: var(--radius-sm);
      display: block;
    }

    .brand-wrap .brand-text {
      font-weight: 900;
      font-size: 1.3rem;
      letter-spacing: -0.5px;
      color: var(--text-main);
    }

    .brand-wrap .brand-tag {
      font-size: 0.75rem;
      background: var(--accent-yellow);
      border: 1.5px solid var(--border-strong);
      padding: 1px 6px;
      border-radius: 4px;
      font-weight: bold;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      list-style: none;
    }

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

    .nav-links li a {
      text-decoration: none;
      color: var(--text-main);
      font-size: 0.95rem;
      font-weight: 600;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
      display: inline-block;
    }

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

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-weight: 700;
      font-size: 0.95rem;
      text-decoration: none;
      border-radius: var(--radius-sm);
      border: 2px solid var(--border-strong);
      transition: all 0.15s ease;
      cursor: pointer;
    }

    .btn:hover {
      transform: translate(-2px, -2px);
      box-shadow: var(--shadow-solid);
    }

    .btn:active {
      transform: translate(0, 0);
      box-shadow: none;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
    }

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

    .btn-pink {
      background-color: var(--accent-pink);
      color: #ffffff;
    }

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

    .menu-toggle {
      display: none;
      background: #ffffff;
      border: 2px solid var(--border-strong);
      padding: 6px 10px;
      font-size: 1.2rem;
      font-weight: bold;
      border-radius: var(--radius-sm);
      cursor: pointer;
    }

    /* 首屏无图纯CSS涂鸦风 */
    .hero-section {
      padding: 60px 0 50px 0;
      position: relative;
    }

    .hero-badge-wrap {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
      margin-bottom: 20px;
    }

    .doodle-badge {
      display: inline-flex;
      align-items: center;
      padding: 4px 12px;
      font-size: 0.85rem;
      font-weight: 800;
      border: 2px solid var(--border-strong);
      border-radius: 30px;
      background: #ffffff;
      box-shadow: var(--shadow-solid-sm);
    }

    .doodle-badge.badge-yellow { background: var(--accent-yellow); }
    .doodle-badge.badge-pink { background: var(--accent-pink); color: #fff; }
    .doodle-badge.badge-cyan { background: var(--accent-cyan); }

    .hero-title {
      font-size: clamp(2rem, 4.5vw, 3.2rem);
      font-weight: 900;
      line-height: 1.2;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-title span.highlight {
      background: linear-gradient(180deg, transparent 65%, var(--accent-yellow) 65%);
      display: inline-block;
      padding: 0 4px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 780px;
      margin-bottom: 35px;
      font-weight: 500;
    }

    .hero-cta-group {
      display: flex;
      gap: 15px;
      flex-wrap: wrap;
      align-items: center;
      margin-bottom: 40px;
    }

    .hero-cta-group .btn-lg {
      padding: 14px 32px;
      font-size: 1.1rem;
      box-shadow: var(--shadow-solid);
    }

    .hero-stats-panel {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-solid);
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
    }

    .stat-item {
      padding: 12px;
      border-left: 4px solid var(--primary);
    }

    .stat-item:nth-child(2) { border-left-color: var(--accent-pink); }
    .stat-item:nth-child(3) { border-left-color: var(--accent-yellow); }
    .stat-item:nth-child(4) { border-left-color: var(--accent-cyan); }

    .stat-title {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 4px;
      text-transform: uppercase;
    }

    .stat-val {
      font-size: 1.6rem;
      font-weight: 900;
      color: var(--text-main);
    }

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

    /* 板块通用头部 */
    .section-block {
      padding: 70px 0;
      border-bottom: 1px dashed #d1cebe;
    }

    .section-header {
      text-align: center;
      margin-bottom: 45px;
    }

    .section-header .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 800;
      padding: 3px 10px;
      background: var(--primary-light);
      color: var(--primary);
      border: 1.5px solid var(--border-strong);
      border-radius: 20px;
      margin-bottom: 10px;
      box-shadow: var(--shadow-solid-sm);
    }

    .section-header h2 {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-header p {
      color: var(--text-muted);
      font-size: 1.05rem;
      max-width: 680px;
      margin: 0 auto;
    }

    /* 涂鸦风格卡片 */
    .doodle-card {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-solid);
      transition: all 0.2s ease;
      display: flex;
      flex-direction: column;
    }

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

    .card-icon-box {
      width: 50px;
      height: 50px;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.4rem;
      margin-bottom: 16px;
      background: var(--accent-yellow);
      box-shadow: var(--shadow-solid-sm);
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .card-text {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .card-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .card-tag {
      font-size: 0.75rem;
      padding: 2px 8px;
      border-radius: 4px;
      background: var(--bg-soft);
      border: 1px solid var(--border-color);
      font-weight: 600;
    }

    /* 栅格布局 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
      gap: 20px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      align-items: center;
    }

    /* 平台支持标签墙 */
    .model-pills-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 25px;
    }

    .model-pill {
      background: #ffffff;
      border: 1.5px solid var(--border-strong);
      padding: 6px 14px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 0.9rem;
      box-shadow: var(--shadow-solid-sm);
      transition: all 0.15s ease;
    }

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

    /* 评测对比表 */
    .rating-banner {
      background: linear-gradient(135deg, #fdfbf7 0%, #ffffff 100%);
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-solid-lg);
      margin-bottom: 35px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .score-box {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .score-num {
      font-size: 3.5rem;
      font-weight: 900;
      line-height: 1;
      color: var(--primary);
    }

    .score-stars {
      color: #ff9800;
      font-size: 1.4rem;
      line-height: 1.2;
    }

    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-solid);
    }

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

    .compare-table th, .compare-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .compare-table th {
      background: var(--bg-soft);
      font-weight: 800;
      color: var(--text-main);
      border-bottom: 2px solid var(--border-strong);
    }

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

    .compare-table tr:hover td {
      background-color: #faf9ff;
    }

    .highlight-cell {
      background-color: var(--primary-light) !important;
      font-weight: 700;
      color: var(--primary);
    }

    /* 流程步骤 */
    .step-chain {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-solid);
      position: relative;
    }

    .step-badge {
      display: inline-block;
      background: var(--accent-pink);
      color: #ffffff;
      font-weight: 900;
      padding: 2px 10px;
      border-radius: 4px;
      border: 1.5px solid var(--border-strong);
      font-size: 0.8rem;
      margin-bottom: 12px;
    }

    /* 案例图片流 */
    .media-card {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-solid);
      display: flex;
      flex-direction: column;
    }

    .media-thumb-box {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #f0eee6;
      border-bottom: 2px solid var(--border-strong);
      overflow: hidden;
    }

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

    .media-thumb-box img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      display: block;
      transition: transform 0.3s ease;
    }

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

    .media-content {
      padding: 16px;
    }

    /* 评论卡片 */
    .review-card {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-solid);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-quote {
      font-size: 0.95rem;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed var(--border-color);
      padding-top: 12px;
    }

    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--accent-cyan);
      border: 2px solid var(--border-strong);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.1rem;
    }

    .reviewer-info h4 {
      font-size: 0.95rem;
      font-weight: 800;
    }

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

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-solid-sm);
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 20px;
      font-weight: 800;
      font-size: 1.05rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
      background: #ffffff;
      transition: background 0.15s ease;
    }

    .faq-question:hover {
      background: var(--bg-soft);
    }

    .faq-answer {
      display: none;
      padding: 0 20px 20px 20px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
      border-top: 1px dashed var(--border-color);
      margin-top: 4px;
      padding-top: 14px;
    }

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

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

    .faq-icon {
      font-weight: 900;
      font-size: 1.3rem;
      transition: transform 0.2s ease;
    }

    /* 表单与转化区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 30px;
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-solid-lg);
      overflow: hidden;
    }

    .contact-info-side {
      background: var(--primary-light);
      padding: 35px;
      border-right: 2px solid var(--border-strong);
    }

    .contact-form-side {
      padding: 35px;
    }

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

    .form-group label {
      display: block;
      font-weight: 700;
      font-size: 0.9rem;
      margin-bottom: 6px;
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 14px;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-sm);
      font-family: inherit;
      font-size: 0.95rem;
      outline: none;
      background: var(--bg-base);
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      background: #ffffff;
      border-color: var(--primary);
    }

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

    .qr-box {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-sm);
      padding: 15px;
      display: inline-block;
      text-align: center;
      margin-top: 15px;
      box-shadow: var(--shadow-solid-sm);
    }

    .qr-box img {
      width: 130px;
      height: 130px;
      object-fit: contain;
      display: block;
      margin: 0 auto 8px auto;
    }

    .qr-label {
      font-size: 0.85rem;
      font-weight: 800;
      color: var(--text-main);
    }

    /* 行业资讯 & 链接区 */
    .article-link-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .article-item {
      flex: 1 1 45%;
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-sm);
      padding: 14px 16px;
      text-decoration: none;
      color: var(--text-main);
      font-weight: 600;
      font-size: 0.95rem;
      box-shadow: var(--shadow-solid-sm);
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: all 0.15s ease;
    }

    .article-item:hover {
      background: var(--primary-light);
      transform: translate(-2px, -2px);
    }

    /* 友情链接 */
    .friend-links-box {
      margin-top: 25px;
      padding: 16px 20px;
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-solid-sm);
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 12px;
    }

    .friend-links-box span {
      font-weight: 800;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .friend-links-box a {
      color: var(--text-main);
      text-decoration: none;
      font-size: 0.85rem;
      font-weight: 600;
      background: var(--bg-soft);
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid var(--border-color);
      transition: all 0.15s ease;
    }

    .friend-links-box a:hover {
      background: var(--accent-yellow);
      border-color: var(--border-strong);
    }

    /* 页脚统一规范 */
    .site-footer {
      background-color: #f1efe8;
      border-top: 2px solid var(--border-strong);
      padding: 40px 0 25px 0;
      color: var(--text-main);
    }

    .footer-main-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 30px;
    }

    .footer-col h4 {
      font-size: 1rem;
      font-weight: 800;
      margin-bottom: 14px;
      color: var(--text-main);
    }

    .footer-col ul {
      list-style: none;
    }

    .footer-col ul li {
      margin-bottom: 8px;
    }

    .footer-col ul li a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.15s ease;
    }

    .footer-col ul li a:hover {
      color: var(--primary);
      text-decoration: underline;
    }

    .footer-bottom {
      border-top: 1px dashed #d1cebe;
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 15px;
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 悬浮客服挂件 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: 50%;
      box-shadow: var(--shadow-solid);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      cursor: pointer;
      text-decoration: none;
      color: var(--text-main);
      font-weight: 900;
      transition: transform 0.2s ease;
      position: relative;
    }

    .float-btn:hover {
      transform: scale(1.1);
      background: var(--accent-yellow);
    }

    .float-btn.back-top {
      display: none;
    }

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

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

    .qr-tooltip p {
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

    /* 响应式调整 */
    @media (max-width: 992px) {
      .footer-main-grid {
        grid-template-columns: 1fr 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .contact-info-side {
        border-right: none;
        border-bottom: 2px solid var(--border-strong);
      }
      .grid-2 {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 2px solid var(--border-strong);
        padding: 15px 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.08);
      }
      .nav-menu.active {
        display: block;
      }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
        border-bottom: 1px solid var(--border-color);
      }
      .footer-main-grid {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        align-items: flex-start;
      }
      .article-item {
        flex: 1 1 100%;
      }
    }