:root {
      --bg-page: #FFFDF9;
      --bg-card: #FFFFFF;
      --text-main: #1D2129;
      --text-muted: #5A607F;
      --text-sub: #7A829E;
      --color-black: #1E2022;
      --color-yellow: #FFD028;
      --color-pink: #FF4B72;
      --color-cyan: #00D2D3;
      --color-purple: #7952DE;
      --color-green: #10B981;
      --color-blue: #2563EB;
      --color-orange: #FF7E36;
      --border-thick: 2.5px solid #1E2022;
      --shadow-doodle: 4px 4px 0px #1E2022;
      --shadow-doodle-lg: 6px 6px 0px #1E2022;
      --shadow-doodle-hover: 2px 2px 0px #1E2022;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-pill: 999px;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      background-color: var(--bg-page);
      background-image: 
        radial-gradient(var(--color-yellow) 0.75px, transparent 0.75px),
        radial-gradient(var(--color-cyan) 0.75px, var(--bg-page) 0.75px);
      background-size: 36px 36px;
      background-position: 0 0, 18px 18px;
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      min-height: 100vh;
    }

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

    .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: 999;
      background: rgba(255, 253, 249, 0.94);
      backdrop-filter: blur(10px);
      border-bottom: var(--border-thick);
    }

    .header-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(--color-black);
      letter-spacing: -0.5px;
      background: var(--color-yellow);
      padding: 2px 8px;
      border-radius: var(--radius-sm);
      border: 2px solid var(--color-black);
      box-shadow: 2px 2px 0 var(--color-black);
    }

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

    .nav-links li a {
      font-weight: 700;
      font-size: 0.92rem;
      color: var(--color-black);
      padding: 8px 10px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
      white-space: nowrap;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.95rem;
      padding: 10px 20px;
      border-radius: var(--radius-md);
      border: var(--border-thick);
      box-shadow: var(--shadow-doodle);
      cursor: pointer;
      transition: all 0.15s ease;
      text-align: center;
    }

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

    .btn:active {
      transform: translate(4px, 4px);
      box-shadow: none;
    }

    .btn-primary {
      background-color: var(--color-yellow);
      color: var(--color-black);
    }

    .btn-portal {
      background-color: var(--color-pink);
      color: #FFFFFF;
    }

    .btn-cyan {
      background-color: var(--color-cyan);
      color: var(--color-black);
    }

    .btn-purple {
      background-color: var(--color-purple);
      color: #FFFFFF;
    }

    .mobile-menu-toggle {
      display: none;
      background: var(--color-yellow);
      border: var(--border-thick);
      box-shadow: 2px 2px 0 var(--color-black);
      border-radius: var(--radius-sm);
      padding: 8px 12px;
      font-weight: 900;
      cursor: pointer;
    }

    /* 模块通用样式 */
    section {
      padding: 60px 0;
      position: relative;
    }

    .section-title-wrap {
      text-align: center;
      margin-bottom: 40px;
    }

    .section-badge {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 800;
      padding: 4px 14px;
      background: #FFFFFF;
      border: var(--border-thick);
      border-radius: var(--radius-pill);
      box-shadow: var(--shadow-doodle);
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 900;
      color: var(--color-black);
      letter-spacing: -0.5px;
      margin-bottom: 12px;
    }

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

    /* Hero 首屏 (绝对不出现任何图片) */
    .hero-section {
      padding: 60px 0 50px 0;
    }

    .hero-inner {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .hero-tag {
      background: var(--color-cyan);
      color: var(--color-black);
      font-weight: 800;
      font-size: 0.95rem;
      padding: 6px 18px;
      border: var(--border-thick);
      border-radius: var(--radius-pill);
      box-shadow: var(--shadow-doodle);
      margin-bottom: 24px;
      transform: rotate(-1.5deg);
    }

    .hero-h1 {
      font-size: clamp(2rem, 4.5vw, 3.2rem);
      font-weight: 900;
      color: var(--color-black);
      line-height: 1.25;
      margin-bottom: 20px;
      max-width: 900px;
    }

    .hero-h1 .highlight-sketch {
      background: linear-gradient(180deg, transparent 65%, var(--color-yellow) 65%);
      padding: 0 4px;
      display: inline;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 740px;
      margin-bottom: 32px;
      font-weight: 500;
    }

    .hero-action-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: center;
      margin-bottom: 40px;
    }

    .hero-action-group .btn {
      padding: 14px 32px;
      font-size: 1.1rem;
    }

    .hero-data-board {
      width: 100%;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 10px;
    }

    .data-pill-card {
      background: var(--bg-card);
      border: var(--border-thick);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-doodle);
      padding: 20px 14px;
      text-align: center;
      transition: transform 0.2s ease;
    }

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

    .data-num {
      font-size: 2rem;
      font-weight: 900;
      color: var(--color-black);
      display: block;
      line-height: 1.1;
    }

    .data-label {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-muted);
      margin-top: 6px;
    }

    /* 平台支持大模型跑马灯/标签云 */
    .model-strip {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      padding: 24px;
      background: #FFFFFF;
      border: var(--border-thick);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-doodle-lg);
    }

    .model-tag {
      font-size: 0.88rem;
      font-weight: 800;
      padding: 6px 14px;
      border: 2px solid var(--color-black);
      border-radius: var(--radius-pill);
      background: var(--bg-page);
      box-shadow: 2px 2px 0 var(--color-black);
      transition: all 0.15s ease;
    }

    .model-tag:nth-child(3n+1) { background-color: #FFF3B0; }
    .model-tag:nth-child(3n+2) { background-color: #D1F4FF; }
    .model-tag:nth-child(3n+3) { background-color: #FFE0E9; }

    .model-tag:hover {
      transform: scale(1.06) rotate(1deg);
    }

    /* 卡片通用 */
    .doodle-card {
      background: var(--bg-card);
      border: var(--border-thick);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-doodle-lg);
      padding: 26px;
      display: flex;
      flex-direction: column;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .doodle-card:hover {
      transform: translateY(-4px);
      box-shadow: 8px 8px 0 var(--color-black);
    }

    /* 服务板块网格 */
    .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: 24px;
    }

    .card-icon-badge {
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.25rem;
      border: var(--border-thick);
      border-radius: var(--radius-md);
      box-shadow: 2px 2px 0 var(--color-black);
      margin-bottom: 16px;
      background: var(--color-yellow);
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 8px;
      color: var(--color-black);
    }

    .card-desc {
      font-size: 0.94rem;
      color: var(--text-muted);
      flex-grow: 1;
      margin-bottom: 16px;
    }

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

    .mini-badge {
      font-size: 0.76rem;
      font-weight: 700;
      padding: 3px 8px;
      background: #F3F4F6;
      border: 1.5px solid var(--color-black);
      border-radius: var(--radius-sm);
    }

    /* 图文素材展示区 */
    .img-showcase-box {
      border: var(--border-thick);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-doodle);
      background: #000;
      margin-bottom: 16px;
    }

    .img-showcase-box img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: contain;
      max-height: 260px;
      background-color: #F7F7F7;
    }

    /* 流程时间线 */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }

    .process-step {
      background: #FFFFFF;
      border: var(--border-thick);
      border-radius: var(--radius-md);
      padding: 20px 16px;
      box-shadow: var(--shadow-doodle);
      text-align: center;
    }

    .step-num {
      display: inline-block;
      width: 38px;
      height: 38px;
      line-height: 34px;
      font-weight: 900;
      background: var(--color-cyan);
      border: 2px solid var(--color-black);
      border-radius: 50%;
      margin-bottom: 12px;
      box-shadow: 2px 2px 0 var(--color-black);
    }

    .step-title {
      font-weight: 800;
      font-size: 1.05rem;
      margin-bottom: 6px;
    }

    .step-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 对比评测表格 */
    .comparison-container {
      background: #FFFFFF;
      border: var(--border-thick);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-doodle-lg);
      padding: 28px;
      overflow-x: auto;
    }

    .review-score-hero {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: #FFF9E6;
      border: var(--border-thick);
      border-radius: var(--radius-md);
      padding: 18px 24px;
      margin-bottom: 24px;
    }

    .score-badge-large {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .score-stars {
      color: #F59E0B;
      font-size: 1.6rem;
      letter-spacing: 2px;
    }

    .score-number {
      font-size: 2.2rem;
      font-weight: 900;
      background: var(--color-yellow);
      padding: 2px 14px;
      border: var(--border-thick);
      border-radius: var(--radius-sm);
      box-shadow: 2px 2px 0 var(--color-black);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 640px;
    }

    .comparison-table th,
    .comparison-table td {
      padding: 14px 18px;
      border: 1.5px solid var(--color-black);
      font-size: 0.95rem;
    }

    .comparison-table th {
      background: #F4F5F7;
      font-weight: 800;
    }

    .comparison-table tr:nth-child(even) td {
      background: #FAFAFB;
    }

    .comparison-table .highlight-col {
      background: #FFFDEB !important;
      font-weight: 700;
    }

    /* FAQ 手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .faq-item {
      background: #FFFFFF;
      border: var(--border-thick);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-doodle);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 16px 20px;
      font-weight: 800;
      font-size: 1rem;
      background: none;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-question::after {
      content: "+";
      font-size: 1.4rem;
      font-weight: 900;
      transition: transform 0.2s ease;
    }

    .faq-item.active .faq-question::after {
      content: "-";
      transform: rotate(180deg);
    }

    .faq-answer {
      display: none;
      padding: 0 20px 18px 20px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px dashed #DDD;
      padding-top: 12px;
    }

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

    /* 用户评论卡片 */
    .testimonial-card {
      background: #FFFFFF;
      border: var(--border-thick);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-doodle);
      padding: 22px;
      display: flex;
      flex-direction: column;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }

    .user-avatar-tag {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      border: 2px solid var(--color-black);
      background: var(--color-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      box-shadow: 2px 2px 0 var(--color-black);
    }

    .user-meta-name {
      font-weight: 800;
      font-size: 1rem;
      color: var(--color-black);
    }

    .user-meta-role {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .testimonial-quote {
      font-size: 0.92rem;
      color: var(--text-main);
      flex-grow: 1;
      font-style: normal;
    }

    /* 表单区域 */
    .form-wrapper {
      background: #FFFFFF;
      border: var(--border-thick);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-doodle-lg);
      padding: 36px;
      max-width: 760px;
      margin: 0 auto;
    }

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

    .form-label {
      display: block;
      font-weight: 800;
      font-size: 0.94rem;
      margin-bottom: 6px;
      color: var(--color-black);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: var(--border-thick);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
      background: #FAFAFA;
      transition: border-color 0.2s;
    }

    .form-control:focus {
      background: #FFFFFF;
      border-color: var(--color-purple);
    }

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

    /* 资讯板块 */
    .article-link-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item {
      background: #FFFFFF;
      border: var(--border-thick);
      border-radius: var(--radius-md);
      padding: 14px 20px;
      box-shadow: var(--shadow-doodle);
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.2s ease;
    }

    .article-item:hover {
      background: #FFFEEA;
      transform: translateX(4px);
    }

    .article-title {
      font-weight: 700;
      font-size: 0.98rem;
    }

    .article-arrow {
      font-weight: 900;
      color: var(--color-black);
    }

    /* 友情链接与客服信息 */
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding: 18px;
      background: #FFFFFF;
      border: var(--border-thick);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-doodle);
      margin-top: 20px;
    }

    .friend-links-box a {
      font-weight: 700;
      font-size: 0.88rem;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      border: 1px dashed var(--color-black);
      background: #F9FAFB;
      transition: all 0.15s ease;
    }

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

    .contact-info-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .contact-card {
      background: #FFFFFF;
      border: var(--border-thick);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-doodle);
      padding: 20px;
      text-align: center;
    }

    .contact-qr-img {
      max-width: 130px;
      height: auto;
      margin: 12px auto;
      display: block;
      border: 2px solid var(--color-black);
      border-radius: var(--radius-sm);
    }

    /* 页脚 */
    .site-footer {
      background: #FFFFFF;
      border-top: var(--border-thick);
      padding: 40px 0 30px 0;
      margin-top: 40px;
    }

    .footer-content {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
      text-align: center;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .footer-brand-title {
      font-weight: 900;
      font-size: 1.2rem;
      color: var(--color-black);
    }

    /* 浮动组件 */
    .floating-kefu-btn {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 1000;
      background: var(--color-yellow);
      border: var(--border-thick);
      border-radius: var(--radius-pill);
      box-shadow: var(--shadow-doodle);
      padding: 10px 18px;
      font-weight: 900;
      display: flex;
      align-items: center;
      gap: 8px;
      cursor: pointer;
      transition: transform 0.2s ease;
    }

    .floating-kefu-btn:hover {
      transform: translateY(-3px);
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .grid-3, .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: 1fr;
      }
      .hero-data-board {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-info-grid {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        border-bottom: var(--border-thick);
        flex-direction: column;
        padding: 16px 0;
        box-shadow: 0 10px 0 rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 600px) {
      .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .hero-data-board {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 1.65rem;
      }
      .score-badge-large {
        flex-direction: column;
        align-items: flex-start;
      }
      .review-score-hero {
        flex-direction: column;
        gap: 12px;
      }
    }