:root {
      --bg-main: #faf8f5;
      --bg-card: #ffffff;
      --text-main: #18181b;
      --text-muted: #52525b;
      --text-sub: #71717a;
      --border-color: #18181b;
      --brand-yellow: #fde047;
      --brand-coral: #fb7185;
      --brand-cyan: #38bdf8;
      --brand-mint: #4ade80;
      --brand-purple: #c084fc;
      --shadow-pop: 4px 4px 0px #18181b;
      --shadow-hover: 6px 6px 0px #18181b;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      background-image: radial-gradient(#e4e4e7 1px, transparent 1px);
      background-size: 24px 24px;
      overflow-x: hidden;
    }

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

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(250, 248, 245, 0.95);
      border-bottom: 2px solid var(--border-color);
      backdrop-filter: blur(8px);
    }

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

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

    .brand-wrap .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

    .brand-text {
      font-size: 1.3rem;
      font-weight: 900;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .badge-pop {
      background: var(--brand-yellow);
      border: 2px solid var(--border-color);
      box-shadow: 2px 2px 0px var(--border-color);
      font-size: 0.72rem;
      padding: 1px 7px;
      border-radius: var(--radius-sm);
      font-weight: 800;
      transform: rotate(-3deg);
    }

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

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
      display: block;
    }

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

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

    .btn-pop {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.95rem;
      padding: 10px 22px;
      border-radius: var(--radius-md);
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow-pop);
      cursor: pointer;
      transition: all 0.18s ease;
      background: #ffffff;
      color: var(--text-main);
    }

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

    .btn-pop:active {
      transform: translate(2px, 2px);
      box-shadow: 0px 0px 0px var(--border-color);
    }

    .btn-yellow { background: var(--brand-yellow); }
    .btn-coral { background: var(--brand-coral); color: #fff; }
    .btn-cyan { background: var(--brand-cyan); }
    .btn-mint { background: var(--brand-mint); }

    .mobile-menu-toggle {
      display: none;
      background: #fff;
      border: 2px solid var(--border-color);
      box-shadow: 2px 2px 0px var(--border-color);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      font-size: 1.1rem;
      cursor: pointer;
      font-weight: 900;
    }

    /* 首屏 Hero 无图片纯技术排版 */
    .hero-section {
      padding: 64px 0 54px;
      position: relative;
    }

    .hero-wrap {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content {
      position: relative;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow-pop);
      padding: 6px 14px;
      border-radius: var(--radius-md);
      font-weight: 800;
      font-size: 0.88rem;
      margin-bottom: 20px;
      transform: rotate(-1.5deg);
    }

    .hero-tag span {
      background: var(--brand-coral);
      color: #fff;
      padding: 2px 6px;
      border-radius: 4px;
      font-size: 0.75rem;
    }

    .hero-title {
      font-size: clamp(2rem, 3.8vw, 2.9rem);
      line-height: 1.25;
      font-weight: 900;
      letter-spacing: -1px;
      margin-bottom: 18px;
      color: var(--text-main);
    }

    .hero-title .highlight-scribble {
      position: relative;
      display: inline-block;
      z-index: 1;
    }

    .hero-title .highlight-scribble::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 6px;
      width: 100%;
      height: 14px;
      background: var(--brand-yellow);
      z-index: -1;
      transform: rotate(-1.2deg);
      border-radius: 4px;
    }

    .hero-desc {
      font-size: 1.12rem;
      color: var(--text-muted);
      margin-bottom: 28px;
      line-height: 1.7;
      max-width: 620px;
    }

    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      margin-bottom: 30px;
    }

    .hero-cta-group .btn-pop {
      font-size: 1.05rem;
      padding: 13px 28px;
    }

    .hero-perks {
      display: flex;
      flex-wrap: wrap;
      gap: 18px;
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-muted);
    }

    .hero-perk-item {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .hero-perk-icon {
      width: 18px;
      height: 18px;
      background: var(--brand-mint);
      border: 1.5px solid var(--border-color);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.65rem;
      font-weight: 900;
    }

    /* 首屏右侧纯CSS多模型涂鸦画板面板 */
    .hero-dashboard {
      background: #ffffff;
      border: 2.5px solid var(--border-color);
      box-shadow: 8px 8px 0px var(--border-color);
      border-radius: var(--radius-lg);
      padding: 26px;
      position: relative;
    }

    .panel-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 2px dashed #e4e4e7;
      padding-bottom: 16px;
      margin-bottom: 20px;
    }

    .panel-dots {
      display: flex;
      gap: 7px;
    }

    .p-dot {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      border: 1.5px solid var(--border-color);
    }
    .p-red { background: #f87171; }
    .p-yel { background: #fde047; }
    .p-grn { background: #4ade80; }

    .panel-status {
      font-size: 0.8rem;
      font-weight: 800;
      background: #f4f4f5;
      padding: 4px 10px;
      border-radius: 20px;
      border: 1.5px solid var(--border-color);
    }

    .live-stream-box {
      background: #fdfdfd;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 16px;
      margin-bottom: 16px;
    }

    .stream-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 10px;
      font-size: 0.85rem;
      font-weight: 800;
    }

    .stream-badge {
      background: var(--brand-purple);
      color: #fff;
      padding: 2px 8px;
      border-radius: 4px;
      border: 1px solid var(--border-color);
      font-size: 0.72rem;
    }

    .stream-code-line {
      font-family: monospace;
      font-size: 0.82rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    .model-pills-row {
      display: flex;
      flex-wrap: wrap;
      gap: 7px;
      margin-top: 14px;
    }

    .model-pill {
      font-size: 0.78rem;
      font-weight: 800;
      background: #f4f4f5;
      border: 1.5px solid var(--border-color);
      padding: 3px 8px;
      border-radius: var(--radius-sm);
      box-shadow: 2px 2px 0 var(--border-color);
    }

    /* 通用区块排版 */
    section {
      padding: 70px 0;
      position: relative;
    }

    .section-title-wrap {
      text-align: center;
      margin-bottom: 46px;
    }

    .section-sticker {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 800;
      padding: 5px 14px;
      border-radius: var(--radius-md);
      border: 2px solid var(--border-color);
      box-shadow: 3px 3px 0 var(--border-color);
      background: var(--brand-cyan);
      margin-bottom: 12px;
      transform: rotate(-1.5deg);
    }

    .section-heading {
      font-size: clamp(1.6rem, 2.8vw, 2.2rem);
      font-weight: 900;
      letter-spacing: -0.5px;
      margin-bottom: 10px;
    }

    .section-sub {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 620px;
      margin: 0 auto;
    }

    /* 涂鸦卡片组件 */
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

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

    .doodle-card {
      background: #ffffff;
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow-pop);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: all 0.2s ease;
      display: flex;
      flex-direction: column;
    }

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

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

    .card-title {
      font-size: 1.15rem;
      font-weight: 900;
      margin-bottom: 8px;
    }

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

    /* 支持模型滚动/瀑布云 */
    .cloud-models {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag-badge {
      background: #fff;
      border: 2px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 800;
      box-shadow: 3px 3px 0 var(--border-color);
      transition: all 0.2s ease;
    }

    .model-tag-badge:hover {
      background: var(--brand-yellow);
      transform: rotate(-2deg) scale(1.05);
    }

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

    .step-card {
      background: #ffffff;
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow-pop);
      border-radius: var(--radius-md);
      padding: 22px;
      position: relative;
    }

    .step-num {
      width: 34px;
      height: 34px;
      border-radius: 50%;
      background: var(--brand-coral);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      border: 2px solid var(--border-color);
      box-shadow: 2px 2px 0 var(--border-color);
      margin-bottom: 14px;
    }

    /* 对比评测表格板块 */
    .review-score-banner {
      background: #fff;
      border: 2.5px solid var(--border-color);
      box-shadow: 8px 8px 0 var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .score-left h3 {
      font-size: 1.45rem;
      font-weight: 900;
      margin-bottom: 6px;
    }

    .score-stars {
      color: #eab308;
      font-size: 1.25rem;
      margin-bottom: 4px;
    }

    .score-highlight {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1;
      color: var(--text-main);
      background: var(--brand-yellow);
      padding: 8px 18px;
      border-radius: var(--radius-md);
      border: 2px solid var(--border-color);
      box-shadow: 4px 4px 0 var(--border-color);
    }

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

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.94rem;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1.5px solid #e4e4e7;
    }

    .compare-table th {
      background: #f4f4f5;
      font-weight: 800;
      color: var(--text-main);
    }

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

    .tag-strong {
      color: #15803d;
      font-weight: 800;
    }

    /* 案例图片展示区 (首屏以外) */
    .case-media-box {
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      margin-bottom: 14px;
      background: #e4e4e7;
      aspect-ratio: 16 / 9;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .case-media-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

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

    /* 宣传图通栏 */
    .banner-strip {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 24px;
    }

    .banner-img-wrap {
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-pop);
      overflow: hidden;
      background: #ffffff;
    }

    .banner-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* 常见问题折叠面板 */
    .faq-accordion {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-pop);
      overflow: hidden;
      transition: all 0.2s ease;
    }

    .faq-trigger {
      width: 100%;
      padding: 18px 22px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 1.05rem;
      font-weight: 800;
      background: none;
      border: none;
      cursor: pointer;
      text-align: left;
      color: var(--text-main);
    }

    .faq-icon-cross {
      font-size: 1.25rem;
      font-weight: 900;
      transition: transform 0.2s ease;
    }

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

    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #fafafa;
      border-top: 0px solid var(--border-color);
    }

    .faq-item.active .faq-body {
      max-height: 200px;
      border-top: 1.5px dashed #d4d4d8;
    }

    .faq-body p {
      padding: 16px 22px;
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 需求匹配表单 */
    .form-wrapper {
      background: #ffffff;
      border: 2.5px solid var(--border-color);
      box-shadow: 8px 8px 0px var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      max-width: 820px;
      margin: 0 auto;
    }

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

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .form-group.full-width {
      grid-column: 1 / -1;
    }

    .form-group label {
      font-weight: 800;
      font-size: 0.92rem;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.94rem;
      font-family: inherit;
      background: #fafafa;
    }

    .form-control:focus {
      outline: none;
      background: #ffffff;
      box-shadow: 3px 3px 0 var(--border-color);
    }

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

    /* 文章列表 */
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
      gap: 16px;
      margin-top: 20px;
    }

    .article-item {
      background: #ffffff;
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow-pop);
      padding: 16px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 0.9rem;
      display: block;
      transition: all 0.2s ease;
    }

    .article-item:hover {
      background: var(--brand-yellow);
      transform: translate(-2px, -2px);
      box-shadow: var(--shadow-hover);
    }

    /* 页脚与联络体系 */
    .site-footer {
      background: #ffffff;
      border-top: 2.5px solid var(--border-color);
      padding: 60px 0 30px;
      color: var(--text-main);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin: 14px 0 20px;
      max-width: 320px;
    }

    .footer-col h4 {
      font-size: 1.05rem;
      font-weight: 900;
      margin-bottom: 16px;
    }

    .footer-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .footer-list li a:hover {
      color: var(--text-main);
      text-decoration: underline;
    }

    .qr-wrap {
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow-pop);
      border-radius: var(--radius-sm);
      display: inline-block;
      padding: 8px;
      background: #ffffff;
      max-width: 130px;
    }

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

    .friend-links-box {
      border-top: 1.5px dashed #e4e4e7;
      padding-top: 24px;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 0.88rem;
    }

    .friend-links-box a {
      color: var(--text-muted);
      font-weight: 700;
      background: #f4f4f5;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      border: 1px solid #d4d4d8;
    }

    .friend-links-box a:hover {
      background: var(--brand-yellow);
      color: var(--text-main);
      border-color: var(--border-color);
    }

    .footer-bottom {
      border-top: 1.5px solid #e4e4e7;
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-sub);
    }

    /* 浮动客服 */
    .float-dock {
      position: fixed;
      right: 20px;
      bottom: 26px;
      z-index: 990;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .dock-btn {
      width: 48px;
      height: 48px;
      background: var(--brand-yellow);
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow-pop);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 0.82rem;
      cursor: pointer;
      transition: all 0.2s;
    }

    .dock-btn:hover {
      transform: scale(1.08);
      box-shadow: var(--shadow-hover);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-wrap {
        grid-template-columns: 1fr;
      }
      .card-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-wrapper {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 2px solid var(--border-color);
        flex-direction: column;
        padding: 16px;
        box-shadow: var(--shadow-pop);
      }
      .nav-links.active {
        display: flex;
      }
      .card-grid-3, .card-grid-2, .banner-strip, .form-grid {
        grid-template-columns: 1fr;
      }
      .steps-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-section {
        padding: 36px 0;
      }
      .review-score-banner {
        flex-direction: column;
        text-align: center;
      }
    }