:root {
      --primary: #ff4757;
      --primary-hover: #ff6b81;
      --secondary: #2ed573;
      --accent-yellow: #ffa502;
      --accent-blue: #1e90ff;
      --accent-purple: #9b59b6;
      --dark: #2f3542;
      --text: #333333;
      --text-muted: #57606f;
      --bg-base: #fefcf8;
      --bg-alt: #fdf6ec;
      --card-bg: #ffffff;
      --border-ink: #2f3542;
      --shadow-ink: 4px 4px 0px #2f3542;
      --shadow-ink-lg: 7px 7px 0px #2f3542;
      --radius: 14px;
      --max-w: 1200px;
      --transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      background-image: 
        radial-gradient(circle at 10% 20%, rgba(255, 165, 2, 0.08) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(30, 144, 255, 0.08) 0%, transparent 25%),
        radial-gradient(circle at 50% 50%, rgba(255, 71, 87, 0.05) 0%, transparent 30%);
      color: var(--text);
      line-height: 1.65;
      overflow-x: hidden;
      position: relative;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

    .container {
      width: 100%;
      max-width: var(--max-w);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 涂鸦线框标签与徽章 */
    .graffiti-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      padding: 4px 12px;
      border: 2px solid var(--border-ink);
      border-radius: 20px;
      background: #ffffff;
      box-shadow: 2px 2px 0px var(--border-ink);
      transform: rotate(-1.5deg);
      margin-bottom: 12px;
    }
    .graffiti-tag.yellow { background: var(--accent-yellow); color: #fff; }
    .graffiti-tag.blue { background: var(--accent-blue); color: #fff; }
    .graffiti-tag.green { background: var(--secondary); color: #fff; }
    .graffiti-tag.red { background: var(--primary); color: #fff; }

    /* 按钮样式 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
      padding: 12px 26px;
      border-radius: var(--radius);
      border: 2px solid var(--border-ink);
      background: #ffffff;
      color: var(--dark);
      box-shadow: var(--shadow-ink);
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
      line-height: 1.2;
    }
    .btn:hover {
      transform: translate(-2px, -2px);
      box-shadow: 6px 6px 0px var(--border-ink);
    }
    .btn:active {
      transform: translate(2px, 2px);
      box-shadow: 1px 1px 0px var(--border-ink);
    }
    .btn-primary {
      background: var(--primary);
      color: #ffffff;
    }
    .btn-secondary {
      background: var(--accent-yellow);
      color: var(--dark);
    }
    .btn-accent {
      background: var(--accent-blue);
      color: #ffffff;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(254, 252, 248, 0.95);
      border-bottom: 2px solid var(--border-ink);
      backdrop-filter: blur(10px);
    }
    .navbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .logo-box {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }
    .brand-title {
      font-size: 1.35rem;
      font-weight: 900;
      color: var(--dark);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      gap: 0;
      list-style: none;
      align-items: center;
    }
    .nav-links li a {
      font-weight: 700;
      color: var(--dark);
      padding: 8px 14px;
      border-radius: 8px;
      transition: var(--transition);
    }
    .nav-links li a:hover {
      background: var(--accent-yellow);
      color: var(--dark);
      transform: rotate(-1deg);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: 2px solid var(--border-ink);
      border-radius: 8px;
      padding: 8px 10px;
      font-size: 1.2rem;
      cursor: pointer;
      box-shadow: 2px 2px 0px var(--border-ink);
    }

    /* 主体通用区域排版 */
    section {
      padding: 70px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 900;
      color: var(--dark);
      margin-bottom: 15px;
      line-height: 1.3;
    }
    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 首屏 Hero 区：按要求无任何图片，纯CSS与结构 */
    .hero-section {
      padding: 80px 0 60px 0;
      background: linear-gradient(135deg, #fff9e6 0%, #fff1f2 50%, #e8f4f8 100%);
      border-bottom: 2px solid var(--border-ink);
      position: relative;
      overflow: hidden;
    }
    .hero-wrapper {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 2px solid var(--border-ink);
      border-radius: 30px;
      font-weight: 800;
      font-size: 0.95rem;
      box-shadow: var(--shadow-ink);
      margin-bottom: 24px;
      transform: rotate(-1deg);
    }
    .hero-title {
      font-size: 2.8rem;
      font-weight: 950;
      color: var(--dark);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-title span {
      background: linear-gradient(120deg, var(--primary), var(--accent-yellow));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
      text-shadow: none;
      position: relative;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 760px;
      margin-bottom: 35px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
      margin-bottom: 40px;
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      width: 100%;
      margin-top: 20px;
    }
    .stat-card {
      background: #ffffff;
      border: 2px solid var(--border-ink);
      border-radius: var(--radius);
      padding: 18px 12px;
      box-shadow: var(--shadow-ink);
      text-align: center;
      transition: var(--transition);
    }
    .stat-card:hover {
      transform: translateY(-3px);
      box-shadow: 6px 6px 0px var(--border-ink);
    }
    .stat-value {
      font-size: 1.7rem;
      font-weight: 900;
      color: var(--primary);
    }
    .stat-label {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 多彩涂鸦风卡片矩阵 */
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }
    .card-grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }
    .graffiti-card {
      background: var(--card-bg);
      border: 2px solid var(--border-ink);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-ink);
      transition: var(--transition);
      position: relative;
      display: flex;
      flex-direction: column;
    }
    .graffiti-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-ink-lg);
    }
    .graffiti-card h3 {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--dark);
      margin: 12px 0 8px 0;
    }
    .graffiti-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      flex-grow: 1;
    }
    .card-badge {
      position: absolute;
      top: 16px;
      right: 16px;
      font-size: 0.75rem;
      font-weight: 800;
      padding: 2px 8px;
      border: 1.5px solid var(--border-ink);
      border-radius: 12px;
      background: var(--accent-yellow);
    }

    /* 支持大模型标签池 */
    .model-pills-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }
    .model-pill {
      font-size: 0.9rem;
      font-weight: 700;
      padding: 6px 14px;
      background: #ffffff;
      border: 2px solid var(--border-ink);
      border-radius: 12px;
      box-shadow: 2px 2px 0px var(--border-ink);
      transition: var(--transition);
    }
    .model-pill:hover {
      background: var(--accent-yellow);
      transform: scale(1.05) rotate(1deg);
    }

    /* 素材图片区域 */
    .media-showcase-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      align-items: stretch;
      margin-top: 30px;
    }
    .media-card {
      background: #ffffff;
      border: 2px solid var(--border-ink);
      border-radius: var(--radius);
      padding: 16px;
      box-shadow: var(--shadow-ink);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .media-box {
      border: 2px solid var(--border-ink);
      border-radius: 10px;
      overflow: hidden;
      margin-bottom: 12px;
      background: #f1f2f6;
    }
    .media-box img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }
    .media-card h4 {
      font-size: 1.15rem;
      font-weight: 800;
      margin-bottom: 6px;
    }
    .media-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 对比评测表 */
    .table-container {
      width: 100%;
      overflow-x: auto;
      border: 2px solid var(--border-ink);
      border-radius: var(--radius);
      box-shadow: var(--shadow-ink-lg);
      background: #ffffff;
      margin-top: 20px;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 2px solid #edf2f7;
      font-size: 0.95rem;
    }
    .compare-table th {
      background: #fff9e6;
      font-weight: 900;
      color: var(--dark);
      border-bottom: 2px solid var(--border-ink);
    }
    .compare-table tr:hover td {
      background: #fdfaf2;
    }
    .rating-highlight {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 1.1rem;
      font-weight: 900;
      color: var(--primary);
    }

    /* 标准制作流程 */
    .step-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      position: relative;
      margin-top: 30px;
    }
    .step-card {
      background: #ffffff;
      border: 2px solid var(--border-ink);
      border-radius: var(--radius);
      padding: 20px;
      box-shadow: var(--shadow-ink);
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--accent-yellow);
      border: 2px solid var(--border-ink);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      margin-bottom: 12px;
      box-shadow: 2px 2px 0px var(--border-ink);
    }
    .step-card h4 {
      font-size: 1.1rem;
      font-weight: 800;
      margin-bottom: 6px;
    }
    .step-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* FAQ 手风琴折叠 */
    .faq-container {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border: 2px solid var(--border-ink);
      border-radius: var(--radius);
      box-shadow: var(--shadow-ink);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      padding: 18px 22px;
      font-size: 1.05rem;
      font-weight: 800;
      color: var(--dark);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }
    .faq-question:hover {
      background: #fffdf5;
    }
    .faq-icon {
      font-weight: 900;
      transition: transform 0.25s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #fafafa;
      border-top: 1px dashed transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      border-top-color: var(--border-ink);
      padding: 16px 22px;
    }
    .faq-answer p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 用户评论卡片 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }
    .review-card {
      background: #ffffff;
      border: 2px solid var(--border-ink);
      border-radius: var(--radius);
      padding: 22px;
      box-shadow: var(--shadow-ink);
      display: flex;
      flex-direction: column;
    }
    .review-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .review-avatar {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      border: 2px solid var(--border-ink);
      background: var(--accent-yellow);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      color: var(--dark);
    }
    .reviewer-meta h4 {
      font-size: 1rem;
      font-weight: 800;
    }
    .reviewer-meta span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    .review-text {
      font-size: 0.92rem;
      color: var(--text);
      line-height: 1.6;
      flex-grow: 1;
    }
    .review-stars {
      color: #ff9f43;
      margin-top: 12px;
      font-size: 0.9rem;
    }

    /* 需求表单区 */
    .form-wrapper {
      max-width: 760px;
      margin: 0 auto;
      background: #ffffff;
      border: 2px solid var(--border-ink);
      border-radius: var(--radius);
      padding: 36px 30px;
      box-shadow: var(--shadow-ink-lg);
    }
    .contact-form {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
    }
    .form-full {
      grid-column: span 2;
    }
    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 2px solid var(--border-ink);
      border-radius: 8px;
      font-size: 0.95rem;
      background: #fdfdfd;
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 2px 2px 0px var(--border-ink);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* 最新文章与资讯 */
    .articles-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 16px;
      margin-top: 24px;
    }
    .article-item {
      background: #ffffff;
      border: 2px solid var(--border-ink);
      border-radius: 10px;
      padding: 16px;
      box-shadow: var(--shadow-ink);
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition);
    }
    .article-item:hover {
      background: #fff8e7;
      transform: translateX(4px);
    }
    .article-item a {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--dark);
      word-break: break-all;
    }

    /* 底部专属布局与友链 */
    .site-footer {
      background: #ffffff;
      border-top: 2px solid var(--border-ink);
      padding: 60px 0 30px 0;
      position: relative;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.2fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      font-size: 1.1rem;
      font-weight: 900;
      margin-bottom: 16px;
      color: var(--dark);
    }
    .footer-col p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 12px;
    }
    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-links-list a {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-muted);
    }
    .footer-links-list a:hover {
      color: var(--primary);
    }
    .qr-card {
      display: inline-block;
      border: 2px solid var(--border-ink);
      border-radius: 8px;
      padding: 8px;
      background: #ffffff;
      box-shadow: var(--shadow-ink);
    }
    .qr-card img {
      width: 100px;
      height: 100px;
      display: block;
      object-fit: cover;
    }
    .friend-links-box {
      border: 2px dashed var(--border-ink);
      border-radius: var(--radius);
      padding: 16px 20px;
      background: #fafafa;
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
      margin-bottom: 30px;
    }
    .friend-links-box span {
      font-weight: 800;
      font-size: 0.9rem;
      color: var(--dark);
    }
    .friend-links-box a {
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--accent-blue);
      padding: 4px 10px;
      background: #ffffff;
      border: 1px solid var(--border-ink);
      border-radius: 6px;
    }
    .friend-links-box a:hover {
      background: var(--accent-yellow);
      color: var(--dark);
    }
    .copyright-bar {
      border-top: 1px solid #e2e8f0;
      padding-top: 24px;
      text-align: center;
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 悬浮客服挂件与返回顶部 */
    .float-dock {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .dock-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 2px solid var(--border-ink);
      box-shadow: var(--shadow-ink);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-weight: 900;
      font-size: 1.1rem;
      transition: var(--transition);
      position: relative;
    }
    .dock-btn:hover {
      transform: scale(1.1);
      background: var(--accent-yellow);
    }
    .dock-qr-popup {
      position: absolute;
      right: 60px;
      bottom: 0;
      display: none;
      background: #ffffff;
      border: 2px solid var(--border-ink);
      border-radius: var(--radius);
      padding: 12px;
      box-shadow: var(--shadow-ink-lg);
      width: 140px;
      text-align: center;
    }
    .dock-btn:hover .dock-qr-popup {
      display: block;
    }
    .dock-qr-popup img {
      width: 100%;
      height: auto;
      display: block;
      margin-bottom: 6px;
    }
    .dock-qr-popup span {
      font-size: 0.75rem;
      font-weight: 700;
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .hero-title { font-size: 2.2rem; }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .media-showcase-grid { grid-template-columns: 1fr; }
      .step-timeline { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .mobile-menu-btn { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 2px solid var(--border-ink);
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 15px rgba(0,0,0,0.1);
      }
      .nav-links.active { display: flex; }
      .hero-title { font-size: 1.8rem; }
      .contact-form { grid-template-columns: 1fr; }
      .form-full { grid-column: span 1; }
      .step-timeline { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }