:root {
      --bg-main: #faf9f6;
      --bg-card: #ffffff;
      --bg-alt: #f3f0ea;
      --text-main: #191b22;
      --text-muted: #575e6d;
      --text-light: #7c8596;
      --primary: #ff3366;
      --primary-hover: #e02456;
      --secondary: #00d2ff;
      --accent-yellow: #ffe600;
      --accent-purple: #7928ca;
      --accent-green: #05c46b;
      --border-color: #232733;
      --border-soft: #e5e0d8;
      --shadow-graffiti: 4px 4px 0px #191b22;
      --shadow-hover: 6px 6px 0px #ff3366;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-width: 1200px;
      --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-main);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      background-image: radial-gradient(#e2ded4 1.5px, transparent 1.5px);
      background-size: 24px 24px;
    }

    a {
      color: var(--text-main);
      text-decoration: none;
      transition: color 0.2s ease, transform 0.2s ease;
    }

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

    .container {
      width: 100%;
      max-width: var(--container-width);
      margin-left: auto;
      margin-right: 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-color);
    }

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

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

    .brand-box .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .brand-tag {
      font-size: 0.72rem;
      font-weight: 700;
      background: var(--accent-yellow);
      color: var(--border-color);
      padding: 2px 6px;
      border-radius: 4px;
      border: 1.5px solid var(--border-color);
      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: 600;
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      color: var(--text-main);
    }

    .nav-links li a:hover {
      background: var(--accent-yellow);
      color: var(--text-main);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 700;
      border-radius: var(--radius-sm);
      border: 2px solid var(--border-color);
      cursor: pointer;
      box-shadow: var(--shadow-graffiti);
      transition: all 0.15s ease;
      text-align: center;
    }

    .btn:hover {
      transform: translate(-2px, -2px);
      box-shadow: 6px 6px 0px var(--border-color);
    }

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

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

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

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

    .btn-cyan {
      background: var(--secondary);
      color: var(--text-main);
    }

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

    /* 首屏 Hero (无任何图片) */
    .hero-section {
      padding: 70px 0 60px;
      position: relative;
    }

    .hero-wrapper {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      position: relative;
    }

    .hero-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: var(--bg-card);
      border: 2px solid var(--border-color);
      border-radius: 30px;
      box-shadow: 3px 3px 0px var(--accent-purple);
      margin-bottom: 24px;
      font-weight: 700;
      font-size: 0.9rem;
    }

    .hero-pill-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: var(--accent-green);
      display: inline-block;
      box-shadow: 0 0 0 3px rgba(5, 196, 107, 0.2);
    }

    .hero-title {
      font-size: clamp(2rem, 5vw, 3.2rem);
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      max-width: 900px;
      letter-spacing: -1px;
    }

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

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 780px;
      margin-bottom: 36px;
      font-weight: 500;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: center;
      margin-bottom: 48px;
    }

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

    .model-ticker-box {
      width: 100%;
      background: var(--bg-card);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-graffiti);
      padding: 16px 20px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .ticker-label {
      font-size: 0.85rem;
      font-weight: 800;
      color: var(--text-muted);
      text-transform: uppercase;
      letter-spacing: 1px;
      text-align: left;
    }

    .model-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      justify-content: center;
    }

    .model-tag {
      font-size: 0.85rem;
      font-weight: 700;
      padding: 4px 10px;
      background: var(--bg-alt);
      border: 1.5px solid var(--border-color);
      border-radius: 6px;
      color: var(--text-main);
      transition: all 0.15s ease;
    }

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

    /* 区域统一标准 */
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }

    .section-wrap.alt-bg {
      background-color: var(--bg-alt);
      border-top: 2px solid var(--border-color);
      border-bottom: 2px solid var(--border-color);
    }

    .section-head {
      text-align: center;
      margin-bottom: 50px;
    }

    .section-badge {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 800;
      padding: 4px 14px;
      border-radius: 20px;
      border: 2px solid var(--border-color);
      background: var(--secondary);
      box-shadow: 2px 2px 0px var(--border-color);
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    .section-title {
      font-size: clamp(1.75rem, 3.5vw, 2.3rem);
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 650px;
      margin: 0 auto;
    }

    /* 数据指标卡片 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: -30px;
      margin-bottom: 50px;
    }

    .metric-card {
      background: var(--bg-card);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      box-shadow: var(--shadow-graffiti);
      text-align: center;
      transition: transform 0.2s ease;
    }

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

    .metric-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .metric-desc {
      font-size: 0.82rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

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

    .card-item {
      background: var(--bg-card);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-graffiti);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: all 0.2s ease;
    }

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

    .card-icon-badge {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      border: 2px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: 900;
      margin-bottom: 18px;
    }

    .bg-pink { background: #ff7675; }
    .bg-yellow { background: var(--accent-yellow); }
    .bg-cyan { background: var(--secondary); }
    .bg-purple { background: #a29bfe; }
    .bg-green { background: #55efc4; }
    .bg-orange { background: #fab1a0; }

    .card-item h3 {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-item p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

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

    .card-tags span {
      font-size: 0.78rem;
      font-weight: 600;
      padding: 3px 8px;
      border-radius: 4px;
      background: var(--bg-alt);
      border: 1px solid var(--border-color);
      color: var(--text-main);
    }

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

    .step-card {
      background: var(--bg-card);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-graffiti);
      position: relative;
    }

    .step-num {
      position: absolute;
      top: -14px;
      left: 18px;
      background: var(--primary);
      color: #fff;
      font-weight: 900;
      font-size: 0.85rem;
      padding: 2px 10px;
      border-radius: 12px;
      border: 2px solid var(--border-color);
    }

    .step-card h3 {
      font-size: 1.15rem;
      font-weight: 800;
      margin-top: 8px;
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 对比评测板 */
    .review-highlight {
      background: var(--bg-card);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      box-shadow: 6px 6px 0px var(--border-color);
      padding: 36px;
      margin-bottom: 40px;
    }

    .review-score-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 2px dashed var(--border-color);
      margin-bottom: 28px;
    }

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

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

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

    .star-rank {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }

    .stars {
      color: #ff9f1a;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
      background: #fff;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-soft);
      font-size: 0.95rem;
    }

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

    .compare-table tr:hover {
      background: rgba(255, 230, 0, 0.08);
    }

    .tag-better {
      display: inline-block;
      background: #d4edda;
      color: #155724;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 4px;
      border: 1px solid #c3e6cb;
    }

    /* 案例中心图文 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--bg-card);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-graffiti);
      display: flex;
      flex-direction: column;
    }

    .case-media {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #eae5dc;
      border-bottom: 2px solid var(--border-color);
      overflow: hidden;
    }

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

    .case-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .case-card:hover .case-media img {
      transform: scale(1.05);
    }

    .case-body {
      padding: 20px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }

    .case-body h3 {
      font-size: 1.15rem;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .case-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-bottom: 14px;
      flex: 1;
    }

    /* 用户评论卡片 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: var(--bg-card);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-graffiti);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 16px;
      font-style: italic;
    }

    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-soft);
      padding-top: 14px;
    }

    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--accent-yellow);
      border: 2px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1rem;
    }

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

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

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-sm);
      box-shadow: 3px 3px 0px var(--border-color);
      overflow: hidden;
    }

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

    .faq-header:hover {
      background: rgba(255, 230, 0, 0.15);
    }

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

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

    .faq-body {
      padding: 0 20px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease-out, padding 0.25s ease;
      background: var(--bg-alt);
      font-size: 0.93rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    .faq-item.active .faq-body {
      padding: 16px 20px 20px;
      max-height: 300px;
      border-top: 1px dashed var(--border-color);
    }

    /* 需求匹配与表单 */
    .form-wrapper-box {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background: var(--bg-card);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: 6px 6px 0px var(--border-color);
    }

    .form-info-panel h3 {
      font-size: 1.6rem;
      font-weight: 900;
      margin-bottom: 16px;
    }

    .form-info-panel p {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 24px;
    }

    .contact-item-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      list-style: none;
    }

    .contact-item-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      font-weight: 600;
    }

    .contact-qr-wrap {
      margin-top: 24px;
      padding: 16px;
      background: var(--bg-alt);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }

    .contact-qr-wrap img {
      width: 130px;
      height: 130px;
      object-fit: contain;
      border: 1px solid var(--border-color);
      border-radius: 4px;
      background: #fff;
    }

    .custom-form {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group label {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 14px;
      font-size: 0.95rem;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #fff;
      font-family: inherit;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.15s ease, box-shadow 0.15s ease;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 3px 3px 0px var(--primary);
    }

    /* 资讯与友情链接 */
    .article-section-box {
      background: var(--bg-card);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-graffiti);
      margin-bottom: 40px;
    }

    .article-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-link-tag {
      background: var(--bg-alt);
      border: 1.5px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 6px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      transition: all 0.15s ease;
    }

    .article-link-tag:hover {
      background: var(--secondary);
      transform: translateY(-2px);
    }

    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
      margin-top: 16px;
    }

    .friend-links-box a {
      font-size: 0.88rem;
      font-weight: 600;
      padding: 4px 12px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 4px;
      color: var(--text-muted);
    }

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

    /* 页脚 */
    .site-footer {
      background: #191b22;
      color: #eaeaea;
      border-top: 3px solid var(--border-color);
      padding: 50px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-size: 1.05rem;
      font-weight: 800;
      color: #ffffff;
      margin-bottom: 16px;
      position: relative;
    }

    .footer-col p {
      font-size: 0.88rem;
      color: #a0a6b5;
      line-height: 1.6;
    }

    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-col ul li a {
      font-size: 0.88rem;
      color: #a0a6b5;
    }

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

    .footer-bottom {
      border-top: 1px solid #2f3542;
      padding-top: 24px;
      text-align: center;
      font-size: 0.82rem;
      color: #8c93a4;
      display: flex;
      flex-direction: column;
      gap: 8px;
      align-items: center;
    }

    /* 浮动客服挂件 */
    .float-dock {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .dock-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--bg-card);
      border: 2px solid var(--border-color);
      box-shadow: 3px 3px 0px var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      cursor: pointer;
      transition: all 0.2s ease;
      position: relative;
    }

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

    .dock-popover {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      width: 180px;
      background: #fff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-graffiti);
      padding: 12px;
      text-align: center;
    }

    .dock-btn:hover .dock-popover {
      display: block;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .cards-grid, .reviews-grid, .case-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid, .step-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .form-wrapper-box {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--bg-card);
        border-bottom: 2px solid var(--border-color);
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 15px rgba(0,0,0,0.1);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-action {
        display: none;
      }
      .cards-grid, .reviews-grid, .case-grid, .metrics-grid, .step-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .review-score-banner {
        flex-direction: column;
        align-items: flex-start;
      }
    }