:root {
      --primary-yellow: #fcd34d;
      --brand-yellow: #f59e0b;
      --accent-yellow: #fbbf24;
      --deep-yellow: #d97706;
      --text-main: #18181b;
      --text-muted: #52525b;
      --text-light: #71717a;
      --bg-page: #fefce8;
      --bg-card: #ffffff;
      --bg-warm: #fffbeb;
      --border-color: #fef08a;
      --border-strong: #fde047;
      --shadow-sm: 0 2px 4px rgba(217, 119, 6, 0.06);
      --shadow-md: 0 6px 18px rgba(217, 119, 6, 0.1);
      --shadow-lg: 0 12px 30px rgba(217, 119, 6, 0.15);
      --radius: 12px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at 10% 10%, #fef9c3 0%, #fefce8 60%, #fffdf0 100%);
      min-height: 100vh;
      overflow-x: hidden;
    }

    .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: 1000;
      background: rgba(255, 253, 240, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }
    .brand-box img.ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .brand-text {
      font-size: 1.25rem;
      font-weight: 800;
      color: #78350f;
      letter-spacing: -0.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links a {
      display: block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      text-decoration: none;
      border-radius: 6px;
      transition: var(--transition);
    }
    .nav-links a:hover {
      color: #b45309;
      background: rgba(254, 240, 138, 0.5);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      font-weight: 700;
      padding: 10px 22px;
      border-radius: 8px;
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
    }
    .btn-primary {
      background: linear-gradient(135deg, #f59e0b, #d97706);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(217, 119, 6, 0.28);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #fbbf24, #d97706);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(217, 119, 6, 0.35);
    }
    .btn-secondary {
      background: #fef08a;
      color: #854d0e;
      border-color: #fde047;
    }
    .btn-secondary:hover {
      background: #fde047;
      transform: translateY(-2px);
    }
    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
      color: var(--text-main);
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 80px 0 60px;
      background: linear-gradient(180deg, rgba(254, 243, 199, 0.4) 0%, rgba(254, 252, 232, 0) 100%);
      position: relative;
    }
    .hero-content {
      text-align: center;
      max-width: 880px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #fef08a;
      border: 1px solid #fde047;
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 700;
      color: #854d0e;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      color: #451a03;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: #78350f;
      line-height: 1.7;
      margin-bottom: 36px;
    }
    .hero-btns {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-btn-large {
      padding: 14px 34px;
      font-size: 1.05rem;
      border-radius: 10px;
    }
    .hero-highlight-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 50px;
    }
    .hero-highlight-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 24px 18px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .hero-highlight-card:hover {
      transform: translateY(-4px);
      border-color: var(--brand-yellow);
      box-shadow: var(--shadow-md);
    }
    .hero-card-num {
      font-size: 1.8rem;
      font-weight: 900;
      color: #b45309;
      margin-bottom: 6px;
    }
    .hero-card-label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    /* 模块通用样式 */
    .section-wrap {
      padding: 70px 0;
      position: relative;
    }
    .section-alt {
      background-color: #fffdf5;
      border-top: 1px solid #fef08a;
      border-bottom: 1px solid #fef08a;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }
    .section-tag {
      font-size: 0.85rem;
      font-weight: 800;
      color: #b45309;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: #451a03;
      margin-bottom: 12px;
    }
    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 平台介绍 */
    .platform-features {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .feature-box:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent-yellow);
    }
    .feature-icon-badge {
      width: 44px;
      height: 44px;
      background: #fef3c7;
      color: #b45309;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 8px;
      font-weight: 800;
      font-size: 1.2rem;
      margin-bottom: 18px;
    }
    .feature-box h3 {
      font-size: 1.25rem;
      color: #451a03;
      margin-bottom: 10px;
    }
    .feature-box p {
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.65;
    }

    /* 矩阵场景 - 一站式制作 */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .matrix-card {
      background: #ffffff;
      border: 1px solid #fef08a;
      border-radius: var(--radius);
      padding: 22px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .matrix-card:hover {
      border-color: #f59e0b;
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }
    .matrix-head {
      margin-bottom: 12px;
    }
    .matrix-title {
      font-size: 1.15rem;
      font-weight: 800;
      color: #78350f;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .matrix-desc {
      font-size: 0.88rem;
      color: #52525b;
      margin-top: 8px;
      line-height: 1.55;
    }
    .matrix-tag {
      font-size: 0.75rem;
      background: #fef9c3;
      color: #854d0e;
      padding: 2px 8px;
      border-radius: 4px;
      font-weight: 600;
    }

    /* 聚合生态标签 */
    .model-tags-wrapper {
      margin-top: 36px;
      background: #fffbeb;
      border: 1px dashed #fcd34d;
      padding: 24px;
      border-radius: var(--radius);
      text-align: center;
    }
    .model-tags-title {
      font-size: 1rem;
      font-weight: 800;
      color: #78350f;
      margin-bottom: 14px;
    }
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }
    .tag-item {
      background: #ffffff;
      border: 1px solid #fef08a;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      color: #92400e;
      transition: var(--transition);
    }
    .tag-item:hover {
      background: #fef08a;
      color: #451a03;
    }

    /* 流程步骤 */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .process-step {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 26px 20px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .step-number {
      width: 48px;
      height: 48px;
      background: linear-gradient(135deg, #fde047, #f59e0b);
      color: #451a03;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: 900;
      margin: 0 auto 16px;
    }
    .process-step h3 {
      font-size: 1.15rem;
      color: #451a03;
      margin-bottom: 8px;
    }
    .process-step p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比评测 */
    .eval-card {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }
    .eval-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 24px;
      border-bottom: 1px solid #fef08a;
      margin-bottom: 28px;
      flex-wrap: wrap;
      gap: 16px;
    }
    .eval-score-box {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .eval-score-num {
      font-size: 3rem;
      font-weight: 900;
      color: #d97706;
      line-height: 1;
    }
    .eval-score-total {
      font-size: 1.1rem;
      color: var(--text-muted);
      font-weight: 600;
    }
    .eval-stars {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
    }
    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .eval-table th, .eval-table td {
      padding: 14px 18px;
      font-size: 0.95rem;
      border-bottom: 1px solid #fef9c3;
    }
    .eval-table th {
      background: #fefce8;
      color: #78350f;
      font-weight: 800;
    }
    .eval-table tr:hover td {
      background: #fffbeb;
    }
    .highlight-cell {
      font-weight: 700;
      color: #b45309;
    }

    /* 案例中心 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--brand-yellow);
    }
    .case-media {
      aspect-ratio: 16 / 9;
      background: #fef08a;
      overflow: hidden;
    }
    .case-media.square {
      aspect-ratio: 1 / 1;
    }
    .case-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }
    .case-body {
      padding: 22px;
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .case-body h3 {
      font-size: 1.15rem;
      color: #451a03;
      margin-bottom: 8px;
    }
    .case-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-quote {
      font-size: 0.92rem;
      color: #3f3f46;
      line-height: 1.65;
      margin-bottom: 18px;
      position: relative;
    }
    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #fef9c3;
      padding-top: 14px;
    }
    .reviewer-avatar {
      width: 40px;
      height: 40px;
      background: #fde047;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: #78350f;
    }
    .reviewer-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: #18181b;
    }
    .reviewer-role {
      font-size: 0.8rem;
      color: #71717a;
    }

    /* 常见问题 FAQ */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item.active {
      border-color: var(--brand-yellow);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 700;
      color: #451a03;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-question::after {
      content: '+';
      font-size: 1.4rem;
      color: #b45309;
      font-weight: 400;
      transition: var(--transition);
    }
    .faq-item.active .faq-question::after {
      transform: rotate(45deg);
    }
    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* 需求表单与联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: start;
    }
    .form-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 34px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      color: #451a03;
      margin-bottom: 8px;
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #fef08a;
      background: #fefce8;
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: #f59e0b;
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.15);
    }
    .contact-info-panel {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 34px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
    }
    .contact-info-panel h3 {
      font-size: 1.4rem;
      color: #451a03;
      margin-bottom: 20px;
    }
    .contact-item {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
      font-size: 0.95rem;
      color: var(--text-muted);
    }
    .contact-item strong {
      color: #78350f;
      min-width: 80px;
    }
    .qrcode-box {
      margin-top: 24px;
      padding: 18px;
      background: #fffbeb;
      border-radius: 8px;
      border: 1px dashed #fcd34d;
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .qrcode-box img {
      width: 110px;
      height: 110px;
      border-radius: 6px;
      border: 1px solid #fde047;
      display: block;
    }
    .qrcode-desc {
      font-size: 0.9rem;
      color: #78350f;
    }

    /* 行业资讯 & 友情链接 */
    .links-block {
      margin-top: 40px;
      padding-top: 30px;
      border-top: 1px solid var(--border-color);
    }
    .links-title {
      font-size: 1rem;
      font-weight: 800;
      color: #78350f;
      margin-bottom: 14px;
    }
    .links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .links-list a {
      font-size: 0.9rem;
      color: var(--text-muted);
      text-decoration: none;
      background: #ffffff;
      padding: 6px 14px;
      border-radius: 6px;
      border: 1px solid var(--border-color);
      transition: var(--transition);
    }
    .links-list a:hover {
      color: #b45309;
      border-color: var(--brand-yellow);
    }

    /* 页脚 */
    .site-footer {
      background: #fffdf0;
      border-top: 2px solid var(--border-color);
      padding: 40px 0 24px;
      margin-top: 60px;
      color: #52525b;
      font-size: 0.9rem;
    }
    .footer-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 1px solid #fef08a;
    }
    .footer-brand-wrap {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .footer-copy {
      text-align: center;
      padding-top: 20px;
      color: #71717a;
      font-size: 0.85rem;
    }

    /* 浮动组件 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 40px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }
    .tool-btn {
      width: 46px;
      height: 46px;
      background: #f59e0b;
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      box-shadow: var(--shadow-md);
      font-size: 0.85rem;
      font-weight: 700;
      border: 1px solid #fde047;
      transition: var(--transition);
      cursor: pointer;
    }
    .tool-btn:hover {
      background: #d97706;
      transform: scale(1.06);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title { font-size: 2.2rem; }
      .hero-highlight-grid { grid-template-columns: repeat(2, 1fr); }
      .platform-features { grid-template-columns: repeat(2, 1fr); }
      .matrix-grid { grid-template-columns: repeat(2, 1fr); }
      .process-timeline { grid-template-columns: repeat(2, 1fr); }
      .case-grid { grid-template-columns: repeat(2, 1fr); }
      .reviews-grid { grid-template-columns: repeat(2, 1fr); }
      .contact-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 2px solid var(--border-color);
        padding: 20px;
        box-shadow: var(--shadow-md);
      }
      .nav-menu.show { display: block; }
      .nav-links {
        flex-direction: column;
        align-items: stretch;
      }
      .nav-links a {
        padding: 12px 16px;
        border-bottom: 1px solid #fef9c3;
      }
      .menu-toggle { display: block; }
      .hero-title { font-size: 1.8rem; }
      .hero-highlight-grid { grid-template-columns: 1fr; }
      .platform-features { grid-template-columns: 1fr; }
      .matrix-grid { grid-template-columns: 1fr; }
      .process-timeline { grid-template-columns: 1fr; }
      .case-grid { grid-template-columns: 1fr; }
      .reviews-grid { grid-template-columns: 1fr; }
      .footer-content { flex-direction: column; text-align: center; }
      .form-container, .contact-info-panel { padding: 22px; }
    }