:root {
      --primary-yellow: #FFD000;
      --primary-hover: #F0C400;
      --accent-gold: #FFB300;
      --light-yellow-bg: #FFFDF0;
      --light-yellow-card: #FFFBE6;
      --dark-title: #1A1A1A;
      --dark-body: #374151;
      --muted-gray: #6B7280;
      --border-color: #E5E7EB;
      --card-bg: #FFFFFF;
      --bg-main: #FAF9F5;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 6px 16px rgba(255, 208, 0, 0.15);
      --shadow-lg: 0 12px 30px rgba(0,0,0,0.08);
      --radius: 12px;
      --transition: all 0.28s ease-in-out;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--dark-body);
      line-height: 1.65;
      overflow-x: hidden;
    }

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

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

    .ai-container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .section-padding {
      padding: 72px 0;
      border-bottom: 1px solid #ECEAE4;
    }

    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }

    .badge-label {
      display: inline-block;
      background: var(--primary-yellow);
      color: var(--dark-title);
      font-size: 13px;
      font-weight: 700;
      padding: 4px 14px;
      border-radius: 999px;
      letter-spacing: 0.5px;
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--dark-title);
      margin-bottom: 12px;
      line-height: 1.35;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--muted-gray);
      max-width: 720px;
      margin: 0 auto;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(229, 231, 235, 0.8);
    }

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

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

    .logo-wrapper {
      max-height: 42px;
      display: flex;
      align-items: center;
    }

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

    .nav-links li a {
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 600;
      color: var(--dark-body);
      border-radius: 6px;
    }

    .nav-links li a:hover {
      color: var(--dark-title);
      background: var(--light-yellow-card);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 15px;
      font-weight: 700;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }

    .btn-primary {
      background: var(--primary-yellow);
      color: var(--dark-title);
      box-shadow: 0 4px 12px rgba(255, 208, 0, 0.35);
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(255, 208, 0, 0.45);
    }

    .btn-outline {
      background: #FFFFFF;
      border: 1px solid #D1D5DB;
      color: var(--dark-title);
    }

    .btn-outline:hover {
      border-color: var(--primary-yellow);
      background: var(--light-yellow-bg);
      color: var(--dark-title);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--dark-title);
      padding: 6px;
    }

    /* Hero 首屏 (无图规范) */
    .hero-section {
      background: radial-gradient(circle at 50% 10%, #FFFBE6 0%, #FAF9F5 80%);
      padding: 80px 0 64px 0;
      border-bottom: 1px solid #EFECE6;
      text-align: center;
    }

    .hero-content {
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #FFFFFF;
      border: 1px solid #FCD34D;
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 700;
      color: #92400E;
      margin-bottom: 24px;
      box-shadow: 0 2px 8px rgba(252, 211, 77, 0.2);
    }

    .hero-title {
      font-size: 40px;
      font-weight: 900;
      color: var(--dark-title);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 18px;
      color: #4B5563;
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .btn-hero-launch {
      background: linear-gradient(135deg, #FFD000 0%, #FFB300 100%);
      color: #111827;
      font-size: 18px;
      font-weight: 800;
      padding: 15px 36px;
      border-radius: 10px;
      box-shadow: 0 10px 24px rgba(255, 179, 0, 0.38);
      border: none;
    }

    .btn-hero-launch:hover {
      transform: translateY(-3px);
      box-shadow: 0 14px 28px rgba(255, 179, 0, 0.48);
    }

    /* 纯数字指标卡片 */
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 24px;
    }

    .hero-stat-card {
      background: #FFFFFF;
      border: 1px solid #F3F4F6;
      border-top: 4px solid var(--primary-yellow);
      padding: 22px 16px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: left;
    }

    .hero-stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .stat-number {
      font-size: 28px;
      font-weight: 900;
      color: var(--dark-title);
      margin-bottom: 4px;
    }

    .stat-text {
      font-size: 13px;
      color: var(--muted-gray);
      line-height: 1.4;
    }

    /* 模块通用卡片排版 */
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

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

    .ui-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
    }

    .ui-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.07);
      border-color: #FCD34D;
    }

    .card-icon-pill {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: #FFFBE6;
      color: #B45309;
      font-weight: 800;
      font-size: 14px;
      padding: 6px 12px;
      border-radius: 6px;
      margin-bottom: 16px;
    }

    .card-title {
      font-size: 19px;
      font-weight: 700;
      color: var(--dark-title);
      margin-bottom: 10px;
      line-height: 1.4;
    }

    .card-desc {
      font-size: 14px;
      color: var(--dark-body);
      line-height: 1.6;
    }

    /* 模型矩阵胶囊标签 */
    .models-tag-box {
      background: #FFFFFF;
      border: 1px solid #F3E8A2;
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 14px;
    }

    .tag-item {
      background: #FFFDF0;
      border: 1px solid #FDE68A;
      color: #78350F;
      padding: 7px 14px;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 600;
      transition: var(--transition);
    }

    .tag-item:hover {
      background: var(--primary-yellow);
      color: #000000;
      border-color: var(--primary-yellow);
    }

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

    .step-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 44px;
      height: 44px;
      background: var(--primary-yellow);
      color: var(--dark-title);
      font-size: 18px;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px auto;
      box-shadow: 0 4px 10px rgba(255, 208, 0, 0.4);
    }

    /* 评测与对比表格 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #FFFBE6 0%, #FFFFFF 100%);
      border: 2px solid #FCD34D;
      border-radius: var(--radius);
      padding: 32px;
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }

    .eval-score-wrap {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .big-score {
      font-size: 54px;
      font-weight: 900;
      color: #92400E;
      line-height: 1;
    }

    .score-stars {
      color: #F59E0B;
      font-size: 24px;
      letter-spacing: 2px;
    }

    .table-responsive {
      overflow-x: auto;
      background: #FFFFFF;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      font-size: 14px;
      border-bottom: 1px solid #F3F4F6;
    }

    .compare-table th {
      background: #FAF9F5;
      color: var(--dark-title);
      font-weight: 700;
    }

    .compare-table tr:hover td {
      background: #FFFDF5;
    }

    .highlight-cell {
      background: #FFFBE6;
      font-weight: 700;
      color: #92400E;
    }

    /* 案例图片排版 */
    .media-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .media-frame {
      width: 100%;
      background: #F3F4F6;
      overflow: hidden;
    }

    .media-frame img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .media-card:hover .media-frame img {
      transform: scale(1.03);
    }

    .media-info {
      padding: 20px;
      flex-grow: 1;
    }

    /* 表单系统 */
    .form-box {
      background: #FFFFFF;
      border: 1px solid #FCD34D;
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-md);
      max-width: 760px;
      margin: 0 auto;
    }

    .form-group {
      margin-bottom: 20px;
      text-align: left;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 700;
      color: var(--dark-title);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 14px;
      border: 1px solid #D1D5DB;
      border-radius: 8px;
      background: #FAF9F5;
      outline: none;
      transition: var(--transition);
      color: var(--dark-title);
    }

    .form-control:focus {
      border-color: #F59E0B;
      background: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(254, 240, 138, 0.4);
    }

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

    /* FAQ 手风琴 */
    .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: #FCD34D;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 22px;
      font-size: 16px;
      font-weight: 700;
      color: var(--dark-title);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }

    .faq-icon {
      font-size: 18px;
      font-weight: 700;
      color: #92400E;
      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;
      background: #FFFDF7;
    }

    .faq-answer-inner {
      padding: 0 22px 18px 22px;
      font-size: 14px;
      color: #4B5563;
      line-height: 1.65;
    }

    /* 客户评价卡片 */
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
      padding-top: 14px;
      border-top: 1px solid #F3F4F6;
    }

    .review-avatar {
      width: 42px;
      height: 42px;
      background: #FEF08A;
      color: #854D0E;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
    }

    .review-meta h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--dark-title);
    }

    .review-meta p {
      font-size: 12px;
      color: var(--muted-gray);
    }

    /* 文章列表与外链 */
    .article-link-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 20px;
    }

    .article-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 18px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      transition: var(--transition);
    }

    .article-item:hover {
      border-color: #FCD34D;
      background: #FFFDF0;
      transform: translateX(4px);
    }

    /* 底部专属样式 */
    .site-footer {
      background: #111827;
      color: #D1D5DB;
      padding: 60px 0 30px 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 48px;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 18px;
      border-left: 3px solid var(--primary-yellow);
      padding-left: 10px;
    }

    .footer-col p {
      font-size: 13px;
      color: #9CA3AF;
      line-height: 1.7;
      margin-bottom: 12px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links li a {
      color: #9CA3AF;
      font-size: 13px;
    }

    .footer-links li a:hover {
      color: var(--primary-yellow);
    }

    .qr-container {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-top: 14px;
    }

    .qr-card {
      background: #FFFFFF;
      padding: 8px;
      border-radius: 8px;
      width: 105px;
      text-align: center;
    }

    .qr-card img {
      width: 100%;
      height: auto;
    }

    .qr-card span {
      display: block;
      color: #374151;
      font-size: 11px;
      font-weight: 700;
      margin-top: 4px;
    }

    .footer-bottom {
      border-top: 1px solid #1F2937;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
      color: #9CA3AF;
    }

    .friendship-links {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 10px;
    }

    .friendship-links a {
      color: #9CA3AF;
      font-size: 12px;
    }

    .friendship-links a:hover {
      color: var(--primary-yellow);
    }

    /* 悬浮客服与返回顶部 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: var(--primary-yellow);
      color: var(--dark-title);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(0,0,0,0.15);
      cursor: pointer;
      font-size: 20px;
      font-weight: bold;
      border: none;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary-hover);
      transform: translateY(-3px);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 32px;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cards-grid-4, .cards-grid-3, .step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .site-header.mobile-open .nav-links {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
        gap: 8px;
      }
      .site-header.mobile-open .nav-links li a {
        display: block;
        padding: 10px 16px;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 26px;
      }
      .section-title {
        font-size: 24px;
      }
      .hero-stats-grid, .cards-grid-4, .cards-grid-3, .cards-grid-2, .step-list {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .eval-highlight-box {
        flex-direction: column;
        align-items: flex-start;
      }
      .hero-cta-group {
        flex-direction: column;
        width: 100%;
      }
      .hero-cta-group .btn {
        width: 100%;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }