:root {
      --primary: #FFB800;
      --primary-hover: #E5A600;
      --primary-light: #FFF8E7;
      --primary-accent: #FF9900;
      --dark-text: #1E2229;
      --body-text: #4B525D;
      --muted-text: #7A828E;
      --bg-page: #FBFBFA;
      --bg-card: #FFFFFF;
      --border-color: #EFECE6;
      --border-focus: #FFC425;
      --shadow-sm: 0 4px 12px rgba(25, 23, 17, 0.04);
      --shadow-md: 0 10px 24px rgba(25, 23, 17, 0.06);
      --shadow-hover: 0 14px 32px rgba(255, 184, 0, 0.16);
      --radius: 12px;
      --max-width: 1200px;
      --transition: all 0.28s ease;
    }

    * {
      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", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-page);
      color: var(--dark-text);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: radial-gradient(circle at 90% 10%, rgba(255, 184, 0, 0.06) 0%, transparent 40%),
                        radial-gradient(circle at 10% 40%, rgba(255, 184, 0, 0.04) 0%, transparent 35%);
      background-attachment: fixed;
    }

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

    /* 统一容器标准 */
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background-color: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .nav-bar {
      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-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--dark-text);
      letter-spacing: -0.5px;
    }

    .brand-name span {
      color: var(--primary-accent);
    }

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

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--body-text);
      padding: 8px 14px;
      border-radius: 6px;
      display: inline-block;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--dark-text);
      background-color: var(--primary-light);
    }

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

    .btn-nav-primary {
      background-color: var(--primary);
      color: #000;
      font-weight: 600;
      font-size: 0.9rem;
      padding: 9px 20px;
      border-radius: 30px;
      box-shadow: 0 4px 10px rgba(255, 184, 0, 0.28);
      border: 1px solid transparent;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-nav-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-1px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .mobile-menu-btn span {
      display: block;
      width: 22px;
      height: 2px;
      background: var(--dark-text);
      margin: 4px 0;
      transition: 0.3s;
    }

    /* 公共区段与标题 */
    section {
      padding: 64px 0;
      position: relative;
    }

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 44px;
    }

    .section-badge {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      padding: 4px 14px;
      border-radius: 20px;
      background-color: var(--primary-light);
      color: #996800;
      border: 1px solid rgba(255, 184, 0, 0.35);
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--dark-text);
      line-height: 1.3;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--body-text);
      line-height: 1.65;
    }

    /* 首屏 Hero 区域 (无图片规范) */
    .hero-section {
      padding: 80px 0 60px;
      background: linear-gradient(180deg, #FFFFFF 0%, #FFFDF5 60%, var(--bg-page) 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }

    .hero-tagline {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #FFF8E6;
      border: 1px solid #FFE08A;
      color: #945B00;
      font-size: 0.9rem;
      font-weight: 600;
      padding: 6px 18px;
      border-radius: 50px;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--dark-text);
      letter-spacing: -1px;
      margin-bottom: 20px;
    }

    .hero-title .highlight {
      background: linear-gradient(180deg, transparent 65%, #FFE27A 65%);
      padding: 0 4px;
      display: inline-block;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--body-text);
      max-width: 720px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

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

    .btn-hero-primary {
      background-color: var(--primary);
      color: #111;
      font-size: 1.1rem;
      font-weight: 700;
      padding: 14px 38px;
      border-radius: 40px;
      box-shadow: 0 8px 24px rgba(255, 184, 0, 0.4);
      border: 2px solid transparent;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .btn-hero-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(255, 184, 0, 0.5);
    }

    .btn-hero-secondary {
      background-color: #FFF;
      color: var(--dark-text);
      font-size: 1.05rem;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 40px;
      border: 1px solid #D6D2C4;
      box-shadow: var(--shadow-sm);
    }

    .btn-hero-secondary:hover {
      background-color: #FAF8F2;
      border-color: #BDB7A4;
      transform: translateY(-2px);
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }

    .metric-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      position: relative;
      overflow: hidden;
      transition: var(--transition);
    }

    .metric-card::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--primary);
      transform: scaleX(0);
      transform-origin: left;
      transition: transform 0.3s ease;
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #FFDE82;
    }

    .metric-card:hover::after {
      transform: scaleX(1);
    }

    .metric-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--dark-text);
      display: block;
      margin-bottom: 4px;
    }

    .metric-num em {
      font-style: normal;
      color: var(--primary-accent);
      font-size: 1.4rem;
      margin-left: 2px;
    }

    .metric-label {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--muted-text);
    }

    /* 模型矩阵徽章 */
    .model-matrix-wrap {
      background: #FFFFFF;
      border: 1px dashed #E5DECD;
      border-radius: var(--radius);
      padding: 24px;
      margin-top: 40px;
      text-align: center;
    }

    .model-matrix-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--muted-text);
      margin-bottom: 16px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .model-tags-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .model-chip {
      background: #F7F5EE;
      color: #33383F;
      font-size: 0.85rem;
      font-weight: 600;
      padding: 5px 14px;
      border-radius: 20px;
      border: 1px solid #ECE7D9;
      transition: var(--transition);
    }

    .model-chip:hover {
      background: var(--primary);
      color: #000;
      border-color: var(--primary);
      transform: scale(1.05);
    }

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

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

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

    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #FFDC73;
    }

    .card-icon-pill {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: #8C5D00;
      font-size: 1.25rem;
      margin-bottom: 20px;
      border: 1px solid #FFE699;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--dark-text);
      margin-bottom: 12px;
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--body-text);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .card-feature-list {
      list-style: none;
      margin-top: auto;
      padding-top: 16px;
      border-top: 1px dashed var(--border-color);
    }

    .card-feature-list li {
      font-size: 0.88rem;
      color: var(--muted-text);
      margin-bottom: 6px;
      position: relative;
      padding-left: 18px;
    }

    .card-feature-list li::before {
      content: "✓";
      position: absolute;
      left: 0;
      color: var(--primary-accent);
      font-weight: bold;
    }

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

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

    .step-badge {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 800;
      background: var(--primary);
      color: #000;
      padding: 3px 10px;
      border-radius: 4px;
      margin-bottom: 12px;
    }

    .step-box h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .step-box p {
      font-size: 0.9rem;
      color: var(--body-text);
    }

    /* 案例展示区图片容器 */
    .case-media-box {
      border-radius: var(--radius);
      overflow: hidden;
      background: #EEECE6;
      border: 1px solid var(--border-color);
      aspect-ratio: 16 / 9;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
    }

    .case-media-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

    .case-media-box:hover img {
      transform: scale(1.03);
    }

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

    /* 对比评测高亮表 */
    .benchmark-table-wrap {
      background: #FFFFFF;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

    .score-banner {
      background: linear-gradient(90deg, #FFF7D6 0%, #FFFDF5 100%);
      border-bottom: 1px solid #FFEAA8;
      padding: 24px 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
    }

    .score-left h3 {
      font-size: 1.35rem;
      font-weight: 800;
      color: #4A3300;
      margin-bottom: 4px;
    }

    .score-left p {
      font-size: 0.95rem;
      color: #7A5B14;
    }

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

    .score-rating {
      color: #FF9900;
      font-size: 1.5rem;
      letter-spacing: 2px;
    }

    .score-digits {
      font-size: 2.4rem;
      font-weight: 900;
      color: #2D2000;
      line-height: 1;
    }

    .score-digits em {
      font-size: 1.1rem;
      font-weight: 600;
      color: #776B55;
      font-style: normal;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

    .compare-table th, 
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    .compare-table th {
      background: #FAF8F2;
      color: var(--dark-text);
      font-weight: 700;
    }

    .compare-table tr:last-child td {
      border-bottom: none;
    }

    .compare-highlight {
      background: #FFFDEE;
      font-weight: 700;
      color: #8C5500;
    }

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

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-header {
      width: 100%;
      background: none;
      border: none;
      padding: 18px 24px;
      text-align: left;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--dark-text);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
    }

    .faq-header:hover {
      background-color: #FFFAEC;
    }

    .faq-icon {
      font-size: 1.2rem;
      font-weight: 400;
      transition: transform 0.3s ease;
      color: var(--primary-accent);
    }

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

    .faq-body {
      padding: 0 24px 20px 24px;
      font-size: 0.95rem;
      color: var(--body-text);
      line-height: 1.65;
      display: none;
    }

    .faq-item.open .faq-body {
      display: block;
    }

    /* 评论卡片 */
    .testimonial-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;
    }

    .user-profile {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary);
      color: #000;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1rem;
    }

    .user-info h4 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--dark-text);
    }

    .user-info p {
      font-size: 0.85rem;
      color: var(--muted-text);
    }

    .testimonial-quote {
      font-size: 0.95rem;
      color: var(--body-text);
      line-height: 1.6;
    }

    /* 表单与需求匹配 */
    .form-wrapper {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 36px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group-full {
      grid-column: span 2;
    }

    .form-label {
      display: block;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--dark-text);
      margin-bottom: 8px;
    }

    .form-input, 
    .form-select, 
    .form-textarea {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid #DCD8CB;
      border-radius: 8px;
      background: #FAFAFA;
      color: var(--dark-text);
      transition: var(--transition);
      outline: none;
    }

    .form-input:focus, 
    .form-select:focus, 
    .form-textarea:focus {
      border-color: var(--primary-accent);
      background: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(255, 184, 0, 0.18);
    }

    .form-textarea {
      min-height: 120px;
      resize: vertical;
    }

    .btn-submit {
      width: 100%;
      background-color: var(--primary);
      color: #000000;
      font-size: 1.05rem;
      font-weight: 700;
      padding: 14px;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      box-shadow: 0 6px 18px rgba(255, 184, 0, 0.35);
      transition: var(--transition);
    }

    .btn-submit:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
    }

    /* 宣传图画廊 */
    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .banner-box {
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .banner-box .ai-page-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    /* 行业资讯 & 最新文章 */
    .article-links-container {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
    }

    .article-link-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
    }

    .article-item a {
      font-size: 0.95rem;
      color: var(--body-text);
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 10px 14px;
      border-radius: 6px;
      background: #FAF8F2;
    }

    .article-item a:hover {
      color: #945B00;
      background: #FFF4D1;
    }

    .article-item a::before {
      content: "•";
      color: var(--primary-accent);
      font-weight: bold;
      font-size: 1.2rem;
    }

    /* 联系我们与二维码卡片 */
    .contact-card-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr;
      gap: 24px;
      align-items: center;
    }

    .contact-info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 14px;
      font-size: 1.05rem;
      color: var(--dark-text);
    }

    .contact-icon {
      width: 40px;
      height: 40px;
      border-radius: 8px;
      background: var(--primary-light);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #8C5D00;
      border: 1px solid #FFE48F;
    }

    .qr-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .qr-card img {
      max-width: 160px;
      height: auto;
      border-radius: 8px;
      border: 1px solid #ECE7D9;
      margin-bottom: 12px;
      display: inline-block;
    }

    .qr-card p {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--muted-text);
    }

    /* 页脚 */
    .site-footer {
      background-color: #191B1F;
      color: #99A1AF;
      padding: 56px 0 24px;
      border-top: 3px solid var(--primary);
    }

    .footer-top-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      padding-bottom: 40px;
      border-bottom: 1px solid #2B303A;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-col p {
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 14px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links-list li a {
      color: #99A1AF;
      font-size: 0.9rem;
    }

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

    .footer-friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .footer-friend-links a {
      font-size: 0.88rem;
      color: #99A1AF;
      background: #252A33;
      padding: 4px 10px;
      border-radius: 4px;
    }

    .footer-friend-links a:hover {
      background: var(--primary);
      color: #000;
    }

    .footer-bottom {
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.88rem;
    }

    .footer-bottom a {
      color: #99A1AF;
      margin-right: 12px;
    }

    .footer-bottom a:hover {
      color: var(--primary);
    }

    /* 悬浮客服面板 */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background-color: var(--primary);
      color: #000;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(0,0,0,0.18);
      font-size: 1.2rem;
      cursor: pointer;
      border: none;
      transition: var(--transition);
    }

    .float-btn:hover {
      transform: scale(1.1);
      background-color: var(--primary-hover);
    }

    /* 响应式媒体查询 */
    @media (max-width: 1024px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .workflow-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.7rem;
      }
      .grid-3, .grid-2, .grid-4 {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .contact-card-grid {
        grid-template-columns: 1fr;
      }
      .article-link-list {
        grid-template-columns: 1fr;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
      .banner-gallery {
        grid-template-columns: 1fr;
      }
      .workflow-timeline {
        grid-template-columns: 1fr;
      }
    }