:root {
      --primary: #059669;
      --primary-light: #10b981;
      --primary-soft: #ecfdf5;
      --primary-mint: #d1fae5;
      --accent: #0284c7;
      --bg-base: #f7faf8;
      --bg-surface: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-sub: #64748b;
      --border-color: #d1e7dd;
      --shadow-sm: 0 2px 6px rgba(5, 150, 105, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(5, 150, 105, 0.1), 0 8px 10px -6px rgba(5, 150, 105, 0.05);
      --shadow-lg: 0 20px 30px -10px rgba(15, 23, 42, 0.08);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.28s ease;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.65;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }
    .brand-text {
      display: flex;
      flex-direction: column;
    }
    .brand-name {
      font-size: 19px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.2px;
      line-height: 1.2;
    }
    .brand-tagline {
      font-size: 11px;
      color: var(--text-sub);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-item a {
      padding: 8px 14px;
      color: var(--text-muted);
      font-weight: 500;
      font-size: 14px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }
    .nav-item a:hover {
      color: var(--primary);
      background-color: var(--primary-soft);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 8px 18px;
      background: linear-gradient(135deg, var(--primary), #047857);
      color: #ffffff !important;
      font-weight: 600;
      font-size: 13px;
      border-radius: 999px;
      box-shadow: 0 4px 12px rgba(5, 150, 105, 0.25);
    }
    .btn-nav-portal:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(5, 150, 105, 0.35);
    }
    .nav-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      padding: 6px 10px;
      font-size: 18px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 区域统一间距与标题 */
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }
    .section-alt {
      background-color: #ffffff;
      border-top: 1px solid rgba(209, 231, 221, 0.6);
      border-bottom: 1px solid rgba(209, 231, 221, 0.6);
    }
    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 52px auto;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: var(--primary-mint);
      color: var(--primary);
      font-size: 12px;
      font-weight: 700;
      border-radius: 999px;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 首屏 Hero (严禁出现图片) */
    .hero-section {
      padding: 90px 0 80px 0;
      background: radial-gradient(circle at 50% 10%, rgba(16, 185, 129, 0.12) 0%, rgba(247, 250, 248, 0) 70%), linear-gradient(180deg, #f0fdf4 0%, #f7faf8 100%);
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .hero-decor-orb-1 {
      position: absolute;
      top: -120px;
      left: 10%;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(16, 185, 129, 0.15) 0%, transparent 70%);
      pointer-events: none;
      filter: blur(50px);
    }
    .hero-decor-orb-2 {
      position: absolute;
      top: 20%;
      right: 5%;
      width: 350px;
      height: 350px;
      background: radial-gradient(circle, rgba(2, 132, 199, 0.12) 0%, transparent 70%);
      pointer-events: none;
      filter: blur(50px);
    }
    .hero-eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 999px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }
    .hero-eyebrow-dot {
      width: 8px;
      height: 8px;
      background-color: var(--primary);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 0 4px rgba(5, 150, 105, 0.2);
    }
    .hero-title {
      font-size: 44px;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      max-width: 920px;
      margin: 0 auto 24px auto;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      color: var(--primary);
      position: relative;
      display: inline-block;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto 36px auto;
      line-height: 1.75;
    }
    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .btn-hero-primary {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 15px 36px;
      background: linear-gradient(135deg, #059669 0%, #10b981 100%);
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      border-radius: 12px;
      box-shadow: 0 8px 20px rgba(5, 150, 105, 0.35);
      border: none;
    }
    .btn-hero-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(5, 150, 105, 0.45);
      color: #ffffff;
    }
    .btn-hero-secondary {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 15px 32px;
      background: #ffffff;
      color: var(--text-main);
      font-size: 16px;
      font-weight: 600;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .btn-hero-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: var(--primary-soft);
    }
    .hero-stats-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1020px;
      margin: 0 auto;
      background: #ffffff;
      padding: 24px 32px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .stat-item {
      text-align: center;
      border-right: 1px solid #edf2f7;
    }
    .stat-item:last-child {
      border-right: none;
    }
    .stat-value {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }
    .stat-label {
      font-size: 13px;
      color: var(--text-sub);
      margin-top: 4px;
    }

    /* 平台矩阵标签云 */
    .model-chips {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 36px;
      max-width: 980px;
      margin-left: auto;
      margin-right: auto;
    }
    .model-chip {
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 999px;
      font-size: 12px;
      font-weight: 600;
      color: var(--text-muted);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .model-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-1px);
    }

    /* 服务场景网格 */
    .grid-3col {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4col {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .service-card {
      background: #ffffff;
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-light);
    }
    .service-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--primary-mint);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 20px;
      font-weight: 800;
    }
    .service-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .service-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
      margin-bottom: 16px;
    }
    .service-badge-tag {
      align-self: flex-start;
      font-size: 11px;
      padding: 3px 10px;
      background: var(--primary-soft);
      color: var(--primary);
      border-radius: 4px;
      font-weight: 600;
    }

    /* 图文两栏组合 */
    .feature-split {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
      margin-bottom: 50px;
    }
    .feature-split.reverse {
      direction: rtl;
    }
    .feature-split.reverse > * {
      direction: ltr;
    }
    .media-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
      background: #ffffff;
    }
    .media-box img {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
    }
    .media-box:hover img {
      transform: scale(1.02);
    }
    .feature-content h3 {
      font-size: 26px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.35;
    }
    .feature-content p {
      color: var(--text-muted);
      font-size: 15px;
      line-height: 1.75;
      margin-bottom: 22px;
    }
    .feature-checklist {
      list-style: none;
      margin-bottom: 24px;
    }
    .feature-checklist li {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 14px;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .feature-check-icon {
      color: var(--primary);
      font-weight: bold;
    }

    /* 流程步骤 */
    .steps-container {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: #ffffff;
      padding: 28px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: left;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .step-number {
      font-size: 32px;
      font-weight: 900;
      color: var(--primary-mint);
      line-height: 1;
      margin-bottom: 12px;
    }
    .step-title {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .step-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 对比评测模块 */
    .rating-banner {
      background: linear-gradient(135deg, #065f46, #059669);
      color: #ffffff;
      padding: 32px 40px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
      margin-bottom: 36px;
      box-shadow: var(--shadow-md);
    }
    .rating-info {
      display: flex;
      align-items: center;
      gap: 24px;
    }
    .rating-score-box {
      background: rgba(255, 255, 255, 0.15);
      border: 1px solid rgba(255, 255, 255, 0.25);
      padding: 12px 24px;
      border-radius: 12px;
      text-align: center;
    }
    .score-num {
      font-size: 38px;
      font-weight: 900;
      line-height: 1;
    }
    .score-total {
      font-size: 14px;
      opacity: 0.9;
    }
    .rating-stars-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .rating-stars {
      color: #fcd34d;
      font-size: 18px;
      letter-spacing: 2px;
    }
    .table-responsive {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      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;
      border-bottom: 1px solid #edf2f7;
      font-size: 14px;
    }
    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    .compare-table td.highlight {
      background: var(--primary-soft);
      font-weight: 700;
      color: var(--primary);
    }

    /* 评价卡片 */
    .testimonial-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-body {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
      font-style: normal;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }
    .user-avatar-badge {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-mint);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 14px;
    }
    .user-info-name {
      font-weight: 700;
      color: var(--text-main);
      font-size: 14px;
    }
    .user-info-role {
      font-size: 12px;
      color: var(--text-sub);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: none;
      border: none;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-icon {
      font-size: 18px;
      color: var(--primary);
      transition: transform 0.2s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #fafcfb;
    }
    .faq-answer-inner {
      padding: 16px 24px 22px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px solid #f0f4f2;
    }

    /* 表单与需求匹配 */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }
    .form-group-full {
      grid-column: 1 / -1;
    }
    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
      background-color: #fdfdfd;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.15);
      background-color: #ffffff;
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }
    .btn-submit {
      width: 100%;
      padding: 15px;
      background: linear-gradient(135deg, var(--primary), #047857);
      color: #ffffff;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 16px;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(5, 150, 105, 0.3);
      transition: var(--transition);
    }
    .btn-submit:hover {
      box-shadow: 0 6px 18px rgba(5, 150, 105, 0.4);
      transform: translateY(-1px);
    }

    /* 资讯与百科 */
    .article-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: var(--transition);
    }
    .article-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .article-date {
      font-size: 12px;
      color: var(--text-sub);
      margin-bottom: 8px;
    }
    .article-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .article-title:hover {
      color: var(--primary);
    }
    .article-snippet {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px 0;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand p {
      font-size: 13px;
      line-height: 1.7;
      margin: 16px 0;
      color: var(--text-sub);
    }
    .footer-heading {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 18px;
      position: relative;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      font-size: 13px;
      color: var(--text-muted);
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .footer-qr-wrap {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 10px;
    }
    .footer-qr-img {
      width: 110px;
      height: 110px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      padding: 4px;
      background: #fff;
    }
    .footer-qr-img img {
      width: 100%;
      height: 100%;
      display: block;
      object-fit: contain;
    }
    .footer-bottom {
      border-top: 1px solid #edf2f7;
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
      color: var(--text-sub);
    }
    .friend-links-box {
      margin-top: 24px;
      padding: 16px;
      background: #f8faf9;
      border-radius: var(--radius-sm);
      font-size: 13px;
    }
    .friend-links-box a {
      margin-right: 14px;
      color: var(--text-muted);
      display: inline-block;
      margin-bottom: 6px;
    }
    .friend-links-box a:hover {
      color: var(--primary);
    }

    /* 浮动客服 */
    .float-contact-btn {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 990;
      background: linear-gradient(135deg, var(--primary), #047857);
      color: #ffffff;
      width: 54px;
      height: 54px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 8px 24px rgba(5, 150, 105, 0.4);
      cursor: pointer;
      transition: var(--transition);
      font-size: 22px;
    }
    .float-contact-btn:hover {
      transform: scale(1.08);
    }
    .float-card {
      position: fixed;
      right: 24px;
      bottom: 96px;
      width: 250px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-lg);
      z-index: 991;
      display: none;
      text-align: center;
    }
    .float-card.active {
      display: block;
    }
    .float-card img {
      width: 140px;
      height: 140px;
      margin: 0 auto 10px auto;
      display: block;
      border-radius: 6px;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .grid-4col { grid-template-columns: repeat(2, 1fr); }
      .grid-3col { grid-template-columns: repeat(2, 1fr); }
      .steps-container { grid-template-columns: repeat(2, 1fr); }
      .feature-split { grid-template-columns: 1fr; gap: 30px; }
      .feature-split.reverse { direction: ltr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-stats-bar { grid-template-columns: repeat(2, 1fr); gap: 16px; }
      .stat-item { border-right: none; }
    }
    @media (max-width: 768px) {
      .nav-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show { display: flex; }
      .nav-item { width: 100%; }
      .nav-item a { width: 100%; padding: 10px 0; }
      .hero-title { font-size: 28px; }
      .hero-subtitle { font-size: 15px; }
      .section-title { font-size: 24px; }
      .grid-3col, .grid-4col, .steps-container { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .rating-banner { flex-direction: column; text-align: center; }
      .rating-info { flex-direction: column; }
    }