:root {
      --primary: #1e40af;
      --primary-light: #3b82f6;
      --accent: #f97316;
      --accent-alt: #06b6d4;
      --accent-warm: #ec4899;
      --bg-base: #f8fafc;
      --surface: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border: #e2e8f0;
      --radius: 12px;
      --shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --transition: all 0.25s ease-in-out;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background-color: var(--bg-base);
      color: var(--text-main);
      overflow-x: hidden;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--accent);
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid #e0e7ff;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-logo-wrap {
      max-width: 150px;
      display: flex;
      align-items: center;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      padding: 8px 12px;
      border-radius: 6px;
    }
    .nav-links li a:hover {
      color: var(--accent);
      background: #eff6ff;
    }
    .header-action {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 8px;
      font-size: 15px;
      font-weight: 700;
      border: 2px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
    }
    .btn-primary {
      background: linear-gradient(135deg, #1e40af, #2563eb);
      color: #ffffff !important;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #1d4ed8, #1e40af);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
    }
    .btn-accent {
      background: linear-gradient(135deg, #f97316, #ea580c);
      color: #ffffff !important;
      box-shadow: 0 4px 12px rgba(249, 115, 22, 0.25);
    }
    .btn-accent:hover {
      background: linear-gradient(135deg, #ea580c, #c2410c);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(249, 115, 22, 0.35);
    }
    .btn-outline {
      background: #ffffff;
      color: var(--primary) !important;
      border-color: var(--primary);
    }
    .btn-outline:hover {
      background: #eff6ff;
      border-color: var(--primary-light);
    }
    .mobile-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .mobile-toggle span {
      display: block;
      width: 24px;
      height: 3px;
      background-color: var(--text-main);
      border-radius: 2px;
    }

    /* 首屏无图 Hero - 明艳撞色风格 */
    .hero-section {
      background: radial-gradient(circle at 85% 15%, #ffedd5 0%, transparent 45%),
                  radial-gradient(circle at 10% 80%, #cffafe 0%, transparent 40%),
                  linear-gradient(180deg, #eff6ff 0%, #ffffff 100%);
      padding: 80px 0 64px 0;
      border-bottom: 1px solid #e2e8f0;
      position: relative;
    }
    .hero-wrap {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #fff7ed;
      border: 1px solid #fdba74;
      border-radius: 9999px;
      color: #c2410c;
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 900;
      color: #0f172a;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero-title span {
      color: #2563eb;
      position: relative;
    }
    .hero-title em {
      font-style: normal;
      color: #ea580c;
    }
    .hero-desc {
      font-size: 19px;
      color: #475569;
      max-width: 820px;
      line-height: 1.7;
      margin-bottom: 36px;
    }
    .hero-cta {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .hero-cta .btn {
      padding: 14px 34px;
      font-size: 16px;
    }
    .hero-highlight-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      width: 100%;
    }
    .hero-stat-card {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: var(--radius);
      padding: 20px 16px;
      text-align: center;
      transition: var(--transition);
      box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    }
    .hero-stat-card:hover {
      border-color: var(--primary-light);
      transform: translateY(-4px);
    }
    .hero-stat-card:nth-child(1) { border-top: 4px solid #2563eb; }
    .hero-stat-card:nth-child(2) { border-top: 4px solid #ea580c; }
    .hero-stat-card:nth-child(3) { border-top: 4px solid #0891b2; }
    .hero-stat-card:nth-child(4) { border-top: 4px solid #db2777; }

    .hero-stat-val {
      font-size: 26px;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .hero-stat-lbl {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* Section 通用规范 */
    .section {
      padding: 72px 0;
      border-bottom: 1px solid #edf2f7;
    }
    .section-alt {
      background-color: #f1f5f9;
    }
    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 52px auto;
    }
    .section-subtitle {
      font-size: 13px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: #ea580c;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: #0f172a;
      line-height: 1.35;
      margin-bottom: 12px;
    }
    .section-intro {
      font-size: 16px;
      color: #64748b;
    }

    /* 模型矩阵徽章墙 */
    .model-badge-wrap {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 24px;
      border: 2px solid #e2e8f0;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .model-chip {
      background: #f8fafc;
      border: 1px solid #cbd5e1;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 600;
      color: #1e293b;
      transition: var(--transition);
    }
    .model-chip:hover {
      background: #2563eb;
      color: #ffffff;
      border-color: #2563eb;
      transform: translateY(-2px);
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
      align-items: center;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .feature-card:hover {
      border-color: #f97316;
      box-shadow: 0 16px 30px -10px rgba(249, 115, 22, 0.12);
      transform: translateY(-5px);
    }
    .card-icon-title {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .tag-icon {
      width: 42px;
      height: 42px;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 18px;
      color: #ffffff;
    }
    .tag-blue { background: linear-gradient(135deg, #1d4ed8, #3b82f6); }
    .tag-orange { background: linear-gradient(135deg, #ea580c, #f97316); }
    .tag-cyan { background: linear-gradient(135deg, #0891b2, #06b6d4); }
    .tag-purple { background: linear-gradient(135deg, #7c3aed, #a855f7); }

    .feature-card h3 {
      font-size: 19px;
      font-weight: 700;
      color: #0f172a;
    }
    .feature-card p {
      font-size: 14px;
      color: #475569;
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 流程图卡片 */
    .step-card {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      background: #ea580c;
      color: #ffffff;
      font-weight: 900;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
    }
    .step-card h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-card p {
      font-size: 13.5px;
      color: #64748b;
    }

    /* 对比评测表格与评分板 */
    .eval-container {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      padding: 32px;
    }
    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, #eff6ff, #fff7ed);
      border: 2px solid #fdba74;
      border-radius: 8px;
      padding: 20px 28px;
      margin-bottom: 28px;
      flex-wrap: wrap;
      gap: 16px;
    }
    .rating-badge {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .rating-score {
      font-size: 40px;
      font-weight: 900;
      color: #ea580c;
      line-height: 1;
    }
    .rating-detail h4 {
      font-size: 18px;
      font-weight: 800;
      color: #0f172a;
    }
    .rating-detail p {
      font-size: 13px;
      color: #475569;
    }
    .rating-stars {
      color: #ea580c;
      font-size: 20px;
      letter-spacing: 2px;
    }
    .table-wrap {
      overflow-x: auto;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .compare-table th, .compare-table td {
      padding: 14px 18px;
      border-bottom: 1px solid #e2e8f0;
      font-size: 14px;
    }
    .compare-table th {
      background-color: #f8fafc;
      color: #1e293b;
      font-weight: 700;
    }
    .compare-table tr:hover td {
      background-color: #fafaf9;
    }
    .badge-check {
      display: inline-block;
      padding: 3px 8px;
      border-radius: 4px;
      font-weight: 700;
      font-size: 12px;
    }
    .check-yes {
      background: #dcfce7;
      color: #15803d;
    }
    .check-no {
      background: #fee2e2;
      color: #b91c1c;
    }

    /* 案例图片展示容器 */
    .media-box {
      border-radius: var(--radius);
      overflow: hidden;
      border: 2px solid #e2e8f0;
      background: #ffffff;
      box-shadow: var(--shadow);
    }
    .media-box img {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
    }
    .media-box:hover img {
      transform: scale(1.02);
    }
    .media-caption {
      padding: 16px;
      background: #ffffff;
      border-top: 1px solid #f1f5f9;
    }
    .media-caption h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 4px;
    }
    .media-caption p {
      font-size: 13px;
      color: #64748b;
    }

    /* 用户评论卡片 */
    .review-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-left: 4px solid #2563eb;
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-text {
      font-size: 14px;
      color: #334155;
      margin-bottom: 16px;
      line-height: 1.6;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #eff6ff;
      border: 1px solid #cbd5e1;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: #1e40af;
      font-size: 14px;
    }
    .author-info h5 {
      font-size: 14px;
      font-weight: 700;
      color: #0f172a;
    }
    .author-info span {
      font-size: 12px;
      color: #64748b;
    }

    /* FAQ 折叠手风琴 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      max-width: 920px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item.active {
      border-color: #2563eb;
    }
    .faq-question {
      padding: 18px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-size: 16px;
      font-weight: 700;
      color: #1e293b;
      background: #ffffff;
      user-select: none;
    }
    .faq-question:hover {
      background-color: #f8fafc;
    }
    .faq-icon {
      font-size: 18px;
      transition: transform 0.2s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #f8fafc;
      padding: 0 24px;
      color: #475569;
      font-size: 14.5px;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      padding: 16px 24px 20px 24px;
      max-height: 250px;
      border-top: 1px solid #edf2f7;
    }

    /* 表单与需求匹配 */
    .form-box {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 6px;
      color: #1e293b;
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      font-size: 14px;
      color: #0f172a;
      background: #f8fafc;
      outline: none;
      transition: var(--transition);
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: #2563eb;
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }
    .form-textarea {
      height: 110px;
      resize: vertical;
    }

    /* 文章列表与资讯 */
    .article-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius);
      padding: 20px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .article-card:hover {
      border-color: #2563eb;
      transform: translateY(-3px);
    }
    .article-card h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
      color: #0f172a;
    }
    .article-link-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 12px;
    }
    .article-link-chip {
      display: inline-block;
      background: #eff6ff;
      border: 1px solid #bfdbfe;
      color: #1d4ed8;
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 600;
    }

    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: #ffffff;
      border: 2px solid #ea580c;
      border-radius: 12px;
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
      padding: 12px;
      text-align: center;
      width: 140px;
    }
    .float-kefu-img-wrap {
      width: 100px;
      height: 100px;
      margin: 0 auto 6px auto;
      overflow: hidden;
      border-radius: 6px;
      border: 1px solid #cbd5e1;
    }
    .float-kefu-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }
    .float-kefu-text {
      font-size: 12px;
      font-weight: 800;
      color: #ea580c;
    }

    /* Footer */
    .footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 24px 0;
      border-top: 4px solid #ea580c;
    }
    .footer a {
      color: #cbd5e1;
    }
    .footer a:hover {
      color: #f97316;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      font-size: 14px;
    }
    .footer-links-inline {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 13.5px;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #64748b;
    }

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .hero-highlight-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .grid-3, .grid-2 { grid-template-columns: 1fr; }
      .hero-title { font-size: 30px; }
      .mobile-toggle { display: flex; }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 2px solid #e2e8f0;
        box-shadow: 0 10px 15px rgba(0,0,0,0.05);
      }
      .nav-links.show { display: flex; }
      .hero-highlight-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .float-kefu { display: none; }
    }