:root {
      --primary: #2563eb;
      --primary-light: #3b82f6;
      --primary-gradient: linear-gradient(135deg, #1d4ed8 0%, #3b82f6 50%, #06b6d4 100%);
      --accent: #0ea5e9;
      --accent-warm: #f59e0b;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-sub: #64748b;
      --border-color: #e2e8f0;
      --border-focus: #93c5fd;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 4px 20px -2px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 12px 30px -4px rgba(15, 23, 42, 0.12);
      --shadow-glow: 0 0 25px rgba(37, 99, 235, 0.18);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --container-width: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    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(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: var(--container-width);
      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, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .brand-group {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .brand-group .logo-box {
      width: 42px;
      height: 42px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .brand-badge {
      font-size: 0.75rem;
      background: #eff6ff;
      color: var(--primary);
      padding: 2px 8px;
      border-radius: var(--radius-full);
      font-weight: 600;
      border: 1px solid #bfdbfe;
    }

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

    .nav-links li a {
      display: block;
      padding: 8px 12px;
      font-size: 0.92rem;
      color: var(--text-muted);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s, background-color 0.2s;
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      color: var(--primary);
      background-color: #eff6ff;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      text-decoration: none;
      border-radius: var(--radius-sm);
      transition: all 0.25s ease;
      cursor: pointer;
      border: 1px solid transparent;
      white-space: nowrap;
      padding: 10px 20px;
      font-size: 0.95rem;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
      border-color: var(--border-color);
    }

    .btn-outline:hover {
      background: var(--bg-alt);
      border-color: #cbd5e1;
      color: var(--primary);
    }

    .btn-lg {
      padding: 14px 30px;
      font-size: 1.05rem;
      border-radius: var(--radius-md);
    }

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

    .mobile-menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: 0.3s;
    }

    /* 模块通用排版 */
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }

    .section-wrap.alt-bg {
      background-color: var(--bg-alt);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      background: #e0f2fe;
      padding: 4px 14px;
      border-radius: var(--radius-full);
      margin-bottom: 14px;
      border: 1px solid #bae6fd;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 1.02rem;
      color: var(--text-muted);
    }

    /* 首屏 HERO - 纯CSS亮丽风格，无图片 */
    .hero-section {
      padding: 90px 0 70px 0;
      background: radial-gradient(circle at 50% 10%, #eff6ff 0%, #ffffff 70%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }

    .hero-section::before {
      content: "";
      position: absolute;
      top: -100px;
      left: 50%;
      transform: translateX(-50%);
      width: 650px;
      height: 350px;
      background: linear-gradient(135deg, rgba(37, 99, 235, 0.15), rgba(6, 182, 212, 0.15));
      filter: blur(80px);
      border-radius: 50%;
      pointer-events: none;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 1;
    }

    .hero-badge-wrap {
      margin-bottom: 24px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid #bfdbfe;
      padding: 6px 18px;
      border-radius: var(--radius-full);
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
    }

    .hero-badge .dot {
      width: 8px;
      height: 8px;
      background-color: #10b981;
      border-radius: 50%;
      box-shadow: 0 0 8px #10b981;
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.22;
      color: var(--text-main);
      margin-bottom: 22px;
      letter-spacing: -1px;
    }

    .hero-title-highlight {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-subtitle {
      font-size: 1.18rem;
      color: var(--text-muted);
      max-width: 740px;
      margin: 0 auto 36px auto;
      line-height: 1.6;
    }

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

    .hero-chips-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
      max-width: 840px;
      margin: 0 auto;
    }

    .hero-chip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 5px 12px;
      border-radius: var(--radius-full);
      font-size: 0.82rem;
      color: var(--text-sub);
      font-weight: 500;
      box-shadow: var(--shadow-sm);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 50px;
    }

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease;
    }

    .stat-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .stat-card .stat-val {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-card .stat-label {
      font-size: 0.85rem;
      color: var(--text-sub);
      font-weight: 500;
    }

    /* 网格卡片与容器 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

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

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-card:hover {
      border-color: var(--border-focus);
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .feature-card .card-icon {
      width: 46px;
      height: 46px;
      background: #eff6ff;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      color: var(--primary);
      margin-bottom: 16px;
      font-weight: bold;
    }

    .feature-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 平台模型矩阵一览标签云 */
    .model-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: var(--radius-full);
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s;
    }

    .model-pill:hover {
      background: #eff6ff;
      border-color: var(--primary-light);
      color: var(--primary);
    }

    /* 图文与素材展示卡片 */
    .media-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
    }

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

    .media-card .img-box {
      width: 100%;
      background: #e2e8f0;
      overflow: hidden;
      aspect-ratio: 16 / 9;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .media-card .img-box.square {
      aspect-ratio: 1 / 1;
    }

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

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

    .media-card .card-body {
      padding: 20px;
    }

    .media-card .card-body h4 {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .media-card .card-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 评测与对比表格 */
    .compare-card-main {
      background: #ffffff;
      border: 2px solid #bfdbfe;
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-glow);
      margin-bottom: 40px;
    }

    .rating-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 24px;
      margin-bottom: 28px;
    }

    .rating-score-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .rating-num {
      font-size: 3.2rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .rating-meta h3 {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.94rem;
    }

    .compare-table th, .compare-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-color);
    }

    .compare-table th {
      background-color: var(--bg-alt);
      font-weight: 700;
      color: var(--text-main);
    }

    .compare-table td.highlight {
      font-weight: 700;
      color: var(--primary);
      background-color: #f0f9ff;
    }

    /* 步骤流程 */
    .step-grid {
      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-md);
      padding: 24px 20px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      font-size: 0.95rem;
    }

    .step-item h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .step-item p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 折叠 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: var(--radius-md);
      overflow: hidden;
      transition: border-color 0.2s;
    }

    .faq-item.active {
      border-color: var(--primary-light);
      box-shadow: var(--shadow-sm);
    }

    .faq-header {
      padding: 18px 22px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 700;
      font-size: 1rem;
      color: var(--text-main);
      user-select: none;
    }

    .faq-header:hover {
      color: var(--primary);
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
      color: var(--text-sub);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--primary);
    }

    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 22px;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.65;
    }

    .faq-item.active .faq-body {
      max-height: 300px;
      padding: 0 22px 18px 22px;
    }

    /* 用户评论 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-body {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .user-avatar-badge {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #eff6ff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 1rem;
      border: 1px solid #bfdbfe;
    }

    .user-meta .user-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-meta .user-role {
      font-size: 0.8rem;
      color: var(--text-sub);
    }

    /* 表单与联系区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }

    .contact-info-panel {
      background: linear-gradient(145deg, #1e3a8a 0%, #1e40af 50%, #2563eb 100%);
      color: #ffffff;
      padding: 40px 32px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-info-panel h3 {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 12px;
      color: #ffffff;
    }

    .contact-info-panel p {
      font-size: 0.92rem;
      color: #e0e7ff;
      line-height: 1.6;
      margin-bottom: 24px;
    }

    .contact-items {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.92rem;
      color: #ffffff;
    }

    .contact-item strong {
      color: #93c5fd;
    }

    .qr-box-inner {
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
      margin-top: 16px;
      width: 140px;
    }

    .qr-box-inner img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 4px;
    }

    .form-panel {
      padding: 40px 32px;
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 11px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s, box-shadow 0.2s;
      background: #ffffff;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* 文章与外链条目 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .article-item:hover {
      border-color: var(--primary-light);
      transform: translateY(-2px);
    }

    .article-item a {
      text-decoration: none;
      color: var(--text-main);
      font-weight: 700;
      font-size: 0.98rem;
      display: block;
      margin-bottom: 8px;
    }

    .article-item a:hover {
      color: var(--primary);
    }

    .article-item .article-date {
      font-size: 0.8rem;
      color: var(--text-sub);
    }

    /* 底部通用规范 */
    .site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 25px 0;
      color: var(--text-muted);
    }

    .footer-top-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      padding-bottom: 36px;
      border-bottom: 1px solid var(--border-color);
    }

    .footer-col h5 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links a {
      text-decoration: none;
      color: var(--text-muted);
      font-size: 0.88rem;
      transition: color 0.2s;
    }

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

    .friend-links-box {
      margin-top: 24px;
      padding-top: 20px;
      border-top: 1px dashed var(--border-color);
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 12px;
      font-size: 0.85rem;
    }

    .friend-links-box span {
      font-weight: 600;
      color: var(--text-main);
    }

    .friend-links-box a {
      color: var(--text-sub);
      text-decoration: none;
      transition: color 0.2s;
    }

    .friend-links-box a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      padding-top: 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 0.82rem;
      color: var(--text-sub);
      flex-wrap: wrap;
      gap: 12px;
    }

    /* 悬浮工具组件 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 990;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .tool-btn {
      width: 46px;
      height: 46px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 50%;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--text-main);
      text-decoration: none;
      transition: all 0.2s ease;
      position: relative;
    }

    .tool-btn:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    .tool-btn .qr-popup {
      position: absolute;
      right: 56px;
      bottom: 0;
      background: #ffffff;
      padding: 10px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      width: 140px;
      display: none;
    }

    .tool-btn:hover .qr-popup {
      display: block;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .grid-3, .step-grid, .articles-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4, .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-top-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-title {
        font-size: 2.3rem;
      }
    }

    @media (max-width: 768px) {
      .nav-links, .nav-actions {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .mobile-nav-panel {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 20px;
        box-shadow: var(--shadow-lg);
      }
      .mobile-nav-panel.show {
        display: block;
      }
      .mobile-nav-panel .nav-links {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
      }
      .mobile-nav-panel .nav-links li a {
        width: 100%;
        padding: 10px 0;
      }
      .grid-3, .grid-2, .grid-4, .step-grid, .articles-grid, .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-subtitle {
        font-size: 1rem;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
      .rating-header {
        flex-direction: column;
        align-items: flex-start;
      }
      .section-title {
        font-size: 1.7rem;
      }
    }