:root {
      --primary: #d9232e;
      --primary-dark: #b31620;
      --primary-light: #fff1f0;
      --primary-accent: #ff4d4f;
      --secondary: #ff7875;
      --text-main: #1f2937;
      --text-muted: #4b5563;
      --text-light: #6b7280;
      --bg-page: #fcf8f8;
      --bg-card: #ffffff;
      --border-color: #f3d1d3;
      --border-focus: #d9232e;
      --shadow-sm: 0 2px 8px rgba(217, 35, 46, 0.06);
      --shadow-md: 0 8px 24px rgba(217, 35, 46, 0.1);
      --shadow-lg: 0 16px 36px rgba(217, 35, 46, 0.14);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --container-width: 1200px;
      --transition: all 0.28s ease;
    }

    * {
      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, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

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

    ul, ol {
      list-style: none;
    }

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

    .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, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

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

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

    .brand-logo-wrap {
      max-height: 46px;
      display: flex;
      align-items: center;
    }

    .brand-name {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-link-item {
      display: inline-block;
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
      white-space: nowrap;
    }

    .nav-link-item:hover, .nav-link-item.active {
      color: var(--primary);
      background: var(--primary-light);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
      line-height: 1.2;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(217, 35, 46, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(217, 35, 46, 0.45);
      color: #ffffff;
    }

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

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

    .btn-lg {
      padding: 14px 32px;
      font-size: 1.1rem;
      border-radius: var(--radius-md);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    /* 区域通用标题 */
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }

    .section-bg-alt {
      background-color: #fff9f9;
      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;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: var(--primary-light);
      border: 1px solid var(--border-color);
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 700;
      border-radius: 30px;
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: #111827;
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 首屏 HERO - 严禁图片纯CSS构建科技热烈感 */
    .hero-section {
      padding: 70px 0 85px;
      background: linear-gradient(180deg, #ffffff 0%, #fff2f2 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }

    .hero-decor-circle {
      position: absolute;
      width: 460px;
      height: 460px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(217, 35, 46, 0.08) 0%, rgba(217, 35, 46, 0) 70%);
      top: -100px;
      right: -100px;
      pointer-events: none;
    }

    .hero-decor-square {
      position: absolute;
      width: 320px;
      height: 320px;
      background: radial-gradient(circle, rgba(255, 120, 117, 0.09) 0%, rgba(255, 255, 255, 0) 70%);
      bottom: -60px;
      left: -80px;
      pointer-events: none;
    }

    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .hero-badge-hot {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 18px;
      background: #ffe3e3;
      border: 1px solid #ffa39e;
      color: var(--primary-dark);
      font-size: 0.9rem;
      font-weight: 700;
      border-radius: 30px;
      margin-bottom: 24px;
      animation: pulseGlow 2.4s infinite;
    }

    @keyframes pulseGlow {
      0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(217,35,46,0.3); }
      50% { transform: scale(1.02); box-shadow: 0 0 16px 4px rgba(217,35,46,0.15); }
    }

    .hero-main-title {
      font-size: 2.75rem;
      font-weight: 900;
      color: #111827;
      line-height: 1.25;
      margin-bottom: 22px;
      letter-spacing: -0.5px;
    }

    .hero-main-title .highlight {
      color: var(--primary);
      position: relative;
      display: inline-block;
    }

    .hero-sub-text {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.8;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-btn-group {
      display: flex;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }

    .hero-features-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .hero-feature-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      text-align: center;
    }

    .hero-feature-pill .pill-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 4px;
    }

    .hero-feature-pill .pill-sub {
      font-size: 0.82rem;
      color: var(--text-light);
    }

    /* 数据指标板块 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .metric-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 28px 20px;
      text-align: center;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .metric-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-accent);
    }

    .metric-num {
      font-size: 2.3rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
    }

    .metric-label {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .metric-tip {
      font-size: 0.82rem;
      color: var(--text-light);
    }

    /* 卡片网格通用 */
    .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: 28px;
    }

    .info-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 26px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

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

    .card-tag {
      align-self: flex-start;
      padding: 3px 10px;
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-light);
      border-radius: 4px;
      margin-bottom: 14px;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: #111827;
      margin-bottom: 10px;
      line-height: 1.4;
    }

    .card-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }

    /* 模型矩阵徽章墙 */
    .model-tags-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }

    .model-tags-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 18px;
      text-align: center;
    }

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

    .model-pill {
      padding: 7px 16px;
      background: #fff5f5;
      color: #b31620;
      border: 1px solid #ffd8d8;
      border-radius: 20px;
      font-size: 0.88rem;
      font-weight: 600;
      transition: var(--transition);
    }

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

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

    .step-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 28px 20px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      position: relative;
      text-align: center;
    }

    .step-number {
      width: 44px;
      height: 44px;
      line-height: 44px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: #ffffff;
      font-weight: 800;
      font-size: 1.15rem;
      border-radius: 50%;
      margin: 0 auto 16px;
      box-shadow: 0 4px 10px rgba(217,35,46,0.3);
    }

    /* 对比评测表格与评分卡 */
    .review-score-banner {
      background: linear-gradient(135deg, #fff2f2 0%, #ffe6e6 100%);
      border: 2px solid var(--primary-accent);
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-left h3 {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 6px;
    }

    .score-left p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    .score-badge-box {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }

    .score-stars {
      color: #ff9900;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }

    .score-digits {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .score-digits span {
      font-size: 1.1rem;
      color: var(--text-light);
      font-weight: 600;
    }

    .table-container {
      width: 100%;
      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;
      font-size: 0.92rem;
      min-width: 650px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f0f0f0;
    }

    .compare-table th {
      background: #fff5f5;
      color: var(--text-main);
      font-weight: 700;
    }

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

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

    /* 案例展示 */
    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .media-img-wrap {
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #f0f0f0;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

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

    .media-card:hover .media-img-wrap img {
      transform: scale(1.04);
    }

    .media-body {
      padding: 20px;
    }

    /* 用户评论 */
    .comment-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;
    }

    .comment-quote {
      font-size: 0.92rem;
      color: var(--text-main);
      line-height: 1.7;
      margin-bottom: 18px;
      position: relative;
    }

    .comment-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f8e5e6;
      padding-top: 14px;
    }

    .comment-avatar-char {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #ffe3e3;
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .user-meta-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: #111827;
    }

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

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 880px;
      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: var(--transition);
    }

    .faq-question {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.02rem;
      color: #111827;
      user-select: none;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      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, padding 0.3s ease;
      background: #fffcfc;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.93rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 250px;
      padding: 16px 24px 22px;
      border-top: 1px solid #fce8e9;
    }

    /* 表单与联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1.3fr;
      gap: 36px;
      align-items: start;
    }

    .contact-info-panel {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .contact-info-title {
      font-size: 1.4rem;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 20px;
    }

    .contact-detail-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-bottom: 26px;
    }

    .contact-detail-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .contact-detail-label {
      font-weight: 700;
      color: var(--primary);
      min-width: 80px;
    }

    .qr-block {
      text-align: center;
      background: #fff5f5;
      padding: 18px;
      border-radius: var(--radius-md);
      border: 1px dashed #ffa39e;
    }

    .qr-block-img-wrap {
      max-width: 140px;
      margin: 0 auto 10px;
      background: #ffffff;
      padding: 6px;
      border-radius: 8px;
    }

    .form-panel {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

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

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #d1d5db;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background: #ffffff;
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--border-focus);
      box-shadow: 0 0 0 3px rgba(217, 35, 46, 0.12);
    }

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

    /* 行业资讯 & 友情链接 */
    .article-links-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 18px;
    }

    .article-link-tag {
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.88rem;
      color: var(--text-main);
      transition: var(--transition);
    }

    .article-link-tag:hover {
      background: var(--primary-light);
      border-color: var(--primary);
      color: var(--primary);
    }

    /* 页脚统一深灰底色 + 浅白文字安全对比 */
    .site-footer {
      background: #18191c;
      color: #e5e7eb;
      padding: 60px 0 30px;
      border-top: 4px solid var(--primary);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 45px;
    }

    .footer-col-title {
      color: #ffffff;
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 18px;
      position: relative;
      padding-bottom: 8px;
    }

    .footer-col-title::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 28px;
      height: 2px;
      background: var(--primary);
    }

    .footer-links-list {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links-list a {
      color: #9ca3af;
      font-size: 0.9rem;
    }

    .footer-links-list a:hover {
      color: #ffffff;
      padding-left: 4px;
    }

    .friend-links-box {
      border-top: 1px solid #2d3036;
      padding-top: 24px;
      margin-bottom: 30px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
    }

    .friend-links-label {
      color: #9ca3af;
      font-size: 0.88rem;
      font-weight: 600;
    }

    .friend-links-box a {
      color: #d1d5db;
      font-size: 0.88rem;
      padding: 4px 10px;
      background: #23252a;
      border-radius: 4px;
    }

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

    .footer-bottom {
      text-align: center;
      border-top: 1px solid #282a30;
      padding-top: 24px;
      font-size: 0.85rem;
      color: #6b7280;
    }

    /* 浮动工具栏 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      color: var(--primary);
      font-weight: 700;
      font-size: 1.1rem;
      transition: var(--transition);
    }

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

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .hero-main-title { font-size: 2.2rem; }
      .cards-grid-4, .hero-features-bar, .step-grid { grid-template-columns: repeat(2, 1fr); }
      .cards-grid-3 { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .site-header { position: static; }
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 2px solid var(--primary);
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      }
      .nav-links.show { display: flex; }
      .nav-link-item { width: 100%; padding: 10px 14px; text-align: left; }
      .header-actions { display: none; }
      .hero-main-title { font-size: 1.85rem; }
      .hero-sub-text { font-size: 1rem; }
      .hero-features-bar, .step-grid, .cards-grid-2, .cards-grid-3, .cards-grid-4, .metrics-grid { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .section-title { font-size: 1.65rem; }
      .review-score-banner { flex-direction: column; text-align: center; }
      .score-badge-box { justify-content: center; }
    }