:root {
      --primary-red: #d32f2f;
      --primary-dark: #b71c1c;
      --primary-light: #ffebee;
      --accent-gold: #e65100;
      --accent-bright: #ff5252;
      --text-main: #212121;
      --text-muted: #5f6368;
      --text-sub: #757575;
      --bg-page: #faf8f8;
      --bg-card: #ffffff;
      --border-color: #f0d0d0;
      --shadow-sm: 0 4px 12px rgba(211, 47, 47, 0.06);
      --shadow-md: 0 8px 24px rgba(211, 47, 47, 0.12);
      --shadow-lg: 0 16px 36px rgba(183, 28, 28, 0.16);
      --container-width: 1200px;
      --radius: 12px;
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      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: 1.6;
    }
    body {
      background-color: var(--bg-page);
      color: var(--text-main);
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .site-container {
      width: 100%;
      max-width: var(--container-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .header-nav {
      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: var(--shadow-sm);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap .logo-img-box {
      max-width: 140px;
      display: flex;
      align-items: center;
    }
    .brand-text {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-red);
      letter-spacing: 0.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 12px;
      border-radius: 6px;
    }
    .nav-links li a:hover {
      color: var(--primary-red);
      background-color: var(--primary-light);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-left: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #e53935 0%, #c62828 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(229, 57, 53, 0.35);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #d32f2f 0%, #b71c1c 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(183, 28, 28, 0.45);
      color: #ffffff;
    }
    .btn-secondary {
      background: #ffffff;
      color: var(--primary-red);
      border-color: #ffcdd2;
    }
    .btn-secondary:hover {
      background: var(--primary-light);
      border-color: var(--primary-red);
    }
    .btn-lg {
      padding: 14px 32px;
      font-size: 16px;
      border-radius: 10px;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }
    .hero-section {
      position: relative;
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% 0%, #ffebee 0%, #faf8f8 70%);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #ffcdd2;
      border-radius: 50px;
      color: var(--primary-red);
      font-size: 13px;
      font-weight: 600;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 40px;
      line-height: 1.25;
      font-weight: 800;
      color: #1a1a1a;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      color: var(--primary-red);
      background: linear-gradient(135deg, #d32f2f, #b71c1c);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .stats-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }
    .stat-card {
      background: #ffffff;
      border: 1px solid #fce4ec;
      border-radius: var(--radius);
      padding: 24px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #ffcdd2;
    }
    .stat-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary-red);
      line-height: 1.1;
      margin-bottom: 6px;
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-sub);
      font-weight: 500;
    }
    .section-padding {
      padding: 80px 0;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary-red);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      background: var(--primary-light);
      padding: 4px 12px;
      border-radius: 4px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: #1a1a1a;
      margin-bottom: 14px;
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .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: 30px;
    }
    .card-base {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .card-base:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
      border-color: #ef9a9a;
    }
    .card-icon-wrap {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary-red);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: bold;
      margin-bottom: 18px;
    }
    .card-heading {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 12px;
      color: #111111;
    }
    .card-paragraph {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .model-tags-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 15px;
    }
    .model-chip {
      background: #fff5f5;
      color: #c62828;
      border: 1px solid #ffcdd2;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 600;
      transition: var(--transition);
    }
    .model-chip:hover {
      background: var(--primary-red);
      color: #ffffff;
      border-color: var(--primary-red);
    }
    .media-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      background: #ffffff;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .media-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .media-card-img-wrap {
      width: 100%;
      background: #f5f5f5;
      overflow: hidden;
      aspect-ratio: 16 / 9;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .media-card-img-wrap.square {
      aspect-ratio: 1 / 1;
    }
    .media-card-body {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .media-card-title {
      font-size: 17px;
      font-weight: 700;
      color: #212121;
      margin-bottom: 8px;
    }
    .media-card-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .table-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }
    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #fce4ec;
    }
    .custom-table th {
      background: #ffebee;
      color: var(--primary-dark);
      font-weight: 700;
      white-space: nowrap;
    }
    .custom-table tr:hover {
      background: #fffcfc;
    }
    .badge-score {
      display: inline-block;
      padding: 4px 8px;
      border-radius: 4px;
      font-weight: 700;
      font-size: 12px;
      background: #e8f5e9;
      color: #2e7d32;
    }
    .score-highlight {
      background: #d32f2f;
      color: #ffffff;
      padding: 6px 12px;
      border-radius: 6px;
      font-weight: 800;
      font-size: 14px;
      display: inline-block;
    }
    .step-list {
      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);
      padding: 24px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .step-number {
      font-size: 28px;
      font-weight: 900;
      color: #ffcdd2;
      line-height: 1;
      margin-bottom: 12px;
    }
    .step-title {
      font-size: 17px;
      font-weight: 700;
      color: #1a1a1a;
      margin-bottom: 8px;
    }
    .step-text {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .faq-accordion {
      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);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .faq-header {
      padding: 18px 24px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
      font-weight: 600;
      font-size: 16px;
      color: var(--text-main);
      background: #ffffff;
      transition: background 0.2s;
    }
    .faq-header:hover {
      background: #fff8f8;
      color: var(--primary-red);
    }
    .faq-toggle-icon {
      font-size: 18px;
      color: var(--primary-red);
      font-weight: bold;
      transition: transform 0.3s;
    }
    .faq-content {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out, padding 0.3s ease;
      background: #ffffff;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .faq-item.active .faq-content {
      padding: 0 24px 20px;
      max-height: 200px;
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }
    .review-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;
    }
    .review-stars {
      color: #ff9800;
      font-size: 16px;
      margin-bottom: 12px;
    }
    .review-body {
      font-size: 14px;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 16px;
      font-style: italic;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 10px;
      border-top: 1px dashed #fce4ec;
      padding-top: 12px;
    }
    .author-avatar {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-red);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 14px;
    }
    .author-info h4 {
      font-size: 14px;
      color: #1a1a1a;
      font-weight: 700;
    }
    .author-info p {
      font-size: 12px;
      color: var(--text-sub);
    }
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .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 #dcdcdc;
      border-radius: 8px;
      font-size: 14px;
      color: var(--text-main);
      background: #fafafa;
      transition: var(--transition);
      font-family: inherit;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary-red);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(211, 47, 47, 0.1);
    }
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
    }
    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 16px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .article-item:hover {
      border-color: var(--primary-red);
      transform: translateY(-2px);
    }
    .article-link {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      display: block;
      margin-bottom: 8px;
      word-break: break-all;
    }
    .article-link:hover {
      color: var(--primary-red);
    }
    .article-tag {
      font-size: 12px;
      color: var(--primary-red);
      background: var(--primary-light);
      padding: 2px 8px;
      border-radius: 4px;
      align-self: flex-start;
    }
    .site-footer {
      background: #212121;
      color: #e0e0e0;
      padding: 60px 0 30px;
      border-top: 4px solid var(--primary-red);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      font-size: 16px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 18px;
      border-left: 3px solid var(--primary-red);
      padding-left: 10px;
    }
    .footer-col p {
      font-size: 13px;
      color: #b0b0b0;
      line-height: 1.6;
      margin-bottom: 12px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-links a {
      font-size: 13px;
      color: #b0b0b0;
    }
    .footer-links a:hover {
      color: #ffffff;
      padding-left: 4px;
    }
    .friend-links-box {
      border-top: 1px solid #333333;
      padding-top: 24px;
      margin-bottom: 24px;
    }
    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
    }
    .friend-links-list a {
      color: #9e9e9e;
    }
    .friend-links-list a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid #333333;
      padding-top: 20px;
      text-align: center;
      font-size: 12px;
      color: #757575;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 10px;
    }
    .qr-container {
      display: inline-block;
      padding: 6px;
      background: #ffffff;
      border-radius: 6px;
      max-width: 110px;
      margin-top: 8px;
    }
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 80px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary-red);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(0,0,0,0.2);
      cursor: pointer;
      transition: var(--transition);
      font-size: 18px;
      border: none;
    }
    .float-btn:hover {
      transform: scale(1.1);
      background: var(--primary-dark);
    }
    .float-qr-panel {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      width: 140px;
      text-align: center;
    }
    .float-qr-panel p {
      font-size: 11px;
      color: var(--text-main);
      margin-top: 6px;
      font-weight: 600;
    }
    .float-btn-wrap:hover .float-qr-panel {
      display: block;
    }
    @media (max-width: 992px) {
      .grid-4, .step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        flex-direction: column;
        box-shadow: var(--shadow-md);
      }
      .nav-menu.show {
        display: flex;
      }
      .nav-links {
        flex-direction: column;
        width: 100%;
        gap: 8px;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-actions {
        margin-left: 0;
        margin-top: 14px;
        width: 100%;
        justify-content: center;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 28px;
      }
      .stats-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-4, .grid-2, .step-list {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }