:root {
      --primary: #2A5CAA;
      --primary-light: #4A7CC8;
      --primary-dark: #1E4A89;
      --secondary: #F5F7FA;
      --accent: #FF6B35;
      --text: #2B2B2B;
      --text-light: #5A6472;
      --border: #E4E8EF;
      --shadow-sm: 0 2px 10px rgba(16, 32, 64, 0.05);
      --shadow: 0 6px 24px rgba(16, 32, 64, 0.08);
      --shadow-lg: 0 14px 40px rgba(16, 32, 64, 0.12);
      --radius: 12px;
      --radius-sm: 8px;
      --transition: all 0.3s cubic-bezier(.25,.8,.25,1);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: 'Roboto', sans-serif;
      line-height: 1.65;
      color: var(--text);
      background: #fff;
      -webkit-font-smoothing: antialiased;
    }
    .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

    /* ------- Section Titles ------- */
    .section-title {
      font-family: 'Montserrat', sans-serif;
      font-size: 2rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 56px;
      color: var(--primary);
      position: relative;
      letter-spacing: -0.4px;
    }
    .section-title:after {
      content: '';
      display: block;
      width: 64px;
      height: 4px;
      border-radius: 2px;
      background: var(--accent);
      margin: 18px auto 0;
    }

    /* ------- Hero ------- */
    .hero-section {
      padding: 96px 0;
      background: linear-gradient(135deg, var(--secondary) 0%, #fff 100%);
    }
    .hero-content {
      display: grid;
      grid-template-columns: 1.05fr 0.95fr;
      gap: 56px;
      align-items: center;
    }
    .hero-text { padding-right: 20px; }
    .hero-title {
      font-family: 'Montserrat', sans-serif;
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 24px;
      line-height: 1.2;
      letter-spacing: -0.6px;
    }
    .hero-description {
      font-size: 1.05rem;
      color: var(--text-light);
      margin-bottom: 32px;
    }
    .hero-image {
      border-radius: var(--radius);
      box-shadow: var(--shadow-lg);
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* ------- Features ------- */
    .feature-section { padding: 80px 0; }
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 28px;
    }
    .feature-card {
      background: #fff;
      padding: 32px 28px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid var(--border);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      border-color: transparent;
    }
    .feature-card h3 {
      color: var(--primary);
      margin-bottom: 14px;
      font-size: 1.15rem;
      font-family: 'Montserrat', sans-serif;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .feature-card h3 i {
      color: var(--accent);
      font-size: 1.25rem;
      width: 36px; height: 36px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: rgba(255,107,53,.1);
      border-radius: 10px;
      flex-shrink: 0;
    }
    .feature-card p { color: var(--text-light); font-size: .95rem; }

    /* ------- Update Module ------- */
    .update-module {
      padding: 80px 0;
      background: #fff;
    }
    .update-module .section-header { text-align: center; margin-bottom: 56px; }
    .update-module .section-header h2 {
      font-family: 'Montserrat', sans-serif;
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
      display: inline-block;
      position: relative;
      letter-spacing: -0.4px;
    }
    .update-module .section-header h2::after {
      content: '';
      display: block;
      width: 64px;
      height: 4px;
      background: var(--accent);
      margin: 18px auto 0;
      border-radius: 2px;
    }
    .update-module .section-header p {
      font-size: 1.08rem;
      color: var(--text-light);
      max-width: 640px;
      margin: 18px auto 0;
    }

    /* 三列更新卡片 */
    .update-module .methods-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 28px;
      max-width: 1200px;
      margin: 0 auto;
      align-items: stretch;
    }
    .update-module .method-card {
      background: #fff;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      overflow: hidden;
      transition: var(--transition);
      border: 1px solid var(--border);
      display: flex;
      flex-direction: column;
    }
    .update-module .method-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-lg);
      border-color: transparent;
    }
    .update-module .card-header {
      padding: 28px 20px 20px;
      color: #fff;
      text-align: center;
      position: relative;
    }
    .update-module .card-header h3 {
      font-family: 'Montserrat', sans-serif;
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
    }
    .update-module .card-header p { font-size: .9rem; opacity: .92; margin: 0; }
    .update-module .card-step {
      position: absolute;
      top: 12px;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(255,255,255,.25);
      color: #fff;
      font-size: .7rem;
      font-weight: 600;
      padding: 2px 14px;
      border-radius: 20px;
      letter-spacing: .5px;
      text-transform: uppercase;
    }

    /* 卡片头部颜色 */
    .update-module .method-card.sd .card-header { background: linear-gradient(135deg, #1e7e34, #27ae60); }
    .update-module .method-card.wifi-web .card-header { background: linear-gradient(135deg, #d35400, #e67e22); }
    .update-module .method-card.wifi-pc .card-header { background: linear-gradient(135deg, #1f6f9b, #3498db); }

    .update-module .card-body {
      padding: 24px 22px 28px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    /* 媒体区域统一高度 */
    .update-module .media-frame {
      min-height: 180px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
    }
    .update-module .media-frame .video-wrapper {
      position: relative;
      padding-bottom: 56.25%;
      height: 0;
      border-radius: var(--radius-sm);
      overflow: hidden;
      margin-bottom: 0;
      background: #f0f2f6;
      width: 100%;
    }
    .update-module .media-frame .video-wrapper iframe {
      position: absolute;
      top: 0; left: 0;
      width: 100%; height: 100%;
      border: none;
    }

    .update-module .qr-box {
      display: flex;
      flex-direction: column;
      align-items: center;
      margin: 0;
    }
    .update-module .qr-box img {
      width: 100%;
      max-width: 120px;
      height: auto;
      border-radius: 6px;
      border: 2px solid #fff;
      box-shadow: 0 2px 8px rgba(0,0,0,.08);
      background: #fff;
      padding: 4px;
    }
    .update-module .qr-box .qr-label {
      font-size: .7rem;
      color: var(--text-light);
      margin-top: 6px;
      text-align: center;
    }

    .update-module .card-desc {
      font-size: .92rem;
      color: var(--text-light);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    /* 步骤列表 */
    .update-module .step-list {
      list-style: none;
      counter-reset: step;
      padding: 0;
      margin: 0 0 20px;
    }
    .update-module .step-list li {
      position: relative;
      padding-left: 36px;
      margin-bottom: 10px;
      font-size: .9rem;
      color: var(--text-light);
      line-height: 1.5;
    }
    .update-module .step-list li::before {
      counter-increment: step;
      content: counter(step);
      position: absolute;
      left: 0;
      top: 2px;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: var(--secondary);
      color: var(--primary);
      font-size: .75rem;
      font-weight: 600;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* 按钮 */
    .update-module .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 11px 22px;
      border-radius: 30px;
      font-weight: 500;
      font-size: .88rem;
      text-decoration: none;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      background: var(--primary);
      color: #fff;
      margin-top: auto;
      width: 100%;
      max-width: 220px;
      align-self: center;
    }
    .update-module .btn:hover {
      transform: translateY(-2px);
    }

    .update-module .method-card.sd .btn { background: #27ae60; }
    .update-module .method-card.sd .btn:hover { background: #1e7e34; box-shadow: 0 8px 20px rgba(39,174,96,.28); }
    .update-module .method-card.wifi-web .btn { background: #e67e22; }
    .update-module .method-card.wifi-web .btn:hover { background: #d35400; box-shadow: 0 8px 20px rgba(230,126,34,.28); }
    .update-module .method-card.wifi-pc .btn { background: #3498db; }
    .update-module .method-card.wifi-pc .btn:hover { background: #1f6f9b; box-shadow: 0 8px 20px rgba(52,152,219,.3); }

    /* 底部提示条 */
    .update-module .methods-note {
      max-width: 900px;
      margin: 48px auto 0;
      padding: 18px 24px;
      background: #fff;
      border-radius: var(--radius-sm);
      border-left: 4px solid var(--accent);
      box-shadow: var(--shadow-sm);
      font-size: .95rem;
      color: var(--text-light);
      display: flex;
      align-items: flex-start;
      gap: 12px;
    }
    .update-module .methods-note i {
      color: var(--accent);
      font-size: 1.2rem;
      margin-top: 2px;
    }
    .update-module .methods-note strong { color: var(--text); }

    /* ------- Specs ------- */
    .specs-section { background: var(--secondary); padding: 80px 0; }
    .specs-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 4px 40px;
      background: #fff;
      padding: 36px 40px;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
    }
    .spec-item {
      display: flex;
      justify-content: space-between;
      padding: 16px 0;
      border-bottom: 1px solid var(--border);
      gap: 12px;
      font-size: .95rem;
    }
    .spec-label { font-weight: 500; color: var(--primary); flex-shrink: 0; }
    .spec-item span:last-child { text-align: right; color: var(--text-light); }

    /* ------- Drawing ------- */
    .drawing-section { padding: 80px 0; }
    .drawing-section img {
      max-width: 100%;
      height: auto;
      display: block;
      margin: 0 auto;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
    }

    /* ------- Driver Match ------- */
    .driver-match-module { padding: 80px 0; background: #F8FAFC; }
    .driver-match-module .section-header { text-align: center; margin-bottom: 56px; }
    .driver-match-module .section-header h2 {
      font-family: 'Montserrat', sans-serif;
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
      display: inline-block;
      position: relative;
      letter-spacing: -0.4px;
    }
    .driver-match-module .section-header h2::after {
      content: '';
      display: block;
      width: 64px;
      height: 4px;
      background: var(--accent);
      margin: 18px auto 0;
      border-radius: 2px;
    }
    .driver-match-module .driver-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
      align-items: stretch;
    }
    .driver-match-module .driver-card {
      background: #fff;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      overflow: hidden;
      transition: var(--transition);
      border: 1px solid var(--border);
      display: flex;
      flex-direction: column;
    }
    .driver-match-module .driver-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-lg);
      border-color: var(--primary-light);
    }
    .driver-match-module .card-image {
      background: #fff;
      padding: 32px 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 220px;
      border-bottom: 1px solid var(--border);
    }
    .driver-match-module .card-image img {
      max-width: 100%;
      max-height: 220px;
      width: auto;
      height: auto;
      object-fit: contain;
      display: block;
    }
    .driver-match-module .card-content {
      padding: 28px 30px 32px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .driver-match-module .card-content h3 {
      font-family: 'Montserrat', sans-serif;
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--primary);
      margin: 0 0 18px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .driver-match-module .card-content h3 .badge {
      font-size: .7rem;
      background: var(--secondary);
      color: var(--text-light);
      padding: 3px 12px;
      border-radius: 20px;
      font-weight: 500;
      font-family: 'Roboto', sans-serif;
    }
    .driver-match-module .spec-list { list-style: none; padding: 0; margin: 0 0 24px; flex: 1; }
    .driver-match-module .spec-list li {
      display: flex;
      justify-content: space-between;
      padding: 11px 0;
      border-bottom: 1px dashed #eaecf0;
      font-size: .95rem;
      gap: 10px;
    }
    .driver-match-module .spec-list li:last-child { border-bottom: none; }
    .driver-match-module .spec-list .label { font-weight: 500; color: var(--text-light); }
    .driver-match-module .spec-list .value { font-weight: 500; color: var(--text); text-align: right; }
    .driver-match-module .spec-list .value .highlight { color: var(--primary); font-weight: 600; }
    .driver-match-module .btn-link {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      background: var(--primary);
      color: #fff;
      border-radius: 30px;
      font-weight: 500;
      font-size: .95rem;
      text-decoration: none;
      transition: var(--transition);
      border: none;
      margin-top: 6px;
      align-self: flex-start;
      box-shadow: 0 4px 12px rgba(42,92,170,.22);
    }
    .driver-match-module .btn-link:hover {
      background: var(--primary-dark);
      transform: translateY(-3px);
      box-shadow: 0 10px 22px rgba(42,92,170,.32);
    }

    /* ------- Downloads ------- */
    .downloads-section { padding: 80px 0; }
    .download-list { list-style: none; max-width: 820px; margin: 0 auto; }
    .download-item { margin-bottom: 12px; }
    .download-link {
      display: flex;
      align-items: center;
      padding: 16px 24px;
      background: #fff;
      border-radius: var(--radius-sm);
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      font-size: .95rem;
    }
    .download-link:hover {
      transform: translateX(8px);
      background: var(--primary);
      color: #fff;
      box-shadow: var(--shadow);
      border-color: var(--primary);
    }

    /* ------- Applications / About ------- */
    .about-section { padding: 80px 0; text-align: center; background: #fff; }
    .about-content { max-width: 820px; margin: 0 auto; padding: 0 24px; }
    .about-content p { color: var(--text-light); margin-bottom: 18px; }
    .contact-button {
      display: inline-block;
      margin-top: 28px;
      padding: 14px 40px;
      background: var(--primary);
      color: #fff;
      border-radius: 30px;
      text-decoration: none;
      font-weight: 500;
      transition: var(--transition);
      box-shadow: 0 6px 18px rgba(42,92,170,.25);
    }
    .contact-button:hover {
      background: var(--primary-light);
      transform: translateY(-3px);
      box-shadow: 0 10px 26px rgba(42,92,170,.35);
    }

    /* ------- Responsive ------- */
    @media (max-width: 1024px) {
      .update-module .methods-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        max-width: 900px;
      }
    }
    @media (max-width: 900px) {
      .hero-content { grid-template-columns: 1fr; text-align: center; gap: 40px; }
      .hero-text { padding-right: 0; }
      .driver-match-module .driver-grid { grid-template-columns: 1fr; }
      .specs-grid { padding: 24px; gap: 0; }
    }
    @media (max-width: 768px) {
      .hero-section { padding: 64px 0; }
      .hero-title { font-size: 2rem; }
      .section-title,
      .update-module .section-header h2,
      .driver-match-module .section-header h2 { font-size: 1.7rem; }
      .feature-section,
      .update-module,
      .specs-section,
      .drawing-section,
      .driver-match-module,
      .downloads-section,
      .about-section { padding: 60px 0; }
      .update-module .methods-grid {
        grid-template-columns: 1fr;
        max-width: 520px;
      }
      .update-module .methods-note {
        flex-direction: column;
        gap: 8px;
      }
      .spec-item { flex-direction: column; align-items: flex-start; gap: 4px; }
      .spec-item span:last-child { text-align: left; }
    }
    @media (max-width: 480px) {
      .hero-title { font-size: 1.7rem; }
      .update-module .btn { max-width: 100%; }
      .driver-match-module .spec-list li { flex-direction: column; align-items: flex-start; gap: 2px; }
      .driver-match-module .spec-list .value { text-align: left; }
    }