/* roulang page: index */
:root {
      --brand-primary: #1A262C;
      --brand-accent: #FF5A36;
      --brand-dark: #0B1013;
      --brand-dark-nav: #131B1F;
      --brand-topbar: #090D0F;
      --brand-success: #00C07F;
      --brand-light: #F8FAFB;
      --brand-gray-border: rgba(0, 0, 0, 0.08);
      --brand-dark-border: rgba(255, 255, 255, 0.08);
      --font-stack: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-stack);
      color: #2D3748;
      background-color: #FFFFFF;
      line-height: 1.75;
      letter-spacing: 0.02em;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .top-bar {
      background-color: var(--brand-topbar);
      color: #94A3B8;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .top-bar a {
      color: #CBD5E1;
    }
    .top-bar a:hover {
      color: #FFFFFF;
    }
    .main-navbar {
      background-color: var(--brand-dark-nav);
      border-bottom: 1px solid var(--brand-dark-border);
      padding: 14px 0;
    }
    .navbar-brand-text {
      color: #FFFFFF;
      font-size: 20px;
      font-weight: 700;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .navbar-brand-text i {
      color: var(--brand-accent);
      font-size: 24px;
    }
    .nav-link {
      color: #E2E8F0 !important;
      font-size: 15px;
      font-weight: 500;
      padding: 8px 16px !important;
      transition: color 0.2s ease;
    }
    .nav-link:hover, .nav-link:focus {
      color: var(--brand-accent) !important;
    }
    .btn-brand-accent {
      background-color: var(--brand-accent);
      color: #FFFFFF;
      font-weight: 600;
      border: none;
      padding: 10px 24px;
      border-radius: 6px;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-brand-accent:hover {
      background-color: #E64925;
      color: #FFFFFF;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255, 90, 54, 0.35);
    }
    .btn-brand-outline {
      background-color: transparent;
      color: #FFFFFF;
      font-weight: 600;
      border: 1px solid rgba(255, 255, 255, 0.3);
      padding: 10px 24px;
      border-radius: 6px;
      transition: all 0.2s ease;
    }
    .btn-brand-outline:hover {
      background-color: rgba(255, 255, 255, 0.1);
      border-color: #FFFFFF;
      color: #FFFFFF;
    }
    .section-padding {
      padding: 85px 0;
    }
    .bg-light-surface {
      background-color: var(--brand-light);
    }
    .bg-dark-surface {
      background-color: var(--brand-dark);
      color: #E2E8F0;
    }
    .badge-sub {
      background-color: rgba(255, 90, 54, 0.1);
      color: var(--brand-accent);
      font-size: 13px;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 16px;
      border: 1px solid rgba(255, 90, 54, 0.2);
    }
    .badge-sub-dark {
      background-color: rgba(0, 192, 127, 0.12);
      color: var(--brand-success);
      font-size: 13px;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 16px;
      border: 1px solid rgba(0, 192, 127, 0.3);
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: #0F171A;
      margin-bottom: 14px;
      line-height: 1.35;
    }
    .section-title-dark {
      font-size: 32px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 14px;
      line-height: 1.35;
    }
    .section-desc {
      font-size: 16px;
      color: #64748B;
      max-width: 820px;
      margin-bottom: 45px;
    }
    .section-desc-dark {
      font-size: 16px;
      color: #94A3B8;
      max-width: 820px;
      margin-bottom: 45px;
    }
    /* 斜切色块首屏 */
    .hero-slant {
      position: relative;
      background-color: #0D1418;
      padding: 100px 0 120px;
      overflow: hidden;
      color: #FFFFFF;
    }
    .hero-slant::before {
      content: "";
      position: absolute;
      top: 0;
      right: 0;
      width: 55%;
      height: 100%;
      background: linear-gradient(135deg, rgba(26, 38, 44, 0.85), rgba(11, 16, 19, 0.95)), url('/assets/images/9b360cfb8689b15a.jpg') center/cover no-repeat;
      clip-path: polygon(18% 0%, 100% 0%, 100% 100%, 0% 100%);
      z-index: 1;
    }
    .hero-slant-content {
      position: relative;
      z-index: 2;
    }
    .hero-slant h1 {
      font-size: 44px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 24px;
      color: #FFFFFF;
    }
    .hero-slant p {
      font-size: 17px;
      color: #CBD5E1;
      max-width: 620px;
      margin-bottom: 35px;
    }
    /* 卡片体系 */
    .modern-card {
      background: #FFFFFF;
      border: 1px solid var(--brand-gray-border);
      border-radius: 12px;
      padding: 30px;
      transition: all 0.3s ease;
      height: 100%;
      box-shadow: 0 4px 16px rgba(15, 23, 26, 0.04);
    }
    .modern-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 14px 30px rgba(15, 23, 26, 0.08);
      border-color: rgba(255, 90, 54, 0.3);
    }
    .modern-card-dark {
      background: #131B1F;
      border: 1px solid var(--brand-dark-border);
      border-radius: 12px;
      padding: 30px;
      transition: all 0.3s ease;
      height: 100%;
    }
    .modern-card-dark:hover {
      transform: translateY(-5px);
      border-color: rgba(0, 192, 127, 0.4);
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
    }
    .card-icon {
      width: 52px;
      height: 52px;
      border-radius: 10px;
      background-color: rgba(255, 90, 54, 0.08);
      color: var(--brand-accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      margin-bottom: 20px;
    }
    .card-icon-dark {
      width: 52px;
      height: 52px;
      border-radius: 10px;
      background-color: rgba(0, 192, 127, 0.12);
      color: var(--brand-success);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      margin-bottom: 20px;
    }
    .product-img-box {
      border-radius: 8px;
      overflow: hidden;
      margin-bottom: 20px;
      height: 200px;
    }
    .product-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .modern-card:hover .product-img-box img {
      transform: scale(1.05);
    }
    /* 对比表格卡片 */
    .compare-box {
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--brand-gray-border);
    }
    .compare-header-bad {
      background-color: #F1F5F9;
      color: #475569;
      padding: 18px 24px;
      font-weight: 700;
      border-bottom: 1px solid #E2E8F0;
    }
    .compare-header-good {
      background-color: var(--brand-primary);
      color: #FFFFFF;
      padding: 18px 24px;
      font-weight: 700;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    .compare-body {
      background-color: #FFFFFF;
      padding: 24px;
    }
    .compare-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 15px;
    }
    .compare-item i {
      font-size: 18px;
      margin-top: 3px;
    }
    /* 统计条 */
    .stat-bar {
      background: #0F171A;
      border-top: 1px solid var(--brand-dark-border);
      border-bottom: 1px solid var(--brand-dark-border);
      padding: 45px 0;
      color: #FFFFFF;
    }
    .stat-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--brand-accent);
      line-height: 1.1;
      margin-bottom: 6px;
      font-family: Arial, sans-serif;
    }
    .stat-label {
      font-size: 14px;
      color: #94A3B8;
      font-weight: 500;
    }
    /* FAQ 手风琴重塑 */
    .accordion-item {
      border: 1px solid var(--brand-gray-border);
      border-radius: 8px !important;
      margin-bottom: 14px;
      overflow: hidden;
    }
    .accordion-button {
      font-weight: 600;
      font-size: 16px;
      color: #0F171A;
      background-color: #FFFFFF;
      padding: 18px 22px;
      box-shadow: none !important;
    }
    .accordion-button:not(.collapsed) {
      color: var(--brand-accent);
      background-color: #FFF7F5;
    }
    .accordion-body {
      color: #64748B;
      font-size: 15px;
      padding: 20px 22px;
      line-height: 1.8;
      background-color: #FFFFFF;
    }
    /* 表单控件 */
    .form-control, .form-select {
      height: 48px;
      border-radius: 6px;
      border: 1px solid #CBD5E1;
      padding: 0 16px;
      font-size: 15px;
    }
    .form-control:focus, .form-select:focus {
      border-color: var(--brand-accent);
      box-shadow: 0 0 0 3px rgba(255, 90, 54, 0.15);
    }
    /* 页脚 */
    .main-footer {
      background-color: var(--brand-dark);
      color: #94A3B8;
      padding: 70px 0 30px;
      font-size: 14px;
      border-top: 1px solid var(--brand-dark-border);
    }
    .footer-title {
      color: #FFFFFF;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .footer-links {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-links li {
      margin-bottom: 12px;
    }
    .footer-links a {
      color: #94A3B8;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      margin-top: 50px;
      padding-top: 25px;
      font-size: 13px;
      color: #64748B;
    }

    @media (max-width: 991px) {
      .hero-slant::before {
        width: 100%;
        clip-path: none;
        opacity: 0.15;
      }
      .hero-slant {
        padding: 60px 0 80px;
      }
      .hero-slant h1 {
        font-size: 32px;
      }
      .section-title, .section-title-dark {
        font-size: 26px;
      }
      .stat-number {
        font-size: 34px;
      }
      .section-padding {
        padding: 60px 0;
      }
    }