/* roulang page: index */
:root {
      --primary: #5B2C8E;
      --primary-light: #9B59B6;
      --accent: #F39C12;
      --bg-light: #FAF9FC;
      --bg-dark: #1E1A24;
      --text-primary: #1E1E1E;
      --text-secondary: #5C5C5C;
      --text-light: #FFFFFF;
      --border-light: #E8E8E8;
      --border-input: #D0D0D0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(91,44,142,0.15);
      --nav-width: 240px;
      --transition: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: "Inter", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
    }

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

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

    /* 自定义Bootstrap覆盖 */
    .btn {
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: var(--transition);
      letter-spacing: 0.3px;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      border: none;
      color: var(--text-light);
    }

    .btn-primary:hover, .btn-primary:focus {
      background: linear-gradient(135deg, #4a2375, #8e44ad);
      box-shadow: 0 6px 18px rgba(91,44,142,0.3);
      transform: translateY(-1px);
    }

    .btn-outline-primary {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }

    .btn-outline-primary:hover {
      background: rgba(91,44,142,0.08);
      border-color: var(--primary-light);
      color: var(--primary-light);
    }

    .btn-accent {
      background: var(--accent);
      border: none;
      color: #1E1E1E;
      font-weight: 700;
      box-shadow: 0 4px 12px rgba(243,156,18,0.3);
    }

    .btn-accent:hover {
      background: #e67e22;
      box-shadow: 0 8px 20px rgba(243,156,18,0.45);
      transform: translateY(-2px);
    }

    .card {
      border-radius: var(--radius-card);
      border: 1px solid #EEEEEE;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      background: #FFFFFF;
    }

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

    .form-control {
      border-radius: 8px;
      border: 1px solid var(--border-input);
      padding: 12px 16px;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(91,44,142,0.15);
    }

    /* 左侧竖向导航 */
    .sidebar-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: var(--nav-width);
      height: 100vh;
      background-color: var(--bg-dark);
      display: flex;
      flex-direction: column;
      padding: 2rem 1.5rem;
      z-index: 1040;
      box-shadow: 2px 0 15px rgba(0,0,0,0.2);
    }

    .brand-logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--text-light);
      letter-spacing: 1px;
      margin-bottom: 2.5rem;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .brand-logo i {
      color: var(--accent);
      font-size: 2rem;
    }

    .nav-menu {
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
      flex: 1;
    }

    .nav-link {
      color: #CCCCCC;
      padding: 10px 16px;
      border-radius: 8px;
      font-weight: 500;
      transition: var(--transition);
      border-left: 3px solid transparent;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .nav-link i {
      width: 20px;
      text-align: center;
    }

    .nav-link:hover, .nav-link.active {
      background: rgba(255,255,255,0.05);
      color: var(--accent);
      border-left-color: var(--accent);
      padding-left: 22px;
    }

    .main-content {
      margin-left: var(--nav-width);
      width: calc(100% - var(--nav-width));
    }

    /* 移动端顶部导航 */
    .mobile-nav {
      display: none;
      background: var(--bg-dark);
      padding: 0.8rem 1.2rem;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1050;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 2px 10px rgba(0,0,0,0.3);
    }

    .offcanvas {
      background-color: var(--bg-dark);
      color: #CCCCCC;
    }

    .offcanvas .nav-link {
      color: #CCCCCC;
    }

    .offcanvas .nav-link:hover {
      color: var(--accent);
      background: rgba(255,255,255,0.05);
    }

    /* Hero区域 */
    .hero-section {
      background: radial-gradient(circle at 30% 40%, #3a1f5c, #0e0a12);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero-bg-img {
      position: absolute;
      right: 0;
      top: 0;
      width: 55%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.3;
      mask-image: linear-gradient(to left, rgba(0,0,0,0.8), transparent);
      -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,0.8), transparent);
    }

    .hero-text {
      position: relative;
      z-index: 2;
      padding: 2rem;
    }

    .hero-text h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 1.5rem;
    }

    .hero-text .lead {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.8);
      max-width: 550px;
    }

    /* 指标看板 */
    .metric-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 1.8rem 1.5rem;
      text-align: center;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--primary-light);
    }

    .metric-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }

    /* 服务卡片图片 */
    .service-img {
      height: 160px;
      object-fit: cover;
      border-radius: var(--radius-card) var(--radius-card) 0 0;
      background-color: #f0e6f6;
    }

    /* FAQ手风琴自定义 */
    .accordion-button {
      font-weight: 600;
      font-size: 1.1rem;
      box-shadow: none;
      border: 1px solid var(--border-light);
      border-radius: 8px !important;
      background: white;
      color: var(--text-primary);
      padding: 16px 20px;
    }

    .accordion-button:not(.collapsed) {
      background-color: #f9f5ff;
      color: var(--primary);
      border-color: var(--primary-light);
    }

    .accordion-button::after {
      filter: brightness(0) saturate(100%) invert(20%) sepia(88%) saturate(2000%) hue-rotate(265deg);
    }

    /* 对比面板 */
    .compare-badge {
      background: var(--accent);
      color: #1E1E1E;
      font-weight: 700;
      border-radius: 50px;
      padding: 8px 20px;
      display: inline-block;
    }

    .traditional-list li {
      text-decoration: line-through;
      color: #999;
    }

    /* 页脚 */
    .footer {
      background: var(--bg-dark);
      color: #BBBBBB;
      padding: 3rem 0 1.5rem;
    }

    .footer a {
      color: #CCCCCC;
    }

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

    .social-icon {
      width: 38px;
      height: 38px;
      border: 1px solid #555;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-right: 8px;
      transition: var(--transition);
    }

    .social-icon:hover {
      background: var(--accent);
      border-color: var(--accent);
      color: #1E1E1E;
    }

    @media (max-width: 992px) {
      .sidebar-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
        padding-top: 56px;
      }
      .hero-section {
        min-height: auto;
        padding: 5rem 0 3rem;
      }
      .hero-bg-img {
        width: 100%;
        opacity: 0.25;
      }
      .hero-text h1 {
        font-size: 2.5rem;
      }
    }

    @media (max-width: 768px) {
      .metric-number {
        font-size: 2.2rem;
      }
    }