/* roulang page: index */
/* :root 设计变量 — 彻底覆盖 Bootstrap 默认令牌 */
    :root {
      --primary-deep: #1B2A2E;
      --accent-orange: #F15A24;
      --bg-warm: #F7F8F3;
      --white: #FFFFFF;
      --text-body: #3A4A4F;
      --text-muted: #5D6D73;
      --text-light-bg: #B0BEC5;
      --border-light: rgba(27, 42, 46, 0.08);
      --border-medium: #E0E5E7;
      --shadow-sm: 0 4px 20px rgba(27, 42, 46, 0.06);
      --shadow-hover: 0 12px 32px rgba(27, 42, 46, 0.12);
      --radius-card: 12px;
      --radius-btn: 30px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      
      /* 覆盖 Bootstrap 核心变量 */
      --bs-primary: #F15A24;
      --bs-primary-rgb: 241, 90, 36;
      --bs-body-color: #3A4A4F;
      --bs-body-bg: #F7F8F3;
      --bs-border-radius: 12px;
      --bs-link-color: #F15A24;
      --bs-link-hover-color: #D94A1A;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.75;
      margin: 0;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }

    /* 容器微调 */
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 标题层级纪律 */
    h1 {
      font-weight: 700;
      letter-spacing: -0.5px;
      color: #FFFFFF;
    }
    h2 {
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: -0.3px;
      margin-bottom: 1rem;
    }
    h3 {
      font-weight: 600;
      color: var(--primary-deep);
      font-size: 1.25rem;
    }
    h4 {
      font-weight: 600;
      color: var(--primary-deep);
      font-size: 1.1rem;
    }

    /* 自定义导航栏 — 资讯门户吸顶风格 */
    .navbar-custom {
      background: rgba(27, 42, 46, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: all 0.3s ease;
      padding: 0.8rem 0;
    }
    .navbar-scrolled {
      background: rgba(18, 28, 31, 0.96);
      border-bottom: 1px solid rgba(241, 90, 36, 0.3);
    }
    .navbar-brand {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 1.6rem;
      color: #FFFFFF !important;
      letter-spacing: 1px;
      transition: color 0.2s;
    }
    .navbar-brand span {
      color: var(--accent-orange);
    }
    .navbar-custom .nav-link {
      color: #B0BEC5 !important;
      font-weight: 500;
      margin: 0 0.5rem;
      padding: 0.5rem 0.8rem;
      border-radius: 20px;
      transition: all 0.2s;
    }
    .navbar-custom .nav-link:hover,
    .navbar-custom .nav-link.active {
      color: var(--accent-orange) !important;
      background: rgba(241, 90, 36, 0.1);
    }
    .btn-primary-custom {
      background: var(--accent-orange);
      border: none;
      color: #FFFFFF;
      font-weight: 600;
      border-radius: 30px;
      padding: 10px 28px;
      transition: all 0.25s ease;
      box-shadow: none;
    }
    .btn-primary-custom:hover {
      background: #D94A1A;
      box-shadow: 0 0 20px rgba(241, 90, 36, 0.5);
      color: #FFF;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid #FFFFFF;
      color: #FFFFFF;
      font-weight: 600;
      border-radius: 30px;
      padding: 10px 28px;
      transition: all 0.25s;
    }
    .btn-outline-custom:hover {
      background: #FFFFFF;
      color: var(--primary-deep);
    }
    .btn-outline-dark-custom {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      font-weight: 600;
      border-radius: 30px;
      padding: 10px 28px;
    }
    .btn-outline-dark-custom:hover {
      background: var(--primary-deep);
      color: #FFF;
    }
    .navbar-toggler {
      border: none;
      color: #FFF;
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }

    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    /* Hero 抽象光效背景 */
    .hero-section {
      background: linear-gradient(135deg, #1B2A2E 0%, #0F1A1D 100%);
      position: relative;
      overflow: hidden;
      min-height: 100vh;
      display: flex;
      align-items: center;
    }
    .hero-section::before {
      content: "";
      position: absolute;
      top: -20%;
      right: -10%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(241,90,36,0.25) 0%, transparent 70%);
      border-radius: 50%;
      filter: blur(60px);
    }
    .hero-section::after {
      content: "";
      position: absolute;
      bottom: -15%;
      left: -5%;
      width: 450px;
      height: 450px;
      background: radial-gradient(circle, rgba(27,42,46,0.8) 0%, transparent 70%);
      border-radius: 50%;
      filter: blur(70px);
      border: 1px solid rgba(241,90,36,0.2);
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: 3.5rem;
      font-weight: 700;
      color: #FFFFFF;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #B0BEC5;
      line-height: 1.8;
      margin: 1.5rem 0 2rem;
    }

    /* 卡片通用样式 */
    .card-service {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      height: 100%;
      padding: 2rem 1.5rem;
    }
    .card-service:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--accent-orange);
    }
    .icon-placeholder {
      width: 48px;
      height: 48px;
      background: rgba(241,90,36,0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.2rem;
    }
    .data-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--accent-orange);
      line-height: 1;
    }
    .divider-vertical {
      width: 1px;
      height: 40px;
      background: #E0E5E7;
      margin: 0 auto;
    }
    @media (max-width: 576px) {
      .divider-vertical {
        width: 60px;
        height: 1px;
        margin: 15px auto;
      }
    }

    /* 案例卡片 */
    .case-card {
      background: #FFFFFF;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border: 1px solid var(--border-light);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img-placeholder {
      background: #d1d8db;
      aspect-ratio: 16/9;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #5D6D73;
      font-weight: 500;
      background-size: cover;
    }
    .tag-orange {
      background: var(--accent-orange);
      color: #FFF;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    /* 解决方案图文区 */
    .solution-img {
      background: #e9edef;
      border-radius: var(--radius-card);
      aspect-ratio: 4/3;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #5D6D73;
    }

    /* FAQ 手风琴自定义 */
    .accordion-custom .accordion-item {
      border: 1px solid #E0E5E7;
      background: #FFFFFF;
      border-radius: 12px !important;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .accordion-custom .accordion-button {
      font-weight: 600;
      color: var(--primary-deep);
      background: #FFFFFF;
      box-shadow: none;
      border-radius: 12px !important;
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      background: #FFFFFF;
      color: var(--accent-orange);
      border-bottom: 1px solid var(--accent-orange);
    }
    .accordion-custom .accordion-button::after {
      transition: transform 0.3s;
    }
    .accordion-custom .accordion-body {
      background: #F7F8F3;
      color: #3A4A4F;
      border-top: none;
    }

    /* CTA 区块 */
    .cta-section {
      background: var(--primary-deep);
    }
    .footer-custom {
      background: #0F1A1D;
      color: #8899A0;
    }
    .footer-custom a {
      color: #8899A0;
      text-decoration: none;
    }
    .footer-custom a:hover {
      color: var(--accent-orange);
    }
    .qr-placeholder {
      width: 80px;
      height: 80px;
      background: #2d3a3e;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #8899A0;
      font-size: 0.7rem;
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .btn-primary-custom, .btn-outline-custom {
        width: 100%;
        margin-bottom: 10px;
      }
    }