/* roulang page: index */
:root {
      --primary-deep: #1A1A2E;
      --accent-warm: #E8D5B7;
      --highlight-gold: #D4AF37;
      --bg-warm: #FAF9F6;
      --text-body: #2E2E2E;
      --text-heading: #1A1A2E;
      --text-muted: #5A5A5A;
      --white: #FFFFFF;
      --card-border: rgba(212, 175, 55, 0.15);
      --card-shadow: 0 8px 24px rgba(26, 26, 46, 0.06);
      --card-shadow-hover: 0 16px 32px rgba(26, 26, 46, 0.12);
      --border-radius-lg: 12px;
      --border-radius-btn: 8px;
      --transition: all 0.25s ease;
      --font-heading: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
      --font-body: 'Noto Serif SC', 'PingFang SC', 'Microsoft YaHei', 'STSong', Georgia, serif;
      --container-max: 1140px;
      --section-gap: 100px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      color: var(--text-body);
      background-color: var(--bg-warm);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .h1, .h2, .h3, .navbar-brand, .btn, .nav-link {
      font-family: var(--font-heading);
      font-weight: 700;
      color: var(--text-heading);
    }

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

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

    /* 容器自定义 */
    .container-custom {
      max-width: var(--container-max);
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    section {
      padding: var(--section-gap) 0;
    }

    /* 顶部信息条 */
    .top-infobar {
      background-color: var(--primary-deep);
      color: var(--accent-warm);
      font-size: 0.75rem;
      height: 36px;
      display: flex;
      align-items: center;
      font-family: var(--font-heading);
      letter-spacing: 0.5px;
    }
    .top-infobar a {
      color: var(--accent-warm);
      font-weight: 600;
      margin-left: 6px;
    }
    .top-infobar a i {
      margin-right: 4px;
      font-size: 0.7rem;
      color: var(--highlight-gold);
    }

    /* 主导航 sticky */
    .navbar-custom {
      background-color: var(--white);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      position: sticky;
      top: 0;
      z-index: 1020;
      padding: 0;
      font-family: var(--font-heading);
    }
    .navbar-brand {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-deep) !important;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .brand-icon {
      color: var(--highlight-gold);
      font-size: 1.8rem;
    }
    .nav-link {
      color: var(--text-body) !important;
      font-weight: 500;
      margin: 0 4px;
      padding: 0.5rem 0.8rem !important;
      position: relative;
      transition: var(--transition);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background-color: var(--accent-warm);
      transition: width 0.2s ease;
    }
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 70%;
    }
    .nav-link:hover {
      color: var(--primary-deep) !important;
    }
    .navbar-toggler {
      border: none;
      color: var(--primary-deep);
      font-size: 1.3rem;
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }

    /* 按钮体系 */
    .btn-primary-custom {
      background-color: var(--accent-warm);
      color: var(--primary-deep);
      border: none;
      padding: 0.7rem 2rem;
      font-weight: 700;
      border-radius: var(--border-radius-btn);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-primary-custom:hover {
      background-color: var(--highlight-gold);
      color: var(--primary-deep);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(212,175,55,0.3);
    }
    .btn-outline-custom {
      background: transparent;
      border: 1px solid var(--accent-warm);
      color: var(--accent-warm);
      padding: 0.7rem 2rem;
      font-weight: 600;
      border-radius: var(--border-radius-btn);
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background-color: var(--accent-warm);
      color: var(--primary-deep);
      border-color: var(--accent-warm);
    }

    /* Hero 区域 */
    .hero-section {
      background: linear-gradient(135deg, #1A1A2E 0%, #16213E 100%);
      color: white;
      padding: 80px 0 100px;
      position: relative;
      overflow: hidden;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      color: white;
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      margin: 1.5rem 0 2rem;
      max-width: 550px;
    }
    .hero-image-bg {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 320px;
      border-radius: 24px;
      opacity: 0.9;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }

    /* 核心优势 非对称栅格 */
    .advantage-card {
      background: var(--white);
      padding: 2rem 1.8rem;
      border-radius: var(--border-radius-lg);
      border-bottom: 4px solid var(--accent-warm);
      height: 100%;
      transition: var(--transition);
    }
    .advantage-card:hover {
      border-bottom-color: var(--highlight-gold);
      box-shadow: var(--card-shadow-hover);
    }
    .advantage-icon {
      font-size: 2.4rem;
      color: var(--highlight-gold);
      margin-bottom: 1rem;
    }

    /* 服务卡片 */
    .service-card {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--border-radius-lg);
      box-shadow: var(--card-shadow);
      overflow: hidden;
      transition: var(--transition);
      height: 100%;
    }
    .service-card:hover {
      box-shadow: var(--card-shadow-hover);
      border-color: var(--accent-warm);
    }
    .service-img {
      height: 180px;
      object-fit: cover;
    }
    .service-body {
      padding: 1.5rem;
    }
    .service-features {
      list-style: none;
      padding-left: 0;
    }
    .service-features li::before {
      content: "✦";
      color: var(--highlight-gold);
      margin-right: 8px;
    }

    /* 流程步骤 */
    .step-circle {
      width: 56px;
      height: 56px;
      background-color: var(--accent-warm);
      color: var(--primary-deep);
      font-weight: 800;
      font-size: 1.6rem;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 15px;
    }
    .step-connector {
      border-top: 2px dashed var(--accent-warm);
      flex: 1;
      margin: 0 12px;
      align-self: center;
      opacity: 0.8;
    }

    /* 案例卡片 */
    .case-card {
      background: #F5F3EF;
      border-radius: var(--border-radius-lg);
      overflow: hidden;
      display: flex;
      flex-wrap: wrap;
      box-shadow: var(--card-shadow);
    }
    .case-img {
      flex: 1 1 45%;
      min-height: 240px;
      object-fit: cover;
    }
    .case-content {
      flex: 1 1 55%;
      padding: 2rem;
    }
    .metric-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--highlight-gold);
      line-height: 1.1;
    }

    /* FAQ 手风琴 */
    .accordion-button {
      font-weight: 700;
      font-family: var(--font-heading);
      background-color: transparent;
      box-shadow: none;
      border: 1px solid transparent;
      padding: 1.2rem 1.5rem;
    }
    .accordion-button:not(.collapsed) {
      background-color: rgba(232,213,183,0.08);
      border-left: 4px solid var(--accent-warm);
      color: var(--primary-deep);
    }
    .accordion-item {
      border: 1px solid var(--card-border);
      margin-bottom: 12px;
      border-radius: var(--border-radius-lg) !important;
    }

    /* 全局CTA横幅 */
    .cta-banner {
      background-color: var(--primary-deep);
      color: white;
      border-radius: 24px;
      padding: 3.5rem 2rem;
      text-align: center;
    }

    /* 页脚 */
    .footer-custom {
      background-color: var(--primary-deep);
      color: var(--accent-warm);
      padding: 3rem 0 2rem;
    }
    .footer-custom a {
      color: var(--accent-warm);
    }
    .footer-custom a:hover {
      color: var(--highlight-gold);
    }

    @media (max-width: 768px) {
      :root {
        --section-gap: 60px;
      }
      .hero-title {
        font-size: 32px;
      }
      .step-connector {
        display: none;
      }
      .case-card {
        flex-direction: column;
      }
      .navbar-collapse {
        background: white;
        padding: 1rem;
      }
    }