/* roulang page: index */
/* ----- 自定义设计系统 & Foundation 覆盖 ----- */
    :root {
      --primary-deep: #1E2A38;   /* 墨晶灰 */
      --accent-amber: #F59E0B;   /* 琥珀橙 */
      --bg-white: #FFFFFF;
      --bg-light: #F8F9FA;
      --text-dark: #1E2A38;
      --text-muted: #5B6C7D;
      --text-light: #F0F3F5;
      --border-light: #E2E8F0;
      --shadow-card: 0px 10px 30px -10px rgba(0,0,0,0.08);
      --shadow-hover: 0px 20px 35px -12px rgba(0,0,0,0.12);
      --radius-card: 16px;
      --radius-capsule: 50px;
      --radius-small: 12px;
      --transition: 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      margin: 0;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    /* 容器微调 */
    .custom-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 标题字体 */
    h1, h2, h3, .hero-title, .section-title {
      font-family: 'Noto Sans SC', sans-serif;
      font-weight: 900;
      letter-spacing: -0.5px;
    }

    /* ----- 导航栏：卡片化控制面板 ----- */
    .ng-nav {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      margin: 1.2rem auto 0;
      width: 90%;
      padding: 0.6rem 1.8rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      position: sticky;
      top: 1rem;
      z-index: 50;
      border: 1px solid rgba(226,232,240,0.3);
    }
    .nav-logo {
      display: flex;
      align-items: baseline;
      gap: 4px;
      font-weight: 900;
      font-size: 1.8rem;
      font-family: 'Noto Sans SC', sans-serif;
      color: var(--primary-deep);
      text-decoration: none;
      letter-spacing: -0.3px;
    }
    .nav-logo .logo-highlight {
      color: var(--accent-amber);
      font-weight: 900;
    }
    .nav-logo .domain-sub {
      font-size: 0.7rem;
      font-weight: 400;
      color: var(--text-muted);
      margin-left: 2px;
      letter-spacing: 0;
      align-self: flex-end;
      margin-bottom: 0.2rem;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-menu li a {
      display: flex;
      align-items: center;
      gap: 6px;
      text-decoration: none;
      font-weight: 500;
      color: var(--primary-deep);
      padding: 0.5rem 1rem;
      border-radius: 30px;
      transition: var(--transition);
      background: transparent;
      font-size: 0.95rem;
      white-space: nowrap;
    }
    .nav-menu li a i {
      font-size: 1rem;
      color: var(--accent-amber);
    }
    .nav-menu li a:hover {
      background: rgba(245,158,11,0.08);
      color: var(--primary-deep);
    }
    .nav-cta {
      background: var(--accent-amber);
      color: var(--primary-deep) !important;
      font-weight: 700;
      padding: 0.6rem 1.8rem !important;
      border-radius: var(--radius-capsule) !important;
      box-shadow: 0 4px 10px rgba(245,158,11,0.3);
      transition: var(--transition);
      margin-left: 0.5rem;
    }
    .nav-cta:hover {
      background: #e08f0a;
      box-shadow: 0 8px 18px rgba(245,158,11,0.4);
    }

    /* 移动端汉堡菜单隐藏（Foundation的响应式类辅助） */
    .mobile-toggle {
      display: none;
      background: transparent;
      border: none;
      font-size: 1.6rem;
      color: var(--primary-deep);
    }

    /* ----- 通用板块间距 ----- */
    section {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2.8rem;
      margin-bottom: 1rem;
      color: var(--primary-deep);
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 1.25rem;
      max-width: 700px;
      margin: 0 auto 3rem;
    }
    .text-amber {
      color: var(--accent-amber);
    }

    /* ----- 按钮系统 ----- */
    .btn-primary {
      background: var(--accent-amber);
      color: var(--primary-deep);
      font-weight: 700;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-capsule);
      border: none;
      display: inline-block;
      text-decoration: none;
      transition: var(--transition);
      box-shadow: 0 6px 14px rgba(245,158,11,0.25);
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      background: #e08f0a;
      box-shadow: 0 12px 22px rgba(245,158,11,0.35);
      color: var(--primary-deep);
    }
    .btn-outline {
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      background: transparent;
      font-weight: 600;
      padding: 0.85rem 2rem;
      border-radius: var(--radius-capsule);
      transition: var(--transition);
      display: inline-block;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(30,42,56,0.06);
      border-color: var(--accent-amber);
      color: var(--primary-deep);
    }

    /* 卡片规范 */
    .card-hover {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid rgba(226,232,240,0.5);
    }
    .card-hover:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    /* Hero 区域 */
    .hero-section {
      padding: 3rem 0 5rem;
      background: linear-gradient(180deg, #FFFFFF 0%, #F8F9FA 100%);
    }
    .hero-title {
      font-size: 3.8rem;
      line-height: 1.2;
    }
    .gradient-text {
      background: linear-gradient(135deg, #F59E0B 0%, #D97706 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-visual-card {
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(8px);
      border-radius: 24px;
      padding: 1rem;
      box-shadow: var(--shadow-card);
    }

    /* 服务两栏大卡片 */
    .service-large-card {
      display: flex;
      flex-wrap: wrap;
      background: var(--bg-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      margin-bottom: 2.5rem;
    }
    .service-text {
      padding: 2.8rem;
      flex: 1 1 50%;
    }
    .service-visual {
      flex: 1 1 50%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      min-height: 260px;
    }
    .service-visual img {
      object-fit: cover;
      width: 100%;
      height: 100%;
    }

    /* 深色数据条带 */
    .dark-stats {
      background: #1E2A38;
      background-image: radial-gradient(circle at 20% 30%, #2f3e50 0%, #1E2A38 90%);
      color: white;
      padding: 3.5rem 0;
    }
    .stat-number {
      font-family: 'Inter', sans-serif;
      font-weight: 700;
      font-size: 3.2rem;
      color: var(--accent-amber);
    }

    /* 案例卡片 */
    .case-card {
      border-radius: var(--radius-card);
      overflow: hidden;
      background-size: cover;
      background-position: center;
      position: relative;
      min-height: 280px;
      display: flex;
      align-items: flex-end;
    }
    .case-overlay {
      background: rgba(0,0,0,0.1);
      backdrop-filter: blur(10px);
      width: 100%;
      padding: 1.5rem;
      color: white;
      background: linear-gradient(0deg, rgba(30,42,56,0.9) 0%, rgba(30,42,56,0.3) 100%);
    }

    /* 时间轴 */
    .timeline-step {
      display: flex;
      gap: 2rem;
      margin-bottom: 2.5rem;
      align-items: flex-start;
    }
    .step-number {
      font-family: 'Inter', sans-serif;
      font-weight: 700;
      font-size: 3.5rem;
      color: rgba(30,42,56,0.15);
      line-height: 1;
      min-width: 70px;
    }
    .step-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      flex: 1;
    }

    /* FAQ */
    .accordion-faq .card {
      border-radius: var(--radius-small);
      margin-bottom: 0.8rem;
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .accordion-faq .card-header {
      background: white;
      padding: 1.2rem 1.8rem;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--primary-deep);
    }
    .faq-active-line {
      border-left: 4px solid var(--accent-amber);
    }

    /* 页脚 */
    .footer-dark {
      background: #1E2A38;
      color: #CBD5E0;
      padding: 3.5rem 0 1.5rem;
    }
    .footer-dark a {
      color: #CBD5E0;
      text-decoration: none;
      transition: var(--transition);
    }
    .footer-dark a:hover {
      color: var(--accent-amber);
    }
    .social-circle {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 38px;
      height: 38px;
      border-radius: 50%;
      border: 1px solid #4a5568;
      color: #CBD5E0;
      margin-right: 8px;
      transition: var(--transition);
    }
    .social-circle:hover {
      background: var(--accent-amber);
      border-color: var(--accent-amber);
      color: #1E2A38;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-title { font-size: 2.8rem; }
    }
    @media (max-width: 768px) {
      .ng-nav {
        width: 96%;
        padding: 0.8rem 1.2rem;
        flex-wrap: wrap;
      }
      .nav-menu {
        display: none;
        width: 100%;
        flex-direction: column;
        margin-top: 1rem;
      }
      .nav-menu.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .service-large-card {
        flex-direction: column;
      }
      .hero-title { font-size: 2.2rem; }
      .section-title { font-size: 2.2rem; }
    }
    @media (max-width: 640px) {
      .hero-title { font-size: 2rem; }
      .timeline-step {
        flex-direction: column;
        gap: 0.5rem;
      }
    }