/* roulang page: index */
:root {
            --primary: #10B981;
            --primary-accent: #0EA5E9;
            --warm: #F59E0B;
            --dark-navy: #0F172A;
            --bg-base: #F8FAFC;
            --card-radius: 20px;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: var(--bg-base);
            color: #1E293B;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
        }
        .hero-banner {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(16, 185, 129, 0.85) 100%), url('/assets/images/0ffa80ccd3d12fb5.jpg') center/cover no-repeat;
        }
        .deep-section {
            background-color: var(--dark-navy);
            background-image: radial-gradient(circle at 15% 50%, rgba(14, 165, 233, 0.15), transparent 30%), radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.15), transparent 30%);
        }
        .badge-pill {
            display: inline-flex;
            align-items: center;
            padding: 4px 14px;
            border-radius: 9999px;
            font-size: 0.85rem;
            font-weight: 500;
            backdrop-filter: blur(8px);
        }
        .card-scale {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-scale:hover {
            transform: translateY(-6px);
            box-shadow: 0 20px 30px -10px rgba(0, 0, 0, 0.12);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-content.active {
            max-height: 300px;
        }
        .rotate-icon {
            transition: transform 0.3s ease;
        }
        .rotate-icon.active {
            transform: rotate(180deg);
        }