/* roulang page: index */
:root {
            --primary: #0F52BA;
            --primary-dark: #0A3B85;
            --accent: #0D9488;
            --dark-slate: #0F172A;
            --bg-base: #F8FAFC;
            --surface-muted: #F1F5F9;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-line: #E2E8F0;
            --radius-box: 1rem;
            --shadow-soft: 0 10px 30px -5px rgba(15, 23, 42, 0.05), 0 4px 6px -2px rgba(15, 23, 42, 0.02);
            --shadow-hover: 0 20px 35px -5px rgba(15, 82, 186, 0.12), 0 8px 10px -4px rgba(15, 82, 186, 0.05);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-base);
            color: var(--text-body);
            overflow-x: hidden;
        }
        .container-custom {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }
        .custom-card {
            background-color: #FFFFFF;
            border: 1px solid rgba(226, 232, 240, 0.9);
            border-radius: var(--radius-box);
            box-shadow: var(--shadow-soft);
            transition: all 0.28s ease-in-out;
        }
        .custom-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
            border-color: rgba(15, 82, 186, 0.25);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background-color: var(--primary);
            color: #ffffff;
            font-weight: 600;
            padding: 0.875rem 1.75rem;
            border-radius: 0.75rem;
            transition: all 0.2s ease;
            box-shadow: 0 4px 14px rgba(15, 82, 186, 0.3);
        }
        .btn-primary:hover {
            background-color: var(--primary-dark);
            box-shadow: 0 6px 20px rgba(15, 82, 186, 0.4);
            transform: translateY(-1px);
        }
        .btn-accent {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background-color: var(--accent);
            color: #ffffff;
            font-weight: 600;
            padding: 0.875rem 1.75rem;
            border-radius: 0.75rem;
            transition: all 0.2s ease;
            box-shadow: 0 4px 14px rgba(13, 148, 136, 0.25);
        }
        .btn-accent:hover {
            background-color: #0b7a70;
            transform: translateY(-1px);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background-color: #ffffff;
            color: var(--primary);
            border: 1px solid #CBD5E1;
            font-weight: 600;
            padding: 0.875rem 1.75rem;
            border-radius: 0.75rem;
            transition: all 0.2s ease;
        }
        .btn-outline:hover {
            background-color: #F8FAFC;
            border-color: var(--primary);
        }
        .section-padding {
            padding-top: 5.5rem;
            padding-bottom: 5.5rem;
        }
        .badge-chip {
            display: inline-flex;
            align-items: center;
            gap: 0.375rem;
            padding: 0.35rem 0.85rem;
            border-radius: 9999px;
            font-size: 0.8125rem;
            font-weight: 600;
            background-color: rgba(15, 82, 186, 0.08);
            color: var(--primary);
            border: 1px solid rgba(15, 82, 186, 0.15);
        }