/* roulang page: index */
:root {
            --primary: #FF5500;
            --primary-hover: #E04B00;
            --secondary: #10B981;
            --accent: #0EA5E9;
            --bg-light: #F8FAFC;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
            color: var(--text-body);
            background-color: var(--bg-light);
            line-height: 1.75;
            overflow-x: hidden;
        }

        .hero-banner-bg {
            background-image: linear-gradient(to bottom, rgba(15, 23, 42, 0.75), rgba(11, 15, 25, 0.92)), url('/assets/images/929e5c51661cbc71.jpg');
            background-size: cover;
            background-position: center;
        }

        .section-dark {
            background-color: #0F172A;
            color: #F8FAFC;
        }

        .card-custom {
            background: #FFFFFF;
            border-radius: 14px;
            box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
            transition: all 0.25s ease;
        }

        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 28px -4px rgba(15, 23, 42, 0.12);
        }

        .btn-brand {
            background-color: var(--primary);
            color: #ffffff;
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 44px;
            padding: 0.65rem 1.6rem;
            border-radius: 8px;
            font-weight: 600;
        }

        .btn-brand:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
        }

        .smooth-scroll {
            scroll-behavior: smooth;
        }