/* roulang page: index */
:root {
            --primary: #0e7490;
            --accent: #f97316;
            --dark: #0f172a;
            --light-bg: #f8fafc;
            --text-main: #0f172a;
            --text-muted: #475569;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            color: var(--text-main);
            background-color: #ffffff;
            line-height: 1.75;
        }
        .hero-bg-overlay {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.95) 0%, rgba(14, 116, 144, 0.88) 100%), url('/assets/images/fa6cc4eb67b0fe60.webp') center/cover no-repeat;
        }
        .sub-bg-banner {
            background: linear-gradient(rgba(15, 23, 42, 0.85), rgba(15, 23, 42, 0.9)), url('/assets/images/5b83dc56d193eb2c.jpg') center/cover no-repeat;
        }