/* roulang page: index */
:root {
            --bg-main: #0F172A;
            --bg-card: #1E293B;
            --color-primary: #6366F1;
            --color-secondary: #06B6D4;
            --color-accent: #F59E0B;
            --text-main: #F8FAFC;
            --text-muted: #94A3B8;
            --border-color: #334155;
        }
        body {
            background-color: var(--bg-main);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            overflow-x: hidden;
        }
        .glass-header {
            background: rgba(15, 23, 42, 0.88);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }
        .hero-mesh {
            background-image: radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.18) 0px, transparent 50%),
                              radial-gradient(at 100% 100%, rgba(6, 182, 212, 0.15) 0px, transparent 50%);
        }
        .text-glow {
            text-shadow: 0 0 20px rgba(99, 102, 241, 0.5);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-active .accordion-content {
            max-height: 240px;
        }
        .accordion-active .accordion-icon {
            transform: rotate(180deg);
        }