/* roulang page: index */
:root {
            --bg-base: #0B0F19;
            --bg-secondary: #111827;
            --bg-glass: rgba(17, 24, 39, 0.72);
            --color-primary: #2563EB;
            --color-accent: #00F2FE;
            --color-purple: #7C3AED;
            --border-glass: rgba(255, 255, 255, 0.08);
            --border-glow: rgba(0, 242, 254, 0.35);
            --text-head: #F9FAFB;
            --text-body: #9CA3AF;
            --text-muted: #6B7280;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--bg-base);
            color: var(--text-body);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            overflow-x: hidden;
            line-height: 1.7;
        }

        /* Glassmorphism Classes */
        .glass-panel {
            background: var(--bg-glass);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-glass);
            box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
        }

        .glass-card {
            background: rgba(17, 24, 39, 0.65);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .glass-card:hover {
            transform: translateY(-4px);
            border-color: var(--border-glow);
            box-shadow: 0 12px 36px 0 rgba(0, 242, 254, 0.15);
        }

        /* Gradient & Glow Buttons */
        .btn-luminous {
            background: linear-gradient(135deg, #2563EB 0%, #00F2FE 100%);
            color: #ffffff;
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: 0 0 15px rgba(0, 242, 254, 0.25);
        }

        .btn-luminous:hover {
            filter: drop-shadow(0 0 14px rgba(0, 242, 254, 0.55));
            transform: translateY(-1px);
        }

        .btn-ghost-glow {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: #F9FAFB;
            transition: all 0.3s ease;
        }

        .btn-ghost-glow:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.4);
            transform: translateY(-1px);
        }

        .text-glow {
            text-shadow: 0 0 18px rgba(0, 242, 254, 0.35);
        }

        /* Section Spacing & Alternation */
        .section-padding {
            padding-top: 5.5rem;
            padding-bottom: 5.5rem;
        }

        @media (max-width: 768px) {
            .section-padding {
                padding-top: 3.5rem;
                padding-bottom: 3.5rem;
            }
        }

        /* Form Inputs */
        .input-tech {
            background: rgba(11, 15, 25, 0.8);
            border: 1px solid var(--border-glass);
            color: #F9FAFB;
            transition: all 0.25s ease;
        }

        .input-tech:focus {
            outline: none;
            border-color: var(--color-accent);
            box-shadow: 0 0 12px rgba(0, 242, 254, 0.25);
        }

        /* Custom Accordion Chevron */
        details[open] summary svg {
            transform: rotate(180deg);
        }