/* roulang page: index */
:root {
            --primary: #00F0FF;
            --secondary: #7928CA;
            --accent: #FF4500;
            --bg-dark: #0A0D14;
            --surface: #121722;
            --card-bg: #182030;
            --text-main: #FFFFFF;
            --text-muted: #94A3B8;
            --border-glow: rgba(0, 240, 255, 0.18);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            scroll-behavior: smooth;
        }
        body {
            background-color: var(--bg-dark);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            overflow-x: hidden;
            line-height: 1.6;
        }
        .glow-border {
            border: 1px solid var(--border-glow);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.05);
            transition: all 0.3s ease;
        }
        .glow-border:hover {
            border-color: rgba(0, 240, 255, 0.45);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.18);
        }
        .btn-neon {
            background: linear-gradient(135deg, #00F0FF 0%, #0082FF 100%);
            color: #040914;
            font-weight: 700;
            transition: all 0.3s ease;
        }
        .btn-neon:hover {
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.6);
            transform: translateY(-2px);
        }
        .btn-purple {
            background: linear-gradient(135deg, #7928CA 0%, #FF0080 100%);
            color: #FFFFFF;
            font-weight: 700;
            transition: all 0.3s ease;
        }
        .btn-purple:hover {
            box-shadow: 0 0 20px rgba(121, 40, 202, 0.6);
            transform: translateY(-2px);
        }
        .hero-diagonal {
            clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-item.active .accordion-content {
            max-height: 200px;
        }
        .accordion-item.active .icon-arrow {
            transform: rotate(180deg);
        }