/* roulang page: index */
:root {
            --bg-main: #0D0F12;
            --bg-card: #161A20;
            --bg-elevated: #1F242D;
            --primary: #00F59B;
            --secondary: #E2B873;
            --text-main: #FFFFFF;
            --text-sub: #8E95A5;
            --border-line: rgba(255, 255, 255, 0.08);
            --glow: 0 0 20px rgba(0, 245, 155, 0.25);
        }

        html {
            scroll-behavior: smooth;
            background-color: var(--bg-main);
            color: var(--text-main);
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
        }

        body {
            overflow-x: hidden;
        }

        .btn-glow {
            transition: all 0.25s ease-in-out;
        }
        .btn-glow:hover {
            transform: translateY(-2px);
            box-shadow: var(--glow);
        }

        .card-border {
            border: 1px solid var(--border-line);
            transition: all 0.3s ease;
        }
        .card-border:hover {
            border-color: rgba(0, 245, 155, 0.4);
            transform: translateY(-2px);
        }

        .hero-bg {
            background-image: linear-gradient(to bottom, rgba(13, 15, 18, 0.75), rgba(13, 15, 18, 0.95)), url('/assets/images/6f693781a003078d.png');
            background-size: cover;
            background-position: center;
        }

        .accent-banner {
            background-image: linear-gradient(135deg, rgba(22, 26, 32, 0.95), rgba(13, 15, 18, 0.98)), url('/assets/images/7ac0740dec3dc660.webp');
            background-size: cover;
            background-position: center;
        }

        details > summary {
            list-style: none;
        }
        details > summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary .arrow-icon {
            transform: rotate(180deg);
        }