/* roulang page: index */
:root {
            --bg-deep: #0B0F17;
            --bg-card: #111927;
            --border-glow: rgba(14, 165, 233, 0.2);
            --laser-cyan: #0EA5E9;
            --laser-emerald: #10B981;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: #0B0F17;
            color: #E2E8F0;
            overflow-x: hidden;
            scroll-behavior: smooth;
        }
        .hero-glow-bg {
            background: linear-gradient(180deg, rgba(11, 15, 23, 0.75) 0%, rgba(11, 15, 23, 0.95) 100%), url('/assets/images/5012e4bda2252495.jpg') center/cover no-repeat;
        }
        .section-dark-alt {
            background-color: #0E1420;
        }
        .glass-panel {
            background: rgba(17, 25, 39, 0.75);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        .glass-panel-glow {
            border: 1px solid rgba(14, 165, 233, 0.3);
            box-shadow: 0 0 25px rgba(14, 165, 233, 0.08);
        }
        .tab-btn.active {
            border-bottom: 2px solid #0EA5E9;
            color: #0EA5E9;
        }