/* roulang page: index */
:root {
            --bg-main: #0D0F12;
            --bg-card: #16191E;
            --accent-green: #00FF87;
            --accent-cyan: #00F0FF;
            --border-dim: rgba(255, 255, 255, 0.08);
            --text-sub: #8A939E;
        }
        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            background-color: var(--bg-main);
            color: #FFFFFF;
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
        }
        .grid-bg {
            background-size: 40px 40px;
            background-image: 
                linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
        }
        .tech-border {
            border: 1px solid var(--border-dim);
            transition: border-color 0.25s ease, transform 0.25s ease;
        }
        .tech-border:hover {
            border-color: rgba(0, 255, 135, 0.35);
        }
        .tech-badge {
            font-size: 11px;
            letter-spacing: 0.15em;
            text-transform: uppercase;
        }
        .glow-line {
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(0, 240, 255, 0.4), transparent);
        }