/* roulang page: index */
:root {
            --primary: #0A4D68;
            --primary-dark: #053B50;
            --accent: #088395;
            --accent-light: #05BFDB;
            --dark: #08101E;
            --light-bg: #F4F7F9;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: #1E293B;
            background-color: #FFFFFF;
            line-height: 1.65;
        }
        .hero-overlay {
            background: linear-gradient(135deg, rgba(8, 16, 30, 0.92) 0%, rgba(10, 77, 104, 0.85) 60%, rgba(8, 131, 149, 0.75) 100%);
        }
        .glass-panel {
            background: rgba(255, 255, 255, 0.08);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.15);
        }
        .accordion-content {
            transition: max-height 0.3s ease-out, opacity 0.3s ease;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .accordion-content.active {
            max-height: 200px;
            opacity: 1;
        }
        .tech-grid-border {
            border-color: rgba(10, 77, 104, 0.15);
        }