/* roulang page: index */
:root {
            --bg-primary: #070C1E;
            --bg-secondary: #0B132B;
            --bg-card: rgba(19, 31, 66, 0.65);
            --border-glass: rgba(72, 202, 228, 0.18);
            --text-main: #F8F9FA;
            --text-sub: #ADB5BD;
            --cyan-accent: #00F5D4;
            --cyan-glow: #00B4D8;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--bg-primary);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
        }

        .glass-panel {
            background: var(--bg-card);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glass);
            border-radius: 1rem;
        }

        .glass-panel:hover {
            border-color: rgba(0, 245, 212, 0.45);
            box-shadow: 0 10px 30px -10px rgba(0, 180, 216, 0.25);
        }

        .glow-btn {
            background: linear-gradient(135deg, #00B4D8 0%, #0077B6 100%);
            box-shadow: 0 0 22px rgba(0, 180, 216, 0.38);
            transition: all 0.25s ease;
        }

        .glow-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 30px rgba(0, 245, 212, 0.6);
            background: linear-gradient(135deg, #00F5D4 0%, #00B4D8 100%);
            color: #070C1E;
        }

        .glow-btn-alt {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(72, 202, 228, 0.4);
            transition: all 0.25s ease;
        }

        .glow-btn-alt:hover {
            border-color: var(--cyan-accent);
            background: rgba(0, 245, 212, 0.1);
            color: var(--cyan-accent);
        }

        .hero-bg {
            background-image: linear-gradient(180deg, rgba(7, 12, 30, 0.85) 0%, rgba(11, 19, 43, 0.95) 100%), url('/assets/images/57f6a53e6273e1ae.jpg');
            background-size: cover;
            background-position: center;
        }

        .section-separator {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        .accordion-content {
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
            max-height: 0;
            overflow: hidden;
        }

        .accordion-content.open {
            max-height: 500px;
            transition: max-height 0.35s ease-in-out;
        }