:root {
            --bg: #010314;
            --text: #F8FAFC;
            --text-dim: #94A3B8;
            --accent: #F59E0B;
            --accent-glow: rgba(245, 158, 11, 0.3);
            --border: rgba(245, 158, 11, 0.2);
            --card-bg: rgba(2, 5, 20, 0.75);
            --font: 'Dongle', sans-serif;
        }

        html, body {
            margin: 0;
            height: 100%;
            overflow: hidden;
            background: var(--bg);
            font-family: var(--font);
            user-select: none;
        }

        iframe {
            position: fixed;
            inset: 0;
            width: 100vw;
            height: 100vh;
            border: none;
            z-index: 0;
        }

        .nav-wrapper {
            position: fixed;
            bottom: 20px;
            left: 20px;
            z-index: 100;
        }

        .nav-active-btn {
            width: 44px;
            height: 44px;
            border-radius: 14px;
            border: 1px solid var(--accent);
            background: rgba(245, 158, 11, 0.15);
            color: var(--accent);
            cursor: pointer;
            font-size: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.25s ease;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: 0 0 16px var(--accent-glow);
            position: relative;
        }
        .nav-active-btn:hover {
            background: rgba(245, 158, 11, 0.22);
        }

        .nav-active-btn .tip {
            position: absolute;
            left: calc(100% + 14px);
            top: 50%;
            transform: translateY(-50%);
            padding: 4px 10px;
            background: rgba(1, 3, 20, 0.95);
            border: 1px solid var(--border);
            border-radius: 8px;
            color: var(--accent);
            font-size: 14px;
            font-family: var(--font);
            white-space: nowrap;
            pointer-events: none;
            letter-spacing: 0.05em;
            text-transform: uppercase;
            opacity: 0;
            transition: opacity 0.15s ease;
        }
        .nav-active-btn:hover .tip {
            opacity: 1;
        }

        /* Panel - shown/hidden via JS class */
        .nav-panel {
            position: absolute;
            bottom: 52px;
            left: 0;
            display: flex;
            flex-direction: column-reverse;
            gap: 5px;
            opacity: 0;
            transform: translateY(8px);
            pointer-events: none;
            transition: all 0.3s ease;
        }

        .nav-panel.show {
            opacity: 1;
            transform: translateY(0);
            pointer-events: all;
        }

        .nav-buttons {
            display: flex;
            flex-direction: column-reverse;
            gap: 5px;
        }

        .util-row {
            display: flex;
            flex-direction: row;
            gap: 5px;
        }

        .taskbar-btn, .util-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 12px;
            border: 1px solid var(--border);
            background: var(--card-bg);
            color: var(--text-dim);
            font-size: 15px;
            cursor: pointer;
            transition: all 0.2s ease;
            position: relative;
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            flex-shrink: 0;
        }

        .taskbar-btn:hover, .util-btn:hover {
            background: rgba(245, 158, 11, 0.12);
            border-color: var(--accent);
            color: var(--accent);
            box-shadow: 0 0 14px var(--accent-glow);
        }

        .taskbar-btn .tip, .util-btn .tip {
            position: absolute;
            left: calc(100% + 14px);
            top: 50%;
            transform: translateY(-50%);
            padding: 4px 10px;
            background: rgba(1, 3, 20, 0.95);
            border: 1px solid var(--border);
            border-radius: 8px;
            color: var(--text);
            font-size: 14px;
            font-family: var(--font);
            white-space: nowrap;
            pointer-events: none;
            letter-spacing: 0.05em;
            text-transform: uppercase;
            opacity: 0;
            transition: opacity 0.15s ease;
            z-index: 999;
        }

        .taskbar-btn:hover .tip, .util-btn:hover .tip {
            opacity: 1;
        }

        .toast {
            position: fixed;
            right: 16px;
            bottom: 16px;
            color: #010314;
            padding: .5rem 1rem;
            border-radius: 10px;
            opacity: 0;
            transform: translateY(10px);
            transition: opacity .18s ease, transform .18s ease;
            z-index: 9999;
            pointer-events: none;
            background: var(--accent);
            font-family: var(--font);
            font-size: 1.4rem;
            letter-spacing: 0.04em;
        }
        .toast.show { opacity: 1; transform: none; }

        @media (max-width: 500px) {
            .nav-wrapper { bottom: 14px; left: 14px; }
            .nav-active-btn { width: 38px; height: 38px; border-radius: 12px; }
            .taskbar-btn, .util-btn { width: 36px; height: 36px; border-radius: 10px; }
            .nav-panel { bottom: 44px; }
        }