:root {
            --glass-bg: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.1);
            --text-main: #e0e0e0;
            --text-dim: #888;
        }

        body {
            color: var(--text-main);
            margin: 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            min-height: 100vh;
            text-shadow: 0px 2px 2px #000;
        }

        .glass-card {
            background: var(--glass-bg);
            backdrop-filter: blur(15px);
            -webkit-backdrop-filter: blur(15px);
            border: 1px solid var(--glass-border);
            border-radius: 12px;
            padding: 2.5rem;
            width: 90%;
            max-width: 700px;
            margin-top: 60px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
        }

        .glass-card h1 {
            font-weight: 300;
            letter-spacing: 4px;
            text-align: center;
            margin-bottom: 2.5rem;
            color: #fff;
        }

        .config-section,
        .quiz-section,
        .stats-section {
            display: flex;
            flex-direction: column;
            gap: 1.2rem;
        }

        .row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 15px;
            flex-wrap: wrap;
        }

        .range-picker {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }

        select,
        button,
        input[type="checkbox"] {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid var(--glass-border);
            color: #fff;
            padding: 8px 12px;
            border-radius: 4px;
            outline: none;
            cursor: pointer;
            font-size: 0.9rem;
        }

        button:hover {
            background: rgba(255, 255, 255, 0.15);
        }

        .primary-btn {
            background: #fff;
            color: #000;
            font-weight: 600;
            border: none;
            padding: 14px;
            margin-top: 10px;
            border-radius: 6px;
        }

        .primary-btn:hover {
            background: #ccc;
        }

        #question-display {
            font-size: 1.5rem;
            line-height: 1.6;
            text-align: center;
            min-height: 160px;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .hint-text {
            color: var(--text-dim);
            font-size: 0.9rem;
            text-align: center;
            height: 20px;
        }

        .hidden {
            display: none !important;
        }

        .stats-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 20px;
        }

        .stats-table td {
            padding: 12px 8px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            font-size: 0.85rem;
        }

        .tag-yes {
            color: #50fa7b;
        }

        .tag-no {
            color: #ff5555;
        }

        .progress-bar {
            font-size: 0.8rem;
            color: var(--text-dim);
            text-align: center;
            letter-spacing: 1px;
        }