* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.game-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 40px;
    max-width: 800px;
    width: 100%;
    text-align: center;
    backdrop-filter: blur(10px);
}

/* PWA Specific Styles */
.pwa-status {
    position: fixed;
    top: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 8px 12px;
    border-radius: 20px;
    font-size: 0.8em;
    z-index: 1000;
}

.install-prompt {
    background: linear-gradient(45deg, #27ae60, #229954);
    color: white;
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 12px;
    display: none;
    align-items: center;
    justify-content: space-between;
}

.install-btn {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid white;
    color: white;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s;
}

.install-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.offline-indicator { background: #e74c3c; }
.online-indicator { background: #27ae60; }

/* Game Styles */
.header { margin-bottom: 30px; }

.title {
    font-size: 2.5em;
    color: #2c3e50;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.score-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
    font-size: 1.2em;
    font-weight: 600;
}

        .question-container {
            background: #f8f9fa;
            border-radius: 15px;
            padding: 30px;
            margin-bottom: 30px;
            box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
        }

        .question {
            font-size: 1.4em;
            color: #2c3e50;
            margin-bottom: 25px;
            line-height: 1.5;
        }

        .options {
            display: grid;
            gap: 15px;
            margin-bottom: 20px;
        }

        .option {
            background: linear-gradient(45deg, #3498db, #2980b9);
            color: white;
            border: none;
            padding: 15px 25px;
            border-radius: 12px;
            font-size: 1.1em;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
        }

        .option:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
        }

        .option.correct {
            background: linear-gradient(45deg, #27ae60, #229954);
            box-shadow: 0 4px 15px rgba(39, 174, 96, 0.3);
        }

        .option.incorrect {
            background: linear-gradient(45deg, #e74c3c, #c0392b);
            box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
        }

        .option:disabled {
            cursor: not-allowed;
            opacity: 0.7;
        }

        .next-btn {
            background: linear-gradient(45deg, #8e44ad, #9b59b6);
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 12px;
            font-size: 1.2em;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(142, 68, 173, 0.3);
        }

        .next-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(142, 68, 173, 0.4);
        }

        .next-btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none;
        }

        .explanation {
            background: #e8f5e8;
            border-left: 4px solid #27ae60;
            padding: 15px;
            margin: 20px 0;
            border-radius: 8px;
            text-align: left;
            font-style: italic;
        }

        .final-score {
            font-size: 2em;
            color: #2c3e50;
            margin-bottom: 20px;
        }

        .restart-btn {
            background: linear-gradient(45deg, #f39c12, #e67e22);
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 12px;
            font-size: 1.2em;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(243, 156, 18, 0.3);
        }

        .restart-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(243, 156, 18, 0.4);
        }

        .category-badge {
            display: inline-block;
            background: rgba(52, 152, 219, 0.1);
            color: #3498db;
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.9em;
            margin-bottom: 15px;
            font-weight: 600;
        }

        .offline-indicator {
            background: #e74c3c;
        }

        .online-indicator {
            background: #27ae60;
        }

        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }

        .pulse {
            animation: pulse 0.6s ease-in-out;
        }

@media (max-width: 768px) {
    .game-container {
        padding: 20px;
        margin: 10px;
    }

    .title { font-size: 2em; }
    .question { font-size: 1.2em; }
}