* {
    -webkit-tap-highlight-color: transparent;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    touch-action: manipulation;
    overflow: hidden;
    color: #fff;
    background-color: #000;
}

#music-toggle {
    position: fixed;
    top: 15px;
    right: 15px;
    z-index: 100;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(0,0,0,0.6);
    border: 2px solid rgba(255,255,255,0.3);
    font-size: 1.3rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    transition: background 0.3s;
}
#music-toggle:hover { background: rgba(255,255,255,0.2); }

/* Слайдер фона */
#bg-slider {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-size: cover;
    background-position: center;
    transition: background-image 2s ease-in-out; /* Плавная смена картинок */
    z-index: -1;
}

/* Главный контейнер (полупрозрачный) */
.app-container {
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Экраны */
.screen {
    display: none;
    flex-direction: column;
    width: 90%;
    max-width: 800px;
    background: rgba(30, 30, 30, 0.9);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    max-height: 92vh;
    overflow-y: auto;
}

.screen.active {
    display: flex;
}

h1, h2 { text-align: center; margin-bottom: 20px; }
p { text-align: center; margin-bottom: 30px; font-size: 1.2rem; }

/* Кнопки ответов */
.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 30px;
}

.option-btn {
    padding: 15px;
    font-size: 1.1rem;
    background-color: #3a3a3a;
    color: white;
    border: 2px solid #555;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
    min-height: 48px;
    touch-action: manipulation;
}

.option-btn:hover { background-color: #555; }
.option-btn.selected { border-color: #4CAF50; background-color: #2e5930; }

/* Навигация */
.nav-buttons, .confirm-buttons {
    display: flex;
    justify-content: space-between;
    gap: 10px;
}

button {
    padding: 12px 20px;
    font-size: 1rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
    min-height: 44px;
    touch-action: manipulation;
}

.primary-btn { background-color: #007bff; color: white; width: 100%; font-weight: bold; }
.primary-btn:hover { background-color: #0056b3; }
.secondary-btn { background-color: #6c757d; color: white; flex: 1; min-width: 80px;}
.secondary-btn:hover { background-color: #5a6268; }
.danger-btn { background-color: #dc3545; color: white; flex: 1; min-width: 80px;}
.danger-btn:hover { background-color: #c82333; }

/* Экран результатов */
.score-display {
    font-size: 4rem;
    text-align: center;
    font-weight: bold;
    color: #4CAF50;
    margin-bottom: 20px;
}

.results-scroll-box {
    max-height: 60vh;
    overflow-y: auto;
    padding-right: 15px;
}

.result-item {
    background: #2a2a2a;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
}

.result-item h3 { font-size: 1.1rem; margin-bottom: 10px; text-align: left; }
.answer-wrong { color: #ff6b6b; font-weight: bold; }
.answer-correct { color: #4CAF50; font-weight: bold; }
.quote-box {
    background: #1a1a1a;
    padding: 10px;
    border-left: 4px solid #007bff;
    margin-top: 10px;
    font-style: italic;
    font-size: 0.95rem;
    color: #ccc;
}

@media (max-width: 500px) {
    .screen {
        padding: 20px 15px;
        width: 95%;
    }
    .options-grid {
        grid-template-columns: 1fr;
    }
    .nav-buttons {
        flex-direction: column;
    }
    .nav-buttons .secondary-btn,
    .nav-buttons .danger-btn {
        flex: unset;
        width: 100%;
    }
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.2rem; }
    .score-display { font-size: 3rem; }
}