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

:root {
    --primary-color: #00d4ff;
    --secondary-color: #ff6b9d;
    --dark-bg: #0a0e27;
    --darker-bg: #050810;
    --card-bg: #1a1f3a;
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --success: #4ade80;
    --danger: #ff4757;
    --warning: #fbbf24;
}

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--darker-bg) 100%);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.screen {
    display: none;
    position: absolute;
    width: 100%;
    height: 100%;
    overflow-y: auto;
    animation: fadeIn 0.3s ease-in;
}

.screen.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Main Menu */
.menu-container {
    text-align: center;
    background: linear-gradient(135deg, var(--card-bg) 0%, var(--dark-bg) 100%);
    padding: 60px 40px;
    border-radius: 20px;
    border: 2px solid var(--primary-color);
    box-shadow: 0 0 40px rgba(0, 212, 255, 0.3);
    max-width: 500px;
    width: 90%;
}

.game-title {
    font-size: 4em;
    font-weight: bold;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    text-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.2em;
    margin-bottom: 40px;
    letter-spacing: 2px;
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 40px;
}

.btn {
    padding: 15px 30px;
    border: none;
    border-radius: 10px;
    font-size: 1.1em;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #00b8d4));
    color: var(--darker-bg);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.4);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--darker-bg);
}

.btn-action {
    padding: 10px 20px;
    font-size: 0.9em;
    background: var(--card-bg);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.btn-action:hover {
    background: var(--primary-color);
    color: var(--darker-bg);
}

.btn-danger {
    color: var(--danger);
    border-color: var(--danger);
}

.btn-danger:hover {
    background: var(--danger);
    color: white;
}

.icon {
    font-size: 1.2em;
}

.stats-display {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 40px;
    padding-top: 40px;
    border-top: 1px solid var(--primary-color);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.stat-item .label {
    color: var(--text-secondary);
    font-size: 0.9em;
}

.stat-item .value {
    color: var(--primary-color);
    font-size: 1.5em;
    font-weight: bold;
}

/* Game Screen */
#gameScreen {
    flex-direction: column;
    padding: 20px;
}

.game-header {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    border: 1px solid var(--primary-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.game-title-small {
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.2em;
}

.game-stats {
    display: flex;
    gap: 30px;
}

.stat {
    color: var(--text-secondary);
    font-weight: bold;
}

.stat span {
    color: var(--primary-color);
}

.game-content {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 10px;
    border: 1px solid var(--primary-color);
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.game-log {
    margin-bottom: 30px;
    min-height: 150px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.game-log-entry {
    margin-bottom: 15px;
    padding: 15px;
    background: rgba(0, 212, 255, 0.1);
    border-left: 3px solid var(--primary-color);
    border-radius: 5px;
}

.game-choices {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.choice-btn {
    padding: 12px 20px;
    background: var(--dark-bg);
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
}

.choice-btn:hover {
    background: var(--primary-color);
    color: var(--darker-bg);
    transform: translateX(5px);
}

.game-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
}

/* Achievements Screen */
#achievementsScreen {
    flex-direction: column;
    padding: 40px 20px;
}

.screen-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    width: 100%;
}

.screen-header h2 {
    color: var(--primary-color);
    font-size: 2.5em;
}

.btn-close {
    background: none;
    border: none;
    font-size: 2em;
    color: var(--text-secondary);
    cursor: pointer;
}

.btn-close:hover {
    color: var(--danger);
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
    max-width: 900px;
}

/* Engine Screen */
#engineScreen {
    background: rgba(0, 0, 0, 0.8);
}

.engine-container {
    background: linear-gradient(135deg, var(--card-bg) 0%, var(--dark-bg) 100%);
    padding: 60px;
    border-radius: 15px;
    border: 2px solid var(--primary-color);
    text-align: center;
    max-width: 500px;
}

.engine-container h2 {
    color: var(--primary-color);
    font-size: 2.5em;
    margin-bottom: 30px;
}

.engine-status {
    margin-bottom: 40px;
    color: var(--text-secondary);
}

#engineStatusText {
    font-size: 1.5em;
    font-weight: bold;
    color: var(--danger);
}

.engine-controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* Taxi Sign Screen */
#taxiSignScreen {
    background: rgba(0, 0, 0, 0.8);
}

.taxi-sign-container {
    background: linear-gradient(135deg, var(--card-bg) 0%, var(--dark-bg) 100%);
    padding: 60px;
    border-radius: 15px;
    border: 2px solid var(--primary-color);
    text-align: center;
    max-width: 500px;
}

.taxi-sign-container h2 {
    color: var(--primary-color);
    font-size: 2.5em;
    margin-bottom: 30px;
}

.taxi-sign-status {
    margin-bottom: 40px;
    color: var(--text-secondary);
}

#taxiSignStatusText {
    font-size: 1.5em;
    font-weight: bold;
    color: var(--danger);
}

.taxi-sign-controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.achievement-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    border: 2px solid var(--primary-color);
    text-align: center;
    transition: all 0.3s ease;
}

.achievement-card.locked {
    opacity: 0.5;
    border-color: var(--text-secondary);
}

.achievement-card:hover:not(.locked) {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
}

.achievement-icon {
    font-size: 2em;
    margin-bottom: 10px;
}

.achievement-card h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.achievement-card p {
    color: var(--text-secondary);
    font-size: 0.9em;
}

/* About Screen */
#aboutScreen {
    flex-direction: column;
    padding: 40px 20px;
}

.about-content {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 10px;
    border: 1px solid var(--primary-color);
    max-width: 700px;
    margin-bottom: 40px;
    max-height: 60vh;
    overflow-y: auto;
}

.about-section {
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(0, 212, 255, 0.2);
}

.about-section:last-child {
    border-bottom: none;
}

.about-section h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3em;
}

.about-section p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.about-section ul {
    color: var(--text-secondary);
    margin-left: 20px;
    line-height: 1.8;
}

/* Pause Screen */
#pauseScreen {
    background: rgba(0, 0, 0, 0.8);
}

.pause-container {
    background: var(--card-bg);
    padding: 50px;
    border-radius: 15px;
    border: 2px solid var(--primary-color);
    text-align: center;
    max-width: 400px;
}

.pause-container h2 {
    color: var(--primary-color);
    font-size: 2.5em;
    margin-bottom: 30px;
}

.pause-stats {
    margin-bottom: 30px;
    color: var(--text-secondary);
}

.pause-stats p {
    margin: 10px 0;
    font-size: 1.1em;
}

.pause-stats strong {
    color: var(--primary-color);
}

.pause-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* Game Over Screen */
#gameOverScreen {
    background: rgba(0, 0, 0, 0.9);
}

.game-over-container {
    background: linear-gradient(135deg, var(--card-bg) 0%, var(--dark-bg) 100%);
    padding: 50px;
    border-radius: 15px;
    border: 2px solid var(--secondary-color);
    text-align: center;
    max-width: 500px;
}

#gameOverTitle {
    color: var(--secondary-color);
    font-size: 3em;
    margin-bottom: 30px;
    text-shadow: 0 0 20px rgba(255, 107, 157, 0.3);
}

.game-over-stats {
    margin-bottom: 30px;
    color: var(--text-secondary);
}

.game-over-stats p {
    margin: 15px 0;
    font-size: 1.1em;
}

.game-over-stats strong {
    color: var(--primary-color);
}

#gameOverMessage {
    margin-top: 20px;
    color: var(--secondary-color);
    font-weight: bold;
    font-size: 1.2em;
}

.game-over-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--dark-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .game-title {
        font-size: 2.5em;
    }

    .menu-container {
        padding: 40px 20px;
    }

    .game-header {
        flex-direction: column;
        text-align: center;
    }

    .game-stats {
        flex-direction: column;
        gap: 10px;
    }

    .achievements-grid {
        grid-template-columns: 1fr;
    }

    .about-content {
        padding: 20px;
    }

    .pause-container,
    .game-over-container {
        max-width: 90%;
    }
}