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

html {
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #4a5f3a 0%, #6b7c59 50%, #3d4f2f 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 10px;
}

@media (min-width: 768px) {
    body {
        padding: 20px;
    }
}

.container {
    width: 100%;
    max-width: 1200px;
}

.screen {
    background: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    text-align: center;
}

@media (min-width: 768px) {
    .screen {
        border-radius: 20px;
        padding: 40px;
    }
}

.screen.hidden {
    display: none;
}

.hidden {
    display: none;
}

h1 {
    font-size: clamp(1.75rem, 5vw, 3rem);
    color: #2d3748;
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    line-height: 1.2;
}

@media (min-width: 768px) {
    h1 {
        margin-bottom: 20px;
    }
}

.subtitle {
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    color: #4a5568;
    margin-bottom: 15px;
    line-height: 1.4;
}

@media (min-width: 768px) {
    .subtitle {
        margin-bottom: 20px;
    }
}

.instructions {
    font-size: clamp(0.9rem, 2vw, 1.1rem);
    color: #718096;
    margin-bottom: 20px;
    line-height: 1.6;
}

@media (min-width: 768px) {
    .instructions {
        margin-bottom: 30px;
    }
}

.btn {
    padding: 14px 30px;
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
    min-height: 48px;
    min-width: 120px;
    touch-action: manipulation;
}

@media (min-width: 768px) {
    .btn {
        padding: 15px 40px;
    }
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

@media (hover: none) {
    .btn-primary:hover {
        transform: none;
    }
}

.credits {
    margin-top: 25px;
    font-size: clamp(0.85rem, 2vw, 0.95rem);
    color: #718096;
}

.credits p {
    margin: 0;
}

.credits a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s ease;
}

.credits a:hover {
    color: #764ba2;
    text-decoration: underline;
}

@media (min-width: 768px) {
    .credits {
        margin-top: 30px;
    }
}

/* Game Screen */
/* Countdown Bar */
.countdown-bar-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.countdown-bar {
    height: 100%;
    width: 100%;
    background: #fc8181;
    transition: width 0.1s linear;
}

.score-display {
    margin-bottom: 20px;
    font-size: clamp(1.2rem, 3vw, 1.5rem);
    color: #2d3748;
    font-weight: bold;
    user-select: none;
    -webkit-user-select: none;
}

@media (min-width: 768px) {
    .score-display {
        margin-bottom: 30px;
    }
}

#score {
    color: #667eea;
    font-size: clamp(1.5rem, 4vw, 2rem);
}

.game-question {
    font-size: clamp(1.3rem, 3.5vw, 1.8rem);
    color: #667eea;
    font-weight: bold;
    margin-bottom: 25px;
    text-align: center;
    user-select: none;
    -webkit-user-select: none;
}

@media (min-width: 768px) {
    .game-question {
        margin-bottom: 35px;
    }
}

.image-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

@media (min-width: 768px) {
    .image-container {
        gap: 30px;
    }
}

.image-option {
    flex: 1;
    min-width: 280px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

@media (min-width: 768px) {
    .image-option {
        min-width: 300px;
    }
}

.image-wrapper {
    position: relative;
    width: 100%;
    max-width: 400px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.image-wrapper:active {
    transform: scale(0.98);
}

.image-option img {
    width: 100%;
    max-width: 400px;
    height: clamp(250px, 50vw, 400px);
    object-fit: cover;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 3px solid transparent;
}

@media (min-width: 768px) {
    .image-option img {
        border-radius: 15px;
    }
}

@media (hover: hover) {
    .image-option img:hover {
        transform: scale(1.05);
        box-shadow: 0 15px 40px rgba(102, 126, 234, 0.3);
        border-color: rgba(102, 126, 234, 0.5);
    }
}

.image-option img:active {
    transform: scale(0.98);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
}

/* Tap indicator for mobile */
.tap-indicator {
    position: absolute;
    bottom: 15px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(102, 126, 234, 0.95);
    color: white;
    padding: 10px 20px;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: bold;
    pointer-events: none;
    opacity: 0;
    animation: pulse 2s ease-in-out infinite;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Show tap indicator on mobile/touch devices */
@media (hover: none) {
    .tap-indicator {
        opacity: 1;
    }
}

/* Hide tap indicator on desktop */
@media (hover: hover) {
    .tap-indicator {
        display: none;
    }
}

/* Pulse animation for tap indicator */
@keyframes pulse {
    0%, 100% {
        opacity: 0.8;
        transform: translateX(-50%) scale(1);
    }
    50% {
        opacity: 1;
        transform: translateX(-50%) scale(1.05);
    }
}


.vs-divider {
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    font-weight: bold;
    color: #667eea;
    padding: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    -webkit-user-select: none;
}

@media (min-width: 768px) {
    .vs-divider {
        padding: 20px;
    }
}

/* High Score Display on Start Screen */
.high-score-display {
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    color: #667eea;
    font-weight: bold;
    margin-bottom: 20px;
    padding: 12px 24px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 25px;
}

/* Game Over Screen */
.new-record-message {
    font-size: clamp(1.2rem, 3vw, 1.5rem);
    color: #f6ad55;
    font-weight: bold;
    margin-bottom: 20px;
    padding: 15px 30px;
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-radius: 15px;
    display: inline-block;
    animation: celebrate 0.6s ease-in-out;
    box-shadow: 0 8px 20px rgba(246, 173, 85, 0.3);
}

.trophy {
    font-size: 1.5em;
    display: inline-block;
    animation: bounce 0.5s infinite alternate;
}

@keyframes celebrate {
    0% {
        transform: scale(0.8) rotate(-5deg);
        opacity: 0;
    }
    50% {
        transform: scale(1.1) rotate(5deg);
    }
    100% {
        transform: scale(1) rotate(0deg);
        opacity: 1;
    }
}

@keyframes bounce {
    from {
        transform: translateY(0);
    }
    to {
        transform: translateY(-5px);
    }
}

.result-message {
    font-size: clamp(1.1rem, 3vw, 1.5rem);
    color: #2d3748;
    margin-bottom: 20px;
    line-height: 1.4;
}

@media (min-width: 768px) {
    .result-message {
        margin-bottom: 30px;
    }
}

#final-score {
    color: #667eea;
    font-size: clamp(2rem, 5vw, 2.5rem);
    font-weight: bold;
}

.high-score-container {
    margin: 20px 0;
}

.high-score-label {
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    color: #4a5568;
    font-weight: bold;
}

#high-score {
    color: #667eea;
    font-size: clamp(1.3rem, 3vw, 1.5rem);
}

.reveal-container {
    margin: 20px 0;
    padding: 15px;
    background: #f7fafc;
    border-radius: 10px;
    border-left: 4px solid #fc8181;
}

@media (min-width: 768px) {
    .reveal-container {
        margin: 30px 0;
        padding: 20px;
    }
}

.reveal-text {
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    color: #2d3748;
    line-height: 1.5;
}

#correct-position {
    color: #e53e3e;
    font-weight: bold;
    text-transform: uppercase;
}

/* Mobile-specific styles */
@media (max-width: 767px) {
    .image-container {
        flex-direction: column;
    }

    .vs-divider {
        transform: rotate(90deg);
        margin: 5px 0;
    }

    .image-option {
        width: 100%;
        max-width: 100%;
        min-width: unset;
    }

    .image-option img {
        max-width: 100%;
    }
}

/* Small phones */
@media (max-width: 375px) {
    .screen {
        padding: 15px;
    }

    .btn {
        font-size: 0.9rem;
        padding: 12px 20px;
    }

    .select-btn {
        font-size: 0.9rem;
        padding: 10px 20px;
    }
}

/* Tablet and larger */
@media (min-width: 768px) and (max-width: 1024px) {
    .image-option img {
        max-width: 350px;
        height: 350px;
    }
}

/* Animation for correct/wrong feedback */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.wrong-choice {
    animation: shake 0.5s;
}

.correct-choice img {
    border: 5px solid #48bb78;
}

.wrong-choice img {
    border: 5px solid #fc8181;
}