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

:root {
    --primary-color: #4a90e2;
    --secondary-color: #50c878;
    --danger-color: #e74c3c;
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-color: #2c3e50;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 12px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-color);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
    position: fixed;
}

.screen {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    top: 0;
    left: 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.screen.hidden {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.95);
}

/* Экран старта */
.start-content {
    text-align: center;
    background: var(--card-bg);
    padding: 3rem 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow-hover);
    max-width: 400px;
    width: 90%;
}

.start-content h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.high-score {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: var(--text-color);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 1rem 2.5rem;
    font-size: 1.2rem;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    font-weight: 600;
    box-shadow: var(--shadow);
}

.btn-primary:active {
    transform: scale(0.95);
}

.btn-primary:hover {
    box-shadow: var(--shadow-hover);
}

/* Игровой экран */
#game-screen {
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
}

.info-panel {
    display: flex;
    justify-content: space-around;
    width: 100%;
    max-width: 600px;
    background: rgba(255, 255, 255, 0.95);
    padding: 1rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.info-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.info-label {
    font-size: 0.9rem;
    color: #666;
    font-weight: 500;
}

.info-item span:last-child {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

#timer-display {
    color: var(--danger-color);
}

.game-board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(4, 1fr);
    gap: 0.75rem;
    width: 100%;
    max-width: 400px;
    aspect-ratio: 3/4;
    padding: 0.5rem;
}

.card {
    position: relative;
    width: 100%;
    height: 100%;
    cursor: pointer;
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.2s ease;
}

.card.flipped .card-front {
    opacity: 0;
    pointer-events: none;
}

.card.flipped .card-back {
    opacity: 1;
    pointer-events: auto;
}

.card.matched {
    opacity: 0.6;
    pointer-events: none;
}

.card-front,
.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 12px;
    box-shadow: var(--shadow);
    top: 0;
    left: 0;
    transition: opacity 0.3s ease;
}

.card-front {
    background: linear-gradient(135deg, #50c878 0%, #2ecc71 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 1;
    z-index: 2;
}

.card-back {
    background: var(--card-bg);
    overflow: hidden;
    display: block;
    position: relative;
    opacity: 0;
    z-index: 1;
}

.card-back img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    pointer-events: none;
}

.card:active:not(.flipped):not(.matched) {
    opacity: 0.9;
}

.card.matched .card-back {
    border: 3px solid var(--secondary-color);
    box-shadow: 0 0 20px rgba(80, 200, 120, 0.5);
}

/* Экран завершения игры */
.game-over-content {
    background: var(--card-bg);
    padding: 2.5rem 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow-hover);
    max-width: 450px;
    width: 90%;
    text-align: center;
    animation: slideIn 0.5s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.game-over-content h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.score-breakdown {
    margin: 2rem 0;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.score-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: #f8f9fa;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.score-item.total {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-weight: 700;
    font-size: 1.2rem;
    margin-top: 0.5rem;
}

.score-label {
    font-size: 1rem;
}

.score-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
    animation: countUp 0.8s ease;
}

.score-item.total .score-value {
    color: white;
}

@keyframes countUp {
    from {
        opacity: 0;
        transform: scale(0.5);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.high-score-result {
    margin: 1.5rem 0;
    font-size: 1.1rem;
}

#new-record {
    display: block;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    animation: bounce 0.6s ease;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Адаптивность для мобильных устройств */
@media (max-width: 768px) {
    .game-board {
        gap: 0.5rem;
        padding: 0.25rem;
    }

    .info-panel {
        padding: 0.75rem;
    }

    .info-item span:last-child {
        font-size: 1.2rem;
    }

    .start-content h1 {
        font-size: 2rem;
    }
}

/* Анимация для несовпадения */
.card.mismatch {
    animation: shake 0.5s;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}