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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #333;
}

.container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 30px;
    max-width: 800px;
}

header {
    text-align: center;
    margin-bottom: 20px;
}

h1 {
    color: #667eea;
    font-size: 2.5em;
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.score-area {
    display: flex;
    justify-content: center;
    gap: 30px;
    font-size: 1.2em;
}

.score-item {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 10px 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.label {
    font-weight: bold;
    margin-right: 5px;
}

main {
    display: flex;
    gap: 20px;
    justify-content: center;
    align-items: flex-start;
}

.preview-area {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    min-width: 120px;
    text-align: center;
}

.preview-area h3 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.1em;
}

#previewCanvas {
    border: 2px solid #667eea;
    border-radius: 8px;
    background: #1a1a2e;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.game-wrapper {
    position: relative;
}

#gameCanvas {
    border: 3px solid #667eea;
    border-radius: 10px;
    background: #1a1a2e;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.game-over {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    min-width: 250px;
}

.game-over.hidden {
    display: none;
}

.game-over h2 {
    color: #e74c3c;
    margin-bottom: 20px;
    font-size: 2em;
}

.game-over p {
    font-size: 1.3em;
    margin-bottom: 20px;
    color: #555;
}

.new-high-score {
    color: #f39c12;
    font-weight: bold;
    font-size: 1.5em;
    margin-bottom: 20px;
    animation: pulse 1s infinite;
}

.new-high-score.hidden {
    display: none;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

.controls {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    min-width: 200px;
}

.controls h3 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.3em;
}

.controls ul {
    list-style: none;
    margin-bottom: 20px;
}

.controls li {
    padding: 8px 0;
    border-bottom: 1px solid #ddd;
    font-size: 0.95em;
}

.controls li:last-child {
    border-bottom: none;
}

button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 1.1em;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

button:active {
    transform: translateY(0);
}

.start-btn {
    width: 100%;
    margin-top: 10px;
}

#restartBtn {
    margin-top: 10px;
}

/* ビジュアルエフェクト */
@keyframes flash {
    0% {
        background-color: rgba(255, 255, 255, 0);
    }
    50% {
        background-color: rgba(255, 255, 255, 0.8);
    }
    100% {
        background-color: rgba(255, 255, 255, 0);
    }
}

.flash-effect {
    animation: flash 0.3s ease-in-out;
}

/* パーティクルエフェクト用のオーバーレイ */
.particle-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

.particle {
    position: absolute;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    animation: particle-rise 0.6s ease-out forwards;
    opacity: 1;
}

@keyframes particle-rise {
    0% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
    100% {
        opacity: 0;
        transform: translateY(-50px) scale(0.5);
    }
}