/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Generic hidden class */
.hidden {
    display: none !important;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #f0f0f0;
}

/* Game Container */
.game-container {
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    padding: 24px;
    max-width: 650px;
    width: 95%;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    color: #1a1a2e;
}

header h1 {
    font-size: 28px;
    font-weight: 700;
}

.score-display {
    font-size: 20px;
    font-weight: 600;
    color: #16213e;
}

#score {
    color: #00ff41;
    font-weight: 700;
}

/* Canvas Wrapper */
.canvas-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
    margin-bottom: 16px;
}

#gameCanvas {
    background: #f8f9fa;
    border-radius: 8px;
    border: 3px solid #1a1a2e;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    display: block;
    max-width: 100%;
    height: auto;
    touch-action: none;
}

/* Game Overlay */
.game-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 8px;
    transition: opacity 0.3s ease;
}

.game-overlay.hidden {
    display: flex !important; /* Override generic .hidden for smooth transition */
    opacity: 0;
    pointer-events: none;
}

.overlay-content {
    text-align: center;
    color: #ffffff;
    padding: 32px;
    max-width: 90%;
}

.overlay-content h2 {
    font-size: 36px;
    margin-bottom: 16px;
    color: #00ff41;
}

.overlay-content p {
    font-size: 18px;
    margin-bottom: 24px;
    opacity: 0.9;
}

#finalScore {
    font-size: 24px;
    font-weight: 700;
    color: #00ff41;
    margin-bottom: 24px;
}

#finalScore.hidden {
    display: none;
}

/* Button */
#startButton {
    background: linear-gradient(135deg, #00ff41 0%, #00cc34 100%);
    color: #1a1a2e;
    border: none;
    padding: 14px 32px;
    font-size: 18px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    min-width: 160px;
    min-height: 44px;
}

#startButton:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(0, 255, 65, 0.4);
}

#startButton:active {
    transform: scale(0.98);
}

/* Footer */
.controls-info {
    text-align: center;
    color: #666;
    font-size: 14px;
    margin-top: 8px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .game-container {
        padding: 16px;
    }

    header h1 {
        font-size: 22px;
    }

    .score-display {
        font-size: 18px;
    }

    .overlay-content h2 {
        font-size: 28px;
    }

    .overlay-content p {
        font-size: 16px;
    }

    #startButton {
        padding: 12px 28px;
        font-size: 16px;
    }

    .controls-info {
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    header {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    header h1 {
        font-size: 20px;
    }

    .score-display {
        font-size: 16px;
    }
}

/* Difficulty Selection */
.difficulty-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.difficulty-btn {
    background: linear-gradient(135deg, #4ecca3 0%, #3ba883 100%);
    color: #1a1a2e;
    border: none;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    min-width: 100px;
    min-height: 44px;
}

.difficulty-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(76, 204, 163, 0.4);
}

.difficulty-btn:active {
    transform: scale(0.98);
}

.difficulty-btn.selected {
    background: linear-gradient(135deg, #00ff41 0%, #00cc34 100%);
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.6);
}

/* Responsive difficulty buttons */
@media (max-width: 480px) {
    .difficulty-buttons {
        flex-direction: column;
        width: 100%;
    }

    .difficulty-btn {
        width: 100%;
    }
}

/* Leaderboard Styles */
#leaderboardSection {
    margin-top: 24px;
    max-width: 400px;
    width: 100%;
}

#leaderboardSection h3 {
    color: #4ecca3;
    margin-bottom: 12px;
    font-size: 20px;
}

.leaderboard-list {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 300px;
    overflow-y: auto;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 8px;
}

.leaderboard-entry {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    margin-bottom: 4px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
}

.leaderboard-entry:last-child {
    margin-bottom: 0;
}

.leaderboard-entry .rank {
    font-weight: 700;
    color: #00ff41;
    min-width: 30px;
}

.leaderboard-entry .score {
    font-weight: 600;
    flex: 1;
    text-align: center;
}

.leaderboard-entry .difficulty-badge {
    font-size: 12px;
    padding: 4px 8px;
    border-radius: 4px;
    background: rgba(76, 204, 163, 0.3);
    color: #4ecca3;
}

.leaderboard-entry.player-score {
    background: rgba(0, 255, 65, 0.2);
    border: 1px solid rgba(0, 255, 65, 0.4);
}

.leaderboard-empty {
    color: rgba(255, 255, 255, 0.6);
    font-style: italic;
    padding: 16px;
    text-align: center;
}

.loading-spinner {
    color: rgba(255, 255, 255, 0.7);
    font-style: italic;
    padding: 16px;
    text-align: center;
}

.error-message {
    color: #ff6b6b;
    font-size: 14px;
    padding: 12px;
    text-align: center;
}

/* Responsive leaderboard */
@media (max-width: 480px) {
    #leaderboardSection {
        margin-top: 16px;
    }

    #leaderboardSection h3 {
        font-size: 18px;
    }

    .leaderboard-list {
        max-height: 200px;
    }

    .leaderboard-entry {
        padding: 6px 10px;
    }

    .leaderboard-entry .difficulty-badge {
        font-size: 10px;
        padding: 2px 6px;
    }
}