@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&display=swap');

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

body {
    font-family: 'Orbitron', sans-serif;
    overflow: hidden;
    background: #000;
    color: #fff;
}

#canvas {
    position: fixed;
    top: 0;
    left: 0;
    cursor: pointer;
    touch-action: none;
}

#ui-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

#ui-overlay > * {
    pointer-events: auto;
}

/* Top Stats Bar */
#top-stats {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 30px;
    background: rgba(0, 0, 0, 0.7);
    padding: 15px 30px;
    border-radius: 15px;
    border: 2px solid rgba(0, 255, 255, 0.5);
    box-shadow: 0 0 30px rgba(0, 255, 255, 0.3);
}

.stat-item {
    text-align: center;
}

.stat-label {
    font-size: 10px;
    opacity: 0.7;
    letter-spacing: 2px;
}

.stat-value {
    font-size: 24px;
    font-weight: 900;
    color: #00ffff;
    text-shadow: 0 0 10px #00ffff;
    margin-top: 5px;
}

.combo-display {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.combo-bar-container {
    width: 100px;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    margin-top: 5px;
    overflow: hidden;
}

.combo-bar {
    height: 100%;
    background: #00ffff;
    transition: width 0.05s linear;
    box-shadow: 0 0 10px currentColor;
}

/* Health Bar */
#health-container {
    position: absolute;
    top: 120px;
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    max-width: 80%;
}

.health-bar-bg {
    width: 100%;
    height: 20px;
    background: rgba(0, 0, 0, 0.7);
    border-radius: 10px;
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.health-bar {
    height: 100%;
    background: linear-gradient(90deg, #ff0000, #ff00ff, #00ffff);
    transition: width 0.2s ease-out;
    box-shadow: 0 0 20px #ff00ff;
}

.health-text {
    text-align: center;
    margin-top: 5px;
    font-size: 14px;
    text-shadow: 0 0 10px #fff;
}

/* Upgrade Panel */
#upgrade-panel {
    position: absolute;
    bottom: 100px;
    right: 20px;
    width: 300px;
    background: rgba(0, 0, 0, 0.8);
    padding: 20px;
    border-radius: 15px;
    border: 2px solid rgba(255, 255, 0, 0.5);
    box-shadow: 0 0 30px rgba(255, 255, 0, 0.3);
}

.upgrade-title {
    text-align: center;
    font-size: 16px;
    font-weight: 900;
    margin-bottom: 15px;
    color: #ffff00;
    text-shadow: 0 0 10px #ffff00;
}

.upgrade-btn {
    width: 100%;
    background: rgba(0, 0, 0, 0.5);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    padding: 12px;
    margin-bottom: 10px;
    cursor: pointer;
    color: #fff;
    font-family: 'Orbitron', sans-serif;
    transition: all 0.3s;
}

.upgrade-btn:hover {
    transform: scale(1.05);
    border-color: rgba(255, 255, 255, 0.6);
}

.upgrade-btn.affordable {
    border-color: #ffff00;
    box-shadow: 0 0 20px rgba(255, 255, 0, 0.5);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.upgrade-name {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 5px;
}

.upgrade-info {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    opacity: 0.8;
}

/* Stats Panel */
#stats-panel {
    position: absolute;
    bottom: 100px;
    left: 20px;
    width: 250px;
    background: rgba(0, 0, 0, 0.8);
    padding: 20px;
    border-radius: 15px;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.stats-content {
    font-size: 14px;
}

.stats-row {
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
}

.stats-row span {
    color: #00ffff;
    font-weight: 700;
    text-shadow: 0 0 5px #00ffff;
}

/* Achievement Popup */
.achievement {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    background: rgba(0, 0, 0, 0.95);
    padding: 30px 40px;
    border-radius: 20px;
    border: 3px solid #ffff00;
    box-shadow: 0 0 50px rgba(255, 255, 0, 0.8);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 1000;
}

.achievement.show {
    transform: translate(-50%, -50%) scale(1);
}

.achievement.hidden {
    display: none;
}

.achievement-icon {
    font-size: 48px;
}

.achievement-title {
    font-size: 20px;
    font-weight: 900;
    color: #ffff00;
    text-shadow: 0 0 10px #ffff00;
    margin-bottom: 5px;
}

.achievement-desc {
    font-size: 14px;
    opacity: 0.8;
}

/* Footer */
#footer {
    position: fixed;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 12px;
    opacity: 0.5;
    pointer-events: auto;
}

#footer a {
    color: #00ffff;
    text-decoration: none;
}

#footer a:hover {
    text-shadow: 0 0 10px #00ffff;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    #top-stats {
        gap: 15px;
        padding: 10px 15px;
        font-size: 12px;
    }
    
    .stat-value {
        font-size: 18px;
    }
    
    #upgrade-panel,
    #stats-panel {
        width: calc(50% - 15px);
        padding: 15px;
        font-size: 12px;
        bottom: 60px;
    }
    
    .upgrade-btn {
        padding: 8px;
        font-size: 11px;
    }
    
    .stats-row {
        font-size: 11px;
    }
    
    #footer {
        font-size: 10px;
    }
}

@media (max-width: 480px) {
    #top-stats {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    #upgrade-panel,
    #stats-panel {
        width: calc(100% - 20px);
        left: 10px;
        right: 10px;
        bottom: auto;
    }
    
    #upgrade-panel {
        top: auto;
        bottom: 60px;
    }
    
    #stats-panel {
        top: 180px;
        bottom: auto;
    }
}