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

body {
    font-family: 'Cal Sans', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 3rem;
    color: white;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    margin-bottom: 1rem;
}

.money-display {
    background: rgba(255,255,255,0.9);
    padding: 1rem 2rem;
    border-radius: 2rem;
    display: inline-block;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
}

#money {
    font-size: 2rem;
    font-weight: 700;
    color: #2c3e50;
}

.click-area {
    text-align: center;
    margin-bottom: 3rem;
}

.main-button {
    position: relative;
    width: 200px;
    height: 200px;
    border: none;
    border-radius: 50%;
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
    overflow: hidden;
}

.main-button:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 35px rgba(0,0,0,0.3);
}

.main-button:active {
    transform: scale(0.95);
}

.click-effect {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255,255,255,0.4);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.click-value {
    margin-top: 1rem;
    font-size: 1.2rem;
    color: white;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}

.upgrades-section, .stats-section {
    background: rgba(255,255,255,0.9);
    padding: 2rem;
    border-radius: 1rem;
    margin-bottom: 2rem;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
}

h2 {
    margin-bottom: 1.5rem;
    color: #2c3e50;
    font-size: 1.8rem;
}

.upgrades-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.upgrade-card {
    background: white;
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.upgrade-card:hover {
    transform: translateY(-5px);
}

.upgrade-card h3 {
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.upgrade-card p {
    color: #666;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.upgrade-stats {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: #666;
}

.upgrade-btn {
    width: 100%;
    padding: 0.75rem;
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.upgrade-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.upgrade-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 1rem;
    background: white;
    border-radius: 0.5rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.stat-label {
    color: #666;
}

.stat-value {
    font-weight: 600;
    color: #2c3e50;
}

.floating-numbers {
    position: fixed;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 1000;
}

.floating-number {
    position: absolute;
    font-size: 1.5rem;
    font-weight: 600;
    color: #ff6b6b;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
    animation: float-up 2s ease-out forwards;
}

@keyframes float-up {
    0% {
        opacity: 1;
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateY(-100px);
    }
}

@keyframes click-ripple {
    0% {
        width: 0;
        height: 0;
        opacity: 1;
    }
    100% {
        width: 400px;
        height: 400px;
        opacity: 0;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .main-button {
        width: 150px;
        height: 150px;
        font-size: 1.2rem;
    }
    
    .upgrades-grid {
        grid-template-columns: 1fr;
    }
}