body {
    font-family: 'Poppins', sans-serif;
    background: #ffffff;
    color: #000000;
    margin: 0;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    text-align: center;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(#000000 1px, transparent 0);
    background-size: 20px 20px;
    opacity: 0.1;
    z-index: -1;
}

.game-container {
    width: 100%;
    max-width: 1200px;
    padding: 2rem;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(45deg, #ff6b6b, #feca57);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1rem;
}

.card {
    background: #ffffff;
    border: 2px solid #000000;
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: 5px 5px 0px #000000;
    margin-bottom: 2rem;
}

#money-display h2 {
    font-size: 3rem;
    margin: 0.5rem 0;
}

.progress-bar-container {
    width: 100%;
    height: 10px;
    background: #e0e0e0;
    border-radius: 5px;
    margin-bottom: 1rem;
}

#progress-bar {
    height: 100%;
    width: 0;
    background: linear-gradient(45deg, #ff6b6b, #feca57);
    border-radius: 5px;
    transition: width 0.5s ease;
}

.button {
    background: linear-gradient(45deg, #ff6b6b, #feca57);
    color: white;
    border: none;
    border-radius: 10px;
    padding: 1rem 2rem;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 3px 3px 0px #000000;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-bottom: 0.5rem;
}

.button:hover {
    transform: translateY(-3px);
    box-shadow: 6px 6px 0px #000000;
}

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

.upgrade-btn {
    background: #ffffff;
    color: #000000;
    border: 2px solid #000000;
    border-radius: 15px;
    padding: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.upgrade-btn:hover {
    transform: translateY(-5px);
    box-shadow: 5px 5px 0px #000000;
}

.upgrade-btn:disabled {
    background: #cccccc;
    color: #888888;
    cursor: not-allowed;
    border-color: #cccccc;
    box-shadow: none;
    transform: none;
}

.main-layout {
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 2rem;
    align-items: start;
}

#achievements-list .achievement {
    background: #ffffff;
    border: 2px solid #000000;
    border-radius: 15px;
    padding: 1rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

#bonus-event-banner {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(45deg, #ff6b6b, #feca57);
    color: white;
    text-align: center;
    padding: 0.5rem;
    font-size: 1.2rem;
    z-index: 100;
    animation: slideIn 0.5s ease forwards;
}

@keyframes slideIn {
    from { transform: translateY(-100%); }
    to { transform: translateY(0); }
}

#visual-printer {
    position: relative;
    height: 100px;
    margin-bottom: 2rem;
}

.falling-bill {
    position: absolute;
    font-size: 1.5rem;
    color: #2f9e44;
    animation: fall 2s linear forwards;
}

@keyframes fall {
    to {
        transform: translateY(150px) rotate(360deg);
        opacity: 0;
    }
}

.back-button {
    position: absolute;
    top: 2rem;
    left: 2rem;
    text-decoration: none;
    color: #000000;
    font-weight: 600;
    font-size: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
}