:root {
    --bg-dark: #121212;
    --bg-darker: #0a0a0a;
    --text-primary: #ffffff;
    --text-secondary: rgb(120, 194, 110);
    --accent-green: #4CAF50;
    --accent-green-dark: #388E3C;
    --accent-green-light: #7bd97f;
    --card-bg: #1E1E1E;
    --card-border: #333;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    margin: 35px 0px 35px 0px;
}

.container {
    width: 100%;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
}

h1, h2, h3 {
    color: var(--accent-green);
    margin-bottom: 15px;
    text-align: center;
}

h2 {
    color: var(--text-primary);
}

h3 {
    color: var(--text-secondary);
    font-size: 1rem;
}

h4 {
    color: var(--text-secondary);
    text-align: center;
    font-size: 1.3rem;
    margin-top: 10px;
}

p {
    color: var(--text-primary);
    margin-bottom: 10px;
    text-align: center;
    font-size: 1.1rem;
}

button {
    background-color: var(--accent-green-dark);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.3s;
    margin: 10px;
}

button:hover {
    background-color: var(--accent-green-dark);
    transform: translateY(-2px);
}

button:active {
    background-color: var(--accent-green);
    transform: scale(0.98);
}

button:disabled {
    background-color: #555;
    cursor: not-allowed;
    transform: none;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    transition: all 0.3s;
    cursor: pointer;
    width: 250px;
    margin: 10px;
    text-align: center;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.4);
}

.card:active {
    transform: scale(0.98);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.card.selected {
    border: 2px solid var(--accent-green);
    box-shadow: 0 0 15px rgba(76, 175, 80, 0.5);
}

/* Card Layouts */
.card-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
    margin: 20px 0;
}

.card-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
    margin: 20px 0;
}

/* Button Containers */
.button-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
    margin: 20px 0;
}

.hidden {
    display: none;
}

.loading {
    color: var(--accent-green);
    text-align: center;
    margin: 20px 0;
    font-size: 1.2rem;
}

#score-display {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--card-bg);
    padding: 10px 20px;
    border-radius: 5px;
    border: 1px solid var(--card-border);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    font-weight: bold;
    color: var(--accent-green-light);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .card {
        width: calc(60% - 0px);
    }
    
    button {
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 480px) {
    .card {
        width: 100%;
        max-width: 300px;
    }
    
    body {
        padding: 10px;
    }
    
    .container {
        padding: 10px;
    }
}