:root {
    --primary: #4a6bff;
    --secondary: #ff6b6b;
    --background: #f5f7ff;
    --text: #333;
    --light: #fff;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

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

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

.game-container {
    width: 100%;
    max-width: 500px;
    text-align: center;
}

.title {
    color: var(--primary);
    margin-bottom: 30px;
    font-size: 2.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.game-card {
    background: var(--light);
    padding: 30px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

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

.instructions {
    margin-bottom: 20px;
    font-size: 1.1rem;
    color: #555;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

input {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: border 0.3s ease;
}

input:focus {
    border-color: var(--primary);
    outline: none;
}

button {
    padding: 12px 20px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

button:hover {
    background-color: #3a5bef;
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}

.result-container {
    margin-top: 20px;
    min-height: 80px;
}

.message {
    font-size: 1.2rem;
    margin-bottom: 10px;
    padding: 10px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

#newGame {
    margin-top: 20px;
    background-color: var(--secondary);
    display: none;
    width: 100%;
}

#newGame:hover {
    background-color: #ef5a5a;
}

.hidden {
    display: none !important;
}

/* Animations */
@keyframes pop {
    0% { transform: scale(0.8); opacity: 0; }
    80% { transform: scale(1.05); }
    100% { transform: scale(1); opacity: 1; }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-10px); }
    40%, 80% { transform: translateX(10px); }
}

.animate-pop {
    animation: pop 0.6s ease-out forwards;
}

.animate-fade {
    animation: fadeIn 0.8s ease-out forwards;
}

.animate-shake {
    animation: shake 0.5s ease-in-out;
}

/* Responsive Design */
@media (max-width: 600px) {
    .title {
        font-size: 2rem;
    }
    
    .game-card {
        padding: 20px;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    button {
        width: 100%;
    }
}