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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    background: white;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    width: 500px;
    min-height: 600px;
    overflow: hidden;
}

.header {
    background: #e5ddd5;
    padding: 30px;
    text-align: center;
}

.header h1 {
    font-size: 2.5em;
    color: #7469b6;
    margin-bottom: 10px;
    font-weight: bold;
}

.header p {
    font-size: 1.2em;
    color: #333;
    font-weight: bold;
}

.game-area {
    background: #c7c8cc;
    padding: 30px;
    min-height: 400px;
}

.controls {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
}

.btn {
    padding: 10px 20px;
    border: 2px solid #666;
    background: #f0f0f0;
    border-radius: 5px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn:hover {
    background: #e0e0e0;
    transform: translateY(-2px);
}

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

.input-area {
    text-align: center;
    margin-bottom: 20px;
}

#numberInput {
    width: 200px;
    height: 50px;
    font-size: 20px;
    text-align: center;
    border: 2px solid #333;
    border-radius: 5px;
    background: #000;
    color: #00ff00;
    margin-bottom: 15px;
}

#numberInput:focus {
    outline: none;
    border-color: #7469b6;
}

.submit-btn, .continue-btn {
    margin: 5px;
    padding: 8px 15px;
}

.status {
    text-align: center;
    margin-bottom: 20px;
}

.status p {
    font-size: 18px;
    color: #451952;
    font-weight: bold;
}

.result {
    background: white;
    border: 4px solid #ccc;
    border-radius: 5px;
    padding: 20px;
    text-align: center;
    font-size: 18px;
    font-weight: bold;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result.success {
    border-color: #4CAF50;
    color: #4CAF50;
}

.result.error {
    border-color: #f44336;
    color: #f44336;
}

.result.info {
    border-color: #2196F3;
    color: #2196F3;
}

.footer {
    background: white;
    padding: 15px;
    text-align: center;
    font-size: 10px;
    color: #666;
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: #fefefe;
    margin: 5% auto;
    padding: 20px;
    border-radius: 10px;
    width: 80%;
    max-width: 600px;
    position: relative;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: #000;
}

.help-text {
    margin-top: 20px;
    line-height: 1.6;
}

.help-text ul {
    margin-left: 20px;
}

.help-text li {
    margin-bottom: 10px;
}

@media (max-width: 600px) {
    .container {
        width: 95%;
        margin: 10px;
    }
    
    .controls {
        flex-direction: column;
        gap: 10px;
    }
    
    .btn {
        width: 100%;
    }
}