:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --danger-color: #e74c3c;
    --border-radius: 6px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--light-color);
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

h1 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 20px;
    font-size: 2.5rem;
}

p {
    text-align: center;
    margin-bottom: 20px;
    color: var(--dark-color);
}

.canvas-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 30px;
}

canvas {
    border: 2px dashed var(--primary-color);
    border-radius: var(--border-radius);
    background-color: white;
    cursor: crosshair;
    touch-action: none;
    width: 100%;
    max-width: 600px;
    height: 250px;
}

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 600px;
    margin-top: 15px;
    flex-wrap: wrap;
    gap: 15px;
}

.pen-settings, .actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn {
    padding: 10px 15px;
    background-color: #f8f9fa;
    color: var(--dark-color);
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}

.btn:hover {
    background-color: #e9ecef;
}

.btn.primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
}

.btn.primary:hover {
    background-color: #2980b9;
}

#clear-btn:hover {
    background-color: var(--danger-color);
    color: white;
    border-color: var(--danger-color);
}

label {
    font-size: 0.9rem;
    margin-right: 5px;
}

input[type="color"] {
    width: 40px;
    height: 30px;
    border: none;
    border-radius: 3px;
    cursor: pointer;
}

input[type="range"] {
    width: 80px;
}

.format-options {
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 20px;
}

.format-options h3 {
    margin-bottom: 15px;
    color: var(--dark-color);
    font-size: 1.2rem;
}

.option-group {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 15px;
    align-items: center;
}

select, input[type="text"] {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 0.9rem;
}

footer {
    text-align: center;
    margin-top: 20px;
    font-size: 0.9rem;
    color: #666;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: white;
    margin: 10% auto;
    padding: 30px;
    border-radius: var(--border-radius);
    max-width: 600px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    position: relative;
}

.close {
    position: absolute;
    right: 20px;
    top: 15px;
    font-size: 28px;
    font-weight: bold;
    color: #aaa;
    cursor: pointer;
}

.close:hover {
    color: var(--dark-color);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .actions {
        justify-content: space-between;
    }
    
    .option-group {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .option-group label {
        margin-bottom: 5px;
    }
    
    input[type="text"], select {
        width: 100%;
    }
}