:root {
    --primary-color: #4361ee;
    --primary-hover: #3a56d4;
    --secondary-color: #f8f9fa;
    --text-color: #2b2d42;
    --light-text: #6c757d;
    --editor-bg: #1e1e1e;
    --editor-text: #d4d4d4;
    --output-bg: #ffffff;
    --border-color: #dee2e6;
    --border-radius: 8px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f8f9fa;
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 2rem;
    font-weight: 600;
    font-size: 2.5rem;
}

.editor-area {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.editor-container, .output-container {
    flex: 1;
    min-width: 300px;
    background: var(--secondary-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 4.0rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.editor-container:hover, .output-container:hover {
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.editor-container h2, .output-container h2 {
    margin: 0 0 1rem;
    color: var(--primary-color);
    font-weight: 500;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
}

.editor-container h2::before, .output-container h2::before {
    content: "";
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--primary-color);
    margin-right: 0.75rem;
}

#code-editor {
    width: 100%;
    height: 500px;
    font-family: 'Fira Code', 'Courier New', Courier, monospace;
    font-size: 15px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    resize: none;
    background-color: var(--editor-bg);
    color: var(--editor-text);
    line-height: 1.5;
    tab-size: 4;
}

#code-editor:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.2);
}

#output {
    min-height: 500px;
    background: var(--output-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    font-family: 'Fira Code', 'Courier New', Courier, monospace;
    font-size: 15px;
    white-space: pre-wrap;
    overflow-y: auto;
    line-height: 1.5;
}

.controls {
    text-align: center;
    margin-top: 2rem;
}

button {
    padding: 0.75rem 1.75rem;
    margin: 0 0.75rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
}

button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

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

button#clear-btn {
    background: #6c757d;
}

button#clear-btn:hover {
    background: #5a6268;
}

@media (max-width: 768px) {
    .editor-area {
        flex-direction: column;
    }
    
    .container {
        padding: 1rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    #code-editor, #output {
        height: 300px;
        min-height: 300px;
    }
}

.notice {
    background-color: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 12px;
    margin-bottom: 20px;
    border-radius: 4px;
    font-size: 14px;
}
.notice a {
    color: #0056b3;
    text-decoration: underline;
}
.notice strong {
    color: #856404;
}