:root {
    --bg-color: #f4f4f9;
    --text-color: #333;
    --accent-color: #2a5298; /* Azul vibrante */
    --code-bg: #2d2d2d;
    --code-text: #f8f8f2;
    --highlight-bg: #44475a;
    --card-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: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 2rem 0;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

h2, h3 {
    color: var(--accent-color);
}

.code-explorer {
    display: flex;
    gap: 20px;
    margin-top: 2rem;
    height: 70vh; /* Altura fija para scroll */
}

.code-block {
    flex: 3;
    background-color: var(--code-bg);
    border-radius: 8px;
    padding: 0;
    overflow: hidden;
    color: var(--code-text);
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
}

.code-block h3 {
    background: #1e1e1e;
    color: #fff;
    margin: 0;
    padding: 10px 15px;
    font-size: 1rem;
    border-bottom: 1px solid #444;
}

pre {
    margin: 0;
    padding: 15px;
    overflow: auto;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 14px;
    height: 100%;
}

.code-line {
    display: block;
    padding: 2px 5px;
    cursor: pointer;
    border-radius: 3px;
    transition: background-color 0.2s;
}

.code-line:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.code-line.active {
    background-color: var(--highlight-bg);
    border-left: 3px solid #bd93f9; 
}

.comment { color: #6272a4; font-style: italic; }
.keyword { color: #ff79c6; font-weight: bold; }
.string { color: #f1fa8c; }
.function { color: #50fa7b; }
.number { color: #bd93f9; }
.type { color: #8be9fd; font-style: italic; }

.explanation-panel {
    flex: 2;
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--card-shadow);
    overflow-y: auto;
    border-left: 5px solid var(--accent-color);
}

.concept-box {
    margin-top: 20px;
    padding: 15px;
    background-color: #e3f2fd;
    border-radius: 5px;
    border: 1px solid #bbdefb;
}

.concept-box h4 {
    margin-top: 0;
    color: #1565c0;
}

footer {
    text-align: center;
    padding: 2rem;
    margin-top: 2rem;
    background-color: #e9ecef;
    color: #666;
}

/* Responsive */
@media (max-width: 768px) {
    .code-explorer {
        flex-direction: column;
        height: auto;
    }
    
    .code-block, .explanation-panel {
        height: 400px; 
    }
}