:root {
    --primary-color: #007bff;
    --text-color: #333;
    --bg-color: #f4f4f9;
    --sidebar-bg: #fff;
    --border-color: #ddd;
}

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

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

header {
    background: var(--primary-color);
    color: white;
    padding: 1rem;
    text-align: center;
}

.main-layout {
    display: flex;
    gap: 20px;
    margin-top: 20px;
}

#sidebar {
    width: 250px;
    background: var(--sidebar-bg);
    padding: 20px;
    border: 1px solid var(--border-color);
}

#content {
    flex: 1;
    background: white;
    padding: 20px;
    border: 1px solid var(--border-color);
}

nav ul {
    list-style: none;
    padding: 0;
}

nav a {
    text-decoration: none;
    color: var(--primary-color);
    display: block;
    padding: 10px 0;
}


.interactive-sim {
    border: 2px solid #007bff;
    padding: 20px;
    background: #ffffff;
    border-radius: 12px;
    margin: 30px 0;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.2s;
}
.interactive-sim:hover {
    transform: translateY(-2px);
}
.sim-button {
    background: #28a745;
    color: white;
    border: none;
    padding: 12px 20px;
    cursor: pointer;
    border-radius: 6px;
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
.sim-output {
    font-family: 'Courier New', Courier, monospace;
    background: #1e1e1e;
    color: #00ff00;
    padding: 15px;
    border-radius: 6px;
    margin-top: 15px;
    min-height: 60px;
    border: 1px solid #000;
}


img {
    max-width: 100%;
    height: auto;
}

@media (max-width: 768px) {
    .main-layout {
        flex-direction: column;
    }
    #sidebar {
        width: 100%;
    }
    .container {
        padding: 10px;
    }
}