body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f4f7f9;
}

header {
    background-color: #2c3e50;
    color: white;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    text-align: center;
}

header h1 {
    margin: 0;
}

.main-nav {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.main-nav h2 {
    color: #e67e22;
    border-bottom: 2px solid #e67e22;
    padding-bottom: 0.5rem;
}

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

.main-nav li {
    margin-bottom: 0.5rem;
}

.main-nav a {
    text-decoration: none;
    color: #2980b9;
    padding: 0.3rem 0.5rem;
    display: block;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.main-nav a:hover {
    background-color: #ecf0f1;
}

footer {
    text-align: center;
    margin-top: 2rem;
    padding: 1rem;
    color: #777;
    border-top: 1px solid #ddd;
}

/* Styles for individual tool pages */
.tool-page {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.control-panel {
    background: #ecf0f1;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: flex-end;
}

.control-group {
    display: flex;
    flex-direction: column;
    min-width: 150px;
}

.control-group label {
    font-weight: bold;
    margin-bottom: 0.3rem;
    color: #2c3e50;
}

.control-group input[type="range"],
.control-group input[type="number"],
.control-group select {
    padding: 0.5rem;
    border: 1px solid #bdc3c7;
    border-radius: 4px;
}

.plot-container {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-top: 2rem;
    justify-content: center;
}

.plot-card {
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 1rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    flex: 1 1 400px;
}

.plot-card h3 {
    margin-top: 0;
    color: #16a085;
    border-bottom: 1px solid #eee;
    padding-bottom: 0.5rem;
}

.plot-canvas {
    width: 100%;
    height: auto;
    border: 1px solid #ccc;
    background-color: #fafafa;
    display: block;
    cursor: crosshair;
}

.info-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid #ecf0f1;
}

.info-card {
    background: #f9f9f9;
    padding: 1.5rem;
    border-radius: 8px;
}

.info-card h3 {
    margin-top: 0;
    color: #e67e22;
}

.equation {
    font-family: 'Courier New', monospace;
    background: #2c3e50;
    color: #ecf0f1;
    padding: 1rem;
    border-radius: 5px;
    overflow-x: auto;
    font-size: 1.1rem;
    text-align: center;
}

.interview-question {
    background: #fff3e0;
    border-left: 5px solid #ff9800;
    padding: 1rem;
    margin: 1rem 0;
    font-style: italic;
}

.back-link {
    display: inline-block;
    margin-bottom: 1rem;
    padding: 0.5rem 1rem;
    background: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 4px;
}
.back-link:hover {
    background: #2980b9;
}