:root {
    --bg-sidebar: #1e1e2d;
    --bg-main: #f8f9fa;
    --text-primary: #e1e1e1;
    --text-muted: #a1a1a1;
    --accent: #007bff;
    --accent-hover: #0056b3;
    --border-color: #333;
    --card-bg: #fff;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-main);
    color: #333;
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar Styling */
.sidebar {
    width: 320px;
    background-color: var(--bg-sidebar);
    color: var(--text-primary);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    box-shadow: 2px 0 10px rgba(0,0,0,0.3);
    z-index: 10;
}

.sidebar-header h1 {
    font-size: 1.5rem;
    color: white;
    letter-spacing: 1px;
}

.sidebar-header p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.control-section h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 15px;
    padding-bottom: 5px;
    border-bottom: 1px solid var(--border-color);
}

.input-group {
    margin-bottom: 12px;
}

.input-group label {
    display: block;
    font-size: 0.8rem;
    margin-bottom: 5px;
}

.input-group input {
    width: 100%;
    padding: 8px;
    background: #2a2a3d;
    border: 1px solid #444;
    color: white;
    border-radius: 4px;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.button-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 20px;
}

.run-btn {
    padding: 10px;
    background-color: #3e3e5a;
    border: none;
    color: white;
    cursor: pointer;
    border-radius: 4px;
    transition: background 0.3s;
    font-weight: 600;
}

.run-btn:hover {
    background-color: var(--accent);
}

.run-btn.active {
    background-color: var(--accent);
    box-shadow: 0 0 10px rgba(0, 123, 255, 0.5);
}

.close-btn {
    width: 100%;
    padding: 10px;
    background-color: #dc3545;
    border: none;
    color: white;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
}

.close-btn:hover {
    background-color: #c82333;
}

.sidebar-footer {
    margin-top: auto;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Main Panel Styling */
.main-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 20px;
    gap: 20px;
    overflow-y: auto;
    background-color: white;
}

.plot-container {
    flex: 1;
    min-height: 250px;
    background: white;
    border: 1px solid #eee;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

/* Responsive adjustments */
@media (max-width: 900px) {
    .app-container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
    }
    .main-panel {
        height: auto;
    }
}