/* Global Styles */
:root {
    /* Color palette */
    --color-primary: #007BFF;
    --color-secondary: #6C757D;
    --color-accent: #28A745;
    --color-background: #F8F9FA;
    --color-panel: #FFFFFF;
    --color-border: #E0E0E0;
    --color-text-primary: #212529;
    --color-text-secondary: #6C757D;

    /* Typography */
    --font-family-sans: 'Roboto', Arial, sans-serif;

    /* Spacing */
    --spacing-small: 8px;
    --spacing-medium: 16px;
    --spacing-large: 24px;

    /* Shadows */
    --shadow-light: 0 2px 6px rgba(0, 0, 0, 0.1);
}

body {
    margin: 0;
    font-family: var(--font-family-sans);
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text-primary);
    background-color: var(--color-background);
}

/* Header */
.header {
    background-color: var(--color-primary);
    color: #FFFFFF;
    padding: var(--spacing-medium);
    text-align: center;
    font-size: 1.5rem;
    font-weight: bold;
}

/* Dashboard Layout */
.dashboard {
    display: grid;
    grid-template-columns: 1fr 3fr 1fr;
    grid-template-rows: auto;
    gap: var(--spacing-large);
    padding: var(--spacing-large);
    box-sizing: border-box;
}

/* Sidebar Filters */
.filters {
    background-color: var(--color-panel);
    padding: var(--spacing-medium);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    box-shadow: var(--shadow-light);
}

.filters section {
    margin-bottom: var(--spacing-medium);
}

.filters label {
    display: block;
    font-weight: bold;
    margin-bottom: var(--spacing-small);
    color: var(--color-text-primary);
}

.filters input {
    width: 100%;
    padding: var(--spacing-small);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.filters input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.filters input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    background-color: transparent;
}

.filters input[type="range"]::-webkit-slider-runnable-track {
    height: 4px;
    background: var(--color-primary);
    border-radius: 10px;
}

.filters input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: background-color 0.3s;
}

.filters input[type="range"]:hover::-webkit-slider-thumb {
    background-color: var(--color-accent);
}

.filters button {
    background-color: var(--color-primary);
    color: #FFFFFF;
    border: none;
    padding: var(--spacing-small);
    font-size: 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.filters button:hover {
    background-color: var(--color-accent);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Main Timeline Visualization */
.timeline-section {
    background-color: var(--color-panel);
    padding: var(--spacing-medium);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    box-shadow: var(--shadow-light);
    display: flex;
    justify-content: center;
    align-items: center;
}

#timeline {
    display: block;
    max-width: 100%;
    border: 1px solid var(--color-border);
}

/* Contextual Details Panel */
.context-panel {
    background-color: var(--color-panel);
    padding: var(--spacing-medium);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    box-shadow: var(--shadow-light);
}

.context-panel h2 {
    margin-top: 0;
    margin-bottom: var(--spacing-medium);
    color: var(--color-text-primary);
    font-size: 1.25rem;
}

#context-details {
    color: var(--color-text-secondary);
    line-height: 1.4;
    margin-top: var(--spacing-small);
}

/* Utilities */
.hidden {
    display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .dashboard {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
    }

    .filters,
    .context-panel {
        border: none;
        box-shadow: none;
        margin: var(--spacing-medium) 0;
    }
}