:root {
    --primary-color: #4F46E5;
    --secondary-color: #6B7280;
    --background-color: #F3F4F6;
    --sidebar-bg: #1F2937;
    --content-bg: #FFFFFF;
    --text-light: #F9FAFB;
    --text-dark: #111827;
    --border-color: #D1D5DB;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
}

body, html {
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--background-color);
    color: var(--text-dark);
}

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

.sidebar {
    width: 250px;
    background-color: var(--sidebar-bg);
    color: var(--text-light);
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.sidebar-header h2 {
    margin: 0;
    font-size: 1.5rem;
    text-align: center;
    padding-bottom: 20px;
    border-bottom: 1px solid #374151;
}

.sidebar ul {
    list-style: none;
    padding: 20px 0;
    margin: 0;
}

.sidebar ul li a {
    display: block;
    color: var(--text-light);
    text-decoration: none;
    padding: 12px 15px;
    border-radius: 6px;
    margin-bottom: 8px;
    transition: background-color 0.2s ease;
}

.sidebar ul li a:hover, .sidebar ul li a.active {
    background-color: var(--primary-color);
}

.content {
    flex-grow: 1;
    padding: 40px;
    overflow-y: auto;
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

h1 {
    font-size: 2rem;
    margin: 0;
}

.button, button {
    background-color: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: background-color 0.2s ease;
}

.button:hover, button:hover {
    background-color: #4338CA;
}

.button-secondary {
    background-color: var(--secondary-color);
}
.button-secondary:hover {
    background-color: #5a616b;
}


table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    background-color: var(--content-bg);
    box-shadow: var(--shadow);
    border-radius: 8px;
    overflow: hidden;
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

thead th {
    background-color: #F9FAFB;
    font-weight: 600;
}

tbody tr:last-child td {
    border-bottom: none;
}

tbody tr:hover {
    background-color: #F3F4F6;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: #fefefe;
    margin: 10% auto;
    padding: 30px;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    border-radius: 8px;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
}

.close-button {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close-button:hover,
.close-button:focus {
    color: black;
}

form label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

form input, form select, form textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-sizing: border-box;
}

.analytics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
}

.chart-container {
    background-color: var(--content-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}