:root {
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --accent-color: #0d6efd;
    --text-color: #212529;
    --text-dim: #6c757d;
    --border-color: #dee2e6;
    --online-color: #198754;
    --offline-color: #dc3545;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
}

.container {
    width: 90%;
    max-width: 1200px;
    padding: 3rem 0;
}

header {
    margin-bottom: 3rem;
}

h1 {
    margin: 0 0 0.5rem;
    font-weight: 600;
    font-size: 2rem;
    color: #1a1a1a;
}

#lastUpdated {
    font-size: 0.9rem;
    color: var(--text-dim);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.card {
    background: var(--card-bg);
    border: none;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.card h3 {
    margin: 0 0 1.25rem;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-dim);
}

.big-number {
    font-size: 3rem;
    font-weight: 600;
    color: #1a1a1a;
}

.online .big-number {
    color: var(--online-color);
}

.offline .big-number {
    color: var(--offline-color);
}

/* Search */
.search-section {
    margin-bottom: 3rem;
}

#groupSearch {
    width: 100%;
    padding: 1.25rem 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-color);
    font-size: 1.1rem;
    outline: none;
    box-shadow: var(--shadow);
    transition: border-color 0.2s;
}

#groupSearch:focus {
    border-color: var(--accent-color);
}

/* Filters */
.filter-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
}

.filter-chip {
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
    color: var(--text-dim);
}

.filter-chip:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.filter-chip.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.2);
}

/* Groups */
.group-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2rem;
}

.group-card {
    background: var(--card-bg);
    border: none;
    padding: 1.75rem;
    border-radius: 16px;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.group-card:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.group-card h4 {
    margin: 0 0 0.75rem;
    color: var(--accent-color);
    font-size: 1.1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.group-info {
    font-size: 0.95rem;
    color: var(--text-dim);
    line-height: 1.5;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
}

.modal-content {
    background: var(--card-bg);
    border: none;
    margin: 4% auto;
    padding: 3rem;
    width: 85%;
    max-width: 1000px;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.close {
    float: right;
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: white;
}

/* Tables */
.table-container {
    margin-top: 1.5rem;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

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

th {
    color: var(--text-dim);
    font-weight: 400;
    font-size: 0.85rem;
}

.status-badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.status-online {
    background: rgba(63, 185, 80, 0.2);
    color: var(--online-color);
}

.status-offline {
    background: rgba(248, 81, 73, 0.2);
    color: var(--offline-color);
}

.clickable-row {
    cursor: pointer;
}

.clickable-row:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* Chart */
.chart-container {
    margin-top: 2rem;
    height: 400px;
}