:root {
    --primary-color: #0f172a;
    --secondary-color: #3b82f6;
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    --border-color: #e2e8f0;
    --text-main: #1e293b;
    --text-muted: #64748b;
}

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 0;
}

.sidebar {
    width: 260px;
    height: 100vh;
    background-color: var(--primary-color);
    color: white;
    position: fixed;
    left: 0;
    top: 0;
    padding: 1.5rem;
    z-index: 1000;
}

.sidebar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    color: #94a3b8;
    padding: 0.75rem 1rem;
    border-radius: 0.375rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    transition: all 0.2s;
    margin-bottom: 0.25rem;
}

.nav-link:hover, .nav-link.active {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

.main-content {
    margin-left: 260px;
    padding: 2rem;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.btn-primary {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    padding: 0.5rem 1.25rem;
    font-weight: 500;
}

.table thead th {
    background-color: #f1f5f9;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom-width: 1px;
}

.stats-card {
    display: flex;
    flex-direction: column;
}

.stats-card .label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.last-child-no-border:last-child {
    border-bottom: none !important;
    margin-bottom: 0 !important;
    padding-bottom: 0 !important;
}

.user-profile {
    padding: 0.5rem;
    border-radius: 2rem;
    transition: background-color 0.2s;
}

.user-profile:hover {
    background-color: #f1f5f9;
}