:root {
    --primary: #0f172a;
    --primary-light: #1e293b;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --bg-main: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --success: #10b981;
    --error: #ef4444;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 0.875rem;
    line-height: 1.5;
    margin: 0;
}

.navbar {
    background-color: var(--primary);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
}

.navbar-brand {
    font-weight: 700;
    letter-spacing: -0.025em;
    color: white !important;
}

.nav-link {
    color: #cbd5e1 !important;
    font-weight: 500;
}

.nav-link.active {
    color: white !important;
}

.sidebar {
    background-color: var(--surface);
    border-right: 1px solid var(--border);
    height: calc(100vh - 56px);
    position: sticky;
    top: 56px;
    padding: 1.5rem 0;
}

.sidebar .nav-link {
    color: var(--text-muted) !important;
    padding: 0.5rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sidebar .nav-link:hover, .sidebar .nav-link.active {
    background-color: var(--bg-main);
    color: var(--accent) !important;
}

.main-content {
    padding: 2rem;
}

.card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.25rem;
    font-weight: 600;
}

.btn-primary {
    background-color: var(--accent);
    border-color: var(--accent);
    font-weight: 500;
    border-radius: 4px;
    padding: 0.5rem 1rem;
}

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

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

.table tbody td {
    padding: 0.75rem 1rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--border);
}

.stat-card {
    padding: 1.25rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    font-weight: 600;
}

.badge-active {
    background-color: #dcfce7;
    color: #166534;
}

.form-control, .form-select {
    border-radius: 4px;
    border: 1px solid var(--border);
    padding: 0.5rem 0.75rem;
}

.form-control:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}