:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --background-color: #f8fafc;
    --text-color: #1e293b;
    --border-color: #e2e8f0;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
}

.navbar {
    background-color: white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.navbar-brand img {
    height: 40px;
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--background-color);
}

.login-card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    width: 100%;
    max-width: 400px;
    padding: 2rem;
}

.login-logo {
    width: 120px;
    margin-bottom: 2rem;
}

.form-control {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    transition: all 0.2s;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn-primary {
    background-color: var(--primary-color);
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    transition: all 0.2s;
}

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

.stats-card {
    border-radius: 12px;
    border: none;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s;
}

.stats-card:hover {
    transform: translateY(-2px);
}

.table {
    background: white;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.table thead th {
    background-color: #f8fafc;
    border-bottom: 2px solid var(--border-color);
    color: #64748b;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.table tbody tr:hover {
    background-color: #f1f5f9;
}

.badge {
    padding: 0.5em 1em;
    font-weight: 500;
    border-radius: 6px;
}

.pagination {
    margin-top: 2rem;
}

.page-link {
    border: none;
    margin: 0 0.25rem;
    border-radius: 6px;
    color: var(--text-color);
}

.page-item.active .page-link {
    background-color: var(--primary-color);
}

.modal-content {
    border-radius: 16px;
    border: none;
}

.modal-header {
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.875rem;
}