/* /admin/assets/css/admin.css */
body {
    font-family: 'Segoe UI', system-ui, sans-serif;
}
.sidebar {
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    width: 250px;
    background: #f8f9fa;
    border-right: 1px solid #e9ecef;
    overflow-y: auto;
}
.main-content {
    margin-left: 250px;
    padding: 20px;
}
.nav-link {
    color: #495057 !important;
    font-weight: 500;
}
.nav-link:hover, .nav-link.active {
    color: #0d6efd !important;
    background: #e7f1ff;
    border-radius: 6px;
}
.card {
    border: none;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    border-radius: 10px;
    margin-bottom: 24px;
}
.card-header {
    font-weight: 600;
    padding: 1rem 1.25rem;
    background: #f8f9fa;
    border-bottom: 1px solid #e9ecef;
}
.table th {
    font-weight: 600;
}
.badge-used { background: #dc3545; }
.badge-unused { background: #198754; }

/* 登录页专用 */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
}
.login-card {
    border-radius: 16px;
    box-shadow: 0 12px 30px rgba(0,0,0,0.25);
}