/* ==========================================================================
   ElectroStock - Sistema de Gestão de Estoque de Eletrônicos
   Folha de Estilo CSS Única, Moderna e Responsiva (Mobile-First)
   ========================================================================== */

:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-color: #0f172a;
  --background-color: #f8fafc;
  --card-background: #ffffff;
  --text-color: #334155;
  --text-light: #64748b;
  --border-color: #e2e8f0;
  
  /* Cores de Alerta e Status */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #06b6d4;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --border-radius: 8px;
  --transition-speed: 0.2s;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   Layout & Estrutura
   ========================================================================== */

.navbar {
  background-color: var(--secondary-color);
  color: #ffffff;
  padding: 1rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  box-shadow: var(--shadow-md);
}

@media (min-width: 768px) {
  .navbar {
    flex-direction: row;
    justify-content: space-between;
  }
}

.navbar-brand {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.navbar-brand span {
  color: var(--primary-color);
}

.navbar-nav {
  display: flex;
  gap: 1rem;
  align-items: center;
  list-style: none;
}

.navbar-link {
  color: #cbd5e1;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-speed);
}

.navbar-link:hover,
.navbar-link.active {
  color: #ffffff;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

/* ==========================================================================
   Componentes de UI & Cards
   ========================================================================== */

.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

@media (min-width: 640px) {
  .dashboard-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .dashboard-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background-color: var(--card-background);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-title {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-light);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.card-value {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--secondary-color);
}

.card-value.lucro {
  color: var(--color-success);
}

/* ==========================================================================
   Formulários & Inputs
   ========================================================================== */

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.375rem;
  color: var(--text-color);
}

.form-control {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text-color);
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 640px) {
  .form-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Simulador de Código de Barras */
.barcode-scanner-box {
  background: linear-gradient(135deg, #1e293b, #0f172a);
  color: #ffffff;
  padding: 1.5rem;
  border-radius: var(--border-radius);
  margin-bottom: 2rem;
  border-left: 4px solid var(--primary-color);
}

.barcode-scanner-box .form-label {
  color: #94a3b8;
}

.barcode-scanner-box .form-control {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  font-family: monospace;
  font-size: 1.1rem;
  letter-spacing: 0.1em;
}

.barcode-scanner-box .form-control:focus {
  background-color: rgba(255, 255, 255, 0.15);
  border-color: var(--primary-color);
}

/* ==========================================================================
   Botões
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.625rem 1.25rem;
  border-radius: var(--border-radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-speed), border-color var(--transition-speed), opacity var(--transition-speed);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #ffffff;
}

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

.btn-secondary {
  background-color: #ffffff;
  border-color: var(--border-color);
  color: var(--text-color);
}

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

.btn-danger {
  background-color: var(--color-danger);
  color: #ffffff;
}

.btn-danger:hover {
  background-color: #dc2626;
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8rem;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ==========================================================================
   Tabelas Responsivas
   ========================================================================== */

.table-responsive {
  width: 100%;
  overflow-x: auto;
  background-color: var(--card-background);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.table th {
  background-color: #f1f5f9;
  color: var(--text-color);
  font-weight: 600;
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.table td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-color);
  vertical-align: middle;
}

.table tr:last-child td {
  border-bottom: none;
}

.table tr:hover td {
  background-color: #f8fafc;
}

/* ==========================================================================
   Alertas, Badges e Estados Visuais
   ========================================================================== */

/* Alertas de Estoque Baixo */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 9999px;
  text-transform: uppercase;
}

.badge-success {
  background-color: #d1fae5;
  color: #065f46;
}

.badge-danger {
  background-color: #fee2e2;
  color: #991b1b;
  animation: pulse 2s infinite;
}

.badge-warning {
  background-color: #fef3c7;
  color: #92400e;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

/* Linha de produto com estoque crítico */
.row-danger {
  background-color: #fff5f5;
}
.row-danger:hover td {
  background-color: #fee2e2 !important;
}

/* Mensagens de Feedback */
.alert {
  padding: 1rem;
  border-radius: var(--border-radius);
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid transparent;
}

.alert-success {
  background-color: #ecfdf5;
  border-color: #a7f3d0;
  color: #065f46;
}

.alert-danger {
  background-color: #fef2f2;
  border-color: #fca5a5;
  color: #991b1b;
}

/* ==========================================================================
   Modais Sobrepostos (Overlay)
   ========================================================================== */

.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-speed) ease;
  padding: 1rem;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background-color: var(--card-background);
  border-radius: var(--border-radius);
  width: 100%;
  max-width: 550px;
  box-shadow: var(--shadow-lg);
  transform: translateY(-20px);
  transition: transform var(--transition-speed) ease;
  overflow: hidden;
}

.modal-backdrop.active .modal {
  transform: translateY(0);
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: #f8fafc;
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--secondary-color);
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-light);
  line-height: 1;
  transition: color var(--transition-speed);
}

.modal-close:hover {
  color: var(--color-danger);
}

.modal-body {
  padding: 1.5rem;
  max-height: 75vh;
  overflow-y: auto;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  background-color: #f8fafc;
}

/* ==========================================================================
   Estados de Carregamento (Loading)
   ========================================================================== */

.spinner {
  width: 1.5rem;
  height: 1.5rem;
  border: 3px solid rgba(37, 99, 235, 0.2);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: inline-block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  border-radius: var(--border-radius);
}

/* ==========================================================================
   Tela de Login Dedicada
   ========================================================================== */

.login-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: radial-gradient(circle at top right, #1e293b, #0f172a);
}

.login-card {
  width: 100%;
  max-width: 400px;
  background-color: #ffffff;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  padding: 2.5rem 2rem;
}

.login-header {
  text-align: center;
  margin-bottom: 2rem;
}

.login-logo {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--secondary-color);
  margin-bottom: 0.5rem;
}

.login-logo span {
  color: var(--primary-color);
}

.login-subtitle {
  color: var(--text-light);
  font-size: 0.9rem;
}