/* ==========================================================================
   CONTENEDOR Y TARJETA PRINCIPAL
   ========================================================================== */
.container {
  max-width: 980px;
  margin: 1% auto;
  padding: 0 1.25rem;
}

.container h2 {
  font-size: 1.85rem;
  font-weight: 800;
  margin: 0 0 0.35rem 0;
  letter-spacing: -0.03em;
}

.tool-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0 0 2rem 0;
}

.calculator-card {
  background-color: var(--bg-card);
  padding: 0;
}

.caja-section h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 0.35rem 0;
  color: #1e293b;
}

.section-help {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin: 0 0 1.25rem 0;
}

.divider {
  margin: 2rem 0;
}

/* ==========================================================================
   FORMULARIOS Y CAMPOS
   ========================================================================== */
.grid-2-col {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.grid-2-col label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: #334155;
  margin-bottom: 0.4rem;
}

input[type="text"],
input[type="number"],
select {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.925rem;
  color: var(--text-main);
  background-color: #ffffff;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus,
select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* ==========================================================================
   BARRA DE CARGA DE INSUMOS
   ========================================================================== */
.form-stack-costos {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background-color: #f8fafc;
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.88rem;
  font-weight: 600;
  color: #334155;
}

.btn-block {
  width: 100%;
  padding: 0.85rem;
  font-size: 0.95rem;
  margin-top: 0.5rem;
}

/* ==========================================================================
   BOTONES
   ========================================================================== */
.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
  border: none;
  padding: 0.75rem 1.35rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.15s ease;
  white-space: nowrap;
}

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

.btn-text-danger {
  background: transparent;
  border: none;
  color: var(--danger);
  font-size: 1.2rem;
  font-weight: bold;
  cursor: pointer;
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  line-height: 1;
  transition: all 0.15s ease;
}

.btn-text-danger:hover {
  background-color: var(--danger-bg);
  color: var(--danger-hover);
}

/* ==========================================================================
   TABLA DE INSUMOS
   ========================================================================== */
.table-container {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.costos-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.costos-table thead {
  background-color: #f1f5f9;
}

.costos-table th {
  padding: 0.85rem 1rem;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.costos-table td {
  padding: 0.9rem 1rem;
  font-size: 0.925rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-main);
}

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

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

.badge-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.55rem;
  border-radius: 6px;
  background-color: #f1f5f9;
  color: #475569;
  border: 1px solid #e2e8f0;
}

/* ==========================================================================
   RESUMEN FINAL DE COSTOS (MÉTRICAS)
   ========================================================================== */
.final-summary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}

.summary-box {
  background-color: #f8fafc;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.summary-box span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.summary-box strong {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.summary-box.highlight-profit {
  grid-column: 1 / -1;
  max-width: 520px;
  width: 100%;
  margin: 0 auto;
  background-color: #0f172a;
  border-color: #0f172a;
  padding: 1.5rem;
  box-shadow: 0 8px 20px -4px rgba(15, 23, 42, 0.25);
}

.summary-box.highlight-profit span {
  color: #94a3b8;
  font-size: 0.9rem;
}

.summary-box.highlight-profit strong {
  color: #38bdf8;
  font-size: 2rem;
}

/* ==========================================================================
   ADAPTACIÓN RESPONSIVA (CELULARES Y TABLETS)
   ========================================================================== */
@media (max-width: 768px) {
  /* Contenedor y tarjeta */
  .container {
    margin: 1.25rem auto;
    padding: 0 0.85rem;
  }

  .container h2 {
    font-size: 1.45rem;
  }

  .calculator-card {
    padding: 1.25rem 1rem;
    border-radius: var(--radius-md);
  }

  /* Cabecera y Menú */
  .header-container {
    flex-direction: column;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
  }

  .main-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.35rem;
    width: 100%;
  }

  .main-nav a {
    font-size: 0.8rem;
    padding: 0.35rem 0.6rem;
  }

  /* Secciones en 1 sola columna */
  .grid-2-col,
  .final-summary-grid {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }

  /* Formulario de insumos */
  .form-stack-costos {
    padding: 1rem;
    gap: 0.85rem;
  }

  /* Tabla de insumos con scroll horizontal suave */
  .table-container {
    border-radius: var(--radius-sm);
    -webkit-overflow-scrolling: touch;
    margin-top: 1rem !important;
  }

  .costos-table {
    min-width: 580px; /* Evita que las columnas se aplasten */
  }

  .costos-table th,
  .costos-table td {
    padding: 0.65rem 0.75rem;
    font-size: 0.82rem;
  }

  /* Tarjeta de Ganancia/Costo Unitario */
  .summary-box.highlight-profit {
    max-width: 100%;
    padding: 1.25rem 1rem;
  }

  .summary-box.highlight-profit strong {
    font-size: 1.65rem;
  }
}

@media (max-width: 420px) {
  .btn-block {
    font-size: 0.88rem;
    padding: 0.75rem 0.5rem;
  }

  .main-nav a {
    font-size: 0.75rem;
    padding: 0.3rem 0.45rem;
  }
}
  .grid-2-col,
  .form-row-costos,
  .final-summary-grid {
    grid-template-columns: 1fr;
  }

  .summary-box.highlight-profit {
    max-width: 100%;
  }