/* ============================================================================
   select-button-native.css — Select com botao "+" nativo (brand style, azul)
   ----------------------------------------------------------------------------
   Componente AUTOSSUFICIENTE: NAO depende do Tailwind JIT/CDN. Basta
   referenciar este CSS na pagina e usar a marcacao abaixo.

   USO SIMPLES (sem floating label):

     <div class="select-native-group">
       <select id="unidade" class="select-native-select">
         <option value="">Selecione...</option>
         <option value="1">UNIDADE</option>
       </select>
       <button class="select-native-btn" title="Cadastrar">
         <i class="fas fa-plus"></i>
       </button>
     </div>

   USO COM FLOATING LABEL (label dentro do select, flutua ao selecionar):

     <div class="select-native-group">
       <div class="select-native-field">
         <select id="unidade" class="select-native-select" required>
           <option value=""></option>
           <option value="1">UNIDADE</option>
         </select>
         <label for="unidade" class="select-native-label">Unidade de Medida</label>
       </div>
       <button class="select-native-btn" title="Cadastrar">
         <i class="fas fa-plus"></i>
       </button>
     </div>

   Regras:
   - Para floating label, o <select> PRECISA do atributo required (CSS usa
     :valid/:invalid para detectar se ha valor selecionado).
   - A primeira <option> deve ter value="" (vazio) para o estado "nada selecionado".
   - O <label> deve ser irmao do <select> dentro de .select-native-field.
   - Tema claro/escuro automatico via variaveis de variables.css.
   ============================================================================ */

.select-native-group {
  display: flex;
  align-items: stretch;
}

/* ---- Field wrapper (necessario apenas para floating label) ----------------- */
.select-native-field {
  position: relative;
  flex: 1 1 0%;
  min-width: 0;
}

/* ---- Select --------------------------------------------------------------- */
.select-native-select {
  flex: 1 1 0%;
  min-width: 0;
  display: block;
  width: 100%;
  padding: 0.625rem 0.75rem;
  font-size: 0.875rem;
  line-height: 1.25rem;
  color: var(--text-primary, #0f172a);
  background-color: var(--bg-surface, #ffffff);
  border: 1px solid var(--border-color, #d1d5db);
  border-top-right-radius: 0 !important;
  border-bottom-right-radius: 0 !important;
  border-radius: 0.5rem;
  appearance: none;
  outline: none;
  box-shadow: 0 1px 2px 0 rgba(0,0,0,.05);
  transition: border-color .15s ease, box-shadow .15s ease;
}

.select-native-field .select-native-select {
  width: 100%;
}

.select-native-field:has(.select-native-label) .select-native-select {
  padding-top: 1rem;
  padding-bottom: 0.5rem;
}

.select-native-select:focus {
  border-color: var(--color-primary-600, #0066cc);
  box-shadow: 0 0 0 1px var(--color-primary-600, #0066cc);
}

/* ---- Floating Label ------------------------------------------------------- */
.select-native-label {
  position: absolute;
  top: 50%;
  left: 0.75rem;
  transform: translateY(-50%);
  transform-origin: 0 center;
  z-index: 10;
  padding: 0 0.25rem;
  font-size: 0.875rem;
  line-height: 1;
  color: var(--text-muted, #94a3b8);
  background-color: var(--bg-surface, #ffffff);
  pointer-events: none;
  white-space: nowrap;
  max-width: calc(100% - 1.5rem);
  transition: transform .2s ease, color .2s ease, top .2s ease;
}

.select-native-select:valid ~ .select-native-label {
  top: 0;
  transform: translateY(-50%) scale(0.85);
}

.select-native-select:focus ~ .select-native-label {
  color: var(--color-primary-600, #0066cc);
}

/* Modificador: label SEMPRE no topo, mesmo sem selecao.
   Use a classe .label-top em .select-native-field. */
.select-native-field.label-top .select-native-select {
  padding-top: 1rem;
  padding-bottom: 0.5rem;
}
.select-native-field.label-top .select-native-label {
  top: 0;
  transform: translateY(-50%) scale(0.85);
}

/* ---- Button (brand style - azul) ----------------------------------------- */
.select-native-btn {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  padding: 0 0.75rem;
  font-size: 0.875rem;
  color: #ffffff;
  background-color: var(--color-primary-600, #0066cc);
  border: 1px solid var(--color-primary-600, #0066cc);
  border-left: 0;
  border-top-left-radius: 0 !important;
  border-bottom-left-radius: 0 !important;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: background-color .15s ease, border-color .15s ease;
}

.select-native-btn:hover {
  color: #ffffff;
  background-color: var(--color-primary-700, #0052a3);
  border-color: var(--color-primary-700, #0052a3);
}

/* ---- Tema escuro ---------------------------------------------------------- */
.dark .select-native-select {
  color: var(--text-primary, #f1f5f9);
  background-color: var(--bg-surface, #1e293b);
  border-color: var(--border-color, #334155);
}

.dark .select-native-select:focus {
  border-color: var(--color-primary-400, #1a8cff);
  box-shadow: 0 0 0 1px var(--color-primary-400, #1a8cff);
}

.dark .select-native-label {
  color: var(--text-muted, #64748b);
  background-color: var(--bg-surface, #1e293b);
}

.dark .select-native-select:focus ~ .select-native-label {
  color: var(--color-primary-400, #1a8cff);
}

.dark .select-native-btn {
  color: #ffffff;
  background-color: var(--color-primary-500, #0077e6);
  border-color: var(--color-primary-500, #0077e6);
}

.dark .select-native-btn:hover {
  color: #ffffff;
  background-color: var(--color-primary-400, #1a8cff);
  border-color: var(--color-primary-400, #1a8cff);
}