/* ===================================================
 * CALCULADORA-BTU.CSS - v2.0 - Estilos Modernos
 * =================================================== */

/* --- Botão Flutuante --- */
.btn-float {
  position: fixed;
  bottom: 25px;
  right: 25px;
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary-dark));
  color: var(--color-white);
  border-radius: 50%;
  border: none;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 1049;
  transition: all var(--transition-slow);
}

.btn-float:hover {
  transform: translateY(-5px) scale(1.1);
  box-shadow: 0 15px 25px rgba(0, 0, 0, 0.25);
}

/* --- Estilos do Modal (Pop-up) --- */
.modal {
  position: fixed;
  z-index: 1050;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  
  /* Animação de Fundo */
  background-color: rgba(0, 0, 0, 0.4);
  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
  transition: opacity var(--transition-slow);
  opacity: 0;
  
  /* Começa escondido, mas é controlado por JS */
  display: none; 
}

/* Estado ativo do modal */
.modal.active {
  display: block; /* Mude para block, pois o posicionamento é absoluto */
  opacity: 1;
}

.btu-modal-content {
  position: absolute;
  top: 50%;
  left: 50%;
  background-color: var(--color-white);
  padding: 0;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  width: 95%;
  max-width: 500px; /* Reduced from 620px */
  max-height: 90vh; /* Added max-height */
  display: flex; /* Added for flex layout */
  flex-direction: column; /* Added for flex layout */
  
  /* Animação de Entrada */
  transform: translate(-50%, -50%) scale(0.95);
  opacity: 0;
  transition: transform var(--transition-slow), opacity var(--transition-slow);
}
.modal.active .btu-modal-content {
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg) var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
  margin: 0;
  color: var(--color-primary-dark);
  font-size: var(--font-size-xl);
}

.close-button {
  background-color: var(--color-bg-light);
  border: none;
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}
.close-button:hover {
  background-color: var(--color-error);
  color: var(--color-white);
  transform: rotate(90deg);
}

.modal-body {
  padding: var(--spacing-xl);
  overflow-y: auto; /* Allow scrolling */
  flex-grow: 1; /* Allow body to take available space */
}

/* Formulário da Calculadora */
#btu-form .form-group {
  margin-bottom: var(--spacing-xl);
}
#btu-form .form-group label {
  font-weight: 600;
  display: block;
  margin-bottom: var(--spacing-sm);
}

#btu-form .input-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

/* Inputs de Número */
#btu-form input[type="number"] {
  background-color: var(--color-bg-light);
  text-align: center;
  font-size: var(--font-size-lg);
}

/* Inputs de Radio como Botões */
#btu-form .radio-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
}
#btu-form .radio-group label {
  position: relative;
  margin: 0;
}
#btu-form .radio-group input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
}
#btu-form .radio-group span {
  display: block;
  text-align: center;
  padding: var(--spacing-md);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  font-weight: 500;
}

#btu-form .radio-group input[type="radio"]:checked + span {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary-dark);
  color: var(--color-white);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}
#btu-form .radio-group input[type="radio"]:hover + span {
  border-color: var(--color-primary-light);
}


/* Resultado */
.resultado-btu {
  color: var(--color-white);
  background: var(--color-primary-dark);
  border-radius: var(--radius-lg);
  margin: var(--spacing-xl) 0;
  text-align: center;
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  transition: all var(--transition-slow);
}

.resultado-btu p {
  margin: 0;
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.8);
}
.resultado-btu strong {
  display: block;
  font-size: 2.5rem; /* 40px */
  color: var(--color-white);
  margin-top: var(--spacing-sm);
}
.resultado-btu small {
  color: rgba(255, 255, 255, 0.6);
  font-style: italic;
}

.resultado-actions {
  margin-top: var(--spacing-lg);
  width: 100%;
  padding: var(--spacing-md);
  display: none; /* Inicialmente escondido até que haja resultado */
}


/* Aviso Legal */
.aviso-legal {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-lg);
  margin-top: var(--spacing-xl);
  line-height: 1.5;
}
.aviso-legal ul {
  padding-left: var(--spacing-lg);
  margin-top: var(--spacing-sm);
}
.aviso-legal a {
  font-weight: 600;
}