:root {
  /* Cores de Ação (Mantidas iguais para identidade) */
  --primary-color: #0d6efd; 
  --primary-hover: #0b5ed7; 
  --success-color: #198754; 
  --warning-color: #ffc107;
  --error-color: #dc3545;

  /* === PALETA DARK MODE === */
  --bg-color: #121212;          /* Fundo da página */
  --card-bg: #1e1e1e;           /* Fundo do "App" */
  --text-main: #e0e0e0;         /* Texto principal (quase branco) */
  --text-muted: #adb5bd;        /* Texto secundário */
  --border-color: #333333;      /* Bordas sutis */
  --input-bg: #2b2b2b;          /* Fundo dos campos */
  --input-border: #444444;      /* Borda dos campos */
  --header-bg: #252525;         /* Cabeçalhos de tabela/seção */
}

* { box-sizing: border-box; }

body { 
  font-family: 'Inter', sans-serif; 
  margin: 0; 
  padding: 20px; 
  background-color: var(--bg-color); 
  color: var(--text-main); 
}

#app { 
  max-width: 800px; 
  margin: 20px auto; 
  padding: 30px; 
  background-color: var(--card-bg); 
  border-radius: 12px; 
  box-shadow: 0 8px 24px rgba(0,0,0,0.4); /* Sombra mais forte no escuro */
  border: 1px solid var(--border-color);
}

h1 { text-align: center; font-size: 1.8rem; margin-bottom: 1.5rem; color: var(--text-main); }
h3 { color: var(--primary-color); border-bottom: 2px solid var(--border-color); padding-bottom: 8px; margin-top: 25px; font-size: 1.1rem; }

/* TABS */
.tabs { display: flex; border-bottom: 2px solid var(--border-color); margin-bottom: 25px; }
.tab-link { 
  flex: 1; 
  padding: 15px; 
  background: none; 
  border: none; 
  font-weight: 600; 
  color: var(--text-muted); 
  cursor: pointer; 
  border-bottom: 3px solid transparent; 
  transition: all 0.2s; 
}
.tab-link:hover { color: var(--primary-color); background-color: rgba(13, 110, 253, 0.1); }
.tab-link.active { color: var(--primary-color); border-bottom-color: var(--primary-color); }

.tab-content { display: none; animation: fadeIn 0.3s; }
.tab-content.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }

/* Explicação da Aba (Box Azulada) */
.tab-explanation { 
  background-color: rgba(13, 110, 253, 0.15); /* Azul transparente */
  padding: 15px; 
  border-radius: 8px; 
  border-left: 5px solid var(--primary-color); 
  font-size: 0.9rem; 
  margin-bottom: 20px; 
  color: #b6d4fe; /* Azul claro para texto */
}
.tab-explanation strong { color: #fff; }

/* FORMS */
.form-section { margin-bottom: 15px; }
.form-group { margin-bottom: 15px; }
.form-group label { 
  display: block; 
  font-weight: 600; 
  font-size: 0.85rem; 
  color: var(--text-muted); 
  margin-bottom: 5px; 
  text-transform: uppercase; 
}

/* Inputs e Selects Dark */
input, select { 
  width: 100%; 
  padding: 10px; 
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-main);
  border-radius: 6px; 
  font-size: 1rem; 
}
input::placeholder { color: #666; }
input:focus, select:focus { 
  border-color: var(--primary-color); 
  outline: none; 
  box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.25); 
}

/* Ajuste do grupo W/kW */
.radio-select-container {
    display: flex; 
    align-items: center; 
    justify-content: space-around; 
    background: var(--input-bg); 
    border: 1px solid var(--input-border); 
    border-radius: 6px; 
    padding: 0 10px;
    height: 100%; /* Para alinhar altura com input */
}

.input-group { display: flex; gap: 15px; }
.input-group > div { flex: 1; }

.warning-box { 
  background-color: rgba(255, 193, 7, 0.1); 
  color: #ffc107; 
  padding: 10px; 
  border-radius: 6px; 
  border: 1px solid rgba(255, 193, 7, 0.3); 
  font-size: 0.9rem; 
  margin-top: 5px; 
}

/* BUTTONS */
.button-group { margin-top: 25px; display: flex; gap: 10px; }
.calculate-btn { 
  flex: 1; 
  padding: 15px; 
  background-color: var(--primary-color); 
  color: white; 
  border: none; 
  border-radius: 8px; 
  font-weight: 700; 
  cursor: pointer; 
  font-size: 1.1rem; 
  box-shadow: 0 4px 6px rgba(0,0,0,0.3); 
}
.calculate-btn:hover { background-color: var(--primary-hover); transform: translateY(-1px); }
.reset-btn { padding: 15px 25px; background-color: #495057; color: white; border: none; border-radius: 8px; font-weight: 600; cursor: pointer; }
.reset-btn:hover { background-color: #343a40; }

.btn-small { padding: 8px 15px; background-color: #495057; color: white; border: none; border-radius: 5px; cursor: pointer; font-size: 0.9rem; }
.btn-small:hover { background-color: #343a40; }

/* RESULTS */
#results-panel { 
  display: none; 
  margin-top: 30px; 
  background-color: #252525; /* Um pouco mais claro que o fundo */
  padding: 25px; 
  border-radius: 12px; 
  border: 1px solid var(--border-color); 
}
.results-header { display: flex; justify-content: space-between; align-items: center; border-bottom: 2px solid var(--border-color); padding-bottom: 10px; margin-bottom: 20px; }
.results-header h2 { margin: 0; font-size: 1.4rem; color: var(--primary-color); }

.summary-box { display: flex; gap: 20px; margin-bottom: 25px; }
.result-item { 
  flex: 1; 
  background: var(--input-bg); 
  padding: 15px; 
  border-radius: 8px; 
  text-align: center; 
  box-shadow: 0 2px 4px rgba(0,0,0,0.2); 
  border: 1px solid var(--border-color); 
}
.result-item-label { font-size: 0.8rem; text-transform: uppercase; color: var(--text-muted); font-weight: 700; margin-bottom: 5px; }
.result-item-value { font-size: 2rem; font-weight: 800; }
.breaker { color: #6ea8fe; } /* Azul mais claro para ler no escuro */
.cable { color: #75b798; }   /* Verde mais claro para ler no escuro */

.tech-details { 
  background-color: var(--input-bg); 
  padding: 15px; 
  border-radius: 8px; 
  border: 1px solid var(--border-color); 
  margin-bottom: 20px; 
  font-size: 0.9rem; 
}
.tech-details ul { list-style: none; padding: 0; margin: 0; }
.tech-details li { margin-bottom: 6px; border-bottom: 1px dotted var(--border-color); padding-bottom: 4px; }
.tech-details li span { float: right; font-weight: 600; color: var(--text-main); }

table { width: 100%; border-collapse: collapse; background: var(--input-bg); font-size: 0.9rem; }
th, td { padding: 10px; border: 1px solid var(--border-color); text-align: center; }
th { background-color: var(--header-bg); color: var(--text-main); }
.recommended-row { 
  background-color: rgba(25, 135, 84, 0.2); /* Verde transparente */
  font-weight: bold; 
  border: 2px solid var(--success-color); 
}

.error-panel { 
  display: none; 
  background-color: rgba(220, 53, 69, 0.2); 
  color: #ea868f; 
  padding: 15px; 
  border-radius: 8px; 
  margin-top: 20px; 
  text-align: center; 
  border: 1px solid rgba(220, 53, 69, 0.4); 
  font-weight: 600; 
}

.footer-note { font-size: 0.8rem; color: var(--text-muted); margin-top: 15px; text-align: center; font-style: italic; }

/* === CONFIGURAÇÃO DE IMPRESSÃO (Força fundo BRANCO para economizar tinta) === */
@media print {
  body { background-color: white !important; color: black !important; padding: 0; }
  #app { 
    box-shadow: none; 
    margin: 0; 
    padding: 0; 
    max-width: 100%; 
    border: none; 
    background-color: white !important; 
    color: black !important;
  }
  .screen-only { display: none !important; }
  #print-header { display: block !important; text-align: center; margin-bottom: 20px; }
  #results-panel { display: block !important; border: none; padding: 0; background-color: white !important; }
  .result-item, .tech-details, table, th, td { 
    background-color: white !important; 
    color: black !important; 
    border: 1px solid #000 !important; 
    box-shadow: none !important;
  }
  .breaker, .cable { color: black !important; }
  .recommended-row { background-color: #eee !important; border: 2px solid #000 !important; }
  h2, h3 { color: black !important; border-bottom-color: #000 !important; }
}

@media (max-width: 600px) {
    .input-group { flex-direction: column; gap: 5px; }
    .summary-box { flex-direction: column; }
  /* ESTILOS PARA CAIXA DE DICAS (NOVO) */
.hint-box {
    margin-top: 8px;
    padding: 10px;
    border-radius: 6px;
    font-size: 0.9rem;
    border-left: 4px solid #ccc;
    transition: all 0.3s ease;
}

.hint-motor {
    background-color: #fff3cd;
    color: #856404;
    border-color: #ffc107;
}

.hint-resistivo {
    background-color: #f8d7da;
    color: #721c24;
    border-color: #dc3545;
}

.hint-geral {
    background-color: #d1e7dd;
    color: #0f5132;
    border-color: #198754;
}

.hint-eletronico {
    background-color: #cff4fc;
    color: #055160;
    border-color: #0dcaf0;
}
}