:root {
  --primary-color: #EE4D2D;
  --primary-hover: #D73211;
  --bg-color: #F8F9FA;
  --card-bg: #FFFFFF;
  --text-main: #333333;
  --text-muted: #757575;
  --success-color: #2E7D32;
  --danger-color: #D32F2F;
  --info-bg: #FFF3E0;
  --info-text: #E65100;
  --border-soft: #EEEEEE;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", Roboto, Arial, sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.calculator-card {
  background-color: var(--card-bg);
  width: 100%;
  max-width: 480px;
  padding: 35px;
  border-radius: 20px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
  margin-bottom: 30px;
}

.header {
  text-align: center;
  margin-bottom: 20px;
}

.header h1 {
  font-size: 26px;
  color: var(--primary-color);
  margin-bottom: 5px;
}

.header p {
  font-size: 14px;
  color: var(--text-muted);
}

.alert-info {
  background-color: var(--info-bg);
  color: var(--info-text);
  padding: 12px;
  border-radius: 10px;
  font-size: 13px;
  text-align: center;
  margin-bottom: 25px;
  border: 1px dashed #FFB74D;
}

.input-group {
  margin-bottom: 18px;
}

.input-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
}

.input-wrapper {
  position: relative;
}

.input-wrapper span {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-weight: 500;
}

.input-group input,
.input-group select {
  width: 100%;
  padding: 12px 15px 12px 45px;
  border: 2px solid var(--border-soft);
  border-radius: 10px;
  font-size: 16px;
  transition: border-color 0.3s, box-shadow 0.3s;
  outline: none;
  background: #FFFFFF;
  appearance: none;
}

.input-group select {
  padding-left: 15px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23757575' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 15px center;
  background-size: 18px;
}

.input-group input:focus,
.input-group select:focus,
.checkbox-group:focus-within,
.btn-calcular:focus-visible {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(238, 77, 45, 0.15);
}

.row-inputs {
  display: flex;
  gap: 15px;
}

.row-inputs .input-group {
  flex: 1;
}

.checkbox-group {
  display: flex;
  align-items: center;
  margin-bottom: 14px;
  padding: 12px;
  background-color: #FBFBFB;
  border-radius: 10px;
  border: 1px solid var(--border-soft);
  cursor: pointer;
}

.checkbox-group input {
  margin-right: 12px;
  width: 18px;
  height: 18px;
  accent-color: var(--primary-color);
}

.privacy-note {
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1.5;
  margin-bottom: 18px;
  text-align: center;
}

.btn-calcular {
  width: 100%;
  background-color: var(--primary-color);
  color: #FFFFFF;
  border: none;
  padding: 16px;
  font-size: 18px;
  font-weight: 700;
  border-radius: 10px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(238, 77, 45, 0.3);
  transition: background-color 0.3s, transform 0.2s;
}

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

.btn-calcular:active {
  transform: translateY(1px);
}

.results {
  margin-top: 30px;
  padding-top: 20px;
  border-top: 2px dashed var(--border-soft);
  display: none;
}

.results.is-visible {
  display: block;
}

.result-item {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 10px;
  font-size: 14px;
}

.hidden {
  display: none;
}

.result-item.is-visible {
  display: flex;
}

.destaque-negativo {
  color: var(--danger-color);
  font-weight: 500;
}

.destaque-positivo {
  color: var(--success-color);
  font-weight: 500;
}

.result-highlight {
  font-size: 20px;
  font-weight: 700;
  margin-top: 15px;
  padding: 20px;
  background-color: #F9F9F9;
  border-radius: 12px;
  text-align: center;
}

.result-highlight.positive {
  background-color: #E8F5E9;
  border: 1px solid #A5D6A7;
}

.result-highlight.negative {
  background-color: #FFEBEE;
  border: 1px solid #EF9A9A;
}

.result-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 400;
  margin-bottom: 5px;
}

.result-value {
  font-size: 32px;
}

.result-value.positive {
  color: var(--success-color);
}

.result-value.negative {
  color: var(--danger-color);
}

.result-margin {
  font-size: 16px;
  margin-top: 5px;
}

.faixa-info {
  font-size: 12px;
  text-align: center;
  color: var(--text-muted);
  margin-top: 15px;
  font-style: italic;
}

footer {
  width: 100%;
  text-align: center;
  padding: 20px 0;
  color: var(--text-muted);
  font-size: 12px;
}

footer p {
  margin-bottom: 5px;
}

@media (max-width: 520px) {
  body {
    padding: 12px;
  }

  .calculator-card {
    padding: 24px;
  }

  .row-inputs {
    flex-direction: column;
    gap: 0;
  }
}