:root {
  /* Colors */
  --primary: #176A5A;
  --secondary: #859D6A;
  --variant: #F4A259;
  --danger: #A64A44;
  --warning: #B5A886;
  --info: #F4A259;
  --text: #2c2c2c;
  --bg: #F2F1E1;
  --white: #FFF;
  
  /* Spacing Scale */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 3rem;
  
  /* Radius */
  --radius: 8px;
  --radius-lg: 20px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
  
  /* Legacy support */
  --bg-btn: #00a86b;
  --text-gray: #4a5d4a;
  --border-color: #e0e0e0;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(180deg, #d4fc79 0%, #96e6a1 100%);
  background-attachment: fixed;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.header {
  background-color: var(--white);
  padding: 20px 32px;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  margin-bottom: 40px;
}

.header__title {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 10px;
}

.header__subtitle {
  font-size: 1rem;
  color: #555;
  max-width: 600px;
  margin: 0 auto;
}

/* O Cartão Branco */
.calculator {
  background: var(--white);
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  padding: 40px;
  width: 100%;
  max-width: 550px;
  margin: 0 auto;
}

/* Inputs e Labels */
.calculator__group {
  margin-bottom: 20px;
}

.calculator__label {
  font-weight: 600;
  color: #333;
  margin-bottom: 8px;
  display: block;
}

.calculator__input {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  font-size: 1rem;
  background-color: #fdfdfd;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.calculator__input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(23, 106, 90, 0.1);
  background-color: #fff;
}

.readonly-input {
  background-color: #f5f5f5 !important;
  color: #888;
}

.helper-text {
  font-size: 0.8rem;
  color: #999;
  margin-top: 5px;
  display: block;
}

.calculator__help {
  font-size: 0.8rem;
  color: #999;
  margin-top: 5px;
  display: block;
}

/* Checkbox Manual */
.calculator__group--manual {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 25px;
}

.calculator__checkbox {
  accent-color: var(--primary);
  width: 18px;
  height: 18px;
}

/* Grid de Transporte */
.transport-grid {
  border: none;
  margin-bottom: 30px;
}

.transport-grid__list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 10px;
}

.transport-grid__item {
  border: 2px solid #f0f0f0;
  border-radius: 12px;
  padding: 15px 5px;
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background: white;
}

.transport-grid__item:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.12);
  border-color: #e0e0e0;
}

/* Esconde o rádio padrão */
.transport-grid__input {
  display: none;
}

/* Efeito de Seleção (Destaque Verde) */
.transport-grid__item:has(input:checked) {
  border-color: var(--primary);
  background-color: #f0fdf4;
  box-shadow: 0 4px 10px rgba(23, 106, 90, 0.1);
}

.transport-grid__icon {
  font-size: 2rem;
  margin-bottom: 5px;
}

.transport-grid__text {
  font-size: 0.85rem;
  font-weight: 500;
  color: #555;
}

/* Botão */
.button {
  width: 100%;
  background-color: var(--bg-btn);
  color: white;
  padding: 16px;
  border: none;
  border-radius: 12px;
  font-size: 1.1rem;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.3s, transform 0.2s;
}

.button:hover:not(:disabled) {
  background-color: var(--secondary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.button:active:not(:disabled) {
  transform: translateY(0);
}

.button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.calculator__actions {
  display: flex;
  gap: 10px;
}

.footer {
  margin-top: 20px;
  color: #666;
  font-size: 0.85rem;
  text-align: center;
}

/* Seções de Resultado */
.results, .comparison, .carbon-credits {
  background: var(--white);
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  padding: 30px;
  width: 100%;
  max-width: 550px;
  margin: 20px auto 0;
}

.results__title,
.comparison__title,
.carbon-credits__title {
  font-size: 1.3rem;
  color: var(--primary);
  margin-bottom: 20px;
  font-weight: 600;
}

.results__content,
.comparison__content,
.carbon-credits__content {
  line-height: 1.8;
  color: #333;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.results__content ul,
.comparison__content ul,
.carbon-credits__content ul {
  margin-left: 20px;
  margin-top: 10px;
}

.results__content li,
.comparison__content li,
.carbon-credits__content li {
  margin-bottom: 8px;
}

.results__content h4,
.comparison__content h4,
.carbon-credits__content h4 {
  color: var(--primary);
  margin-top: 15px;
  margin-bottom: 10px;
}

/* Utility class to hide elements */
.hidden {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Spinner Animation */
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 3px solid rgba(0, 0, 0, 0.1);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ===== RESULT CARDS STYLING ===== */

/* Result Card */
.result-card {
  background: linear-gradient(135deg, #f8f9fa 0%, #fff 100%);
  border-left: 4px solid var(--primary);
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 16px;
}

.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid #eee;
  font-size: 1rem;
}

.result-item:last-child {
  border-bottom: none;
}

.result-item.highlight {
  background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
  margin: 0 -20px -20px -20px;
  padding: 12px 20px;
  border-radius: 0 0 12px 12px;
  font-weight: 600;
  color: var(--primary);
}

.result-label {
  font-weight: 600;
  color: var(--text-gray);
  min-width: 120px;
}

.result-value {
  color: #333;
  font-weight: 500;
}

/* Comparison Grid */
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.comparison-card {
  background: white;
  border: 2px solid #f0f0f0;
  border-radius: 12px;
  padding: 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.comparison-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
  border-color: #e0e0e0;
}

.comparison-card--selected {
  background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(23, 106, 90, 0.15);
}

.comparison-icon {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

.comparison-name {
  font-weight: 600;
  color: var(--text);
  font-size: 0.95rem;
  margin-bottom: 8px;
}

.comparison-emission {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}

.comparison-sustainability {
  font-size: 1.5rem;
  margin-bottom: 10px;
}

.comparison-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--primary);
  color: white;
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
}

/* Credits Card */
.credits-card {
  background: linear-gradient(135deg, #fefce8 0%, #fffacd 100%);
  border-left: 4px solid #f4a259;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.credit-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  font-size: 1rem;
}

.credit-item:first-child {
  border-bottom: 1px solid rgba(244, 162, 89, 0.2);
  padding-bottom: 15px;
  margin-bottom: 0;
}

.credit-item:last-child {
  padding-top: 0;
  margin-bottom: 0;
}

.credit-label {
  font-weight: 600;
  color: #b5860d;
  min-width: 140px;
}

.credit-value {
  color: #333;
  font-weight: 700;
  font-size: 1.1rem;
}

/* Carbon Credits Info Box */
.carbon-credits__info-box {
  background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
  border-left: 4px solid var(--primary);
  padding: 16px;
  border-radius: 10px;
  margin-bottom: 20px;
}

.carbon-credits__subtitle {
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 10px;
  font-weight: 600;
}

.carbon-credits__explanation {
  font-size: 0.95rem;
  color: var(--text-gray);
  line-height: 1.5;
  margin: 0;
}

/* Comparison Hint */
.comparison__hint {
  background: linear-gradient(135deg, #fff3cd 0%, #fffacd 100%);
  border-left: 4px solid #f4a259;
  border-radius: 8px;
  padding: 14px 16px;
  margin-top: 10px;
  margin-bottom: 20px;
  color: #856404;
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.5;
}

/* Responsive Design */
@media (max-width: 768px) {
  .transport-grid__list {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .calculator {
    padding: 25px;
  }

  .header__title {
    font-size: 1.5rem;
  }

  .calculator__input {
    padding: 10px 12px;
    font-size: 0.95rem;
  }

  .comparison-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .result-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .result-label {
    width: 100%;
  }
}