/* ═══════════════════════════════════════════════════════
   CALCULADORA DE CASHBACK — Meu Posto
   Modern minimalist design with clean aesthetics
   ═══════════════════════════════════════════════════════ */

/* ── Design tokens ── */
:root {
  /* Color palette */
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;

  --secondary: #06b6d4;
  --secondary-light: #22d3ee;
  --secondary-dark: #0891b2;

  --success: #10b981;
  --success-light: #34d399;
  --success-dark: #059669;

  --warning: #f59e0b;
  --warning-light: #fbbf24;
  --warning-dark: #d97706;

  --danger: #ef4444;
  --danger-light: #f87171;
  --danger-dark: #dc2626;

  /* Background colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;

  /* Text colors */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #64748b;
  --text-quaternary: #94a3b8;

  /* Border colors */
  --border-primary: #e2e8f0;
  --border-secondary: #cbd5e1;
  --border-tertiary: #e2e8f0;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Reset & base ── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background: var(--bg-secondary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Background effects ── */
.bg-gradient {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 100%);
  z-index: -2;
}

.bg-pattern {
  position: fixed;
  inset: 0;
  opacity: 0.03;
  background-image:
    radial-gradient(circle at 20% 50%, var(--primary) 0, transparent 50%),
    radial-gradient(circle at 80% 80%, var(--secondary) 0, transparent 50%),
    radial-gradient(circle at 40% 20%, var(--success) 0, transparent 50%);
  z-index: -1;
}

/* ── Container ── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ── Header ── */
.header {
  padding: var(--space-3xl) 0 var(--space-xl);
  text-align: center;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.brand-icon {
  width: 48px;
  height: 48px;
  background: var(--primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
}

.brand-text {
  text-align: left;
}

.brand-name {
  display: block;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.025em;
}

.brand-tagline {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.header-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  font-weight: 400;
  max-width: 600px;
  margin: 0 auto;
}

/* ── Calculator layout ── */
.calculator {
  margin-bottom: var(--space-3xl);
}

.calculator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
}

/* ── Section styles ── */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.section-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  background: var(--primary);
  color: white;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── Input styles ── */
.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.input-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.input-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.label-icon {
  font-size: 1.125rem;
}

.input-wrapper {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  display: flex;
  align-items: center;
  transition: var(--transition-normal);
}

.input-wrapper:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  font-family: inherit;
}

.input::-webkit-outer-spin-button,
.input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.input-unit {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-tertiary);
  margin-left: var(--space-sm);
}

.input-description {
  font-size: 0.75rem;
  color: var(--text-quaternary);
  margin: 0;
}

/* ── Expandable sections ── */
.expandable-section {
  margin-bottom: var(--space-lg);
}

.expand-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-normal);
  font-family: inherit;
}

.expand-toggle:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-secondary);
}

.toggle-icon {
  font-size: 1.125rem;
}

.toggle-text {
  flex: 1;
  text-align: left;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.toggle-arrow {
  font-size: 0.75rem;
  color: var(--text-quaternary);
  transition: transform var(--transition-normal);
}

.expand-toggle[aria-expanded="true"] .toggle-arrow {
  transform: rotate(180deg);
}

.expandable-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, opacity 0.3s ease;
  opacity: 0;
}

.expandable-content.open {
  max-height: 500px;
  opacity: 1;
  margin-top: var(--space-md);
}

.input-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

/* ── Calculate button ── */
.calculate-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 100%;
  padding: var(--space-lg);
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.calculate-button:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.calculate-button:active {
  transform: translateY(0);
}

.button-icon {
  font-size: 1.25rem;
  transition: transform var(--transition-normal);
}

.calculate-button:hover .button-icon {
  transform: translateX(4px);
}

/* ── Results section ── */
.results-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: var(--transition-normal);
}

.metric-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.metric-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.metric-icon {
  font-size: 1.25rem;
}

.metric-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.metric-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  line-height: 1.2;
}

.primary-metric .metric-value {
  color: var(--primary);
}

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

.metric-description {
  font-size: 0.75rem;
  color: var(--text-quaternary);
  margin: 0;
}

/* ── Breakdown card ── */
.breakdown-card,
.comparison-card {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.breakdown-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.breakdown-icon {
  font-size: 1.125rem;
}

.breakdown-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.breakdown-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border-tertiary);
}

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

.breakdown-item.divider {
  padding-top: var(--space-md);
  margin-top: var(--space-xs);
  border-top: 2px dashed var(--border-tertiary);
}

.breakdown-item.positive {
  color: var(--success);
}

.breakdown-item.total {
  font-weight: 700;
  color: var(--primary);
  padding-top: var(--space-md);
  margin-top: var(--space-xs);
  border-top: 2px solid var(--border-primary);
}

.breakdown-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.breakdown-value {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

/* ── Comparison bars ── */
.comparison-bars {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.comparison-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.comparison-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex: 0 0 120px;
}

.comparison-icon {
  font-size: 1.125rem;
}

.bar-background {
  flex: 1;
  height: 32px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: var(--radius-sm);
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  min-width: 4px;
}

.bar-fill::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: inherit;
  filter: brightness(1.2);
}

.bar-desconto {
  background: linear-gradient(90deg, var(--warning), var(--warning-light));
}

.bar-cashback {
  background: linear-gradient(90deg, var(--success), var(--success-light));
}

.bar-value {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  min-width: 80px;
  text-align: right;
}

/* ── Animations ── */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.metric-card {
  animation: slideIn 0.5s ease forwards;
}

.metric-card:nth-child(1) { animation-delay: 0.1s; }
.metric-card:nth-child(2) { animation-delay: 0.2s; }
.metric-card:nth-child(3) { animation-delay: 0.3s; }
.metric-card:nth-child(4) { animation-delay: 0.4s; }

@keyframes pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.metric-card.pop {
  animation: pop 0.3s ease;
}

/* ── Footer ── */
.footer {
  padding: var(--space-xl) 0;
  text-align: center;
  border-top: 1px solid var(--border-primary);
}

.footer p {
  font-size: 0.875rem;
  color: var(--text-quaternary);
}

/* ═══════════════════════════════════════════════════════
   RESPONSIVE DESIGN
   ═══════════════════════════════════════════════════════ */

@media (max-width: 1024px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .metrics-grid {
    grid-template-columns: 1fr;
  }

  .input-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-md);
  }

  .header {
    padding: var(--space-2xl) 0 var(--space-lg);
  }

  .section-title {
    font-size: 1.25rem;
  }

  .metric-value {
    font-size: 1.5rem;
  }

  .comparison-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .comparison-label {
    flex: 1;
    width: 100%;
  }

  .bar-background {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .header {
    padding: var(--space-xl) 0;
  }

  .brand-icon {
    width: 40px;
    height: 40px;
  }

  .brand-name {
    font-size: 1.125rem;
  }

  .section-title {
    font-size: 1.125rem;
  }

  .metric-card,
  .breakdown-card,
  .comparison-card {
    padding: var(--space-md);
  }

  .input {
    font-size: 1rem;
  }

  .metric-value {
    font-size: 1.25rem;
  }
}