/* Reset e variáveis CSS */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #3b82f6;
  --secondary-color: #f8fafc;
  --accent-color: #10b981;
  --success-color: #059669;
  --text-color: #1f2937;
  --text-light: #6b7280;
  --border-color: #e5e7eb;
  --shadow: 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);
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --gradient-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-card: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

/* Tipografia */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--gradient-bg);
  min-height: 100vh;
  color: var(--text-color);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Container principal */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 3rem;
  animation: fadeInUp 0.8s ease-out;
}

.header h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: white;
  margin-bottom: 1rem;
  text-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.header h1 i {
  font-size: 0.8em;
  animation: pulse 2s infinite;
}

.header p {
  font-size: clamp(1rem, 3vw, 1.2rem);
  color: rgba(255, 255, 255, 0.9);
  max-width: 700px;
  margin: 0 auto;
  font-weight: 300;
}

/* Grid de calculadoras */
.calculator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

/* Cards das calculadoras */
.calculator-card {
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transition: var(--transition);
  animation: fadeInUp 0.8s ease-out;
  animation-fill-mode: both;
  position: relative;
}

.calculator-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-card);
  transform: scaleX(0);
  transition: var(--transition);
}

.calculator-card:hover::before {
  transform: scaleX(1);
}

.calculator-card:nth-child(1) { animation-delay: 0.1s; }
.calculator-card:nth-child(2) { animation-delay: 0.2s; }
.calculator-card:nth-child(3) { animation-delay: 0.3s; }
.calculator-card:nth-child(4) { animation-delay: 0.4s; }
.calculator-card:nth-child(5) { animation-delay: 0.5s; }

.calculator-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Header do card */
.card-header {
  background: var(--gradient-card);
  color: white;
  padding: 2rem 1.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.card-header::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  transform: scale(0);
  transition: var(--transition);
}

.card-header:hover::before {
  transform: scale(1);
}

.card-header i {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: block;
  opacity: 0.9;
  animation: float 3s ease-in-out infinite;
}

.card-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0;
}

/* Corpo do card */
.card-body {
  padding: 2rem 1.5rem;
}

/* Grupos de input */
.input-group {
  margin-bottom: 1.5rem;
  position: relative;
}

.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.input-group label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
  color: var(--text-color);
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.input-group label i {
  color: var(--primary-color);
  font-size: 0.9rem;
}

.input-group input {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  font-size: 1rem;
  transition: var(--transition);
  background: white;
}

.input-group input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
  transform: translateY(-1px);
}

.input-group input:hover {
  border-color: var(--primary-light);
}

/* Botões */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  border: none;
  border-radius: var(--border-radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  position: relative;
  overflow: hidden;
  width: 100%;
  margin-top: 0.5rem;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: var(--transition);
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--gradient-card);
  color: white;
  box-shadow: var(--shadow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Resultados */
.resultado {
  margin-top: 1.5rem;
  padding: 1rem;
  background: linear-gradient(135deg, var(--accent-color), var(--success-color));
  color: white;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  text-align: center;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  box-shadow: var(--shadow);
}

.resultado.show {
  opacity: 1;
  transform: translateY(0);
}

.resultado i {
  margin-right: 0.5rem;
}

/* Footer */
.footer {
  text-align: center;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9rem;
  padding: 2rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer p {
  margin-bottom: 0.5rem;
}

/* Animações */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

/* Responsividade */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
  
  .calculator-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .input-row {
    grid-template-columns: 1fr;
  }
  
  .card-body {
    padding: 1.5rem 1rem;
  }
  
  .card-header {
    padding: 1.5rem 1rem;
  }
  
  .btn {
    padding: 0.875rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .header h1 {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .calculator-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

/* Estados de loading */
.loading {
  position: relative;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Melhorias de acessibilidade */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Scrollbar personalizada */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.1);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.3);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.5);
}