/* Modern IMC Calculator CSS - 2025 */

:root {
  /* Colors */
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #dbeafe;
  --secondary: #64748b;
  --secondary-hover: #475569;
  --accent: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --success: #22c55e;
  
  /* Neutrals */
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  
  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Typography */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--gray-800);
  background-color: var(--white);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  font-feature-settings: "rlig" 1, "calt" 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* App container */
.app-container {
  width: 100%;
  max-width: 28rem;
  background: var(--white);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--gray-200);
  overflow: hidden;
}

/* Header */
.app-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
  color: var(--white);
  text-align: center;
  padding: var(--space-8) var(--space-6) var(--space-6);
  position: relative;
}

.app-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
  pointer-events: none;
}

.header-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  margin-bottom: var(--space-4);
  backdrop-filter: blur(10px);
}

.header-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
  letter-spacing: -0.025em;
}

.header-subtitle {
  font-size: var(--font-size-sm);
  opacity: 0.9;
  font-weight: 400;
}

/* Main content */
.main-content {
  padding: var(--space-6);
}

/* Form sections */
.form-section {
  margin-bottom: var(--space-8);
}

.form-section:last-child {
  margin-bottom: 0;
}

.section-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: var(--space-4);
  letter-spacing: -0.025em;
}

/* Gender selector */
.gender-selector {
  display: flex;           /* fila */
  gap: 1rem;               /* espacio entre cada opción */
}

/* 3) Ocultar el radio “nativo” */
.gender-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.gender-label {
  flex: 1;                 /* cada label ocupa el mismo ancho */
  display: flex;           /* para centrar vertical u horizontal si quieres */
  align-items: center;
  justify-content: center;
  padding: var(--space-1);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all 0.2s ease;
  background: var(--gray-50);
  text-align: center;
}

.gender-label:hover {
  border-color: var(--primary);
  background: var(--primary-light);
  transform: translateY(-1px);
}

/* 4) Estilo “relleno” cuando está seleccionado */
.gender-input:checked + .gender-label {
  background-color: var(--primary-color);      /* color de fondo */
  border-color:     var(--primary-dark);       /* borde destacado */
  color:            #ffffff;                   /* texto blanco */
}

.gender-icon {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-2);
  font-weight: bold;
}

.gender-icon.male {
  color: var(--primary);
}

.gender-icon.female {
  color: #ec4899;
}

.gender-input:checked + .gender-label {
  background: linear-gradient(135deg, #1a237e 0%, #3f51b5 100%);
  color: #ffffff;
}

/* Input grid */
.input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.input-group {
  display: grid;
  grid-template-columns: max-content 1fr; /* etiqueta “auto” + resto para el wrapper */
  align-items: center;
  column-gap: 1rem;                       /* espacio entre label y wrapper */
  margin-bottom: 1rem;                    /* opcional, separación vertical */
}


.input-group.full-width {
  grid-column: 1 / -1;
}

.input-label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: var(--space-2);
}

.input-container {
  display: flex;
  align-items: center;
  gap: 0.4rem;           /* espacio entre el campo y “lbs”/“cm” */
}

.input-container .form-input {
  flex: 0.7;               /* crece para rellenar ese 1fr de la grid */
  min-width: 0;          /* importante para que el flex no lo obligue a “romperse” */
  width: auto;           /* anula cualquier width:100% que pudiera venir heredado */
}


.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  padding-right: 3rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  transition: all var(--transition-normal);
  background: var(--white);
}

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

.form-input:hover {
  border-color: var(--gray-300);
}



/* Toggle switch */
.toggle-container {
  display: flex;
  align-items: center;
  justify-content: center;
}

.toggle-label {
  display: flex;
  align-items: center;
  cursor: pointer;
  gap: var(--space-3);
}

.toggle-input {
  display: none;
}

.toggle-slider {
  position: relative;
  width: 3rem;
  height: 1.5rem;
  background: var(--gray-300);
  border-radius: 0.75rem;
  transition: all var(--transition-normal);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 1.25rem;
  height: 1.25rem;
  background: var(--white);
  border-radius: 50%;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.toggle-input:checked + .toggle-slider {
  background: var(--primary);
}

.toggle-input:checked + .toggle-slider::before {
  transform: translateX(1.5rem);
}

.toggle-text {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--gray-700);
}

/* Buttons */
.form-actions {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  min-height: 2.75rem;
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--white);
  color: var(--gray-700);
  border-color: var(--gray-300);
}

.btn-secondary:hover {
  background: var(--gray-50);
  border-color: var(--gray-400);
  transform: translateY(-1px);
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Results panel */
.results-panel {
  margin-top: var(--space-8);
  padding: var(--space-6);
  background: var(--gray-50);
  border-radius: var(--radius-xl);
  border: 1px solid var(--gray-200);
  animation: slideUp 0.4s ease-out;
}

.results-header {
  text-align: center;
  margin-bottom: var(--space-6);
}

.results-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--gray-800);
}

.results-content {
  display: grid;
  gap: var(--space-4);
}

.result-card {
  background: var(--white);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  text-align: center;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.result-label {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  margin-bottom: var(--space-2);
  font-weight: 500;
}

.result-value {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--space-1);
}

.result-category,
.result-status {
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  display: inline-block;
}

/* Result status colors */
.status-excellent {
  color: var(--success);
  background: rgba(34, 197, 94, 0.1);
}

.status-good {
  color: var(--accent);
  background: rgba(16, 185, 129, 0.1);
}

.status-normal {
  color: var(--primary);
  background: var(--primary-light);
}

.status-warning {
  color: var(--warning);
  background: rgba(245, 158, 11, 0.1);
}

.status-danger {
  color: var(--danger);
  background: rgba(239, 68, 68, 0.1);
}

/* Detailed results */
.detailed-results {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--gray-200);
}

.detailed-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: var(--space-4);
}

.detailed-content {
  display: grid;
  gap: var(--space-3);
}

/* Footer */
.app-footer {
  padding: var(--space-4) var(--space-6);
  background: var(--gray-50);
  border-top: 1px solid var(--gray-200);
  text-align: center;
}

.footer-text {
  font-size: var(--font-size-xs);
  color: var(--gray-500);
  font-style: italic;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 28rem;
  width: 100%;
  max-height: 90vh;
  overflow: hidden;
  animation: modalEnter 0.3s ease-out;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6);
  border-bottom: 1px solid var(--gray-200);
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--gray-800);
}

.modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: none;
  background: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--gray-500);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--gray-100);
  color: var(--gray-700);
}

.modal-body {
  padding: var(--space-6);
  max-height: 60vh;
  overflow-y: auto;
}

.modal-footer {
  padding: var(--space-6);
  border-top: 1px solid var(--gray-200);
  display: flex;
  justify-content: flex-end;
}

/* Utility classes */
.hidden {
  display: none;
}

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

/* Animations */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(1rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes modalEnter {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes shake {
  0%, 20%, 40%, 60%, 80% {
    transform: translateX(0);
  }
  10%, 30%, 50%, 70%, 90% {
    transform: translateX(-3px);
  }
}

.shake {
  animation: shake 0.5s ease-in-out;
}

/* Responsive design */
@media (max-width: 640px) {
  body {
    padding: var(--space-2);
  }
  
  .app-header {
    padding: var(--space-6) var(--space-4) var(--space-4);
  }
  
  .main-content {
    padding: var(--space-4);
  }
  
  .input-grid {
    grid-template-columns: 1fr;
  }
  
  .form-actions {
    grid-template-columns: 1fr;
  }
  
  .gender-selector {
    grid-template-columns: 1fr;
  }
  
  .modal-content {
    margin: var(--space-4);
    max-height: calc(100vh - 2rem);
  }
  
  .results-panel {
    padding: var(--space-4);
  }
}

/* Focus styles for accessibility */
.btn:focus-visible,
.form-input:focus-visible,
.gender-label:focus-visible,
.toggle-label:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

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

.result-value.passed {
  color: #22c55e; /* Verde */
}

.result-value.failed {
  color: #ef4444; /* Rojo */
}