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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Accesibilidad: clase para ocultar visualmente pero mantener accesible para lectores de pantalla */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Accesibilidad: Skip link para navegación por teclado */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: #667eea;
  color: white;
  padding: 8px 16px;
  text-decoration: none;
  font-weight: 600;
  border-radius: 0 0 4px 0;
  z-index: 10000;
  transition: top 0.3s;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid #ffd700;
  outline-offset: 2px;
}

.App {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

/* Mejorar contraste para accesibilidad */
.App-header {
  background: linear-gradient(135deg, #5568d3 0%, #6941a3 100%);
  color: white;
  padding: 2rem 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.app-logo {
  font-size: 3rem;
  animation: float 3s ease-in-out infinite;
}

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

.App-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin: 0;
}

.subtitle {
  font-size: 1.1rem;
  opacity: 0.95;
  margin: 0;
  padding-left: 4rem;
}

.subtitle a:hover, .subtitle a:focus, .subtitle a:active, .subtitle a:visited {
  color:white;
  text-decoration: none;
}

.App-main {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.controls-section {
  width: 100%;
}

.catalog-section {
  flex: 1;
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.App-footer {
  background: #2c3e50;
  color: white;
  padding: 1rem 1.5rem;
  text-align: center;
  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
}

.App-footer p {
  margin: 0;
  font-size: 0.95rem;
}

.App-footer a {
  color: #8fa3ff;
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s ease;
}

.App-footer a:hover,
.App-footer a:focus {
  color: #b5c7ff;
  text-decoration: underline;
  outline: 2px solid #8fa3ff;
  outline-offset: 2px;
}

.share-toast {
  position: fixed;
  top: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: #4caf50;
  color: white;
  padding: 1rem 2rem;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  font-weight: 600;
  z-index: 1002;
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

@media (max-width: 768px) {
  .App-header {
    padding: 1.5rem 1rem;
  }
  
  .logo-section {
    gap: 0.75rem;
  }
  
  .app-logo {
    font-size: 2rem;
  }
  
  .App-header h1 {
    font-size: 1.8rem;
  }
  
  .subtitle {
    font-size: 0.95rem;
    padding-left: 2.75rem;
  }
  
  .subtitle a:hover, .subtitle a:focus, .subtitle a:active, .subtitle a:visited {
    color:white;
    text-decoration: none;
  }

  .App-main {
    padding: 1rem;
    gap: 1rem;
  }
  
  .catalog-section {
    padding: 1rem;
  }
  
  .App-footer p {
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  .logo-section {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  
  .subtitle {
    padding-left: 0;
  }
}