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

:root {
  --primary: #667eea;
  --primary-dark: #5568d3;
  --secondary: #FF6B35;
  --success: #2ecc71;
  --background: #f8f9fa;
  --surface: #ffffff;
  --text: #2c3e50;
  --text-light: #7f8c8d;
  --border: #e1e8ed;
  --shadow: 0 2px 8px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.15);
  --radius: 12px;
  --radius-lg: 20px;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Utilidades globales */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

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

.btn-ghost {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

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

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1.2rem;
  border-radius: 50px;
}

.card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

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

/* Animaciones */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

.fade-in {
  animation: fadeIn 0.4s ease-out;
}

.slide-in {
  animation: slideIn 0.4s ease-out;
}

/* Responsive */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  .container {
    padding: 0 1rem;
  }
  
  .btn-lg {
    padding: 0.9rem 2rem;
    font-size: 1.1rem;
  }
}

/* Loading states */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

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

/* Focus states */
*:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

/* Scrollbar personalizado */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--background);
}

::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-dark);
}