/* Reset moderno y variables CSS */
:root {
  /* Colores principales */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-secondary: #64748b;
  --color-accent: #f59e0b;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-bg: #ffffff;
  --color-bg-light: #f8fafc;
  --color-border: #e2e8f0;
  
  /* Tipografía */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --font-size-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --font-size-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --font-size-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
  --font-size-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --font-size-2xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --font-size-3xl: clamp(1.875rem, 1.5rem + 1.875vw, 2.5rem);
  --font-size-4xl: clamp(2.25rem, 1.8rem + 2.25vw, 3rem);
  
  /* Espaciado */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  
  /* Breakpoints */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  
  /* Transiciones */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Tipografía */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin-bottom: var(--space-sm);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover, a:focus {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Imágenes responsivas */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Skip link para accesibilidad */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: white;
  padding: 8px;
  text-decoration: none;
  z-index: 1000;
  border-radius: 4px;
}

.skip-link:focus {
  top: 6px;
}

/* Layout principal */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-sm);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--space-md);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-lg);
  }
}

/* Header */
.header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) 0;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
}

/* Navegación */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: var(--font-size-lg);
  cursor: pointer;
  padding: var(--space-xs);
  color: var(--color-text);
}

.nav-toggle:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
}

.nav-menu a {
  font-weight: 500;
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}

.nav-menu a:hover,
.nav-menu a:focus {
  color: var(--color-primary-dark);
  text-decoration: none;
}

/* Mobile navigation */
@media (max-width: 767px) {
  .nav-toggle {
    display: block;
  }
  
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-sm);
    gap: var(--space-sm);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }
  
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-menu a {
    padding: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
  }
  
  .nav-menu a:last-child {
    border-bottom: none;
  }
}

/* Main content */
.main {
  min-height: calc(100vh - 200px);
}

/* Sections */
.section {
  padding: var(--space-xl) 0;
}

.section--hero {
  background: linear-gradient(135deg, var(--color-bg-light) 0%, var(--color-bg) 100%);
  padding: var(--space-2xl) 0;
}

.section--light {
  background: var(--color-bg-light);
}

/* Grid layouts */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid--2 {
  grid-template-columns: 1fr;
}

.grid--3 {
  grid-template-columns: 1fr;
}

.grid--4 {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .grid--4 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Cards */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-lg);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.card__image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 4px;
  margin-bottom: var(--space-sm);
}

.card__title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xs);
}

.card__text {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px; /* Accesibilidad táctil */
}

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

.btn--primary:hover,
.btn--primary:focus {
  background: var(--color-primary-dark);
  color: white;
  text-decoration: none;
}

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

.btn--secondary:hover,
.btn--secondary:focus {
  background: var(--color-primary);
  color: white;
  text-decoration: none;
}

.btn--large {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-base);
}

/* Forms */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--space-sm);
  border: 2px solid var(--color-border);
  border-radius: 6px;
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast);
  min-height: 44px; /* Accesibilidad táctil */
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-error {
  color: #dc2626;
  font-size: var(--font-size-xs);
  margin-top: var(--space-xs);
}

.form-input.error,
.form-textarea.error,
.form-select.error {
  border-color: #dc2626;
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.1);
}

/* Notificación de error global */
.error-notification {
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 8px;
  padding: var(--space-md);
  margin-bottom: var(--space-lg);
}

.error-notification-content {
  color: #dc2626;
  font-size: var(--font-size-sm);
  line-height: 1.5;
}

.error-notification-content strong {
  display: block;
  margin-bottom: var(--space-xs);
  font-weight: 600;
}

/* Footer */
.footer {
  background: var(--color-text);
  color: white;
  padding: var(--space-xl) 0 var(--space-lg);
  margin-top: var(--space-2xl);
}

.footer-content {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .footer-content {
    grid-template-columns: repeat(3, 1fr);
  }
}

.footer-section h3 {
  color: white;
  margin-bottom: var(--space-sm);
}

.footer-section a {
  color: #cbd5e1;
}

.footer-section a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid #374151;
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  text-align: center;
  color: #9ca3af;
  font-size: var(--font-size-sm);
}

/* Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.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;
}

/* Animaciones suaves */
@media (prefers-reduced-motion: no-preference) {
  .fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  
  .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Print styles */
@media print {
  .header,
  .footer,
  .btn {
    display: none;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.4;
  }
  
  h1, h2, h3 {
    page-break-after: avoid;
  }
}