/**
 * Universidad Libre - Seccional Cartagena
 * Cartilla Interactiva PEP - Administración de Empresas
 * Base Styles, CSS Reset, Typography, Layout Containers
 */

/* Google Fonts Import: Montserrat with weights from 300 to 900 */

/* ==========================================================================
   Modern CSS Reset & Box Sizing
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-normal);
  color: var(--color-unilibre-charcoal);
  background-color: var(--color-unilibre-bg-light);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* ==========================================================================
   Media Elements Reset
   ========================================================================== */
img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

svg {
  flex-shrink: 0;
}

/* ==========================================================================
   Typography Rules
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  font-weight: var(--font-weight-extrabold);
  line-height: var(--line-height-tight);
  color: var(--color-unilibre-charcoal);
  letter-spacing: var(--letter-spacing-tight);
}

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-md);
}

p {
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-md);
}

p:last-child {
  margin-bottom: 0;
}

strong, b {
  font-weight: var(--font-weight-bold);
  color: var(--color-unilibre-charcoal);
}

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

a:hover {
  color: var(--color-unilibre-red-hover);
  text-decoration: underline;
}

ul, ol {
  list-style-position: inside;
  margin-bottom: var(--space-md);
}

li {
  margin-bottom: var(--space-xs);
  line-height: var(--line-height-normal);
}

blockquote {
  border-left: 4px solid var(--color-unilibre-red);
  padding: var(--space-sm) var(--space-md);
  margin: var(--space-md) 0;
  background-color: var(--color-unilibre-red-alpha10);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
}

code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   Interactive & Form Elements
   ========================================================================== */
button {
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  border: none;
  background: transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  transition: all var(--transition-fast);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

input, select, textarea {
  font-family: var(--font-primary);
  font-size: var(--font-size-md);
  color: var(--color-unilibre-charcoal);
  border: 1.5px solid var(--color-unilibre-gray-light);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-unilibre-white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  width: 100%;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-unilibre-red);
  box-shadow: 0 0 0 3px var(--color-unilibre-red-alpha20);
}

/* Accessible focus ring for keyboard navigation */
:focus-visible {
  outline: 2.5px solid var(--color-unilibre-gold);
  outline-offset: 3px;
}

/* ==========================================================================
   Application Layout Containers
   ========================================================================== */
.booklet-app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  width: 100%;
  max-width: var(--booklet-max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  position: relative;
}

.booklet-shell {
  background-color: var(--color-unilibre-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-booklet);
  overflow: hidden;
  margin: var(--space-lg) 0;
  display: flex;
  flex-direction: column;
  min-height: var(--booklet-min-height);
  position: relative;
  border: 1px solid var(--color-unilibre-gray-lighter);
}

.booklet-content-area {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
}

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

.text-unilibre-red {
  color: var(--color-unilibre-red) !important;
}

.text-unilibre-gold {
  color: var(--color-unilibre-gold) !important;
}

.text-muted {
  color: var(--color-unilibre-gray-medium) !important;
}

.text-center {
  text-align: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: var(--space-2xs) var(--space-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
}

.badge-red {
  background-color: var(--color-unilibre-red-alpha10);
  color: var(--color-unilibre-red);
}

.badge-gold {
  background-color: var(--color-unilibre-gold-alpha15);
  color: var(--color-unilibre-gold-hover);
}

/* ==========================================================================
   Accessibility & Media Queries
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (max-width: 1024px) {
  :root {
    --booklet-min-height: auto;
  }

  .booklet-app-container {
    padding: 0 var(--space-xs);
  }

  .booklet-shell {
    margin: var(--space-sm) 0;
    border-radius: var(--radius-md);
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  h1 {
    font-size: var(--font-size-3xl);
  }

  h2 {
    font-size: var(--font-size-2xl);
  }
}