/* ============================================
   INSTITUTO EVEREST — DESIGN SYSTEM
   ============================================ */

:root {
  /* Colores institucionales */
  --everest-blue: #112f55;
  --everest-blue-dark: #0A2240;
  --everest-blue-darker: #06182E;
  --everest-blue-light: #1E4A8A;
  --everest-blue-lighter: #3D6DAB;
  --everest-blue-50: #EEF3FB;

  --everest-gold: #F5B800;
  --everest-gold-light: #FFD449;
  --everest-gold-dark: #C99800;
  --everest-gold-50: #FFF8E1;

  --everest-white: #FFFFFF;
  --everest-gray-50: #F8F9FB;
  --everest-gray-100: #F1F3F7;
  --everest-gray-200: #E5E7EB;
  --everest-gray-300: #D1D5DB;
  --everest-gray-400: #9CA3AF;
  --everest-gray-500: #6B7280;
  --everest-gray-600: #4B5563;
  --everest-gray-700: #374151;
  --everest-gray-800: #1F2937;
  --everest-gray-900: #111827;

  --everest-success: #10B981;
  --everest-success-dark: #059669;
  --everest-error: #EF4444;
  --everest-warning: #F59E0B;
  --everest-info: #3B82F6;

  --everest-whatsapp: #25D366;
  --everest-whatsapp-dark: #128C7E;

  /* Tipografía */
  --font-display: 'Red Hat Display', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  /* Escala tipográfica (fluid) */
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.25rem;
  --fs-2xl: clamp(1.5rem, 1.2rem + 1.5vw, 2rem);
  --fs-3xl: clamp(1.875rem, 1.5rem + 1.875vw, 2.5rem);
  --fs-4xl: clamp(2.25rem, 1.75rem + 2.5vw, 3.25rem);
  --fs-5xl: clamp(2.75rem, 2rem + 3.75vw, 4.25rem);
  --fs-6xl: clamp(3.25rem, 2.25rem + 5vw, 5.5rem);

  /* Espaciado (8pt grid) */
  --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;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  --space-40: 10rem;

  /* Radios */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-3xl: 2rem;
  --radius-full: 9999px;

  /* Sombras */
  --shadow-sm: 0 1px 2px 0 rgba(17, 47, 85, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(17, 47, 85, 0.08), 0 2px 4px -1px rgba(17, 47, 85, 0.04);
  --shadow-lg: 0 10px 25px -3px rgba(17, 47, 85, 0.10), 0 4px 6px -2px rgba(17, 47, 85, 0.05);
  --shadow-xl: 0 20px 40px -5px rgba(17, 47, 85, 0.15), 0 10px 15px -5px rgba(17, 47, 85, 0.08);
  --shadow-2xl: 0 25px 50px -12px rgba(17, 47, 85, 0.25);
  --shadow-gold: 0 10px 25px -3px rgba(245, 184, 0, 0.25);
  --shadow-blue: 0 10px 25px -3px rgba(17, 47, 85, 0.25);

  /* Transiciones */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-in-out-quart: cubic-bezier(0.76, 0, 0.24, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  --transition-fast: 150ms var(--ease-out-quart);
  --transition-base: 250ms var(--ease-out-quart);
  --transition-slow: 400ms var(--ease-out-expo);
  --transition-spring: 500ms var(--ease-spring);

  /* Layout */
  --container-max: 1280px;
  --container-padding: clamp(1rem, 4vw, 2.5rem);
  --header-height: 88px;
  --header-height-scrolled: 64px;

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-header: 300;
  --z-modal: 1000;
  --z-toast: 2000;
  --z-tooltip: 3000;
}

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

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

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--everest-gray-800);
  background-color: var(--everest-white);
  overflow-x: hidden;
  min-height: 100vh;
}

img, svg, video {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  font-size: inherit;
  color: inherit;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

ul, ol { list-style: none; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--everest-gray-900);
  letter-spacing: -0.02em;
}

h1 { font-size: var(--fs-5xl); font-weight: 900; }
h2 { font-size: var(--fs-4xl); }
h3 { font-size: var(--fs-3xl); }
h4 { font-size: var(--fs-2xl); }

p { line-height: 1.7; }

/* ============================================
   UTILIDADES
   ============================================ */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
  width: 100%;
}

.section {
  padding-block: clamp(4rem, 8vw, 8rem);
  position: relative;
}

.section--alt {
  background-color: var(--everest-gray-50);
}

.section--dark {
  background-color: var(--everest-blue);
  color: var(--everest-white);
}

.section--dark h1, .section--dark h2, .section--dark h3, .section--dark h4 {
  color: var(--everest-white);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--everest-gold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
}

.eyebrow::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--everest-gold);
}

.section--dark .eyebrow { color: var(--everest-gold-light); }

.text-gold { color: var(--everest-gold); }
.text-blue { color: var(--everest-blue); }
.text-white { color: var(--everest-white); }

.text-center { text-align: center; }
.text-balance { text-wrap: balance; }
.text-pretty { text-wrap: pretty; }

.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;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  z-index: var(--z-tooltip);
  padding: var(--space-3) var(--space-6);
  background: var(--everest-blue);
  color: var(--everest-white);
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: top var(--transition-base);
}

.skip-link:focus { top: var(--space-4); }

.divider {
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--everest-blue), var(--everest-gold));
  border-radius: var(--radius-full);
  margin-block: var(--space-6);
}

.divider--center { margin-inline: auto; }

/* ============================================
   BOTONES
   ============================================ */
.btn {
  --btn-bg: var(--everest-blue);
  --btn-color: var(--everest-white);
  --btn-border: var(--everest-blue);
  --btn-hover-bg: var(--everest-white);
  --btn-hover-color: var(--everest-blue);
  --btn-hover-border: var(--everest-blue);

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.875rem 1.75rem;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  font-weight: 600;
  line-height: 1;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  background-color: var(--btn-bg);
  color: var(--btn-color);
  border: 2px solid var(--btn-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
  position: relative;
  z-index: 1;
}

.btn:hover {
  background-color: var(--btn-hover-bg);
  color: var(--btn-hover-color);
  border-color: var(--btn-hover-border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-blue);
}

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

.btn--primary {
  --btn-bg: var(--everest-blue);
  --btn-color: var(--everest-white);
  --btn-border: var(--everest-blue);
  --btn-hover-bg: var(--everest-white);
  --btn-hover-color: var(--everest-blue);
  --btn-hover-border: var(--everest-blue);
}

.btn--gold {
  --btn-bg: var(--everest-gold);
  --btn-color: var(--everest-blue-darker);
  --btn-border: var(--everest-gold);
  --btn-hover-bg: var(--everest-gold-light);
  --btn-hover-color: var(--everest-blue-darker);
  --btn-hover-border: var(--everest-gold);
}

.btn--gold:hover { box-shadow: var(--shadow-gold); }

.btn--whatsapp {
  --btn-bg: var(--everest-whatsapp);
  --btn-color: var(--everest-white);
  --btn-border: var(--everest-whatsapp);
  --btn-hover-bg: var(--everest-whatsapp-dark);
  --btn-hover-color: var(--everest-white);
  --btn-hover-border: var(--everest-whatsapp-dark);
}

.btn--whatsapp:hover { box-shadow: 0 10px 25px -3px rgba(37, 211, 102, 0.4); }

.btn--outline {
  --btn-bg: transparent;
  --btn-color: var(--everest-blue);
  --btn-border: var(--everest-blue);
  --btn-hover-bg: var(--everest-blue);
  --btn-hover-color: var(--everest-white);
  --btn-hover-border: var(--everest-blue);
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-color: var(--everest-white);
  --btn-border: rgba(255, 255, 255, 0.5);
  --btn-hover-bg: var(--everest-white);
  --btn-hover-color: var(--everest-blue);
  --btn-hover-border: var(--everest-white);
}

.btn--lg { padding: 1.125rem 2.25rem; font-size: var(--fs-lg); }
.btn--sm { padding: 0.625rem 1.25rem; font-size: var(--fs-sm); }

.btn .icon { width: 1.25em; height: 1.25em; flex-shrink: 0; }

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

/* ============================================
   FORMS
   ============================================ */
.form-field {
  position: relative;
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--everest-gray-700);
  margin-bottom: var(--space-2);
}

.form-control,
.form-select {
  width: 100%;
  padding: 0.875rem 1rem;
  font-size: var(--fs-base);
  font-family: var(--font-body);
  color: var(--everest-gray-900);
  background-color: var(--everest-white);
  border: 2px solid var(--everest-gray-200);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  appearance: none;
  -webkit-appearance: none;
}

.form-control:focus,
.form-select:focus {
  outline: none;
  border-color: var(--everest-blue);
  box-shadow: 0 0 0 4px rgba(17, 47, 85, 0.1);
}

.form-control::placeholder { color: var(--everest-gray-400); }

.form-control:invalid:not(:placeholder-shown) { border-color: var(--everest-error); }
.form-control:valid:not(:placeholder-shown) { border-color: var(--everest-success); }

.form-select {
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23112f55' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1.25rem;
  padding-right: 2.75rem;
  cursor: pointer;
}

.form-help {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--fs-xs);
  color: var(--everest-gray-500);
}

.form-error {
  display: none;
  margin-top: var(--space-2);
  font-size: var(--fs-xs);
  color: var(--everest-error);
  font-weight: 500;
}

.form-field.error .form-error { display: block; }
.form-field.error .form-control,
.form-field.error .form-select { border-color: var(--everest-error); }

/* Floating label */
.form-floating {
  position: relative;
}

.form-floating .form-control {
  padding-top: 1.5rem;
  padding-bottom: 0.5rem;
}

.form-floating .form-select {
  padding-top: 1.5rem;
  padding-bottom: 0.5rem;
}

.form-floating .form-label {
  position: absolute;
  top: 0.875rem;
  left: 1rem;
  font-size: var(--fs-base);
  color: var(--everest-gray-500);
  pointer-events: none;
  transition: all var(--transition-base);
  margin: 0;
  font-weight: 400;
  background: transparent;
  z-index: 1;
}

.form-floating .form-control:focus ~ .form-label,
.form-floating .form-control:not(:placeholder-shown) ~ .form-label,
.form-floating .form-select:focus ~ .form-label,
.form-floating .form-select:not([value=""]) ~ .form-label,
.form-floating .form-select:valid ~ .form-label {
  top: 0.25rem;
  left: 1rem;
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--everest-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Static label that does not animate (used when no floating behavior is desired) */
.form-label--static {
  position: static !important;
  display: block;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--everest-gray-700);
  margin-bottom: var(--space-2);
  pointer-events: auto;
  text-transform: none;
  letter-spacing: 0;
}

/* Checkbox */
.form-check {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-block: var(--space-4);
  cursor: pointer;
}

.form-check input[type="checkbox"] {
  width: 20px;
  height: 20px;
  margin-top: 2px;
  accent-color: var(--everest-blue);
  cursor: pointer;
  flex-shrink: 0;
}

.form-check label {
  font-size: var(--fs-sm);
  color: var(--everest-gray-600);
  cursor: pointer;
  line-height: 1.5;
}

.form-check a { color: var(--everest-blue); text-decoration: underline; }

/* ============================================
   CARDS
   ============================================ */
.card {
  background-color: var(--everest-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-slow);
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.card__image {
  aspect-ratio: 16/10;
  overflow: hidden;
  position: relative;
  background: linear-gradient(135deg, var(--everest-blue-50), var(--everest-gold-50));
}

.card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.card:hover .card__image img { transform: scale(1.05); }

.card__badge {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  padding: 0.375rem 0.875rem;
  background: var(--everest-gold);
  color: var(--everest-blue-darker);
  font-size: var(--fs-xs);
  font-weight: 700;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  z-index: 2;
}

.card__body {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card__category {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--everest-blue);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-2);
}

.card__title {
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--everest-gray-900);
  margin-bottom: var(--space-3);
  line-height: 1.3;
}

.card__title a { color: inherit; }
.card__title a:hover { color: var(--everest-blue); }

.card__excerpt {
  color: var(--everest-gray-600);
  font-size: var(--fs-sm);
  line-height: 1.6;
  margin-bottom: var(--space-4);
  flex: 1;
}

.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-top: var(--space-4);
  border-top: 1px solid var(--everest-gray-200);
  font-size: var(--fs-xs);
  color: var(--everest-gray-500);
}

.card__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.card__meta-item svg {
  width: 16px;
  height: 16px;
  color: var(--everest-blue);
}

.card__footer {
  padding: var(--space-4) var(--space-6);
  background: var(--everest-gray-50);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--everest-gray-200);
}

.card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--everest-blue);
  font-weight: 600;
  font-size: var(--fs-sm);
  transition: gap var(--transition-base);
}

.card__link:hover { gap: var(--space-3); }

/* Card variants */
.card--program {
  border: 1px solid var(--everest-gray-200);
}

.card--dark {
  background: linear-gradient(135deg, var(--everest-blue-dark), var(--everest-blue));
  color: var(--everest-white);
}

.card--dark .card__title { color: var(--everest-white); }
.card--dark .card__excerpt { color: rgba(255, 255, 255, 0.85); }
.card--dark .card__meta { color: rgba(255, 255, 255, 0.7); border-top-color: rgba(255, 255, 255, 0.1); }

/* ============================================
   BADGES
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.25rem 0.75rem;
  font-size: var(--fs-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  background: var(--everest-blue-50);
  color: var(--everest-blue);
}

.badge--gold { background: var(--everest-gold-50); color: var(--everest-gold-dark); }
.badge--success { background: rgba(16, 185, 129, 0.1); color: var(--everest-success-dark); }
.badge--urgente { background: rgba(239, 68, 68, 0.1); color: var(--everest-error); }
.badge--nuevo { background: rgba(245, 184, 0, 0.15); color: var(--everest-gold-dark); }

/* ============================================
   GRID
   ============================================ */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.grid--programs {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

@media (min-width: 1024px) {
  .grid--programs { grid-template-columns: repeat(3, 1fr); }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes pulseRing {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 15px rgba(37, 211, 102, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(37, 211, 102, 0); }
}

@keyframes kenburns {
  0% { transform: scale(1) translate(0, 0); }
  100% { transform: scale(1.1) translate(-2%, 2%); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

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

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger > * {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--ease-out-expo), transform 0.6s var(--ease-out-expo);
}

.reveal-stagger.is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger.is-visible > *:nth-child(2) { transition-delay: 100ms; }
.reveal-stagger.is-visible > *:nth-child(3) { transition-delay: 200ms; }
.reveal-stagger.is-visible > *:nth-child(4) { transition-delay: 300ms; }
.reveal-stagger.is-visible > *:nth-child(5) { transition-delay: 400ms; }
.reveal-stagger.is-visible > *:nth-child(6) { transition-delay: 500ms; }

@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;
  }
  .reveal, .reveal-stagger > * { opacity: 1; transform: none; }
}