/* ==========================================================================
   SCROLL TIMELINE CSS - Demo específico
   PARTE 1: Base y Layout Principal
   
   NOTA: Este archivo asume que main.css ya está cargado con:
   - Variables CSS (colores, spacing, tipografía)
   - Reset y estilos base
   - Container y utilidades
   - Theme toggle JS ya está en theme-toggle.js
   ========================================================================== */

/* ==========================================================================
   DEMO HEADER Y NAVEGACIÓN
   ========================================================================== */

.demo-header {
  background: var(--background);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(10px);
  padding: var(--spacing-lg) 0;
}

.demo-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-lg);
}

.back-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-fast);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  border: 1px solid transparent;
}

.back-link:hover {
  color: var(--primary-color);
  background: color-mix(in srgb, var(--primary-color) 8%, transparent);
  border-color: var(--primary-color);
  transform: translateX(-2px);
}

.back-link svg {
  transition: transform var(--transition-fast);
}

.back-link:hover svg {
  transform: translateX(-2px);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.brand-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-logo img {
  width: 60px;
  height: 60px;
  object-fit: contain;
  filter: drop-shadow(0 2px 4px color-mix(in srgb, var(--primary-color) 20%, transparent));
  transition: transform var(--transition-normal);
}

.brand-logo:hover img {
  transform: scale(1.05);
}

.brand-name {
  font-weight: 600;
  color: var(--text-primary);
  font-size: var(--font-size-base);
}

/* ==========================================================================
   THEME TOGGLE (Estilos visuales - la lógica está en theme-toggle.js)
   ========================================================================== */

.theme-toggle {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--surface);
  border: 2px solid var(--border-color);
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition-normal);
  overflow: hidden;
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--primary-color);
  border-color: var(--primary-color);
  transform: scale(1.05);
  box-shadow: 0 8px 25px color-mix(in srgb, var(--primary-color) 30%, transparent);
}

.theme-toggle:hover .theme-toggle__icon {
  color: var(--brand-white);
}

.theme-toggle:active {
  transform: scale(0.95);
}

.theme-toggle__icon {
  position: absolute;
  width: 18px;
  height: 18px;
  color: var(--text-primary);
  transition: all var(--transition-normal);
  transform-origin: center;
}

:root[data-theme="light"] .theme-toggle__icon--sun,
:root:not([data-theme]) .theme-toggle__icon--sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

:root[data-theme="light"] .theme-toggle__icon--moon,
:root:not([data-theme]) .theme-toggle__icon--moon {
  opacity: 0;
  transform: rotate(180deg) scale(0.5);
}

:root[data-theme="dark"] .theme-toggle__icon--sun {
  opacity: 0;
  transform: rotate(-180deg) scale(0.5);
}

:root[data-theme="dark"] .theme-toggle__icon--moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* ==========================================================================
   SCROLL PROGRESS BAR (STICKY) - CON SCROLL TIMELINE
   ========================================================================== */

.scroll-progress {
  position: fixed;
  top: 85px; /* Debajo del header */
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--border-color);
  z-index: calc(var(--z-sticky) - 1);
  pointer-events: none;
}

.scroll-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transform-origin: left;
  
  /* 🎬 SCROLL TIMELINE ANIMATION */
  animation: progress-grow linear;
  animation-timeline: scroll(root);
  
  box-shadow: 0 0 20px color-mix(in srgb, var(--primary-color) 50%, transparent);
}

@keyframes progress-grow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.scroll-progress-bar::after {
  content: '';
  position: absolute;
  right: 0;
  top: -2px;
  width: 8px;
  height: 8px;
  background: var(--secondary-color);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--secondary-color);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.3);
    opacity: 0.7;
  }
}

/* ==========================================================================
   SECTION TITLES
   ========================================================================== */

.section-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-2xl);
  text-align: center;
  position: relative;
  padding-bottom: var(--spacing-md);
}

.section-title::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}

.section-subtitle {
  display: block;
  font-size: var(--font-size-base);
  font-weight: 400;
  color: var(--text-secondary);
  margin-top: var(--spacing-sm);
}

.section-title--light {
  color: var(--brand-white);
}

.section-title--light .section-subtitle {
  color: color-mix(in srgb, var(--brand-white) 80%, transparent);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.footer {
  background: var(--surface);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-3xl);
}

.footer__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-xl);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.footer__logo {
  flex-shrink: 0;
}

.footer__logo img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  filter: drop-shadow(0 2px 4px color-mix(in srgb, var(--primary-color) 15%, transparent));
}

.footer__info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.footer__text {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin: 0;
}

.footer__author {
  color: var(--primary-color);
  font-weight: 600;
}

.footer__subtitle {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin: 0;
}

.footer__links {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.footer__link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--primary-color);
}

.footer__separator {
  color: var(--text-muted);
}

/* ==========================================================================
   FIN DE PARTE 1
   ========================================================================== */

   /* ==========================================================================
   SCROLL TIMELINE CSS - PARTE 2
   HERO SECTION CON PARALLAX + VISUAL INTERACTIVO CSS PURO
   ========================================================================== */

/* ==========================================================================
   HERO PARALLAX CONTAINER
   ========================================================================== */

.hero-parallax {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--background);
}

/* ==========================================================================
   PARALLAX BACKGROUND
   ========================================================================== */

.hero-parallax-bg {
  position: absolute;
  inset: -20%;
  background: linear-gradient(135deg, 
    color-mix(in srgb, var(--primary-color) 10%, var(--background)) 0%,
    var(--background) 50%,
    color-mix(in srgb, var(--secondary-color) 8%, var(--background)) 100%
  );
  z-index: 0;
  
  /* 🎬 PARALLAX CON SCROLL TIMELINE */
  animation: parallax-bg linear;
  animation-timeline: view();
  animation-range: entry 0% exit 100%;
  
  will-change: transform;
  transform: translateZ(0);
}

@keyframes parallax-bg {
  from {
    transform: translateY(-10%) scale(1.1);
  }
  to {
    transform: translateY(10%) scale(1.1);
  }
}

/* Gradiente overlay */
.hero-parallax-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 80%, 
      color-mix(in srgb, var(--primary-color) 15%, transparent) 0%, 
      transparent 50%
    ),
    radial-gradient(circle at 80% 20%, 
      color-mix(in srgb, var(--secondary-color) 15%, transparent) 0%, 
      transparent 50%
    );
  animation: gradient-shift 8s ease-in-out infinite;
}

@keyframes gradient-shift {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 0.8; }
}

/* ==========================================================================
   VISUAL INTERACTIVO CSS PURO - SCROLL TIMELINE DEMO
   ========================================================================== */

.hero-visual {
  position: absolute;
  right: 10%;
  top: 50%;
  transform: translateY(-50%);
  width: 300px;
  height: 400px;
  z-index: 1;
  pointer-events: none;
}

/* Container del "viewport" visual */
.visual-viewport {
  position: relative;
  width: 100%;
  height: 100%;
  border: 3px solid color-mix(in srgb, var(--primary-color) 30%, transparent);
  border-radius: var(--border-radius-large);
  background: color-mix(in srgb, var(--surface) 50%, transparent);
  backdrop-filter: blur(10px);
  overflow: hidden;
  box-shadow: 
    0 20px 60px color-mix(in srgb, var(--primary-color) 20%, transparent),
    inset 0 0 0 1px color-mix(in srgb, white 10%, transparent);
}

/* Label del viewport */
.visual-viewport::before {
  content: 'Viewport';
  position: absolute;
  top: var(--spacing-sm);
  left: 50%;
  transform: translateX(-50%);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  z-index: 10;
}

/* Track del scroll */
.visual-track {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: color-mix(in srgb, var(--primary-color) 20%, transparent);
  transform: translateX(-50%);
}

/* Elementos que se animan dentro del "viewport" */
.visual-element {
  position: absolute;
  left: 50%;
  width: 80px;
  height: 80px;
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-lg);
  color: var(--brand-white);
  box-shadow: var(--shadow-lg);
  transform: translateX(-50%);
}

/* Elemento 1 - Fade In */
.visual-element:nth-child(2) {
  top: 60px;
  background: linear-gradient(135deg, var(--primary-color), color-mix(in srgb, var(--primary-color) 80%, var(--secondary-color)));
  
  /* 🎬 ANIMACIÓN AUTOMÁTICA AL CARGAR */
  animation: visual-fade-in 2s ease-out 0.5s forwards;
  opacity: 0;
  transform: translateX(-50%) translateY(20px);
}

@keyframes visual-fade-in {
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* Elemento 2 - Scale */
.visual-element:nth-child(3) {
  top: 160px;
  background: linear-gradient(135deg, var(--secondary-color), color-mix(in srgb, var(--secondary-color) 80%, var(--primary-color)));
  
  animation: visual-scale 2s ease-out 1s forwards;
  opacity: 0;
  transform: translateX(-50%) scale(0.5);
}

@keyframes visual-scale {
  to {
    opacity: 1;
    transform: translateX(-50%) scale(1);
  }
}

/* Elemento 3 - Rotate */
.visual-element:nth-child(4) {
  top: 260px;
  background: linear-gradient(135deg, var(--info), color-mix(in srgb, var(--info) 80%, var(--primary-color)));
  
  animation: visual-rotate 2s ease-out 1.5s forwards;
  opacity: 0;
  transform: translateX(-50%) rotateY(-90deg);
}

@keyframes visual-rotate {
  to {
    opacity: 1;
    transform: translateX(-50%) rotateY(0deg);
  }
}

/* Indicador de scroll en el visual */
.visual-scroll-indicator {
  position: absolute;
  bottom: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--text-muted);
  font-size: var(--font-size-xs);
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-5px); }
}

.visual-scroll-indicator::after {
  content: '';
  width: 2px;
  height: 20px;
  background: linear-gradient(to bottom, var(--primary-color), transparent);
}

/* Labels de los elementos */
.visual-element::before {
  content: attr(data-label);
  position: absolute;
  bottom: -30px;
  left: 50%;
  transform: translateX(-50%);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  font-weight: 600;
  white-space: nowrap;
}

/* Progress indicator en el track */
.visual-progress {
  position: absolute;
  left: 50%;
  top: 0;
  width: 8px;
  height: 8px;
  background: var(--secondary-color);
  border-radius: 50%;
  transform: translateX(-50%);
  box-shadow: 0 0 20px var(--secondary-color);
  
  /* Se mueve automáticamente */
  animation: visual-progress-move 3s ease-in-out infinite;
}

@keyframes visual-progress-move {
  0%, 100% { 
    top: 40px; 
  }
  50% { 
    top: calc(100% - 60px); 
  }
}

/* ==========================================================================
   HERO CONTENT
   ========================================================================== */

.hero-content {
  position: relative;
  z-index: 2;
  padding: var(--spacing-3xl) 0;
  max-width: 50%; /* Dejar espacio para el visual */
}

.hero-content .demo-hero {
  animation: hero-fade-in linear;
  animation-timeline: view();
  animation-range: entry 0% cover 30%;
  opacity: 0;
  transform: translateY(30px);
}

@keyframes hero-fade-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   DEMO HERO ELEMENTS
   ========================================================================== */

.demo-hero {
  text-align: left; /* Cambio a left por el visual a la derecha */
  position: relative;
  z-index: 2;
}

.demo-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  animation: badge-slide linear;
  animation-timeline: view();
  animation-range: entry 0% cover 20%;
  opacity: 0;
  transform: translateY(-20px);
}

@keyframes badge-slide {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.badge-text {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.badge-tag {
  background: var(--secondary-color);
  color: var(--text-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: relative;
  overflow: hidden;
}

.badge-tag::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    color-mix(in srgb, white 30%, transparent),
    transparent
  );
  animation: shine 3s ease-in-out infinite;
}

@keyframes shine {
  0% { left: -100%; }
  50%, 100% { left: 100%; }
}

.demo-hero__title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
  animation: title-reveal linear;
  animation-timeline: view();
  animation-range: entry 0% cover 25%;
  opacity: 0;
  transform: scale(0.95);
}

@keyframes title-reveal {
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.title-highlight {
  display: block;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 900;
  margin-top: var(--spacing-sm);
  animation: gradient-flow 3s ease-in-out infinite;
}

@keyframes gradient-flow {
  0%, 100% { background-position: 0% center; }
  50% { background-position: 100% center; }
}

.demo-hero__description {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 600px;
  margin-bottom: var(--spacing-2xl);
  animation: description-fade linear;
  animation-timeline: view();
  animation-range: entry 5% cover 30%;
  opacity: 0;
  transform: translateY(20px);
}

@keyframes description-fade {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.demo-hero__features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--spacing-md);
  max-width: 600px;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, 
    color-mix(in srgb, var(--primary-color) 5%, transparent),
    color-mix(in srgb, var(--secondary-color) 5%, transparent)
  );
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px color-mix(in srgb, var(--primary-color) 20%, transparent);
  border-color: var(--primary-color);
}

.feature-item:hover::before {
  opacity: 1;
}

.feature-item:hover .feature-icon {
  transform: scale(1.2) rotate(5deg);
}

.feature-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  transition: transform var(--transition-normal);
}

.feature-text {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  text-align: left;
}

.feature-text strong {
  color: var(--text-primary);
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.feature-text span {
  color: var(--text-muted);
  font-size: var(--font-size-xs);
}

/* Stagger en features */
.demo-hero__features .feature-item:nth-child(1) {
  animation: feature-reveal linear;
  animation-timeline: view();
  animation-range: entry 0% cover 30%;
  opacity: 0;
  transform: translateY(30px);
}

.demo-hero__features .feature-item:nth-child(2) {
  animation: feature-reveal linear;
  animation-timeline: view();
  animation-range: entry 5% cover 35%;
  opacity: 0;
  transform: translateY(30px);
}

.demo-hero__features .feature-item:nth-child(3) {
  animation: feature-reveal linear;
  animation-timeline: view();
  animation-range: entry 10% cover 40%;
  opacity: 0;
  transform: translateY(30px);
}

@keyframes feature-reveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   RESPONSIVE HERO
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-visual {
    right: 5%;
    width: 250px;
    height: 350px;
  }
  
  .hero-content {
    max-width: 55%;
  }
}

@media (max-width: 768px) {
  .hero-parallax {
    min-height: auto;
    padding: var(--spacing-3xl) 0;
  }
  
  .hero-visual {
    position: relative;
    right: auto;
    top: auto;
    transform: none;
    margin: 0 auto var(--spacing-2xl);
    width: 200px;
    height: 280px;
  }
  
  .hero-content {
    max-width: 100%;
  }
  
  .demo-hero {
    text-align: center;
  }
  
  .demo-hero__title {
    font-size: var(--font-size-2xl);
  }
  
  .demo-hero__features {
    grid-template-columns: 1fr;
    max-width: 100%;
  }
  
  .demo-hero__description {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .hero-visual {
    width: 180px;
    height: 240px;
  }
  
  .visual-element {
    width: 60px;
    height: 60px;
    font-size: var(--font-size-base);
  }
  
  .demo-hero__title {
    font-size: var(--font-size-xl);
  }
}

/* ==========================================================================
   ACCESSIBILITY - REDUCED MOTION
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  .hero-parallax-bg,
  .hero-content .demo-hero,
  .demo-hero__badge,
  .demo-hero__title,
  .demo-hero__description,
  .demo-hero__features .feature-item,
  .visual-element,
  .visual-progress {
    opacity: 1;
    transform: none;
    animation: none;
  }
  
  .visual-scroll-indicator {
    animation: none;
  }
}

/* ==========================================================================
   FIN DE PARTE 2
   ========================================================================== */

/* ==========================================================================
   HERO FEATURES CON STAGGER EFFECT
   ========================================================================== */

/* Cada feature aparece con delay escalonado */
.demo-hero__features .feature-item:nth-child(1) {
  animation: feature-reveal linear;
  animation-timeline: view();
  animation-range: entry 0% cover 30%;
  opacity: 0;
  transform: translateY(30px);
}

.demo-hero__features .feature-item:nth-child(2) {
  animation: feature-reveal linear;
  animation-timeline: view();
  animation-range: entry 5% cover 35%;
  opacity: 0;
  transform: translateY(30px);
}

.demo-hero__features .feature-item:nth-child(3) {
  animation: feature-reveal linear;
  animation-timeline: view();
  animation-range: entry 10% cover 40%;
  opacity: 0;
  transform: translateY(30px);
}

@keyframes feature-reveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Hover effect mejorado para features */
.feature-item {
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, 
    color-mix(in srgb, var(--primary-color) 5%, transparent),
    color-mix(in srgb, var(--secondary-color) 5%, transparent)
  );
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px color-mix(in srgb, var(--primary-color) 20%, transparent);
  border-color: var(--primary-color);
}

.feature-item:hover::before {
  opacity: 1;
}

.feature-item:hover .feature-icon {
  transform: scale(1.2) rotate(5deg);
  transition: transform var(--transition-normal);
}

/* ==========================================================================
   BADGE ANIMATIONS
   ========================================================================== */

.demo-hero__badge {
  /* 🎬 SLIDE FROM TOP */
  animation: badge-slide linear;
  animation-timeline: view();
  animation-range: entry 0% cover 20%;
  opacity: 0;
  transform: translateY(-20px);
}

@keyframes badge-slide {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Badge tag con efecto shine */
.badge-tag {
  position: relative;
  overflow: hidden;
}

.badge-tag::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    color-mix(in srgb, white 30%, transparent),
    transparent
  );
  animation: shine 3s ease-in-out infinite;
}

@keyframes shine {
  0% {
    left: -100%;
  }
  50%, 100% {
    left: 100%;
  }
}

/* ==========================================================================
   TITLE ANIMATIONS
   ========================================================================== */

.demo-hero__title {
  /* 🎬 SCALE + FADE */
  animation: title-reveal linear;
  animation-timeline: view();
  animation-range: entry 0% cover 25%;
  opacity: 0;
  transform: scale(0.95);
}

@keyframes title-reveal {
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Gradient text animation */
.title-highlight {
  background-size: 200% auto;
  animation: gradient-flow 3s ease-in-out infinite;
}

@keyframes gradient-flow {
  0%, 100% {
    background-position: 0% center;
  }
  50% {
    background-position: 100% center;
  }
}

/* ==========================================================================
   DESCRIPTION ANIMATION
   ========================================================================== */

.demo-hero__description {
  /* 🎬 FADE IN DELAYED */
  animation: description-fade linear;
  animation-timeline: view();
  animation-range: entry 5% cover 30%;
  opacity: 0;
  transform: translateY(20px);
}

@keyframes description-fade {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   SCROLL INDICATOR (opcional - aparece al inicio)
   ========================================================================== */

.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-2xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  z-index: 3;
  
  /* Desaparece al scrollear */
  animation: scroll-indicator-fade linear;
  animation-timeline: scroll(root);
  opacity: 1;
}

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

.scroll-indicator::after {
  content: '';
  width: 2px;
  height: 30px;
  background: linear-gradient(
    to bottom,
    var(--primary-color),
    transparent
  );
  animation: scroll-line 2s ease-in-out infinite;
}

@keyframes scroll-line {
  0%, 100% {
    transform: scaleY(1);
    opacity: 1;
  }
  50% {
    transform: scaleY(0.5);
    opacity: 0.5;
  }
}

/* ==========================================================================
   RESPONSIVE HERO PARALLAX
   ========================================================================== */

@media (max-width: 768px) {
  .hero-parallax {
    min-height: 80vh;
  }
  
  .hero-parallax-bg {
    inset: -10%; /* Menos movimiento en móvil */
  }
  
  .demo-hero__title {
    font-size: var(--font-size-2xl);
  }
  
  .demo-hero__features {
    grid-template-columns: 1fr;
  }
  
  /* Simplificar animaciones en móvil */
  .hero-parallax-bg::after {
    animation-duration: 30s;
  }
}

@media (max-width: 480px) {
  .hero-parallax {
    min-height: 70vh;
  }
  
  .demo-hero__title {
    font-size: var(--font-size-xl);
  }
  
  .demo-hero__description {
    font-size: var(--font-size-base);
  }
}

/* ==========================================================================
   PERFORMANCE OPTIMIZATIONS ESPECÍFICAS DEL HERO
   ========================================================================== */

/* Will-change solo en elementos animados */
.hero-parallax-bg {
  will-change: transform;
}

/* Remover will-change después de la animación (con JS o dejar que el navegador decida) */
.hero-content.animated-in .demo-hero {
  will-change: auto;
}

/* Contain para aislar el hero */
.hero-parallax {
  contain: layout paint;
}

/* ==========================================================================
   ACCESSIBILITY - REDUCED MOTION
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  .hero-parallax-bg {
    animation: none;
    transform: none;
  }
  
  .hero-parallax-bg::before,
  .hero-parallax-bg::after {
    animation: none;
  }
  
  .scroll-indicator::after {
    animation: none;
  }
  
  .title-highlight {
    animation: none;
  }
  
  .badge-tag::before {
    animation: none;
  }
  
  /* Mostrar contenido inmediatamente */
  .hero-content .demo-hero,
  .demo-hero__badge,
  .demo-hero__title,
  .demo-hero__description,
  .demo-hero__features .feature-item {
    opacity: 1;
    transform: none;
    animation: none;
  }
}

/* ==========================================================================
   DARK MODE ADJUSTMENTS
   ========================================================================== */

:root[data-theme="dark"] .hero-parallax-bg {
  background: linear-gradient(135deg, 
    color-mix(in srgb, var(--primary-color) 8%, var(--background)) 0%,
    var(--background) 50%,
    color-mix(in srgb, var(--secondary-color) 6%, var(--background)) 100%
  );
}

:root[data-theme="dark"] .hero-parallax-bg::before {
  background: 
    radial-gradient(circle at 20% 80%, 
      color-mix(in srgb, var(--primary-color) 20%, transparent) 0%, 
      transparent 50%
    ),
    radial-gradient(circle at 80% 20%, 
      color-mix(in srgb, var(--secondary-color) 20%, transparent) 0%, 
      transparent 50%
    );
}

/* ==========================================================================
   FIN DE PARTE 2
   ========================================================================== */

   /* ==========================================================================
   SCROLL TIMELINE CSS - PARTE 3
   TIMELINE TYPES + SECCIONES BASE
   ========================================================================== */

/* ==========================================================================
   DEMO MAIN
   ========================================================================== */

.demo-main {
  padding-top: var(--spacing-2xl);
}

/* Espaciado entre secciones */
section {
  margin-bottom: var(--spacing-3xl);
}

/* ==========================================================================
   TIMELINE TYPES SECTION
   ========================================================================== */

.timeline-types-section {
  padding: var(--spacing-3xl) 0;
}

.timeline-types-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

/* ==========================================================================
   TIMELINE TYPE CARDS
   ========================================================================== */

.timeline-type-card {
  background: var(--surface);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-large);
  padding: var(--spacing-2xl);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  
  /* 🎬 ANIMACIÓN AL ENTRAR AL VIEWPORT */
  animation: card-fade-in linear forwards; /* ← forwards mantiene el estado final */
  animation-timeline: view();
  animation-range: entry 0% cover 30%;
  opacity: 0;
  transform: translateY(50px);
}

@keyframes card-fade-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.timeline-type-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.timeline-type-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.timeline-type-card:hover::before {
  transform: scaleX(1);
}

/* Stagger effect para cada card */
.timeline-type-card:nth-child(1) {
  animation-range: entry 0% cover 30%;
}

.timeline-type-card:nth-child(2) {
  animation-range: entry 5% cover 35%;
}

.timeline-type-card:nth-child(3) {
  animation-range: entry 10% cover 40%;
}

/* ==========================================================================
   TIMELINE TYPE CARD ELEMENTS
   ========================================================================== */

.timeline-type-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-lg);
  display: inline-block;
  transition: transform var(--transition-normal);
}

.timeline-type-card:hover .timeline-type-icon {
  transform: scale(1.1) rotate(5deg);
}

.timeline-type-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
}

.timeline-type-description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.timeline-type-code {
  display: block;
  background: var(--background);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  font-size: var(--font-size-xs);
  color: var(--primary-color);
  border: 1px solid var(--border-color);
  overflow-x: auto;
  margin-top: auto;
}

/* ==========================================================================
   SECTION EXPLANATION (componente reutilizable)
   ========================================================================== */

.section-explanation {
  margin-top: var(--spacing-2xl);
  padding: var(--spacing-xl);
  background: color-mix(in srgb, var(--primary-color) 5%, var(--surface));
  border-left: 4px solid var(--primary-color);
  border-radius: var(--border-radius);
}

.section-explanation h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.section-explanation p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.section-explanation code {
  background: var(--background);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: calc(var(--border-radius) / 2);
  font-size: var(--font-size-xs);
  color: var(--primary-color);
  font-weight: 600;
}

.section-explanation:last-child p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   CODE SNIPPET (reutilizable para pre > code)
   ========================================================================== */

.code-snippet {
  background: var(--background);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  overflow-x: auto;
  margin-top: var(--spacing-md);
}

.code-snippet code {
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  font-size: var(--font-size-sm);
  line-height: 1.6;
  color: var(--text-primary);
  background: none;
  padding: 0;
}

/* ==========================================================================
   DEMO HERO ELEMENTS (para hero section)
   ========================================================================== */

.demo-hero {
  text-align: center;
  position: relative;
  z-index: 2;
}

.demo-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.badge-text {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.badge-tag {
  background: var(--secondary-color);
  color: var(--text-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.demo-hero__title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
}

.title-highlight {
  display: block;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 900;
  margin-top: var(--spacing-sm);
}

.demo-hero__description {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 800px;
  margin: 0 auto var(--spacing-2xl);
}

.demo-hero__features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  max-width: 600px;
  margin: 0 auto;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
}

.feature-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.feature-text {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  text-align: left;
}

.feature-text strong {
  color: var(--text-primary);
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.feature-text span {
  color: var(--text-muted);
  font-size: var(--font-size-xs);
}

/* ==========================================================================
   PERFORMANCE OPTIMIZATIONS
   ========================================================================== */

/* Contain para aislar layouts */
.timeline-type-card {
  contain: layout paint;
}

/* Will-change solo en elementos animados */
.timeline-type-card {
  will-change: transform, opacity;
}

/* ==========================================================================
   RESPONSIVE - TIMELINE TYPES
   ========================================================================== */

@media (max-width: 768px) {
  .timeline-types-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .timeline-type-card {
    padding: var(--spacing-xl);
  }
  
  .timeline-type-icon {
    font-size: 2.5rem;
  }
}

@media (max-width: 480px) {
  .timeline-type-card {
    padding: var(--spacing-lg);
  }
  
  .timeline-type-icon {
    font-size: 2rem;
  }
  
  .timeline-type-title {
    font-size: var(--font-size-lg);
  }
}

/* ==========================================================================
   ACCESSIBILITY - REDUCED MOTION
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  .timeline-type-card {
    opacity: 1;
    transform: none;
    animation: none;
  }
  
  .timeline-type-card:hover {
    transform: none;
  }
  
  .timeline-type-icon {
    transition: none;
  }
}

/* ==========================================================================
   DARK MODE ADJUSTMENTS
   ========================================================================== */

:root[data-theme="dark"] .timeline-type-card {
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  border-color: color-mix(in srgb, var(--border-color) 50%, transparent);
}

:root[data-theme="dark"] .timeline-type-card:hover {
  border-color: var(--primary-color);
  background: var(--surface);
}

:root[data-theme="dark"] .section-explanation {
  background: color-mix(in srgb, var(--primary-color) 8%, var(--surface));
}

/* ==========================================================================
   FIN DE PARTE 3
   ========================================================================== */

   /* ==========================================================================
   SCROLL TIMELINE CSS - PARTE 4
   CARDS REVEAL SECTION - 6 DIFERENTES ANIMACIONES
   ========================================================================== */

/* ==========================================================================
   CARDS REVEAL SECTION
   ========================================================================== */

.cards-reveal-section {
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(180deg, 
    var(--background) 0%, 
    color-mix(in srgb, var(--primary-color) 2%, var(--background)) 100%
  );
}

/* ==========================================================================
   CARDS GRID
   ========================================================================== */

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

/* ==========================================================================
   REVEAL CARD BASE
   ========================================================================== */

.reveal-card {
  background: var(--surface);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-large);
  padding: var(--spacing-2xl);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  min-height: 280px;
  
  /* Performance */
  contain: layout paint;
  will-change: transform, opacity;
}

.reveal-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, 
    color-mix(in srgb, var(--primary-color) 5%, transparent),
    color-mix(in srgb, var(--secondary-color) 5%, transparent)
  );
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.reveal-card:hover {
  border-color: var(--primary-color);
  box-shadow: 
    0 20px 40px color-mix(in srgb, var(--primary-color) 15%, transparent),
    0 0 0 1px color-mix(in srgb, var(--primary-color) 20%, transparent);
}

.reveal-card:hover::before {
  opacity: 1;
}

/* ==========================================================================
   CARD ELEMENTS
   ========================================================================== */

.card-icon {
  font-size: 3rem;
  transition: transform var(--transition-normal);
}

.reveal-card:hover .card-icon {
  transform: scale(1.15) rotate(5deg);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.card-description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
  margin: 0;
}

.card-code {
  display: block;
  background: var(--background);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  font-size: var(--font-size-xs);
  color: var(--primary-color);
  border: 1px solid var(--border-color);
  overflow-x: auto;
  white-space: nowrap;
  margin-top: auto;
}

/* ==========================================================================
   CARD 1: FADE IN
   ========================================================================== */

.reveal-card:nth-child(1) {
  /* 🎬 FADE IN CON VIEW TIMELINE */
  animation: reveal-fade-in linear forwards;
  animation-timeline: view();
  animation-range: entry 0% cover 40%;
  opacity: 0;
  transform: translateY(50px);
}

@keyframes reveal-fade-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   CARD 2: SCALE UP
   ========================================================================== */

.reveal-card:nth-child(2) {
  /* 🎬 SCALE FROM CENTER */
  animation: reveal-scale linear forwards;
  animation-timeline: view();
  animation-range: entry 5% cover 45%;
  opacity: 0;
  transform: scale(0.8);
}

@keyframes reveal-scale {
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ==========================================================================
   CARD 3: ROTATE IN
   ========================================================================== */

.reveal-card:nth-child(3) {
  /* 🎬 ROTATE Y AXIS */
  animation: reveal-rotate linear forwards;
  animation-timeline: view();
  animation-range: entry 10% cover 50%;
  opacity: 0;
  transform: perspective(1000px) rotateY(-15deg);
  transform-style: preserve-3d;
}

@keyframes reveal-rotate {
  to {
    opacity: 1;
    transform: perspective(1000px) rotateY(0deg);
  }
}

/* ==========================================================================
   CARD 4: BLUR FOCUS
   ========================================================================== */

.reveal-card:nth-child(4) {
  /* 🎬 BLUR TO FOCUS */
  animation: reveal-blur linear forwards;
  animation-timeline: view();
  animation-range: entry 0% cover 40%;
  opacity: 0;
  filter: blur(10px);
  transform: translateY(30px);
}

@keyframes reveal-blur {
  to {
    opacity: 1;
    filter: blur(0);
    transform: translateY(0);
  }
}

/* ==========================================================================
   CARD 5: SLIDE LEFT
   ========================================================================== */

.reveal-card:nth-child(5) {
  /* 🎬 SLIDE FROM RIGHT */
  animation: reveal-slide-left linear forwards;
  animation-timeline: view();
  animation-range: entry 5% cover 45%;
  opacity: 0;
  transform: translateX(100px);
}

@keyframes reveal-slide-left {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ==========================================================================
   CARD 6: CLIP REVEAL
   ========================================================================== */

.reveal-card:nth-child(6) {
  /* 🎬 CLIP PATH REVEAL */
  animation: reveal-clip linear forwards;
  animation-timeline: view();
  animation-range: entry 10% cover 50%;
  clip-path: inset(0 100% 0 0);
}

@keyframes reveal-clip {
  to {
    clip-path: inset(0 0 0 0);
  }
}

/* Efecto adicional para el icono de la card 6 */
.reveal-card:nth-child(6) .card-icon {
  animation: icon-fade-in linear forwards;
  animation-timeline: view();
  animation-range: entry 15% cover 55%;
  opacity: 0;
}

@keyframes icon-fade-in {
  to {
    opacity: 1;
  }
}

/* ==========================================================================
   ALTERNATIVE: Si quieres que todas usen el mismo timing
   Descomenta esto y comenta los rangos individuales arriba
   ========================================================================== */

/*
.reveal-card {
  animation-range: entry 0% cover 40%;
}

.reveal-card:nth-child(odd) {
  animation-range: entry 0% cover 35%;
}

.reveal-card:nth-child(even) {
  animation-range: entry 5% cover 40%;
}
*/

/* ==========================================================================
   HOVER EFFECTS MEJORADOS
   ========================================================================== */

.reveal-card:hover {
  transform: translateY(-8px) scale(1.02);
}

/* Mantener transformaciones específicas en hover */
.reveal-card:nth-child(1):hover {
  transform: translateY(-8px);
}

.reveal-card:nth-child(2):hover {
  transform: scale(1.05);
}

.reveal-card:nth-child(3):hover {
  transform: perspective(1000px) rotateY(2deg) scale(1.02);
}

.reveal-card:nth-child(4):hover {
  transform: translateY(-8px);
}

.reveal-card:nth-child(5):hover {
  transform: translateX(-4px);
}

.reveal-card:nth-child(6):hover {
  transform: translateY(-8px);
}

/* ==========================================================================
   RESPONSIVE - CARDS GRID
   ========================================================================== */

@media (max-width: 1024px) {
  .cards-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
  }
}

@media (max-width: 768px) {
  .cards-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .reveal-card {
    min-height: 240px;
    padding: var(--spacing-xl);
  }
  
  .card-icon {
    font-size: 2.5rem;
  }
  
  /* Simplificar animaciones en móvil */
  .reveal-card:nth-child(n) {
    animation-range: entry 0% cover 30%;
  }
}

@media (max-width: 480px) {
  .reveal-card {
    min-height: auto;
    padding: var(--spacing-lg);
  }
  
  .card-icon {
    font-size: 2rem;
  }
  
  .card-title {
    font-size: var(--font-size-lg);
  }
}

/* ==========================================================================
   ACCESSIBILITY - REDUCED MOTION
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  .reveal-card {
    opacity: 1 !important;
    transform: none !important;
    clip-path: none !important;
    filter: none !important;
    animation: none !important;
  }
  
  .reveal-card:hover {
    transform: none !important;
  }
  
  .reveal-card:nth-child(6) .card-icon {
    opacity: 1 !important;
    animation: none !important;
  }
}

/* ==========================================================================
   DARK MODE ADJUSTMENTS
   ========================================================================== */

:root[data-theme="dark"] .cards-reveal-section {
  background: linear-gradient(180deg, 
    var(--background) 0%, 
    color-mix(in srgb, var(--primary-color) 3%, var(--background)) 100%
  );
}

:root[data-theme="dark"] .reveal-card {
  background: color-mix(in srgb, var(--surface) 90%, transparent);
  border-color: color-mix(in srgb, var(--border-color) 50%, transparent);
}

:root[data-theme="dark"] .reveal-card:hover {
  background: var(--surface);
  border-color: var(--primary-color);
  box-shadow: 
    0 20px 40px color-mix(in srgb, var(--primary-color) 25%, transparent),
    0 0 0 1px color-mix(in srgb, var(--primary-color) 30%, transparent);
}

/* ==========================================================================
   PERFORMANCE HINTS
   ========================================================================== */

/* GPU acceleration para todas las cards */
.reveal-card {
  transform: translateZ(0);
  backface-visibility: hidden;
}

/* Contain para aislar repaints */
.reveal-card {
  contain: layout paint style;
}

/* ==========================================================================
   FIN DE PARTE 4
   ========================================================================== */

/* ==========================================================================
   SCROLL TIMELINE CSS - PARTE 5
   COLOR MORPH + IMAGE REVEAL SECTIONS
   ========================================================================== */

/* ==========================================================================
   COLOR MORPH SECTION
   ========================================================================== */

.color-morph-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3xl) 0;
  position: relative;
  overflow: hidden;
  
  /* 🎬 COLOR CHANGE CON SCROLL TIMELINE */
  background-color: var(--primary-color);
  animation: color-morph-bg linear forwards;
  animation-timeline: view();
  animation-range: entry 0% exit 100%;
  
  /* Performance */
  will-change: background-color;
}

@keyframes color-morph-bg {
  0% {
    background-color: var(--primary-color);
  }
  50% {
    background-color: color-mix(in oklch, var(--primary-color) 50%, var(--secondary-color) 50%);
  }
  100% {
    background-color: var(--secondary-color);
  }
}

/* Overlay pattern para depth */
.color-morph-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 20% 30%, rgba(255,255,255,0.05) 1px, transparent 1px),
    radial-gradient(circle at 80% 70%, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 150px 150px, 200px 200px;
  background-position: 0 0, 40px 60px;
  animation: pattern-float 20s linear infinite;
  pointer-events: none;
}

@keyframes pattern-float {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-100px);
  }
}

/* ==========================================================================
   COLOR MORPH CONTENT
   ========================================================================== */

.color-morph-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  
  /* Fade in al entrar */
  animation: content-fade-in linear forwards;
  animation-timeline: view();
  animation-range: entry 0% cover 30%;
  opacity: 0;
  transform: translateY(30px);
}

@keyframes content-fade-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Section title light variant */
.color-morph-content .section-title {
  color: var(--brand-white);
}

.color-morph-content .section-title::after {
  background: linear-gradient(90deg, 
    rgba(255,255,255,0.8), 
    rgba(255,255,255,0.4)
  );
}

.color-morph-content .section-subtitle {
  color: rgba(255,255,255,0.9);
}

/* ==========================================================================
   COLOR INFO GRID
   ========================================================================== */

.color-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  margin: var(--spacing-2xl) 0;
}

.color-info-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-xl);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: var(--border-radius-large);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all var(--transition-normal);
}

.color-info-item:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
}

/* Color swatches */
.color-swatch {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  box-shadow: 
    0 8px 20px rgba(0, 0, 0, 0.3),
    inset 0 0 0 3px rgba(255, 255, 255, 0.3);
  transition: transform var(--transition-normal);
}

.color-info-item:hover .color-swatch {
  transform: scale(1.1) rotate(5deg);
}

.color-swatch--start {
  background: var(--primary-color);
}

.color-swatch--middle {
  background: color-mix(in oklch, var(--primary-color) 50%, var(--secondary-color) 50%);
}

.color-swatch--end {
  background: var(--secondary-color);
}

.color-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  text-align: center;
}

.color-value {
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.7);
  background: rgba(0, 0, 0, 0.2);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
}

/* ==========================================================================
   COLOR EXPLANATION
   ========================================================================== */

.color-explanation {
  margin-top: var(--spacing-2xl);
  font-size: var(--font-size-base);
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.7;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.color-explanation code {
  background: rgba(0, 0, 0, 0.3);
  color: rgba(255, 255, 255, 0.95);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: calc(var(--border-radius) / 2);
  font-weight: 600;
}

/* ==========================================================================
   IMAGE REVEAL SECTION
   ========================================================================== */

.image-reveal-section {
  padding: var(--spacing-3xl) 0;
  background: var(--background);
}

.image-reveal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-2xl);
}

/* ==========================================================================
   REVEAL IMAGE FIGURE
   ========================================================================== */

.reveal-image {
  position: relative;
  margin: 0;
}

.image-wrapper {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: var(--border-radius-large);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

/* Image placeholder con gradiente */
.image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--brand-white);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  position: relative;
  
  /* Performance */
  contain: layout paint;
}

/* Pattern overlay en placeholder */
.image-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(45deg, rgba(255,255,255,0.1) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255,255,255,0.1) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.1) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.1) 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
  opacity: 0.5;
}

/* ==========================================================================
   IMAGE REVEAL ANIMATIONS
   ========================================================================== */

/* Reveal desde la izquierda */
.reveal-image:nth-child(1) .image-wrapper {
  /* 🎬 CLIP-PATH REVEAL */
  animation: reveal-left linear forwards;
  animation-timeline: view();
  animation-range: entry 0% cover 40%;
  clip-path: inset(0 100% 0 0);
}

@keyframes reveal-left {
  to {
    clip-path: inset(0 0 0 0);
  }
}

/* Reveal desde abajo */
.reveal-image:nth-child(2) .image-wrapper {
  animation: reveal-bottom linear forwards;
  animation-timeline: view();
  animation-range: entry 5% cover 45%;
  clip-path: inset(100% 0 0 0);
}

@keyframes reveal-bottom {
  to {
    clip-path: inset(0 0 0 0);
  }
}

/* Reveal circular */
.reveal-image:nth-child(3) .image-wrapper {
  animation: reveal-circle linear forwards;
  animation-timeline: view();
  animation-range: entry 10% cover 50%;
  clip-path: circle(0% at 50% 50%);
}

@keyframes reveal-circle {
  to {
    clip-path: circle(100% at 50% 50%);
  }
}

/* Fade in adicional para el contenido */
.reveal-image:nth-child(1) .placeholder-text {
  animation: text-fade linear forwards;
  animation-timeline: view();
  animation-range: entry 10% cover 40%;
  opacity: 0;
}

.reveal-image:nth-child(2) .placeholder-text {
  animation: text-fade linear forwards;
  animation-timeline: view();
  animation-range: entry 15% cover 45%;
  opacity: 0;
}

.reveal-image:nth-child(3) .placeholder-text {
  animation: text-fade linear forwards;
  animation-timeline: view();
  animation-range: entry 20% cover 50%;
  opacity: 0;
}

@keyframes text-fade {
  to {
    opacity: 1;
  }
}

/* ==========================================================================
   FIGCAPTION
   ========================================================================== */

figcaption {
  margin-top: var(--spacing-md);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: 500;
  
  /* Fade in */
  animation: caption-fade linear forwards;
  animation-timeline: view();
  animation-range: entry 15% cover 50%;
  opacity: 0;
  transform: translateY(10px);
}

@keyframes caption-fade {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   RESPONSIVE - COLOR MORPH + IMAGE REVEAL
   ========================================================================== */

@media (max-width: 768px) {
  .color-morph-section {
    min-height: 80vh;
    padding: var(--spacing-2xl) 0;
  }
  
  .color-info-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .color-swatch {
    width: 60px;
    height: 60px;
  }
  
  .image-reveal-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .image-wrapper {
    aspect-ratio: 4 / 3;
  }
}

@media (max-width: 480px) {
  .color-morph-section {
    min-height: 70vh;
  }
  
  .color-info-item {
    padding: var(--spacing-lg);
  }
  
  .color-swatch {
    width: 50px;
    height: 50px;
  }
  
  .image-placeholder {
    font-size: var(--font-size-xl);
  }
}

/* ==========================================================================
   ACCESSIBILITY - REDUCED MOTION
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  .color-morph-section {
    animation: none;
    background-color: var(--primary-color);
  }
  
  .color-morph-content,
  .color-info-item,
  .reveal-image .image-wrapper,
  .placeholder-text,
  figcaption {
    opacity: 1;
    transform: none;
    clip-path: none;
    animation: none;
  }
  
  .color-morph-section::before {
    animation: none;
  }
}

/* ==========================================================================
   DARK MODE ADJUSTMENTS
   ========================================================================== */

:root[data-theme="dark"] .color-morph-section {
  /* El color morph mantiene sus colores brand */
}

:root[data-theme="dark"] .color-info-item {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.15);
}

:root[data-theme="dark"] .color-info-item:hover {
  background: rgba(255, 255, 255, 0.12);
}

:root[data-theme="dark"] .image-placeholder {
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.1);
}

/* ==========================================================================
   PERFORMANCE OPTIMIZATIONS
   ========================================================================== */

/* Will-change para color morph */
.color-morph-section {
  will-change: background-color;
}

/* GPU acceleration */
.color-morph-content,
.color-info-item,
.image-wrapper {
  transform: translateZ(0);
  backface-visibility: hidden;
}

/* Contain para aislar */
.color-morph-section {
  contain: layout paint;
}

.image-wrapper {
  contain: layout paint style;
}

/* ==========================================================================
   FIN DE PARTE 5
   ========================================================================== */

/* ==========================================================================
   SCROLL TIMELINE CSS - PARTE 6
   HORIZONTAL GALLERY + CODE EXAMPLES + COMPARISON + USE CASES + 
   RANGE REFERENCE + PROPERTIES + TIPS + RESOURCES
   ========================================================================== */

/* ==========================================================================
   HORIZONTAL SCROLL SECTION
   ========================================================================== */

.horizontal-scroll-section {
  padding: var(--spacing-3xl) 0;
  background: var(--background);
  overflow: hidden;
}

.horizontal-container {
  width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  
  /* Ocultar scrollbar pero mantener funcionalidad */
  scrollbar-width: thin;
  scrollbar-color: var(--primary-color) var(--border-color);
  
  /* Padding para que se vean los bordes */
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-xl);
}

.horizontal-container::-webkit-scrollbar {
  height: 8px;
}

.horizontal-container::-webkit-scrollbar-track {
  background: var(--border-color);
  border-radius: 4px;
}

.horizontal-container::-webkit-scrollbar-thumb {
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: 4px;
}

.horizontal-content {
  display: flex;
  gap: var(--spacing-xl);
  padding: 0 var(--spacing-xl);
  width: max-content;
}

/* ==========================================================================
   GALLERY ITEMS
   ========================================================================== */

.gallery-item {
  flex-shrink: 0;
  width: 300px;
  min-height: 250px;
  background: var(--surface);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-large);
  padding: var(--spacing-2xl);
  scroll-snap-align: center;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  
  /* 🎬 ANIMACIÓN CON VIEW TIMELINE HORIZONTAL */
  animation: gallery-item-reveal linear forwards;
  animation-timeline: view(inline);
  animation-range: entry 0% cover 40%;
  opacity: 0;
  transform: translateX(-30px) scale(0.95);
}

@keyframes gallery-item-reveal {
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

.gallery-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.gallery-item:hover {
  transform: translateY(-8px) scale(1.02);
  border-color: var(--primary-color);
  box-shadow: 
    0 20px 40px color-mix(in srgb, var(--primary-color) 20%, transparent),
    0 0 0 1px color-mix(in srgb, var(--primary-color) 10%, transparent);
}

.gallery-item:hover::before {
  transform: scaleX(1);
}

.item-number {
  font-size: var(--font-size-3xl);
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: var(--spacing-md);
}

.item-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.item-description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ==========================================================================
   CODE EXAMPLES SECTION
   ========================================================================== */

.code-examples-section {
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(180deg,
    var(--background) 0%,
    color-mix(in srgb, var(--primary-color) 3%, var(--background)) 100%
  );
}

.code-examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.code-example-card {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-large);
  overflow: hidden;
  transition: all var(--transition-normal);
  
  /* 🎬 FADE IN AL ENTRAR */
  animation: code-card-reveal linear forwards;
  animation-timeline: view();
  animation-range: entry 0% cover 30%;
  opacity: 0;
  transform: translateY(30px);
}

@keyframes code-card-reveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.code-example-card:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.code-example-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg) var(--spacing-xl);
  background: color-mix(in srgb, var(--primary-color) 5%, var(--surface));
  border-bottom: 1px solid var(--border-color);
}

.code-example-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.code-lang {
  background: var(--primary-color);
  color: var(--brand-white);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
}

.code-example-content {
  padding: var(--spacing-xl);
  margin: 0;
  overflow-x: auto;
  background: var(--background);
  max-height: 400px;
}

.code-example-content code {
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--text-primary);
  background: none;
  padding: 0;
}

/* ==========================================================================
   COMPARISON SECTION (JS vs CSS)
   ========================================================================== */

.comparison-section {
  padding: var(--spacing-3xl) 0;
  background: var(--background);
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-2xl);
}

.comparison-column {
  background: var(--surface);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-large);
  padding: var(--spacing-2xl);
  transition: all var(--transition-normal);
  
  /* 🎬 ANIMACIÓN DE ENTRADA */
  animation: comparison-reveal linear forwards;
  animation-timeline: view();
  animation-range: entry 0% cover 35%;
  opacity: 0;
  transform: translateY(40px);
}

@keyframes comparison-reveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.comparison-column--js {
  border-color: color-mix(in srgb, var(--error) 40%, var(--border-color));
}

.comparison-column--js:hover {
  border-color: var(--error);
  box-shadow: 0 10px 30px color-mix(in srgb, var(--error) 15%, transparent);
}

.comparison-column--css {
  border-color: color-mix(in srgb, var(--success) 40%, var(--border-color));
}

.comparison-column--css:hover {
  border-color: var(--success);
  box-shadow: 0 10px 30px color-mix(in srgb, var(--success) 15%, transparent);
}

.comparison-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 2px solid var(--border-color);
}

.comparison-icon {
  font-size: 2rem;
}

.comparison-header h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.comparison-content h4 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.comparison-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--spacing-xl) 0;
}

.comparison-list li {
  padding: var(--spacing-sm) 0;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.comparison-code-block {
  background: var(--background);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  overflow-x: auto;
  max-height: 300px;
}

.comparison-code-block pre {
  margin: 0;
}

.comparison-code-block code {
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  font-size: var(--font-size-xs);
  line-height: 1.6;
  color: var(--text-primary);
}

/* ==========================================================================
   COMPARISON METRICS
   ========================================================================== */

.comparison-metrics {
  margin-top: var(--spacing-2xl);
  padding: var(--spacing-2xl);
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-large);
  
  /* 🎬 ANIMACIÓN */
  animation: metrics-reveal linear forwards;
  animation-timeline: view();
  animation-range: entry 0% cover 30%;
  opacity: 0;
  transform: scale(0.95);
}

@keyframes metrics-reveal {
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.comparison-metrics h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
}

.metric-item {
  text-align: center;
  padding: var(--spacing-lg);
  background: var(--background);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

.metric-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.metric-values {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
}

.metric-js {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--error);
}

.metric-css {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--success);
}

.metric-separator {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   USE CASES SECTION
   ========================================================================== */

.use-cases-section {
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(180deg,
    var(--background) 0%,
    color-mix(in srgb, var(--secondary-color) 3%, var(--background)) 100%
  );
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.use-case-card {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-large);
  padding: var(--spacing-2xl);
  text-align: center;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  
  /* 🎬 STAGGER ANIMATION */
  animation: use-case-reveal linear forwards;
  animation-timeline: view();
  animation-range: entry 0% cover 35%;
  opacity: 0;
  transform: translateY(40px);
}

@keyframes use-case-reveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Stagger effect */
.use-case-card:nth-child(1) { animation-range: entry 0% cover 30%; }
.use-case-card:nth-child(2) { animation-range: entry 3% cover 33%; }
.use-case-card:nth-child(3) { animation-range: entry 6% cover 36%; }
.use-case-card:nth-child(4) { animation-range: entry 9% cover 39%; }
.use-case-card:nth-child(5) { animation-range: entry 12% cover 42%; }
.use-case-card:nth-child(6) { animation-range: entry 15% cover 45%; }

.use-case-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.use-case-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-lg);
}

.use-case-card:hover::before {
  transform: scaleX(1);
}

.use-case-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-lg);
  display: inline-block;
  transition: transform var(--transition-normal);
}

.use-case-card:hover .use-case-icon {
  transform: scale(1.2) rotate(5deg);
}

.use-case-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.use-case-description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ==========================================================================
   RANGE REFERENCE SECTION
   ========================================================================== */

.range-reference-section {
  padding: var(--spacing-3xl) 0;
  background: var(--background);
}

.range-reference-content {
  margin-top: var(--spacing-2xl);
}

/* Diagrama visual */
.range-diagram {
  background: var(--surface);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-large);
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
  
  /* 🎬 ANIMACIÓN */
  animation: diagram-reveal linear forwards;
  animation-timeline: view();
  animation-range: entry 0% cover 30%;
  opacity: 0;
  transform: scale(0.95);
}

@keyframes diagram-reveal {
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.diagram-viewport {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--brand-white);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  text-align: center;
  font-weight: 700;
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.diagram-label {
  font-size: var(--font-size-lg);
}

.diagram-phases {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
}

.phase-item {
  background: var(--background);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  text-align: center;
  transition: all var(--transition-fast);
}

.phase-item:hover {
  border-color: var(--primary-color);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.phase-label {
  display: block;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-xs);
}

.phase-desc {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.phase-entry { border-top: 4px solid #3b82f6; }
.phase-cover { border-top: 4px solid #8b5cf6; }
.phase-contain { border-top: 4px solid #10b981; }
.phase-exit { border-top: 4px solid #f59e0b; }

/* Range examples */
.range-examples {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-large);
  padding: var(--spacing-2xl);
}

.range-examples h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xl);
}

.range-example-item {
  padding: var(--spacing-lg);
  background: var(--background);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
  border-left: 4px solid var(--primary-color);
}

.range-example-item:last-child {
  margin-bottom: 0;
}

.range-code {
  display: block;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  font-size: var(--font-size-sm);
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  background: none;
  padding: 0;
}

.range-explanation {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ==========================================================================
   PROPERTIES SECTION
   ========================================================================== */

.properties-section {
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(180deg,
    var(--background) 0%,
    color-mix(in srgb, var(--primary-color) 2%, var(--background)) 100%
  );
}

.properties-table {
  margin-top: var(--spacing-2xl);
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-large);
  overflow: hidden;
}

.property-row {
  display: grid;
  grid-template-columns: 200px 1fr 1fr;
  gap: var(--spacing-lg);
  padding: var(--spacing-xl);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-fast);
  
  /* 🎬 ANIMACIÓN */
  animation: property-reveal linear forwards;
  animation-timeline: view();
  animation-range: entry 0% cover 25%;
  opacity: 0;
  transform: translateX(-20px);
}

@keyframes property-reveal {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.property-row:last-child {
  border-bottom: none;
}

.property-row:hover {
  background: color-mix(in srgb, var(--primary-color) 3%, var(--surface));
}

.property-name code {
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--primary-color);
  background: color-mix(in srgb, var(--primary-color) 10%, var(--background));
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
}

.property-description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

.property-description code {
  background: var(--background);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: calc(var(--border-radius) / 2);
  font-size: var(--font-size-xs);
  color: var(--text-primary);
}

.property-example {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.property-example code {
  display: block;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  font-size: var(--font-size-xs);
  color: var(--text-primary);
  background: var(--background);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

/* ==========================================================================
   BROWSER SUPPORT SECTION
   ========================================================================== */

.support-section {
  padding: var(--spacing-3xl) 0;
  background: var(--background);
}

.browser-support {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-2xl) 0;
}

.browser-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--surface);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  
  /* 🎬 ANIMACIÓN */
  animation: browser-reveal linear forwards;
  animation-timeline: view();
  animation-range: entry 0% cover 30%;
  opacity: 0;
  transform: scale(0.9);
}

@keyframes browser-reveal {
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.browser-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.browser-item--supported {
  border-color: color-mix(in srgb, var(--success) 40%, var(--border-color));
}

.browser-item--supported:hover {
  border-color: var(--success);
}

.browser-item--partial {
  border-color: color-mix(in srgb, var(--warning) 40%, var(--border-color));
}

.browser-item--partial:hover {
  border-color: var(--warning);
}

.browser-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.browser-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.browser-info strong {
  color: var(--text-primary);
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.browser-info span {
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
}

/* Support notes */
.support-note,
.support-polyfill {
  background: color-mix(in srgb, var(--info) 8%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--info) 30%, transparent);
  border-left: 4px solid var(--info);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.support-note h3,
.support-polyfill h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.support-note p,
.support-polyfill p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.support-note p:last-child,
.support-polyfill p:last-child {
  margin-bottom: 0;
}

.polyfill-note {
  background: color-mix(in srgb, var(--warning) 10%, var(--background));
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  border: 1px solid color-mix(in srgb, var(--warning) 30%, transparent);
}

/* ==========================================================================
   TIPS SECTION
   ========================================================================== */

.tips-section {
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(180deg,
    var(--background) 0%,
    color-mix(in srgb, var(--success) 3%, var(--background)) 100%
  );
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.tip-card {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-large);
  padding: var(--spacing-2xl);
  position: relative;
  transition: all var(--transition-normal);
  
  /* 🎬 ANIMACIÓN CON STAGGER */
  animation: tip-reveal linear forwards;
  animation-timeline: view();
  opacity: 0;
  transform: translateY(30px);
}

.tip-card:nth-child(1) { animation-range: entry 0% cover 30%; }
.tip-card:nth-child(2) { animation-range: entry 5% cover 35%; }
.tip-card:nth-child(3) { animation-range: entry 10% cover 40%; }
.tip-card:nth-child(4) { animation-range: entry 15% cover 45%; }

@keyframes tip-reveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.tip-card:hover {
  transform: translateY(-8px);
  border-color: var(--success);
  box-shadow: 0 15px 35px color-mix(in srgb, var(--success) 15%, transparent);
}

.tip-number {
  position: absolute;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  font-size: var(--font-size-3xl);
  font-weight: 900;
  color: color-mix(in srgb, var(--primary-color) 15%, transparent);
  line-height: 1;
}

.tip-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  padding-right: var(--spacing-2xl);
}

.tip-description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.tip-description code {
  background: var(--background);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: calc(var(--border-radius) / 2);
  font-size: var(--font-size-xs);
  color: var(--primary-color);
}

.tip-code {
  display: block;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  font-size: var(--font-size-xs);
  color: var(--text-primary);
  background: var(--background);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  margin-bottom: var(--spacing-sm);
}

.tip-code:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   RESOURCES SECTION
   ========================================================================== */

.resources-section {
  padding: var(--spacing-3xl) 0;
  background: var(--background);
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.resource-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--spacing-md);
  padding: var(--spacing-2xl);
  background: var(--surface);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-large);
  text-decoration: none;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  
  /* 🎬 ANIMACIÓN */
  animation: resource-reveal linear forwards;
  animation-timeline: view();
  animation-range: entry 0% cover 30%;
  opacity: 0;
  transform: translateY(30px) scale(0.95);
}

@keyframes resource-reveal {
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.resource-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.resource-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
}

.resource-card:hover::before {
  transform: scaleX(1);
}

.resource-icon {
  font-size: 3rem;
  transition: transform var(--transition-normal);
}

.resource-card:hover .resource-icon {
  transform: scale(1.2) rotate(5deg);
}

.resource-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.resource-description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin: 0;
}

/* ==========================================================================
   RESPONSIVE - PARTE 6
   ========================================================================== */

@media (max-width: 1024px) {
  .code-examples-grid {
    grid-template-columns: 1fr;
  }
  
  .comparison-grid {
    grid-template-columns: 1fr;
  }
  
  .property-row {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .property-example {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

@media (max-width: 768px) {
  .horizontal-content {
    padding: 0 var(--spacing-md);
  }
  
  .gallery-item {
    width: 260px;
    min-height: 220px;
    padding: var(--spacing-xl);
  }
  
  .diagram-phases {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  
  .use-cases-grid,
  .tips-grid,
  .resources-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .gallery-item {
    width: 240px;
    min-height: 200px;
    padding: var(--spacing-lg);
  }
  
  .item-number {
    font-size: var(--font-size-2xl);
  }
  
  .diagram-phases {
    grid-template-columns: 1fr;
  }
  
  .comparison-header h3 {
    font-size: var(--font-size-lg);
  }
  
  .code-example-content {
    padding: var(--spacing-md);
  }
}

/* ==========================================================================
   ACCESSIBILITY - REDUCED MOTION
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  .gallery-item,
  .code-example-card,
  .comparison-column,
  .comparison-metrics,
  .use-case-card,
  .range-diagram,
  .property-row,
  .browser-item,
  .tip-card,
  .resource-card {
    opacity: 1;
    transform: none;
    animation: none;
  }
  
  .gallery-item:hover,
  .code-example-card:hover,
  .use-case-card:hover,
  .tip-card:hover,
  .resource-card:hover {
    transform: none;
  }
}

/* ==========================================================================
   DARK MODE ADJUSTMENTS - PARTE 6
   ========================================================================== */

:root[data-theme="dark"] .horizontal-container {
  scrollbar-color: var(--primary-color) var(--surface);
}

:root[data-theme="dark"] .gallery-item,
:root[data-theme="dark"] .code-example-card,
:root[data-theme="dark"] .use-case-card,
:root[data-theme="dark"] .tip-card,
:root[data-theme="dark"] .resource-card {
  background: color-mix(in srgb, var(--surface) 80%, transparent);
}

:root[data-theme="dark"] .gallery-item:hover,
:root[data-theme="dark"] .code-example-card:hover,
:root[data-theme="dark"] .use-case-card:hover,
:root[data-theme="dark"] .tip-card:hover,
:root[data-theme="dark"] .resource-card:hover {
  background: var(--surface);
}

:root[data-theme="dark"] .comparison-column {
  background: color-mix(in srgb, var(--surface) 90%, transparent);
}

:root[data-theme="dark"] .range-diagram,
:root[data-theme="dark"] .range-examples,
:root[data-theme="dark"] .properties-table {
  background: color-mix(in srgb, var(--surface) 80%, transparent);
}

/* ==========================================================================
   PERFORMANCE OPTIMIZATIONS - PARTE 6
   ========================================================================== */

.gallery-item,
.code-example-card,
.comparison-column,
.use-case-card,
.tip-card,
.resource-card {
  contain: layout paint;
  will-change: transform, opacity;
}

.horizontal-container {
  contain: layout;
}

/* ==========================================================================
   FIN DE PARTE 6
   ========================================================================== */