/* ============================================
   TESIS V2 — "Light Airy" Aesthetic
   Clean whites, soft shadows, subtle colored
   accents, modern sans-serif, badge pills,
   gradient line accents, floating soft glows
   Inspired by GenIAI template
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Sora:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@300;400;500;600;700&display=swap');

:root {
  /* === Light Theme Palette === */
  --bg-void: #ffffff;
  --bg-deep: #f8f9fb;
  --bg-surface: #f0f2f5;
  --bg-elevated: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 1);
  --bg-card-border: rgba(0, 0, 0, 0.07);
  --bg-card-border-hover: rgba(0, 0, 0, 0.14);

  /* Accent: Electric blue-purple with warm orange hint */
  --accent-blue: #4f6ef7;
  --accent-purple: #7c5cfc;
  --accent-violet: #7c3aed;
  --accent-orange: #f97316;
  --accent-warm: #fb923c;
  --accent-gradient: linear-gradient(135deg, #4f6ef7 0%, #7c5cfc 50%, #a855f7 100%);
  --accent-gradient-text: linear-gradient(90deg, #4f6ef7, #7c3aed, #f97316);
  --accent-glow-blue: rgba(79, 110, 247, 0.06);
  --accent-glow-purple: rgba(124, 92, 252, 0.06);
  --accent-glow-orange: rgba(249, 115, 22, 0.04);

  /* Text */
  --text-primary: #1a1a2e;
  --text-secondary: #555770;
  --text-muted: #8b8fa8;
  --text-accent: #7c3aed;

  /* Borders */
  --border-dim: rgba(0, 0, 0, 0.05);
  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-medium: rgba(0, 0, 0, 0.12);
  --border-accent: rgba(124, 92, 252, 0.2);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.1);
  --glow-blue: 0 0 80px rgba(79, 110, 247, 0.06);
  --glow-purple: 0 0 60px rgba(124, 92, 252, 0.06);
  --glow-orange: 0 0 50px rgba(249, 115, 22, 0.04);

  /* Typography */
  --font-heading: 'Sora', sans-serif;
  --font-body: 'Space Grotesk', sans-serif;

  /* Spacing */
  --s-xs: 0.25rem; --s-sm: 0.5rem; --s-md: 1rem;
  --s-lg: 1.5rem; --s-xl: 2rem; --s-2xl: 3rem;
  --s-3xl: 4rem; --s-4xl: 6rem; --s-5xl: 8rem;

  /* Radius */
  --r-sm: 8px; --r-md: 12px; --r-lg: 16px;
  --r-xl: 20px; --r-2xl: 24px; --r-pill: 100px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --t-fast: 0.2s var(--ease-out);
  --t-base: 0.4s var(--ease-out);
  --t-slow: 0.7s var(--ease-out);

  --max-w: 1100px;
  --sidebar-w: 260px;
}

/* === Reset === */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:17px;scrollbar-width:thin;scrollbar-color:var(--accent-purple) var(--bg-deep)}
body{font-family:var(--font-body);background:var(--bg-void);color:var(--text-primary);line-height:1.75;overflow-x:hidden;-webkit-font-smoothing:antialiased}
::-webkit-scrollbar{width:4px}
::-webkit-scrollbar-track{background:var(--bg-deep)}
::-webkit-scrollbar-thumb{background:var(--accent-purple);border-radius:var(--r-pill)}
::selection{background:var(--accent-purple);color:#fff}
a{color:var(--text-accent);text-decoration:none;transition:color var(--t-fast)}
a:hover{color:var(--accent-blue)}
img{max-width:100%;display:block}

/* ============================================
   BACKGROUND: Soft light with colored glows
   ============================================ */
.space-bg{
  position:fixed;inset:0;z-index:-2;
  background:
    radial-gradient(ellipse 60% 50% at 15% 20%, rgba(79, 110, 247, 0.04), transparent),
    radial-gradient(ellipse 50% 60% at 85% 80%, rgba(124, 92, 252, 0.03), transparent),
    radial-gradient(ellipse 40% 40% at 50% 50%, rgba(249, 115, 22, 0.02), transparent),
    var(--bg-void);
}

/* Subtle grid overlay */
.grid-overlay{
  position:fixed;inset:0;z-index:-1;
  background-image:
    linear-gradient(rgba(0,0,0,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.02) 1px, transparent 1px);
  background-size:80px 80px;
  mask-image:radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
  -webkit-mask-image:radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
  pointer-events:none;
}

/* Floating glow orbs */
.glow-orb{
  position:fixed;border-radius:50%;pointer-events:none;z-index:-1;
  filter:blur(120px);will-change:transform;
}
.glow-orb--blue{
  width:500px;height:500px;
  background:rgba(79,110,247,0.06);
  top:-10%;left:10%;
  animation:drift-a 28s ease-in-out infinite;
}
.glow-orb--purple{
  width:400px;height:400px;
  background:rgba(124,92,252,0.05);
  bottom:5%;right:5%;
  animation:drift-b 35s ease-in-out infinite;
}
.glow-orb--orange{
  width:300px;height:300px;
  background:rgba(249,115,22,0.04);
  top:45%;left:55%;
  animation:drift-c 22s ease-in-out infinite;
}
@keyframes drift-a{
  0%,100%{transform:translate(0,0) scale(1)}
  33%{transform:translate(60px,40px) scale(1.15)}
  66%{transform:translate(-30px,-50px) scale(0.9)}
}
@keyframes drift-b{
  0%,100%{transform:translate(0,0) scale(1)}
  50%{transform:translate(-50px,-60px) scale(1.2)}
}
@keyframes drift-c{
  0%,100%{transform:translate(0,0) scale(1)}
  25%{transform:translate(-40px,30px) scale(1.1)}
  75%{transform:translate(30px,-20px) scale(0.85)}
}

/* ============================================
   LOADER
   ============================================ */
.loader{
  position:fixed;inset:0;z-index:10000;
  background:var(--bg-void);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  transition:opacity 0.8s ease,visibility 0.8s ease;
}
.loader.hidden{opacity:0;visibility:hidden;pointer-events:none}
.loader-dot-group{display:flex;gap:8px}
.loader-dot{
  width:8px;height:8px;border-radius:50%;background:var(--accent-purple);
  animation:dot-bounce 1.2s ease-in-out infinite;
}
.loader-dot:nth-child(2){animation-delay:0.15s}
.loader-dot:nth-child(3){animation-delay:0.3s}
@keyframes dot-bounce{
  0%,80%,100%{transform:scale(0.6);opacity:0.4}
  40%{transform:scale(1);opacity:1}
}
.loader-label{
  margin-top:var(--s-lg);font-family:var(--font-heading);
  font-size:0.85rem;color:var(--text-muted);
  letter-spacing:0.2em;text-transform:uppercase;
}

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar{
  position:fixed;left:0;top:0;bottom:0;width:var(--sidebar-w);
  background:rgba(255,255,255,0.97);
  backdrop-filter:blur(30px);-webkit-backdrop-filter:blur(30px);
  border-right:1px solid var(--border-dim);
  z-index:1000;display:flex;flex-direction:column;
  padding:var(--s-xl) var(--s-lg);
  transition:transform var(--t-base);overflow-y:auto;
}

.sidebar-brand{
  display:flex;align-items:center;gap:var(--s-md);
  padding-bottom:var(--s-xl);
  border-bottom:1px solid var(--border-dim);
  margin-bottom:var(--s-lg);
}

.sidebar-logo{
  width:36px;height:36px;border-radius:var(--r-md);
  background:var(--accent-gradient);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-heading);font-weight:800;font-size:1rem;color:#fff;
  flex-shrink:0;
  box-shadow:0 0 20px rgba(124,92,252,0.3);
}

.sidebar-title{
  font-family:var(--font-heading);font-size:0.95rem;font-weight:700;
  color:var(--text-primary);line-height:1.3;
}
.sidebar-subtitle{
  font-size:0.7rem;font-weight:500;color:var(--text-muted);
  margin-top:2px;text-transform:uppercase;letter-spacing:0.15em;
}

.nav-section-label{
  font-size:0.65rem;font-weight:700;text-transform:uppercase;
  letter-spacing:0.2em;color:var(--text-muted);
  margin-bottom:var(--s-sm);margin-top:var(--s-md);
}

.nav-links{list-style:none;display:flex;flex-direction:column;gap:2px;flex:1}

.nav-link{
  display:flex;align-items:center;gap:var(--s-md);
  padding:10px 12px;border-radius:var(--r-md);
  color:var(--text-secondary);font-size:0.9rem;font-weight:500;
  cursor:pointer;transition:all var(--t-fast);
  position:relative;text-decoration:none;
  border:1px solid transparent;
}
.nav-link:hover{
  background:rgba(0,0,0,0.03);color:var(--text-primary);
  border-color:var(--border-subtle);
}
.nav-link.active{
  background:var(--accent-glow-purple);
  color:var(--accent-violet);font-weight:600;
  border-color:var(--border-accent);
}

.nav-icon{font-size:1.05rem;width:22px;text-align:center;flex-shrink:0}

.nav-number{
  display:inline-flex;align-items:center;justify-content:center;
  width:22px;height:22px;border-radius:6px;
  background:rgba(0,0,0,0.04);
  font-size:0.7rem;font-weight:700;flex-shrink:0;
  letter-spacing:0.05em;transition:all var(--t-fast);
  border:1px solid var(--border-dim);
}
.nav-link.active .nav-number{
  background:var(--accent-gradient);color:#fff;
  border-color:transparent;
  box-shadow:0 0 12px rgba(124,92,252,0.4);
}

.sidebar-progress{
  margin-top:auto;padding-top:var(--s-lg);
  border-top:1px solid var(--border-dim);
}
.progress-label{
  font-size:0.75rem;color:var(--text-muted);
  margin-bottom:var(--s-sm);display:flex;justify-content:space-between;
}
.progress-track{height:3px;background:var(--border-dim);border-radius:var(--r-pill);overflow:hidden}
.progress-fill{height:100%;background:var(--accent-gradient);border-radius:var(--r-pill);width:0%;transition:width var(--t-slow)}

/* Recursos Legales sidebar block */
.sidebar-resources{
  padding-top:var(--s-lg);
  border-top:1px solid var(--border-dim);
  margin-top:var(--s-md);
  display:flex;flex-direction:column;gap:4px;
}
.resource-link{
  display:flex;align-items:center;gap:10px;
  padding:9px 12px;border-radius:var(--r-md);
  text-decoration:none;
  color:var(--text-secondary);
  border:1px solid var(--border-dim);
  background:rgba(79,110,247,0.03);
  transition:all var(--t-fast);
  position:relative;
}
.resource-link:hover{
  background:rgba(79,110,247,0.07);
  border-color:var(--border-accent);
  color:var(--accent-violet);
  transform:translateX(2px);
}
.resource-icon{font-size:1rem;flex-shrink:0;line-height:1}
.resource-text{display:flex;flex-direction:column;flex:1;min-width:0}
.resource-name{font-size:0.85rem;font-weight:700;color:var(--text-primary);line-height:1.2;font-family:var(--font-heading)}
.resource-link:hover .resource-name{color:var(--accent-violet)}
.resource-desc{font-size:0.68rem;color:var(--text-muted);margin-top:1px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.resource-arrow{
  font-size:0.7rem;color:var(--text-muted);flex-shrink:0;
  transition:transform var(--t-fast),color var(--t-fast);
}
.resource-link:hover .resource-arrow{
  transform:translate(2px,-2px);
  color:var(--accent-violet);
}

/* Mobile */
.mobile-toggle{
  display:none;position:fixed;top:var(--s-md);left:var(--s-md);z-index:1100;
  width:44px;height:44px;border-radius:var(--r-md);
  background:rgba(255,255,255,0.95);backdrop-filter:blur(20px);
  border:1px solid var(--border-subtle);color:var(--text-primary);
  font-size:1.1rem;cursor:pointer;align-items:center;justify-content:center;
  transition:all var(--t-fast);
  box-shadow:var(--shadow-sm);
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content{margin-left:var(--sidebar-w);min-height:100vh}

.section{display:none;animation:reveal 0.6s var(--ease-out)}
.section.active{display:block}
@keyframes reveal{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}

/* ============================================
   HERO
   ============================================ */
.hero{
  position:relative;min-height:100vh;
  display:flex;align-items:center;justify-content:center;
  text-align:center;
  padding:var(--s-4xl) var(--s-2xl);overflow:hidden;
}

/* Hero background image */
.hero-bg-image{
  position:absolute;inset:0;
  background-size:cover;background-position:center;
  opacity:0.35;
  filter:blur(2px);
  z-index:0;
}

/* Radial glow behind hero text */
.hero::before{
  content:'';position:absolute;
  width:600px;height:400px;
  top:50%;left:50%;transform:translate(-50%,-55%);
  background:radial-gradient(ellipse, rgba(124,92,252,0.06) 0%, transparent 70%);
  pointer-events:none;z-index:0;
}

.hero-inner{position:relative;z-index:1;max-width:720px}

/* pill badge */
.hero-badge{
  display:inline-flex;align-items:center;gap:var(--s-sm);
  padding:6px 20px;border-radius:var(--r-pill);
  background:transparent;
  border:1px solid var(--border-medium);
  font-family:var(--font-heading);font-size:0.8rem;font-weight:600;
  color:var(--text-secondary);
  letter-spacing:0.15em;text-transform:uppercase;
  margin-bottom:var(--s-2xl);
  animation:fadeUp 0.7s var(--ease-out) 0.1s both;
}
.hero-badge .dot{
  width:6px;height:6px;border-radius:50%;
  background:var(--accent-purple);
  box-shadow:0 0 8px var(--accent-purple);
}

.hero h1{
  font-family:var(--font-heading);
  font-size:clamp(2.4rem,5.5vw,3.8rem);
  font-weight:800;line-height:1.12;
  margin-bottom:var(--s-xl);
  letter-spacing:-0.02em;
  animation:fadeUp 0.7s var(--ease-out) 0.25s both;
}

.gradient-text{
  background:var(--accent-gradient-text);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
  background-size:200% auto;
  animation:shimmer 4s ease-in-out infinite;
}

@keyframes shimmer{
  0%{background-position:0% 50%}
  50%{background-position:100% 50%}
  100%{background-position:0% 50%}
}

/* Typewriter cursor */
.typewriter{
  position:relative;
}
.typewriter::after{
  content:'|';
  position:relative;
  -webkit-text-fill-color:var(--accent-purple);
  animation:blink-cursor 1s step-end infinite;
  font-weight:300;
  margin-left:2px;
}
@keyframes blink-cursor{
  0%,100%{opacity:1}
  50%{opacity:0}
}

.hero-desc{
  font-size:1.2rem;color:var(--text-secondary);
  line-height:1.85;max-width:560px;margin:0 auto var(--s-2xl);
  animation:fadeUp 0.7s var(--ease-out) 0.4s both;
}

.hero-subtitle-thesis{
  font-family:var(--font-heading);
  font-size:1.1rem;font-weight:600;
  color:var(--accent-violet);
  letter-spacing:0.02em;
  margin-bottom:var(--s-lg);
  animation:fadeUp 0.7s var(--ease-out) 0.33s both;
  line-height:1.6;
}

.hero-actions{
  display:flex;gap:var(--s-md);justify-content:center;flex-wrap:wrap;
  animation:fadeUp 0.7s var(--ease-out) 0.55s both;
}

@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}

/* Decorative gradient line under hero */
.hero-line{
  position:absolute;bottom:0;left:10%;right:10%;height:1px;
  background:linear-gradient(90deg, transparent, var(--accent-purple), var(--accent-orange), transparent);
  opacity:0.3;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn{
  display:inline-flex;align-items:center;gap:var(--s-sm);
  padding:12px 28px;border-radius:var(--r-pill);
  font-family:var(--font-heading);font-size:0.95rem;font-weight:600;
  cursor:pointer;border:none;transition:all var(--t-base);
  text-decoration:none;letter-spacing:0.01em;
}
.btn-primary{
  background:var(--accent-gradient);color:#fff;
  box-shadow:0 4px 20px rgba(124,92,252,0.25);
}
.btn-primary:hover{
  transform:translateY(-2px);
  box-shadow:0 8px 32px rgba(124,92,252,0.4);color:#fff;
}
.btn-outline{
  background:transparent;color:var(--text-primary);
  border:1px solid var(--border-medium);
}
.btn-outline:hover{
  border-color:var(--accent-purple);
  background:var(--accent-glow-purple);
  transform:translateY(-2px);color:var(--text-primary);
}

/* ============================================
   SECTION CONTENT
   ============================================ */
.section-wrap{padding:var(--s-3xl) var(--s-2xl);max-width:var(--max-w);margin:0 auto}

.section-header{margin-bottom:var(--s-3xl)}

.section-tag{
  display:inline-flex;align-items:center;gap:var(--s-sm);
  padding:5px 16px;border-radius:var(--r-pill);
  border:1px solid var(--border-subtle);
  font-family:var(--font-heading);font-size:0.78rem;font-weight:600;
  color:var(--text-muted);text-transform:uppercase;letter-spacing:0.18em;
  margin-bottom:var(--s-xl);
}
.section-tag .tag-dot{
  width:5px;height:5px;border-radius:50%;background:var(--accent-purple);
}

.section-title{
  font-family:var(--font-heading);
  font-size:clamp(1.8rem,4vw,2.6rem);
  font-weight:800;line-height:1.12;margin-bottom:var(--s-md);
  letter-spacing:-0.02em;
}

.section-subtitle{
  font-size:1.1rem;color:var(--text-secondary);
  max-width:680px;line-height:1.85;
}

/* ============================================
   SECTION IMAGES
   ============================================ */
.section-image{
  margin:var(--s-2xl) 0;
  border-radius:var(--r-xl);
  overflow:hidden;
  border:1px solid var(--bg-card-border);
  background:var(--bg-surface);
  box-shadow:var(--shadow-md);
  transition:all var(--t-base);
}
.section-image:hover{
  border-color:var(--bg-card-border-hover);
  box-shadow:var(--glow-purple), var(--shadow-lg);
  transform:translateY(-4px);
}
.section-image img{
  width:100%;
  display:block;
}
.section-image-caption{
  padding:var(--s-md) var(--s-lg);
  font-size:0.88rem;
  color:var(--text-muted);
  font-weight:500;
  border-top:1px solid var(--border-dim);
  background:rgba(0,0,0,0.02);
}
.section-image--compact{
  max-width:700px;
  margin-left:auto;
  margin-right:auto;
}

/* ============================================
   CARDS
   ============================================ */
.cards-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:var(--s-lg);margin:var(--s-2xl) 0;
}

.card{
  background:var(--bg-card);
  border:1px solid var(--bg-card-border);
  border-radius:var(--r-xl);
  padding:var(--s-xl) var(--s-lg);
  transition:all var(--t-base);
  position:relative;overflow:hidden;
  box-shadow:var(--shadow-sm);
}

/* Gradient line at top on hover */
.card::after{
  content:'';position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--accent-purple),var(--accent-orange),transparent);
  opacity:0;transition:opacity var(--t-base);
}
.card:hover{
  background:var(--bg-card-hover);
  border-color:var(--bg-card-border-hover);
  transform:translateY(-4px);
  box-shadow:var(--glow-purple), var(--shadow-md);
}
.card:hover::after{opacity:1}

.card-icon{
  width:42px;height:42px;border-radius:var(--r-md);
  background:rgba(124,92,252,0.08);
  border:1px solid rgba(124,92,252,0.15);
  display:flex;align-items:center;justify-content:center;
  font-size:1.2rem;margin-bottom:var(--s-lg);
}

.card-title{
  font-family:var(--font-heading);font-size:1.15rem;font-weight:700;
  margin-bottom:var(--s-xs);letter-spacing:-0.01em;
}
.card-text{font-size:1rem;color:var(--text-secondary);line-height:1.75}

/* ============================================
   VIDEO THEATER
   ============================================ */
.video-theater{
  margin:var(--s-2xl) 0;border-radius:var(--r-xl);overflow:hidden;
  background:var(--bg-surface);border:1px solid var(--border-dim);
  box-shadow:var(--shadow-md);
}
.video-header{
  padding:10px var(--s-lg);display:flex;align-items:center;gap:var(--s-sm);
  font-size:0.85rem;font-weight:600;color:var(--text-muted);
  border-bottom:1px solid var(--border-dim);
  background:rgba(0,0,0,0.02);
}
.video-header .play-dot{
  width:8px;height:8px;border-radius:50%;background:var(--accent-purple);
  box-shadow:0 0 6px var(--accent-purple);
}
.video-box{position:relative;padding-bottom:56.25%;height:0}
.video-box iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:none}

.video-fallback{
  position:relative;
  text-align:center;
  padding:var(--s-sm) var(--s-md);
  background:rgba(0,0,0,0.03);
  font-size:0.88rem;
}
.video-fallback a{
  color:var(--accent-violet);
  text-decoration:none;
  font-weight:500;
  transition:color var(--t-fast);
}
.video-fallback a:hover{
  color:var(--text-primary);
  text-decoration:underline;
}

/* ============================================
   TEXT & HIGHLIGHT
   ============================================ */
.text-block{
  font-size:1.08rem;line-height:1.9;color:var(--text-secondary);margin:var(--s-xl) 0;
}
.text-block p{margin-bottom:var(--s-lg)}
.text-block strong{color:var(--text-primary);font-weight:600}

.callout{
  background:linear-gradient(135deg, rgba(79,110,247,0.05), rgba(124,92,252,0.03));
  border:1px solid var(--border-accent);
  border-radius:var(--r-lg);
  padding:var(--s-xl);margin:var(--s-2xl) 0;
  font-size:1.08rem;line-height:1.85;color:var(--text-accent);
  position:relative;overflow:hidden;
}
.callout::before{
  content:'';position:absolute;top:0;left:0;bottom:0;width:2px;
  background:var(--accent-gradient);
}

/* ============================================
   INTERACTIVE TIMELINE / ACCORDION
   ============================================ */
.timeline{
  display:flex;flex-direction:column;
  gap:0;margin:var(--s-2xl) 0;
  position:relative;
}

.timeline-item{
  display:flex;
  gap:var(--s-lg);
  position:relative;
}

.timeline-marker{
  display:flex;flex-direction:column;align-items:center;
  flex-shrink:0;width:48px;
}

.timeline-dot{
  width:42px;height:42px;border-radius:50%;
  background:var(--bg-surface);
  border:2px solid var(--border-accent);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-heading);font-size:0.8rem;font-weight:800;
  color:var(--accent-violet);
  transition:all var(--t-base);
  z-index:2;
  flex-shrink:0;
}

.timeline-item:hover .timeline-dot,
.timeline-item.open .timeline-dot{
  background:var(--accent-gradient);
  border-color:transparent;
  color:#fff;
  box-shadow:0 0 20px rgba(124,92,252,0.4);
}

.timeline-line{
  flex:1;width:2px;
  background:linear-gradient(to bottom, var(--border-accent), transparent);
  min-height:20px;
}

.timeline-content{
  flex:1;
  padding-bottom:var(--s-xl);
}

.timeline-header{
  display:flex;align-items:center;justify-content:space-between;
  cursor:pointer;
  padding:var(--s-md) var(--s-lg);
  background:var(--bg-card);
  border:1px solid var(--bg-card-border);
  border-radius:var(--r-lg);
  transition:all var(--t-base);
  box-shadow:var(--shadow-sm);
}

.timeline-header:hover{
  background:var(--bg-card-hover);
  border-color:var(--bg-card-border-hover);
}

.timeline-item.open .timeline-header{
  border-color:var(--border-accent);
  background:var(--accent-glow-purple);
  border-radius:var(--r-lg) var(--r-lg) 0 0;
}

.timeline-header h4{
  font-family:var(--font-heading);font-size:1.15rem;font-weight:700;
  letter-spacing:-0.01em;
}

.accordion-icon{
  font-size:1.2rem;font-weight:300;color:var(--text-muted);
  transition:transform var(--t-base);
  width:28px;height:28px;
  display:flex;align-items:center;justify-content:center;
  border-radius:50%;
  background:rgba(0,0,0,0.04);
  border:1px solid var(--border-dim);
  flex-shrink:0;
}

.timeline-item.open .accordion-icon{
  transform:rotate(45deg);
  background:var(--accent-gradient);
  color:#fff;
  border-color:transparent;
}

.accordion-body{
  max-height:0;overflow:hidden;
  transition:max-height 0.5s var(--ease-out), padding 0.3s ease;
  background:var(--bg-card);
  border:1px solid var(--bg-card-border);
  border-top:none;
  border-radius:0 0 var(--r-lg) var(--r-lg);
  padding:0 var(--s-lg);
}

.timeline-item.open .accordion-body{
  max-height:none;
  padding:var(--s-lg);
  border-color:var(--border-accent);
}

.accordion-body p{
  font-size:1.02rem;color:var(--text-secondary);line-height:1.85;
  margin-bottom:var(--s-md);
}

.accordion-body p:last-child{margin-bottom:0}

.accordion-image{
  border-radius:var(--r-md);overflow:hidden;
  margin-bottom:var(--s-md);
  border:1px solid var(--border-dim);
}
.accordion-image img{
  width:100%;display:block;
}

/* ============================================
   FLIP CARDS
   ============================================ */
.flip-grid{
  perspective:1000px;
}

.flip-card{
  cursor:pointer;
  height:280px;
  perspective:1000px;
  background:transparent !important;
  border:none !important;
  padding:0 !important;
  overflow:visible !important;
}
.flip-card::after{display:none !important}

.flip-card-inner{
  position:relative;
  width:100%;height:100%;
  transition:transform 0.7s var(--ease-out);
  transform-style:preserve-3d;
}

.flip-card.flipped .flip-card-inner{
  transform:rotateY(180deg);
}

.flip-card-front,
.flip-card-back{
  position:absolute;inset:0;
  backface-visibility:hidden;
  -webkit-backface-visibility:hidden;
  background:var(--bg-card);
  border:1px solid var(--bg-card-border);
  border-radius:var(--r-xl);
  padding:var(--s-xl) var(--s-lg);
  display:flex;flex-direction:column;
  transition:border-color var(--t-base);
  box-shadow:var(--shadow-sm);
}

.flip-card:hover .flip-card-front,
.flip-card:hover .flip-card-back{
  border-color:var(--border-accent);
}

.flip-card-front{
  justify-content:center;
  align-items:flex-start;
}

.flip-card-back{
  transform:rotateY(180deg);
  justify-content:center;
  background:linear-gradient(135deg, rgba(79,110,247,0.04), rgba(124,92,252,0.03));
  border-color:var(--border-accent);
}

.flip-card-back .card-title{
  margin-bottom:var(--s-sm);
  color:var(--accent-violet);
}

.flip-card-back .card-text{
  font-size:0.95rem;
  margin-bottom:var(--s-sm);
}

.flip-list{
  list-style:none;
  padding:0;margin:0;
}
.flip-list li{
  font-size:0.9rem;
  color:var(--text-secondary);
  padding:3px 0;
  padding-left:16px;
  position:relative;
}
.flip-list li::before{
  content:'→';
  position:absolute;left:0;
  color:var(--accent-purple);
  font-size:0.82rem;
}

.flip-hint{
  margin-top:auto;
  font-size:0.78rem;
  color:var(--text-muted);
  font-weight:500;
  letter-spacing:0.1em;
}

/* ============================================
   HOVER REVEAL CARDS
   ============================================ */
.reveal-card{
  background:var(--bg-card);
  border:1px solid var(--bg-card-border);
  border-radius:var(--r-xl);
  padding:var(--s-xl) var(--s-lg);
  transition:all var(--t-base);
  position:relative;overflow:hidden;
  min-height:180px;
  box-shadow:var(--shadow-sm);
}

.reveal-card::after{
  content:'';position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--accent-purple),var(--accent-orange),transparent);
  opacity:0;transition:opacity var(--t-base);
}

.reveal-card:hover{
  background:var(--bg-card-hover);
  border-color:var(--border-accent);
  transform:translateY(-4px);
  box-shadow:var(--glow-purple), var(--shadow-md);
}
.reveal-card:hover::after{opacity:1}

.reveal-card-front{
  transition:all var(--t-base);
}

.reveal-card-detail{
  max-height:0;overflow:hidden;
  transition:max-height 0.5s var(--ease-out), margin 0.3s ease, opacity 0.3s ease;
  opacity:0;
}

.reveal-card:hover .reveal-card-detail{
  max-height:200px;
  margin-top:var(--s-md);
  opacity:1;
}

.reveal-card-detail p{
  font-size:1rem;color:var(--text-secondary);line-height:1.75;
  padding-top:var(--s-sm);
  border-top:1px solid var(--border-dim);
}

.reveal-hint{
  display:inline-block;
  margin-top:var(--s-sm);
  font-size:0.78rem;
  color:var(--text-muted);
  font-weight:500;
  transition:color var(--t-fast);
}

.reveal-card:hover .reveal-hint{
  color:var(--accent-violet);
}

/* ============================================
   INTERACTIVE TABS
   ============================================ */
.content-tabs{
  margin:var(--s-2xl) 0;
  background:var(--bg-card);
  border:1px solid var(--bg-card-border);
  border-radius:var(--r-xl);
  overflow:hidden;
  box-shadow:var(--shadow-sm);
}

.tab-nav{
  display:flex;
  border-bottom:1px solid var(--border-dim);
  background:rgba(0,0,0,0.02);
  overflow-x:auto;
}

.tab-btn{
  flex:1;
  padding:var(--s-md) var(--s-lg);
  background:transparent;
  border:none;
  color:var(--text-muted);
  font-family:var(--font-heading);
  font-size:0.95rem;
  font-weight:600;
  cursor:pointer;
  transition:all var(--t-base);
  position:relative;
  white-space:nowrap;
}

.tab-btn:hover{
  color:var(--text-primary);
  background:rgba(0,0,0,0.03);
}

.tab-btn.active{
  color:var(--accent-violet);
  background:var(--accent-glow-purple);
}

.tab-btn.active::after{
  content:'';
  position:absolute;bottom:0;left:20%;right:20%;height:2px;
  background:var(--accent-gradient);
  border-radius:var(--r-pill);
}

.tab-panels{
  padding:var(--s-xl);
}

.tab-panel{
  display:none;
  animation:reveal 0.4s var(--ease-out);
}

.tab-panel.active{
  display:block;
}

.tab-panel h4{
  font-family:var(--font-heading);
  font-size:1.25rem;font-weight:700;
  margin-bottom:var(--s-md);
  color:var(--text-primary);
}

.tab-panel p{
  font-size:1.05rem;color:var(--text-secondary);
  line-height:1.85;margin-bottom:var(--s-md);
}
.tab-panel p:last-child{margin-bottom:0}

/* ============================================
   STATS
   ============================================ */
.stats-row{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));
  gap:var(--s-md);margin:var(--s-3xl) 0;
}
.stat{
  text-align:center;padding:var(--s-xl) var(--s-md);
  background:var(--bg-card);border:1px solid var(--bg-card-border);
  border-radius:var(--r-lg);transition:all var(--t-base);
  box-shadow:var(--shadow-sm);
}
.stat:hover{border-color:var(--border-accent);box-shadow:var(--glow-purple), var(--shadow-md)}
.stat-num{
  font-family:var(--font-heading);font-size:2.2rem;font-weight:800;
  background:var(--accent-gradient);-webkit-background-clip:text;
  -webkit-text-fill-color:transparent;background-clip:text;
}
.stat-label{font-size:0.85rem;color:var(--text-muted);margin-top:var(--s-xs);font-weight:500}

/* ============================================
   QUIZ
   ============================================ */
.quiz-container{max-width:780px;margin:0 auto}

.quiz-progress{margin-bottom:var(--s-2xl)}
.quiz-progress-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--s-sm)}
.quiz-progress-text{font-size:0.88rem;color:var(--text-muted)}
.quiz-progress-count{font-family:var(--font-heading);font-weight:700;color:var(--accent-violet)}
.quiz-progress-bar{height:3px;background:var(--border-dim);border-radius:var(--r-pill);overflow:hidden}
.quiz-progress-fill{height:100%;background:var(--accent-gradient);border-radius:var(--r-pill);transition:width var(--t-base)}

.quiz-question{
  background:var(--bg-card);border:1px solid var(--bg-card-border);
  border-radius:var(--r-2xl);padding:var(--s-2xl);
  margin-bottom:var(--s-xl);animation:reveal 0.4s var(--ease-out);
  box-shadow:var(--shadow-sm);
}
.quiz-question-number{
  font-family:var(--font-heading);font-size:0.78rem;font-weight:700;
  color:var(--accent-violet);text-transform:uppercase;
  letter-spacing:0.18em;margin-bottom:var(--s-md);
}
.quiz-question-text{
  font-family:var(--font-heading);font-size:1.25rem;font-weight:600;
  line-height:1.5;margin-bottom:var(--s-xl);letter-spacing:-0.01em;
}

.quiz-options{display:flex;flex-direction:column;gap:var(--s-sm)}

.quiz-option{
  display:flex;align-items:center;gap:var(--s-md);
  padding:13px var(--s-lg);
  background:rgba(0,0,0,0.02);
  border:1px solid var(--border-dim);
  border-radius:var(--r-md);cursor:pointer;
  transition:all 0.2s ease;font-size:1.02rem;line-height:1.65;
}
.quiz-option:hover:not(.disabled){border-color:var(--border-accent);background:var(--accent-glow-purple)}
.quiz-option.selected{border-color:var(--accent-purple);background:var(--accent-glow-purple)}
.quiz-option.correct{border-color:#16a34a;background:rgba(22,163,74,0.06)}
.quiz-option.incorrect{border-color:#dc2626;background:rgba(220,38,38,0.06)}
.quiz-option.disabled{cursor:default;opacity:0.55}
.quiz-option.correct.disabled,.quiz-option.incorrect.disabled{opacity:1}

.quiz-option-letter{
  width:28px;height:28px;border-radius:6px;
  background:rgba(0,0,0,0.04);border:1px solid var(--border-dim);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-heading);font-weight:700;font-size:0.88rem;
  flex-shrink:0;transition:all 0.2s ease;
}
.quiz-option.correct .quiz-option-letter{background:#16a34a;color:#fff;border-color:#16a34a}
.quiz-option.incorrect .quiz-option-letter{background:#dc2626;color:#fff;border-color:#dc2626}

.quiz-feedback{
  margin-top:var(--s-lg);padding:10px var(--s-lg);border-radius:var(--r-md);
  font-size:0.98rem;font-weight:500;display:none;animation:reveal 0.3s ease;
}
.quiz-feedback.show{display:flex;align-items:center;gap:var(--s-sm)}
.quiz-feedback.correct{background:rgba(22,163,74,0.06);color:#16a34a;border:1px solid rgba(22,163,74,0.15)}
.quiz-feedback.incorrect{background:rgba(220,38,38,0.06);color:#dc2626;border:1px solid rgba(220,38,38,0.15)}

.quiz-nav{display:flex;justify-content:space-between;align-items:center;margin-top:var(--s-xl)}

/* Quiz Results */
.quiz-results{text-align:center;padding:var(--s-4xl) var(--s-2xl);animation:reveal 0.6s ease}
.quiz-results-score{position:relative;width:170px;height:170px;margin:0 auto var(--s-2xl)}
.quiz-results-circle{width:100%;height:100%;transform:rotate(-90deg)}
.quiz-results-circle .track{fill:none;stroke:var(--border-dim);stroke-width:5}
.quiz-results-circle .fill{fill:none;stroke:var(--accent-purple);stroke-width:5;stroke-linecap:round;stroke-dasharray:502;stroke-dashoffset:502;transition:stroke-dashoffset 1.5s var(--ease-out)}
.quiz-results-circle .fill.success{stroke:#16a34a}
.quiz-results-circle .fill.warning{stroke:#d97706}
.quiz-results-circle .fill.error{stroke:#dc2626}
.quiz-results-percentage{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-family:var(--font-heading);font-size:2.4rem;font-weight:800}
.quiz-results-label{font-family:var(--font-heading);font-size:1.7rem;font-weight:700;margin-bottom:var(--s-md)}
.quiz-results-detail{font-size:1.08rem;color:var(--text-secondary);margin-bottom:var(--s-2xl)}
.quiz-results-breakdown{display:flex;justify-content:center;gap:var(--s-3xl);margin-bottom:var(--s-2xl)}
.breakdown-item{text-align:center}
.breakdown-number{font-family:var(--font-heading);font-size:2rem;font-weight:800}
.breakdown-number.correct-color{color:#16a34a}
.breakdown-number.incorrect-color{color:#dc2626}
.breakdown-label{font-size:0.85rem;color:var(--text-muted)}

/* ============================================
   COMMENTS / LIBRO DE VISITAS
   ============================================ */
.comment-form-card{
  background:var(--bg-card);
  border:1px solid var(--bg-card-border);
  border-radius:var(--r-2xl);
  overflow:hidden;
  margin-bottom:var(--s-2xl);
  box-shadow:var(--shadow-sm);
}

.comment-form-header{
  padding:var(--s-md) var(--s-lg);
  display:flex;align-items:center;gap:var(--s-sm);
  font-family:var(--font-heading);
  font-size:0.92rem;font-weight:600;
  color:var(--text-primary);
  background:rgba(0,0,0,0.02);
  border-bottom:1px solid var(--border-dim);
}

.comment-form-icon{font-size:1.1rem}

.comment-form-body{
  padding:var(--s-xl);
}

.comment-form-row{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:var(--s-md);
  margin-bottom:var(--s-md);
}

.form-group{
  display:flex;flex-direction:column;gap:var(--s-xs);
  margin-bottom:var(--s-md);
}

.form-group label{
  font-size:0.82rem;font-weight:600;color:var(--text-muted);
  text-transform:uppercase;letter-spacing:0.12em;
}

.form-group input,
.form-group select,
.form-group textarea{
  background:rgba(0,0,0,0.02);
  border:1px solid var(--border-dim);
  border-radius:var(--r-md);
  padding:10px var(--s-md);
  color:var(--text-primary);
  font-family:var(--font-body);
  font-size:1rem;
  transition:all var(--t-fast);
  outline:none;
  resize:vertical;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus{
  border-color:var(--accent-purple);
  background:var(--accent-glow-purple);
  box-shadow:0 0 20px rgba(124,92,252,0.08);
}

.form-group input::placeholder,
.form-group textarea::placeholder{
  color:var(--text-muted);
}

.form-group select{
  cursor:pointer;
  appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%238b8fa8'%3E%3Cpath d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat:no-repeat;
  background-position:right 12px center;
  padding-right:32px;
}

.form-group select option{
  background:var(--bg-elevated);
  color:var(--text-primary);
}

.char-count{
  font-size:0.75rem;color:var(--text-muted);
  text-align:right;margin-top:4px;
}

.comment-form-actions{
  display:flex;justify-content:flex-end;
  padding-top:var(--s-sm);
}

/* Comments counter */
.comments-count{
  display:flex;align-items:center;gap:var(--s-sm);
  font-size:0.92rem;color:var(--text-muted);
  margin-bottom:var(--s-lg);
  padding-bottom:var(--s-md);
  border-bottom:1px solid var(--border-dim);
}
.comments-count-num{
  font-family:var(--font-heading);font-weight:800;
  font-size:1.2rem;
  color:var(--accent-violet);
}

/* Comments list */
.comments-list{
  display:flex;flex-direction:column;gap:var(--s-md);
}

.comment-item{
  background:var(--bg-card);
  border:1px solid var(--bg-card-border);
  border-radius:var(--r-lg);
  padding:var(--s-lg);
  transition:all var(--t-base);
  animation:comment-in 0.5s var(--ease-out);
  box-shadow:var(--shadow-sm);
}

@keyframes comment-in{
  from{opacity:0;transform:translateY(16px) scale(0.98)}
  to{opacity:1;transform:translateY(0) scale(1)}
}

.comment-item:hover{
  border-color:var(--bg-card-border-hover);
}

.comment-header{
  display:flex;align-items:center;gap:var(--s-md);
  margin-bottom:var(--s-md);
}

.comment-avatar{
  width:38px;height:38px;border-radius:50%;
  background:var(--accent-gradient);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-heading);font-weight:800;font-size:0.8rem;color:#fff;
  flex-shrink:0;
}

.comment-meta{flex:1}

.comment-name{
  font-family:var(--font-heading);
  font-size:1rem;font-weight:700;
  color:var(--text-primary);
}

.comment-role-tag{
  display:inline-block;
  margin-left:var(--s-sm);
  padding:2px 8px;
  border-radius:var(--r-pill);
  font-size:0.72rem;font-weight:600;
  background:var(--accent-glow-purple);
  color:var(--accent-violet);
  border:1px solid var(--border-accent);
  vertical-align:middle;
}

.comment-time{
  font-size:0.78rem;color:var(--text-muted);
  margin-top:2px;
}

.comment-body{
  font-size:1.02rem;color:var(--text-secondary);
  line-height:1.75;
  margin-bottom:var(--s-md);
}

.comment-actions{
  display:flex;align-items:center;gap:var(--s-lg);
}

.comment-action-btn{
  display:flex;align-items:center;gap:var(--s-xs);
  background:none;border:none;
  color:var(--text-muted);
  font-size:0.85rem;font-weight:500;
  cursor:pointer;
  transition:all var(--t-fast);
  padding:4px 8px;border-radius:var(--r-sm);
}

.comment-action-btn:hover{
  color:var(--accent-violet);
  background:var(--accent-glow-purple);
}

.comment-action-btn.liked{
  color:var(--accent-violet);
}

.comment-like-count{
  font-family:var(--font-heading);font-weight:700;
}

/* ============================================
   FOOTER
   ============================================ */
.footer{
  padding:var(--s-2xl);text-align:center;
  border-top:1px solid var(--border-dim);
  color:var(--text-muted);font-size:0.88rem;
}
.footer-heart{color:var(--accent-purple)}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */
.anim{opacity:0;transform:translateY(20px);transition:all 0.7s var(--ease-out)}
.anim.visible{opacity:1;transform:translateY(0)}
.anim.d1{transition-delay:0.1s}.anim.d2{transition-delay:0.2s}
.anim.d3{transition-delay:0.3s}.anim.d4{transition-delay:0.4s}

/* ============================================
   RESPONSIVE
   ============================================ */
@media(max-width:900px){
  .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:translateX(0);box-shadow:var(--shadow-lg)}
  .mobile-toggle{display:flex}
  .main-content{margin-left:0}
  .hero{padding:var(--s-3xl) var(--s-lg);min-height:90vh}
  .section-wrap{padding:var(--s-2xl) var(--s-lg)}
  .pillar{flex-direction:column;gap:var(--s-md)}
  .cards-grid{grid-template-columns:1fr}
  .flip-card{height:240px}
  .comment-form-row{grid-template-columns:1fr}
  .quiz-results-breakdown{flex-direction:column;gap:var(--s-lg)}
  .tab-nav{overflow-x:auto}
  .tab-btn{font-size:0.82rem;padding:var(--s-sm) var(--s-md)}

  /* Reveal cards: always show detail on mobile */
  .reveal-card-detail{
    max-height:200px !important;
    margin-top:var(--s-md) !important;
    opacity:1 !important;
  }
  .reveal-hint{display:none}
}
@media(max-width:480px){
  html{font-size:15px}
  .hero h1{font-size:2rem}
  .hero-actions{flex-direction:column;align-items:stretch}
  .btn{justify-content:center}
  .quiz-question{padding:var(--s-lg)}
  .stats-row{grid-template-columns:repeat(2,1fr)}
  .timeline-item{gap:var(--s-md)}
  .timeline-marker{width:36px}
  .timeline-dot{width:32px;height:32px;font-size:0.6rem}
}

.sidebar-overlay{
  display:none;position:fixed;inset:0;
  background:rgba(0,0,0,0.3);z-index:999;
  opacity:0;transition:opacity var(--t-base);
}
.sidebar-overlay.active{display:block;opacity:1}