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

:root {
  --red: #273ed4;
  --red-dark: #2c3fb6;
  --ink: #191919;
  --muted: #666;
  --paper: #fff;
  --ice: #dce9ec;
  --line: #e4e5e5;
  --blue: #0e4ba9;
  --blue-2: #15498d;
  --footer: #1d1d1f;
  --radius: 12px;
  --shadow: 0 8px 22px rgba(36, 24, 24, .08);
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: 'Open Sans', Arial, sans-serif;
  line-height: 1.55;
}
img { display: block; width: 100%; height: auto; }
a { color: inherit; }
.container { width: min(calc(100% - 48px), var(--max)); margin-inline: auto; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; left: 16px; top: -60px; z-index: 1000;
  background: var(--ink); color: white; padding: 10px 14px; border-radius: 6px;
}
.skip-link:focus { top: 16px; }

/* Header */
.site-header {
  top: 0; 
  z-index: 100;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid rgba(0,0,0,.04);
  backdrop-filter: blur(8px);
}
.header-inner { min-height: 78px; display:flex; align-items:center; justify-content:space-between; gap: 30px; }
.header-inner-brands {display:flex; gap: 20px;}
.brand { display:block; max-width: 48%; }
.brand img { max-height: 52px; }
.main-nav { display:flex; align-items:center; gap: 30px; font-size: 15px; font-weight: 600;}
.main-nav a { text-decoration:none; color:#555; }
.main-nav a:hover, .main-nav a:focus, .main-nav .active { color: var(--red); }

/* Hero */
.hero {
  position: relative;
  min-height: 600px;
  overflow: hidden;
  display: grid;
  place-items: center;
  background: url("../images/Semana_ciencia_innovacion-fondo-hero-V2.jpg") center/cover no-repeat;

}
.hero::before {
  content: '';
  position:absolute; inset:0;
  opacity:.6;
}

.hero-content { position:relative; z-index: 2; text-align:center; padding: 58px 0 65px; }
.edition-pill {
  display:inline-block; margin:0 0 18px; padding: 6px 14px; border-radius:999px;
  background:var(--red); 
  color:#c6ccf0; font-weight:700; font-size: 16px;
}
.hero h1 {
  margin: 0; font: 600 clamp(32px, 4.4vw, 58px)/.98 'unbounded', Arial, sans-serif;
  letter-spacing: -.03em;
  color: #fff;
  line-height: 110%;
}
.edition-name { margin: 25px 0 4px; font-size: 22px; color:#fff; font-weight:300; font-family: "unbounded", sans-serif; text-transform: uppercase;}
.hero-note { margin:0; color:#fff; font-size: 18px; }

/* Intro */
.intro-section { padding: 60px 0 70px; background:#fff; }
.intro-container { text-align:center; }
.intro-copy { max-width: 770px; margin:0 auto 38px; font-size: 18px; color:#555; }
.stats-grid { display:grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.stat-card {
  text-align:left; padding: 20px 24px; border:2px solid #eee; border-radius: 12px; box-shadow: var(--shadow);
  min-height: 120px; background:white;
}
.stat-card a {
  text-decoration: none;
}
.stat-eyebrow { display:block; color:var(--red); font:700 12px/1.25 'Montserrat', sans-serif; min-height: 40px; }
.stat-card strong { display:block; margin-top: 9px; font: 400 40px/1.25 'Montserrat', sans-serif;
font-family: "League Gothic", sans-serif;
text-transform: uppercase;
letter-spacing: -2%;
color: #333;
}
.stat-card strong span { font-weight: 700; }
.stat-card i {
  color: #273ed4e8; 
  font-size: 18px; 
  width: 36px; 
  margin-bottom: 12px;
  text-align: center; 
  display: inline-block; 
  vertical-align: middle;
  background-color: #c6ccf03f;
  padding: 8px;
  border-radius: 10px;

}
.intro-actions { margin-top: 60px; display:flex; justify-content:center; gap: 12px; }
.button { display:inline-flex; align-items:center; justify-content:center; min-width:118px; padding:12px 18px; border-radius:6px; text-decoration:none; font:700 16px 'Open Sans', sans-serif; }
.button-primary { color:white; background:#3A3A3A; box-shadow:0 6px 16px rgba(29, 69, 199, 0.2); }
.button-primary:hover, .button-primary:focus { background:var(--ink); }
.button-secondary { color:#3A3A3A; border:2px solid #3A3A3A; background:#fff; }
.button-secondary:hover, .button-secondary:focus { background:#c6ccf018; }

/* EU banner */
.eu-banner { background: linear-gradient(90deg, rgba(0, 0, 0, 0.8), rgba(17, 17, 17, 0.2)), url('../images/Semana_ciencia_innovacion-fondo-hero-V2.jpg') center/cover no-repeat; color:#fff; }
.eu-inner { min-height: 185px; display:flex; align-items:center; gap: 34px; }
.eu-stars {
  flex:0 0 120px; display:grid; grid-template-columns:repeat(4,1fr); place-items:center; gap:1px;
  font-size:23px; line-height:1; color:#ffd83f;
  padding: 60px 0px;
}
.eu-inner p { margin:0; font-size: 16px; line-height:1.55; max-width: 850px;}
.eu-stars img {
  width: 180px;
}

/* Activities */
.activities-section { background: #E3E5F2; padding: 70px 0 85px; }
.section-heading { text-align:center; }
.section-heading .edition-pill { margin-bottom: 28px; }
.section-heading h2 { margin:0 0 36px; font:600 clamp(33px, 4vw, 48px)/1 'unbounded', sans-serif; }
.filters { position:relative; margin-bottom: 40px;}

.filter-button {
  display:inline-flex; align-items:center; justify-content:center; margin: 0 4px 18px 0; padding:8px 12px;
  background:white; border-radius:5px; border:1px solid rgba(0,0,0,.04); color:var(--red); font:700 14px 'Open Sans', sans-serif; cursor:pointer;
}
.filter-button{
    transition:
      background-color .2s ease,
      color .2s ease,
      border-color .2s ease;
}
.filter-button:hover, .filter-input:focus + .filter-button { box-shadow: 0 0 0 2px rgba(29, 69, 199, 0.18); }
.filter-button.active{
    background: var(--red);
    color: white;
    border-color: var(--red);
}

.filter-button.active:hover{
    background: var(--red-dark);
}

.activities-grid { display:grid; grid-template-columns:repeat(3, minmax(0,1fr)); gap: 30px 20px; }
.activity-card {
  min-width:0; overflow:hidden; background:white; border-radius: 11px; box-shadow: 0 5px 18px rgba(40,55,55,.09);
  transition: transform .18s ease, box-shadow .18s ease;
}
.activity-card:hover { transform: translateY(-3px); box-shadow:0 12px 24px rgba(40,55,55,.13); }
.activity-card img { aspect-ratio: 1.72 / 1; object-fit:cover; background:#d4dee0; }
.activity-content { padding: 16px 16px 19px; min-height: 160px; }
.activity-type { margin:0 0 3px; font:700 12px/1.2 'Montserrat', sans-serif; color: #333;}
.activity-entity { margin:0 0 10px; color:var(--red); font:700 12px/1.2 'Montserrat', sans-serif; }
.activity-card h3 { margin: 0 0 10px; font:700 17px/1.18 'Montserrat', sans-serif; letter-spacing:-.01em; color: #333;}
.activity-date { margin:0; color:#666; font-size: 14px; }

.activity-card{
    position:relative;
    cursor:pointer;
}

.activity-overlay{
    position:absolute;
    inset:0;
    background:rgba(0,0,0,.35);
    display:flex;
    align-items:center;
    justify-content:center;
    opacity:0;
    transition:.25s;
}

.activity-plus{
    color:white;
    font-size:5rem;
    line-height:1;
    font-weight:300;
}

.activity-card:hover .activity-overlay{
    opacity:1;
}

.activity-detail{
    display:none;
    background:white;
    border-radius:24px;
    overflow:visible;
    margin-bottom:40px;
    box-shadow:0 20px 40px rgba(0,0,0,.08);
    position: relative;
    grid-template-columns:
        42%
        58%;
}

.activity-detail.active{
    display:grid;
}

.detail-image img{
    width:100%;
    height:100%;
    object-fit:cover;
}

.detail-content{
    padding:40px;
}

.detail-close{
    position:absolute;
    right:25px;
    top:25px;
    border:none;
    background:none;
    font-size:2rem;
    cursor:pointer;
    display:block !important;
    position:absolute;
    top:20px;
    right:20px;
    color: #666;
}

.detail-head{
    display:flex;
    gap:12px;

    font-size:12px;
    font-weight:700;
    text-transform:uppercase;
}

.detail-head p:last-child{
    color:var(--red);
}

.detail-subtitle{
    color:var(--red);
    font-weight:700;
}

.detail-meta{
    margin-top:30px;
    border-top:1px solid #eee;
    padding-top:20px;

    display:grid;
    gap:0px;
}

.detail-meta div{
    display:grid;
    grid-template-columns:
        180px
        1fr;
}

.detail-actions{
    margin-top:30px;

    display:flex;
    justify-content:space-between;
    align-items:center;
}

.detail-meta{
    margin-top:18px;
    padding-top:8px;
    border-top:1px solid #e5e5e5;
}

.detail-meta > div{
    display:grid;
    grid-template-columns:180px 1fr;
    gap:24px;

    padding:4px 0;
}

.detail-meta strong{
    color: var(--red);
    font-weight:700;
}

.detail-meta span{
    color:#333;
    line-height:1.5;
}


/* Pure CSS filter states */
#filter-presenciales:checked ~ .activities-grid .activity-card:not(.presencial),
#filter-online:checked ~ .activities-grid .activity-card:not(.online),
#filter-conferencias:checked ~ .activities-grid .activity-card:not(.conferencia),
#filter-ign:checked ~ .activities-grid .activity-card:not(.ign),
#filter-oam:checked ~ .activities-grid .activity-card:not(.oam) { display:none; }

/* Footer */
.site-footer { background:var(--footer); color:#fff; padding: 60px 0 18px; }
.footer-grid { display:grid; grid-template-columns: 2.2fr 1fr 1fr; gap: 50px; padding-bottom: 42px; }
.footer-grid h2 { margin:0 0 18px; font:700 15px 'Montserrat', sans-serif; }
.footer-grid p, .footer-grid a { display:block; margin:0 0 9px; color:#bdbdbf; text-decoration:none; font-size:10px; }
.footer-grid > div:first-child a { color:#fff; font-weight:700; margin-top: 16px; }
.footer-grid a:hover, .footer-grid a:focus { color:#fff; text-decoration:underline; }
.footer-bottom { border-top:1px solid rgba(255,255,255,.1); padding-top: 14px; display:flex; justify-content:space-between; gap:20px; }
.footer-bottom p { margin:0; font-size:9px; color:#929295; }

@media (max-width: 900px) {
  .brand { max-width: 40%; }
  .main-nav { gap: 18px; }
  .activities-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .eu-inner { padding: 26px 0; }
}

@media (max-width: 680px) {
  .container { width:min(calc(100% - 28px), var(--max)); }
  .header-inner { min-height:72px; flex-wrap:wrap; padding: 12px 0; }
  .brand { max-width: 45%; }
  .main-nav { display: none; width:100%; justify-content:space-between; font-size:11px; order:2; padding-bottom: 3px; }
  .hero { min-height:330px; }
  .hero-content { padding: 45px 0 55px; }
  .hero h1 { font-size: 34px; }
  .stats-grid, .activities-grid, .footer-grid { grid-template-columns:1fr; }
  .intro-section { padding-top:45px; }
  .intro-copy { font-size:14px; }
  .eu-inner {
    flex-direction: column;    /* Apila los elementos verticalmente */
    align-items: center;       /* Centra las estrellas sobre el bloque */
    padding: 32px 20px;           /* Reducimos el espaciado vertical global */
    gap: 16px;                 /* Separación entre estrellas y texto */
  }
  .eu-stars {
    flex: 0 0 auto;            /* Eliminamos la restricción lateral de ancho */
    padding: 0;                /* Quitamos el padding de 60px que traía de desktop */
    width: auto;
  }
  .eu-stars img {
    width: 140px;              /* Ancho adecuado y proporcional para pantallas móviles */
    margin: 0 auto;
  }
  .eu-inner p {
    font-size: 14px;           /* Ajuste por usabilidad y accesibilidad */
    line-height: 1.6;
    text-align: left;          /* O 'center' si prefieres alineación central en móvil */
  }
  .filter-button { margin-right:2px; margin-bottom:8px; font-size:9px; }
  .activity-card h3 { font-size:16px; }
  .footer-bottom { flex-direction:column; }

  /* 1. Apilar tarjeta desplegada en una sola columna */
  .activity-detail {
    grid-template-columns: 1fr; /* Cambia de 2 columnas a 1 columna vertical */
  }

  /* 2. Control del alto de imagen arriba */
  .detail-image {
    max-height: 220px;          /* Evita que la foto ocupe toda la pantalla */
    overflow: hidden;
    border-radius: 24px 24px 0 0;
  }

  .detail-image img {
    width: 100%;
    height: 220px;
    object-fit: cover;         /* Recorta la foto limpiamente sin deformar */
  }

  /* 3. Reajuste de espaciados internos */
  .detail-content {
    padding: 24px 18px;        /* Bajamos el padding de 40px para ganar área útil */
  }

  /* 4. Reparación de la tabla de metadatos (Fecha, Dirigido a, etc.) */
  .detail-meta > div {
    grid-template-columns: 115px 1fr; /* Bajamos de 180px a 115px para la columna azul */
    gap: 10px;                        /* Reducimos el espacio excesivo */
  }
  .detail-close {
    color: #fff;
  }
  
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior:auto; }
  .activity-card { transition:none; }
}


#detailTitle {
  font-size: 20px;
  font-weight: bolder !important;
  margin: 0px;
}

#detailDescription {
  font-size: 14px;
  margin: 0px;
  padding: 0px;
}

#detailSpeaker {
  margin: 6px 0 0 0;
}

#detailDate {
  margin: 12px 0 4px 0;
}

.detail-meta > * {
  font-size: 13px;
}

/* ==========================================
   BOTÓN VOLVER ARRIBA (FLOATING BUTTON)
   ========================================== */
.btn-scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    background-color: #D1D5DB; /* Gris discreto y neutro según la imagen */
    color: #fff; /* Icono blanco */
    border-radius: 6px; /* Esquinas ligeramente suavizadas como en tu captura */
    
    /* Centrado perfecto del icono dentro del cuadrado */
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    
    /* Prioridad visual para que flote por encima de tarjetas y sombras */
    z-index: 999; 
    
    /* Efecto de transición suave */
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

/* Comportamiento UX Interactivo (Hover) */
.btn-scroll-top:hover {
    background-color: #9CA3AF; /* Se oscurece un poco al pasar el cursor (Affordance) */
    transform: translateY(-4px); /* Pequeña elevación interactiva */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}