/* =========================================================
   Asociación ABM — Hoja de estilos principal
   Paleta extraída del sitio institucional (abm.edu.ar)
   ========================================================= */

:root {
  --color-primary: #DA1735;
  --color-primary-dark: #B01329;
  --color-primary-light: #FDEAEC;
  --color-gray: #58595B;
  --color-gray-light: #8A8B8D;
  --color-dark: #2A2A2A;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7F7F7;
  --color-border: #E7E7E7;

  --font-heading: 'Poppins', 'Segoe UI', Arial, sans-serif;
  --font-body: 'Source Sans Pro', 'Segoe UI', Arial, sans-serif;

  --radius: 10px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,.06);
  --shadow-md: 0 8px 24px rgba(0,0,0,.10);
  --header-height: 82px;
  --max-width: 1180px;
}

/* ---------- Reset básico ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-dark);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-dark); }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-dark);
  line-height: 1.25;
  margin: 0 0 .6em;
}
p { margin: 0 0 1em; }
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 10px 18px;
  z-index: 2000;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------- Botones ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: .95rem;
  padding: 13px 26px;
  border-radius: 999px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all .2s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.btn-primary:hover { background: var(--color-primary-dark); border-color: var(--color-primary-dark); color: #fff; }
.btn-outline { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn-outline:hover { background: var(--color-primary); color: #fff; }
.btn-white { background: #fff; color: var(--color-primary); border-color: #fff; }
.btn-white:hover { background: transparent; color: #fff; }
.btn-sm { padding: 9px 18px; font-size: .85rem; }
.btn-block { width: 100%; justify-content: center; }

.section-tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: .78rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 14px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: #fff;
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
  display: flex;
  align-items: center;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand-logo { height: 48px; width: 48px; object-fit: contain; }

.main-nav { display: flex; align-items: center; gap: 22px; flex: 1; justify-content: flex-end; }
.main-nav > ul { display: flex; gap: 18px; flex-wrap: nowrap; }
.main-nav > ul li { flex: none; }
.main-nav > ul a {
  display: block;
  color: var(--color-dark);
  font-weight: 600;
  font-size: .92rem;
  padding: 8px 2px;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}
.main-nav > ul a:hover,
.main-nav > ul a.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.nav-cta { display: flex; gap: 10px; flex: none; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  display: block;
  height: 3px;
  width: 100%;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform .25s ease, opacity .25s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

.nav-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  z-index: 900;
}
.nav-backdrop.visible { display: block; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  padding: 84px 0;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -120px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: rgba(255,255,255,.06);
}
.hero-inner { position: relative; z-index: 1; max-width: 680px; }
.hero .section-tag { background: rgba(255,255,255,.15); color: #fff; }
.hero h1 { color: #fff; font-size: clamp(2rem, 4vw, 3rem); }
.hero p.lead { font-size: 1.15rem; color: rgba(255,255,255,.9); max-width: 560px; }
.hero-actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }

.hero-sm {
  padding: 56px 0;
}
.hero-sm h1 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); }
.breadcrumb { font-size: .85rem; color: rgba(255,255,255,.85); margin-bottom: 14px; }
.breadcrumb a { color: #fff; text-decoration: underline; }

/* ---------- Secciones genéricas ---------- */
section { padding: 72px 0; }
.section-alt { background: var(--color-bg-alt); }
.section-head { max-width: 640px; margin-bottom: 44px; }
.section-head.centered { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); }
.section-head p { color: var(--color-gray); }

/* ---------- Grids / Cards ---------- */
.grid { display: grid; gap: 28px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease;
  height: 100%;
  display: flex;
  flex-direction: column;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.card > img:first-child { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; }
.card-body { padding: 24px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.card-body h3 { font-size: 1.15rem; margin-bottom: 4px; }
.card-body p { color: var(--color-gray); font-size: .95rem; flex: 1; }
.card-tag {
  align-self: flex-start;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .5px;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 10px;
  border-radius: 999px;
}

/* Tarjetas institucionales (Instituto / Radio / Teatro) */
.pillar-card { text-align: left; border-top: 4px solid var(--color-primary); }
.pillar-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: var(--color-primary-light);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-primary);
  margin-bottom: 6px;
}
.pillar-icon svg { width: 28px; height: 28px; }

/* ---------- Stats ---------- */
.stats-band {
  background: var(--color-dark);
  color: #fff;
  padding: 48px 0;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-number { font-family: var(--font-heading); font-size: 2.4rem; font-weight: 700; color: var(--color-primary); }
.stat-label { color: rgba(255,255,255,.75); font-size: .9rem; }

/* ---------- Novedades / Slider ---------- */
.news-slider { display: flex; gap: 24px; overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 12px; }
.news-slider .card { min-width: 300px; scroll-snap-align: start; }
.news-slider::-webkit-scrollbar { height: 8px; }
.news-slider::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 8px; }

.news-meta { display: flex; justify-content: space-between; font-size: .78rem; color: var(--color-gray-light); }

.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 32px; }
.filter-btn {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: .85rem;
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: #fff;
  cursor: pointer;
  transition: all .2s ease;
}
.filter-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.filter-btn.active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.news-item.hidden { display: none; }

/* ---------- Testimonios ---------- */
.testimonial-slider { position: relative; max-width: 720px; margin: 0 auto; text-align: center; min-height: 220px; }
.testimonial-slide { display: none; }
.testimonial-slide.active { display: block; animation: fadeIn .4s ease; }
.testimonial-slide blockquote {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-dark);
  margin: 0 0 18px;
}
.testimonial-author { color: var(--color-gray); font-size: .9rem; }
.testimonial-dots { display: flex; justify-content: center; gap: 8px; margin-top: 24px; }
.testimonial-dots button {
  width: 10px; height: 10px; border-radius: 50%;
  border: none; background: var(--color-border); cursor: pointer; padding: 0;
}
.testimonial-dots button.active { background: var(--color-primary); }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }

/* ---------- Galería de fotos ---------- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.gallery-item {
  display: block;
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--color-bg-alt);
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .35s ease;
}
.gallery-item:hover img { transform: scale(1.06); }
.gallery-item.wide { grid-column: span 2; aspect-ratio: 21 / 9; }

/* ---------- Lightbox ---------- */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.92);
  align-items: center;
  justify-content: center;
  padding: 60px;
  z-index: 2000;
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: 90%;
  max-height: 85vh;
  border-radius: 6px;
  box-shadow: var(--shadow-md);
}
.lightbox-close {
  position: absolute;
  top: 18px;
  right: 22px;
  background: none;
  border: none;
  color: #fff;
  font-size: 2.2rem;
  line-height: 1;
  cursor: pointer;
}
.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,.12);
  color: #fff;
  font-size: 1.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.lightbox-nav:hover { background: var(--color-primary); }
.lightbox-prev { left: 18px; }
.lightbox-next { right: 18px; }

/* ---------- Tabs (Teatro del Globo) ---------- */
.tabs { border-bottom: 2px solid var(--color-border); display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 32px; }
.tab-btn {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: .95rem;
  padding: 14px 20px;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  color: var(--color-gray);
}
.tab-btn:hover { color: var(--color-primary); }
.tab-btn.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.tab-panel { display: none; animation: fadeIn .35s ease; }
.tab-panel.active { display: block; }

/* ---------- Acordeón (FAQ) ---------- */
.accordion-item { border-bottom: 1px solid var(--color-border); }
.accordion-trigger {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 18px 4px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-dark);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}
.accordion-trigger .icon { color: var(--color-primary); font-size: 1.3rem; transition: transform .25s ease; }
.accordion-trigger[aria-expanded="true"] .icon { transform: rotate(45deg); }
.accordion-panel { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.accordion-panel-inner { padding: 0 4px 18px; color: var(--color-gray); }

/* ---------- Timeline (Historia) ---------- */
.timeline { position: relative; margin-left: 12px; padding-left: 30px; border-left: 2px solid var(--color-border); }
.timeline-item { position: relative; padding-bottom: 40px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -37px;
  top: 4px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--color-primary);
}
.timeline-year { font-family: var(--font-heading); font-weight: 700; color: var(--color-primary); font-size: 1.1rem; }

/* ---------- Equipo / Autoridades ---------- */
.team-card { text-align: center; padding: 28px 20px; }
.team-photo {
  width: 96px; height: 96px; border-radius: 50%;
  background: var(--color-bg-alt);
  border: 3px solid var(--color-primary-light);
  margin: 0 auto 16px;
  display: flex; align-items: center; justify-content: center;
  color: var(--color-gray-light);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.4rem;
}
.team-role { color: var(--color-primary); font-size: .85rem; font-weight: 600; }

/* ---------- CTA banda ---------- */
.cta-band {
  background: var(--color-primary);
  color: #fff;
  padding: 56px 0;
  text-align: center;
}
.cta-band h2 { color: #fff; }
.cta-band p { color: rgba(255,255,255,.9); max-width: 560px; margin-left: auto; margin-right: auto; }

/* ---------- Formularios ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group.full { grid-column: 1 / -1; }
label { font-weight: 600; font-size: .9rem; }
input, select, textarea {
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: #fff;
  color: var(--color-dark);
  width: 100%;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.field-error { color: var(--color-primary-dark); font-size: .82rem; min-height: 1.1em; }
input.invalid, textarea.invalid, select.invalid { border-color: var(--color-primary-dark); }

.alert {
  padding: 16px 18px;
  border-radius: 8px;
  margin-bottom: 24px;
  font-weight: 600;
}
.alert-success { background: #E9F7EF; color: #1E7E34; border: 1px solid #C3E6CB; }
.alert-error { background: var(--color-primary-light); color: var(--color-primary-dark); border: 1px solid #f5c2c7; }

/* ---------- Info / contacto ---------- */
.info-list { display: flex; flex-direction: column; gap: 18px; }
.info-list li { display: flex; gap: 14px; align-items: flex-start; }
.info-icon {
  width: 40px; height: 40px; flex: none;
  border-radius: 10px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
}
.map-embed { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--color-border); }
.map-embed iframe { width: 100%; height: 320px; border: 0; display: block; }

/* ---------- Footer ---------- */
.site-footer { background: #1D1D1F; color: #C9C9CB; padding-top: 64px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 32px; padding-bottom: 48px; }
.footer-logo-badge {
  display: inline-flex;
  background: #fff;
  border-radius: 12px;
  padding: 8px;
  margin-bottom: 14px;
}
.footer-logo { height: 40px; width: 40px; object-fit: contain; display: block; }
.footer-brand p { color: #9d9da0; font-size: .92rem; }
.footer-col h3 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { color: #C9C9CB; font-size: .92rem; }
.footer-col a:hover { color: #fff; }
.footer-contact li { color: #9d9da0; font-size: .92rem; }
.social-links { display: flex; gap: 12px; margin-top: 6px; }
.social-links a {
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(255,255,255,.08);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
}
.social-links a:hover { background: var(--color-primary); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 20px 0; }
.footer-bottom-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; font-size: .82rem; color: #8b8b8e; }

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all .25s ease;
  z-index: 500;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }

/* ---------- Utilidades ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 992px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
}

@media (max-width: 768px) {
  :root { --header-height: 68px; }
  .brand-logo { height: 38px; width: 38px; }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    width: min(320px, 84%);
    height: calc(100vh - var(--header-height));
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 28px 24px;
    box-shadow: -8px 0 24px rgba(0,0,0,.12);
    transform: translateX(100%);
    transition: transform .3s ease;
    z-index: 950;
    overflow-y: auto;
  }
  .main-nav.open { transform: translateX(0); }
  .main-nav > ul { flex-direction: column; gap: 4px; }
  .main-nav > ul a { display: block; padding: 12px 4px; border-bottom: 1px solid var(--color-border); }
  .nav-cta { flex-direction: column; margin-top: 20px; }
  .nav-toggle { display: flex; }

  .grid-3, .grid-4, .grid-2, .form-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .lightbox { padding: 24px; }
  .lightbox-nav { width: 38px; height: 38px; font-size: 1.4rem; }
  .footer-grid { grid-template-columns: 1fr; text-align: left; }
  section { padding: 52px 0; }
  .hero { padding: 56px 0; }
  .footer-bottom-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 18px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .stats-grid { grid-template-columns: 1fr; }
}