:root {
  --bg: #fcfbff;
  --surface: #ffffff;
  --surface-2: #f6f2ff;
  --text: #1f1d2b;
  --muted: #5e5a72;
  --line: #e6dff5;
  --accent: #6b3fd1;
  --accent-2: #9c6bff;
  --shadow: 0 12px 30px rgba(63, 39, 117, 0.08);
  --accent-gradient: linear-gradient(135deg, var(--accent), var(--accent-2));
  --radius: 20px;
  --container: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(180deg, #fff 0%, var(--bg) 100%);
  color: var(--text);
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { width: min(var(--container), calc(100% - 2rem)); margin: 0 auto; }
.section { padding: 4.5rem 0; }
.section.alt { background: linear-gradient(180deg, var(--surface-2) 0%, #fff 100%); }
.section-head { max-width: 780px; margin-bottom: 2.5rem; }
.section-head p { font-size: 1.05rem; line-height: 1.7; max-width: 640px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  background: #f1eaff; color: var(--accent); border: 1px solid #dfd2ff;
  border-radius: 999px; padding: .35rem .8rem; font-size: .8rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.04em;
}
h1, h2, h3 { line-height: 1.15; margin: 0 0 1rem; }
h1 { font-size: clamp(2.4rem, 4vw, 4.4rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.8rem, 3vw, 2.8rem); letter-spacing: -0.02em; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1rem; color: var(--muted); }
ul.feature-list { padding-left: 1.1rem; color: var(--muted); }
.button-row { display: flex; flex-wrap: wrap; gap: .9rem; margin-top: 1.6rem; }
.button {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .95rem 1.3rem; border-radius: 14px; font-weight: 700; border: 1px solid transparent;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.button:hover { text-decoration: none; transform: translateY(-1px); }
.button.primary { background: var(--accent); color: #fff; box-shadow: var(--shadow); }
.button.secondary { background: var(--surface); color: var(--accent); border-color: var(--line); }
.button.ghost { background: transparent; color: var(--accent); border-color: #d9ccfb; }
.button.small { padding: .7rem 1rem; border-radius: 12px; font-size: .95rem; }
.topbar {
  position: sticky; top: 0; z-index: 70;
  backdrop-filter: blur(14px); background: rgba(255,255,255,0.82); border-bottom: 1px solid rgba(230, 223, 245, 0.8);
}
.nav { display: flex; align-items: center; justify-content: space-between; min-height: 78px; gap: 1rem; }
.brand { font-weight: 800; color: var(--text); letter-spacing: -0.02em; display: flex; align-items: center; gap: .5rem; }
.brand-logo { height: 44px; width: auto; }
.hero-logo { height: 88px; width: auto; display: block; margin-bottom: 1.25rem; }
.nav-links { display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; }
.nav-links a { color: var(--muted); font-weight: 600; }
.nav-toggle { display: none; }
.hero { padding: 5rem 0 4rem; }
.hero h1 {
  background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: stretch; }
.hero-card, .panel {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
}
.hero-card { padding: 2rem; }
.hero-visual {
  min-height: 380px; display: grid; place-items: center; padding: 2rem; position: relative; overflow: hidden;
  background: linear-gradient(135deg, #f2eaff, #e8dfff, #f9f6ff, #fff);
  background-size: 400% 400%; animation: hero-gradient 12s ease infinite;
}
.hero-visual::before, .hero-visual::after {
  content: ""; position: absolute; border-radius: 999px; background: rgba(107, 63, 209, 0.08);
}
.hero-visual::before { width: 230px; height: 230px; top: -30px; right: -50px; animation: float 6s ease-in-out infinite; }
.hero-visual::after { width: 180px; height: 180px; bottom: -40px; left: -30px; animation: float 6s ease-in-out infinite; animation-delay: -3s; }
.hero-badge {
  position: relative; z-index: 1; background: #fff; border: 1px dashed #ceb9ff; color: var(--muted);
  padding: 1rem; border-radius: 16px; text-align: center; max-width: 360px;
}
.hero-img {
  position: relative; z-index: 1; width: 100%; height: 100%; object-fit: cover; border-radius: 18px;
}
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 2rem; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 1rem 1.1rem; }
.stat strong { display: block; font-size: 1.4rem; color: var(--accent); }
.grid-2, .grid-3 { display: grid; gap: 1.25rem; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.3rem; box-shadow: var(--shadow);
}
.card.speaker-card { position: relative; }
.speaker-avatar {
  position: absolute; top: 1.2rem; right: 1.2rem; width: 72px; height: 72px; border-radius: 50%;
  object-fit: cover; border: 3px solid #e2d5ff; box-shadow: 0 2px 8px rgba(107, 63, 209, .15);
}
.speaker-card h3 { padding-right: 80px; }
.speaker-card .meta { padding-right: 80px; }
.card .meta { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: .75rem; }
.chip {
  display: inline-flex; align-items: center; font-size: .8rem; font-weight: 700; color: var(--accent);
  background: #f1eaff; border: 1px solid #e2d5ff; border-radius: 999px; padding: .3rem .65rem;
}
.card p:last-child { margin-bottom: 0; }
.card-links { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1rem; }
.split {
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 1.5rem; align-items: start;
}
.notice { font-size: .95rem; color: var(--muted); background: #fffdf7; border: 1px solid #f4e7b9; padding: 1rem; border-radius: 16px; }

/* Notas provisionales para el desarrollador */
.dev-note {
  color: #1d4e89; background: #e8f0fe; border: 1px dashed #2563ac; border-radius: 12px;
  padding: .6rem 1rem; font-size: .9rem; font-style: italic;
}
.filter-row { display: flex; flex-wrap: wrap; gap: .75rem; margin-bottom: 1.5rem; }
.tag-banner { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.tag-button {
  cursor: pointer; border: 1px solid #d9ccfb; background: #fff; color: var(--accent); font-weight: 600;
  border-radius: 999px; padding: .35rem .75rem; font-size: .8rem; transition: background .2s, color .2s;
}
.tag-button:hover { background: #f1eaff; }
.tag-button.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.filter-button {
  cursor: pointer; border: 1px solid #d9ccfb; background: #fff; color: var(--accent); font-weight: 700;
  border-radius: 999px; padding: .65rem 1rem;
}
.filter-button.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.gallery-grid {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem;
}
.gallery-item {
  background: var(--surface); border: 1px solid var(--line); border-radius: 18px; overflow: hidden; box-shadow: var(--shadow);
}
.gallery-item button { width: 100%; background: transparent; border: 0; padding: 0; cursor: pointer; text-align: left; }
.gallery-item img { width: 100%; height: auto; object-fit: contain; }
.gallery-item .caption { padding: .9rem 1rem 1rem; }
.gallery-item strong { display: block; font-size: 1rem; }
.lightbox {
  position: fixed; inset: 0; background: rgba(16, 12, 32, 0.75); display: grid; place-items: center; padding: 1rem; z-index: 100;
}
.lightbox-content {
  background: #fff; max-width: 960px; width: 100%; border-radius: 20px; overflow: hidden; box-shadow: 0 24px 80px rgba(0,0,0,.35);
}
.lightbox-body { padding: 1rem; }
.lightbox-top { display: flex; justify-content: space-between; align-items: center; padding: 1rem 1rem 0; }
.close-button { border: 0; background: #f1eaff; color: var(--accent); width: 40px; height: 40px; border-radius: 999px; cursor: pointer; font-size: 1.2rem; }
.site-footer {
  padding: 3.5rem 0 2rem; background: var(--surface-2);
  border-top: 3px solid transparent; border-image: var(--accent-gradient) 1;
}
.footer-grid { display: grid; grid-template-columns: 1fr 1.3fr 1fr; gap: 2rem; align-items: start; }
.footer-links { display: flex; flex-wrap: wrap; gap: .6rem; }
.footer-link-group { margin-bottom: 1.2rem; }
.footer-heading { font-size: .85rem; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; margin: 0 0 .5rem; }
.footer-faculties { padding-top: 1.2rem; margin-top: 1.2rem; border-top: 1px solid var(--line); }
.footer-logos { display: flex; flex-wrap: wrap; align-items: center; gap: 1.5rem; padding-top: 1.5rem; margin-top: 1.5rem; border-top: 1px solid var(--line); }
.footer-logos a { display: flex; align-items: center; justify-content: center; width: 140px; height: 46px; }
.footer-logos img { width: 100%; height: 100%; object-fit: contain; object-position: center; opacity: .7; transition: opacity .2s; }
.footer-logos img:hover { opacity: 1; }
.kicker { font-weight: 800; color: var(--text); }
.muted-small { color: var(--muted); font-size: .95rem; }
.anchor-offset { scroll-margin-top: 100px; }
.empty-state {
  border: 1px dashed #d8c8ff; border-radius: 18px; padding: 1rem; color: var(--muted); background: #fcfaff;
}

/* Scroll nav indicator */
.scroll-nav {
  position: fixed; right: 1.2rem; top: 50%; transform: translateY(-50%); z-index: 30;
  display: flex; flex-direction: column; align-items: flex-end; gap: .6rem;
}
.scroll-nav-dot {
  display: flex; align-items: center; gap: .5rem; text-decoration: none; transition: all .25s ease;
}
.scroll-nav-dot span {
  font-size: .75rem; font-weight: 600; color: var(--muted); opacity: 0; transform: translateX(6px);
  transition: opacity .25s ease, transform .25s ease; white-space: nowrap; pointer-events: none;
}
.scroll-nav-dot::after {
  content: ""; flex-shrink: 0; width: 10px; height: 10px; border-radius: 50%;
  background: #d9ccfb; border: 2px solid #fff; box-shadow: 0 1px 4px rgba(107,63,209,.2);
  transition: background .25s ease, transform .25s ease;
}
.scroll-nav-dot:hover span { opacity: 1; transform: translateX(0); }
.scroll-nav-dot:hover::after { background: var(--accent-2); transform: scale(1.2); }
.scroll-nav-dot.active::after { background: var(--accent); transform: scale(1.3); }
.scroll-nav-dot.active span { opacity: 1; transform: translateX(0); color: var(--accent); }

/* ── Animations & transitions ── */
@keyframes hero-gradient {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

/* Scroll reveal */
.reveal {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal:nth-child(2) { transition-delay: 0.1s; }
.reveal:nth-child(3) { transition-delay: 0.2s; }
.reveal:nth-child(4) { transition-delay: 0.3s; }
.reveal:nth-child(5) { transition-delay: 0.4s; }
.reveal:nth-child(6) { transition-delay: 0.5s; }

/* Card hover */
.card {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(63, 39, 117, 0.14);
}

/* Gallery hover */
.gallery-item {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.gallery-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(63, 39, 117, 0.14);
}
.gallery-item img { transition: transform 0.35s ease; }
.gallery-item:hover img { transform: scale(1.05); }

/* Lightbox transitions */
.lightbox {
  opacity: 0; transition: opacity 0.3s ease;
  visibility: hidden; pointer-events: none;
}
.lightbox.open {
  opacity: 1; visibility: visible; pointer-events: auto;
}
.lightbox-content {
  transform: scale(0.95) translateY(10px);
  transition: transform 0.3s ease;
}
.lightbox.open .lightbox-content {
  transform: scale(1) translateY(0);
}
.lightbox-nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: rgba(255,255,255,0.9); border: 1px solid var(--line); color: var(--accent);
  width: 44px; height: 44px; border-radius: 50%; cursor: pointer; font-size: 1.3rem;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.lightbox-nav:hover { background: #fff; box-shadow: 0 4px 16px rgba(0,0,0,0.15); }
.lightbox-nav.prev { left: 1rem; }
.lightbox-nav.next { right: 1rem; }

/* Active nav indicator */
.nav-links a { position: relative; }
.nav-links a.active { color: var(--accent); }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 2px; background: var(--accent); border-radius: 2px;
}

/* Mobile nav overlay */
.nav-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.3); z-index: 40;
  opacity: 0; pointer-events: none; transition: opacity 0.3s ease;
}
.nav-overlay.open { opacity: 1; pointer-events: auto; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-visual { animation: none; }
  .hero-visual::before, .hero-visual::after { animation: none; }
  .card, .gallery-item, .gallery-item img { transition: none; }
  .lightbox, .lightbox-content { transition: none; }
}

@media (max-width: 920px) {
  .hero-grid, .split, .grid-2, .footer-grid, .gallery-grid { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: 1fr; }
  .nav { align-items: center; padding: .9rem 0; }
  .nav-toggle {
    display: inline-flex; border: 1px solid var(--line); background: #fff; border-radius: 12px; padding: .6rem .8rem; font-weight: 700;
    z-index: 60;
  }
  .nav-links {
    position: fixed; top: 0; right: 0; width: 280px; height: 100vh; background: #fff;
    box-shadow: -8px 0 30px rgba(0,0,0,0.1); transform: translateX(100%); transition: transform 0.3s ease;
    flex-direction: column; align-items: flex-start; padding: 5rem 1.5rem 2rem;
    z-index: 50; display: flex;
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links a { font-size: 1.1rem; padding: 0.75rem 0; }
  .nav-links a.active::after { bottom: 0; }
  .scroll-nav { display: none; }
}
@media (max-width: 640px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .section { padding: 3rem 0; }
  h1 { font-size: clamp(1.8rem, 4vw, 4.4rem); }
  .hero { padding: 3.5rem 0 2.5rem; }
}