/* Congreso Nacional USAR Cancún 2026 */

:root {
  --tinta: #0f1b33;      /* azul noche del póster: textos fuertes y bandas oscuras */
  --texto: #2b3445;
  --suave: #667085;
  --linea: #e4e7ec;
  --fondo: #ffffff;
  --gris: #f5f6f8;
  --rojo: #d6121b;       /* solo para detalles y llamados a la acción */
  --rojo-osc: #a80e15;
  --titulos: "Barlow Condensed", "Arial Narrow", sans-serif;
  --radio: 10px;
  --nav-h: 68px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 12px); }
body { margin: 0; font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; font-size: 16px; line-height: 1.6; color: var(--texto); background: var(--fondo); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--tinta); }
h1, h2, h3, h4 { color: var(--tinta); margin: 0 0 .5em; line-height: 1.15; }
h2 { font-family: var(--titulos); font-weight: 800; text-transform: uppercase; font-size: clamp(1.9rem, 4vw, 2.7rem); letter-spacing: .01em; }
h3 { font-size: 1.05rem; font-weight: 700; }
p { margin: 0 0 1em; }
.muted { color: var(--suave); }
.req { color: var(--rojo); }

.wrap { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 20px; }
.angosto { max-width: 860px; }
.sec { padding: 88px 0; }
.sec-corta { padding: 56px 0; }
.sec-gris { background: var(--gris); }
.sec-tinta { background: var(--tinta); color: #c9d1e0; }
.sec-tinta h2, .sec-tinta h3 { color: #fff; }
@media (max-width: 700px) { .sec { padding: 64px 0; } }

.kicker { display: flex; align-items: center; gap: .6rem; font-size: .78rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--rojo); margin-bottom: .8rem; }
.kicker::before { content: ""; width: 28px; height: 3px; background: var(--rojo); border-radius: 2px; }
.kicker.centro, .cabeza .kicker { justify-content: center; }
.cabeza { text-align: center; max-width: 680px; margin: 0 auto 48px; }
.sec-tinta .kicker { color: #ff5a5f; }
.sec-tinta .kicker::before { background: #ff5a5f; }

.dos-col { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
@media (max-width: 900px) { .dos-col { grid-template-columns: 1fr; gap: 40px; } }

/* Botones */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; font: inherit; font-weight: 700; font-size: .98rem; text-decoration: none; padding: .85rem 1.6rem; border-radius: 999px; border: 2px solid transparent; cursor: pointer; transition: background .15s, color .15s, border-color .15s; }
.btn-rojo { background: var(--rojo); color: #fff; }
.btn-rojo:hover, .btn-rojo:focus-visible { background: var(--rojo-osc); }
.btn-linea { border-color: var(--tinta); color: var(--tinta); background: transparent; }
.btn-linea:hover { background: var(--tinta); color: #fff; }
.btn-sm { padding: .5rem 1.1rem; font-size: .88rem; }
.btn-bloque { width: 100%; }
.btn:disabled { opacity: .6; cursor: wait; }
:focus-visible { outline: 3px solid rgba(214, 18, 27, .35); outline-offset: 2px; }

/* Navegación */
.nav { position: sticky; top: 0; z-index: 50; background: rgba(255, 255, 255, .92); backdrop-filter: saturate(160%) blur(10px); border-bottom: 1px solid transparent; transition: border-color .2s; }
.nav.con-borde { border-bottom-color: var(--linea); }
.nav-in { height: var(--nav-h); display: flex; align-items: center; justify-content: space-between; }
.marca { display: inline-flex; align-items: baseline; gap: .35rem; text-decoration: none; font-family: var(--titulos); line-height: 1; }
.marca-usar { font-weight: 800; font-size: 1.7rem; color: var(--tinta); letter-spacing: .02em; }
.marca-anio { font-weight: 700; font-size: 1rem; color: var(--rojo); letter-spacing: .1em; }
.menu { display: flex; align-items: center; gap: 1.6rem; }
.menu a:not(.btn) { text-decoration: none; font-size: .92rem; font-weight: 500; color: var(--texto); position: relative; }
.menu a:not(.btn)::after { content: ""; position: absolute; left: 0; right: 0; bottom: -6px; height: 2px; background: var(--rojo); transform: scaleX(0); transition: transform .2s; }
.menu a:not(.btn):hover::after { transform: scaleX(1); }
.nav-toggle { display: none; background: none; border: 0; padding: 10px; cursor: pointer; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--tinta); margin: 5px 0; transition: transform .2s, opacity .2s; }
@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .menu { position: absolute; top: var(--nav-h); left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; background: #fff; border-bottom: 1px solid var(--linea); padding: 8px 20px 20px; display: none; }
  .menu.abierto { display: flex; }
  .menu a:not(.btn) { padding: .8rem 0; border-bottom: 1px solid var(--linea); }
  .menu a:not(.btn)::after { display: none; }
  .menu .btn { margin-top: 1rem; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* Portada */
.hero { padding: 56px 0 88px; background: linear-gradient(180deg, #fff 0%, var(--gris) 100%); }
.hero-in { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
@media (max-width: 900px) { .hero-in { grid-template-columns: 1fr; gap: 40px; } .hero { padding: 32px 0 64px; } }
.etiquetas { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.4rem; }
.tag { font-size: .72rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; padding: .4rem .8rem; border-radius: 999px; background: #e6e9ef; color: var(--tinta); }
.tag-rojo { background: var(--rojo); color: #fff; }
.hero h1 { font-family: var(--titulos); text-transform: uppercase; font-weight: 800; line-height: .92; margin-bottom: 1.4rem; }
.h1-a, .h1-c { display: block; font-size: clamp(2rem, 4.6vw, 3.2rem); }
.h1-b { display: block; font-size: clamp(5rem, 13vw, 9rem); letter-spacing: -.01em; line-height: .88; }
.h1-c em { font-style: normal; color: var(--rojo); }
.datos { list-style: none; padding: 0; margin: 0 0 1.6rem; font-size: 1.05rem; }
.datos li { padding: .35rem 0 .35rem 1.1rem; position: relative; }
.datos li::before { content: ""; position: absolute; left: 0; top: 50%; width: 6px; height: 6px; margin-top: -3px; border-radius: 50%; background: var(--rojo); }
.datos strong { color: var(--tinta); }
.cuenta { display: flex; gap: .6rem; margin-bottom: 1.8rem; }
.cuenta div { min-width: 78px; text-align: center; padding: .7rem .5rem; border-radius: var(--radio); background: var(--tinta); color: #fff; }
.cuenta b { display: block; font-family: var(--titulos); font-size: 2rem; line-height: 1; font-weight: 700; }
.cuenta span { font-size: .66rem; text-transform: uppercase; letter-spacing: .12em; color: #a9b3c7; }
.acciones { display: flex; flex-wrap: wrap; gap: .8rem; }
.hero-img img { width: 100%; max-width: 540px; margin-left: auto; border-radius: 14px; box-shadow: 0 30px 70px rgba(15, 27, 51, .22); }
@media (max-width: 900px) { .hero-img img { margin: 0 auto; } }

/* Cifras */
.cifras { background: var(--tinta); color: #fff; border-bottom: 4px solid var(--rojo); }
.cifras-in { display: grid; grid-template-columns: repeat(5, 1fr); text-align: center; padding-top: 28px; padding-bottom: 28px; }
.cifras b { display: block; font-family: var(--titulos); font-size: 2.6rem; line-height: 1; font-weight: 800; }
.cifras span { font-size: .74rem; letter-spacing: .12em; text-transform: uppercase; color: #a9b3c7; }
@media (max-width: 700px) { .cifras-in { grid-template-columns: repeat(3, 1fr); row-gap: 20px; } }

/* Pilares */
.pilares { list-style: none; counter-reset: p; margin: 0; padding: 0; }
.pilares li { counter-increment: p; position: relative; padding: 1.3rem 0 1.3rem 3.4rem; border-bottom: 1px solid var(--linea); }
.pilares li:first-child { padding-top: 0; }
.pilares li:first-child::before { top: 0; }
.pilares li::before { content: "0" counter(p); position: absolute; left: 0; top: 1.3rem; font-family: var(--titulos); font-weight: 800; font-size: 1.5rem; color: var(--rojo); line-height: 1; }
.pilares p { margin: 0; color: var(--suave); }

/* Rejilla de tarjetas */
.rejilla { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 960px) { .rejilla { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .rejilla { grid-template-columns: 1fr; } }

.eje { background: #fff; border: 1px solid var(--linea); border-radius: var(--radio); padding: 1.6rem; transition: border-color .2s, transform .2s; }
.eje:hover { border-color: var(--rojo); transform: translateY(-2px); }
.eje .num { display: block; font-family: var(--titulos); font-weight: 800; font-size: 1.1rem; color: var(--rojo); letter-spacing: .08em; margin-bottom: .6rem; }
.eje p { margin: 0; color: var(--suave); font-size: .93rem; }

.ponente { position: relative; border: 1px solid var(--linea); border-radius: var(--radio); padding: 1.5rem; background: #fff; }
.ponente .ini { width: 56px; height: 56px; border-radius: 50%; display: grid; place-items: center; background: var(--tinta); color: #fff; font-family: var(--titulos); font-weight: 700; font-size: 1.3rem; letter-spacing: .04em; margin-bottom: 1rem; box-shadow: 0 0 0 3px #fff, 0 0 0 5px var(--rojo); }
.ponente h3 { margin-bottom: .2rem; }
.ponente .cargo { color: var(--suave); font-size: .87rem; margin-bottom: .9rem; }
.ponente .charla { margin: 0; font-size: .93rem; color: var(--tinta); border-left: 3px solid var(--rojo); padding-left: .75rem; }
.estatus { display: none; position: absolute; top: 1rem; right: 1rem; font-size: .64rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; padding: .28rem .6rem; border-radius: 999px; background: #fff4d6; color: #8a6100; }
body.validacion .estatus { display: inline-block; }

/* Programa */
.tabs { display: flex; justify-content: center; gap: .5rem; margin-bottom: 28px; }
.tabs button { font: inherit; font-weight: 700; padding: .65rem 1.5rem; border-radius: 999px; border: 2px solid var(--linea); background: #fff; color: var(--texto); cursor: pointer; }
.tabs button[aria-selected="true"] { background: var(--tinta); border-color: var(--tinta); color: #fff; }
.lema { text-align: center; font-style: italic; color: var(--suave); margin-bottom: 24px; }
.b { display: grid; grid-template-columns: 120px 1fr; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--linea); }
.b time { font-weight: 700; font-size: .9rem; color: var(--rojo); font-variant-numeric: tabular-nums; padding-top: 2px; }
.b h4 { font-size: 1.02rem; margin-bottom: .25rem; }
.b p { margin: 0; color: var(--suave); font-size: .93rem; }
.b .quien { font-size: .76rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--tinta); margin-bottom: .25rem; }
.b.pausa h4 { color: var(--suave); font-weight: 500; }
.b.pausa time { color: var(--suave); }
.b.top { background: #fff; border: 1px solid var(--linea); border-left: 4px solid var(--rojo); border-radius: var(--radio); padding: 18px; margin: 10px 0; }
@media (max-width: 560px) { .b { grid-template-columns: 1fr; gap: 4px; } }

/* Challenge */
.mini { font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; margin: 1.8rem 0 .9rem; }
.dos-col > div > .mini:first-child { margin-top: 0; }
.lista { margin: 0; padding-left: 1.1rem; color: #fff; }
.lista li { padding: .2rem 0; }
.lista li::marker { color: #ff5a5f; }
.chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.chips span { font-size: .85rem; padding: .35rem .85rem; border-radius: 999px; border: 1px solid rgba(255, 255, 255, .28); color: #fff; }
.chips-claro span { border-color: var(--linea); color: var(--texto); background: #fff; }
.mision { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .4rem; counter-reset: m; }
.mision li { counter-increment: m; font-size: .85rem; font-weight: 600; color: var(--tinta); background: #fff; padding: .35rem .75rem; border-radius: 6px; }
.mision li::before { content: counter(m) " "; color: var(--rojo); font-weight: 800; }

/* Instituciones */
.inst { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: .6rem; }
.inst li { background: #fff; border: 1px solid var(--linea); border-radius: 999px; padding: .5rem 1.1rem; font-size: .9rem; font-weight: 500; color: var(--tinta); }

/* Expo */
.expo-in { display: grid; grid-template-columns: 1fr auto; gap: 48px; align-items: center; }
.expo-in p { margin: 0; max-width: 640px; }
.expo-cta { display: flex; flex-direction: column; align-items: center; gap: .7rem; }
.link-claro { color: #c9d1e0; font-size: .88rem; }
@media (max-width: 800px) { .expo-in { grid-template-columns: 1fr; gap: 28px; } .expo-cta { align-items: flex-start; } }

/* FAQ */
.faq details { border-bottom: 1px solid var(--linea); }
.faq summary { list-style: none; cursor: pointer; padding: 1.15rem 2.2rem 1.15rem 0; font-weight: 600; color: var(--tinta); position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 0; top: 50%; transform: translateY(-50%); font-size: 1.5rem; font-weight: 400; color: var(--rojo); line-height: 1; transition: transform .2s; }
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq details p { color: var(--suave); padding-right: 2.2rem; }

/* Formulario */
.form { background: #fff; border: 1px solid var(--linea); border-top: 4px solid var(--rojo); border-radius: var(--radio); padding: 36px; box-shadow: 0 20px 50px rgba(15, 27, 51, .06); }
@media (max-width: 560px) { .form { padding: 24px 18px; } }
.form fieldset { border: 0; padding: 0; margin: 0 0 28px; }
.form legend { font-size: .76rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--rojo); padding: 0; margin-bottom: 18px; }
.campos { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 20px; }
@media (max-width: 620px) { .campos { grid-template-columns: 1fr; } }
.campos label { display: block; font-size: .9rem; font-weight: 600; color: var(--tinta); }
.campos label > input, .campos label > select, .campos label > textarea { display: block; margin-top: .4rem; }
.campos label.ancho { grid-column: 1 / -1; }
.campos small { display: block; margin-top: .4rem; font-weight: 400; font-size: .8rem; color: var(--suave); }
.form input[type="text"], .form input[type="email"], .form input[type="tel"], .form select, .form textarea { font: inherit; font-weight: 400; font-size: .98rem; color: var(--texto); width: 100%; padding: .72rem .9rem; border: 1px solid #cfd4dc; border-radius: 8px; background: #fff; transition: border-color .15s, box-shadow .15s; }
.form select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%23667085' stroke-width='2'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right .9rem center; padding-right: 2.4rem; }
.form input:focus, .form select:focus, .form textarea:focus { outline: none; border-color: var(--rojo); box-shadow: 0 0 0 3px rgba(214, 18, 27, .12); }
.form.validado :invalid { border-color: var(--rojo); }
.check { display: flex; gap: .7rem; align-items: flex-start; font-size: .9rem; color: var(--texto); margin-bottom: 24px; cursor: pointer; }
.check input { width: 18px; height: 18px; margin-top: 3px; accent-color: var(--rojo); flex: none; }
.form.validado .check input:invalid + span { color: var(--rojo); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.aviso { margin-top: 18px; padding: 1rem 1.2rem; border-radius: 8px; font-size: .95rem; }
.aviso.ok { background: #ecfdf3; color: #05603a; border: 1px solid #abefc6; }
.aviso.espera { background: #fffaeb; color: #93370d; border: 1px solid #fedf89; }
.aviso.error { background: #fef3f2; color: #b42318; border: 1px solid #fecdca; }
.aviso .folio { display: block; font-family: var(--titulos); font-size: 2rem; font-weight: 800; letter-spacing: .06em; color: var(--tinta); margin: .1rem 0 .4rem; }
.aviso .folio-l { font-size: .72rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }

/* Pie */
.pie { background: var(--tinta); color: #a9b3c7; padding: 44px 0; font-size: .9rem; border-top: 4px solid var(--rojo); }
.pie-in { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.pie p { margin: 0 0 .4rem; }
.pie a { color: #fff; }
.marca-pie .marca-usar { color: #fff; }
.pie-legal { font-size: .8rem; }