/* ============================================================================
   landing.css — página pública de Te-Facturo.
   Los colores salen SIEMPRE de /css/theme.css con var(). Aquí no hay :root
   con colores (regla de la hoja única de tema). Tipografía: --font-doc para
   titulares y cifras, --font-ui para texto, --font-mono solo para folios,
   UUID, código y datos de máquina.
   ============================================================================ */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-ui);
    font-size: 1rem;
    line-height: 1.6;
    -webkit-text-size-adjust: 100%;
}
h1, h2, h3, p, ul, ol, dl, dd, figure, pre { margin: 0; }
a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { color: var(--accent-hover); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

.mono { font-family: var(--font-mono); font-size: 0.86em; }
.chico { font-size: 0.82rem; color: var(--muted); }
.cifra { font-family: var(--font-doc); font-variant-numeric: lining-nums tabular-nums; }
.solo-lector {
    position: absolute; width: 1px; height: 1px; overflow: hidden;
    clip: rect(0 0 0 0); white-space: nowrap;
}
.saltar {
    position: absolute; left: 0.5rem; top: -4rem; z-index: 30;
    background: var(--accent); color: var(--on-accent);
    padding: 0.5rem 0.9rem; border-radius: 4px; text-decoration: none;
}
.saltar:focus { top: 0.5rem; }

.envoltura { width: 100%; max-width: 72rem; margin: 0 auto; padding-left: 1.25rem; padding-right: 1.25rem; }

/* ---- Botones ---- */
.btn {
    display: inline-block;
    padding: 0.5rem 0.95rem;
    border: 1px solid transparent;
    border-radius: 4px;
    font: inherit; font-size: 0.92rem; font-weight: 600; line-height: 1.3;
    text-decoration: none; cursor: pointer;
}
.btn--primario { background: var(--accent); color: var(--on-accent); }
.btn--primario:hover { background: var(--accent-hover); color: var(--on-accent); }
.btn--tenue { background: transparent; color: var(--text); border-color: var(--border); }
.btn--tenue:hover { background: var(--bg-row); color: var(--text); }
.btn--grande { padding: 0.75rem 1.2rem; font-size: 1rem; }
.btn--chico { padding: 0.25rem 0.65rem; font-size: 0.8rem; font-weight: 500; }

/* ---- Cabecera pegada ---- */
.cab {
    position: sticky; top: 0; z-index: 20;
    background: var(--nav-bg);
    -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}
.cab__fila { display: flex; align-items: center; gap: 1.5rem; padding-top: 0.7rem; padding-bottom: 0.7rem; }
.marca {
    font-family: var(--font-doc); font-weight: 700; font-size: 1.3rem;
    color: var(--text); text-decoration: none; letter-spacing: -0.01em;
}
.marca:hover { color: var(--text); }
.cab__nav { display: flex; gap: 1.25rem; margin-right: auto; }
.cab__nav a { color: var(--muted); font-size: 0.9rem; text-decoration: none; }
.cab__nav a:hover { color: var(--text); text-decoration: underline; }
.cab__acceso { display: flex; gap: 0.5rem; margin-left: auto; }
.cab__nav + .cab__acceso { margin-left: 0; }

/* ---- Apertura ---- */
.apertura {
    display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 3rem; align-items: start;
    padding-top: 3.5rem; padding-bottom: 4rem;
}
.titular {
    font-family: var(--font-doc); font-weight: 600;
    font-size: clamp(2.1rem, 4.6vw, 3.3rem); line-height: 1.08; letter-spacing: -0.015em;
    max-width: 15ch;
}
.entrada { margin-top: 1.4rem; font-size: 1.1rem; max-width: 34em; color: var(--text); }
.apertura__acciones { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.75rem; }
.nota { margin-top: 1rem; max-width: 36em; font-size: 0.88rem; color: var(--muted); }

/* ---- El libro: una emisión paso por paso ---- */
.libro {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-left: 3px solid var(--stamp);
    border-radius: 2px 6px 6px 2px;
    box-shadow: var(--shadow);
    padding: 1rem 1.25rem 1.25rem;
    position: relative;
    overflow: hidden;
}
.libro__cab {
    display: flex; justify-content: space-between; align-items: center; gap: 0.75rem;
    padding-bottom: 0.75rem; border-bottom: 1px solid var(--border);
    font-family: var(--font-doc); font-size: 1.05rem; font-weight: 600;
}
.libro__aviso { font-family: var(--font-ui); font-weight: 400; font-size: 0.8rem; color: var(--muted); }
.libro__datos { display: grid; gap: 0.35rem; padding: 0.9rem 0; border-bottom: 1px solid var(--border); }
.libro__datos > div { display: grid; grid-template-columns: 5.5rem 1fr; gap: 0.75rem; font-size: 0.9rem; }
.libro__datos dt { color: var(--muted); }
.libro__datos dd { margin: 0; }
.libro__datos .cifra { font-size: 1.15rem; font-weight: 600; }
.libro__datos .cifra .chico { font-family: var(--font-ui); font-weight: 400; }

.pasos { list-style: none; margin: 0; padding: 0.4rem 0 0; }
.paso {
    display: grid; grid-template-columns: 1.5rem minmax(0, 1fr) minmax(0, 1.15fr);
    gap: 0.6rem; align-items: center;
    padding: 0.5rem 0; border-bottom: 1px dotted var(--border);
    font-size: 0.92rem;
}
.paso__marca {
    width: 1.05rem; height: 1.05rem; border-radius: 50%;
    border: 2px solid var(--success); background: var(--success); position: relative;
}
.paso__marca::after {
    content: ""; position: absolute; left: 0.28rem; top: 0.06rem;
    width: 0.28rem; height: 0.54rem;
    border: solid var(--bg-card); border-width: 0 2px 2px 0; transform: rotate(40deg);
}
.paso__nombre { font-weight: 500; }
.paso__res { color: var(--muted); text-align: right; font-size: 0.8rem; }
.paso[data-e="espera"] .paso__marca { background: transparent; border-color: var(--border); }
.paso[data-e="espera"] .paso__marca::after { display: none; }
.paso[data-e="espera"] .paso__nombre { color: var(--muted); }
.paso[data-e="espera"] .paso__res { opacity: 0; }
.paso[data-e="corre"] .paso__marca {
    background: transparent; border-color: var(--border); border-top-color: var(--accent);
    animation: giro 0.7s linear infinite;
}
.paso[data-e="corre"] .paso__marca::after { display: none; }
.paso[data-e="corre"] .paso__res { opacity: 0; }
.paso__res { transition: opacity 0.25s; }
@keyframes giro { to { transform: rotate(360deg); } }

.libro__pie {
    display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 0.75rem 1rem; align-items: end;
    padding-top: 1rem; position: relative; min-height: 5.5rem;
}
.libro__uuid { display: grid; gap: 0.15rem; overflow-wrap: anywhere; }
.libro__uuid .mono { font-size: 0.8rem; }
.libro__saldo { display: grid; justify-items: end; gap: 0.1rem; }
.libro__saldo .cifra { font-size: 1.9rem; font-weight: 600; line-height: 1; }
.libro__saldo .cifra.baja { color: var(--stamp); }
.sello {
    position: absolute; right: 5.5rem; bottom: 0.4rem;
    border: 3px double var(--stamp); border-radius: 4px;
    color: var(--stamp); font-family: var(--font-doc); font-weight: 700;
    font-size: 1.35rem; letter-spacing: 0.12em; text-transform: uppercase;
    padding: 0.15rem 0.7rem; transform: rotate(-8deg);
    background: var(--bg-card);
    transition: opacity 0.12s, transform 0.18s cubic-bezier(0.2, 1.6, 0.4, 1);
}
/* Estados del libro mientras JS lo reproduce */
.js-on .libro:not(.es-final) .sello { opacity: 0; transform: rotate(-8deg) scale(1.8); }
.js-on .libro:not(.es-final) .libro__uuid { opacity: 0; }
.libro__uuid { transition: opacity 0.3s; }

/* ---- Bandas de contenido ---- */
.banda {
    display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 2.5rem;
    padding-top: 3.25rem; padding-bottom: 3.25rem;
    border-top: 1px solid var(--border);
}
.banda__tit { align-self: start; position: sticky; top: 5rem; }
.banda__tit h2 {
    font-family: var(--font-doc); font-weight: 600;
    font-size: clamp(1.45rem, 2.4vw, 1.9rem); line-height: 1.2; letter-spacing: -0.01em;
    max-width: 18ch;
}
.banda__tit p { margin-top: 0.8rem; color: var(--muted); max-width: 30em; font-size: 0.95rem; }
.banda__cuerpo { min-width: 0; display: grid; gap: 1.75rem; align-content: start; }
.banda__cuerpo--dos { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 2rem; }

.parrafos { display: grid; gap: 0.7rem; max-width: 40em; align-content: start; }
.paquetes { list-style: none; display: grid; gap: 0.4rem; max-width: 32em; }
.paquetes li { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 0.2rem 1rem; padding: 0.5rem 0.8rem; background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; }
.paquetes__precio { font-family: var(--font-doc); font-weight: 600; }
.paquetes__unidad { color: var(--muted); font-size: 0.88rem; }
.parrafos--ancho { max-width: 46em; }
.parrafos h3 { font-family: var(--font-doc); font-size: 1.05rem; font-weight: 600; margin-top: 0.6rem; }
.parrafos h3:first-child { margin-top: 0; }
.aparte {
    max-width: 40em; font-size: 0.92rem; color: var(--muted);
    border-left: 2px solid var(--border); padding-left: 0.9rem;
}
.lista { margin: 0; padding-left: 1.15rem; display: grid; gap: 0.5rem; max-width: 42em; }
.lista li::marker { color: var(--stamp); }
.lista--limites { max-width: 46em; }

/* Enlaces dentro del contenido: texto normal subrayado (el azul sobre el fondo claro no llega a AA). */
.banda a { color: var(--text); text-decoration-color: var(--accent); text-decoration-thickness: 2px; }
.banda a:hover { color: var(--accent-hover); }

/* ---- Tablas ---- */
.tabla { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.tabla th, .tabla td { text-align: left; vertical-align: top; padding: 0.7rem 0.8rem 0.7rem 0; border-bottom: 1px solid var(--border); }
.tabla thead th { font-weight: 600; color: var(--muted); font-size: 0.82rem; border-bottom: 2px solid var(--text); }
.tabla tbody th { font-family: var(--font-doc); font-weight: 600; font-size: 1rem; }
.tabla td { color: var(--text); }
.tabla tbody tr:hover { background: var(--bg-row); }

/* ---- Chat de Mercado Libre ---- */
.chat {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px;
    padding: 0.9rem; display: grid; gap: 0.6rem; align-content: start; align-self: start;
}
.chat__cab { font-family: var(--font-doc); font-weight: 600; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border); }
.msg { max-width: 88%; padding: 0.5rem 0.75rem; border-radius: 8px; font-size: 0.9rem; transition: opacity 0.3s, transform 0.3s; }
.msg p + p { margin-top: 0.3rem; }
.msg__de { display: block; font-size: 0.72rem; color: var(--muted); margin-bottom: 0.15rem; }
.msg--comprador { background: var(--bg-row); border: 1px solid var(--border); justify-self: start; border-bottom-left-radius: 2px; }
.msg--sistema { background: var(--bg); border: 1px solid var(--accent); justify-self: end; border-bottom-right-radius: 2px; }
.adjunto {
    display: inline-block; font-family: var(--font-mono); font-size: 0.78rem;
    border: 1px dashed var(--muted); border-radius: 3px; padding: 0.1rem 0.45rem;
}
.evento { display: flex; align-items: center; gap: 0.6rem; font-size: 0.78rem; color: var(--muted); transition: opacity 0.3s; }
.evento::before, .evento::after { content: ""; flex: 1; border-top: 1px solid var(--border); }
.evento span { max-width: 80%; text-align: center; }
.js-on .chat .oculto { opacity: 0; transform: translateY(4px); }

/* ---- Mock de ARIA ---- */
.aria {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px;
    padding: 1rem; display: grid; gap: 0.6rem; align-content: start; align-self: start;
}
.aria__pregunta { font-family: var(--font-doc); font-weight: 600; }
.aria__chips { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.chip {
    display: inline-block; font-size: 0.82rem; padding: 0.2rem 0.65rem;
    border: 1px solid var(--border); border-radius: 999px; background: var(--bg-row);
}
.chip--ya { border-color: var(--stamp); }
.chip--ok { background: var(--accent); color: var(--on-accent); border-color: var(--accent); font-weight: 600; }
.aria__resumen { display: grid; gap: 0.15rem; padding: 0.6rem 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.aria__resumen > div { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.9rem; }
.aria__resumen dt { color: var(--muted); }
.aria__resumen dd { margin: 0; }

/* ---- Diagrama de aislamiento ---- */
.diagrama { max-width: 44rem; }
.diagrama svg { display: block; width: 100%; height: auto; font-family: var(--font-ui); }
.dg-cuenta { fill: none; stroke: var(--border); stroke-width: 1.5; }
.dg-emp { fill: var(--bg-card); stroke: var(--text); stroke-width: 1.25; }
.dg-emp--comp { stroke: var(--stamp); stroke-dasharray: 5 4; }
.dg-enlace { fill: none; stroke: var(--stamp); stroke-width: 1.5; stroke-dasharray: 5 4; }
.dg-rotulo { fill: var(--text); font-size: 17px; font-weight: 600; font-family: var(--font-doc); }
.dg-nombre { fill: var(--text); font-size: 16px; font-weight: 600; }
.dg-sub { fill: var(--muted); font-size: 13.5px; }

/* ---- Código ---- */
.codigo {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px;
    padding: 1rem 1.15rem; overflow-x: auto; max-width: 100%;
    font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.55; color: var(--text);
}
.codigo .c { color: var(--muted); }
.codigo .k { color: var(--accent); font-weight: 700; }
.codigo .s { color: var(--text); font-style: italic; }

/* ---- Cierre y pie ---- */
.cierre { padding-top: 4rem; padding-bottom: 4.5rem; border-top: 1px solid var(--border); }
.cierre h2 { font-family: var(--font-doc); font-weight: 600; font-size: clamp(1.6rem, 3vw, 2.2rem); line-height: 1.15; max-width: 22ch; }
.cierre p { margin-top: 0.7rem; color: var(--muted); }
.pie { border-top: 1px solid var(--border); background: var(--bg-card); padding: 2rem 0; }
.pie__fila { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1.5rem; }
.pie__marca { font-family: var(--font-doc); font-weight: 700; font-size: 1.15rem; }
.pie__nota { max-width: 28em; margin-bottom: 0.4rem; }
.pie__lista { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.25rem; font-size: 0.9rem; }

/* ---- Pantallas angostas ---- */
@media (max-width: 62rem) {
    .apertura { grid-template-columns: minmax(0, 1fr); gap: 2.25rem; padding-top: 2.25rem; }
    .titular { max-width: 20ch; }
    .banda { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
    .banda__tit { position: static; }
    .banda__cuerpo--dos { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 52rem) {
    .cab__nav { display: none; }
    .cab__acceso { margin-left: auto; }
}
@media (max-width: 44rem) {
    .tabla thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
    .tabla, .tabla tbody, .tabla tr, .tabla th, .tabla td { display: block; width: 100%; }
    .tabla tr { padding: 0.7rem 0; border-bottom: 1px solid var(--border); }
    .tabla th, .tabla td { border: 0; padding: 0.15rem 0; }
    .tabla td[data-et]::before { content: attr(data-et) ": "; color: var(--muted); font-size: 0.82rem; }
}
@media (max-width: 30rem) {
    .envoltura { padding-left: 1rem; padding-right: 1rem; }
    .cab__fila { gap: 0.5rem; }
    .cab__acceso .btn--tenue { display: none; }
    .btn--grande { width: 100%; text-align: center; }
    .paso { grid-template-columns: 1.5rem minmax(0, 1fr); }
    .paso__res { grid-column: 2; text-align: left; }
    .libro__datos > div { grid-template-columns: 1fr; gap: 0; }
    .sello { right: 4.2rem; font-size: 1.05rem; }
    .msg { max-width: 96%; }
}

/* ---- Sin animación: el estado final siempre visible ---- */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .paso[data-e="corre"] .paso__marca { animation: none; }
    .sello, .msg, .evento, .paso__res, .libro__uuid { transition: none; }
}