/* ==========================================================================
   PLB · base.css
   Fundamentos: tipografías, colores de marca, reset, tipografía, botones,
   formularios y sistema de aparición. Se carga en todas las páginas.
   Orden de los tres CSS: base.css → layout.css → sections.css
   ========================================================================== */

/* ---------- 1. Tipografías (autohospedadas, sin terceros) ---------- */
@font-face {
  font-family: "Source Serif 4";
  src: url("../assets/fonts/source-serif-4.woff2") format("woff2");
  font-weight: 200 900; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Montserrat";
  src: url("../assets/fonts/montserrat.woff2") format("woff2");
  font-weight: 100 900; font-style: normal; font-display: swap;
}

/* ---------- 2. Tokens ---------- */
:root {
  /* Marca (docs/marca.md): no se alteran */
  --amarillo: #F4DB00;
  --naranja:  #FB6107;
  --verde:    #5C8001;
  /* Neutros */
  --tinta:       #231F20;   /* negro del isotipo */
  --noche:       #141112;
  --tinta-suave: #4B4547;
  --apagado:     #6A6466;
  --papel:       #F7F4EA;
  --papel-2:     #EDE8D8;
  --blanco:      #FFFFFF;
  /* Derivados (para cumplir contraste AA en texto) */
  --amarillo-suave: #FBF1A0;
  --amarillo-hover: #E0C800;
  --naranja-prof:   #B04405;   /* texto/enlaces naranjas sobre fondos claros */
  --verde-prof:     #4E6D01;   /* texto verde sobre fondos claros */
  --linea: rgba(35, 31, 32, .16);
  --linea-clara: rgba(247, 244, 234, .2);

  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans:  "Montserrat", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;

  --ease:        cubic-bezier(.2, .75, .1, 1);
  --ease-inout:  cubic-bezier(.7, 0, .2, 1);

  --gutter: clamp(20px, 5vw, 64px);
  --maxw: 1280px;
  --header-h: 72px;
  --radio: 14px;
}

/* ---------- 3. Reset y base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;           /* scroll nativo: sin librerías */
  overflow-x: clip;
  scroll-padding-top: calc(var(--header-h) + 16px);
}
body {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.0625rem, .3vw + 1rem, 1.1875rem);
  line-height: 1.65;
  color: var(--tinta);
  background: var(--papel);
  overflow-x: clip;                  /* clip (no hidden) para no romper position: sticky */
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
::selection { background: var(--amarillo); color: var(--tinta); }

:focus-visible {
  outline: 3px solid var(--tinta);
  outline-offset: 3px;
  border-radius: 4px;
}
.on-dark :focus-visible, .section--noche :focus-visible, .section--tinta :focus-visible { outline-color: var(--amarillo); }

.skip {
  position: fixed; left: 12px; top: -80px; z-index: 300;
  background: var(--amarillo); color: var(--tinta);
  font: 700 .85rem/1 var(--sans); padding: 14px 18px; border-radius: 8px;
  transition: top .2s;
}
.skip:focus { top: 12px; }
.sr-only {
  position: absolute !important; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------- 4. Tipografía ---------- */
h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.04;
  letter-spacing: -.02em;
  text-wrap: balance;
}
.h-display { font-size: clamp(2.45rem, 1.1rem + 6.4vw, 6.6rem); line-height: .98; letter-spacing: -.03em; }
h2, .h2    { font-size: clamp(2rem, 1.1rem + 3.5vw, 4.1rem); }
h3, .h3    { font-size: clamp(1.4rem, 1rem + 1.4vw, 2.05rem); line-height: 1.12; }
h4, .h4    { font-size: 1.2rem; line-height: 1.2; }

.lede { font-size: clamp(1.15rem, .9rem + .9vw, 1.5rem); line-height: 1.5; color: var(--tinta-suave); max-width: 38em; }
.section--noche .lede, .section--tinta .lede, .on-dark .lede { color: rgba(247, 244, 234, .82); }
.prose p, .lede { text-wrap: pretty; }
.prose > * + * { margin-top: 1.1em; }
.prose { max-width: 40em; }
em { font-style: normal; }          /* sin cursiva sintetizada: el énfasis va con color/marcador */

.kicker {
  display: inline-flex; align-items: center; gap: .9em;
  font: 700 .72rem/1.2 var(--sans);
  letter-spacing: .22em; text-transform: uppercase;
  color: var(--naranja-prof);
}
.kicker::before { content: ""; width: 2.4em; height: 2px; background: currentColor; }
.section--noche .kicker, .section--tinta .kicker, .on-dark .kicker { color: var(--naranja); }
.section--amarillo .kicker { color: var(--tinta); }

/* Marcador amarillo que se "pinta" al aparecer.
   El texto hereda el color de la sección hasta que el resaltado está pintado (así nunca queda tinta sobre fondo oscuro). */
.mark {
  color: inherit;
  background: linear-gradient(var(--amarillo), var(--amarillo)) no-repeat 0 92% / 0% 88%;
  padding: 0 .14em; margin: 0 -.04em;
  -webkit-box-decoration-break: clone; box-decoration-break: clone;
  transition: background-size 1s var(--ease) .35s, color .3s ease .75s;
}
.mark.is-in, .is-in .mark, .no-js .mark { background-size: 100% 88%; color: var(--tinta); }
.section--amarillo .mark { background-image: linear-gradient(var(--noche), var(--noche)); }
.section--amarillo .mark.is-in, .section--amarillo .is-in .mark, .no-js .section--amarillo .mark { color: var(--amarillo); }

/* Enlace con subrayado animado */
.link {
  text-decoration: none; font-family: var(--sans); font-weight: 700; font-size: .8rem;
  letter-spacing: .1em; text-transform: uppercase;
  display: inline-flex; align-items: center; gap: .7em;
  background: linear-gradient(currentColor, currentColor) no-repeat 0 100% / 100% 2px;
  padding-bottom: .45em; transition: background-size .45s var(--ease);
}
.link:hover { background-size: 0% 2px; background-position: 100% 100%; }
.link svg { width: 1.2em; height: 1.2em; transition: transform .4s var(--ease); }
.link:hover svg { transform: translateX(6px); }
.prose a:not(.btn):not(.link) {
  color: var(--naranja-prof); text-underline-offset: .2em; text-decoration-thickness: 2px;
}
.section--noche .prose a:not(.btn) { color: var(--amarillo); }

/* ---------- 5. Botones ---------- */
.btn {
  --bg: var(--amarillo); --fg: var(--tinta); --bg-h: var(--tinta); --fg-h: var(--amarillo);
  position: relative; isolation: isolate; overflow: hidden;
  display: inline-flex; align-items: center; justify-content: center; gap: .8em;
  padding: 1.05em 1.7em; border: 2px solid var(--bg); border-radius: 999px;
  font: 700 .8rem/1 var(--sans); letter-spacing: .1em; text-transform: uppercase; text-decoration: none;
  background: var(--bg); color: var(--fg); cursor: pointer;
  transition: color .45s var(--ease), border-color .45s var(--ease), transform .45s var(--ease);
}
.btn::before {              /* relleno que sube desde abajo al pasar el cursor */
  content: ""; position: absolute; inset: -2px; z-index: -1;
  background: var(--bg-h); transform: translateY(101%); border-radius: inherit;
  transition: transform .55s var(--ease);
}
.btn:hover, .btn:focus-visible { color: var(--fg-h); border-color: var(--bg-h); }
.btn:hover::before, .btn:focus-visible::before { transform: none; }
.btn svg { width: 1.25em; height: 1.25em; flex: none; transition: transform .45s var(--ease); }
.btn:hover svg { transform: translateX(5px); }
.btn--tinta { --bg: var(--tinta); --fg: var(--papel); --bg-h: var(--amarillo); --fg-h: var(--tinta); }
.btn--linea { --bg: transparent; --fg: currentColor; --bg-h: var(--amarillo); --fg-h: var(--tinta); border-color: currentColor; }
.btn--linea:hover { border-color: var(--amarillo); }
.btn--sm { padding: .85em 1.35em; font-size: .72rem; }
.btn--lg { padding: 1.25em 2.1em; font-size: .88rem; }
.btn[disabled] { opacity: .6; pointer-events: none; }
.btn.is-sending svg { animation: giro 1s linear infinite; }
@keyframes giro { to { transform: rotate(360deg); } }

/* ---------- 6. Formularios ---------- */
.form { display: grid; gap: 1.15rem; }
.form__grid { display: grid; gap: 1.15rem; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.form__grid .full { grid-column: 1 / -1; }
.field { position: relative; display: grid; gap: .45rem; }
.field label {
  font: 700 .68rem/1.2 var(--sans); letter-spacing: .16em; text-transform: uppercase; color: var(--tinta-suave);
}
.field input[type="text"], .field input[type="email"], .field input[type="tel"] {
  width: 100%; padding: .95rem 1rem; border-radius: 10px;
  background: var(--blanco); border: 2px solid transparent; box-shadow: inset 0 0 0 1px var(--linea);
  font: 500 1rem/1.3 var(--sans); color: var(--tinta);
  transition: box-shadow .3s var(--ease), border-color .3s var(--ease), background .3s;
}
.field input::placeholder { color: #8a8486; }
.field input:hover { box-shadow: inset 0 0 0 1px var(--tinta-suave); }
.field input:focus { outline: none; border-color: var(--tinta); box-shadow: 0 6px 0 -2px var(--amarillo); }
.field.is-invalid input { border-color: var(--naranja-prof); box-shadow: none; }
.field__error { display: none; font: 600 .78rem/1.35 var(--sans); color: var(--naranja-prof); }
.field.is-invalid .field__error { display: block; }
.check { display: grid; grid-template-columns: auto 1fr; gap: .8rem; align-items: start; font: 500 .85rem/1.5 var(--sans); }
.check input { width: 1.35rem; height: 1.35rem; margin: .1rem 0 0; accent-color: var(--tinta); }
.check a { color: inherit; text-underline-offset: .2em; }
.check .field__error { grid-column: 2; }
.check.is-invalid { color: var(--naranja-prof); }
.check.is-invalid .field__error { display: block; }
.hp { position: absolute !important; left: -9999px; width: 1px; height: 1px; overflow: hidden; }   /* campo trampa anti-spam */
.form__status { font: 600 .92rem/1.5 var(--sans); }
.form__status:empty { display: none; }
.form-msg {
  border-radius: var(--radio); padding: 1.4rem 1.5rem; font-family: var(--sans);
  animation: entra .6s var(--ease) both;
}
.form-msg h3 { font-family: var(--serif); margin-bottom: .4em; }
.form-msg p { font-size: .95rem; line-height: 1.55; }
.form-msg--ok { background: var(--verde); color: var(--blanco); }        /* blanco sobre verde: 4,6:1 */
.form-msg--ok h3 { color: var(--blanco); }
.form-msg--error { background: var(--tinta); color: var(--papel); border-left: 6px solid var(--naranja); }
.form-msg .btn { margin-top: 1rem; }
@keyframes entra { from { opacity: 0; transform: translateY(14px); } }

/* ---------- 7. Sistema de aparición (contenido visible sin JS) ---------- */
.js [data-reveal] {
  opacity: 0; transform: translate3d(0, 32px, 0);
  transition: opacity .9s var(--ease), transform .9s var(--ease);
  transition-delay: var(--d, 0s);
}
.js [data-reveal="izq"]   { transform: translate3d(-48px, 0, 0); }
.js [data-reveal="der"]   { transform: translate3d(48px, 0, 0); }
.js [data-reveal="zoom"]  { transform: scale(.93); }
.js [data-reveal="telon"] { opacity: 1; transform: none; clip-path: inset(0 0 100% 0); transition: clip-path 1.2s var(--ease-inout) var(--d, 0s); }
.js [data-reveal].is-in   { opacity: 1; transform: none; }
.js [data-reveal="telon"].is-in { clip-path: inset(0 0 0 0); }
/* Defensa (gotcha A.4.5): un título dividido nunca queda invisible */
.reveal[data-split], [data-reveal][data-split] { opacity: 1; transform: none; }

/* Titulares divididos por palabras (máscara que sube). El HTML ya viene dividido; si el JS no
   llega a activarlos, una red de seguridad CSS los muestra a los 4 s. */
.js [data-split]:not(.is-in) .w__i { animation: revela-seguro 0s 4s forwards; }
@keyframes revela-seguro { to { transform: none; } }
.w { display: inline-block; overflow: clip; vertical-align: top; padding-bottom: .12em; margin-bottom: -.12em; }
.w__i { display: inline-block; transform: translateY(108%); transition: transform 1s var(--ease) calc(var(--i, 0) * 55ms + var(--d, 0s)); }
.is-in > .w > .w__i, .is-in .w__i { transform: none; }
.no-js .w__i { transform: none; }

/* Sólo se apagan efectos intrusivos con "reducir movimiento" (ver guía de la skill) */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .marquee__track, .hero__wing, [data-parallax] { animation: none !important; }
}