/* ============================================================================
   INGEMET · BASE
   Reset, tipografía, primitivas de layout y motion.
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  min-width: 320px;
  overflow-x: clip;
  background: var(--ink);
  color: var(--chalk);
  font-family: var(--font-display);
  font-size: var(--t-base);
  font-weight: 400;
  line-height: var(--lh-normal);
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body.is-locked {
  overflow: hidden;
}

img,
svg,
video,
picture {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
  border: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  border: 0;
  background: none;
  color: inherit;
  cursor: pointer;
  font: inherit;
}

input,
textarea,
select {
  font: inherit;
  color: inherit;
}

ul,
ol {
  list-style: none;
}

table {
  border-collapse: collapse;
  width: 100%;
}

::selection {
  background: var(--teal);
  color: var(--ink);
}

:focus-visible {
  outline: 2px solid var(--teal-bright);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

/* --- Tipografía ---------------------------------------------------------- */

h1,
h2,
h3,
h4 {
  font-weight: 600;
  line-height: var(--lh-snug);
  letter-spacing: var(--track-display);
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

.u-mono {
  font-family: var(--font-mono);
  font-size: var(--t-mono);
  font-weight: 500;
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
}

.u-lead {
  font-size: var(--t-lg);
  line-height: var(--lh-relaxed);
  color: var(--fog);
  max-width: var(--measure);
}

.u-measure {
  max-width: var(--measure);
}

.u-dim {
  color: var(--fog);
}

.u-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* Texto en filo: relleno hueco con contorno. Se usa una sola vez por página. */
.u-hollow {
  color: transparent;
  -webkit-text-stroke: 1px var(--fog-dim);
}

.u-accent {
  color: var(--teal);
}

/* --- Layout -------------------------------------------------------------- */

.wrap {
  width: min(var(--container), 100% - var(--gutter) * 2);
  margin-inline: auto;
}

.wrap--narrow {
  width: min(var(--container-narrow), 100% - var(--gutter) * 2);
  margin-inline: auto;
}

.band {
  position: relative;
  padding-block: var(--section-y);
}

.band--tight {
  padding-block: calc(var(--section-y) * 0.62);
}

.band--alt {
  background: var(--ink-2);
}

/* Regla de sección: hairline con marca de inicio, como una hoja de plano. */
.rule {
  position: relative;
  height: 1px;
  background: var(--line);
  border: 0;
}

.rule::before {
  content: "";
  position: absolute;
  inset-block-start: -2px;
  inset-inline-start: 0;
  width: 44px;
  height: 5px;
  background: var(--teal);
}

/* --- Retícula de fondo ---------------------------------------------------
   Cuatro reglas verticales finas que recorren todo el documento. Da la
   sensación de hoja técnica sin ruido de textura.                          */

.gridlines {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  width: min(var(--container), 100% - var(--gutter) * 2);
  margin-inline: auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  opacity: 0.55;
}

.gridlines span {
  border-inline-start: 1px solid var(--line-soft);
}

.gridlines span:last-child {
  border-inline-end: 1px solid var(--line-soft);
}

@media (max-width: 720px) {
  .gridlines {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --- Etiquetas de sección ------------------------------------------------ */

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-family: var(--font-mono);
  font-size: var(--t-mono);
  font-weight: 500;
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--fog-dim);
}

.tag::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--teal);
}

.tag--amber::before {
  background: var(--amber);
}

/* --- Encabezado de sección ----------------------------------------------- */

.head {
  display: grid;
  gap: var(--s-5);
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  align-items: end;
  margin-block-end: var(--s-8);
}

.head__title {
  font-size: var(--t-3xl);
  font-weight: 600;
  margin-block-start: var(--s-4);
}

.head__title em {
  font-style: normal;
  color: var(--fog-dim);
}

.head__aside {
  font-size: var(--t-base);
  color: var(--fog);
  line-height: var(--lh-relaxed);
  max-width: 46ch;
  padding-block-end: var(--s-2);
}

@media (max-width: 860px) {
  .head {
    grid-template-columns: 1fr;
    align-items: start;
  }
}

/* --- Motion primitivo ----------------------------------------------------
   Un solo mecanismo de aparición para todo el sitio. El JS añade .is-in.   */

[data-reveal] {
  opacity: 0;
  transform: translate3d(0, 22px, 0);
  transition:
    opacity var(--d-reveal) var(--ease-out),
    transform var(--d-reveal) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}

[data-reveal].is-in {
  opacity: 1;
  transform: none;
  will-change: auto;
}

[data-reveal="fade"] {
  transform: none;
}

[data-reveal="right"] {
  transform: translate3d(-26px, 0, 0);
}

[data-reveal="clip"] {
  opacity: 1;
  transform: none;
  clip-path: inset(0 0 100% 0);
  transition: clip-path var(--d-reveal) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}

[data-reveal="clip"].is-in {
  clip-path: inset(0 0 0 0);
}

/* Aparición por líneas del titular principal. */
.stagger-line {
  display: block;
  overflow: hidden;
}

.stagger-line > span {
  display: block;
  transform: translate3d(0, 105%, 0);
  transition: transform 1s var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}

.is-ready .stagger-line > span {
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    clip-path: none;
  }

  .stagger-line > span {
    transform: none;
  }
}