/* ============================================================
   IGNOTUSLABS — layout.css
   Structural layout: navigation, sections, grids, spacing,
   and responsive behavior. No decoration lives here.
   ============================================================ */

/* ------------------------------------------------------------
   Page shell
   ------------------------------------------------------------ */

.page {
  position: relative;
  z-index: var(--z-content);
}

.section {
  position: relative;
  padding: var(--space-9) var(--gutter);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.section--tall {
  min-height: 100vh;
}

.section__inner {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
}

.section__inner--prose {
  max-width: var(--container-prose);
}

.section__inner--wide {
  max-width: var(--container-wide);
}

/* Section index label — quiet scientific numbering */
.section__label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.section__label .index {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: var(--tracking-wider);
  color: var(--color-tertiary);
  text-transform: uppercase;
}

.section__label .rule {
  flex: 0 0 2.5rem;
  height: 1px;
  background: var(--color-divider);
}

.section__label .name {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: var(--tracking-widest);
  color: var(--color-secondary);
  text-transform: uppercase;
}

/* ------------------------------------------------------------
   Navigation
   ------------------------------------------------------------ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: var(--z-nav);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 var(--gutter);
  pointer-events: none;
  opacity: 0;
  transform: translateY(-0.5rem);
  transition: opacity var(--dur-base) var(--ease-quiet),
    transform var(--dur-base) var(--ease-quiet);
}

.nav.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.nav__brand {
  grid-column: 2;
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-widest);
  pointer-events: auto;
}

.nav__menu {
  grid-column: 3;
  justify-self: end;
  display: flex;
  gap: var(--space-4);
  pointer-events: auto;
}

.nav__link {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: var(--tracking-wider);
  color: var(--color-secondary);
  text-transform: uppercase;
  position: relative;
  padding: var(--space-1) 0;
  transition: color var(--dur-fast) var(--ease-precise);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-base) var(--ease-quiet);
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--color-primary);
}

.nav__link:hover::after,
.nav__link.is-active::after {
  transform: scaleX(1);
}

/* ------------------------------------------------------------
   Hero
   ------------------------------------------------------------ */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-9) var(--gutter);
}

.hero__glyph-stage {
  position: relative;
  width: min(90vw, 720px);
  aspect-ratio: 360 / 56;
  height: auto;
  /* Fallback for browsers without aspect-ratio support */
  min-height: 56px;
  margin-bottom: var(--space-6);
}

.hero__manifesto {
  max-width: var(--container-prose);
}

.hero__explore {
  position: absolute;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

/* ------------------------------------------------------------
   Research — knowledge graph
   ------------------------------------------------------------ */

.research {
  min-height: 100vh;
}

.research__stage {
  position: relative;
  width: 100%;
  height: min(70vh, 620px);
  margin-top: var(--space-5);
}

.research__detail {
  position: absolute;
  top: 0;
  right: 0;
  width: min(340px, 38%);
  pointer-events: none;
}

.research__legend {
  position: absolute;
  bottom: 0;
  left: 0;
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* ------------------------------------------------------------
   Projects
   ------------------------------------------------------------ */

.projects {
  min-height: auto;
  padding: var(--space-8) var(--gutter) var(--space-9);
}

.project {
  position: relative;
  min-height: 92vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: var(--space-6);
  padding: var(--space-7) 0;
  border-top: 1px solid var(--color-divider);
}

.project:last-child {
  border-bottom: 1px solid var(--color-divider);
}

.project__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.project__diagram {
  aspect-ratio: 1 / 1;
  width: 100%;
  max-width: 460px;
  /* Fallback for browsers without aspect-ratio support */
  min-height: 280px;
  justify-self: center;
}

/* Alternate sides for rhythm */
.project:nth-child(even) .project__diagram {
  order: -1;
}

/* ------------------------------------------------------------
   Artifacts
   ------------------------------------------------------------ */

.artifacts {
  min-height: 100vh;
}

.artifacts__grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.artifact {
  grid-column: span 4;
  border: 1px solid var(--color-divider);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-height: 280px;
}

.artifact--wide {
  grid-column: span 8;
}

.artifact--tall {
  grid-row: span 2;
}

.artifact__stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ------------------------------------------------------------
   Journal
   ------------------------------------------------------------ */

.journal {
  min-height: 100vh;
}

.journal__list {
  display: flex;
  flex-direction: column;
  margin-top: var(--space-5);
}

.entry {
  display: grid;
  grid-template-columns: 9rem 1fr auto;
  gap: var(--space-4);
  align-items: baseline;
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-divider);
  transition: background var(--dur-fast) var(--ease-precise);
}

.entry:last-child {
  border-bottom: 1px solid var(--color-divider);
}

.entry__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: var(--tracking-wider);
  color: var(--color-tertiary);
  text-transform: uppercase;
}

.entry__title {
  font-size: var(--fs-h4);
}

.entry__tag {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: var(--tracking-wider);
  color: var(--color-secondary);
  text-transform: uppercase;
}

/* ------------------------------------------------------------
   About
   ------------------------------------------------------------ */

.about {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.about__manifesto {
  max-width: 52rem;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
}

/* ------------------------------------------------------------
   Footer
   ------------------------------------------------------------ */

.footer {
  padding: var(--space-5) var(--gutter);
  border-top: 1px solid var(--color-divider);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.footer__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: var(--tracking-wider);
  color: var(--color-tertiary);
  text-transform: uppercase;
}

.footer__right {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.footer__beian {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: var(--tracking-wider);
  color: var(--color-tertiary);
  text-decoration: none;
  text-transform: none;
  transition: color var(--dur-fast) var(--ease-precise);
}

.footer__beian:hover {
  color: var(--color-secondary);
}

/* ------------------------------------------------------------
   Responsive
   ------------------------------------------------------------ */

@media (max-width: 880px) {
  :root {
    --fs-display: 4.5rem;
    --fs-h1: 3rem;
    --fs-h2: 2rem;
  }

  .section {
    padding: var(--space-8) var(--gutter);
  }

  .nav {
    grid-template-columns: 1fr 1fr;
  }

  .nav__brand {
    grid-column: 1;
    justify-self: start;
  }

  .nav__menu {
    gap: var(--space-3);
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .nav__link {
    font-size: 0.625rem;
  }

  .project {
    grid-template-columns: 1fr;
    gap: var(--space-4);
    min-height: auto;
    padding: var(--space-6) 0;
  }

  .project:nth-child(even) .project__diagram {
    order: 0;
  }

  .artifact,
  .artifact--wide {
    grid-column: span 12;
  }

  .entry {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

  .research__detail {
    position: static;
    width: 100%;
    margin-top: var(--space-4);
  }

  .hero__glyph-stage {
    width: min(80vw, 560px);
    aspect-ratio: 360 / 56;
    height: auto;
  }
}

@media (max-width: 480px) {
  :root {
    --fs-display: 3.25rem;
    --fs-h1: 2.25rem;
  }

  .nav__menu {
    gap: var(--space-2);
  }
}