@import url("https://fonts.googleapis.com/css2?family=Archivo:wght@500;600;700&family=Archivo+Black&family=IBM+Plex+Mono:wght@400;500&display=swap");

@font-face {
  font-family: "Indus Archive";
  src: url("assets/indus/indus-font.woff2") format("woff2");
  font-display: block;
}

:root {
  --ink: #050505;
  --paper: #efefeb;
  --acid: #efff17;
  --violet: #b67dff;
  --line-dark: rgba(5, 5, 5, 0.25);
  --line-light: rgba(239, 239, 235, 0.24);
  --muted: #aaa9a1;
  --gutter: clamp(1rem, 3vw, 3.5rem);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  background: var(--ink);
  color: var(--paper);
  font-family: Arial, Helvetica, sans-serif;
}
button, input, select { font: inherit; }
button, select { cursor: pointer; }
a { color: inherit; text-decoration: none; }
.mono {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.8rem 1rem;
  background: var(--acid);
  color: var(--ink);
}
.skip-link:focus { top: 1rem; }

.explorer-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: 4.4rem 1fr auto;
  min-height: 3.5rem;
  border-bottom: 1px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  font-family: "Archivo Black", Arial, sans-serif;
  text-transform: uppercase;
}
.explorer-wordmark,
.explorer-title,
.explorer-status { display: flex; align-items: center; }
.explorer-wordmark { justify-content: center; background: var(--acid); font-size: 1.15rem; }
.explorer-title { padding: 0 var(--gutter); border-right: 1px solid var(--ink); }
.explorer-status { gap: 0.6rem; padding: 0 var(--gutter); font: 500 0.65rem/1 "IBM Plex Mono", monospace; letter-spacing: 0.08em; }
.explorer-status i { width: 0.55rem; height: 0.55rem; border-radius: 50%; background: #17d762; box-shadow: 0 0 0 0.2rem rgba(23, 215, 98, 0.13); }

.intro {
  min-height: min(46rem, calc(100vh - 3.5rem));
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: auto 1fr auto;
  padding: clamp(2rem, 5vw, 5rem) var(--gutter) 0;
  background:
    linear-gradient(90deg, transparent calc(50% - 0.5px), rgba(239,239,235,.12) 50%, transparent calc(50% + 0.5px)),
    var(--ink);
}
.intro-index { grid-column: 1 / -1; color: var(--acid); }
.intro h1 {
  grid-column: 1 / 11;
  grid-row: 2;
  align-self: center;
  margin: 3rem 0;
  font-family: "Archivo Black", Arial, sans-serif;
  font-size: clamp(3.6rem, 9.2vw, 8.75rem);
  line-height: 0.8;
  letter-spacing: -0.075em;
}
.intro h1 span { display: block; }
.intro h1 span:last-child { color: var(--acid); }
.intro-glyph {
  grid-column: 10 / -1;
  grid-row: 2;
  align-self: start;
  justify-self: center;
  margin-top: clamp(2rem, 5vw, 5rem);
  color: var(--acid);
  font-family: "Indus Archive";
  font-size: clamp(7rem, 13vw, 13rem);
  line-height: 1;
}
.intro > p {
  grid-column: 9 / -1;
  grid-row: 2;
  align-self: end;
  margin: 0 0 2rem;
  max-width: 31rem;
  font: 500 clamp(1rem, 1.4vw, 1.25rem)/1.5 "Archivo", Arial, sans-serif;
}
.intro-ledger {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line-light);
}
.intro-ledger span { padding: 1.2rem 0; border-right: 1px solid var(--line-light); }
.intro-ledger span:not(:first-child) { padding-left: 1.2rem; }
.intro-ledger span:last-child { border-right: 0; }
.intro-ledger strong { color: var(--acid); font-size: 1rem; }

.workbench { background: var(--paper); color: var(--ink); }
.workbench-bar {
  position: sticky;
  top: 3.5rem;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(15rem, 1.3fr) minmax(13rem, 0.8fr) auto;
  border-block: 1px solid var(--ink);
  background: var(--paper);
}
.search-field,
.select-field,
.view-switch { min-height: 5.5rem; padding: 0.8rem var(--gutter); border-right: 1px solid var(--ink); }
.search-field,
.select-field { display: grid; align-content: center; gap: 0.5rem; }
.search-field input,
.select-field select {
  width: 100%;
  min-width: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  outline-offset: 0.3rem;
  background: transparent;
  color: var(--ink);
  font: 700 1.35rem/1 "Archivo", Arial, sans-serif;
}
.search-field input::placeholder { color: #82827b; }
.view-switch { display: grid; grid-template-columns: repeat(2, auto); align-content: center; gap: 0.4rem; }
.view-switch > span { grid-column: 1 / -1; }
.view-switch button {
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
}
.view-switch button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }

.workspace { display: grid; grid-template-columns: minmax(0, 1fr) clamp(18rem, 27vw, 27rem); align-items: start; }
.sign-browser { min-width: 0; border-right: 1px solid var(--ink); }
.section-label,
.inspector-topline {
  display: flex;
  min-height: 3.2rem;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 var(--gutter);
  border-bottom: 1px solid var(--ink);
}
.section-label h2,
.inspector-topline h2 { margin: 0; font: inherit; }
.sign-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(7.25rem, 1fr)); }
.sign-grid[data-density="large"] { grid-template-columns: repeat(auto-fill, minmax(12rem, 1fr)); }
.sign-card {
  position: relative;
  min-height: 9rem;
  display: grid;
  place-items: center;
  padding: 1.4rem 0.7rem 1.7rem;
  border: 0;
  border-right: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
}
.sign-grid[data-density="large"] .sign-card { min-height: 15rem; }
.sign-card:hover,
.sign-card:focus-visible,
.sign-card[aria-pressed="true"] { background: var(--acid); }
.sign-glyph {
  font-family: "Indus Archive";
  font-size: clamp(3rem, 5vw, 5.5rem);
  line-height: 1;
  font-weight: 400;
}
.sign-grid[data-density="large"] .sign-glyph { font-size: clamp(5rem, 8vw, 8rem); }
.sign-card small {
  position: absolute;
  left: 0.65rem;
  bottom: 0.55rem;
  font: 500 0.65rem/1 "IBM Plex Mono", monospace;
  letter-spacing: 0.08em;
}
.sign-card em {
  position: absolute;
  right: 0.65rem;
  top: 0.55rem;
  font: 400 0.58rem/1 "IBM Plex Mono", monospace;
  font-style: normal;
}
.load-more,
.add-sign,
.composer-actions button {
  min-height: 3.5rem;
  border: 0;
  border-radius: 0;
  background: var(--ink);
  color: var(--paper);
}
.load-more { width: 100%; }
.load-more:hover,
.load-more:focus-visible,
.add-sign:hover,
.add-sign:focus-visible { background: var(--violet); color: var(--ink); }
.load-more[hidden] { display: none; }

.inspector { position: sticky; top: 9rem; }
.inspector-topline { padding-inline: 1rem; }
.hero-glyph {
  min-height: 20rem;
  display: grid;
  place-items: center;
  border-bottom: 1px solid var(--ink);
  background: var(--acid);
  font-family: "Indus Archive";
  font-size: clamp(8rem, 15vw, 14rem);
  line-height: 1;
}
.sign-identity { display: flex; align-items: baseline; justify-content: space-between; padding: 1rem; border-bottom: 1px solid var(--ink); }
.sign-identity strong { font: 400 clamp(3rem, 6vw, 5.5rem)/0.9 "Archivo Black", Arial, sans-serif; letter-spacing: -0.06em; }
.sign-facts { margin: 0; }
.sign-facts div { display: flex; justify-content: space-between; gap: 1rem; padding: 0.9rem 1rem; border-bottom: 1px solid var(--line-dark); }
.sign-facts dt, .sign-facts dd { margin: 0; }
.sign-facts dd { text-align: right; }
.add-sign { width: calc(100% - 2rem); margin: 1rem; background: var(--ink); }
.inspector-note { margin: 0; padding: 0 1rem 1.4rem; color: #5e5e59; font-size: 0.78rem; line-height: 1.5; }

.composer { padding: clamp(2rem, 4vw, 4rem) var(--gutter); background: var(--acid); color: var(--ink); }
.composer .section-label { padding-inline: 0; }
.sequence {
  min-height: 14rem;
  display: flex;
  flex-direction: row-reverse;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: clamp(1rem, 3vw, 3rem);
  padding: 2rem 0;
}
.sequence p { max-width: 30rem; text-align: center; font: 500 0.75rem/1.5 "IBM Plex Mono", monospace; letter-spacing: 0.08em; }
.sequence-sign { position: relative; border: 0; background: transparent; color: var(--ink); font: 400 clamp(5rem, 10vw, 9rem)/1 "Indus Archive"; }
.sequence-sign::after { content: attr(data-code); position: absolute; left: 50%; bottom: -0.25rem; transform: translateX(-50%); font: 500 0.6rem/1 "IBM Plex Mono", monospace; letter-spacing: 0.08em; }
.composer-actions { display: flex; justify-content: flex-end; }
.composer-actions button { padding-inline: 1rem; border-right: 1px solid var(--paper); }
.composer-actions button:disabled { opacity: 0.4; cursor: not-allowed; }

.explorer-footer { display: grid; grid-template-columns: 1fr auto 1fr; padding: 1.5rem var(--gutter); border-top: 1px solid var(--line-light); }
.explorer-footer a:last-child { text-align: right; }
.explorer-footer span { color: var(--muted); }

@media (max-width: 900px) {
  .intro h1 { grid-column: 1 / -1; }
  .intro > p { grid-column: 7 / -1; }
  .workspace { grid-template-columns: 1fr; }
  .sign-browser { border-right: 0; }
  .inspector { position: static; display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--ink); }
  .inspector-topline, .sign-identity, .sign-facts, .add-sign, .inspector-note { grid-column: 2; }
  .hero-glyph { grid-column: 1; grid-row: 1 / 7; min-height: 100%; border-right: 1px solid var(--ink); }
}

@media (max-width: 660px) {
  .explorer-header { grid-template-columns: 4rem 1fr; }
  .explorer-status { display: none; }
  .explorer-title { border-right: 0; }
  .intro { min-height: 40rem; display: flex; flex-direction: column; justify-content: space-between; }
  .intro h1 { font-size: clamp(3.25rem, 15vw, 5.4rem); margin-block: 3rem; }
  .intro-glyph {
    align-self: center;
    margin: 0 0 1.5rem;
    font-size: 8rem;
  }
  .intro > p { align-self: auto; }
  .intro-ledger { grid-template-columns: 1fr; width: 100%; }
  .intro-ledger span, .intro-ledger span:not(:first-child) { padding: 0.85rem 0; border-right: 0; border-bottom: 1px solid var(--line-light); }
  .workbench-bar { position: static; grid-template-columns: 1fr 1fr; }
  .search-field { grid-column: 1 / -1; }
  .select-field { border-top: 1px solid var(--ink); }
  .view-switch { border-top: 1px solid var(--ink); border-right: 0; }
  .sign-grid { grid-template-columns: repeat(3, 1fr); }
  .sign-grid[data-density="large"] { grid-template-columns: repeat(2, 1fr); }
  .sign-card { min-height: 7.5rem; }
  .sign-glyph { font-size: 3.1rem; }
  .inspector { grid-template-columns: 1fr; }
  .hero-glyph { grid-column: 1; grid-row: auto; min-height: 16rem; border-right: 0; }
  .inspector-topline, .sign-identity, .sign-facts, .add-sign, .inspector-note { grid-column: 1; }
  .explorer-footer { grid-template-columns: 1fr auto; gap: 1rem; }
  .explorer-footer span { display: none; }
}

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