/* Exercise Glossary stylesheet — brand-plain, mobile-first. Self-hosted Instrument Serif for
   headings only (see @font-face below); body text and UI chrome stay on the system font stack.
   Three brand hexes: rust #B5502E, dark ink #0E0C0B, grey #6C6458, plus --cream (#F7F7F6, taken
   verbatim from the Studio app's --paper token in src/document/document.css). The font is the
   only external reference this sheet makes, and it points at a sibling file copied into this
   same output tree on every build — still zero CDN, zero @import, zero third-party host.

   A CSS url() resolves against THIS STYLESHEET's own location, not the document that links it —
   that is why the single relative "fonts/..." path below works unchanged from both index.html
   (same directory as this file) and exercises/*.html (one level down). Do not "fix" this into a
   ../ variant; that would break it from index.html. Copied verbatim into
   glossary-site/dist/site.css on every build. */

:root {
  --ink: #0E0C0B;
  --grey: #6C6458;
  --rust: #B5502E;
  --cream: #F7F7F6;
  --hairline: rgba(108, 100, 88, 0.22);
}

@font-face {
  font-family: "Instrument Serif";
  src: url("fonts/InstrumentSerif-Regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  padding: 0;
  background: #ffffff;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

/* Detail page keeps the 42rem reading measure; the index runs much wider to fit the card grid. */
.page {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

.index {
  max-width: 75rem;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

/* Sits above the full-bleed hero on a plain white background so it stays reachable and legible
   regardless of how bright or dark the hero photo underneath it is. */
.back {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1rem 1rem 0;
}

a {
  color: var(--rust);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

h1,
.hero-title,
.card-name {
  font-family: "Instrument Serif", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, serif;
  font-weight: 400;
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 1rem;
  color: var(--ink);
}

.meta,
.total,
.provenance {
  color: var(--grey);
  font-size: 0.875rem;
}

/* Detail-page hero — full-bleed (runs to the container edge, outside .page's 42rem reading
   measure), built from image index 0. Same ink-gradient device as the index cards. */
.hero {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  color: var(--cream);
  background: var(--ink);
  margin: 1rem 0 1.5rem;
}

@media (min-width: 40rem) {
  .hero {
    aspect-ratio: 21 / 9;
  }
}

.hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(14, 12, 11, 0.92) 0%,
    rgba(14, 12, 11, 0.70) 38%,
    rgba(14, 12, 11, 0) 72%
  );
}

.hero-title {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 1.25rem 1.25rem 1.5rem;
  font-size: 2rem;
  color: var(--cream);
}

@media (min-width: 40rem) {
  .hero-title {
    font-size: 2.75rem;
    padding: 2rem 2rem 2.5rem;
  }
}

/* Non-interactive chips (D-11): plain spans, never links. Data rendered verbatim, lowercase,
   per D-07 — equipment first, then primary muscles. */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 1.5rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  font-size: 0.8125rem;
  color: var(--grey);
  background: #ffffff;
}

/* D-07/T-FMT-03: states plainly that a representative entry's photo belongs to a named sibling,
   not to this exercise. Same bordered-chip treatment as .tag, but a block-level note rather than
   an inline pill, since it carries a full sentence rather than a single value. */
.reference-note {
  margin: 0 0 1.5rem;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--hairline);
  border-radius: 0.5rem;
  font-size: 0.875rem;
  color: var(--grey);
  background: #ffffff;
}

/* D-08's no-fabrication rule: a disclosed instructions gap (currently only side-bridge) states
   the gap in place of the numbered steps rather than showing nothing or inventing text. Same
   bordered-note treatment as .reference-note. */
.instructions-gap-note {
  margin: 0 0 0.75rem;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--hairline);
  border-radius: 0.5rem;
  font-size: 0.875rem;
  color: var(--grey);
  background: #ffffff;
}

.images {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 0 0 1.5rem;
}

.images img {
  max-width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--hairline);
}

@media (min-width: 40rem) {
  .images {
    flex-direction: row;
  }

  .images img {
    flex: 1 1 0;
    min-width: 0;
  }
}

.instructions {
  margin: 0 0 1.5rem;
  padding-left: 1.5rem;
}

.instructions li {
  margin-bottom: 0.5rem;
  color: var(--ink);
}

.instructions li::marker {
  color: var(--rust);
  font-weight: 600;
}

.index-header {
  margin: 0 0 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--hairline);
}

.index-header h1 {
  margin-bottom: 0.25rem;
}

/* Controls — search + facet checkboxes, sitting above the grid. Deliberately not sticky (D-12):
   a sticky bar over a multi-row chip group eats too much of the mobile viewport, and the always-
   stated result count already makes scrolling back up cheap. */
.controls {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin: 0 0 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--hairline);
}

.search-field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  max-width: 24rem;
}

.search-field label {
  font-size: 0.8125rem;
  color: var(--grey);
}

.search-field input[type="search"] {
  font: inherit;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--hairline);
  border-radius: 0.25rem;
  color: var(--ink);
  background: #ffffff;
}

.search-field input[type="search"]:focus-visible {
  outline: 2px solid var(--rust);
  outline-offset: 1px;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  border: 0;
}

.filter-group legend {
  font-size: 0.8125rem;
  color: var(--grey);
  padding: 0;
  margin: 0 0.5rem 0 0;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  font-size: 0.8125rem;
  color: var(--ink);
  cursor: pointer;
  background: #ffffff;
}

.chip input[type="checkbox"] {
  accent-color: var(--rust);
  margin: 0;
}

.chip:has(input:checked) {
  border-color: var(--rust);
  color: var(--rust);
  background: rgba(181, 80, 46, 0.08);
}

.chip:focus-within {
  outline: 2px solid var(--rust);
  outline-offset: 1px;
}

.result-count {
  margin: 0;
  color: var(--grey);
  font-size: 0.875rem;
}

.empty-state {
  margin: 0 0 1.5rem;
  padding: 1.5rem;
  border: 1px dashed var(--hairline);
  border-radius: 0.25rem;
  color: var(--grey);
  text-align: center;
}

.empty-state[hidden] {
  display: none;
}

.empty-state button {
  margin-top: 0.5rem;
  font: inherit;
  color: var(--rust);
  background: none;
  border: 1px solid var(--rust);
  border-radius: 0.25rem;
  padding: 0.4rem 0.9rem;
  cursor: pointer;
}

.empty-state button:focus-visible {
  outline: 2px solid var(--rust);
  outline-offset: 1px;
}

/* Card grid — mobile-first: two columns fit at a 375px phone width, more as the viewport widens. */
.index-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(9.5rem, 1fr));
  gap: 0.75rem;
  margin: 0 0 1.5rem;
  padding: 0;
}

@media (min-width: 60rem) {
  .index-grid {
    grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr));
    gap: 1rem;
  }
}

.index-grid li[hidden] {
  display: none;
}

.card {
  position: relative;
  display: block;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: 0.25rem;
  color: var(--cream);
  background: var(--ink);
}

.card:hover .card-name,
.card:focus-visible .card-name {
  text-decoration: underline;
}

.card:focus-visible {
  outline: 3px solid var(--rust);
  outline-offset: 2px;
}

.card img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(14, 12, 11, 0.92) 0%,
    rgba(14, 12, 11, 0.70) 38%,
    rgba(14, 12, 11, 0) 72%
  );
}

.card-name {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.6rem 0.75rem;
  color: var(--cream);
  font-size: 1.1rem;
  line-height: 1.25;
}

footer.provenance {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--hairline);
  color: var(--grey);
}

footer.provenance a {
  color: var(--rust);
}