/* CV-05 Material Fieldbook — commodity reference (P05, C5/H5/F5/K5/I5/D5/R5/M5/T5/S5).
   Visual grammar reused from samples/05-material-fieldbook/styles.css: cream fibrous paper,
   Georgia display, clay/green accents, specimen frames, marginal labels, ruled notes. */

:root {
  color-scheme: light;
  --paper: #f4efe3;
  --paper-deep: #e8dfcd;
  --paper-light: #fffdf6;
  --ink: #17271f;
  --ink-soft: #3f5047;
  --green: #1c4a3a;
  --green-dark: #0d2d23;
  --clay: #9f3f27;
  --clay-dark: #722914;
  --rule: #a99f8b;
  --rule-soft: #d6cdb9;
  --focus: #ffbf47;
  --shadow: 0 14px 40px rgb(23 39 31 / 12%);
  --serif: Georgia, "Times New Roman", serif;
  --sans: "Avenir Next", Avenir, "Segoe UI", Arial, sans-serif;
}

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

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  min-width: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  overflow-wrap: anywhere;
}

svg,
img {
  max-width: 100%;
}

a {
  color: var(--green-dark);
  text-decoration-thickness: 0.1em;
  text-underline-offset: 0.2em;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  box-shadow: 0 0 0 2px var(--green-dark);
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.15;
  color: var(--ink);
}

p,
ul,
ol,
dl {
  margin: 0;
}

.kicker {
  margin: 0 0 0.5rem;
  color: var(--clay-dark);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* skip link */
.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.75rem 1rem;
  transform: translateY(-180%);
  background: var(--paper-light);
  border: 2px solid var(--green-dark);
  color: var(--green-dark);
  font-weight: 800;
}

.skip-link:focus {
  transform: translateY(0);
}

/* header */
.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--paper-light);
}

.masthead {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  align-items: baseline;
  justify-content: space-between;
  width: min(100% - 2rem, 1320px);
  margin-inline: auto;
  padding-block: 1rem 0.75rem;
}

.brand {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.9rem;
  align-items: baseline;
}

.brand-name {
  font-family: var(--serif);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--green-dark);
}

.brand-context {
  color: var(--ink-soft);
}

.fieldbook-mark {
  color: var(--clay-dark);
  font-family: var(--serif);
  font-style: italic;
}

.notice {
  width: min(100% - 2rem, 1320px);
  margin: 0 auto 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--green-dark);
  border-left: 6px solid var(--clay);
  background: var(--paper);
  color: var(--ink);
  font-weight: 600;
}

/* book layout: spine (nav) + leaves (main) */
.book {
  width: min(100% - 2rem, 1320px);
  margin-inline: auto;
  padding-block: 1.5rem 3rem;
}

.spine {
  margin-bottom: 2rem;
  padding: 1rem 1rem 1.25rem;
  border: 1px solid var(--rule);
  border-left: 6px solid var(--green-dark);
  background: var(--paper-light);
}

.rail-title {
  margin-bottom: 0.5rem;
  color: var(--green-dark);
  font-family: var(--serif);
  font-size: 1.25rem;
}

.rail,
.rail ul {
  list-style: none;
  padding: 0;
}

.rail > li {
  padding-block: 0.25rem;
  border-top: 1px solid var(--rule-soft);
}

.rail > li:first-child {
  border-top: 0;
}

.rail a {
  display: inline-block;
  min-height: 44px;
  padding: 0.55rem 0.25rem;
  line-height: 1.4;
}

.rail-chapters {
  margin: 0.25rem 0 0 0.75rem;
}

.rail-group {
  padding-block: 0.35rem;
}

.rail-cat {
  display: block;
  color: var(--clay-dark);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.rail-group ul {
  margin-left: 0.5rem;
}

.rail-group a {
  font-size: 1rem;
}

main {
  min-width: 0;
}

/* overview leaf */
.overview {
  padding: 1.5rem 0 2.5rem;
  border-bottom: 1px solid var(--rule);
}

.overview h1 {
  max-width: 20ch;
  margin-bottom: 1rem;
  font-size: clamp(2rem, 4.5vw, 3.4rem);
}

.definition {
  max-width: 62ch;
  margin-bottom: 1rem;
  font-family: var(--serif);
  font-size: 1.2rem;
}

.dataset-line {
  margin-bottom: 1rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--rule);
  background: var(--paper-light);
  color: var(--ink);
  font-size: 1rem;
}

.how-to-read {
  max-width: 68ch;
  margin-bottom: 1rem;
  padding-left: 1rem;
  border-left: 4px solid var(--clay);
  color: var(--ink);
}

.back-link a {
  display: inline-block;
  min-height: 44px;
  padding: 0.6rem 0.25rem;
  font-weight: 700;
}

/* layer control */
.layer-section {
  padding-block: 2.5rem;
  border-bottom: 1px solid var(--rule);
}

.layer-inspector {
  display: grid;
  gap: 1.25rem;
  padding: clamp(1.25rem, 3vw, 2.5rem);
  background: var(--green-dark);
  color: #ffffff;
  box-shadow: var(--shadow);
}

.layer-inspector .kicker {
  color: #f5bd88;
}

.layer-inspector h2 {
  max-width: 18ch;
  margin-bottom: 0.75rem;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  color: #ffffff;
}

.layer-inspector p {
  color: #eef4ef;
}

.layer-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.layer-controls button {
  min-width: 44px;
  min-height: 44px;
  padding: 0.6rem 1.1rem;
  border: 2px solid #f5bd88;
  border-radius: 999px;
  background: transparent;
  color: #ffffff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.layer-controls button[aria-pressed="true"] {
  background: #f5bd88;
  color: var(--green-dark);
}

.layer-controls button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  box-shadow: 0 0 0 2px #ffffff;
}

.layer-state {
  font-size: 1rem;
}

.layer-state strong {
  color: #f5bd88;
}

/* no-JS: the control is not offered; the field guide stands alone */
html.no-js .layer-controls,
html.no-js .layer-state {
  display: none;
}

.field-guide {
  margin-top: 1.25rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--rule);
  background: var(--paper-light);
}

.static-label {
  margin-bottom: 0.75rem;
}

.layer-key div {
  display: grid;
  grid-template-columns: 7rem minmax(0, 1fr);
  gap: 0.5rem 1rem;
  padding-block: 0.4rem;
  border-top: 1px solid var(--rule-soft);
}

.layer-key dt {
  color: var(--clay-dark);
  font-weight: 700;
}

.layer-key dd {
  margin: 0;
}

/* catalog */
.catalog {
  padding-block: 2.5rem;
}

.section-heading {
  margin-bottom: 1rem;
}

.section-heading h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
}

.section-intro {
  max-width: 64ch;
  margin-bottom: 2.5rem;
  font-family: var(--serif);
  font-size: 1.15rem;
}

.chapter {
  margin-bottom: 2rem;
}

.chapter-kicker {
  margin-bottom: 1.5rem;
  padding: 0.5rem 0;
  border-top: 3px double var(--rule);
  border-bottom: 1px solid var(--rule);
  color: var(--green-dark);
  font-family: var(--serif);
  font-size: 1.35rem;
}

.chapter-word {
  margin-right: 0.5rem;
  color: var(--clay-dark);
  font-family: var(--sans);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.item {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--rule-soft);
}

/* specimen plate: bounded non-text surface; texture never behind body text */
.plate {
  position: relative;
  margin: 0;
  padding: 0.85rem;
  border: 1px solid var(--rule);
  background: var(--paper-light);
  box-shadow: var(--shadow);
}

.plate-number {
  margin-bottom: 0.6rem;
  color: var(--clay-dark);
  font-family: var(--serif);
  font-size: 1.25rem;
}

.plate-word {
  margin-right: 0.35rem;
  font-family: var(--sans);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.plate-geometry {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border: 1px solid #0d2d23;
  background:
    repeating-linear-gradient(17deg, transparent 0 17px, rgb(255 253 246 / 45%) 18px 19px),
    linear-gradient(145deg, #e3d7bf, #b9bca6 55%, #dcc3a4);
}

.plate-geometry i {
  position: absolute;
  display: block;
}

/* Energy: concentric rings and one radial rule */
.plate--energy .plate-geometry i:nth-child(1) { top: 18%; left: 22%; width: 46%; aspect-ratio: 1; border: 2px solid #0d2d23; border-radius: 50%; }
.plate--energy .plate-geometry i:nth-child(2) { top: 30%; left: 34%; width: 22%; aspect-ratio: 1; border: 2px solid #722914; border-radius: 50%; }
.plate--energy .plate-geometry i:nth-child(3) { top: 39%; left: 43%; width: 4%; aspect-ratio: 1; border-radius: 50%; background: #722914; }
.plate--energy .plate-geometry i:nth-child(4) { top: 50%; left: 8%; width: 84%; height: 2px; background: #0d2d23; transform: rotate(-24deg); }
.plate--energy .plate-geometry i:nth-child(5) { top: 74%; left: 60%; width: 30%; height: 1px; background: #722914; }

/* Base metals: cross-hatch block and a measuring rule */
.plate--base-metals .plate-geometry i:nth-child(1) { top: 20%; left: 16%; width: 44%; height: 56%; border: 2px solid #0d2d23; background: repeating-linear-gradient(45deg, transparent 0 7px, #0d2d23 7px 8px); }
.plate--base-metals .plate-geometry i:nth-child(2) { top: 34%; left: 30%; width: 44%; height: 40%; border: 2px solid #722914; background: repeating-linear-gradient(-45deg, transparent 0 9px, #722914 9px 10px); }
.plate--base-metals .plate-geometry i:nth-child(3) { top: 12%; left: 70%; width: 2px; height: 76%; background: #0d2d23; }
.plate--base-metals .plate-geometry i:nth-child(4) { top: 12%; left: 66%; width: 10%; height: 2px; background: #0d2d23; }
.plate--base-metals .plate-geometry i:nth-child(5) { top: 87%; left: 66%; width: 10%; height: 2px; background: #0d2d23; }

/* Bulk: field of dots and a horizon rule */
.plate--bulk .plate-geometry i:nth-child(1) { top: 22%; left: 12%; width: 76%; height: 50%; background: radial-gradient(circle, #0d2d23 0 3px, transparent 3.5px) 0 0 / 22px 22px; }
.plate--bulk .plate-geometry i:nth-child(2) { top: 72%; left: 8%; width: 84%; height: 2px; background: #0d2d23; }
.plate--bulk .plate-geometry i:nth-child(3) { top: 40%; left: 40%; width: 20%; aspect-ratio: 1; border: 2px solid #722914; border-radius: 50%; }
.plate--bulk .plate-geometry i:nth-child(4) { top: 78%; left: 20%; width: 60%; height: 1px; background: #722914; }
.plate--bulk .plate-geometry i:nth-child(5) { top: 84%; left: 32%; width: 36%; height: 1px; background: #722914; }

/* Critical minerals: angular facets */
.plate--critical-minerals .plate-geometry i:nth-child(1) { top: 20%; left: 30%; width: 40%; height: 55%; border: 2px solid #0d2d23; clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%); background: #cdbfa2; }
.plate--critical-minerals .plate-geometry i:nth-child(2) { top: 30%; left: 40%; width: 20%; height: 30%; background: #722914; clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%); }
.plate--critical-minerals .plate-geometry i:nth-child(3) { top: 12%; left: 10%; width: 80%; height: 1px; background: #0d2d23; }
.plate--critical-minerals .plate-geometry i:nth-child(4) { top: 86%; left: 10%; width: 80%; height: 1px; background: #0d2d23; }
.plate--critical-minerals .plate-geometry i:nth-child(5) { top: 12%; left: 50%; width: 1px; height: 74%; background: #722914; }

/* Agri: arcs and a stem */
.plate--agri .plate-geometry i:nth-child(1) { top: 20%; left: 26%; width: 48%; aspect-ratio: 1; border: 2px solid #0d2d23; border-radius: 50% 0; transform: rotate(45deg); }
.plate--agri .plate-geometry i:nth-child(2) { top: 32%; left: 38%; width: 24%; aspect-ratio: 1; border: 2px solid #722914; border-radius: 50% 0; transform: rotate(45deg); }
.plate--agri .plate-geometry i:nth-child(3) { top: 10%; left: 50%; width: 2px; height: 80%; background: #0d2d23; }
.plate--agri .plate-geometry i:nth-child(4) { top: 78%; left: 14%; width: 72%; height: 1px; background: #722914; }
.plate--agri .plate-geometry i:nth-child(5) { top: 84%; left: 24%; width: 52%; height: 1px; background: #722914; }

/* Softs: horizontal bands and one small circle */
.plate--softs .plate-geometry i:nth-child(1) { top: 24%; left: 10%; width: 80%; height: 10%; border: 2px solid #0d2d23; background: repeating-linear-gradient(90deg, transparent 0 5px, #0d2d23 5px 6px); }
.plate--softs .plate-geometry i:nth-child(2) { top: 44%; left: 10%; width: 80%; height: 10%; border: 2px solid #722914; }
.plate--softs .plate-geometry i:nth-child(3) { top: 64%; left: 10%; width: 80%; height: 10%; border: 2px solid #0d2d23; background: repeating-linear-gradient(90deg, transparent 0 5px, #0d2d23 5px 6px); }
.plate--softs .plate-geometry i:nth-child(4) { top: 40%; left: 70%; width: 12%; aspect-ratio: 1; border-radius: 50%; background: #722914; }
.plate--softs .plate-geometry i:nth-child(5) { top: 12%; left: 50%; width: 1px; height: 76%; background: #0d2d23; }

/* per-plate variation so no two plates in a chapter are identical */
.plate--v2 .plate-geometry { background: repeating-linear-gradient(-17deg, transparent 0 17px, rgb(255 253 246 / 45%) 18px 19px), linear-gradient(200deg, #e0d5c0, #b4b8a3 55%, #d5c3a8); }
.plate--v3 .plate-geometry { background: repeating-linear-gradient(35deg, transparent 0 15px, rgb(255 253 246 / 45%) 16px 17px), linear-gradient(120deg, #dfd2b6, #bcbfa9 50%, #d8b997); }
.plate--v4 .plate-geometry { background: repeating-linear-gradient(-35deg, transparent 0 15px, rgb(255 253 246 / 45%) 16px 17px), linear-gradient(160deg, #e5dbc4, #b6b9a2 60%, #ddc7ab); }
.plate--v2 .plate-geometry i:nth-child(1) { transform: rotate(8deg); }
.plate--v3 .plate-geometry i:nth-child(1) { transform: rotate(-6deg); }
.plate--v4 .plate-geometry i:nth-child(2) { transform: rotate(12deg); }
.plate--agri.plate--v2 .plate-geometry i:nth-child(1),
.plate--agri.plate--v3 .plate-geometry i:nth-child(1) { transform: rotate(45deg); }

.plate figcaption {
  margin-top: 0.75rem;
  color: var(--ink-soft);
  font-size: 0.875rem;
  line-height: 1.5;
}

/* notes column: numbered, ruled note rows with marginal labels */
.notes {
  min-width: 0;
}

.item-name {
  margin-bottom: 0.35rem;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.item-category {
  margin-bottom: 0.75rem;
  color: var(--ink);
}

.item-summary {
  margin-bottom: 1rem;
  font-family: var(--serif);
  font-size: 1.1rem;
}

.note {
  padding: 0.75rem 0 0.75rem 1rem;
  border-top: 1px solid var(--rule-soft);
  border-left: 4px solid transparent;
}

.note-label {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--clay-dark);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.item-category .note-label {
  display: inline;
  margin-right: 0.35rem;
}

.note ul,
.note ol {
  padding-left: 1.25rem;
}

.note li {
  margin-bottom: 0.25rem;
}

.price-line {
  font-size: 1rem;
  color: var(--ink);
}

.price-value {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink);
}

.sources li {
  margin-bottom: 0.4rem;
}

/* layer emphasis (emphasis only, nothing hidden or dimmed) */
main[data-layer="need"] .note[data-layer="need"],
main[data-layer="clarify"] .note[data-layer="clarify"],
main[data-layer="next"] .note[data-layer="next"] {
  border-left-color: var(--clay);
  background: var(--paper-light);
}

/* closing leaves */
.next-step,
.limits {
  padding-block: 2.5rem;
  border-top: 1px solid var(--rule);
}

.next-step h2,
.limits h2 {
  margin-bottom: 0.75rem;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.next-step-copy,
.limits-copy {
  max-width: 64ch;
  font-family: var(--serif);
  font-size: 1.15rem;
}

.limits-copy {
  padding-left: 1rem;
  border-left: 4px solid var(--clay);
}

.site-footer {
  padding: 1.5rem 1rem 2rem;
  border-top: 1px solid var(--rule);
  background: var(--paper-light);
  color: var(--ink);
  text-align: center;
}

.footer-back {
  margin-top: 0.5rem;
}

.footer-back a {
  display: inline-block;
  min-height: 44px;
  padding: 0.6rem 0.25rem;
}

/* desktop: spine rail + alternating plate/notes */
@media (min-width: 64rem) {
  .book {
    display: grid;
    grid-template-columns: 17rem minmax(0, 1fr);
    gap: 2.5rem;
    align-items: start;
  }

  .spine {
    position: sticky;
    top: 1rem;
    max-height: calc(100vh - 2rem);
    margin-bottom: 0;
    overflow-y: auto;
  }

  .layer-inspector {
    grid-template-columns: minmax(14rem, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }

  .layer-inspector .inspector-lead {
    grid-row: 1 / span 2;
  }

  .item {
    grid-template-columns: minmax(0, 0.42fr) minmax(0, 0.58fr);
    gap: 2.5rem;
    align-items: start;
  }

  .item .plate {
    position: sticky;
    top: 1rem;
    grid-row: 1;
  }

  .item.plate-left .plate {
    grid-column: 1;
    transform: rotate(-0.6deg);
  }

  .item.plate-left .notes {
    grid-column: 2;
    grid-row: 1;
  }

  .item.plate-right .plate {
    grid-column: 2;
    transform: rotate(0.6deg);
  }

  .item.plate-right .notes {
    grid-column: 1;
    grid-row: 1;
  }
}

@media (min-width: 90rem) {
  .item {
    grid-template-columns: minmax(0, 0.38fr) minmax(0, 0.62fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0s;
    animation-duration: 0s;
  }
}

@media (forced-colors: active) {
  .layer-controls button[aria-pressed="true"] {
    outline: 3px solid CanvasText;
  }

  main[data-layer] .note[data-layer] {
    border-left-color: transparent;
  }

  main[data-layer="need"] .note[data-layer="need"],
  main[data-layer="clarify"] .note[data-layer="clarify"],
  main[data-layer="next"] .note[data-layer="next"] {
    border-left-color: Highlight;
  }
}