/* style.css — Element Projections
 *
 * Skin: printed wall chart. Warm paper, ink hairlines, flat pigment fills,
 * Franklin-ish sans for data and a transitional serif for the masthead — the
 * look of a classroom periodic table poster.
 *
 * The skin is doing argumentative work, not decoration. The piece's claim is
 * that the standard table is one arrangement among many; making the baseline
 * look like the canonical printed chart is what gives the other nine layouts
 * something to visibly depart from. Everything that is not the chart — controls,
 * diagnostics, inspector — is styled as printed apparatus around it: a key box,
 * a caption, a legend.
 */

:root {
  /* Paper and ink */
  --page: #e7e0cd;          /* the surface the sheet sits on */
  --paper: #f6f2e6;         /* the chart itself */
  --paper-cell: #fffdf6;    /* an element cell before its pigment */
  --paper-sunk: #efe9d9;    /* recessed areas: toolbar, footer */

  --ink: #1a1714;
  --ink-soft: #554f45;
  --ink-faint: #6b6355;         /* darkened from #857d6f: the lighter value fell
                                   below 4.5:1 on paper at 10–11px */
  --rule: #2b2721;                       /* hairline between cells */
  --rule-soft: rgba(26, 23, 20, 0.22);
  --rule-hair: rgba(26, 23, 20, 0.13);

  /* One accent, the annotation red of a printed chart */
  --mark: #a3322a;
  --mark-soft: rgba(163, 50, 42, 0.1);
  --mark-edge: rgba(163, 50, 42, 0.42);

  --font-display: 'Libre Baskerville', Georgia, 'Times New Roman', serif;
  --font-sans: 'Libre Franklin', 'Franklin Gothic Medium', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', Courier, monospace;

  --shadow-sheet: 0 1px 2px rgba(26, 23, 20, 0.09), 0 8px 24px rgba(26, 23, 20, 0.07);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--page);
  /* faint laid-paper tooth; no image, so it stays crisp at any zoom */
  background-image:
    repeating-linear-gradient(90deg, rgba(26, 23, 20, 0.016) 0 1px, transparent 1px 3px);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ==================== Masthead — the chart's printed title block ========== */

.masthead {
  background-color: var(--paper);
  border-bottom: 2px solid var(--rule);
  box-shadow: 0 1px 0 var(--paper), 0 2px 0 var(--rule-soft);
  padding: 22px 30px 18px;
}

.masthead-content {
  max-width: 1700px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px 24px;
}

.masthead-brand {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
}

.masthead-brand h1 {
  font-family: var(--font-display);
  font-size: 25px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.masthead-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--mark);
  background: var(--mark-soft);
  padding: 3px 9px;
  border: 1px solid var(--mark-edge);
}

.standfirst {
  flex: 1 1 480px;
  font-size: 13px;
  color: var(--ink-soft);
  max-width: 880px;
  line-height: 1.55;
}

.standfirst strong { color: var(--ink); }

/* ==================== Buttons ==================== */

.btn {
  font-family: var(--font-sans);
  font-size: 12.5px;
  font-weight: 500;
  padding: 6px 13px;
  border-radius: 0;                       /* printed rules do not have radii */
  border: 1px solid var(--rule-soft);
  background: var(--paper-cell);
  color: var(--ink);
  cursor: pointer;
  transition: background-color 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}

.btn:hover {
  background: #fff;
  border-color: var(--rule);
}

.btn:focus-visible {
  outline: 2px solid var(--mark);
  outline-offset: 1px;
}

.btn-primary {
  background: var(--mark-soft);
  border-color: var(--mark-edge);
  color: var(--mark);
  font-weight: 600;
}

.btn-primary:hover {
  background: rgba(163, 50, 42, 0.16);
  border-color: var(--mark);
}

/* ==================== Main Layout ==================== */

.app-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 20px;
  max-width: 1700px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 30px 34px;
  align-items: start;
}

@media (max-width: 1180px) {
  .app-layout { grid-template-columns: minmax(0, 1fr); }
}

.workspace-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

/* ==================== Controls — styled as a printed key box ============== */

.controls-toolbar {
  background: var(--paper);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow-sheet);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.control-label,
.subgroup-label {
  display: block;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 8px;
}

.subgroup-label { margin-bottom: 0; margin-right: 2px; }

.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border: 1px solid var(--rule);
  background: var(--rule);                 /* the rule shows through as gaps */
  gap: 1px;
}

.projection-select { display: none; }

.btn-preset {
  flex: 1 1 auto;
  font-size: 12px;
  font-weight: 500;
  padding: 7px 12px;
  border: none;
  border-radius: 0;
  background: var(--paper-cell);
  color: var(--ink-soft);
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.12s ease, color 0.12s ease;
}

.btn-preset:hover { background: #fff; color: var(--ink); }

.btn-preset.active {
  background: var(--ink);
  color: var(--paper);
  font-weight: 600;
}

.control-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
  padding-top: 12px;
  border-top: 1px solid var(--rule-hair);
}

.control-subgroup {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  color: var(--ink-faint);
}

.control-subgroup > label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.select-control {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
  padding: 5px 8px;
  border: 1px solid var(--rule-soft);
  border-radius: 0;
  background: var(--paper-cell);
  color: var(--ink);
  cursor: pointer;
  max-width: 260px;
}

.select-control:hover { border-color: var(--rule); }
.select-control:focus { outline: 2px solid var(--mark); outline-offset: 1px; }

.btn-group-toggle {
  display: flex;
  border: 1px solid var(--rule);
  background: var(--rule);
  gap: 1px;
}

.btn-toggle {
  font-size: 12px;
  padding: 5px 12px;
  border: none;
  border-radius: 0;
  background: var(--paper-cell);
  color: var(--ink-soft);
}

.btn-toggle:hover { background: #fff; color: var(--ink); }

.btn-toggle.active {
  background: var(--ink);
  color: var(--paper);
  font-weight: 600;
}

.toggle-options { gap: 14px; }

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--ink-soft);
  cursor: pointer;
  text-transform: none;
  letter-spacing: 0;
}

.checkbox-label input { accent-color: var(--mark); cursor: pointer; }

/* ==================== The chart sheet ==================== */

.stage-wrapper {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow-sheet);
  padding: 18px;
  min-height: 480px;
  display: flex;
  flex-direction: column;
}

.stage-scroll {
  width: 100%;
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior-x: contain;
  scrollbar-color: var(--rule-soft) var(--paper-sunk);
  scrollbar-width: thin;
  touch-action: pan-x pan-y;
}

.stage-scroll:focus-visible {
  outline: 2px solid var(--mark);
  outline-offset: 3px;
}

#stage-container {
  position: relative;
  width: 100%;
  min-height: 440px;
}

.stage-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.stage-tiles {
  position: absolute;
  inset: 0;
}

/* ==================== Element cells ==================== */

.element-tile {
  position: absolute;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: var(--paper-cell);
  border: 1px solid var(--rule);
  border-radius: 0;
  color: var(--ink);
  cursor: pointer;
  overflow: hidden;
  padding: 2px;
  /* the category pigment arrives inline as background-color; the swatch bar
     below carries the same hue at full strength, the way a legend key does */
  box-shadow: inset 0 0 0 0 transparent;
  transition: box-shadow 0.12s ease, opacity 0.2s ease;
  will-change: transform;
}

.element-tile::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--tile-edge, transparent);
}

.element-tile:hover {
  box-shadow: inset 0 0 0 2px var(--ink);
  z-index: 30;
}

.element-tile:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--mark);
  z-index: 31;
}

.element-tile.selected {
  box-shadow: inset 0 0 0 2px var(--mark);
  z-index: 32;
}

.tile-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  width: 100%;
  padding: 0 3px;
  font-family: var(--font-mono);
  font-size: 8.5px;
  line-height: 1;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}

.tile-mass { font-size: 7.5px; color: var(--ink-faint); }

.tile-symbol {
  font-family: var(--font-sans);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.tile-name {
  font-size: 6.5px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-align: center;
  width: 100%;
  padding: 0 1px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.element-tile.compact .tile-header { font-size: 7px; }
.element-tile.compact .tile-mass { display: none; }
.element-tile.compact .tile-symbol { font-size: 13px; }
.element-tile.compact .tile-name { display: none; }

.point-layout .element-tile {
  padding: 0;
  border-color: var(--tile-edge, var(--rule));
}

.point-layout .element-tile::after,
.point-layout .tile-header,
.point-layout .tile-name { display: none; }

.point-layout .tile-symbol {
  font-family: var(--font-mono);
  font-size: 7px;
  line-height: 1;
}

.point-layout .element-tile:hover,
.point-layout .element-tile:focus-visible,
.point-layout .element-tile.selected {
  box-shadow: 0 0 0 3px var(--paper), 0 0 0 5px var(--mark);
}

.stage-footer {
  padding-top: 12px;
  margin-top: 12px;
  border-top: 1px solid var(--rule-hair);
}

.hover-hint {
  font-size: 11.5px;
  font-style: italic;
  color: var(--ink-faint);
}

.stage-scroll-note {
  display: none;
  margin-top: 3px;
  font-size: 10px;
  color: var(--ink-faint);
}

/* ==================== Diagnostics — the chart's caption ================== */

.diagnostics-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 0;
  background: var(--paper);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow-sheet);
}

@media (max-width: 820px) {
  .diagnostics-panel { grid-template-columns: minmax(0, 1fr); }
}

.diag-column { padding: 16px 18px; min-width: 0; }

.main-diag { border-right: 1px solid var(--rule-hair); }

@media (max-width: 820px) {
  .main-diag { border-right: none; border-bottom: 1px solid var(--rule-hair); }
}

.diag-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
}

.diag-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  padding: 9px 0;
  border-top: 1px solid var(--rule-hair);
  border-bottom: 1px solid var(--rule-hair);
  margin-bottom: 10px;
}

.meta-item { display: flex; align-items: baseline; gap: 7px; min-width: 0; }

.meta-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  white-space: nowrap;
}

.meta-val {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mark);
}

.diag-thesis {
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink);
  margin-bottom: 6px;
}

.diag-desc {
  font-size: 12px;
  line-height: 1.55;
  color: var(--ink-soft);
}

.metrics-diag { background: var(--paper-sunk); }

.metrics-diag h3 {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 12px;
}

.metric-card {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 9px 0;
  border-top: 1px solid var(--rule-hair);
}

.metric-num {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.metric-desc {
  font-size: 10.5px;
  line-height: 1.35;
  color: var(--ink-faint);
}

/* ==================== Inspector — a printed side note ==================== */

.inspector-panel {
  position: sticky;
  top: 20px;
  background: var(--paper);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow-sheet);
  padding: 16px;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
}

.inspector-card { display: flex; flex-direction: column; gap: 14px; }

.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--rule);
}

.card-symbol {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 62px;
  height: 62px;
  flex-shrink: 0;
  background: var(--paper-cell);
  border: 1px solid var(--rule);
}

.card-z {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

.card-sym {
  font-size: 27px;
  font-weight: 700;
  line-height: 1.05;
  color: var(--ink);
}

.card-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.card-tags { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 5px; }

.badge {
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 2px 6px;
  border: 1px solid var(--rule-soft);
  background: var(--paper-sunk);
  color: var(--ink-soft);
}

.residual-badges { display: flex; flex-wrap: wrap; gap: 5px; }

.badge-residual { border-color: var(--mark-edge); background: var(--mark-soft); color: var(--mark); }
.badge-diagonal { border-color: rgba(24, 82, 130, 0.4); background: rgba(24, 82, 130, 0.09); color: #185282; }
.badge-triad    { border-color: rgba(122, 84, 12, 0.4);  background: rgba(122, 84, 12, 0.1);  color: #7a540c; }
.badge-info     { border-color: var(--rule-soft); background: var(--paper-sunk); color: var(--ink-soft); }

.card-section h4 {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 7px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--rule-hair);
}

.prop-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.prop-table tr { border-bottom: 1px solid var(--rule-hair); }
.prop-table td { padding: 5px 0; vertical-align: baseline; }
.prop-table td:first-child { color: var(--ink-faint); padding-right: 10px; }
.prop-table td:last-child {
  text-align: right;
  font-family: var(--font-mono);
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* ==================== Modal ==================== */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(26, 23, 20, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 26px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.16s ease, visibility 0.16s ease;
  z-index: 100;
}

.modal-backdrop.open { opacity: 1; visibility: visible; }

.modal-window {
  background: var(--paper);
  border: 1px solid var(--rule);
  box-shadow: 0 18px 50px rgba(26, 23, 20, 0.35);
  max-width: 800px;
  width: 100%;
  max-height: 86vh;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 22px;
  border-bottom: 2px solid var(--rule);
}

.modal-header h2 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.btn-close {
  font-size: 22px;
  line-height: 1;
  width: 30px;
  height: 30px;
  border: 1px solid var(--rule-soft);
  background: var(--paper-cell);
  color: var(--ink-soft);
  cursor: pointer;
}

.btn-close:hover { background: #fff; color: var(--ink); border-color: var(--rule); }

.modal-body { padding: 20px 22px 26px; overflow-y: auto; }

.modal-section { margin-bottom: 22px; }
.modal-section:last-child { margin-bottom: 0; }

.modal-section h3 {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 9px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--rule-hair);
}

.modal-section p,
.modal-section ul {
  font-size: 13px;
  line-height: 1.62;
  color: var(--ink-soft);
  margin-bottom: 9px;
}

.modal-section strong { color: var(--ink); }
.modal-section em { color: var(--ink); }

.modal-section ul { padding-left: 20px; }
.modal-section li { margin-bottom: 6px; }

/* Inline maths, set as small caps-free italics rather than left as TeX source */
.m { font-family: var(--font-display); font-style: italic; }
.mono { font-family: var(--font-mono); font-style: normal; font-size: 0.94em; }

/* ==================== Scrollbars ==================== */

.inspector-panel::-webkit-scrollbar,
.modal-body::-webkit-scrollbar { width: 9px; }

.inspector-panel::-webkit-scrollbar-track,
.modal-body::-webkit-scrollbar-track { background: var(--paper-sunk); }

.inspector-panel::-webkit-scrollbar-thumb,
.modal-body::-webkit-scrollbar-thumb {
  background: var(--rule-soft);
  border: 2px solid var(--paper-sunk);
}

.inspector-panel::-webkit-scrollbar-thumb:hover { background: var(--ink-faint); }

/* ==================== Small screens ==================== */

@media (max-width: 700px) {
  .masthead { padding: 17px 16px 15px; }
  .masthead-content { gap: 10px; }
  .masthead-brand { display: block; }
  .masthead-brand h1 { font-size: 23px; margin-bottom: 8px; }
  .masthead-tag { display: inline-block; font-size: 10px; }
  .standfirst { flex-basis: 100%; font-size: 12.5px; line-height: 1.5; }
  .masthead-actions { width: 100%; }
  .masthead-actions .btn { width: 100%; min-height: 40px; }

  .app-layout { gap: 14px; padding: 14px 12px 24px; }
  .workspace-panel { gap: 12px; }
  .controls-toolbar { padding: 12px; gap: 12px; }
  .preset-buttons { display: none; }
  .projection-select { display: block; width: 100%; max-width: none; min-height: 42px; }

  .control-row { align-items: stretch; gap: 12px; }
  .control-subgroup { width: 100%; align-items: stretch; }
  .control-subgroup > label { flex: 1 1 100%; align-items: stretch; }
  .control-subgroup .select-control { width: 100%; max-width: none; min-height: 40px; }
  .subgroup-label { width: 100%; margin: 0; }
  .btn-group-toggle { width: 100%; }
  .btn-toggle { flex: 1; min-height: 40px; }
  .toggle-options { flex-direction: column; gap: 8px; }
  .checkbox-label { min-height: 30px; }

  .stage-wrapper { padding: 10px; min-height: 0; }
  .stage-footer { margin-top: 8px; padding-top: 8px; }
  .hover-hint { font-size: 10.5px; }
  .stage-scroll-note { display: block; }

  .diag-column { padding: 14px; }
  .diag-meta-row { display: grid; gap: 8px; }
  .meta-item { display: block; }
  .meta-label { display: block; margin-bottom: 2px; }
  .meta-val { display: block; white-space: normal; }

  .inspector-panel {
    position: static;
    max-height: none;
    padding: 14px;
  }

  .modal-backdrop { padding: 10px; }
  .modal-header { padding: 13px 14px; }
  .modal-body { padding: 16px 14px 20px; }
}

/* ==================== Print ==================== */

@media print {
  body { background: #fff; }
  .controls-toolbar,
  .masthead-actions,
  .inspector-panel,
  .stage-footer,
  .modal-backdrop { display: none; }
  .app-layout { grid-template-columns: 1fr; padding: 0; }
  .stage-wrapper,
  .diagnostics-panel,
  .masthead { box-shadow: none; }
}