/* Kerf playground.
   The palette is graphite with a brass accent, and the semantic colours for
   added and removed material are kept separate from the accent so they never
   compete for the same meaning. */

:root {
  --ground: #f2f4f0;
  --surface: #ffffff;
  --surface-2: #e9ece7;
  --ink: #141a17;
  --ink-2: #47524c;
  --muted: #6f7b74;
  --rule: #d5dbd4;
  --rule-strong: #b6bfb8;
  --accent: #8f6318;
  --accent-soft: #f0e2c6;
  --added: #1c7f59;
  --added-soft: #d9ece3;
  --removed: #b73f2f;
  --removed-soft: #f3ded9;
  --display: "Saira Condensed", "Arial Narrow", sans-serif;
  --body: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --shadow: 0 1px 2px rgba(20, 26, 23, .06), 0 10px 28px -22px rgba(20, 26, 23, .55);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground: #101311;
    --surface: #181c19;
    --surface-2: #1f2521;
    --ink: #e8ede9;
    --ink-2: #b3bdb6;
    --muted: #8b968e;
    --rule: #2b332d;
    --rule-strong: #3c453e;
    --accent: #d7a94f;
    --accent-soft: #362c17;
    --added: #45bd8c;
    --added-soft: #17342a;
    --removed: #e0705a;
    --removed-soft: #3a221d;
    --shadow: 0 1px 2px rgba(0, 0, 0, .5), 0 14px 34px -26px rgba(0, 0, 0, .9);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--body);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--display); margin: 0; text-wrap: balance; }
h2 { font-size: 20px; font-weight: 600; }
h3 {
  font-size: 12px; font-weight: 600; text-transform: uppercase;
  letter-spacing: .14em; color: var(--muted);
}
p { margin: 0; }
a { color: var(--accent); }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* masthead ---------------------------------------------------------- */
.masthead {
  border-bottom: 1px solid var(--rule-strong);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 10;
}
.masthead-inner {
  max-width: 1320px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { color: var(--accent); flex: none; }
.brand-name {
  font-family: var(--display); font-size: 22px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .06em; line-height: 1;
}
.brand-line { font-size: 12.5px; color: var(--muted); }
.masthead-links {
  display: flex; gap: 18px; font-family: var(--display); font-size: 12px;
  text-transform: uppercase; letter-spacing: .13em;
}
.tabs {
  max-width: 1320px; margin: 0 auto; padding: 0 24px;
  display: flex; gap: 2px; flex-wrap: wrap;
}
.tabs button {
  font-family: var(--display); font-size: 12.5px; text-transform: uppercase;
  letter-spacing: .13em; padding: 9px 16px; border: 1px solid var(--rule);
  border-bottom: 0; background: transparent; color: var(--muted);
  cursor: pointer; border-radius: 2px 2px 0 0;
}
.tabs button[aria-selected="true"] {
  background: var(--ground); color: var(--ink); border-color: var(--rule-strong);
  box-shadow: inset 0 2px 0 var(--accent);
}

/* layout ------------------------------------------------------------ */
main { max-width: 1320px; margin: 0 auto; padding: 22px 24px 60px; }
.intro { color: var(--ink-2); max-width: 72ch; margin-bottom: 20px; font-size: 14.5px; }
.panel {
  display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(340px, 0.95fr);
  gap: 20px; align-items: start;
}
@media (max-width: 1000px) { .panel { grid-template-columns: 1fr; } }
/* A display value on the class outranks the hidden attribute, so say it here. */
.panel[hidden] { display: none; }

.stage {
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  border: 1px solid var(--rule-strong); box-shadow: var(--shadow);
  display: flex; flex-direction: column; position: sticky; top: 118px;
}
@media (max-width: 1000px) { .stage { position: static; } }
.viewer-slot { flex: 1; min-height: 460px; display: flex; }
.viewer-slot canvas {
  flex: 1; width: 100%; min-height: 460px; display: block;
  cursor: grab; touch-action: none;
}
.viewer-slot canvas.grabbing { cursor: grabbing; }
.stage-bar {
  display: flex; justify-content: space-between; align-items: center; gap: 10px;
  padding: 8px 12px; border-top: 1px solid var(--rule); flex-wrap: wrap;
}
.modes { display: flex; gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.modes button, .ghost-btn {
  font-family: var(--display); font-size: 11px; text-transform: uppercase;
  letter-spacing: .12em; padding: 6px 11px; border: 0;
  background: var(--surface); color: var(--muted); cursor: pointer;
}
.modes button[aria-pressed="true"] { background: var(--accent); color: var(--surface); }
@media (prefers-color-scheme: dark) {
  .modes button[aria-pressed="true"] { color: #14170f; }
}
.ghost-btn { border: 1px solid var(--rule); }
.modes button:hover, .ghost-btn:hover { color: var(--ink); }
.hint { font-family: var(--mono); font-size: 11px; color: var(--muted); padding: 0 12px 10px; }

.side { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.block {
  background: var(--surface); border: 1px solid var(--rule-strong);
  padding: 16px 18px; display: flex; flex-direction: column; gap: 12px;
  box-shadow: var(--shadow);
}
.block-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.badge {
  font-family: var(--display); font-size: 10.5px; text-transform: uppercase;
  letter-spacing: .13em; padding: 3px 8px; border: 1px solid var(--rule-strong);
  color: var(--muted); white-space: nowrap;
}
.badge.is-changed { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.badge.is-clean { color: var(--added); border-color: var(--added); background: var(--added-soft); }
.badge.is-conflict { color: var(--removed); border-color: var(--removed); background: var(--removed-soft); }
.summary { font-size: 13.5px; color: var(--ink-2); }
.note-line { font-size: 12px; color: var(--muted); }

/* form pieces -------------------------------------------------------- */
.field { display: flex; flex-direction: column; gap: 5px; font-size: 12px; color: var(--muted); }
.field span { font-family: var(--display); text-transform: uppercase; letter-spacing: .13em; }
select, input[type="number"] {
  font-family: var(--mono); font-size: 13px; padding: 6px 8px;
  border: 1px solid var(--rule-strong); background: var(--surface); color: var(--ink);
}
.check { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--ink-2); }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }
.actions button {
  font-family: var(--display); font-size: 12px; text-transform: uppercase;
  letter-spacing: .12em; padding: 8px 14px; border: 1px solid var(--rule-strong);
  background: var(--surface); color: var(--ink); cursor: pointer;
}
.actions button.primary { background: var(--accent); border-color: var(--accent); color: var(--surface); }
@media (prefers-color-scheme: dark) {
  .actions button.primary { color: #14170f; }
}
.actions button:disabled { opacity: .45; cursor: default; }
button:focus-visible, select:focus-visible, input:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}

.control { display: grid; grid-template-columns: 92px 1fr 74px; gap: 8px; align-items: center; }
.control-label { font-family: var(--mono); font-size: 12px; color: var(--ink-2); overflow-wrap: anywhere; }
.control-range { width: 100%; accent-color: var(--accent); }
.control-number { width: 100%; }
.control-expression { grid-column: 2 / span 2; font-size: 12px; color: var(--muted); }

.feature-row {
  display: grid; grid-template-columns: auto 1fr auto; gap: 8px;
  align-items: center; padding: 4px 0; border-bottom: 1px solid var(--rule);
}
.feature-row:last-child { border-bottom: 0; }
.feature-row.is-off .feature-label { color: var(--muted); text-decoration: line-through; }
.feature-label { font-size: 13px; }
.feature-kind { font-size: 11px; color: var(--muted); }
input[type="checkbox"] { accent-color: var(--accent); }

/* equations ---------------------------------------------------------- */
.equation-row {
  display: grid; grid-template-columns: 96px 1fr 62px; gap: 8px 10px;
  align-items: center; padding: 6px 0; border-bottom: 1px solid var(--rule);
}
.equation-row:last-child { border-bottom: 0; }
.equation-name { font-size: 12.5px; color: var(--ink-2); overflow-wrap: anywhere; }
.equation-input {
  font-family: var(--mono); font-size: 12.5px; padding: 5px 7px; width: 100%;
  border: 1px solid var(--rule-strong); background: var(--surface); color: var(--ink);
}
.equation-input.is-broken { border-color: var(--removed); color: var(--removed); }
.equation-value { font-size: 12.5px; color: var(--muted); text-align: right; }
.equation-drives {
  grid-column: 2 / span 2; font-size: 11.5px; color: var(--muted); margin-top: -2px;
}
.issue {
  display: flex; gap: 8px; flex-wrap: wrap; padding: 7px 10px; margin-top: 6px;
  border-left: 3px solid var(--removed); background: var(--removed-soft);
}
.issue-warning { border-left-color: var(--accent); background: var(--accent-soft); }
.issue-where { font-size: 12px; color: var(--ink); }
.issue-message { font-size: 12.5px; color: var(--ink-2); }
.ok-note { font-size: 12.5px; color: var(--added); }

.sweep-controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: flex-end; }
.sweep-controls .field { flex: 1 1 104px; min-width: 0; }
.sweep-controls button {
  flex: 0 0 auto; padding: 7px 16px; font-family: var(--display); font-size: 12px;
  text-transform: uppercase; letter-spacing: .12em; border: 1px solid var(--accent);
  background: var(--accent); color: var(--surface); cursor: pointer;
}
@media (prefers-color-scheme: dark) { .sweep-controls button { color: #14170f; } }
#sweep-chart { overflow-x: auto; }
.chart { width: 100%; height: auto; display: block; }
.chart-axis { stroke: var(--rule-strong); stroke-width: 1; }
.chart-bar { fill: var(--muted); opacity: .75; }
.chart-bar.is-warn { fill: var(--accent); opacity: .9; }
.chart-bar.is-fail { fill: var(--removed); opacity: .55; }
.chart-fail-mark { fill: var(--removed); font-size: 13px; font-family: var(--mono); }
.chart-label { fill: var(--muted); font-size: 10px; font-family: var(--mono); }
.chart-hit { fill: transparent; cursor: crosshair; }
.chart-hit:hover ~ .chart-bar, .chart-hit:focus { outline: none; }
.sweep-note { font-size: 12.5px; color: var(--muted); }
.sweep-note.is-good { color: var(--added); }
.sweep-note.is-warn { color: var(--accent); }
.sweep-note.is-bad { color: var(--removed); }

/* diff readout ------------------------------------------------------- */
.block-diff { gap: 14px; }
#diff-body, #merge-body, #reexport-body {
  display: flex; flex-direction: column; gap: 18px;
}
.readout { display: flex; flex-direction: column; gap: 6px; }
.readout h3 { margin-bottom: 2px; }
.line { display: flex; gap: 8px; align-items: baseline; font-size: 13px; flex-wrap: wrap; }
.line .key { font-family: var(--mono); color: var(--ink); }
.line .change { font-family: var(--mono); color: var(--ink-2); }
.chip { font-family: var(--mono); font-size: 11px; padding: 1px 6px; border-radius: 2px; }
.chip-up { background: var(--added-soft); color: var(--added); }
.chip-down { background: var(--removed-soft); color: var(--removed); }
.chip-new { background: var(--added-soft); color: var(--added); }
.chip-gone { background: var(--removed-soft); color: var(--removed); }
.impact { font-size: 11.5px; color: var(--muted); padding-left: 2px; }
.feat {
  display: grid; grid-template-columns: 3px 1fr; gap: 10px;
  padding: 7px 0; border-bottom: 1px solid var(--rule);
}
.feat:last-child { border-bottom: 0; }
.feat-mark { background: var(--rule-strong); border-radius: 2px; }
.feat-added .feat-mark { background: var(--added); }
.feat-removed .feat-mark { background: var(--removed); }
.feat-modified .feat-mark { background: var(--accent); }
.feat-name { font-weight: 600; font-size: 13.5px; }
.feat-status {
  font-family: var(--display); font-size: 10px; text-transform: uppercase;
  letter-spacing: .13em; color: var(--muted); margin-left: 6px;
}
.feat-added .feat-status { color: var(--added); }
.feat-removed .feat-status { color: var(--removed); }
.feat-modified .feat-status { color: var(--accent); }
.feat-fields { font-family: var(--mono); font-size: 12px; color: var(--ink-2); }

.vbar { display: flex; height: 10px; background: var(--surface-2); border: 1px solid var(--rule); overflow: hidden; }
.vbar span { display: block; height: 100%; }
.vbar-kept { background: var(--muted); opacity: .55; }
.vbar-add { background: var(--added); }
.vbar-rem { background: var(--removed); }
.vbar-key { font-size: 12px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 4px 14px; }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 5px; }
.dot-kept { background: var(--muted); opacity: .55; }
.dot-added { background: var(--added); }
.dot-removed { background: var(--removed); }

table.readout-table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.readout-table th {
  text-align: left; font-weight: 500; color: var(--ink-2); padding: 5px 10px 5px 0;
  border-bottom: 1px solid var(--rule); white-space: nowrap;
}
.readout-table td {
  text-align: right; padding: 5px 0 5px 10px; border-bottom: 1px solid var(--rule);
  font-family: var(--mono); white-space: nowrap;
}
.readout-table tr:last-child th, .readout-table tr:last-child td { border-bottom: 0; }

.verdict { border-left: 3px solid var(--rule-strong); padding: 8px 0 8px 12px; display: flex; flex-direction: column; gap: 3px; }
.verdict-git { border-color: var(--removed); }
.verdict-kerf { border-color: var(--added); }
.verdict h4 { margin: 0; font-family: var(--display); font-size: 12px; text-transform: uppercase; letter-spacing: .13em; }
.verdict p { font-size: 13px; color: var(--ink-2); }
.verdict .figure { font-family: var(--mono); font-size: 18px; }

.conflict {
  border-left: 3px solid var(--removed); background: var(--removed-soft);
  padding: 10px 12px; display: flex; flex-direction: column; gap: 3px;
}
.conflict-key { font-family: var(--mono); font-size: 12px; color: var(--removed); }
.conflict-detail { font-size: 13px; color: var(--ink); }
.note-item { font-size: 12.5px; color: var(--ink-2); }
.note-item::before { content: "· "; color: var(--muted); }
.empty-note { font-size: 13px; color: var(--muted); }
.fineprint { font-size: 11.5px; color: var(--muted); }

.page-foot {
  max-width: 1320px; margin: 0 auto; padding: 16px 24px 40px;
  border-top: 1px solid var(--rule); display: flex; justify-content: space-between;
  gap: 16px; flex-wrap: wrap; font-size: 11.5px; color: var(--muted);
  font-family: var(--display); text-transform: uppercase; letter-spacing: .12em;
}
.noscript { padding: 24px; color: var(--removed); }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}