/* Linecheck — chart-recorder aesthetic
   paper stock, ruled grid, two ink pens */

:root {
  --paper:      #EDEAE1;
  --paper-lit:  #F5F3EC;
  --rule:       #CFC7B4;
  --rule-soft:  #DCD6C6;
  --ink:        #1A1F1C;
  --ink-soft:   #6B675B;
  --pen-down:   #1E5E52;
  --pen-up:     #A6432B;

  --font-sans: "IBM Plex Sans Condensed", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --measure: 66ch;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.55;
  padding: 0 22px 64px;
}

/* ---------- masthead ---------- */

.masthead {
  display: flex;
  align-items: baseline;
  gap: 14px;
  max-width: 860px;
  margin: 0 auto;
  padding: 26px 0 22px;
  border-bottom: 1px solid var(--ink);
}

.wordmark {
  margin: 0;
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.strapline {
  margin: 0;
  font-size: 15px;
  color: var(--ink-soft);
}

/* ---------- sheet ---------- */

.sheet {
  max-width: 860px;
  margin: 0 auto;
}

/* ---------- readout ---------- */

.readout {
  padding: 30px 0 16px;
}

.readout__phase {
  margin: 0 0 2px;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color 140ms linear;
}

.readout__phase[data-pen="down"] { color: var(--pen-down); }
.readout__phase[data-pen="up"]   { color: var(--pen-up); }

.readout__value {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.readout__number {
  font-family: var(--font-mono);
  font-size: clamp(52px, 13vw, 88px);
  font-weight: 500;
  line-height: 0.94;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.readout__unit {
  font-size: 17px;
  color: var(--ink-soft);
}

/* ---------- chart ---------- */

.chart {
  position: relative;
  height: 268px;
  background: var(--paper-lit);
  border: 1px solid var(--ink);
  border-radius: 2px;
}

.chart canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.chart__caption {
  margin: 9px 0 0;
  font-size: 14px;
  color: var(--ink-soft);
  max-width: var(--measure);
}

/* ---------- controls ---------- */

.controls {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 26px;
}

.start {
  font-family: inherit;
  font-size: 17px;
  font-weight: 600;
  color: var(--paper-lit);
  background: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 2px;
  padding: 11px 30px;
  cursor: pointer;
}

.start:hover { background: #2C332E; }

.start:focus-visible {
  outline: 2px solid var(--pen-up);
  outline-offset: 3px;
}

.start[disabled] {
  background: transparent;
  color: var(--ink-soft);
  border-color: var(--rule);
  cursor: default;
}

.controls__note {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
  flex: 1 1 240px;
}

/* ---------- results ---------- */

.results {
  margin-top: 48px;
  border-top: 1px solid var(--ink);
}

.results__table {
  width: 100%;
  border-collapse: collapse;
}

.results__table th,
.results__table td {
  border-bottom: 1px solid var(--rule);
  padding: 12px 0;
  text-align: left;
  font-weight: 400;
}

.results__table th {
  font-size: 16px;
  font-weight: 500;
  width: 40%;
}

.results__table .num {
  font-family: var(--font-mono);
  font-size: 25px;
  font-variant-numeric: tabular-nums;
  text-align: right;
  padding-right: 12px;
  width: 40%;
}

.results__table .uom {
  font-size: 14px;
  color: var(--ink-soft);
}

.results__table tr:nth-child(1) .num { color: var(--pen-down); }
.results__table tr:nth-child(2) .num { color: var(--pen-up); }

/* ---------- stamp ---------- */

.stamp {
  margin: 20px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 4px 28px;
  font-size: 14px;
}

.stamp div {
  display: flex;
  gap: 8px;
  justify-content: space-between;
  border-bottom: 1px dotted var(--rule-soft);
  padding: 5px 0;
}

.stamp dt { color: var(--ink-soft); }

.stamp dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  text-align: right;
  overflow-wrap: anywhere;
}

/* ---------- notes ---------- */

.notes {
  margin-top: 52px;
  max-width: var(--measure);
}

.notes h2 {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 10px;
}

.notes p {
  margin: 0 0 14px;
  font-size: 16px;
  color: #2E332F;
}

.notes strong { font-weight: 600; }

/* ---------- colophon ---------- */

.colophon {
  max-width: 860px;
  margin: 48px auto 0;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  font-size: 13px;
  color: var(--ink-soft);
}

.colophon p { margin: 0; }

/* ---------- small screens ---------- */

@media (max-width: 620px) {
  body { padding: 0 16px 48px; }
  .chart { height: 210px; }
  .readout { padding-top: 22px; }
  .start { width: 100%; text-align: center; }
  .results__table th { width: 34%; }
}