/*
 * The components of the perf pages: a printed tech-order page (TOLD.md 10.1). Colours come only from tokens.css.
 * components.html shows every class below.
 *
 * Page         .page (the fixed 1280 px paper), .page-header, .page-title, .page-footer, .columns (two columns),
 *              .section, .told-section (the full-width TOLD section, wider gap)
 * Text         .section-heading (small caps, Roman numeral), .derived (grey values worked out from the inputs),
 *              .notes (numbered notes, Limitations page)
 * Inputs       .fields (grid of inputs), .field (label and underlined input), .unparsed (an input that does not
 *              parse: grey dotted underline)
 * Tables       .data-table, .drag-index (the 16 px drag index table), .table-title (Takeoff, Landing),
 *              .column-group (MIL, MAX AB), .column-kinds (the exact / cons. row), .num (a right-aligned number),
 *              .exact, .cons (conservative, bold), .subheading (italic row), .group-start (rule above a group),
 *              .total (ink rule, bold), .no-value (a grey dash), .alert (a problem with a cited rule),
 *              .reason (grey reason line under a table)
 * Figure       .figure (page image with the path over it), .figure-image, .figure-overlay, .path-mil (solid),
 *              .path-max-ab (dashed), .figure-letter (circled letter), .figure-legend, .figure-key
 * Links        .figure-link (a figure reference), .subpage-link (Limitations, back to the TOLD page)
 */

html {
  background: var(--paper);
  color: var(--ink);
  font-family: 'Times New Roman', Times, 'Liberation Serif', serif;
  font-size: 17px;
  line-height: 1.4;
  font-variant-numeric: tabular-nums;
}

body {
  margin: 0;
}

a {
  color: inherit;
}

a:hover {
  opacity: 0.7;
}

/* Page. The width is fixed; scaling the page to the window is the page script's job (step 1). It must scale through
   a class or a custom property that print.css can reset, never an inline style: an inline transform or zoom would
   override the print scale. */

.page {
  box-sizing: border-box;
  width: 1280px;
  margin: 0 auto;
  padding: 56px 80px;
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.page-header,
.page-footer {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 24px;
  font-size: 14px;
}

.page-header {
  border-bottom: 1px solid var(--ink);
  padding-bottom: 6px;
}

.page-footer {
  margin-top: auto;
  border-top: 1px solid var(--ink);
  padding-top: 6px;
}

.page-title {
  margin: 0;
  text-align: center;
  font-size: 30px;
  font-weight: bold;
  font-variant: small-caps;
  letter-spacing: 0.04em;
}

.columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 56px;
  align-items: start;
}

.section {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.told-section {
  gap: 14px;
}

/* Text */

.section-heading {
  margin: 0;
  font-size: 18px;
  font-weight: bold;
  font-variant: small-caps;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 3px;
}

.derived {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 15px;
  color: var(--grey);
}

.notes {
  line-height: 1.5;
}

.notes p {
  margin: 0;
}

/* Inputs: bold value, right-aligned, 1 px underline, no box. */

.fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.field input {
  box-sizing: border-box;
  width: 100%;
  padding: 2px 0;
  border: 0;
  border-bottom: 1px solid currentColor;
  border-radius: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  font-weight: bold;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.field input::placeholder {
  color: var(--grey);
  font-weight: normal;
  opacity: 1;
}

.field input:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 2px;
}

.field input.unparsed {
  border-bottom: 1px dotted var(--grey);
}

/* Tables */

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

.data-table th,
.data-table td {
  padding: 6px 8px;
  text-align: left;
  vertical-align: baseline;
}

.data-table .num {
  text-align: right;
}

.data-table thead tr:last-child {
  border-bottom: 1px solid var(--ink);
}

.data-table.drag-index {
  margin-top: 6px;
  font-size: 16px;
}

.data-table .table-title {
  font-size: 18px;
  font-variant: small-caps;
  letter-spacing: 0.05em;
}

.data-table .column-group {
  text-align: right;
  border-bottom: 1px solid var(--ink);
}

.data-table .column-kinds {
  font-size: 14px;
  color: var(--grey);
}

.data-table .exact {
  font-weight: normal;
}

.data-table .cons {
  font-weight: bold;
}

.data-table .subheading td {
  padding-top: 8px;
  font-style: italic;
}

.data-table .group-start {
  border-top: 1px solid var(--rule);
}

.data-table .total {
  border-top: 1px solid var(--ink);
  font-weight: bold;
}

.no-value {
  color: var(--grey);
}

.reason {
  margin: 4px 0 0;
  font-size: 14px;
  color: var(--grey);
}

/* A problem value: a cell that breaks a cited rule. */
.alert {
  color: var(--alert);
}

/* Figure view: the committed page image with the computed path over it. The overlay's viewBox is in PDF points,
   so the stroke widths and the letter size below are PDF points too. */

.figure {
  position: relative;
}

.figure-image {
  display: block;
  width: 100%;
  height: auto;
}

@media screen and (prefers-color-scheme: dark) {
  .figure-image {
    filter: invert(1);
  }
}

.figure-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.path-mil,
.path-max-ab {
  fill: none;
  stroke: var(--ink);
}

.path-mil {
  stroke-width: 1.8;
}

.path-max-ab {
  stroke-width: 1.6;
  stroke-dasharray: 5 3;
}

/* A circled letter: <g class="figure-letter"><circle r="5"/><text/></g>. */
.figure-letter circle {
  fill: var(--paper);
  stroke: var(--ink);
  stroke-width: 0.7;
}

.figure-letter text {
  fill: var(--ink);
  font-size: 8px;
  text-anchor: middle;
}

.figure-legend {
  display: flex;
  gap: 28px;
  align-items: center;
  font-size: 15px;
}

.figure-legend span {
  display: flex;
  gap: 8px;
  align-items: center;
}

.figure-legend line {
  stroke-width: 2;
}

.figure-key {
  width: 440px;
  border-collapse: collapse;
  font-size: 15px;
  font-variant-numeric: tabular-nums;
}

.figure-key td {
  padding: 2px 0;
}

.figure-key .num {
  text-align: right;
}

.figure-key .num + td {
  padding-left: 22px;
}

.figure-key .total {
  border-top: 1px solid var(--ink);
  font-weight: bold;
}

.figure-key .total td {
  padding-top: 3px;
}

/* Links */

.figure-link {
  color: var(--grey);
}