/*
 * Massing Study — screen styles.
 *
 * The palette is a drafting palette: warm paper, graphite line, one accent for
 * a breach. The canvas colours live here rather than in JavaScript so the dark
 * theme and the print sheet only have to redefine tokens.
 */

:root {
  /* Paper and ink */
  --c-paper: #f6f4ef;
  --c-panel: #fffefb;
  --c-ink: #22262c;
  --c-ink-soft: #5c636e;
  --c-rule: #dcd7cd;
  --c-line: #3b3f46;
  --c-line-soft: #9c968a;

  /* Drawing fills, read by the renderer */
  --c-site: #e9e5dc;
  --c-wall: #cfc9be;
  --c-roof: #f3f0ea;
  --c-shadow: rgba(40, 44, 52, 0.28);

  --c-pass: #2f6b46;
  --c-pass-bg: #e6f0e8;
  --c-fail: #9a3325;
  --c-fail-bg: #f7e7e3;
  --c-focus: #2f5d8c;

  --radius: 6px;
  --gap: 1rem;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --c-paper: #16181c;
    --c-panel: #1d2025;
    --c-ink: #e6e3dc;
    --c-ink-soft: #a3a8b2;
    --c-rule: #32363d;
    --c-line: #cdd2da;
    --c-line-soft: #6d7480;

    --c-site: #272b31;
    --c-wall: #3d434b;
    --c-roof: #565d66;
    --c-shadow: rgba(0, 0, 0, 0.42);

    --c-pass: #7fc79a;
    --c-pass-bg: #1e2b23;
    --c-fail: #e79484;
    --c-fail-bg: #2e1f1c;
    --c-focus: #7fb0e0;
  }
}

/*
 * The print palette, defined once. The canvas is a bitmap, so `@media print`
 * cannot recolour it — the drawing has to be repainted before the print
 * dialog opens. `body.printing` is added on `beforeprint` for exactly that,
 * and the `@media print` mapping is the fallback for a browser that prints
 * without firing the event.
 */
:root {
  --p-paper: #ffffff;
  --p-panel: #ffffff;
  --p-ink: #000000;
  --p-ink-soft: #333333;
  --p-rule: #999999;
  --p-line: #000000;
  --p-line-soft: #777777;
  --p-site: #f0f0f0;
  --p-wall: #d8d8d8;
  --p-roof: #ffffff;
  --p-shadow: rgba(0, 0, 0, 0.18);
  --p-pass: #000000;
  --p-pass-bg: #ffffff;
  --p-fail: #000000;
  --p-fail-bg: #eeeeee;
}

body.printing {
  --c-paper: var(--p-paper);
  --c-panel: var(--p-panel);
  --c-ink: var(--p-ink);
  --c-ink-soft: var(--p-ink-soft);
  --c-rule: var(--p-rule);
  --c-line: var(--p-line);
  --c-line-soft: var(--p-line-soft);
  --c-site: var(--p-site);
  --c-wall: var(--p-wall);
  --c-roof: var(--p-roof);
  --c-shadow: var(--p-shadow);
  --c-pass: var(--p-pass);
  --c-pass-bg: var(--p-pass-bg);
  --c-fail: var(--p-fail);
  --c-fail-bg: var(--p-fail-bg);
}

@media print {
  :root {
    --c-paper: var(--p-paper);
    --c-panel: var(--p-panel);
    --c-ink: var(--p-ink);
    --c-ink-soft: var(--p-ink-soft);
    --c-rule: var(--p-rule);
    --c-line: var(--p-line);
    --c-line-soft: var(--p-line-soft);
    --c-site: var(--p-site);
    --c-wall: var(--p-wall);
    --c-roof: var(--p-roof);
    --c-shadow: var(--p-shadow);
    --c-pass: var(--p-pass);
    --c-pass-bg: var(--p-pass-bg);
    --c-fail: var(--p-fail);
    --c-fail-bg: var(--p-fail-bg);
  }
}

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

body {
  margin: 0;
  padding: 1.25rem clamp(1rem, 3vw, 2rem) 2.5rem;
  background: var(--c-paper);
  color: var(--c-ink);
  font: 400 15px/1.5 var(--font);
  -webkit-text-size-adjust: 100%;
}

h1, h2, h3 { line-height: 1.2; margin: 0; font-weight: 600; }
h1 { font-size: 1.4rem; letter-spacing: -0.01em; }
h3 { font-size: 0.95rem; margin: 1.5rem 0 0.5rem; }
p { margin: 0; }
a { color: var(--c-focus); }

:where(a, button, input, [tabindex]):focus-visible {
  outline: 2px solid var(--c-focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  z-index: 10;
  padding: 0.5rem 0.75rem;
  background: var(--c-panel);
  border: 1px solid var(--c-rule);
  border-radius: var(--radius);
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ---- Masthead ---- */

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--gap);
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--c-rule);
}

.masthead__title p {
  color: var(--c-ink-soft);
  font-size: 0.9rem;
  margin-top: 0.15rem;
}

.masthead__actions { display: flex; gap: 0.5rem; }

.intro {
  max-width: 62ch;
  margin: 0.9rem 0 1.25rem;
  color: var(--c-ink-soft);
  font-size: 0.9rem;
}

/* ---- Layout ---- */

.layout {
  display: grid;
  gap: var(--gap);
  grid-template-columns: minmax(250px, 300px) minmax(0, 1fr) minmax(320px, 470px);
  align-items: start;
}

@media (max-width: 1180px) {
  .layout { grid-template-columns: minmax(260px, 340px) minmax(0, 1fr); }
  .readouts { grid-column: 1 / -1; }
}

@media (max-width: 780px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .readouts { grid-column: auto; }
}

.panel {
  background: var(--c-panel);
  border: 1px solid var(--c-rule);
  border-radius: var(--radius);
  padding: 1rem;
}

.panel__title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-ink-soft);
  margin-bottom: 0.75rem;
}

/* ---- Form ---- */

.controls { display: grid; gap: 1rem; }

fieldset {
  margin: 0;
  padding: 0.75rem 0 0;
  border: 0;
  border-top: 1px solid var(--c-rule);
}
fieldset:first-of-type { border-top: 0; padding-top: 0; }

legend {
  padding: 0;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-ink-soft);
}

.grid {
  display: grid;
  gap: 0.65rem 0.75rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 0.6rem;
}

.field { display: grid; gap: 0.25rem; min-width: 0; }
.field--wide { grid-column: 1 / -1; }

.field--check {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.6rem;
}
.field--check label { font-size: 0.9rem; }

label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--c-ink-soft);
}

.unit {
  font-weight: 400;
  opacity: 0.75;
}

input[type="text"],
input[type="number"] {
  width: 100%;
  min-width: 0;
  padding: 0.4rem 0.5rem;
  font: 400 0.95rem var(--font-mono);
  color: var(--c-ink);
  background: var(--c-paper);
  border: 1px solid var(--c-rule);
  border-radius: 4px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--c-focus);
}

.hint {
  grid-column: 1 / -1;
  margin-top: 0.35rem;
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--c-ink-soft);
}

.button {
  padding: 0.4rem 0.7rem;
  font: 500 0.85rem var(--font);
  color: var(--c-ink);
  background: var(--c-panel);
  border: 1px solid var(--c-rule);
  border-radius: 4px;
  cursor: pointer;
}
.button:hover { border-color: var(--c-line-soft); }
.button:active { transform: translateY(1px); }

@media (prefers-reduced-motion: reduce) {
  .button:active { transform: none; }
}

/* ---- Drawing ---- */

.canvas-frame {
  position: relative;
  aspect-ratio: 4 / 3;
  max-width: 100%;
  background: var(--c-paper);
  border: 1px solid var(--c-rule);
  border-radius: 4px;
  overflow: hidden;
}

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

.warning,
.sun-line {
  margin-top: 0.7rem;
  font-size: 0.85rem;
  color: var(--c-ink-soft);
}

.warning {
  padding: 0.5rem 0.65rem;
  color: var(--c-fail);
  background: var(--c-fail-bg);
  border-radius: 4px;
}

.export-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.9rem;
}

/* ---- Readouts ---- */

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.5rem;
  margin: 0;
}

.metric {
  padding: 0.5rem 0.6rem;
  background: var(--c-paper);
  border: 1px solid var(--c-rule);
  border-radius: 4px;
}

.metric dt {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--c-ink-soft);
}

.metric dd {
  margin: 0.15rem 0 0;
  font: 600 1rem/1.2 var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.table-scroll { overflow-x: auto; }

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

/* Five columns in a side panel: the checks table earns tighter setting. */
.checks { font-size: 0.8rem; }
.checks th,
.checks td { padding: 0.35rem 0.35rem; }

.data-table th,
.data-table td {
  padding: 0.35rem 0.5rem;
  text-align: left;
  border-bottom: 1px solid var(--c-rule);
}

/* Figures must not wrap mid-number; headings and notes may. */
.data-table .numeric,
.data-table .dimension,
.data-table tbody th { white-space: nowrap; }

/* A unit of measure is never capitalised, even inside a small-caps heading. */
.data-table thead .unit { text-transform: none; }

.data-table thead th {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--c-ink-soft);
}

.data-table tbody th { font-weight: 600; }
.data-table td { font-variant-numeric: tabular-nums; }
.data-table .numeric { text-align: right; }
.data-table tfoot th,
.data-table tfoot td {
  border-bottom: 0;
  font-weight: 600;
}

.checks tbody tr[data-result="pass"] .verdict-cell { color: var(--c-pass); font-weight: 600; }
.checks tbody tr[data-result="fail"] .verdict-cell { color: var(--c-fail); font-weight: 600; }
.checks tbody tr[data-result="fail"] { background: var(--c-fail-bg); }

.verdict {
  padding: 0.5rem 0.65rem;
  border-radius: 4px;
  font-size: 0.88rem;
  font-weight: 500;
}
.verdict[data-state="pass"] { color: var(--c-pass); background: var(--c-pass-bg); }
.verdict[data-state="fail"] { color: var(--c-fail); background: var(--c-fail-bg); }
.verdict[data-state="none"] { color: var(--c-ink-soft); background: var(--c-paper); }

/* ---- Status and footer ---- */

.status {
  min-height: 1.3rem;
  margin-top: var(--gap);
  font-size: 0.85rem;
  color: var(--c-ink-soft);
}

.footer {
  margin-top: 1.5rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--c-rule);
  font-size: 0.85rem;
  color: var(--c-ink-soft);
  display: grid;
  gap: 0.4rem;
  max-width: 70ch;
}