/* tile-takeoff — drafting-paper palette, technical type, no framework. */

:root {
  --ground: #E9EDF0;
  --surface: #FDFEFE;
  --surface-2: #DFE5E9;
  --ink: #0F1B24;
  --ink-2: #4C606E;
  --ink-3: #7B8D99;
  --rule: #C3CED6;
  --blue: #1B5B87;
  --blue-soft: #B9D3E4;
  --cut: #C24A17;
  --cut-soft: #F0CDBB;
  --good: #1F6B4F;
  --grid: rgba(27, 91, 135, .09);
  --shadow: 0 1px 0 rgba(15,27,36,.04), 0 12px 32px -22px rgba(15,27,36,.5);
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Consolas, monospace;
  --sans: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --arabic: "IBM Plex Sans Arabic", "Segoe UI", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground: #0C141A;
    --surface: #131F27;
    --surface-2: #1B2A34;
    --ink: #E2EAEF;
    --ink-2: #9DB0BC;
    --ink-3: #6E828F;
    --rule: #283A46;
    --blue: #6BAED6;
    --blue-soft: #2A4E66;
    --cut: #EE7B45;
    --cut-soft: #4A2A1C;
    --good: #58B08C;
    --grid: rgba(107, 174, 214, .09);
    --shadow: 0 1px 0 rgba(0,0,0,.3), 0 12px 32px -22px rgba(0,0,0,.9);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body[data-lang="ar"] { font-family: var(--arabic); }

h1, h2, h3 { margin: 0; line-height: 1.3; text-wrap: balance; }
p { margin: 0; }
:focus-visible { outline: 2px solid var(--cut); outline-offset: 2px; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ── top bar ── */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--ground) 90%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.topbar-inner {
  max-width: 960px; margin: 0 auto; padding: 10px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.wordmark { font-family: var(--mono); font-size: 15px; font-weight: 500; letter-spacing: -.01em; }
.wordmark-dim { color: var(--ink-3); }
.topbar-right { display: flex; align-items: center; gap: 14px; }
.privacy-badge {
  font-size: 12px; color: var(--good);
  border: 1px solid currentColor; border-radius: 999px; padding: 2px 10px;
  white-space: nowrap;
}
.switch { display: flex; border: 1px solid var(--rule); background: var(--surface); direction: ltr; }
.switch button {
  font-family: var(--mono); font-size: 12px; letter-spacing: .08em;
  padding: 4px 10px; border: 0; background: transparent; color: var(--ink-3); cursor: pointer;
}
.switch button + button { border-left: 1px solid var(--rule); }
.switch button[aria-pressed="true"] { background: var(--blue); color: var(--surface); }

/* ── layout ── */
main { max-width: 960px; margin: 0 auto; padding: 28px 20px 60px; }

.step {
  background: var(--surface);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow);
  padding: 22px;
  margin-bottom: 20px;
}
.step > h2 {
  display: flex; align-items: center; gap: 12px;
  font-size: 19px; margin-bottom: 6px;
}
.step-n {
  font-family: var(--mono); font-size: 12px; color: var(--blue);
  border: 1px solid var(--blue-soft);
  width: 26px; height: 26px; display: grid; place-items: center; flex: none;
}
.hint { color: var(--ink-2); font-size: 14px; max-width: 68ch; }
.step > .hint { margin-bottom: 16px; }

/* ── drop zone ── */
.drop {
  margin-top: 14px;
  border: 2px dashed var(--rule);
  background: var(--surface-2);
  padding: 32px 20px;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  cursor: pointer; text-align: center;
  transition: border-color .15s, background .15s;
}
.drop:hover, .drop:focus-visible { border-color: var(--blue); }
.drop.dragging { border-color: var(--blue); background: var(--blue-soft); }
.drop-icon { width: 56px; color: var(--blue); }
.drop-label { font-weight: 600; }
.drop-sub { font-size: 13px; color: var(--ink-3); }

/* ── plan viewer ── */
.plan { margin-top: 14px; border: 1px solid var(--rule); }
.plan-bar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 10px 14px; background: var(--surface-2); border-bottom: 1px solid var(--rule);
}
.plan-name { font-weight: 600; font-size: 14px; }
.plan-meta { font-family: var(--mono); font-size: 12px; color: var(--ink-3); }
.plan-bar .link-btn { margin-inline-start: auto; }
.plan-body { display: grid; grid-template-columns: 1fr; }
@media (min-width: 820px) { .plan-body { grid-template-columns: 3fr 2fr; } }

.plan-view { padding: 12px; border-inline-end: 1px solid var(--rule); min-width: 0; }
#page-canvas {
  display: block; max-width: 100%; height: auto; margin: 0 auto;
  border: 1px solid var(--rule); background: #fff;
}
.plan-controls { display: flex; align-items: center; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.page-label { font-family: var(--mono); font-size: 12px; color: var(--ink-2); }
.spacer { flex: 1; }
.zoom { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--ink-2); }
.zoom input { width: 90px; }

.plan-text { padding: 12px 14px; min-width: 0; max-height: 460px; overflow-y: auto; }
.plan-text h3 { font-size: 14px; margin-bottom: 4px; }
.dim-list { list-style: none; margin: 10px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.dim-list button {
  font-family: var(--mono); font-size: 12px;
  background: var(--surface-2); border: 1px solid var(--rule); color: var(--ink);
  padding: 3px 8px; cursor: pointer; direction: ltr;
}
.dim-list button:hover { border-color: var(--blue); color: var(--blue); }

/* ── rooms table ── */
.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 8px 10px; border-bottom: 1px solid var(--rule); text-align: start; }
thead th {
  font-family: var(--mono); font-size: 11px; letter-spacing: .07em; text-transform: uppercase;
  color: var(--ink-3); font-weight: 400; border-bottom: 1px solid var(--ink-3);
}
tfoot th, tfoot td { border-bottom: 0; font-weight: 600; }
.num { font-variant-numeric: tabular-nums; text-align: end; }
.rooms input {
  width: 100%; min-width: 70px; font: inherit; color: inherit;
  background: transparent; border: 1px solid transparent; padding: 4px 6px;
}
.rooms input:hover { border-color: var(--rule); }
.rooms input:focus { border-color: var(--blue); background: var(--surface); outline: none; }
.rooms input[type="number"] { text-align: end; font-variant-numeric: tabular-nums; }
.rooms select { font: inherit; color: inherit; background: var(--surface); border: 1px solid var(--rule); padding: 3px 4px; }
.row-area { font-variant-numeric: tabular-nums; text-align: end; color: var(--ink-2); }
.row-area .computed { display: inline-block; padding: 4px 7px; }

/* ── fields ── */
.fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 16px; }
.field { display: flex; flex-direction: column; gap: 4px; font-size: 14px; }
.field > span { font-weight: 600; }
.field input {
  font: inherit; font-family: var(--mono); color: inherit;
  background: var(--surface); border: 1px solid var(--rule); padding: 7px 9px;
}
.field input:focus { border-color: var(--blue); outline: none; }
.field small { color: var(--ink-3); font-size: 12px; }

/* ── buttons ── */
.ghost-btn, .primary-btn, .link-btn {
  font: inherit; cursor: pointer; border: 1px solid var(--rule);
  background: var(--surface); color: var(--ink); padding: 6px 12px;
}
.ghost-btn:hover, .primary-btn:hover { border-color: var(--blue); color: var(--blue); }
.primary-btn { background: var(--blue); color: #fff; border-color: var(--blue); font-weight: 600; padding: 9px 18px; }
.primary-btn:hover { background: var(--ink); border-color: var(--ink); color: #fff; }
.link-btn { border: 0; background: none; color: var(--blue); text-decoration: underline; padding: 0; font-size: 13px; }
#add-room { margin-top: 12px; }

/* ── results ── */
.headline {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 16px;
  border-inline-start: 3px solid var(--good);
  background: var(--surface-2); padding: 14px 16px; margin-bottom: 18px;
}
.headline .big { font-family: var(--mono); font-size: 24px; font-weight: 500; color: var(--good); }
.headline .label { font-size: 13px; color: var(--ink-2); }

.res-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px; margin-bottom: 18px; border: 1px solid var(--rule); background: var(--surface);
}
/* A box-shadow ring draws the separators, so a half-empty last row shows the
   surface colour rather than a stripe of rule colour. */
.res-cell {
  background: var(--surface); padding: 14px;
  display: flex; flex-direction: column; gap: 2px;
  box-shadow: 0 0 0 1px var(--rule);
}
.res-cell .k { font-family: var(--mono); font-size: 11px; letter-spacing: .07em; text-transform: uppercase; color: var(--ink-3); }
.res-cell .v { font-family: var(--mono); font-size: 20px; font-variant-numeric: tabular-nums; }
.res-cell .n { font-size: 12.5px; color: var(--ink-2); }

#layout-canvas { display: block; width: 100%; height: auto; border: 1px solid var(--rule); background: var(--surface); }
.fig-cap { font-family: var(--mono); font-size: 12px; color: var(--ink-3); margin-top: 6px; }

.waste-good { color: var(--good); font-variant-numeric: tabular-nums; }
.waste-bad { color: var(--cut); font-variant-numeric: tabular-nums; }
.res-h3 { font-size: 15px; margin: 22px 0 8px; }

.notes { list-style: none; margin: 8px 0 0; padding: 0; display: flex; flex-direction: column; gap: 8px; font-size: 14px; color: var(--ink-2); }
.notes li { display: grid; grid-template-columns: auto 1fr; gap: 10px; }
.notes li::before { content: "—"; color: var(--cut); font-family: var(--mono); }

.empty { color: var(--ink-3); font-size: 14px; }
.warn { border-inline-start: 3px solid var(--cut); background: var(--cut-soft); padding: 12px 14px; font-size: 14px; }

.actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; padding: 0 2px; }
.page-footer { margin-top: 34px; padding-top: 16px; border-top: 1px solid var(--rule); font-size: 13px; color: var(--ink-3); display: flex; flex-direction: column; gap: 4px; }
.page-footer a { color: var(--blue); }

/* ── print ── */
@media print {
  :root { --ground: #fff; --surface: #fff; --surface-2: #f4f6f7; --ink: #000; --ink-2: #333; --ink-3: #555; --rule: #bbb; }
  body { background: #fff; font-size: 11pt; }
  .topbar, .no-print, .drop, .plan-controls, #add-room, .page-footer a { display: none !important; }
  main { max-width: none; padding: 0; }
  .step { border: 0; box-shadow: none; padding: 0 0 12pt; page-break-inside: avoid; }
  .step:not(.results):not(:has(#rooms)) { display: none; }
  .results { page-break-before: avoid; }
  input, select { border: 0 !important; background: none !important; }
}