/* Corrugator — a workbench feel: warm paper, cardboard accents, dark cut lines. */

:root {
  color-scheme: light dark;

  --paper: #fbf9f5;
  --surface: #ffffff;
  --surface-2: #f4f1ea;
  --ink: #1c1917;
  --ink-soft: #57534e;
  --ink-faint: #8b857e;
  --line: #e3ded4;
  --line-strong: #cdc6b8;
  --accent: #b45309;
  --accent-soft: #fef3c7;
  --accent-ink: #ffffff;
  --danger: #b91c1c;
  --focus: #2563eb;

  --radius: 10px;
  --radius-sm: 7px;
  --pad: 16px;
  --shadow: 0 1px 2px rgb(28 25 23 / 6%), 0 4px 12px rgb(28 25 23 / 5%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #17150f;
    --surface: #201d17;
    --surface-2: #2a2620;
    --ink: #f5f1e8;
    --ink-soft: #c3bcaf;
    --ink-faint: #8b857a;
    --line: #35302a;
    --line-strong: #4a443b;
    --accent: #f59e0b;
    --accent-soft: #3a2c10;
    --accent-ink: #1c1917;
    --danger: #f87171;
    --focus: #60a5fa;
    --shadow: 0 1px 2px rgb(0 0 0 / 40%), 0 4px 14px rgb(0 0 0 / 30%);
  }
}

* { box-sizing: border-box; }

/* Author styles beat the UA stylesheet, so any element we set `display` on
   would keep showing when hidden. Make `hidden` win everywhere. */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  background: var(--paper);
  color: var(--ink);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}

/* ── Top bar ─────────────────────────────────────────────────── */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px var(--pad);
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { font-size: 30px; line-height: 1; }
.brand h1 { margin: 0; font-size: 18px; letter-spacing: -0.01em; }
.brand p { margin: 1px 0 0; font-size: 12.5px; color: var(--ink-faint); }

.link {
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}
.link:hover { text-decoration: underline; }

/* ── Layout ──────────────────────────────────────────────────── */

.layout {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr) 300px;
  gap: 1px;
  background: var(--line);
}

.panel {
  overflow-y: auto;
  padding: var(--pad);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.step h2 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.step-num {
  display: grid;
  place-items: center;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 11px;
  font-weight: 700;
}

/* ── Dropzone ────────────────────────────────────────────────── */

.dropzone {
  display: grid;
  place-items: center;
  min-height: 150px;
  padding: 18px 14px;
  border: 2px dashed var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface-2);
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.dropzone:hover,
.dropzone:focus-visible { border-color: var(--accent); }
.dropzone.dragging {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.dropzone.has-image { padding: 8px; min-height: 0; border-style: solid; }
.dropzone.has-image .dropzone-empty { display: none; }

.dropzone-hint { margin: 0 0 12px; font-size: 13px; color: var(--ink-faint); }
.dropzone-buttons { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }

.thumb {
  display: block;
  width: 100%;
  max-height: 190px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  background: #fff;
}

/* ── Form controls ───────────────────────────────────────────── */

.field { display: block; margin-bottom: 14px; }
.field:last-child { margin-bottom: 0; }

.field-label {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 5px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-soft);
}
.field-label output {
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  color: var(--ink-faint);
}

.field-note {
  display: block;
  margin-top: 3px;
  font-size: 11.5px;
  color: var(--ink-faint);
}

.field-inline { flex: 1; margin-bottom: 0; }
.size-row { display: flex; gap: 10px; }

select,
input[type="number"] {
  width: 100%;
  padding: 7px 9px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
}

input[type="range"] {
  width: 100%;
  margin: 2px 0;
  accent-color: var(--accent);
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* ── Buttons ─────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 13px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.12s, border-color 0.12s;
}
.btn:hover:not(:disabled) { background: var(--surface-2); border-color: var(--ink-faint); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}
.btn-primary:hover:not(:disabled) { filter: brightness(1.08); background: var(--accent); }

.btn-quiet {
  border-color: transparent;
  background: none;
  color: var(--ink-faint);
  font-weight: 500;
  font-size: 12.5px;
  margin-top: 8px;
}
.btn-quiet:hover:not(:disabled) { color: var(--accent); background: none; }

.btn-block { width: 100%; }
.btn-icon { padding: 6px 9px; font-size: 15px; line-height: 1; }
.btn-bg { font-size: 12.5px; gap: 7px; }
.bg-swatch {
  width: 13px;
  height: 13px;
  border-radius: 3px;
  box-shadow: inset 0 0 0 1px rgb(0 0 0 / 25%);
  background: #fff;
}
.stage-bar[data-bg="checker"] .bg-swatch {
  background:
    linear-gradient(45deg, #ddd 25%, transparent 25%) 0 0 / 6px 6px,
    linear-gradient(-45deg, #ddd 25%, transparent 25%) 0 3px / 6px 6px,
    linear-gradient(45deg, transparent 75%, #ddd 75%) 3px -3px / 6px 6px,
    linear-gradient(-45deg, transparent 75%, #ddd 75%) -3px 0 / 6px 6px,
    #fafafa;
}
.stage-bar[data-bg="dark"] .bg-swatch { background: #2b2b2b; }

.export-buttons { display: flex; flex-direction: column; gap: 8px; margin: 12px 0 10px; }

/* ── Stage ───────────────────────────────────────────────────── */

.stage-wrap {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--surface);
}

.stage-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px var(--pad);
  border-bottom: 1px solid var(--line);
}

.stage-bar-group { display: flex; flex-wrap: wrap; align-items: center; gap: 5px; }
.stage-bar-right { margin-left: auto; }

.sep {
  width: 1px;
  height: 20px;
  margin: 0 3px;
  background: var(--line);
}

.tool {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: none;
  color: var(--ink-soft);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.tool:hover { background: var(--surface-2); }
.tool[aria-pressed="true"] {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--ink);
}

.tool-swatch {
  width: 11px;
  height: 11px;
  border-radius: 3px;
  background: var(--c, transparent);
  box-shadow: inset 0 0 0 1px rgb(0 0 0 / 12%);
}
.tool-swatch-select {
  width: 11px;
  background: none;
  box-shadow: none;
  color: currentColor;
}
.tool-swatch-select::before {
  content: "⤡";
  display: block;
  margin-top: -3px;
  font-size: 12px;
  line-height: 1;
  transform: scaleX(-1);
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-soft);
  cursor: pointer;
}

.stage {
  position: relative;
  flex: 1;
  min-height: 260px;
  overflow: hidden;
}

/* The pattern's colours are fixed print colours: black cut lines on white
   paper. So the stage does not follow the page theme, or the cut line would
   vanish in dark mode. Paper is the default; the other two are for checking
   light marks and for eyes that prefer it. */
.stage[data-bg="paper"] {
  background:
    linear-gradient(#0000000d 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(90deg, #0000000d 1px, transparent 1px) 0 0 / 24px 24px,
    #ffffff;
}
.stage[data-bg="checker"] {
  background:
    linear-gradient(45deg, #e9e5dc 25%, transparent 25%) 0 0 / 18px 18px,
    linear-gradient(-45deg, #e9e5dc 25%, transparent 25%) 0 9px / 18px 18px,
    linear-gradient(45deg, transparent 75%, #e9e5dc 75%) 9px -9px / 18px 18px,
    linear-gradient(-45deg, transparent 75%, #e9e5dc 75%) -9px 0 / 18px 18px,
    #f8f6f1;
}
.stage[data-bg="dark"] {
  background:
    linear-gradient(#ffffff12 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(90deg, #ffffff12 1px, transparent 1px) 0 0 / 24px 24px,
    #2b2b2b;
}
/* On the dark stage the fixed-black cut line still needs to read, so lift it. */
.stage[data-bg="dark"] .preview [stroke="#111111"] { stroke: #f5f1e8; }

.preview {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}
.preview.tool-select { cursor: grab; }
.preview.tool-select.dragging { cursor: grabbing; }
.preview.tool-draw { cursor: crosshair; }

.stage-empty,
.stage-busy {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 8px;
  color: var(--ink-faint);
  font-size: 14px;
  pointer-events: none;
}
.stage-busy {
  inset: auto 12px 12px auto;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--surface);
  box-shadow: var(--shadow);
  font-size: 12.5px;
}

.spinner {
  width: 13px;
  height: 13px;
  border: 2px solid var(--line-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation-duration: 2s; } }

.stage-help {
  margin: 0;
  padding: 7px var(--pad);
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: 12px;
}

/* Selection handles drawn into the preview SVG. */
.sel-outline {
  fill: none;
  stroke: var(--focus);
  stroke-width: 0.5;
  stroke-dasharray: 1.6 1.2;
  vector-effect: non-scaling-stroke;
  pointer-events: none;
}
.mark-hit { fill: transparent; stroke: transparent; cursor: move; }

/* ── Legend and notes ────────────────────────────────────────── */

.legend, .notes { margin: 0; padding: 0; list-style: none; }

.legend li {
  display: grid;
  grid-template-columns: 34px 1fr;
  align-items: center;
  gap: 10px;
  padding: 7px 0;
  border-bottom: 1px solid var(--line);
}
.legend li:last-child { border-bottom: 0; }
.legend svg { display: block; width: 34px; height: 14px; overflow: visible; }
.legend b { display: block; font-size: 13px; font-weight: 650; }
.legend span { display: block; font-size: 11.5px; line-height: 1.35; color: var(--ink-faint); }

.notes li {
  padding: 6px 0 6px 20px;
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--ink-soft);
  background-repeat: no-repeat;
  background-position: 0 8px;
  background-size: 9px 9px;
}
.note-warn {
  color: var(--danger);
  background-image: radial-gradient(circle, currentColor 42%, transparent 45%);
}
.note-info {
  background-image: radial-gradient(circle, var(--line-strong) 42%, transparent 45%);
}

.hint {
  margin: 8px 0 0;
  font-size: 11.5px;
  line-height: 1.45;
  color: var(--ink-faint);
}

/* ── Footer ──────────────────────────────────────────────────── */

.footer {
  padding: 10px var(--pad);
  border-top: 1px solid var(--line);
  background: var(--surface);
}
.footer p { margin: 0; font-size: 11.5px; color: var(--ink-faint); }
.footer a { color: inherit; }

/* ── Narrow screens ──────────────────────────────────────────── */

@media (max-width: 1040px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-areas: "stage" "left" "right";
  }
  .panel { overflow: visible; }
  .panel-left { grid-area: left; }
  .panel-right { grid-area: right; }
  .stage-wrap { grid-area: stage; }
  .stage { min-height: 58vh; }
  body { height: auto; min-height: 100%; }
  .layout { min-height: 0; }
}

@media (max-width: 560px) {
  .topbar { flex-wrap: wrap; }
  .brand p { display: none; }
  /* The toolbar wraps rather than dropping the labels: a row of bare colour
     swatches is unreadable on a phone, where there is no hover to fall back on. */
  .tool { padding: 6px 8px; font-size: 12.5px; }
  .stage-bar { padding: 8px 10px; }
}