:root {
  --floor: #ecece6;
  --ceiling: #fffef8;
  --ink: #1a1a1a;
  --muted: #5c5c56;
  --shelf: #d8d8d0;
  --shelf_edge: #b8b8ae;
  --sign_yellow: #ffe94a;
  --sign_red: #d62828;
  --focus: #005bbb;
  --chip_shadow: rgba(26, 26, 26, 0.18);
}

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

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

body {
  background:
    linear-gradient(180deg, var(--ceiling) 0%, var(--floor) 42%, #e4e4dc 100%);
  color: var(--ink);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  line-height: 1.4;
}

[hidden] {
  display: none !important;
}

.aisle {
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

.aisle_header {
  margin-bottom: 1.5rem;
  padding: 1rem 1.1rem 1.1rem;
  border: 2px solid var(--ink);
  background: var(--sign_yellow);
  box-shadow: 4px 4px 0 var(--ink);
}

.aisle_tag {
  margin: 0 0 0.45rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.aisle_note {
  margin: 0.65rem 0 0;
  max-width: 34rem;
  font-size: 0.98rem;
}

.status_line {
  margin: 0 0 1rem;
  padding: 0.65rem 0.85rem;
  border: 2px solid var(--ink);
  background: #fff;
  font-weight: 600;
}

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

.drop_rack {
  position: relative;
  min-height: 16rem;
  padding: 2rem 1.25rem;
  border: 2px dashed var(--shelf_edge);
  background:
    repeating-linear-gradient(
      90deg,
      var(--shelf) 0,
      var(--shelf) 12px,
      #e8e8e2 12px,
      #e8e8e2 24px
    );
  box-shadow: inset 0 0 0 1px #fff;
  cursor: pointer;
}

.drop_rack.is_dragging {
  border-color: var(--ink);
  background-color: #f5f5ef;
}

.drop_rack_inner {
  max-width: 28rem;
  margin: 0 auto;
  padding: 1.25rem;
  border: 2px solid var(--ink);
  background: #fff;
  text-align: center;
  box-shadow: 3px 3px 0 var(--chip_shadow);
}

.drop_rack_title {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 800;
}

.drop_rack_hint {
  margin: 0.5rem 0 1rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.rack_button {
  display: inline-block;
  padding: 0.55rem 1rem;
  border: 2px solid var(--ink);
  background: var(--sign_red);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  cursor: pointer;
}

.rack_button:hover,
.rack_button:focus-visible {
  background: #b51f1f;
}

.workbench {
  display: grid;
  gap: 1.25rem;
}

.preview_panel {
  display: grid;
}

.preview_card {
  margin: 0;
  padding: 0.75rem;
  border: 2px solid var(--ink);
  background: #fff;
  box-shadow: 4px 4px 0 var(--chip_shadow);
}

.preview_card figcaption {
  margin-bottom: 0.55rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.preview_frame {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 10rem;
  max-height: 22rem;
  padding: 0.5rem;
  border: 1px solid var(--shelf_edge);
  background: #f0f0ea;
}

.preview_frame img {
  display: block;
  max-width: 100%;
  max-height: 20rem;
  width: auto;
  height: auto;
}

.controls_panel {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 1rem;
  padding: 0.85rem 1rem;
  border: 2px solid var(--ink);
  background: #fff;
}

.control_block {
  flex: 1 1 14rem;
}

.control_row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 0.35rem;
}

.control_label {
  font-size: 0.88rem;
  font-weight: 700;
}

.control_value {
  font-size: 1.1rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

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

.ghost_chip {
  padding: 0.5rem 0.85rem;
  border: 2px solid var(--ink);
  background: #fff;
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
}

.ghost_chip:hover,
.ghost_chip:focus-visible {
  background: var(--floor);
}

.chip_wall {
  padding: 0.25rem 0 0;
}

.chip_wall_heading {
  margin: 0 0 0.25rem;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.chip_wall_hint {
  margin: 0 0 0.85rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.chip_grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(9.5rem, 1fr));
  gap: 0.85rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.paint_chip {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  min-height: 11rem;
  padding: 0;
  border: 2px solid var(--ink);
  background: #fff;
  box-shadow: 4px 4px 0 var(--chip_shadow);
  color: var(--ink);
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  overflow: hidden;
}

.paint_chip:hover {
  transform: translate(-1px, -1px);
  box-shadow: 5px 5px 0 var(--chip_shadow);
}

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

.chip_swatch {
  display: block;
  flex: 1 1 auto;
  min-height: 5.5rem;
  background: var(--chip-color);
}

.chip_codes {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.55rem 0.6rem 0.65rem;
  background: #fff;
  border-top: 2px solid var(--ink);
}

.chip_hex {
  font-size: 0.95rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.chip_rgb {
  font-size: 0.72rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.chip_copy_hint {
  position: absolute;
  top: 0.45rem;
  right: 0.45rem;
  padding: 0.2rem 0.45rem;
  border: 2px solid var(--ink);
  background: var(--sign_yellow);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.12s ease;
}

.paint_chip.is_copied .chip_copy_hint {
  opacity: 1;
}

button:focus-visible,
label:focus-visible,
input:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

@media (min-width: 760px) {
  .workbench {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
    grid-template-areas:
      "preview controls"
      "chips chips";
  }

  .preview_panel {
    grid-area: preview;
  }

  .controls_panel {
    grid-area: controls;
    align-self: start;
    flex-direction: column;
    align-items: stretch;
  }

  .chip_wall {
    grid-area: chips;
  }
}