:root {
  --kraft: #c9a66b;
  --kraft_dark: #a8844a;
  --kraft_light: #e2c992;
  --cardboard: #b8955c;
  --ink: #1f1a14;
  --ink_soft: #4a3f32;
  --tape: #d4c4a0;
  --tape_shine: #f0e6cc;
  --label: #f5ead4;
  --label_ink: #2a2218;
  --stamp: #8b3a2a;
  --focus: #2d5f8a;
  --error_bg: #f0d4c8;
}

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

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

body {
  background-color: var(--kraft_dark);
  background-image:
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 3px,
      rgba(0, 0, 0, 0.03) 3px,
      rgba(0, 0, 0, 0.03) 4px
    ),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 18px,
      rgba(0, 0, 0, 0.04) 18px,
      rgba(0, 0, 0, 0.04) 19px
    ),
    linear-gradient(165deg, var(--kraft_light) 0%, var(--kraft) 45%, var(--cardboard) 100%);
  color: var(--ink);
  font-family: "Trebuchet MS", "Lucida Sans", sans-serif;
  line-height: 1.45;
}

.page_frame {
  max-width: 1180px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.site_header {
  position: relative;
  border: 3px solid var(--ink);
  background: var(--label);
  padding: 1.25rem 1.5rem 1.5rem;
  margin-bottom: 1.75rem;
  box-shadow: 4px 4px 0 var(--ink_soft);
}

.site_header::before {
  content: "";
  position: absolute;
  top: -14px;
  right: 2rem;
  width: 120px;
  height: 28px;
  background: linear-gradient(
    180deg,
    var(--tape_shine) 0%,
    var(--tape) 40%,
    #c8b88a 100%
  );
  border: 1px solid rgba(0, 0, 0, 0.15);
  transform: rotate(2deg);
  opacity: 0.9;
}

.warehouse_tag {
  margin: 0 0 0.5rem;
  font-family: "Courier New", Courier, monospace;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--stamp);
}

h1 {
  margin: 0;
  font-family: Impact, "Arial Black", "Franklin Gothic Heavy", sans-serif;
  font-weight: 400;
  font-size: clamp(2.2rem, 6vw, 3.8rem);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 0.95;
}

.lede {
  max-width: 34rem;
  margin: 0.75rem 0 0;
  color: var(--ink_soft);
  font-size: 1rem;
}

.unsupported_notice,
.status_message {
  margin: 0 0 1rem;
  padding: 0.75rem 0.9rem;
  border: 2px solid var(--ink);
  background: var(--error_bg);
  font-weight: 600;
}

[hidden] {
  display: none !important;
}

.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_stage {
  position: relative;
  min-height: 20rem;
  border: 3px dashed var(--ink);
  background:
  linear-gradient(135deg, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
  var(--kraft_light);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s;
}

.drop_stage.is_dragging {
  border-color: var(--stamp);
  background-color: #e8d4a8;
}

.drop_stage.is_disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

.tape_strip {
  position: absolute;
  pointer-events: none;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.35) 0%,
    var(--tape) 20%,
    var(--tape_shine) 50%,
    var(--tape) 80%,
    rgba(0, 0, 0, 0.08) 100%
  );
  border: 1px solid rgba(0, 0, 0, 0.12);
}

.tape_strip_top {
  top: 12px;
  left: 8%;
  width: 55%;
  height: 22px;
  transform: rotate(-1.5deg);
}

.tape_strip_corner {
  bottom: 18px;
  right: 6%;
  width: 90px;
  height: 22px;
  transform: rotate(4deg);
}

.drop_stage_copy {
  text-align: center;
  padding: 2rem 1.5rem;
}

.drop_stage_title {
  margin: 0;
  font-family: Impact, "Arial Black", sans-serif;
  font-size: clamp(1.4rem, 4vw, 2rem);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.drop_stage_hint {
  margin: 0.6rem 0 1.2rem;
  color: var(--ink_soft);
}

.choose_file_button {
  display: inline-block;
  padding: 0.65rem 1.4rem;
  border: 2px solid var(--ink);
  background: var(--label);
  font-family: "Courier New", Courier, monospace;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 3px 3px 0 var(--ink_soft);
}

.choose_file_button:hover {
  background: #fff8eb;
}

.workspace {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 1.25rem;
  align-items: start;
}

.preview_column {
  min-width: 0;
}

.preview_pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.preview_frame {
  margin: 0;
  border: 2px solid var(--ink);
  background: var(--label);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.2);
}

.label_tag {
  margin: 0;
  padding: 0.45rem 0.65rem;
  background: var(--ink);
  color: var(--label);
  font-family: "Courier New", Courier, monospace;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.preview_surface {
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem;
}

.preview_surface img {
  max-width: 100%;
  max-height: 320px;
  display: block;
}

.checkerboard {
  background-color: #ddd;
  background-image:
    linear-gradient(45deg, #bbb 25%, transparent 25%),
    linear-gradient(-45deg, #bbb 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #bbb 75%),
    linear-gradient(-45deg, transparent 75%, #bbb 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}

.file_strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.file_strip button {
  padding: 0.4rem 0.7rem;
  border: 2px solid var(--ink);
  background: var(--label);
  font-family: "Courier New", Courier, monospace;
  font-size: 0.75rem;
  cursor: pointer;
}

.file_strip button.is_active {
  background: var(--ink);
  color: var(--label);
}

.pack_console {
  border: 3px solid var(--ink);
  background: var(--label);
  padding: 1rem;
  box-shadow: 4px 4px 0 var(--ink_soft);
}

.console_heading {
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--ink);
  font-family: Impact, "Arial Black", sans-serif;
  font-size: 1rem;
  letter-spacing: 0.1em;
}

.field {
  margin-bottom: 1rem;
}

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

.field_label {
  font-family: "Courier New", Courier, monospace;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.field_value {
  font-family: "Courier New", Courier, monospace;
  font-size: 0.85rem;
  font-weight: 700;
}

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

.field input[type="range"]:disabled {
  opacity: 0.45;
}

.field_checkbox {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.4rem 0.6rem;
  align-items: center;
}

.field_checkbox input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--stamp);
}

.field_checkbox .field_label {
  grid-column: 2;
}

.field_checkbox .field_note {
  grid-column: 1 / -1;
}

.field_note,
.transparency_note {
  margin: 0.35rem 0 0;
  font-size: 0.82rem;
  color: var(--ink_soft);
}

.transparency_note {
  margin-bottom: 1rem;
  padding: 0.5rem 0.6rem;
  border: 1px dashed var(--ink_soft);
  background: rgba(255, 255, 255, 0.35);
}

.readout {
  display: grid;
  gap: 0.5rem;
  margin: 0 0 1rem;
  padding: 0.75rem;
  border: 2px solid var(--ink);
  background: #fff8eb;
}

.readout div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.readout dt {
  font-family: "Courier New", Courier, monospace;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.readout dd {
  margin: 0;
  font-family: "Courier New", Courier, monospace;
  font-weight: 700;
}

.action_row {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.primary_button,
.secondary_button,
.ghost_button {
  padding: 0.7rem 1rem;
  border: 2px solid var(--ink);
  font-family: Impact, "Arial Black", sans-serif;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
}

.primary_button {
  background: var(--stamp);
  color: #fff8f0;
  box-shadow: 3px 3px 0 var(--ink_soft);
}

.primary_button:hover:not(:disabled) {
  background: #9e4432;
}

.secondary_button {
  background: var(--kraft_light);
}

.ghost_button {
  background: transparent;
}

.primary_button:disabled,
.secondary_button:disabled,
.ghost_button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

@media (max-width: 860px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .preview_pair {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .page_frame {
    padding: 1.25rem 0.85rem 3rem;
  }

  .site_header {
    padding: 1rem;
  }

  .drop_stage {
    min-height: 16rem;
  }
}