/* ─── Drop zone — DRAFTING TABLE ─────────────────────────────── */
.dropzone {
  position: relative;
  background: var(--panel);
  border: 1.5px solid var(--rule);
  padding: 60px 36px 56px;
  text-align: center;
  cursor: pointer;
  margin-bottom: 28px;
  transition: border-color .2s ease, background-color .2s ease, box-shadow .2s ease;
}
/* inner ghost rule */
.dropzone::before {
  content: '';
  position: absolute;
  inset: 6px;
  border: 1px dashed var(--border);
  pointer-events: none;
  opacity: 0.55;
}
.dropzone:hover { border-color: var(--blueprint); }
[data-theme="light"] .dropzone:hover { border-color: var(--blueprint-lo); }
.dropzone.drag-over {
  border-color: var(--rust);
  background: var(--hover);
}
.dropzone.drag-over::before {
  border-color: var(--rust);
  opacity: 0.7;
}
.dropzone.drag-over .drop-icon { transform: translateY(-5px); }
.dropzone:focus-visible {
  outline: none;
  border-color: var(--blueprint);
  box-shadow: 0 0 0 3px rgba(107,184,240,0.30);
}

/* corner brackets — drafted right-angle ticks */
.dropzone .bracket-tl,
.dropzone .bracket-tr,
.dropzone .bracket-bl,
.dropzone .bracket-br {
  position: absolute;
  width: 16px; height: 16px;
  border: 1.5px solid var(--rule);
}
.dropzone .bracket-tl { top: -1px;  left: -1px;  border-right: 0; border-bottom: 0; }
.dropzone .bracket-tr { top: -1px;  right: -1px; border-left: 0;  border-bottom: 0; }
.dropzone .bracket-bl { bottom: -1px; left: -1px;  border-right: 0; border-top: 0; }
.dropzone .bracket-br { bottom: -1px; right: -1px; border-left: 0;  border-top: 0; }

/* title tab — "DRAFTING TABLE" on the top edge */
.dropzone .dz-tag {
  position: absolute;
  top: 0; left: 28px;
  transform: translateY(-50%);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.28em;
  color: var(--blueprint);
  background: var(--bg-main);
  padding: 2px 10px;
  border: 1px solid var(--rule);
}
[data-theme="light"] .dropzone .dz-tag { color: var(--blueprint-lo); }

/* dimension lines down both sides — like a drafted measurement */
.dropzone .dz-dim-l,
.dropzone .dz-dim-r {
  position: absolute;
  top: 26px;
  bottom: 26px;
  width: 1px;
  background: var(--blueprint);
  opacity: 0.35;
}
[data-theme="light"] .dropzone .dz-dim-l,
[data-theme="light"] .dropzone .dz-dim-r { background: var(--blueprint-lo); opacity: 0.45; }
.dropzone .dz-dim-l { left: 16px; }
.dropzone .dz-dim-r { right: 16px; }
/* dimension arrows (top + bottom tick caps) */
.dropzone .dz-dim-l::before, .dropzone .dz-dim-l::after,
.dropzone .dz-dim-r::before, .dropzone .dz-dim-r::after {
  content: '';
  position: absolute;
  left: -3px;
  width: 7px;
  height: 1px;
  background: inherit;
  opacity: 1;
}
.dropzone .dz-dim-l::before, .dropzone .dz-dim-r::before { top: 0; }
.dropzone .dz-dim-l::after,  .dropzone .dz-dim-r::after  { bottom: 0; }

.dropzone-content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.drop-icon {
  width: 44px; height: 44px;
  color: var(--blueprint);
  stroke-width: 1.5;
  transition: transform .2s ease, color .2s ease;
}
[data-theme="light"] .drop-icon { color: var(--blueprint-lo); }
.drop-title {
  font-family: var(--display);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--ink);
}
.drop-sub {
  font-family: var(--mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
}
.drop-sub kbd {
  display: inline-block;
  background: var(--panel-hi);
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  padding: 1px 7px;
  border-radius: 1px;
  color: var(--rust);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  margin: 0 3px;
}
input[type="file"] { display: none; }