.gcode-layout {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 3rem auto;
  padding: 0 2rem;
}

.gcode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-bottom: 2rem;
}

.gcode-panel {
  background: var(--surface);
  padding: 1.75rem;
}

.panel-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.field-group label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.field-group input,
.field-group select {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  outline: none;
  width: 100%;
  transition: border-color 0.15s;
  appearance: none;
}

.field-group input:focus,
.field-group select:focus {
  border-color: var(--accent);
}

.gcode-output {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1.75rem;
}

.gcode-output textarea {
  width: 100%;
  height: 320px;
  background: #050505;
  border: 1px solid var(--border);
  color: #7aff9a;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 1rem;
  resize: vertical;
  outline: none;
  line-height: 1.6;
}

.gcode-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

#gcodeStatus {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.upload-zone {
  border: 1px dashed var(--border);
  background: var(--surface2);
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s;
  margin-bottom: 1rem;
}

.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--accent);
}

.upload-zone p {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.upload-zone .upload-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

@media (max-width: 640px) {
  .gcode-grid { grid-template-columns: 1fr; }
}

/* ── New row layout ── */
.gcode-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-bottom: 1px;
}

/* stack all rows under one outer border */
.gcode-layout > .gcode-row:first-child {
  border-bottom: none;
}

.gcode-generate-row {
  margin: 1.25rem 0 0;
}

/* ── Inline field pairs ── */
.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

/* ── Filament preset buttons ── */
.preset-btns {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 0.25rem;
}

.preset-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.35rem 0.9rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.preset-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.preset-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #080808;
}

.preset-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 0.75rem;
  border-left: 2px solid var(--border);
  padding-left: 0.75rem;
}

.upload-filename {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  margin-top: 0.4rem;
}

.visually-hidden {
  display: none;
}

@media (max-width: 640px) {
  .gcode-row   { grid-template-columns: 1fr; }
  .field-row   { grid-template-columns: 1fr; }
}