/* ── Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Barlow+Condensed:wght@300;400;500;600;700&family=JetBrains+Mono:ital,wght@0,300;0,400;0,500;0,600;1,300&display=swap');

/* ── Design tokens ── */
:root {
  --bg-void:    #030609;
  --bg-deep:    #060a0f;
  --bg-panel:   #080d14;
  --bg-card:    #0c1219;
  --bg-input:   #050910;
  --bg-surface: #0a1018;

  --border-0:   #0d1720;
  --border-1:   #152030;
  --border-2:   #1e3045;

  --accent:       #00cba8;
  --accent-hi:    #00eecb;
  --accent-dim:   rgba(0, 203, 168, 0.10);
  --accent-glow:  rgba(0, 203, 168, 0.18);
  --accent-muted: #006e5b;

  --action:     #ff5c28;
  --action-dim: rgba(255, 92, 40, 0.12);

  --danger:     #c83232;
  --danger-dim: rgba(200, 50, 50, 0.12);

  --text-hi:  #ccd8e8;
  --text-mid: #607a90;
  --text-lo:  #2a3d52;
  --text-acc: #00eecb;

  --mono:    'JetBrains Mono', 'Courier New', monospace;
  --display: 'Barlow Condensed', sans-serif;

  --tb-h:    30px;
  --ph-h:    36px;
  --r:       2px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Body ── */
body {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  font-family: var(--mono);
  font-size: 11px;
  background: var(--bg-void);
  color: var(--text-hi);
}

/* Dot-grid atmosphere */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle, var(--border-0) 1px, transparent 1px);
  background-size: 22px 22px;
  pointer-events: none;
  z-index: 0;
}

/* ════════════════════════════
   TITLE BAR
════════════════════════════ */
#titlebar {
  position: relative;
  z-index: 10;
  height: var(--tb-h);
  flex-shrink: 0;
  /* Distinct "instrument chrome" strip: a slightly raised slate tone — clearly set
     apart from the near-black Panel 2/3 headers (var(--bg-void)) — plus a crisper
     bottom edge (accent hairline + soft drop shadow) so the bar reads as the app
     header sitting ABOVE the panels, not as another panel header. Kept dark and
     calm to avoid drawing attention. */
  background: linear-gradient(180deg, #0c131d 0%, #080e15 100%);
  border-bottom: 1px solid var(--border-2);
  box-shadow: 0 1px 0 rgba(0, 203, 168, 0.06), 0 3px 8px rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
}

.tb-name {
  font-family: var(--display);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 3.5px;
  color: var(--text-hi);
  text-transform: uppercase;
  text-shadow: 0 0 10px rgba(0, 203, 168, 0.10);
}

/* Title-bar left group (RESET + example loader) and right group (FEEDBACK / LOGIN),
   pinned to the bar edges so the centered title stays centered. */
#tb-left {
  position: absolute;
  left: 14px;
  display: flex;
  align-items: center;
}
#tb-right {
  position: absolute;
  right: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* The dropdown + LOAD EXAMPLE belong together; extra space separates them from RESET. */
#tb-example-group {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 22px;
}

.tb-select {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.5px;
  padding: 3px 6px;
  color: var(--text-mid);
  background: var(--bg-input);
  border: 1px solid var(--border-2);
  border-radius: 2px;
  cursor: pointer;
}
.tb-select:hover { border-color: var(--accent-muted); color: var(--text-hi); }

/* RESET / LOAD EXAMPLE / FEEDBACK / LOGIN — light, inconspicuous title-bar buttons,
   faintly surfaced so they read as header chrome (distinct from the flat panel-header
   buttons) without competing with the title */
.btn-reset {
  padding: 3px 10px;
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 1.5px;
  border-color: var(--border-2);
  color: var(--text-mid);
  background: rgba(150, 180, 210, 0.035);
}

.btn-reset:hover {
  border-color: var(--accent-muted);
  color: var(--text-hi);
  background: var(--bg-surface);
  box-shadow: none;
}

/* Magic-link login popup — drops down under the LOGIN button */
.login-popup {
  position: absolute;
  top: calc(var(--tb-h) + 4px);
  right: 14px;
  z-index: 30;
  width: 232px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-2);
  border-radius: 3px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.55);
}
.login-popup.hidden { display: none; }

.login-popup-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 1.5px;
  color: var(--text-lo);
}

#login-email {
  font-family: var(--mono);
  font-size: 11px;
  padding: 5px 8px;
  color: var(--text-hi);
  background: var(--bg-input);
  border: 1px solid var(--border-1);
  border-radius: 2px;
}
#login-email:focus { outline: none; border-color: var(--accent-muted); }

.login-popup-actions { display: flex; gap: 6px; }
.login-popup-actions button { flex: 1; }

.login-msg {
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.4;
  color: var(--text-mid);
  min-height: 1em;
}
.login-msg.error { color: var(--danger); }
.login-msg.ok    { color: var(--text-acc); }

/* Contextual note at the top of the login popup (e.g. shown via FEEDBACK) */
.login-note {
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.4;
  color: var(--text-acc);
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border-1);
}
.login-note.hidden { display: none; }

/* Feedback popup reuses .login-popup positioning; a bit wider for the form */
.feedback-popup { width: 280px; }

.fb-field {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.5px;
  color: var(--text-lo);
}

.fb-field input[type="file"] {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-mid);
}

#fb-text {
  font-family: var(--mono);
  font-size: 11px;
  padding: 5px 8px;
  color: var(--text-hi);
  background: var(--bg-input);
  border: 1px solid var(--border-1);
  border-radius: 2px;
  resize: vertical;
}
#fb-text:focus { outline: none; border-color: var(--accent-muted); }

.fb-wordcount {
  font-family: var(--mono);
  font-size: 9px;
  color: var(--text-lo);
  text-align: right;
}
.fb-wordcount.over { color: var(--danger); }

/* ════════════════════════════
   MAIN LAYOUT
════════════════════════════ */
#main-area {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
  z-index: 1;
}

/* ════════════════════════════
   PANEL 4 — FOOTER
════════════════════════════ */
#panel4 {
  position: relative;
  z-index: 10;
  height: 22px;
  flex-shrink: 0;
  background: var(--bg-void);
  border-top: 1px solid var(--border-1);
  display: flex;
  align-items: center;
  justify-content: center;
}

.footer-text {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 1px;
  color: var(--text-lo);
}

/* Fine-print note pinned to the bottom-left; the centered copyright stays centered. */
.footer-note {
  position: absolute;
  left: 14px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.5px;
  color: var(--text-lo);
  white-space: nowrap;
}

#app-version { color: var(--text-mid); }

/* ── Panel 1 ── */
#panel1 {
  width: 35%;
  min-width: 255px;
  height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--bg-panel);
  border-right: 1px solid var(--border-1);
  overflow-y: auto;
}

/* ── Right column ── */
#right-column {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── Panel 2 ── */
#panel2 {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border-1);
  overflow: hidden;
}

/* ── Panel 3 ── */
#panel3 {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-deep);
  overflow: hidden;
}

/* ════════════════════════════
   PANEL HEADERS
════════════════════════════ */
.panel-header {
  position: relative;
  height: var(--ph-h);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-right: 10px;
  background: var(--bg-void);
  border-bottom: 1px solid var(--border-1);
  overflow: hidden;
}

/* Teal left-edge accent bar */
.panel-header::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent-hi), var(--accent-muted));
}

.ph-left {
  display: flex;
  align-items: stretch;
  height: 100%;
}

.panel-title {
  display: flex;
  align-items: center;
  font-family: var(--display);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 2.5px;
  color: var(--text-hi);
  padding: 0 14px 0 16px;
  text-transform: uppercase;
}


/* ════════════════════════════
   BUTTONS
════════════════════════════ */
.header-buttons { display: flex; gap: 5px; align-items: center; }

.btn-icon {
  padding: 4px 6px;
  line-height: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.header-sep {
  width: 1px;
  height: 16px;
  background: var(--border-2);
  flex-shrink: 0;
  margin: 0 2px;
}

button {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 1px;
  padding: 4px 11px;
  border: 1px solid var(--border-2);
  background: transparent;
  color: var(--text-mid);
  border-radius: var(--r);
  cursor: pointer;
  transition: color 0.12s, border-color 0.12s, background 0.12s, box-shadow 0.12s;
}

button:hover {
  border-color: var(--accent-muted);
  color: var(--text-acc);
  background: var(--accent-dim);
}

button:active {
  background: var(--accent-glow);
}

/* Active / pressed state for toggle buttons (zoom-to-selection) */
.btn-active,
.btn-active:hover {
  border-color: var(--accent-muted);
  color: var(--text-acc);
  background: var(--accent-dim);
  box-shadow: inset 0 0 0 1px var(--accent-muted);
}

/* Generate — primary CTA */
.btn-generate {
  border-color: var(--accent-muted);
  color: var(--text-acc);
  background: var(--accent-dim);
  font-weight: 600;
}

.btn-generate:hover {
  border-color: var(--accent);
  box-shadow: 0 0 14px var(--accent-glow);
  background: var(--accent-glow);
  color: var(--accent-hi);
}

/* Confirm / Cancel in mask entry */
.btn-confirm {
  border-color: var(--accent-muted);
  color: var(--text-acc);
  background: var(--accent-dim);
}
.btn-confirm:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
  color: var(--accent-hi);
}

.btn-cancel {
  border-color: var(--border-2);
  color: var(--text-mid);
}

/* Add step / mask */
.add-btn {
  margin: 6px 0 2px;
  align-self: flex-start;
  padding: 5px 12px;
  font-size: 10px;
  letter-spacing: 0.8px;
}

/* Pin the Add Step button to the visual bottom of #steps-container.
   JS uses appendChild so new cards land after it in the DOM,
   but order:9999 keeps it rendering last in the flex column. */
#add-step-btn {
  order: 9999;
  margin: 4px 0 4px;
}

/* Override margin when add-btn lives inside the controls bar */
.panel2-controls .add-btn {
  margin: 0;
  align-self: center;
}

/* ════════════════════════════
   STEP CARDS
════════════════════════════ */
#steps-container {
  flex: 1;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow-y: auto;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-1);
  border-left: 2px solid var(--border-2);
  border-radius: var(--r);
  padding: 9px 10px;
  transition: border-left-color 0.15s;
}

.step-card:hover {
  border-left-color: var(--accent-muted);
}

#step-0 {
  border-left-color: var(--accent-muted);
}

.step-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--border-0);
}

.step-label {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1.5px;
  color: var(--text-acc);
  text-transform: uppercase;
}

.step-header-right {
  display: flex;
  align-items: center;
  gap: 4px;
}

.step-collapse-btn {
  padding: 1px 6px;
  font-size: 9px;
  border-color: var(--border-2);
  color: var(--text-mid);
  background: transparent;
  letter-spacing: 0;
}

.step-collapse-btn:hover {
  border-color: var(--accent-muted);
  color: var(--text-acc);
  background: var(--accent-dim);
  box-shadow: none;
}

.step-eye-btn {
  padding: 2px 5px;
  border-color: var(--border-2);
  color: var(--text-lo);
  background: transparent;
  letter-spacing: 0;
  line-height: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.step-eye-btn:hover {
  border-color: var(--accent-muted);
  color: var(--accent-muted);
  background: var(--accent-dim);
  box-shadow: none;
}

.step-eye-btn.eye-active {
  border-color: var(--accent-muted);
  color: var(--accent);
  background: var(--accent-dim);
}

.step-eye-btn.eye-active:hover {
  border-color: var(--accent);
  color: var(--accent-hi);
  background: var(--accent-glow);
}

.step-card.collapsed .step-type-row,
.step-card.collapsed .step-fields {
  display: none;
}

.step-delete {
  padding: 1px 6px;
  font-size: 14px;
  line-height: 1;
  font-weight: 400;
  border-color: #9a3232;
  color: #c94444;
  background: transparent;
}

.step-delete:hover {
  background: var(--danger-dim);
  border-color: #c94444;
  color: #e06060;
  box-shadow: none;
}

/* ── Form fields ── */
.step-fields {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.step-fields label {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 1.3px;
  color: var(--text-lo);
}

.step-fields input,
.step-fields select {
  font-family: var(--mono);
  font-size: 11px;
  padding: 5px 8px;
  border: 1px solid var(--border-1);
  background: var(--bg-input);
  color: var(--text-hi);
  border-radius: var(--r);
  outline: none;
  transition: border-color 0.12s, box-shadow 0.12s;
}

.step-fields input:focus,
.step-fields select:focus {
  border-color: var(--accent-muted);
  box-shadow: 0 0 0 2px var(--accent-dim);
}

.step-fields select {
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' fill='none'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23607a90' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  padding-right: 24px;
}

/* ── Step type row ── */
.step-type-row {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 9px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--border-0);
}

.step-type-row span {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 1.5px;
  color: var(--text-lo);
  text-transform: uppercase;
}

.step-type-row select {
  font-family: var(--mono);
  font-size: 11px;
  padding: 4px 24px 4px 8px;
  border: 1px solid var(--border-1);
  background: var(--bg-input);
  color: var(--text-hi);
  border-radius: var(--r);
  outline: none;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' fill='none'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23607a90' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  transition: border-color 0.12s;
}

.step-type-row select:focus {
  border-color: var(--accent-muted);
  box-shadow: 0 0 0 2px var(--accent-dim);
}

/* ════════════════════════════
   PANEL 2 — MASKS
════════════════════════════ */
.panel2-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 10px;
  height: 36px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border-1);
  background: var(--bg-surface);
}

.width-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 1.3px;
  color: var(--text-lo);
}

.width-label input {
  font-family: var(--mono);
  font-size: 11px;
  width: 78px;
  padding: 4px 8px;
  border: 1px solid var(--border-1);
  background: var(--bg-input);
  color: var(--text-hi);
  border-radius: var(--r);
  outline: none;
  transition: border-color 0.12s, box-shadow 0.12s;
}

.width-label input:focus {
  border-color: var(--accent-muted);
  box-shadow: 0 0 0 2px var(--accent-dim);
}

/* Mask entry form */
.mask-entry {
  display: flex;
  gap: 5px;
  align-items: center;
  padding: 6px 10px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-1);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.mask-entry.hidden { display: none; }

.mask-entry input {
  font-family: var(--mono);
  font-size: 11px;
  padding: 5px 8px;
  border: 1px solid var(--border-1);
  background: var(--bg-input);
  color: var(--text-hi);
  border-radius: var(--r);
  outline: none;
  transition: border-color 0.12s, box-shadow 0.12s;
}

.mask-entry input:focus {
  border-color: var(--accent-muted);
  box-shadow: 0 0 0 2px var(--accent-dim);
}

.mask-entry input::placeholder {
  color: var(--text-lo);
  font-style: italic;
}

#mask-definition  { flex: 2; min-width: 140px; }
#mask-name-input  { flex: 1; min-width: 80px; }

/* Mask list */
#mask-list-container {
  flex: 1;
  display: flex;
  flex-direction: column;          /* mask row, then entry + Add Mask button below the masks */
  overflow-y: auto;
  overflow-x: hidden;
}

/* The canvas + per-mask controls column sit side by side in their own row. */
#mask-row {
  display: flex;
  position: relative;
  flex-shrink: 0;
}

/* Add Mask button below the masks, left-aligned (mirrors Panel 1's + Add Step). */
#add-mask-btn {
  margin: 8px 10px;
}

#mask-canvas {
  flex: 1;
  display: block;
}

#mask-controls-col {
  width: 165px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg-input);
  border-left: 1px solid var(--border-1);
  overflow-y: auto;
}

.mask-ctrl-row {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 7px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border-0);
}

.mask-ctrl-row .mask-name-label {
  flex: 1;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1px;
  color: var(--text-acc);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mask-ctrl-row button {
  padding: 2px 5px;
  font-size: 11px;
  min-width: 22px;
  letter-spacing: 0;
}

.btn-del {
  padding: 1px 5px;
  font-size: 14px;
  line-height: 1;
  font-weight: 400;
  border-color: #9a3232;
  color: #c94444;
  background: transparent;
  letter-spacing: 0;
}
.btn-del:hover {
  background: var(--danger-dim);
  border-color: #c94444;
  color: #e06060;
  box-shadow: none;
}

.btn-edit {
  padding: 3px 5px;
  line-height: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-color: var(--border-2);
  color: var(--text-mid);
  background: transparent;
  letter-spacing: 0;
}
.btn-edit:hover {
  border-color: var(--accent-muted);
  color: var(--text-acc);
  background: var(--accent-dim);
  box-shadow: none;
}

.btn-up,
.btn-dn {
  border-color: var(--border-2);
  color: var(--text-mid);
}

/* ════════════════════════════
   PANEL 3 — VISUALIZER
════════════════════════════ */
#panel3-body {
  flex: 1;
  display: flex;
  flex-direction: row;
  overflow: hidden;
  position: relative;
}

/* Ruler measurement overlay canvas */
#p3-ruler-overlay {
  position: absolute;
  pointer-events: none;
  z-index: 20;
  display: block;
}

/* Rubber-band selection overlay */
#p3-sel-overlay {
  position: absolute;
  display: none;
  border: 1.5px dashed var(--accent);
  background: var(--accent-dim);
  box-sizing: border-box;
  pointer-events: none;
  z-index: 10;
}

#three-canvas {
  flex: 1;
  display: block;
  min-width: 0;
}

/* Sidebar — mirrors mask-controls-col width exactly */
#p3-sidebar {
  width: 165px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg-input);
  border-left: 1px solid var(--border-1);
  overflow-y: auto;
  position: relative;
}

/* Legend — lives inside #p3-sidebar */
#legend {
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  flex: 1;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.5px;
  color: var(--text-mid);
  padding: 5px 0;
  border-bottom: 1px solid var(--border-0);
}

.legend-item > span {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.legend-swatch-canvas {
  display: block;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 2px;
  cursor: pointer;
  flex-shrink: 0;
  transition: box-shadow 0.1s, border-color 0.1s;
}

.legend-swatch-canvas:hover {
  border-color: var(--accent-muted);
  box-shadow: 0 0 0 1px var(--accent-muted);
}

/* ── Legend editor popup ──────────────────── */

.legend-editor-popup {
  position: absolute;
  z-index: 200;
  background: var(--bg-panel);
  border: 1px solid var(--border-2);
  border-radius: 4px;
  padding: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
  min-width: 110px;
}

.lep-color-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
}

.lep-color-swatch {
  display: block;
  border: 1px solid var(--border-1);
  border-radius: 2px;
  cursor: pointer;
  flex-shrink: 0;
}

.lep-color-swatch:hover {
  border-color: var(--accent-muted);
}

.lep-label, .lep-pat-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.5px;
  color: var(--text-dim);
  text-transform: uppercase;
}

.lep-pat-label {
  margin-bottom: 4px;
}

.lep-patterns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
}

.lep-pattern-tile {
  display: block;
  border: 1px solid var(--border-1);
  border-radius: 2px;
  cursor: pointer;
  transition: border-color 0.1s;
}

.lep-pattern-tile:hover {
  border-color: var(--accent-muted);
}

.lep-pattern-tile-active {
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 1px var(--accent);
}

/* ════════════════════════════
   UTILITIES
════════════════════════════ */

/* Scrollbars */
::-webkit-scrollbar           { width: 4px; height: 4px; }
::-webkit-scrollbar-track     { background: var(--bg-void); }
::-webkit-scrollbar-thumb     { background: var(--border-2); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-muted); }

/* Number spin buttons */
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button { opacity: 0.25; }

/* Text selection */
::selection { background: var(--accent-dim); color: var(--text-acc); }

/* Input placeholder */
input::placeholder { color: var(--text-lo); font-style: italic; }

/* ════════════════════════════
   ETCH PARAMS ROW
════════════════════════════ */

/* Compact horizontal row: 1 or 3 param groups side by side */
.etch-params-row {
  display: flex;
  gap: 6px;
}

/* Each param group = label + input stacked; inherits .step-fields label styles */
.etch-param-group {
  flex: 1;
  min-width: 0;
}

/* MASK + MASK BIAS side-by-side row */
.etch-mask-row {
  display: flex;
  gap: 6px;
}

.etch-mask-col {
  flex: 2;
  min-width: 0;
  align-items: center;   /* center label text over the select */
}

.etch-bias-col {
  flex: 1;
  min-width: 0;
  align-items: center;   /* center label text over the input */
}

/* Re-expand inputs/selects to full col width after centering */
.etch-mask-row select,
.etch-mask-row input {
  width: 100%;
}

/* ════════════════════════════
   ETCH TARGETS
════════════════════════════ */
.etch-targets-section {
  margin-top: 4px;
  padding-top: 8px;
  border-top: 1px solid var(--border-0);
}

/* Add button row — right-aligned above column headers */
.etch-add-row {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 3px;
}

.add-target-btn {
  padding: 2px 8px;
  font-size: 9px;
  letter-spacing: 0.5px;
}

/* Column headers — mirrors .etch-target-row flex layout exactly */
.etch-col-headers {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 4px;
}

.etch-col-label {
  font-family: var(--mono);
  font-size: 8px;
  font-weight: 500;
  letter-spacing: 0.8px;
  color: var(--text-lo);
  text-align: center;
}

.etch-col-material { flex: 2; }
.etch-col-rate     { flex: 1; min-width: 55px; }

/* Invisible clone of the delete button — keeps headers aligned */
.etch-phantom {
  visibility: hidden;
  pointer-events: none;
}

.etch-targets-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.etch-target-row {
  display: flex;
  align-items: center;
  gap: 5px;
}

.etch-target-material {
  flex: 2;
}

.etch-target-rate {
  flex: 1;
  min-width: 55px;
}

.etch-target-del {
  flex-shrink: 0;
  padding: 2px 6px;
  font-size: 10px;
  border-color: var(--danger);
  color: var(--danger);
  background: transparent;
  letter-spacing: 0;
}

.etch-target-del:hover {
  background: var(--danger-dim);
  border-color: #e05050;
  color: #ff6060;
  box-shadow: none;
}

/* ════════════════════════════
   DEPOSIT PARAMS ROW
════════════════════════════ */
.deposit-params-row {
  display: flex;
  gap: 6px;
}

/* Each group = label text centered above a full-width input */
.deposit-param-group {
  flex: 1;
  min-width: 0;
  text-align: center;
}

.deposit-param-group input {
  width: 100%;
}

/* ════════════════════════════
   GROW TARGETS
════════════════════════════ */
.grow-targets-section {
  margin-top: 4px;
  padding-top: 8px;
  border-top: 1px solid var(--border-0);
}

.grow-add-row {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 3px;
}

.grow-col-headers {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 4px;
}

/* Wider column for the material dropdown */
.grow-col-into { flex: 2; text-align: center; }
/* Equal columns for the two numeric inputs */
.grow-col-num  { flex: 1; min-width: 50px; text-align: center; }

.grow-targets-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.grow-target-row {
  display: flex;
  align-items: center;
  gap: 5px;
}

.grow-target-into { flex: 2; }
.grow-target-num  { flex: 1; min-width: 50px; }

/* ── Error highlighting ───────────────────────────────────────────────────── */

.step-card.step-error {
  border-color: var(--danger);
  box-shadow: 0 0 0 1px var(--danger);
}

.step-card.step-error .step-header {
  background: var(--danger-dim);
}

[data-field].field-error {
  outline: 1px solid var(--danger);
  background: var(--danger-dim);
  border-radius: 3px;
}