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

:root {
  /* Royal blue + gold palette */
  --bg-dark:    #060d1c;           /* deep navy canvas */
  --bg-mid:     #0c1528;           /* panel backgrounds */
  --bg-panel:   #0f1c35;           /* sidebars, header */
  --border:     #1a2e52;           /* subtle blue borders */
  --accent:     #f0a500;           /* gold — primary actions, highlights */
  --accent-dim: #c47f00;           /* darker gold on hover */
  --accent2:    #2563eb;           /* royal blue — secondary accents */
  --accent2-dim:#1d4ed8;           /* darker blue on hover */
  --text:       #e8eef8;           /* near-white, blue-tinted */
  --text-dim:   #7a90b8;           /* muted blue-grey */
  --success:    #22c55e;
  --warning:    #fb923c;
  --error:      #ef4444;
  --panel-w:    270px;
  --header-h:   52px;
  --sheet-bar-h:34px;
  --footer-h:   26px;
}

html, body { height: 100%; overflow: hidden; background: var(--bg-dark); color: var(--text); font-family: 'Segoe UI', system-ui, -apple-system, sans-serif; font-size: 13px; line-height: 1.4; }

/* ── App shell ───────────────────────────────────────────────────────────── */

#app {
  display: grid;
  grid-template-rows: var(--header-h) 1fr var(--footer-h);
  height: 100vh;
}

#app-main {
  display: grid;
  grid-template-columns: var(--panel-w) 1fr var(--panel-w);
  overflow: hidden;
  min-height: 0;
}

/* ── Header ──────────────────────────────────────────────────────────────── */

#app-header {
  background: linear-gradient(135deg, #0b1a38 0%, #0f1c35 60%, #0d1528 100%);
  border-bottom: 1px solid var(--accent2);
  display: flex;
  align-items: center;
  padding: 0 14px;
  gap: 18px;
  box-shadow: 0 2px 16px rgba(37,99,235,0.15);
}

#app-header h1 {
  font-size: 16px;
  font-weight: 800;
  /* Gold gradient on the logo text */
  background: linear-gradient(90deg, #f0a500 0%, #ffd24d 50%, #f0a500 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 1.5px;
  white-space: nowrap;
  text-shadow: none;
}

#workflow-tabs { display: flex; gap: 3px; flex: 1; }

/* Workflow tabs: royal-blue active, gold hover */
.tab-btn { background: transparent; border: 1px solid var(--border); color: var(--text-dim); padding: 5px 12px; border-radius: 4px; cursor: pointer; font-size: 12px; transition: all 0.15s; }
.tab-btn:hover { border-color: var(--accent); color: var(--accent); }
.tab-btn.active { background: var(--accent2); border-color: var(--accent2-dim); color: #fff; font-weight: 600; box-shadow: 0 0 8px rgba(37,99,235,0.4); }

/* Unit toggle — gold border, royal blue on hover */
.unit-toggle {
  background: var(--bg-dark);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 5px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  transition: all 0.15s;
  white-space: nowrap;
  flex-shrink: 0;
}
.unit-toggle:hover { background: var(--accent); color: #000; }

/* ── Panels ───────────────────────────────────────────────────────────────── */

aside { background: var(--bg-panel); overflow-y: auto; padding: 12px; }
#left-panel  { border-right: 1px solid var(--border); }
#right-panel { border-left:  1px solid var(--border); }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Typography ──────────────────────────────────────────────────────────── */

/* Section headings: gold text, royal-blue underline */
h2 { font-size: 11px; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: 1.2px; margin: 10px 0 10px; padding-bottom: 5px; border-bottom: 1px solid var(--accent2); }
h3 { font-size: 12px; font-weight: 600; margin: 10px 0 7px; color: var(--text); }

/* ── Forms ───────────────────────────────────────────────────────────────── */

.form-group { margin-bottom: 9px; }
.form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-bottom: 9px; }
.form-row-2 .form-group { margin-bottom: 0; }
.form-group label { display: block; font-size: 11px; color: var(--text-dim); margin-bottom: 3px; }
.form-group input[type="number"],
.form-group input[type="text"],
.form-group select {
  width: 100%; background: var(--bg-dark); border: 1px solid var(--border); color: var(--text); padding: 5px 8px; border-radius: 4px; font-size: 12px; font-family: inherit;
}
/* Focus ring: gold */
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 2px rgba(240,165,0,0.15); }
.form-group label:has(input[type="checkbox"]) { display: flex; align-items: center; gap: 6px; cursor: pointer; color: var(--text); font-size: 12px; }
.form-group input[type="checkbox"] { accent-color: var(--accent); width: 14px; height: 14px; }

/* ── Buttons ─────────────────────────────────────────────────────────────── */

.btn-primary, .btn-secondary, .btn-danger { padding: 6px 12px; border: none; border-radius: 4px; cursor: pointer; font-size: 12px; font-weight: 600; transition: opacity 0.15s, background 0.15s; font-family: inherit; }
/* Primary = gold button, black text for contrast */
.btn-primary   { background: var(--accent); color: #000; font-weight: 700; }
.btn-primary:hover { background: var(--accent-dim); }
/* Secondary = royal-blue border on hover */
.btn-secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--accent2); color: var(--text); }
.btn-danger    { background: transparent; color: var(--error); border: 1px solid var(--error); }
.btn-danger:hover { background: var(--error); color: #fff; }
.btn-row { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
.hidden  { display: none !important; }
.hint    { font-size: 11px; color: var(--text-dim); font-style: italic; line-height: 1.5; }

/* ── Drop zone ───────────────────────────────────────────────────────────── */

#drop-zone { border: 2px dashed var(--border); border-radius: 8px; padding: 20px 10px; text-align: center; cursor: pointer; color: var(--text-dim); transition: all 0.2s; margin-bottom: 12px; font-size: 12px; }
#drop-zone:hover, #drop-zone.dragover { border-color: var(--accent); background: rgba(240,165,0,0.06); color: var(--text); }

/* ── Part / Tool list ────────────────────────────────────────────────────── */

.part-item, .tool-item { background: var(--bg-dark); border: 1px solid var(--border); border-radius: 5px; padding: 7px 9px; margin-bottom: 5px; display: flex; align-items: flex-start; gap: 6px; font-size: 11px; transition: border-color 0.15s; }
.part-item:hover, .tool-item:hover { border-color: var(--accent2); }
.part-info  { flex: 1; min-width: 0; }
.part-name  { font-weight: 600; color: var(--text); margin-bottom: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.part-meta  { color: var(--text-dim); }
.part-color { width: 10px; height: 10px; border-radius: 2px; flex-shrink: 0; margin-top: 3px; }
.item-actions { display: flex; gap: 3px; flex-shrink: 0; }
.item-btn { background: transparent; border: 1px solid var(--border); color: var(--text-dim); padding: 2px 6px; border-radius: 3px; cursor: pointer; font-size: 10px; font-family: inherit; }
.item-btn:hover { border-color: var(--accent2); color: var(--text); }
.item-btn.danger:hover { border-color: var(--error); color: var(--error); }

/* ── Tool folder groups ──────────────────────────────────────────────────── */

.tool-folder-header {
  display: flex; align-items: center; gap: 6px;
  padding: 4px 6px; margin: 6px 0 3px;
  font-size: 10px; font-weight: 700; letter-spacing: 0.8px;
  text-transform: uppercase; color: var(--accent2);
  border-bottom: 1px solid var(--border); cursor: pointer; user-select: none;
}
.tool-folder-header::before { content: '▾'; font-size: 9px; transition: transform 0.15s; }
.tool-folder-header.collapsed::before { transform: rotate(-90deg); }
.tool-folder-items.collapsed { display: none; }

/* ── Hold-down screw legend ─────────────────────────────────────────────── */

.screw-legend { display: flex; align-items: center; gap: 8px; font-size: 11px; color: var(--text-dim); }
.screw-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; border: 1.5px solid; }
.screw-dot.green { background: rgba(34,197,94,0.3); border-color: #22c55e; }
.screw-dot.red   { background: rgba(239,68,68,0.3); border-color: #ef4444; }

/* ── Operation type select (per part) ───────────────────────────────────── */

.op-type-select {
  width: 100%; background: var(--bg-dark); border: 1px solid var(--border);
  color: var(--text-dim); padding: 2px 5px; border-radius: 4px;
  font-size: 10px; font-family: inherit; margin-top: 5px; cursor: pointer;
}
.op-type-select:focus { outline: none; border-color: var(--accent); }
.op-type-select option[value="pocket"]         { color: var(--accent2); }
.op-type-select option[value="pocket+profile"] { color: var(--accent); }

/* ── Mirror pill toggles ─────────────────────────────────────────────────── */

.mirror-row { display: flex; gap: 5px; margin-top: 6px; }
.mirror-pill {
  display: inline-flex; align-items: center; gap: 3px;
  padding: 2px 9px; border-radius: 20px; border: 1px solid var(--border);
  background: var(--bg-mid); color: var(--text-dim); font-size: 11px;
  cursor: pointer; transition: all 0.15s; user-select: none; font-family: inherit;
}
.mirror-pill:hover { border-color: var(--accent2); color: var(--text); }
.mirror-pill.active { background: var(--accent2); border-color: var(--accent2-dim); color: #fff; font-weight: 600; }

/* ── Qty control ─────────────────────────────────────────────────────────── */

.qty-control { display: flex; align-items: center; gap: 5px; margin-top: 4px; }
.qty-control button { background: var(--bg-mid); border: 1px solid var(--border); color: var(--text); width: 18px; height: 18px; border-radius: 3px; cursor: pointer; font-size: 12px; display: flex; align-items: center; justify-content: center; font-family: inherit; }
.qty-control button:hover { border-color: var(--accent); color: var(--accent); }
.qty-control span { font-weight: 600; min-width: 18px; text-align: center; }

/* ── Tool form ───────────────────────────────────────────────────────────── */

#tool-form { background: var(--bg-dark); border: 1px solid var(--border); border-radius: 6px; padding: 11px; margin-top: 9px; }

/* ── Holding Tabs accordion ─────────────────────────────────────────────── */

details#tabs-accordion { border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.accordion-header {
  list-style: none;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  background: var(--bg-dark);
  user-select: none;
  display: flex;
  align-items: center;
  gap: 6px;
}
.accordion-header::before { content: '▶'; font-size: 9px; transition: transform 0.2s; }
details[open] .accordion-header::before { transform: rotate(90deg); }
details[open] .accordion-header { color: var(--text); }
.accordion-header:hover { color: var(--text); }
.accordion-body { padding: 10px; border-top: 1px solid var(--border); }

/* ── Nest stats ──────────────────────────────────────────────────────────── */

#nest-stats { margin-top: 12px; font-size: 11px; }
.stat-row { display: flex; justify-content: space-between; align-items: center; padding: 4px 0; border-bottom: 1px solid var(--border); color: var(--text-dim); }
/* Stat values: gold */
.stat-val { font-weight: 700; color: var(--accent); }

/* ── Tool Operations list ────────────────────────────────────────────────── */

.tool-op-item {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 8px;
  margin-bottom: 5px;
  font-size: 11px;
}
.tool-op-item:hover { border-color: var(--accent2); }

.op-enabled-wrap { flex-shrink: 0; }
.op-enabled-wrap input { accent-color: var(--accent); width: 14px; height: 14px; cursor: pointer; }

.tool-op-select {
  flex: 1;
  background: var(--bg-mid);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 3px 6px;
  border-radius: 3px;
  font-size: 11px;
  font-family: inherit;
  min-width: 0;
}
.tool-op-select:focus { outline: none; border-color: var(--accent); }

.op-pause-wrap { display: flex; align-items: center; gap: 3px; font-size: 10px; color: var(--text-dim); white-space: nowrap; cursor: pointer; flex-shrink: 0; }
.op-pause-wrap input { accent-color: var(--warning); width: 11px; height: 11px; }

/* ── Canvas area ─────────────────────────────────────────────────────────── */

#canvas-container {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-dark);
  position: relative;
}

#canvas-toolbar {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(9,21,45,0.94);
  padding: 5px 9px;
  border-radius: 6px;
  border: 1px solid var(--border);
  backdrop-filter: blur(4px);
}
#canvas-toolbar button { background: transparent; border: 1px solid var(--border); color: var(--text); width: 25px; height: 25px; border-radius: 4px; cursor: pointer; font-size: 15px; display: flex; align-items: center; justify-content: center; transition: border-color 0.15s; }
#canvas-toolbar button:hover { border-color: var(--accent); color: var(--accent); }
#zoom-level  { font-size: 11px; color: var(--text-dim); min-width: 38px; }
#canvas-info { font-size: 11px; color: var(--text-dim); margin-left: 6px; }

#main-canvas { display: block; flex: 1; min-height: 0; }

/* ── Excel-style sheet tab bar ───────────────────────────────────────────── */

#sheet-tab-bar {
  height: var(--sheet-bar-h);
  min-height: var(--sheet-bar-h);
  background: var(--bg-mid);
  border-top: 1px solid var(--accent2);
  display: flex;
  align-items: flex-end;
  padding: 0 6px;
  gap: 2px;
  overflow-x: auto;
  flex-shrink: 0;
}

/* Hide scrollbar on sheet tab bar but keep it scrollable */
#sheet-tab-bar::-webkit-scrollbar { height: 3px; }
#sheet-tab-bar::-webkit-scrollbar-track { background: transparent; }
#sheet-tab-bar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.sheet-tab {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 0 10px;
  height: 27px;
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 4px 4px 0 0;
  cursor: pointer;
  font-size: 11px;
  color: var(--text-dim);
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
  user-select: none;
  flex-shrink: 0;
}
.sheet-tab:hover { background: var(--bg-panel); color: var(--text); }
.sheet-tab.active {
  background: var(--bg-panel);
  border-color: var(--accent);
  border-bottom-color: var(--bg-panel);
  color: var(--accent);
  font-weight: 700;
}
.sheet-tab-label { flex: 1; }
.sheet-tab-close {
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 9px;
  padding: 1px 2px;
  border-radius: 2px;
  line-height: 1;
  opacity: 0.5;
}
.sheet-tab:hover .sheet-tab-close { opacity: 1; }
.sheet-tab-close:hover { color: var(--error); background: rgba(244,67,54,0.15); }

#add-sheet-btn {
  background: transparent;
  border: 1px solid var(--accent2);
  border-bottom: none;
  color: var(--accent2);
  height: 27px;
  padding: 0 10px;
  border-radius: 4px 4px 0 0;
  cursor: pointer;
  font-size: 11px;
  font-weight: 700;
  font-family: inherit;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  align-self: flex-end;
  transition: all 0.15s;
  white-space: nowrap;
  letter-spacing: 0.3px;
}
#add-sheet-btn:hover { background: var(--accent2); color: #fff; }

/* ── Right panel ─────────────────────────────────────────────────────────── */

#gcode-output { width: 100%; height: 340px; background: var(--bg-dark); border: 1px solid var(--border); color: #7aff7a; font-family: 'Courier New', monospace; font-size: 10px; padding: 8px; resize: vertical; border-radius: 4px; }
#selection-info { font-size: 11px; color: var(--text-dim); }
#selection-info p { margin-bottom: 4px; }
#selection-info strong { color: var(--text); }

/* ── Status bar ──────────────────────────────────────────────────────────── */

#status-bar { background: var(--bg-panel); border-top: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; padding: 0 12px; font-size: 11px; color: var(--text-dim); flex-shrink: 0; }
#coord-display { font-family: 'Courier New', monospace; font-size: 11px; color: var(--text-dim); }

/* ── Loading overlay ─────────────────────────────────────────────────────── */

#loading-overlay { position: fixed; inset: 0; background: rgba(10,10,20,0.82); display: flex; align-items: center; justify-content: center; z-index: 1000; flex-direction: column; gap: 14px; backdrop-filter: blur(2px); }
.spinner { width: 38px; height: 38px; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.75s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
#loading-msg { color: var(--text); font-size: 14px; }

/* ── Scrollbars ──────────────────────────────────────────────────────────── */

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }