:root {
  --bg: var(--ctx-color-background, #0D1117);
  --panel: var(--ctx-color-surface, #131A22);
  --panel-2: var(--ctx-color-surface-2, #18212C);
  --border: var(--ctx-color-border, #2A3645);
  --text: var(--ctx-color-primary-text, #E8EEF5);
  --muted: var(--ctx-color-muted-text, #A6B3C2);
  --accent: var(--ctx-color-brand-accent, #14B8A6);
  --accent-2: #3d78c2;
  --error: var(--ctx-color-error, #EF4444);
  --warn: var(--ctx-color-warning, #F59E0B);
  --ok: var(--ctx-color-success, #22C55E);
  --canvas-bg: #10151c;
  --canvas-grid: #1c242f;
  --canvas-tube: #3d78c2;
  --canvas-tube-edge: #6ea8e8;
  --canvas-center: #e8eef6;
  --canvas-dim: #9db2c9;
  --canvas-badge: #e0a93c;
  --canvas-badge-text: #141414;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font: 14px/1.45 system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
}

header.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; letter-spacing: 0.02em; }
.brand .cx { color: var(--accent); }
.brand .tier { color: var(--ok); font-size: 12px; vertical-align: super; }
.brand small { color: var(--muted); font-weight: 400; margin-left: 8px; }
.tabs { display: flex; gap: 4px; margin-left: 16px; }
.tab-btn {
  background: none;
  border: 1px solid transparent;
  color: var(--muted);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
}
.tab-btn.active { background: var(--panel-2); color: var(--text); border-color: var(--border); }
.topbar .spacer { flex: 1; }
.topbar select, .topbar button, .topbar label.file-btn {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 13px;
  cursor: pointer;
}
.topbar button.primary { background: var(--accent); color: #141414; border-color: var(--accent); font-weight: 600; }
.topbar input[type="file"] { display: none; }

main.layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  grid-template-rows: minmax(320px, 52vh) auto;
  gap: 12px;
  padding: 12px 16px 24px;
}
@media (max-width: 900px) {
  main.layout { grid-template-columns: 1fr; grid-template-rows: auto; }
}

section.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  overflow: auto;
}
section.panel h2 {
  margin: 0 0 10px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

#designer { grid-row: 1 / 3; }
#production, #library-panel { grid-column: 1 / -1; }

.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 10px; margin-bottom: 14px; }
.field-grid label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--muted); }
.field-grid label.wide { grid-column: 1 / -1; }
input, select {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 8px;
  font-size: 13px;
  width: 100%;
}
input:focus, select:focus { outline: 1px solid var(--accent-2); }

table.segments { width: 100%; border-collapse: collapse; }
table.segments td { padding: 4px 6px; vertical-align: middle; }
table.segments td:first-child { white-space: nowrap; font-size: 12px; color: var(--muted); }
table.segments input[type="number"] { width: 72px; }
table.segments select { width: 150px; }
tr.row-bend { background: var(--panel-2); }
.bend-chip {
  background: var(--accent);
  color: #141414;
  font-weight: 700;
  font-size: 11px;
  border-radius: 10px;
  padding: 2px 8px;
}
.hint { font-size: 11px; color: var(--muted); }
.btn-ghost {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
}
.btn-ghost:hover { color: var(--error); }
#add-bend {
  margin-top: 10px;
  width: 100%;
  background: var(--panel-2);
  color: var(--text);
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 8px;
  cursor: pointer;
}
#add-bend:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
#add-bend:disabled { opacity: 0.5; cursor: default; }

#viewer { display: flex; flex-direction: column; padding: 8px; }
#preview { flex: 1; width: 100%; height: 100%; min-height: 280px; border-radius: 8px; cursor: grab; }
#preview:active { cursor: grabbing; }
.view-bar { display: flex; align-items: center; gap: 6px; padding: 2px 4px 8px; }
.view-bar button {
  background: var(--panel-2);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 10px;
  font-size: 12px;
  cursor: pointer;
}
.view-bar button:hover { color: var(--text); border-color: var(--accent-2); }
.view-bar .hint { margin-left: auto; }

.xyz-box { margin-top: 14px; border-top: 1px solid var(--border); padding-top: 10px; }
.xyz-box summary { cursor: pointer; color: var(--muted); font-size: 13px; }
.xyz-box textarea {
  width: 100%;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  font: 12px/1.5 ui-monospace, monospace;
  margin: 8px 0;
}
.xyz-box button {
  background: var(--accent-2);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
}

.lib-section { margin-bottom: 20px; }
.lib-section h3 { margin: 0 0 6px; font-size: 14px; color: var(--accent); }
table.lib-table { border-collapse: collapse; width: 100%; }
table.lib-table th { text-align: left; font-size: 11px; color: var(--muted); padding: 4px 6px; font-weight: 500; }
table.lib-table td { padding: 2px 4px; }
table.lib-table input { width: 100%; min-width: 60px; }
table.lib-table td:first-child input { min-width: 160px; }
.lib-add {
  margin-top: 6px;
  background: var(--panel-2);
  color: var(--muted);
  border: 1px dashed var(--border);
  border-radius: 6px;
  padding: 5px 12px;
  font-size: 12px;
  cursor: pointer;
}
.lib-add:hover { color: var(--accent); border-color: var(--accent); }

#production h3, #production-out h3 { margin: 14px 0 6px; font-size: 13px; color: var(--accent); }
.prod-grid { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .prod-grid { grid-template-columns: 1fr 1fr; } }
#production-out table.marks th { text-transform: none; letter-spacing: 0; font-size: 13px; width: 60%; }

#results .cut {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}
#cut-length { font-size: 26px; font-weight: 700; color: var(--ok); }
#cut-length-frac { color: var(--muted); font-size: 13px; }

table.marks { width: 100%; border-collapse: collapse; font-size: 13px; }
table.marks th, table.marks td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--border); }
table.marks th { color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; }
.frac { color: var(--muted); }

.problem { border-radius: 6px; padding: 6px 10px; margin-bottom: 6px; font-size: 13px; }
.problem.error { background: rgba(224, 92, 75, 0.12); color: var(--error); border: 1px solid rgba(224, 92, 75, 0.4); }
.problem.warn { background: rgba(224, 169, 60, 0.1); color: var(--warn); border: 1px solid rgba(224, 169, 60, 0.35); }

.flash {
  position: fixed;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--ok);
  color: #10241a;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 8px;
  opacity: 0;
  transition: 0.25s;
  pointer-events: none;
}
.flash.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.flash.error { background: var(--error); color: #fff; }

.card-head { display: none; }

/* ---------- design import ---------- */
.import-row { display: flex; gap: 8px; margin: 10px 0 4px; flex-wrap: wrap; }
.import-row .file-btn, .import-row button {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
}
.import-row .file-btn:hover, .import-row button:hover:not(:disabled) { border-color: var(--accent); }
.import-row button:disabled { opacity: 0.45; cursor: default; }
.import-row input[type="file"] { display: none; }

/* ---------- trace modal ---------- */
.trace-modal {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(5, 8, 12, 0.8);
  display: none;
  align-items: center;
  justify-content: center;
}
.trace-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  max-width: calc(100vw - 24px);
  max-height: calc(100vh - 24px);
  overflow: auto;
}
.trace-bar { display: flex; align-items: center; gap: 10px; padding: 2px 4px 10px; font-size: 13px; flex-wrap: wrap; }
.trace-bar .spacer { flex: 1; }
.trace-bar #trace-hint { color: var(--accent); }
.trace-bar button, .trace-bar input {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 13px;
  cursor: pointer;
}
.trace-bar button.primary { background: var(--accent); color: #141414; border-color: var(--accent); font-weight: 600; }
.trace-canvas { display: block; border-radius: 8px; cursor: crosshair; background: #fff; }

/* ---------- guided tour ---------- */
.tour-overlay { position: fixed; inset: 0; z-index: 200; pointer-events: none; }
.tour-spot {
  position: fixed;
  border: 2px solid var(--accent);
  border-radius: 10px;
  box-shadow: 0 0 0 9999px rgba(5, 8, 12, 0.62);
  transition: all 0.22s ease;
}
.tour-card {
  position: fixed;
  background: var(--panel);
  border: 1px solid var(--accent);
  border-radius: 12px;
  padding: 14px 16px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  pointer-events: auto;
  transition: all 0.22s ease;
}
.tour-step { font-size: 11px; color: var(--accent); letter-spacing: 0.08em; margin-bottom: 4px; }
.tour-card h3 { margin: 0 0 6px; font-size: 15px; }
.tour-card p { margin: 0 0 12px; font-size: 13px; line-height: 1.5; color: var(--text); }
.tour-btns { display: flex; align-items: center; gap: 8px; }
.tour-btns .spacer { flex: 1; }
.tour-btns button {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 12px;
  font-size: 13px;
  cursor: pointer;
}
.tour-btns button.primary { background: var(--accent); color: #141414; border-color: var(--accent); font-weight: 600; }
.tour-btns .tour-skip { background: none; border: none; color: var(--muted); }
.tour-btns .tour-skip:hover { color: var(--error); }
@media print { .tour-overlay { display: none !important; } }

footer.note { padding: 0 16px 20px; color: var(--muted); font-size: 12px; }

/* ---------- print: shop setup sheet ---------- */
@media print {
  body { background: #fff; color: #000; font-size: 12px; }
  header.topbar, #designer, #library-panel, .view-bar, footer.note, .flash { display: none !important; }
  #viewer, #results, #production { display: block !important; }
  main.layout { display: block; padding: 0; }
  #production h3, #production-out h3 { color: #000; }
  .prod-grid label { color: #333; }
  section.panel { border: none; background: #fff; color: #000; padding: 0; margin-bottom: 16px; }
  section.panel h2 { color: #000; }
  .card-head { display: block; margin-bottom: 8px; }
  .card-head h1 { margin: 0 0 4px; font-size: 18px; }
  .card-head p { margin: 0; color: #333; }
  #preview { min-height: 300px; border: 1px solid #ccc; }
  #cut-length { color: #000; }
  table.marks th, table.marks td { border-bottom: 1px solid #999; color: #000; }
  .frac { color: #333; }
  .problem.warn { border: 1px solid #b58a20; color: #7a5c12; background: none; }
}