:root {
  --bg: #f4f3ef;
  --panel: #ffffff;
  --ink: #1d1d1f;
  --muted: #6b6b70;
  --line: #dcdad3;
  --paper: #ffffff;
  --paper-edge: #cfcac0;
  --pen: #1f3a93;
  --travel: #e0564a;
  --accent: #1f3a93;
  --accent-ink: #ffffff;
  --err: #b3261e;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181b; --panel: #202226; --ink: #ececef; --muted: #9a9aa2; --line: #34363c;
    --paper: #2a2c31; --paper-edge: #44474f; --pen: #8fb0ff; --travel: #ff8a80;
    --accent: #8fb0ff; --accent-ink: #10131a; --err: #ff8a80; color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg); color: var(--ink);
  font: 15px/1.35 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
}
button, input { font: inherit; color: inherit; }

.app {
  height: 100dvh;
  display: grid;
  grid-template-columns: 1fr 320px;
}
.stage { position: relative; min-width: 0; min-height: 0; }
#preview { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.drop-hint {
  position: absolute; inset: 12px; border: 2px dashed var(--accent); border-radius: 12px;
  display: none; align-items: center; justify-content: center; color: var(--accent); font-weight: 600;
  background: color-mix(in srgb, var(--bg) 70%, transparent);
}
.stage.dragging .drop-hint { display: flex; }

/* move, turn, crop (js/place.js) */
#preview { touch-action: none; }
.stage.movable #preview { cursor: grab; }
.stage.movable #preview:active { cursor: grabbing; }
.stage.cropping #preview { cursor: crosshair; }
.placebar { position: absolute; top: 10px; left: 10px; display: flex; gap: 6px; }
.placebar .btn.sm { padding: 6px 12px; }
.placebar .btn[hidden] { display: none; }
.placebar .btn.on { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

.panel {
  background: var(--panel); border-left: 1px solid var(--line);
  padding: 16px; display: flex; flex-direction: column; gap: 14px; overflow-y: auto;
}
.top { display: flex; align-items: center; justify-content: space-between; }
h1 { font-size: 18px; margin: 0; }
h2 { font-size: 17px; margin: 0; }
h3 { font-size: 14px; margin: 14px 0 6px; color: var(--muted); font-weight: 600; }

.row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 9px 14px; border-radius: 9px; border: 1px solid var(--line); background: var(--panel);
  cursor: pointer; font-weight: 600; transition: transform .08s, background .15s;
}
.btn:active { transform: scale(.97); }
.btn:hover { background: color-mix(in srgb, var(--accent) 8%, var(--panel)); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); width: 100%; padding: 12px; }
.btn[disabled] { opacity: .45; cursor: default; transform: none; }
.link { background: none; border: 0; padding: 0; color: var(--accent); cursor: pointer; text-decoration: underline; }
.samples { color: var(--muted); font-size: 14px; }
.icon { background: none; border: 0; padding: 6px; border-radius: 8px; cursor: pointer; color: var(--muted); font-size: 18px; line-height: 1; }
.icon:hover { color: var(--ink); background: var(--bg); }

.panel > * { flex-shrink: 0; }   /* the panel scrolls instead of squashing its rows */
.file { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hint { color: var(--muted); font-weight: 400; font-size: 13px; }
.slider .q { margin-right: auto; margin-left: 6px; }
.stats { color: var(--muted); font-size: 14px; min-height: 1.35em; }
.err { color: var(--err); margin: 0; font-size: 14px; min-height: 1.35em; }

.slider { display: flex; flex-direction: column; gap: 4px; }
.slider span { display: flex; justify-content: space-between; color: var(--muted); font-size: 14px; }
.slider b { color: var(--ink); }
input[type=range] { width: 100%; accent-color: var(--accent); }

/* tool panels (js/tool.js): the open tool replaces the rest of the panel */
.panel.tooling > :not(.tool) { display: none; }
.tool { display: flex; flex-direction: column; gap: 12px; }
.tool[hidden] { display: none; }
.tool .top .btn { padding: 6px 14px; }

/* text + pattern tools */
#textInput {
  font: 16px/1.35 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--ink); resize: none;
  padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); width: 100%;
}
.tool .seg button { flex: 1 1 auto; padding: 7px 6px; }
.pattern-sliders { display: flex; flex-direction: column; gap: 12px; min-height: 166px; }  /* room for 3 sliders, so switching type doesn't resize the panel */

/* plotter controls */
.machine { display: flex; flex-direction: column; gap: 10px; border-top: 1px solid var(--line); padding-top: 14px; }
.machine[hidden], .machine [hidden] { display: none; }
.btn.wide { flex: 1; }
.btn.sm { padding: 6px 0; font-size: 14px; }
.live { display: flex; flex-direction: column; gap: 10px; }
.mstatus { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.mstatus #mPos { color: var(--muted); flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); flex: none; }
.dot[data-state=Idle] { background: #2e9d52; }
.dot[data-state=Run], .dot[data-state=Jog] { background: var(--accent); }
.dot[data-state=Hold] { background: #d99a1e; }
.dot[data-state=Alarm] { background: var(--err); }
.pad { display: grid; grid-template-columns: 44px repeat(4, 1fr); gap: 6px; align-items: center; }
.pad .lbl { color: var(--muted); font-size: 14px; }
.pad .span2 { grid-column: span 2; }
.seg { grid-column: span 2; display: flex; border: 1px solid var(--line); border-radius: 9px; overflow: hidden; }
.seg button { flex: 1; border: 0; background: var(--panel); padding: 6px 0; font-size: 14px; cursor: pointer; }
.seg button + button { border-left: 1px solid var(--line); }
.seg button.on { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
.run { display: flex; flex-direction: column; gap: 8px; }
.run .row { flex-wrap: nowrap; }
.run #runText { flex: 1; color: var(--muted); font-size: 14px; }
.run .btn.sm { padding: 6px 14px; }
.bar { height: 8px; border-radius: 4px; background: var(--line); overflow: hidden; }
.bar span { display: block; height: 100%; width: 0; background: var(--accent); transition: width .25s; }
.mmsg { margin: 0; font-size: 14px; color: var(--muted); min-height: 1.35em; }
.plotrow { flex-wrap: nowrap; gap: 8px; }
.plotrow .btn { flex: 1; width: auto; padding: 12px; }
.swatch { display: inline-block; width: 12px; height: 12px; border-radius: 3px; border: 1px solid var(--line); vertical-align: -1px; }
.mmsg.bad { color: var(--err); }
.panel.connected #download { background: var(--panel); color: var(--ink); border-color: var(--line); padding: 9px; }
#cmd { flex: 1; min-width: 0; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); font-family: ui-monospace, Consolas, monospace; }
#cmdForm { margin-top: 4px; flex-wrap: nowrap; }
.log { margin: 8px 0 0; height: 120px; overflow-y: auto; background: var(--bg); border-radius: 8px; padding: 8px; font-size: 12px; white-space: pre-wrap; color: var(--muted); }
/* calibrate tool (js/calibrate.js) */
#calTool { flex: 1; }
.calstep { display: flex; flex-direction: column; gap: 10px; }
.calstep[hidden] { display: none; }
.calstep h3 { margin: 0; }
.calstep .grid { margin-top: 0; }
.calstep .switch { margin-top: 0; }
.calstep .help { margin: 0; }
.calvals { display: grid; grid-template-columns: auto auto 1fr; gap: 6px 10px; font-size: 14px; align-items: baseline; }
.calvals span:not(.unit) { color: var(--muted); }
.calres { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--muted); }
.calres b { color: var(--ink); }
.calres span { white-space: nowrap; }
.calstep > .link { align-self: flex-start; font-size: 14px; }
.calres > span:first-child { flex: none; }
.calres .btn.sm { padding: 6px 14px; }
.calres .end { margin-left: auto; }
.calstep .row .btn { padding-left: 8px; padding-right: 8px; }
.calres .seg { flex: 1; }
.calres input, .calstep select { width: 80px; padding: 6px 8px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--ink); font: inherit; }
.calstep .grid select { width: 100%; padding: 8px 10px; }
.calz { min-width: 3ch; font-variant-numeric: tabular-nums; }
.calsay { margin: 0; font-size: 14px; color: var(--muted); min-height: 1.35em; }
.calnav { display: flex; align-items: center; gap: 10px; margin-top: auto; }
.calnav span { flex: 1; text-align: center; color: var(--muted); font-size: 14px; }
.mstatus .link { font-size: 14px; }

/* settings sheet */
.sheet {
  position: fixed; inset: 0; background: rgb(0 0 0 / .35);
  display: flex; align-items: center; justify-content: center; padding: 16px; z-index: 10;
}
.sheet[hidden] { display: none; }
.sheet-card {
  background: var(--panel); border-radius: 14px; padding: 16px; width: min(440px, 100%);
  max-height: 100%; overflow-y: auto; animation: rise .18s ease-out;
}
@keyframes rise { from { transform: translateY(16px); opacity: 0; } }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 12px; }
.grid label { display: flex; flex-direction: column; gap: 4px; font-size: 14px; color: var(--muted); }
.lbl { display: flex; align-items: center; gap: 5px; white-space: nowrap; }
.unit { font-size: 12px; }
.grid input {
  padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--ink); width: 100%;
}
.q {
  width: 18px; height: 18px; border-radius: 50%; border: 1px solid var(--line); background: none;
  font-size: 11px; line-height: 1; padding: 0; cursor: pointer; color: var(--muted); vertical-align: 1px;
}
.help { font-size: 13px; color: var(--muted); margin: 6px 0 0; }

.pick { display: flex; flex-direction: column; gap: 6px; margin-top: 12px; font-size: 14px; }

.switch { display: flex; align-items: center; gap: 10px; margin-top: 12px; cursor: pointer; font-size: 14px; }
.switch input { position: absolute; opacity: 0; pointer-events: none; }
.switch > span {
  width: 38px; height: 22px; border-radius: 11px; background: var(--line); position: relative; flex: none; transition: background .15s;
}
.switch > span::after {
  content: ""; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; border-radius: 50%;
  background: #fff; transition: transform .15s;
}
.switch input:checked + span { background: var(--accent); }
.switch input:checked + span::after { transform: translateX(16px); }
.switch input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }

/* phone: preview on top, controls below, no page scroll */
@media (max-width: 760px) {
  .app { grid-template-columns: 1fr; grid-template-rows: minmax(0, 1fr) auto; }
  .panel { border-left: 0; border-top: 1px solid var(--line); padding: 12px 16px calc(12px + env(safe-area-inset-bottom)); gap: 10px; overflow: visible; }
  /* plotter controls or a tool panel: the panel scrolls inside so the preview keeps its space */
  .panel.connected, .panel.tooling { max-height: 58dvh; overflow-y: auto; }
  .stats, .err { font-size: 13px; }
}