/* PanPhyMech: layout and interface. Colors map onto the Spectrum tokens in
   /assets/design.css; object colors in the scene carry no data. */

:root {
  --stage: #EEF1F6;
  --stage-grid: rgba(40, 60, 120, 0.06);
  --stage-grid-major: rgba(40, 60, 120, 0.13);
  --stage-axis: rgba(40, 60, 120, 0.28);
  --floor: #DCE1EA;
  --floor-line: #6B7488;
  --link: #4A5466;
  --rope: #9A6B2F;
  --vector: #D6336C;
  --appbar-h: 56px;
  --panel-w: 236px;
  --insp-w: 304px;
  --tool-size: 38px;
  --graph-h: 240px;
  --paper-minor: rgba(28, 40, 90, 0.035);
  --paper-major: rgba(28, 40, 90, 0.075);
}

[data-theme="dark"] {
  --stage: #0E1118;
  --stage-grid: rgba(150, 175, 255, 0.05);
  --stage-grid-major: rgba(150, 175, 255, 0.11);
  --stage-axis: rgba(150, 175, 255, 0.28);
  --floor: #1A1F2A;
  --floor-line: #8A94A8;
  --link: #B5BDCC;
  --rope: #D6A15E;
  --vector: #FF6B9D;
  --paper-minor: rgba(150, 175, 255, 0.03);
  --paper-major: rgba(150, 175, 255, 0.065);
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  overflow: hidden; color: var(--ink); font-family: var(--font-body); -webkit-font-smoothing: antialiased;
  background-color: var(--bg);
  background-image: linear-gradient(var(--paper-major) 1px, transparent 1px), linear-gradient(90deg, var(--paper-major) 1px, transparent 1px),
    linear-gradient(var(--paper-minor) 1px, transparent 1px), linear-gradient(90deg, var(--paper-minor) 1px, transparent 1px);
  background-size: 30px 30px, 30px 30px, 6px 6px, 6px 6px;
}
button, input, select { font: inherit; color: inherit; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.icon { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: 0 0 auto; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

.app { --statusbar-h: 32px; height: 100%; display: flex; flex-direction: column; }

/* ---------- App bar ---------- */

.appbar {
  position: relative; flex: none; display: flex; align-items: center; gap: 14px; z-index: 20;
  min-height: calc(var(--appbar-h) + var(--standalone-top, 0px));
  padding: var(--standalone-top, 0px) max(14px, env(safe-area-inset-right)) 0 max(14px, env(safe-area-inset-left));
  background: var(--surface); border-bottom: 1px solid var(--line);
}
.appbar::after { content: ''; position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; background: var(--spectrum); opacity: 0.85; pointer-events: none; }
.brand { display: inline-flex; align-items: center; gap: 9px; min-width: 0; }
.brand a { display: inline-flex; }
.brand img { display: block; width: 30px; height: 30px; }
.wordmark { margin: 0; font-family: var(--font-display); font-size: 1.02rem; font-weight: 600; letter-spacing: -0.03em; white-space: nowrap; }
.appbar-actions { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.appbar-group { display: flex; align-items: center; gap: 2px; margin-right: 6px; padding-right: 6px; border-right: 1px solid var(--line); }
.atool {
  display: inline-flex; align-items: center; gap: 6px; min-height: 40px; padding: 6px 9px; border: 1px solid transparent; border-radius: 10px;
  background: none; color: var(--ink); text-decoration: none; font-weight: 600; font-size: 0.86rem; white-space: nowrap; cursor: pointer;
}
.atool:hover, .atool[aria-expanded="true"] { background: var(--surface-3); }
.atool .icon { width: 18px; height: 18px; color: var(--accent); }
.atool-quiet { color: var(--ink-2); }
.atool-quiet .icon { color: inherit; }
.atool .icon-chevron { width: 14px; height: 14px; margin-left: -3px; color: var(--ink-3); }
.menu-wrap { position: relative; }
.menu { position: absolute; right: 0; top: calc(100% + 6px); min-width: 230px; padding: 6px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-2); z-index: 50; }
.menu button { display: block; width: 100%; text-align: left; min-height: 40px; padding: 8px 12px; border: 0; border-radius: 8px; background: transparent; cursor: pointer; font-size: 0.9rem; }
.menu button:hover, .menu button:focus-visible { background: var(--accent-soft); }
.menu hr { border: 0; border-top: 1px solid var(--line); margin: 6px 4px; }

/* ---------- Panes ---------- */

.main { flex: 1 1 auto; min-height: 0; display: grid; grid-template-columns: var(--panel-w) minmax(0, 1fr) var(--insp-w); gap: 12px; padding: 12px; }
.pane {
  position: relative; display: flex; flex-direction: column; min-width: 0; min-height: 0;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-1); overflow: hidden;
}
.pane-head { flex: none; display: flex; align-items: center; gap: 12px; min-width: 0; min-height: 54px; padding: 8px 12px 8px 16px; border-bottom: 1px solid var(--line); }
.pane-title { display: flex; flex-direction: column; gap: 1px; min-width: 0; flex: 1; }
.pane-heading { margin: 0; font-family: var(--font-display); font-weight: 500; font-size: 0.98rem; letter-spacing: -0.02em; white-space: nowrap; }
.pane-hint { margin: 0; min-width: 0; font-size: 0.76rem; color: var(--ink-3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.panel-top { display: none; align-items: center; justify-content: space-between; padding: 4px 4px 8px; }
.icon-btn { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 10px; border: 0; background: transparent; cursor: pointer; color: var(--ink-2); }
.icon-btn:hover { background: var(--surface-3); color: var(--ink); }
.icon-btn.panel-close { display: none; }

/* ---------- Parts library ---------- */

.lib-list { flex: 1; overflow-y: auto; padding: 4px 12px 16px; overscroll-behavior: contain; }
.lib-group h3 { margin: 14px 2px 8px; }
.lib-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.part {
  position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; padding: 8px 6px 7px; min-height: 84px; width: 100%;
  border-radius: 12px; border: 1px solid var(--line); background: var(--surface-2); cursor: grab; touch-action: none; user-select: none; -webkit-user-select: none;
  transition: border-color 0.12s, background-color 0.12s;
}
.part:hover { border-color: var(--line-strong); background: var(--surface); }
.part:active { cursor: grabbing; }
.part[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); box-shadow: 0 0 0 2px var(--accent-soft); }
.part svg { width: 64px; height: 44px; overflow: visible; }
.part-name { font-size: 0.78rem; font-weight: 650; text-align: center; line-height: 1.15; color: var(--ink); }
:is(.part, .insp-swatch) .p-stroke { fill: none; stroke: var(--link); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
:is(.part, .insp-swatch) .p-rope { fill: none; stroke: var(--rope); stroke-width: 2.2; stroke-linecap: round; }
:is(.part, .insp-swatch) .p-pin { fill: var(--surface); stroke: var(--link); stroke-width: 1.8; }
:is(.part, .insp-swatch) .p-dot { fill: var(--link); }
:is(.part, .insp-swatch) .p-motor { fill: none; stroke: var(--good); stroke-width: 2; stroke-linecap: round; }
:is(.part, .insp-swatch) .p-motor-head { fill: var(--good); }
:is(.part, .insp-swatch) .p-glue { fill: var(--link); stroke: var(--surface-2); stroke-width: 1.4; stroke-linejoin: round; }
:is(.part, .insp-swatch) .p-pin-dot { fill: var(--surface-2); }
:is(.part, .insp-swatch) .p-mount { fill: var(--surface); stroke: var(--link); stroke-width: 1.5; }
.lib-note { margin: 14px 2px 0; font-size: 0.78rem; line-height: 1.45; color: var(--ink-3); }
.drag-ghost { position: fixed; left: 0; top: 0; width: 64px; height: 44px; pointer-events: none; z-index: 100; opacity: 0.85; filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.25)); }
.drag-ghost svg { width: 100%; height: 100%; overflow: visible; }

/* ---------- Stage ---------- */

.stage-head { gap: 10px; flex-wrap: nowrap; }
.stage-head .pane-heading { margin-right: 4px; }
.run-controls { display: flex; align-items: center; gap: 4px; }
.run-play {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-width: 104px; min-height: 40px; padding: 6px 16px 6px 12px;
  border: 0; border-radius: 999px; background: var(--accent); color: var(--accent-ink); font-weight: 700; font-size: 0.9rem; cursor: pointer;
  box-shadow: 0 2px 10px color-mix(in srgb, var(--accent) 30%, transparent);
}
.run-play:hover { background: var(--accent-hover); }
.run-play[aria-pressed="true"] { background: var(--warn); color: #fff; box-shadow: 0 2px 10px color-mix(in srgb, var(--warn) 30%, transparent); }
[data-theme="dark"] .run-play[aria-pressed="true"] { color: #1A0E00; }
.run-icon { display: inline-grid; place-items: center; width: 16px; height: 16px; }
.run-icon .icon { width: 16px; height: 16px; stroke: none; fill: currentColor; }
/* Fixed width so the running time never shifts the controls. */
.time-readout { flex: none; width: 11ch; font-size: 0.92rem; font-weight: 500; color: var(--ink); text-align: left; white-space: nowrap; }
.speed-select select, .graph-track select { min-height: 36px; border-radius: 9px; border: 1px solid var(--line-strong); background: var(--surface-2); padding: 4px 8px; font-size: 0.84rem; cursor: pointer; }
.speed-select select { font-family: var(--font-mono); }
#btn-show-inspector { margin-left: auto; }

.toolbar { flex: none; display: flex; align-items: center; flex-wrap: wrap; gap: 2px; padding: 5px 8px; background: var(--surface-2); border-bottom: 1px solid var(--line); }
.tool-group { display: flex; gap: 2px; padding-right: 4px; border-right: 1px solid var(--line); flex: 0 0 auto; }
.tool-group:last-of-type { border-right: 0; }
.tool { display: inline-grid; place-items: center; width: var(--tool-size); height: var(--tool-size); border: 1px solid transparent; border-radius: 10px; background: transparent; color: var(--ink-2); cursor: pointer; flex: none; }
.tool:hover:not(:disabled) { background: var(--surface-3); color: var(--ink); }
.tool[aria-pressed="true"], .tool-panel[aria-expanded="true"] { background: var(--accent-soft); color: var(--accent); border-color: color-mix(in srgb, var(--accent) 35%, transparent); }
.tool:disabled { opacity: 0.35; cursor: default; }
.tool-panel { display: none; }
.toolbar-end { display: flex; align-items: center; gap: 2px; margin-left: auto; flex: none; }
#btn-display[aria-expanded="true"] { background: var(--surface-3); }
.display-menu { width: 260px; padding: 10px 14px; }
.tool-clear {
  display: inline-flex; align-items: center; gap: 5px; flex: none; min-height: var(--tool-size); padding: 6px 8px;
  border: 1px solid transparent; border-radius: 10px; background: none; color: var(--danger); font-weight: 600; font-size: 0.86rem; cursor: pointer; white-space: nowrap;
}
.tool-clear .icon { width: 18px; height: 18px; }
.tool-clear:hover:not(:disabled) { background: var(--danger-soft); }
.tool-clear:disabled { opacity: 0.4; cursor: default; }

.workspace { position: relative; flex: 1 1 auto; min-height: 160px; display: flex; flex-direction: column; background: var(--stage); }
.scene-canvas { display: block; width: 100%; height: 0; flex: 1; min-height: 0; touch-action: none; outline: none; user-select: none; -webkit-user-select: none; -webkit-touch-callout: none; }
.scene-canvas:focus-visible { box-shadow: inset 0 0 0 3px var(--focus); }
.run-note {
  position: absolute; left: 12px; bottom: 12px; z-index: 4; max-width: calc(100% - 24px); padding: 5px 10px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-1); color: var(--ink-2); font-size: 0.76rem; pointer-events: none;
}

.empty-state {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); width: min(460px, calc(100% - 32px)); max-height: calc(100% - 24px); overflow-y: auto; padding: 22px 24px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-2); z-index: 4;
}
.empty-state h2 { margin: 0 0 12px; font-size: 1.25rem; }
.empty-state ol { margin: 0 0 12px; padding-left: 1.2rem; display: grid; gap: 6px; color: var(--ink-2); font-size: 0.92rem; line-height: 1.4; }
.empty-state p { margin: 0 0 16px; color: var(--ink-2); font-size: 0.9rem; line-height: 1.45; }
.empty-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- Graph ---------- */

.graph-panel { position: relative; flex: 0 0 var(--graph-h); min-height: 150px; display: flex; flex-direction: column; border-top: 1px solid var(--line); background: var(--surface); }
.graph-resize { position: absolute; left: 0; right: 0; top: -6px; height: 12px; z-index: 5; cursor: row-resize; touch-action: none; }
.graph-resize::after { content: ''; position: absolute; left: 50%; top: 4px; width: 44px; height: 4px; margin-left: -22px; border-radius: 2px; background: var(--line-strong); opacity: 0; transition: opacity 0.15s; }
.graph-resize:hover::after, .graph-resize:focus-visible::after, .graph-resize.is-dragging::after { opacity: 1; background: var(--accent); }
.graph-head { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 10px; padding: 8px 8px 2px 12px; flex: none; }
.graph-track select { max-width: 170px; font-weight: 600; }
.graph-groups { display: inline-flex; padding: 3px; gap: 2px; border-radius: 999px; background: var(--surface-3); border: 1px solid var(--line); }
.graph-groups button { min-height: 30px; padding: 2px 12px; border: 0; border-radius: 999px; background: transparent; color: var(--ink-2); font-weight: 650; font-size: 0.8rem; cursor: pointer; white-space: nowrap; }
.graph-groups button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
.graph-groups button:hover:not([aria-pressed="true"]) { color: var(--ink); }
.graph-legend { flex: none; min-width: 0; min-height: 30px; display: flex; flex-wrap: wrap; align-items: center; gap: 2px 10px; padding: 0 8px 0 12px; font-size: 0.78rem; color: var(--ink-2); font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.legend-item { display: inline-flex; align-items: center; gap: 6px; min-height: 28px; padding: 0 6px; border: 0; border-radius: 8px; background: none; cursor: pointer; white-space: nowrap; font: inherit; color: inherit; }
.legend-item:hover { background: var(--surface-3); }
.legend-item[aria-pressed="false"] { opacity: 0.4; }
.legend-item[aria-pressed="false"] .legend-value { visibility: hidden; }
.legend-label { color: var(--ink); font-family: var(--font-body); font-weight: 600; }
.legend-value { display: inline-block; min-width: 10ch; text-align: right; color: var(--ink); }
.legend-swatch { width: 16px; height: 0; border-top: 3px solid var(--c); border-radius: 2px; }
.legend-swatch.is-dashed { border-top-style: dashed; }
.legend-time { color: var(--ink-3); min-width: 9ch; }
.graph-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-left: auto; }

/* View reset is separate from the export pills. */
.graph-view-button {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px; flex: none;
  min-height: 32px; margin-right: 8px; padding: 0 10px; border: 1px solid var(--line-strong); border-radius: 8px;
  background: transparent; color: var(--ink); font: 600 0.74rem var(--font-body); cursor: pointer; white-space: nowrap;
}
.graph-view-button .icon { width: 16px; height: 16px; }
.graph-view-button:hover:not(:disabled) { background: var(--surface-3); border-color: var(--accent); }
.graph-view-button:focus-visible { outline: 3px solid var(--focus); outline-offset: 1px; }
.graph-view-button:disabled { opacity: 0.45; cursor: default; }

.graph-export-pill {
  display: inline-flex; align-items: center; justify-content: center; min-height: 32px; padding: 0 12px; border: 1px solid var(--line-strong); border-radius: 999px;
  background: var(--surface-2); color: var(--ink); font: 600 0.74rem var(--font-body); cursor: pointer; white-space: nowrap;
}
.graph-export-pill:hover:not(:disabled) { background: var(--surface-3); border-color: var(--accent); }
.graph-export-pill:disabled { opacity: 0.45; cursor: not-allowed; }
.graph-canvas { flex: 1; width: 100%; height: 0; min-height: 0; display: block; }

/* ---------- Status bar ---------- */

.statusbar {
  flex: none; display: flex; align-items: center; gap: 12px; height: calc(var(--statusbar-h) + env(safe-area-inset-bottom, 0px));
  padding: 4px max(14px, env(safe-area-inset-right)) calc(4px + env(safe-area-inset-bottom, 0px)) max(14px, env(safe-area-inset-left));
  border-top: 1px solid var(--line); background: var(--surface-2); font-size: 0.76rem; color: var(--ink-3);
}
.statusbar-status { flex: 1; min-width: 0; display: flex; align-items: center; gap: 12px; }
.hint { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--ink-2); text-align: left; }
.cursor-readout { flex: none; width: 21ch; color: var(--ink-3); text-align: right; }
.zoom-readout { flex: none; width: 9ch; color: var(--ink-3); text-align: right; }

/* ---------- Inspector ---------- */

.inspector { min-width: 0; min-height: 0; display: flex; flex-direction: column; }
.inspector-body { flex: 1; min-height: 0; overflow-y: auto; display: flex; flex-direction: column; gap: 12px; overscroll-behavior: contain; padding-bottom: 2px; }
.icard { flex: none; padding: 14px 16px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-1); }
.icard-label { margin: 0 0 8px; font-family: var(--font-mono); font-weight: 600; font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); }
.readings-card { position: relative; }
.readings-card::before { content: ''; position: absolute; top: -1px; left: var(--radius); right: var(--radius); height: 2px; border-radius: 2px; background: var(--spectrum); opacity: 0.8; pointer-events: none; }
.icard-note { margin: 10px 0 0; font-size: 0.8rem; color: var(--ink-3); line-height: 1.45; }
.insp-head { display: flex; align-items: center; gap: 12px; }
.insp-swatch { width: 40px; height: 40px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 10px; background: var(--surface-2); border: 1px solid var(--line); }
.insp-swatch svg { width: 32px; height: 28px; overflow: visible; }
.insp-head .icard-label { margin: 0 0 2px; }
.insp-name { width: 100%; min-height: 34px; margin: 0 0 0 -6px; padding: 2px 6px; border: 1px solid transparent; border-radius: 8px; background: transparent; font-family: var(--font-display); font-weight: 500; font-size: 1rem; letter-spacing: -0.02em; }
.insp-name:hover { border-color: var(--line); }
.insp-name:focus { border-color: var(--accent); outline: 2px solid var(--focus); background: var(--surface-2); }
.insp-head-text { min-width: 0; flex: 1; }

.field { padding: 8px 0; }
.field + .field, .field + .toggle, .toggle + .field, .toggle + .toggle { border-top: 1px solid var(--line); }
.field-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.field-row > label { min-width: 0; font-size: 0.86rem; font-weight: 600; line-height: 1.25; color: var(--ink); }
.num { flex: 0 0 132px; display: flex; align-items: center; position: relative; }
.num input { width: 100%; min-height: 38px; padding: 6px 44px 6px 10px; border-radius: 9px; border: 1px solid var(--line-strong); background: var(--surface-2); font-family: var(--font-mono); font-size: 0.88rem; font-variant-numeric: tabular-nums; }
.num input:focus { outline: 2px solid var(--focus); border-color: var(--accent); }
.num input[aria-invalid="true"] { border-color: var(--danger); }
.num .unit { position: absolute; right: 10px; font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-3); pointer-events: none; }
.slider { display: block; width: 100%; margin: 6px 0 0; accent-color: var(--accent); height: 28px; cursor: pointer; }
.field-help { margin: 4px 0 0; font-size: 0.76rem; color: var(--ink-3); line-height: 1.4; }
.field:has(input:disabled) { opacity: 0.4; }
.toggle { display: flex; width: 100%; margin: 0; align-items: center; justify-content: space-between; gap: 12px; min-height: 46px; cursor: pointer; font-size: 0.86rem; font-weight: 600; color: var(--ink); }
.toggle input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.toggle-track { display: inline-block; position: relative; width: 40px; height: 24px; border-radius: 999px; background: var(--line-strong); flex: 0 0 auto; transition: background 0.15s; }
.toggle-track::after { content: ''; position: absolute; top: 3px; left: 3px; width: 18px; height: 18px; border-radius: 50%; background: #fff; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3); transition: transform 0.15s; }
.toggle input:checked + .toggle-track { background: var(--accent); }
.toggle input:checked + .toggle-track::after { transform: translateX(16px); }
.toggle input:focus-visible + .toggle-track { outline: 3px solid var(--focus); outline-offset: 2px; }
.select-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 46px; font-size: 0.86rem; font-weight: 600; }
.select-row select { min-height: 36px; border-radius: 9px; border: 1px solid var(--line-strong); background: var(--surface-2); padding: 4px 8px; font-size: 0.84rem; max-width: 60%; }
.preset-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.preset-row + .field { margin-top: 10px; border-top: 1px solid var(--line); }
.preset-row .ds-chip { cursor: pointer; min-height: 32px; padding: 0.3rem 0.7rem; font-size: 0.64rem; }

.readings { margin: 0; display: grid; }
.reading { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; font-size: 0.84rem; padding: 5px 0; border-bottom: 1px solid var(--line); }
.reading:last-child { border-bottom: 0; }
.reading dt { color: var(--ink-2); }
.reading dd { margin: 0; text-align: right; font-size: 0.88rem; white-space: nowrap; }
.reading-sep { height: 6px; border-bottom: 1px solid var(--line); }

.swatches { display: flex; flex-wrap: wrap; gap: 8px; padding: 6px 0 2px; }
.swatch { width: 32px; height: 32px; border-radius: 50%; border: 2px solid var(--c2); background: var(--c); cursor: pointer; }
.swatch[aria-pressed="true"] { box-shadow: 0 0 0 3px var(--surface), 0 0 0 5px var(--accent); }

.mini-actions { display: grid; grid-template-columns: repeat(auto-fit, minmax(56px, 1fr)); gap: 4px; margin-top: 12px; padding-top: 10px; border-top: 1px solid var(--line); }
.mini-tool { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px; min-height: 52px; padding: 6px 0; white-space: nowrap; border: 0; border-radius: 10px; background: none; color: var(--ink-2); font-size: 0.72rem; font-weight: 600; cursor: pointer; }
.mini-tool .icon { width: 18px; height: 18px; color: var(--accent); }
.mini-tool:hover:not(:disabled) { background: var(--surface-3); color: var(--ink); }
.mini-tool[aria-pressed="true"] { background: var(--accent-soft); color: var(--accent); }
.mini-tool.danger, .mini-tool.danger .icon { color: var(--danger); }
.mini-tool.danger:hover { background: var(--danger-soft); }
.btn-secondary { display: inline-flex; align-items: center; justify-content: center; width: 100%; min-height: 40px; margin-top: 8px; border: 1px solid var(--line-strong); border-radius: 9px; background: var(--surface-2); color: var(--ink); font-weight: 600; font-size: 0.84rem; cursor: pointer; }
.btn-secondary:hover { border-color: var(--accent); background: var(--surface-3); }
.insp-hint { flex: none; margin: 0 4px; font-size: 0.8rem; color: var(--ink-3); line-height: 1.45; }

/* ---------- Dialogs and toast ---------- */

.dialog { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); color: var(--ink); padding: 20px 22px; max-width: min(460px, calc(100vw - 24px)); box-shadow: var(--shadow-2); }
.dialog-wide { width: min(900px, calc(100vw - 24px)); max-width: min(900px, calc(100vw - 24px)); max-height: calc(100vh - 48px); }
.dialog::backdrop { background: rgba(8, 12, 24, 0.45); }
.dialog h2 { margin: 0 0 8px; font-size: 1.2rem; }
.dialog-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.dialog-sub { color: var(--ink-2); font-size: 0.9rem; margin: 0 0 14px; }
.dialog p { line-height: 1.45; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }
.danger-fill { background: var(--danger); }
.examples-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 8px; }
.example { position: relative; width: 100%; height: 100%; display: flex; gap: 12px; align-items: flex-start; text-align: left; padding: 12px; border-radius: 12px; border: 1px solid var(--line); background: var(--surface-2); cursor: pointer; }
.example:hover { border-color: var(--accent); }
.example strong { display: block; font-size: 0.92rem; margin-bottom: 3px; }
.example .ex-text { display: block; font-size: 0.8rem; color: var(--ink-2); line-height: 1.4; }
.ex-num { flex: 0 0 28px; height: 28px; display: grid; place-items: center; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font: 700 0.8rem var(--font-mono); }
.toast { position: fixed; left: 50%; bottom: 72px; transform: translateX(-50%); z-index: 200; display: flex; align-items: center; gap: 12px; max-width: min(560px, calc(100vw - 24px));
  padding: 10px 16px; border-radius: 12px; background: var(--ink); color: var(--bg); box-shadow: var(--shadow-2); font-size: 0.86rem; line-height: 1.4; }
.toast-btn { flex: none; border: 0; background: transparent; color: var(--accent-hover); font-weight: 700; cursor: pointer; min-height: 32px; }
[data-theme="dark"] .toast-btn { color: #1550B3; }

/* ---------- Responsive ---------- */

@media (max-width: 1240px) {
  :root { --panel-w: 212px; --insp-w: 288px; }
  .main { gap: 10px; padding: 10px; }
  .stage-head .pane-heading { display: none; }
}

@media (max-width: 1080px) {
  .lib-grid { grid-template-columns: minmax(0, 1fr); }
  .part { flex-direction: row; justify-content: flex-start; min-height: 52px; gap: 10px; padding: 4px 10px; }
  .part svg { width: 48px; height: 34px; }
}

/* Tablets and phones: the scene fills the width; Parts and the inspector slide in over it. */
@media (max-width: 900px) {
  .main { grid-template-columns: minmax(0, 1fr); padding: 8px; }
  .library, .inspector {
    position: fixed; top: calc(var(--appbar-h) + var(--standalone-top, 0px) + 8px); bottom: calc(var(--statusbar-h) + env(safe-area-inset-bottom, 0px) + 8px); z-index: 30; width: min(340px, 88vw);
    box-shadow: var(--shadow-2); transition: transform 0.2s ease; visibility: hidden;
  }
  .library { left: 8px; transform: translateX(-110%); }
  .inspector { right: 8px; transform: translateX(110%); padding: 12px; border-radius: var(--radius); background: var(--bg); border: 1px solid var(--line); }
  body.show-library .library, body.show-inspector .inspector { transform: none; visibility: visible; }
  .lib-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .part { flex-direction: column; justify-content: center; min-height: 84px; }
  .part svg { width: 64px; height: 44px; }
  .icon-btn.panel-close { display: inline-grid; }
  .panel-top { display: flex; }
  .tool-panel { display: inline-grid; }
  :root { --graph-h: 200px; }
}

@media (max-width: 640px) {
  .app { --statusbar-h: 52px; }
  .statusbar { flex-direction: column; align-items: stretch; gap: 2px; }
  .statusbar-status { flex: none; width: 100%; min-height: 18px; }
  .cursor-readout { display: none; }
  .appbar { gap: 8px; }
  .atool span { display: none; }
  .atool .icon-chevron { display: none; }
  .appbar-group { margin-right: 2px; padding-right: 2px; }
  .stage-head { padding-left: 8px; gap: 6px; }
  .run-play { min-width: 0; padding: 6px 12px; }
  .run-label { display: none; }
  .time-readout { width: 9.5ch; font-size: 0.84rem; }
  :root { --graph-h: 300px; }
  .graph-panel { min-height: 300px; }
  .graph-actions { order: 1; width: 100%; margin-left: 0; }
  #graph-close { margin-left: auto; width: 32px; min-width: 32px; height: 32px; }
  .graph-head { gap: 6px; padding: 6px 6px 0 8px; }
  .graph-track select { max-width: 132px; }
  .graph-groups button { padding: 2px 7px; }
  .graph-legend { padding: 0 6px 0 8px; gap: 0 4px; }
  .legend-value { min-width: 0; }
}

@media (max-width: 480px) {
  .stage-head { gap: 4px; padding-right: 8px; }
  .t-prefix { display: none; }
  .time-readout { width: 7ch; }
  .speed-select select { padding: 4px; }
  .run-controls { gap: 0; }
}

@media (max-width: 440px) {
  .wordmark { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .library, .inspector, .toggle-track, .toggle-track::after { transition: none; }
}

/* Quick settings: compact rows beside the object, opened by right-click or touch and hold. */
.quick-settings { position: fixed; z-index: 100; width: min(220px, calc(100vw - 16px)); overflow-y: auto; padding: 6px 8px 8px; border: 1px solid var(--line-strong); border-radius: 10px; background: var(--surface); box-shadow: var(--shadow-2); }
.quick-title { margin: 0 0 2px; padding: 2px 0 4px; border-bottom: 1px solid var(--line); font-family: var(--font-display); font-size: .78rem; font-weight: 500; letter-spacing: -0.02em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.quick-settings .field { padding: 3px 0; }
.quick-settings .field + .field, .quick-settings .field + .toggle, .quick-settings .toggle + .field { border-top: 0; }
.quick-settings .field-row > label, .quick-settings .toggle { min-height: 24px; color: var(--ink-2); font-size: .72rem; font-weight: 500; }
.quick-settings .num { flex: 0 0 86px; }
.quick-settings .num input { min-height: 26px; height: 26px; padding: 2px 34px 2px 6px; border-radius: 6px; font-size: .74rem; }
.quick-settings .num .unit { right: 6px; font-size: .66rem; }
.quick-settings .slider { height: 16px; margin: 2px 0 0; }
.quick-settings .toggle { gap: 8px; }
.quick-settings .toggle-track { width: 30px; height: 18px; }
.quick-settings .toggle-track::after { top: 2px; left: 2px; width: 14px; height: 14px; }
.quick-settings .toggle input:checked + .toggle-track::after { transform: translateX(12px); }

/* Two-way choices such as a motor's direction. */
.choice-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.choice-label { font-size: 0.86rem; font-weight: 600; color: var(--ink); white-space: nowrap; }
.seg { display: inline-flex; padding: 2px; gap: 2px; border-radius: 10px; background: var(--surface-3); border: 1px solid var(--line); }
.seg button { display: inline-flex; align-items: center; gap: 4px; min-height: 34px; padding: 2px 8px; border: 0; border-radius: 8px; background: transparent; color: var(--ink-2); font-size: 0.74rem; font-weight: 650; cursor: pointer; white-space: nowrap; }
.seg button .icon { width: 15px; height: 15px; }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
.seg button:hover:not([aria-pressed="true"]) { color: var(--ink); }
.quick-settings .choice-label { font-size: .72rem; font-weight: 500; color: var(--ink-2); }
.quick-settings .seg button { min-height: 26px; padding: 1px 6px; }
.quick-settings .seg button span { display: none; }

/* Several selected objects. */
.multi-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; counter-reset: pick; }
.multi-list li { display: flex; align-items: center; gap: 8px; min-height: 36px; font-size: 0.86rem; font-weight: 600; counter-increment: pick; }
.multi-list li::before { content: counter(pick); width: 1.4em; color: var(--ink-3); font: 600 0.74rem var(--font-mono); text-align: right; }
.multi-art svg { display: block; width: 36px; height: 25px; }
.multi-tag { margin-left: auto; padding: 1px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font: 600 0.66rem var(--font-mono); letter-spacing: 0.06em; text-transform: uppercase; }

/* Select a time range without scrolling the page on touch screens. */
.graph-canvas { touch-action: none; cursor: crosshair; }
.graph-canvas:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

/* Amber notes match PanPhyCircuits and identify deliberate World drag overrides.
   The notes pill floats in the scene's top-right corner, so it never covers the status text. */
/* Drag model: a full-width segmented choice with the force law beside its heading. */
.drag-fields { padding: 10px 0 4px; }
.field + .drag-fields, .preset-row + .drag-fields, .drag-fields + .field, .drag-fields + .toggle { border-top: 1px solid var(--line); }
.drag-fields > .field { padding-bottom: 0; }
.drag-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; margin-bottom: 8px; }
.drag-law { color: var(--ink-2); font-size: 0.84rem; white-space: nowrap; }
.drag-seg { display: grid; grid-template-columns: repeat(var(--n), minmax(0, 1fr)); gap: 2px; padding: 3px; border-radius: 999px; background: var(--surface-3); border: 1px solid var(--line); }
.drag-seg label { position: relative; display: grid; cursor: pointer; }
.drag-seg input { position: absolute; inset: 0; opacity: 0; margin: 0; cursor: inherit; }
.drag-seg span { display: grid; place-items: center; min-height: 36px; padding: 2px 6px; border: 1.5px solid transparent; border-radius: 999px; color: var(--ink-2); font-size: 0.78rem; font-weight: 650; text-align: center; line-height: 1.15; transition: color 0.15s, background-color 0.15s; }
.drag-seg label:hover span { color: var(--ink); }
/* The chosen option matches the pressed gravity chips: a spectrum outline on a solid fill. */
.drag-seg input:checked + span { color: var(--ink); background: linear-gradient(var(--surface), var(--surface)) padding-box, var(--spectrum) border-box; box-shadow: var(--shadow-1); }
.drag-seg input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 1px; }
.drag-seg.is-compact span { padding: 2px 1px; font-size: 0.72rem; letter-spacing: -0.01em; }
.drag-seg input:disabled + span { opacity: 0.45; cursor: not-allowed; }
.drag-source { margin-top: 10px; }
.drag-source .drag-seg { flex: 0 1 220px; }
.drag-fields .field-help, .drag-override-note { margin-top: 8px; }
.drag-override-note { margin: 8px 0 0; padding: 8px 10px; border-radius: 8px; background: color-mix(in srgb, #F08C00 12%, var(--surface)); color: var(--ink); font-size: 0.8rem; line-height: 1.4; }
.drag-notes-button { position: absolute; top: 10px; right: 10px; z-index: 5; height: 28px; padding: 0 12px; border: 1px solid #F08C00; border-radius: 999px; background: var(--surface); color: var(--ink); box-shadow: var(--shadow-1); font: inherit; font-size: 0.76rem; font-weight: 700; line-height: 1; cursor: pointer; white-space: nowrap; }
.drag-notes-pop { position: absolute; z-index: 6; top: 46px; right: 10px; width: min(390px, calc(100% - 20px)); max-height: calc(100% - 56px); overflow-y: auto; background: var(--surface); color: var(--ink); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-2); padding: 12px; }
.drag-notes-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.drag-notes-pop ul { list-style: none; padding: 0; margin: 8px 0 0; display: grid; gap: 8px; }
.drag-notes-pop button { min-height: 48px; border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; font: inherit; color: var(--ink); background: var(--surface); cursor: pointer; }
.drag-notes-pop li button { width: 100%; text-align: left; background: color-mix(in srgb, #F08C00 10%, var(--surface)); line-height: 1.45; }
.drag-notes-button::before { content: ''; position: absolute; inset: -10px -6px; }
@media (prefers-reduced-motion: reduce) { .drag-seg span { transition: none; } }