/* Lift Studio — 3D Crane Lift Planner
   Refined UI: neutral surfaces, a single teal accent used sparingly, system/SF typography,
   generous whitespace, hairline borders, soft depth. Dark-first; light supported via [data-theme="light"].
   Brand accent stays Cenex teal #2bcbba. */

:root {
  --ls-accent: #2bcbba;
  --ls-accent-press: #25b3a5;
  --ls-accent-soft: rgba(43, 203, 186, 0.14);
  --ls-accent-ring: rgba(43, 203, 186, 0.30);

  /* dark surfaces — near-black with quiet elevation */
  --ls-bg-0: #0b0d0f;       /* page / canvas base */
  --ls-bg-1: rgba(22, 25, 29, 0.72);   /* panel (glass) */
  --ls-bg-1-solid: #16191d;
  --ls-bg-2: #1b1f24;       /* raised (cards) */
  --ls-bg-3: #21262c;       /* inputs */
  --ls-bg-hover: rgba(255, 255, 255, 0.05);
  --ls-line: rgba(255, 255, 255, 0.09);
  --ls-line-strong: rgba(255, 255, 255, 0.14);

  --ls-text: #f2f4f6;
  --ls-text-dim: #aab4bc;
  --ls-text-mute: #717c85;

  --ls-ok: #34d399;
  --ls-warn: #f0b429;
  --ls-bad: #f87171;

  --ls-r-lg: 18px;
  --ls-r-md: 12px;
  --ls-r-sm: 9px;
  --ls-shadow-1: 0 1px 2px rgba(0,0,0,0.3);
  --ls-shadow-2: 0 12px 32px -8px rgba(0,0,0,0.55), 0 2px 8px rgba(0,0,0,0.3);
  --ls-shadow-pop: 0 24px 60px -12px rgba(0,0,0,0.6);
  --ls-font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  --ls-scroll-thumb: rgba(170, 180, 188, 0.34);
  --ls-scroll-thumb-hover: rgba(43, 203, 186, 0.62);
  --ls-scroll-track: rgba(255, 255, 255, 0.045);
}

[data-theme="light"] {
  --ls-accent-soft: rgba(36, 168, 155, 0.12);
  --ls-bg-0: #eef1f4;
  --ls-bg-1: rgba(255, 255, 255, 0.78);
  --ls-bg-1-solid: #ffffff;
  --ls-bg-2: #ffffff;
  --ls-bg-3: #f1f4f6;
  --ls-bg-hover: rgba(15, 30, 40, 0.045);
  --ls-line: rgba(15, 30, 40, 0.10);
  --ls-line-strong: rgba(15, 30, 40, 0.16);
  --ls-text: #10161b;
  --ls-text-dim: #46535c;
  --ls-text-mute: #7b878f;
  --ls-shadow-1: 0 1px 2px rgba(20,40,55,0.08);
  --ls-shadow-2: 0 12px 30px -10px rgba(20,40,55,0.18), 0 2px 6px rgba(20,40,55,0.08);
  --ls-shadow-pop: 0 24px 60px -14px rgba(20,40,55,0.28);
  --ls-scroll-thumb: rgba(70, 83, 92, 0.30);
  --ls-scroll-thumb-hover: rgba(36, 168, 155, 0.62);
  --ls-scroll-track: rgba(15, 30, 40, 0.045);
}

* { box-sizing: border-box; }
html, body {
  margin: 0; height: 100%; font-family: var(--ls-font); color: var(--ls-text);
  background: var(--ls-bg-0); overflow: hidden;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
.ls-app { position: fixed; inset: 0; display: grid; grid-template-rows: auto 1fr; }

/* ---------- top bar ---------- */
.ls-topbar {
  display: flex; align-items: center; gap: 10px; padding: 12px 18px;
  background: var(--ls-bg-1); backdrop-filter: blur(20px) saturate(1.4); -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid var(--ls-line); z-index: 20;
}
.ls-brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.ls-brand__mark {
  width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; color: #06231f;
  background: linear-gradient(150deg, #34d6c6, var(--ls-accent)); box-shadow: var(--ls-shadow-1); flex: 0 0 auto;
}
.ls-brand__mark svg { width: 21px; height: 21px; }
.ls-brand__title { font-weight: 650; font-size: 15px; letter-spacing: -0.015em; white-space: nowrap; }
.ls-brand__title small { display: block; font-weight: 450; font-size: 11px; color: var(--ls-text-mute); letter-spacing: 0; margin-top: 1px; }
.ls-topbar__spacer { flex: 1 1 auto; }

/* segmented control */
.ls-seg { display: inline-flex; background: var(--ls-bg-3); border: 1px solid var(--ls-line); border-radius: 11px; padding: 3px; gap: 2px; }
.ls-seg button {
  appearance: none; border: 0; background: transparent; color: var(--ls-text-dim);
  font: 550 12.5px/1 var(--ls-font); padding: 7px 12px; border-radius: 8px; cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px; transition: background .18s, color .18s; white-space: nowrap;
}
.ls-seg button svg { width: 15px; height: 15px; }
.ls-seg button:hover { color: var(--ls-text); }
.ls-seg button[aria-pressed="true"] { background: var(--ls-bg-1-solid); color: var(--ls-text); box-shadow: var(--ls-shadow-1); }

/* buttons */
.ls-btn {
  appearance: none; cursor: pointer; font: 550 12.5px/1 var(--ls-font); color: var(--ls-text);
  display: inline-flex; align-items: center; gap: 7px; padding: 9px 13px; border-radius: 10px;
  border: 1px solid var(--ls-line); background: var(--ls-bg-3);
  transition: border-color .18s, background .18s, transform .05s, box-shadow .18s; white-space: nowrap;
}
.ls-btn svg { width: 15px; height: 15px; opacity: 0.9; }
.ls-btn:hover { background: var(--ls-bg-2); border-color: var(--ls-line-strong); }
.ls-btn:active { transform: translateY(1px); }
.ls-btn:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--ls-accent-ring); }
.ls-btn--primary { background: var(--ls-accent); border-color: transparent; color: #06231f; font-weight: 650; box-shadow: var(--ls-shadow-1); }
.ls-btn--primary:hover { background: var(--ls-accent-press); }
.ls-btn--ghost { background: transparent; }
.ls-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

.ls-link { color: var(--ls-text-dim); text-decoration: none; display: inline-flex; align-items: center; gap: 6px; padding: 8px; border-radius: 9px; }
.ls-link:hover { color: var(--ls-text); background: var(--ls-bg-hover); }
.ls-link svg { width: 16px; height: 16px; }

.ls-textbtn {
  appearance: none; border: 0; background: transparent; cursor: pointer; color: var(--ls-accent);
  font: 600 11.5px/1 var(--ls-font); padding: 3px 4px; border-radius: 6px;
}
.ls-textbtn:hover { background: var(--ls-accent-soft); }

/* ---------- stage ---------- */
.ls-stage { position: relative; overflow: hidden; }
#ls-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; cursor: grab; }
#ls-canvas:active { cursor: grabbing; }

.ls-webgl-fallback { position: absolute; inset: 0; display: none; place-items: center; text-align: center; padding: 40px; color: var(--ls-text-dim); }
.ls-stage--no-webgl #ls-canvas { display: none; }
.ls-stage--no-webgl .ls-webgl-fallback { display: grid; }

/* floating panels */
.ls-panel {
  position: absolute; background: var(--ls-bg-1);
  backdrop-filter: blur(22px) saturate(1.4); -webkit-backdrop-filter: blur(22px) saturate(1.4);
  border: 1px solid var(--ls-line); border-radius: var(--ls-r-lg); box-shadow: var(--ls-shadow-2);
}
.ls-panel__head { display: flex; align-items: center; gap: 8px; padding: 14px 16px 12px; border-bottom: 1px solid var(--ls-line); }
.ls-panel__head h2 { margin: 0; font-size: 11px; font-weight: 600; letter-spacing: 0.07em; text-transform: uppercase; color: var(--ls-text-mute); }
.ls-panel__head .ls-chip { margin-left: auto; }
.ls-panel__head .ls-textbtn { margin-left: auto; }

.ls-controls__body,
.ls-results__body,
.ls-crane-panel__body,
.ls-topbar {
  scrollbar-width: thin;
  scrollbar-color: var(--ls-scroll-thumb) var(--ls-scroll-track);
  scrollbar-gutter: stable;
  overscroll-behavior: contain;
}
.ls-controls__body::-webkit-scrollbar,
.ls-results__body::-webkit-scrollbar,
.ls-crane-panel__body::-webkit-scrollbar,
.ls-topbar::-webkit-scrollbar { width: 9px; height: 9px; }
.ls-controls__body::-webkit-scrollbar-track,
.ls-results__body::-webkit-scrollbar-track,
.ls-crane-panel__body::-webkit-scrollbar-track,
.ls-topbar::-webkit-scrollbar-track { background: var(--ls-scroll-track); border-radius: 999px; margin: 8px 2px; }
.ls-controls__body::-webkit-scrollbar-thumb,
.ls-results__body::-webkit-scrollbar-thumb,
.ls-crane-panel__body::-webkit-scrollbar-thumb,
.ls-topbar::-webkit-scrollbar-thumb {
  background: var(--ls-scroll-thumb);
  border: 2px solid transparent;
  border-radius: 999px;
  background-clip: padding-box;
}
.ls-controls__body::-webkit-scrollbar-thumb:hover,
.ls-results__body::-webkit-scrollbar-thumb:hover,
.ls-crane-panel__body::-webkit-scrollbar-thumb:hover,
.ls-topbar::-webkit-scrollbar-thumb:hover { background: var(--ls-scroll-thumb-hover); border: 2px solid transparent; background-clip: padding-box; }

/* crane selector — top right */
.ls-crane-panel { top: 16px; right: 16px; width: 300px; }
.ls-crane-panel__body { padding: 12px; max-height: calc(100vh - 150px); overflow-y: auto; }
.ls-cranegroup-label { font-size: 10px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ls-text-mute); margin: 12px 2px 7px; }
.ls-cranegroup-label:first-child { margin-top: 2px; }
.ls-crane-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.ls-crane-card {
  text-align: left; cursor: pointer; border-radius: var(--ls-r-md); border: 1px solid var(--ls-line);
  background: var(--ls-bg-2); color: var(--ls-text); padding: 10px 11px; display: flex; flex-direction: column; gap: 3px;
  transition: border-color .15s, background .15s, transform .05s;
}
.ls-crane-card:hover { border-color: var(--ls-line-strong); background: var(--ls-bg-hover); }
.ls-crane-card:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--ls-accent-ring); }
.ls-crane-card[aria-pressed="true"] { border-color: var(--ls-accent); background: var(--ls-accent-soft); }
.ls-crane-card .nm { font-size: 12px; font-weight: 600; line-height: 1.2; letter-spacing: -0.01em; }
.ls-crane-card .cap { font-size: 10.5px; color: var(--ls-text-mute); }

/* controls — left (top ~58%, scrolls internally so it never overlaps the results panel below) */
.ls-controls { top: 16px; left: 16px; width: 320px; max-height: calc(58% - 22px); display: flex; flex-direction: column; }
.ls-controls__body { padding: 14px 16px 16px; overflow-y: auto; }
.ls-field { margin-bottom: 16px; }
.ls-field:last-child { margin-bottom: 0; }
.ls-field > label { display: block; font-size: 11px; font-weight: 600; letter-spacing: 0.02em; color: var(--ls-text-dim); margin-bottom: 7px; }
.ls-input, .ls-select {
  width: 100%; appearance: none; font: 450 13.5px/1.3 var(--ls-font); color: var(--ls-text);
  background: var(--ls-bg-3); border: 1px solid var(--ls-line); border-radius: var(--ls-r-sm); padding: 10px 12px;
  transition: border-color .15s, box-shadow .15s;
}
.ls-select { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23aab4bc' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 32px; cursor: pointer; }
.ls-input:focus, .ls-select:focus, .ls-textarea:focus { outline: none; border-color: var(--ls-accent); box-shadow: 0 0 0 3px var(--ls-accent-ring); }
.ls-textarea { resize: vertical; min-height: 120px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12.5px; line-height: 1.5; }

.ls-row { display: flex; gap: 8px; align-items: center; }
.ls-row .ls-input { flex: 1; }
.ls-unit { font-size: 12.5px; color: var(--ls-text-mute); font-weight: 550; min-width: 18px; }
.ls-checkrow { flex: 0 0 auto; display: inline-flex; align-items: center; gap: 6px; font-size: 11px; color: var(--ls-text-dim); }
.ls-checkgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 7px 10px; margin: 2px 0 14px; }
.ls-checkgrid label { display: flex; align-items: center; gap: 7px; font-size: 11px; color: var(--ls-text-dim); line-height: 1.3; }
.ls-checkgrid input, .ls-checkrow input { accent-color: var(--ls-accent); }
.ls-row > .ls-field { flex: 1 1 0; min-width: 0; margin-bottom: 12px; }

.ls-slider { width: 100%; appearance: none; height: 4px; border-radius: 4px; background: var(--ls-bg-3); outline: none; margin: 12px 0 5px; }
.ls-slider::-webkit-slider-thumb { appearance: none; width: 18px; height: 18px; border-radius: 50%; background: #fff; cursor: pointer; box-shadow: 0 1px 4px rgba(0,0,0,0.4); border: 0; }
.ls-slider::-moz-range-thumb { width: 16px; height: 16px; border-radius: 50%; background: #fff; cursor: pointer; border: 0; box-shadow: 0 1px 4px rgba(0,0,0,0.4); }
.ls-slider:focus-visible { box-shadow: 0 0 0 3px var(--ls-accent-ring); }
.ls-slider-scale { display: flex; justify-content: space-between; font-size: 10px; color: var(--ls-text-mute); }

.ls-hint { font-size: 11px; color: var(--ls-text-mute); margin-top: 7px; line-height: 1.5; }
.ls-radius-clamped { color: var(--ls-warn) !important; font-weight: 550; }

/* project & sign-off (collapsible) */
.ls-details { border-top: 1px solid var(--ls-line); margin-top: 6px; padding-top: 12px; }
.ls-details > summary { cursor: pointer; font-size: 11px; font-weight: 600; letter-spacing: 0.02em; color: var(--ls-text-dim); list-style: none; display: flex; align-items: center; gap: 7px; }
.ls-details > summary::-webkit-details-marker { display: none; }
.ls-details > summary::before { content: "›"; color: var(--ls-accent); font-size: 15px; transition: transform .18s; display: inline-block; }
.ls-details[open] > summary::before { transform: rotate(90deg); }
.ls-details__hint { font-weight: 450; color: var(--ls-text-mute); }
.ls-details__body { padding-top: 12px; }
.ls-details__body .ls-field { margin-bottom: 11px; }

/* tandem block */
.ls-tandem { border: 1px solid var(--ls-line); border-radius: var(--ls-r-md); padding: 12px; margin-bottom: 16px; background: var(--ls-bg-hover); }
.ls-tandem__title { font-size: 11px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: var(--ls-accent); margin-bottom: 11px; }
.ls-tandem .ls-field:last-child { margin-bottom: 0; }

/* results — bottom left (bottom ~42%, scrolls internally so it never overlaps the controls panel above) */
.ls-results { left: 16px; bottom: 16px; width: 320px; max-height: calc(42% - 22px); display: flex; flex-direction: column; }
.ls-results__body { padding: 14px 16px; overflow-y: auto; }
.ls-gauge { display: flex; align-items: center; gap: 13px; margin-bottom: 12px; }
.ls-gauge__ring { --p: 0; width: 62px; height: 62px; flex: 0 0 auto; border-radius: 50%;
  background: conic-gradient(var(--gc, var(--ls-accent)) calc(var(--p) * 1%), var(--ls-bg-3) 0);
  display: grid; place-items: center; position: relative; transition: background .3s ease; }
.ls-gauge__ring::after { content: ""; position: absolute; inset: 6px; border-radius: 50%; background: var(--ls-bg-1-solid); }
.ls-gauge__num { position: relative; z-index: 1; font-size: 15px; font-weight: 650; letter-spacing: -0.02em; }
.ls-gauge__meta { min-width: 0; }
.ls-gauge__verdict { font-size: 14px; font-weight: 650; letter-spacing: -0.01em; }
.ls-gauge__sub { font-size: 11px; color: var(--ls-text-dim); margin-top: 2px; line-height: 1.35; }
.is-ok { color: var(--ls-ok); } .is-warn { color: var(--ls-warn); } .is-bad { color: var(--ls-bad); }

.ls-readout { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 14px; }
.ls-readout div { min-width: 0; }
.ls-readout dt { font-size: 10px; color: var(--ls-text-mute); text-transform: uppercase; letter-spacing: 0.05em; }
.ls-readout dd { margin: 2px 0 0; font-size: 14px; font-weight: 600; letter-spacing: -0.01em; }
.ls-readout dd span { font-size: 11px; font-weight: 450; color: var(--ls-text-mute); }

.ls-chip { font-size: 10px; font-weight: 650; padding: 3px 9px; border-radius: 100px; letter-spacing: 0.04em; text-transform: uppercase; }
.ls-chip--ok { background: color-mix(in srgb, var(--ls-ok) 18%, transparent); color: var(--ls-ok); }
.ls-chip--warn { background: color-mix(in srgb, var(--ls-warn) 20%, transparent); color: var(--ls-warn); }
.ls-chip--bad { background: color-mix(in srgb, var(--ls-bad) 20%, transparent); color: var(--ls-bad); }

/* CBR preset chips + field value + pad diagram (G2) */
.ls-field__val { float: right; font-weight: 600; color: var(--ls-text); }
.ls-chips { display: flex; flex-wrap: wrap; gap: 5px; margin: 2px 0 5px; }
.ls-chip-btn { font-size: 10px; padding: 3px 8px; border-radius: 100px; border: 1px solid var(--ls-line); background: var(--ls-bg-2); color: var(--ls-text-dim); cursor: pointer; transition: background .12s, color .12s, border-color .12s; }
.ls-chip-btn:hover { background: var(--ls-bg-3); color: var(--ls-text); border-color: var(--ls-accent); }
.ls-chip-btn:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--ls-accent-ring); }
.ls-pad-diagram { width: 100%; height: auto; margin-top: 8px; border-radius: 8px; background: var(--ls-bg-1); border: 1px solid var(--ls-line); }

/* ground & tandem readouts */
.ls-ground { margin-top: 12px; padding-top: 11px; border-top: 1px solid var(--ls-line); }
.ls-ground__title { font-size: 10px; font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase; color: var(--ls-text-mute); display: flex; align-items: center; gap: 7px; }
.ls-ground__tag { font-weight: 600; font-size: 9px; letter-spacing: 0.03em; color: var(--ls-text-dim); background: var(--ls-bg-3); padding: 2px 7px; border-radius: 100px; text-transform: none; }
.ls-ground__line { margin: 6px 0 0; font-size: 11.5px; line-height: 1.5; color: var(--ls-text-dim); }
.ls-ground__line b { color: var(--ls-text); font-weight: 600; }
.ls-ground__line .ok { color: var(--ls-ok); font-weight: 600; }
.ls-ground__line .warn { color: var(--ls-warn); font-weight: 600; }
.ls-ground__line .bad { color: var(--ls-bad); font-weight: 600; }
.ls-ground__cond { display: block; margin-bottom: 4px; color: var(--ls-text-mute); font-size: 10.5px; }

.ls-results__disclaimer { margin: 12px 0 0; padding-top: 11px; border-top: 1px solid var(--ls-line); font-size: 10.5px; line-height: 1.5; color: var(--ls-warn); opacity: 0.92; }

/* drag hint + disclaimer */
.ls-draghint {
  position: absolute; left: 50%; bottom: 18px; transform: translateX(-50%);
  background: var(--ls-bg-1); border: 1px solid var(--ls-line); border-radius: 100px; padding: 8px 15px;
  font-size: 11.5px; color: var(--ls-text-dim); box-shadow: var(--ls-shadow-1); display: flex; align-items: center; gap: 8px;
  pointer-events: none; backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
}
.ls-draghint svg { width: 14px; height: 14px; color: var(--ls-accent); }
.ls-disclaimer { position: absolute; right: 16px; bottom: 16px; max-width: 280px; font-size: 10px; color: var(--ls-text-mute); text-align: right; line-height: 1.5; pointer-events: none; }

/* modals */
.ls-modal { position: fixed; inset: 0; z-index: 1000; display: grid; place-items: center; background: rgba(6,10,12,0.55); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
.ls-modal[hidden] { display: none; }
.ls-modal__card { width: min(440px, 92vw); background: var(--ls-bg-1-solid); border: 1px solid var(--ls-line); border-radius: var(--ls-r-lg); box-shadow: var(--ls-shadow-pop); padding: 22px; }
.ls-modal__card--wide { width: min(560px, 94vw); }
.ls-modal__card h2 { margin: 0 0 8px; font-size: 17px; font-weight: 650; letter-spacing: -0.02em; }
.ls-modal__card p { margin: 0 0 16px; font-size: 13px; color: var(--ls-text-dim); line-height: 1.5; }
.ls-modal__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.ls-modal__actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 4px; }
.ls-gate-check { display: flex; gap: 10px; align-items: flex-start; font-size: 12.5px; color: var(--ls-text); margin-bottom: 18px; cursor: pointer; line-height: 1.45; }
.ls-gate-check input { margin-top: 2px; flex: 0 0 auto; accent-color: var(--ls-accent); }

/* toast */
.ls-toast { position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%); z-index: 1100;
  background: var(--ls-text); color: var(--ls-bg-0); font: 550 13px/1 var(--ls-font); padding: 12px 18px;
  border-radius: 100px; box-shadow: var(--ls-shadow-pop); }
.ls-toast[hidden] { display: none; }

/* spinner */
.ls-loading { position: absolute; inset: 0; display: grid; place-items: center; z-index: 5; }
.ls-spinner { width: 30px; height: 30px; border-radius: 50%; border: 2.5px solid var(--ls-line); border-top-color: var(--ls-accent); animation: ls-spin 0.7s linear infinite; }
@keyframes ls-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .ls-spinner { animation-duration: 2s; } * { scroll-behavior: auto; } }

/* responsive */
@media (max-width: 960px) {
  .ls-controls, .ls-crane-panel { width: calc(50% - 24px); }
  .ls-results { width: calc(100% - 32px); }
}
@media (max-width: 680px) {
  /* phones: drop the floating overlay layout and stack everything in normal flow */
  html, body { overflow: auto; }
  .ls-app { position: static; display: block; }
  .ls-topbar { gap: 6px; padding: 10px 12px; overflow-x: auto; position: sticky; top: 0; }
  .ls-brand__title small { display: none; }
  .ls-stage { height: 56vh; }
  .ls-panel { position: static; width: auto; margin: 12px; max-height: none;
    backdrop-filter: none; -webkit-backdrop-filter: none; background: var(--ls-bg-1-solid); }
  .ls-crane-panel__body { max-height: none; }
  .ls-draghint { display: none; }
}

/* ───────────── Line Studio — segment manager + rollup additions ───────────── */
/* segment list panel (top-right, mirrors the crane selector) */
.ls-seg-panel { top: 16px; right: 16px; width: 320px; max-height: calc(100vh - 150px); display: flex; flex-direction: column; }
.ls-seg-panel__body { padding: 12px; overflow-y: auto; }
.ls-seglist { display: flex; flex-direction: column; gap: 8px; }
.ls-segcard {
  text-align: left; cursor: pointer; border-radius: var(--ls-r-md); border: 1px solid var(--ls-line);
  background: var(--ls-bg-2); color: var(--ls-text); padding: 10px 11px; display: flex; flex-direction: column; gap: 4px;
  transition: border-color .15s, background .15s; position: relative;
}
.ls-segcard:hover { border-color: var(--ls-line-strong); background: var(--ls-bg-hover); }
.ls-segcard[aria-pressed="true"] { border-color: var(--ls-accent); background: var(--ls-accent-soft); }
.ls-segcard__top { display: flex; align-items: baseline; gap: 8px; }
.ls-segcard__kv { font-size: 12.5px; font-weight: 700; color: var(--ls-accent); letter-spacing: -0.01em; }
.ls-segcard__nm { font-size: 12px; font-weight: 600; line-height: 1.2; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ls-segcard__meta { font-size: 10.5px; color: var(--ls-text-mute); line-height: 1.4; }
.ls-segcard__actions { position: absolute; top: 7px; right: 8px; display: none; gap: 3px; }
.ls-segcard:hover .ls-segcard__actions, .ls-segcard[aria-pressed="true"] .ls-segcard__actions { display: flex; }
.ls-segcard__actions button { appearance: none; border: 0; background: var(--ls-bg-3); color: var(--ls-text-dim); width: 22px; height: 22px; border-radius: 6px; cursor: pointer; display: grid; place-items: center; font-size: 12px; line-height: 1; }
.ls-segcard__actions button:hover { background: var(--ls-bg-1-solid); color: var(--ls-text); }
.ls-segcard__actions button.del:hover { color: var(--ls-bad); }
.ls-seg-addbtn { width: 100%; margin-top: 4px; justify-content: center; }

/* rollup readout — a tidy line-item table */
.ls-roll { display: grid; grid-template-columns: 1fr auto; gap: 7px 10px; margin: 4px 0 0; }
.ls-roll dt { font-size: 11px; color: var(--ls-text-dim); }
.ls-roll dd { margin: 0; font-size: 12.5px; font-weight: 600; text-align: right; letter-spacing: -0.01em; }
.ls-roll dd span { font-size: 10px; font-weight: 450; color: var(--ls-text-mute); }
.ls-roll .hl dd { color: var(--ls-accent); }
.ls-rollhead { font-size: 10px; font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase; color: var(--ls-text-mute); margin: 14px 0 4px; padding-top: 10px; border-top: 1px solid var(--ls-line); }
.ls-rollhead:first-child { margin-top: 2px; padding-top: 0; border-top: 0; }
.ls-freeissue { font-size: 10px; color: var(--ls-text-mute); font-style: italic; }
.ls-segbreak { margin-top: 6px; }
.ls-segbreak__row { font-size: 10.5px; color: var(--ls-text-dim); padding: 4px 0; border-bottom: 1px dashed var(--ls-line); line-height: 1.4; }
.ls-segbreak__row b { color: var(--ls-text); }

/* free-issue toggle grid */
.ls-fi-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 7px 10px; margin: 2px 0 4px; }
.ls-fi-grid label { display: flex; align-items: center; gap: 7px; font-size: 11px; color: var(--ls-text-dim); }
.ls-fi-grid input { accent-color: var(--ls-accent); }

/* per-segment cost line on the cards (cost layer) */
.ls-segcard__cost { font-size: 10.5px; font-weight: 600; color: var(--ls-accent); margin-top: 2px; }

/* ── Live route-profile panel (bottom-right) + pop-out (parity with substation SLD) ── */
.ls-sld-panel { right: 16px; bottom: 16px; width: 380px; display: flex; flex-direction: column; max-height: min(300px, 42vh); }
.ls-sld-panel .ls-panel__head { gap: 6px; }
.ls-sld-panel .ls-panel__head .ls-iconbtn:first-of-type { margin-left: auto; }
.ls-iconbtn { appearance: none; border: 0; background: transparent; cursor: pointer; color: var(--ls-text-dim); width: 26px; height: 26px; border-radius: 7px; display: grid; place-items: center; transition: background .15s, color .15s; }
.ls-iconbtn svg { width: 15px; height: 15px; }
.ls-iconbtn:hover { background: var(--ls-bg-hover); color: var(--ls-text); }
.ls-iconbtn:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--ls-accent-ring); }
.ls-sld-panel__body { padding: 10px 12px 12px; overflow: auto; min-height: 0; display: grid; place-items: center; }
.ls-sld-panel__body svg { width: 100%; height: auto; display: block; shape-rendering: geometricPrecision; }
.ls-sld-panel.is-collapsed .ls-sld-panel__body { display: none; }
.ls-sld-panel.is-collapsed { max-height: none; }
.ls-sld-panel.is-collapsed #ls-prof-collapse svg { transform: rotate(-90deg); }
#ls-prof-collapse svg { transition: transform .18s; }

.ls-modal__card--sld { width: min(1100px, 95vw); max-height: 92vh; padding: 18px 20px; display: flex; flex-direction: column; }
.ls-sld-modal__head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.ls-sld-modal__head h2 { margin: 0; font-size: 16px; font-weight: 650; }
.ls-sld-modal__tools { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.ls-sld-modal__scroll { flex: 1 1 auto; overflow: auto; min-height: 0; border: 1px solid var(--ls-line); border-radius: var(--ls-r-md); background: var(--ls-bg-2); padding: 16px; }
.ls-sld-modal__scroll svg { width: 100%; height: auto; min-width: 640px; display: block; shape-rendering: geometricPrecision; }
.ls-sld-modal__note { margin: 10px 0 0; font-size: 10.5px; color: var(--ls-text-mute); line-height: 1.5; }
@media (max-width: 680px) { .ls-sld-panel { width: auto; } }

/* ───────────── UI parity with Substation Studio (legend, active HUD, cost bar, empty state, a11y) ───────────── */
.ls-sld-empty { margin: 0; padding: 22px 10px; text-align: center; font-size: 11.5px; color: var(--ls-text-mute); line-height: 1.5; }
/* on-canvas legend — collapsible, bottom-centre (pure-CSS <details>) */
.ls-legend { position: absolute; left: 50%; bottom: 56px; transform: translateX(-50%); z-index: 6; max-width: min(720px, 66vw);
  background: var(--ls-bg-1); backdrop-filter: blur(16px) saturate(1.3); -webkit-backdrop-filter: blur(16px) saturate(1.3);
  border: 1px solid var(--ls-line); border-radius: var(--ls-r-md); box-shadow: var(--ls-shadow-1); }
.ls-legend > summary { cursor: pointer; list-style: none; display: flex; align-items: center; gap: 7px; padding: 7px 13px; font-size: 10px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ls-text-mute); }
.ls-legend > summary::-webkit-details-marker { display: none; }
.ls-legend > summary::before { content: "›"; color: var(--ls-accent); font-size: 14px; transition: transform .18s; display: inline-block; }
.ls-legend[open] > summary::before { transform: rotate(90deg); }
.ls-legend__grid { display: flex; flex-wrap: wrap; gap: 6px 14px; padding: 0 13px 11px; }
.ls-legend__item { display: inline-flex; align-items: center; gap: 6px; font-size: 10.5px; color: var(--ls-text-dim); white-space: nowrap; }
.ls-legend__sw { width: 11px; height: 11px; border-radius: 3px; flex: 0 0 auto; border: 1px solid rgba(127,127,127,0.35); }
.ls-legend__sw--wire { height: 3px; width: 14px; border-radius: 2px; }
/* selected-segment HUD label */
.ls-active-tag { position: absolute; left: 50%; top: 14px; transform: translateX(-50%); z-index: 6; display: inline-flex; align-items: center; gap: 7px; padding: 6px 14px; border-radius: 100px; background: var(--ls-bg-1); border: 1px solid var(--ls-line); box-shadow: var(--ls-shadow-1); font-size: 11.5px; color: var(--ls-text-dim); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); pointer-events: none; }
.ls-active-tag b { color: var(--ls-accent); font-weight: 700; }
.ls-active-tag[hidden] { display: none; }
/* cost proportion bar */
.ls-costbar { display: flex; height: 10px; border-radius: 100px; overflow: hidden; margin: 10px 0 7px; background: var(--ls-bg-3); }
.ls-costbar span { display: block; height: 100%; transition: width .25s ease; }
.ls-costbar-key { display: flex; flex-wrap: wrap; gap: 3px 13px; font-size: 10px; color: var(--ls-text-mute); margin-bottom: 2px; }
.ls-costbar-key i { width: 9px; height: 9px; border-radius: 2px; display: inline-block; margin-right: 5px; vertical-align: -1px; }
/* indented cost sub-rows + free-issue emphasis */
.ls-roll dt.sub { padding-left: 12px; color: var(--ls-text-mute); }
.ls-roll .fi dd { color: var(--ls-warn); }
/* "Active segment" divider */
.ls-section-label { font-size: 11px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: var(--ls-accent); margin: 4px 0 12px; padding-top: 14px; border-top: 1px solid var(--ls-line); }
@media (pointer: coarse) { .ls-segcard__actions { display: flex; } .ls-segcard__actions button { width: 30px; height: 30px; } }
@media (max-width: 680px) { .ls-legend, .ls-active-tag { display: none; } }