:root {
  --bg: rgba(14, 16, 26, 0.86);
  --fg: #e6e8ef;
  --muted: #8a90a2;
  --accent: #f0a63a;
  --line: rgba(255, 255, 255, 0.08);
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; background: #07080e; color: var(--fg);
  font: 13px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }

#c { position: fixed; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }

#panel { position: fixed; top: 10px; left: 10px; bottom: 10px; width: 330px; display: flex; flex-direction: column;
  background: var(--bg); backdrop-filter: blur(8px); border: 1px solid var(--line); border-radius: 10px;
  overflow: hidden; transition: transform 0.25s ease; z-index: 2; }
body.hide-panel #panel { transform: translateX(-350px); }
body.init #panel { transition: none; }

#panel header { display: flex; align-items: center; justify-content: space-between; padding: 10px 14px;
  border-bottom: 1px solid var(--line); }
#panel h1 { flex: 1; margin: 0; font-size: 16px; font-weight: 600; letter-spacing: 0.3px; cursor: pointer; user-select: none; }
#panel h1::after { content: " ▾"; color: var(--muted); font-size: 12px; }
#panel h1 b { color: var(--accent); font-weight: 600; }
body.panel-min #panel h1::after { content: " ▸"; }
body.panel-min #panel { bottom: auto; }
body.panel-min #controls, body.panel-min .foot, body.panel-min .help, body.panel-min .links { display: none; }
body.panel-min #panel header { border-bottom: 0; }
#lang { width: auto; margin-right: 6px; padding: 2px 4px; font-size: 12px; }
#panel-toggle { background: none; border: 0; color: var(--muted); font-size: 20px; cursor: pointer; padding: 0 4px; }
#panel-show { position: fixed; top: 12px; left: 12px; display: none; background: var(--bg); color: var(--fg);
  border: 1px solid var(--line); border-radius: 8px; font-size: 18px; padding: 4px 10px; cursor: pointer; z-index: 2; }
body.hide-panel #panel-show { display: block; }

#controls { flex: 1; overflow-y: auto; padding: 4px 0; }
.block { padding: 8px 14px; border-bottom: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); padding: 4px 14px 8px; }
summary { cursor: pointer; padding: 6px 0; font-weight: 600; color: var(--accent); list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::before { content: "▸ "; color: var(--muted); }
details[open] summary::before { content: "▾ "; }

.row { display: grid; grid-template-columns: 80px 1fr 102px; align-items: center; gap: 8px; margin: 4px 0; }
.row.wide { grid-template-columns: 80px 1fr; }
.row.wide:has(> :only-child) { grid-template-columns: 1fr; }
.row .lbl { color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.row.check { grid-template-columns: auto 1fr; cursor: pointer; }

input[type=range] { width: 100%; accent-color: var(--accent); }
select, input[type=text], textarea { width: 100%; background: #1b1e2a; color: var(--fg); border: 1px solid var(--line);
  border-radius: 6px; padding: 4px 6px; font: inherit; }
input[type=text] { font-family: ui-monospace, Consolas, monospace; }
input[type=text].bad { border-color: #d0505a; }
input[type=text]:focus, textarea:focus { outline: none; border-color: var(--accent); }
textarea { resize: vertical; font: 11px/1.35 ui-monospace, Consolas, monospace; margin: 4px 0 0; }

.btn-row { display: flex; gap: 6px; margin: 6px 0 2px; }
.btn-row button, .foot button, .seg button { flex: 1; padding: 7px 6px; border-radius: 6px; border: 0; font: inherit; cursor: pointer;
  background: #262a38; color: var(--fg); white-space: nowrap; }
.btn-row button:hover, .foot button:hover, .seg button:hover { background: #31364a; }
.btn-row button.primary { background: var(--accent); color: #1a1205; font-weight: 600; }
.btn-row button.primary:hover { background: #f5b65a; }
.btn-row button.narrow { flex: 0 0 48px; }
.seg { display: flex; gap: 0; margin: 8px 0 2px; border-radius: 6px; overflow: hidden; }
.seg button { border-radius: 0; }
.seg button + button { border-left: 1px solid var(--line); }
.seg button.on { background: #3a3324; color: var(--accent); box-shadow: inset 0 -2px 0 var(--accent); }
.foot { padding: 8px 14px; border-top: 1px solid var(--line); display: flex; }

.info { margin: 4px 0 6px; color: var(--muted); font-size: 12px; line-height: 1.45; }
.info b { color: var(--fg); font-weight: 600; }

.chips { display: flex; flex-wrap: wrap; gap: 4px; margin: 2px 0 6px; }
.chips button { padding: 3px 9px; border: 1px solid var(--line); border-radius: 999px; background: #1b1e2a; color: var(--muted);
  font: inherit; font-size: 12px; cursor: pointer; }
.chips button:hover { color: var(--fg); }
.chips button.on { background: var(--accent); border-color: var(--accent); color: #1a1205; font-weight: 600; }

.seg.tools { flex-wrap: wrap; gap: 1px; background: var(--line); }
.seg.tools button { flex: 1 1 calc(33% - 1px); border-left: 0 !important; padding: 6px 4px; font-size: 12px; }
.seg.tools button.term { flex: 1 1 calc(50% - 1px); font-weight: 600; }

.res-main { margin: 2px 0 4px; }
.res-main .lbl { color: var(--muted); font-size: 12px; }
.res-main .big { font: 600 22px ui-monospace, Consolas, monospace; color: var(--accent); letter-spacing: 0.3px; }
.formula { margin: 4px 0; padding: 5px 7px; border-radius: 6px; background: #11141e; border: 1px solid var(--line);
  font: 12px/1.45 ui-monospace, Consolas, monospace; color: var(--fg); word-break: break-word; }
.kv { display: grid; grid-template-columns: 1fr auto; gap: 2px 10px; margin: 6px 0 2px; font-size: 12px; }
.kv span:nth-child(odd) { color: var(--muted); }
.kv span:nth-child(even) { font-family: ui-monospace, Consolas, monospace; text-align: right; }
.err { margin: 4px 0; padding: 5px 7px; border-radius: 6px; background: #3a1414; border: 1px solid #a33; color: #ffd0d0; font-size: 12px; }
.warn { color: #ffb36b; }
.elem-head { display: flex; justify-content: space-between; align-items: baseline; margin: 2px 0 4px; }
.elem-head b { font-size: 14px; }
.elem-head span { color: var(--muted); font-size: 12px; }
.val-row { display: flex; gap: 6px; align-items: center; margin: 4px 0; }
.val-row .num { flex: 1; height: 30px; }
.val-row .num input { font-size: 14px; text-align: left; padding: 0 8px; font-family: ui-monospace, Consolas, monospace; }
.val-row .num i { font-size: 13px; padding-right: 6px; }
.val-row .num .spin { width: 20px; }
.val-row .num .spin button { font-size: 9px; }
.val-row .num.bad { border-color: #d0505a; }
.val-row button { padding: 5px 8px; border-radius: 6px; border: 0; background: #262a38; color: var(--fg); font: inherit; font-size: 12px; cursor: pointer; white-space: nowrap; }
.val-row button:hover { background: #31364a; }
#ex-desc { min-height: 34px; }
#src-mode { margin: 8px 0 2px; padding-top: 8px; border-top: 1px solid var(--line); }
#src-mode .lbl-line { color: var(--muted); font-size: 12px; margin-bottom: 4px; }
#src-seg { margin: 0 0 6px; }
#src-seg button { font-size: 12px; padding: 6px 4px; }
details.sub { border: 0; padding: 0; margin: 2px 0 0; }
details.sub summary { color: var(--fg); font-weight: 500; font-size: 12px; padding: 4px 0; }
details.sub .info p { margin: 0 0 6px; }
#stats .t sup { font-size: 9px; color: var(--muted); margin-left: 2px; }

#tip { position: fixed; z-index: 3; pointer-events: none; padding: 5px 9px; border-radius: 7px; background: rgba(14, 16, 26, 0.94);
  border: 1px solid var(--line); font-size: 12px; line-height: 1.5; font-variant-numeric: tabular-nums; white-space: nowrap; }
#tip b { color: var(--accent); }

.help { margin: 0; padding: 8px 14px 10px; color: var(--muted); font-size: 11px; border-top: 1px solid var(--line); }
.help b { color: var(--fg); font-weight: 600; }
.links { display: flex; justify-content: space-between; padding: 6px 14px 10px; font-size: 12px; }
.links a { color: var(--accent); text-decoration: none; }

#stats { position: fixed; top: 10px; right: 10px; padding: 6px 10px 8px; background: rgba(14, 16, 26, 0.72); border: 1px solid var(--line);
  border-radius: 8px; backdrop-filter: blur(6px); color: rgba(230, 232, 239, 0.85); font-size: 12px; text-align: right;
  font-variant-numeric: tabular-nums; text-shadow: 0 1px 2px #000; pointer-events: none; z-index: 1; line-height: 1.6; }
#stats:empty { display: none; }
#stats .t { font: 600 16px ui-monospace, Consolas, monospace; color: var(--accent); letter-spacing: 0.3px; }
#stats .t i { font: 12px system-ui, sans-serif; color: var(--muted); font-style: normal; letter-spacing: 0; }
#hint { position: fixed; left: 50%; bottom: 18px; transform: translateX(-50%); padding: 6px 12px; border-radius: 8px;
  background: var(--bg); border: 1px solid var(--line); color: var(--fg); font-size: 12px; z-index: 1; pointer-events: none;
  white-space: nowrap; }

@media (min-width: 701px) {
  body:not(.hide-panel) #hint { left: calc(50% + 170px); }
}

@media (max-width: 700px) {
  #panel { top: auto; left: 0; right: 0; bottom: 0; width: auto; height: 42vh; border-radius: 12px 12px 0 0; }
  html, body { font-size: 12px; }
  #panel header { padding: 6px 10px; }
  #panel h1 { font-size: 14px; }
  #panel h1::after { content: " ▾"; }
  body.panel-min #panel { height: auto; bottom: 0; }
  body.panel-min #panel h1::after { content: " ▴"; }
  body.hide-panel #panel { transform: translateY(calc(42vh + 20px)); }
  .block { padding: 4px 10px; }
  details { padding: 2px 10px 4px; }
  .row { grid-template-columns: 72px 1fr 100px; gap: 6px; margin: 2px 0; }
  .row.wide { grid-template-columns: 72px 1fr; }
  .btn-row button, .foot button, .seg button { padding: 6px 4px; }
  .foot { padding: 4px 10px; }
  .help { display: none; }
  .links { padding: 4px 10px 6px; }
  #stats { top: 8px; right: 10px; font-size: 11px; }
  #stats .t { font-size: 14px; }
  #hint { bottom: calc(42vh + 10px); white-space: normal; width: max-content; max-width: 92vw; text-align: center; }
  body.hide-panel #hint { bottom: 14px; }
}
[hidden] { display: none !important; }
.pal-cat { color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; margin: 8px 0 3px; }
.pal-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; }
.pal-grid button { padding: 5px 4px; border-radius: 6px; border: 1px solid var(--line); background: #1b1e2a; color: var(--fg); font: inherit; font-size: 11.5px; cursor: pointer; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pal-grid button:hover { background: #262a38; }
.pal-grid button.on { background: var(--accent); color: #1a1205; border-color: var(--accent); font-weight: 600; }
#props input[type=number], #props input[type=text], #props select { width: 100%; }
#props textarea { font: 12px/1.4 ui-monospace, Consolas, monospace; }
.block-lbl { display: block; color: var(--muted); margin: 6px 0 2px; }
#stats .warn { color: #ffb36b; }
#c { cursor: default; }