:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --border: #d5d8de;
  --text: #1d2330;
  --muted: #667085;
  --accent: #2f6fdb;
  --accent-text: #ffffff;
  --select: #e8491d;
  --row-select: #fde2d7;
  --hover: #eef3fc;
  --danger: #c0352b;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "Cascadia Mono", Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { font: 13px/1.4 var(--font); color: var(--text); background: var(--bg); display: flex; flex-direction: column; overflow: hidden; }
[hidden] { display: none !important; }

button, .button, select, input[type=text], input[type=number], textarea {
  font: inherit; color: inherit; border: 1px solid var(--border); border-radius: 4px; background: var(--panel);
}
button, .button { padding: 4px 10px; cursor: pointer; text-decoration: none; display: inline-block; white-space: nowrap; }
button:hover:not(:disabled), .button:hover { background: var(--hover); }
button:disabled { opacity: .45; cursor: default; }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
button.primary:hover:not(:disabled) { background: #245bb8; }
select, input[type=text], input[type=number] { padding: 3px 6px; }
input.narrow { width: 64px; }
select.wide { min-width: 360px; max-width: 50vw; }
textarea { padding: 6px; width: 100%; resize: vertical; }
label { display: block; margin: 6px 0; }
label.inline { display: inline-flex; align-items: center; gap: 6px; margin: 0; }
h3 { font-size: 13px; margin: 0 0 6px; }
.hint { color: var(--muted); font-size: 12px; }

/* Top bar */
.topbar { display: flex; align-items: center; gap: 16px; padding: 6px 12px; background: #1f2a3c; color: #fff; flex: 0 0 auto; }
.brand { font-weight: 700; font-size: 15px; letter-spacing: .5px; }
.brand span { font-weight: 400; opacity: .7; margin-left: 6px; font-size: 13px; }
.dataset-controls { display: flex; align-items: center; gap: 6px; }
.dataset-controls label { margin: 0; opacity: .85; }
.dataset-controls select { min-width: 220px; }
.topbar button:not(.primary), .topbar select { background: #2c3a52; border-color: #43536f; color: #fff; }
.topbar button:not(.primary):hover:not(:disabled) { background: #3a4b69; }
.status { margin-left: auto; opacity: .85; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* Layout */
.layout { flex: 1 1 auto; display: flex; flex-direction: column; min-height: 0; }
.top-pane { flex: 1 1 auto; display: flex; flex-direction: column; min-height: 120px; background: var(--panel); }
.bottom-pane { flex: 0 0 var(--grid-height, 240px); display: flex; flex-direction: column; min-height: 60px; background: var(--panel); }
.splitter { flex: 0 0 6px; cursor: row-resize; background: var(--bg); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.splitter:hover { background: #dfe4ec; }

.tabs { display: flex; gap: 2px; padding: 6px 8px 0; border-bottom: 1px solid var(--border); background: var(--bg); flex: 0 0 auto; }
.tabs button { border: 1px solid transparent; border-bottom: none; border-radius: 4px 4px 0 0; background: transparent; padding: 6px 16px; margin-bottom: -1px; }
.tabs button[aria-selected=true] { background: var(--panel); border-color: var(--border); font-weight: 600; }
.tab-pane { flex: 1 1 auto; display: flex; flex-direction: column; min-height: 0; }
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 6px 8px; border-bottom: 1px solid var(--border); flex: 0 0 auto; }
.toolbar.compact { border: none; padding: 0 0 6px; }
.toolbar .sep { width: 1px; align-self: stretch; background: var(--border); margin: 0 4px; }
.counter { min-width: 70px; text-align: center; }
.scroll-area { flex: 1 1 auto; overflow: auto; min-height: 0; }

/* Images */
.images { padding: 8px; display: flex; flex-wrap: wrap; gap: 8px; align-content: flex-start; background: #e9ebef; }
.frame { position: relative; flex: 0 0 auto; background: #000; box-shadow: 0 1px 3px rgba(0,0,0,.3); }
.frame img { display: block; width: 100%; height: 100%; user-select: none; -webkit-user-drag: none; }
.frame svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.frame .label { position: absolute; left: 4px; top: 4px; background: rgba(0,0,0,.6); color: #fff; padding: 1px 6px; border-radius: 3px; font-size: 11px; pointer-events: none; }
.frame circle { fill: transparent; vector-effect: non-scaling-stroke; stroke-width: 2px; cursor: pointer; }
.frame circle.selected { stroke: var(--select) !important; stroke-width: 4px; }

/* Classes */
.groups { background: #fafbfc; }
.group { display: flex; border-bottom: 1px solid var(--border); min-height: 52px; }
.group.drop-target { background: #fff8d6; }
.group-head { flex: 0 0 170px; display: flex; flex-direction: column; gap: 4px; padding: 6px 8px; border-right: 1px solid var(--border); background: var(--panel); position: sticky; left: 0; z-index: 1; }
.group-head .num { font-weight: 700; font-size: 14px; }
.group-head input { width: 100%; font-weight: 600; }
.group-head .count { color: var(--muted); font-size: 11px; }
.group-body { flex: 1 1 auto; display: flex; flex-wrap: wrap; gap: 2px; padding: 4px; align-content: flex-start; min-width: 0; }
.groups.unwrapped .group-body { flex-wrap: nowrap; }
.groups.unwrapped { overflow-x: auto; }
.groups.unwrapped .group { width: max-content; min-width: 100%; }

.thumb { flex: 0 0 auto; background-repeat: no-repeat; background-color: #222; outline: 1px solid rgba(0,0,0,.25); border: 2px solid transparent; cursor: grab; box-sizing: content-box; }
.thumb.selected { border-color: var(--select); }
.thumb.dragging { opacity: .4; }
.thumbs { display: flex; flex-wrap: wrap; gap: 2px; padding: 4px; align-content: flex-start; }

/* Model */
.model-body { flex: 1 1 auto; display: flex; min-height: 0; }
.canvas-wrap { flex: 1 1 auto; position: relative; min-width: 0; background: #fff; overflow: hidden; }
.canvas-wrap canvas { position: absolute; inset: 0; width: 100%; height: 100%; cursor: crosshair; }
.canvas-wrap .empty { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; color: var(--muted); padding: 20px; text-align: center; }
.canvas-help { position: absolute; right: 8px; bottom: 6px; font-size: 11px; color: var(--muted); background: rgba(255,255,255,.8); padding: 1px 6px; border-radius: 3px; pointer-events: none; }
.side-panel { flex: 0 0 260px; border-left: 1px solid var(--border); padding: 8px 10px; overflow: auto; background: var(--panel); }
.side-panel select, .side-panel input[type=text] { width: 100%; }
.side-panel button.primary { width: 100%; margin-top: 8px; }
.tri-list { list-style: none; margin: 0 0 8px; padding: 0; border: 1px solid var(--border); border-radius: 4px; max-height: 260px; overflow: auto; }
.tri-list li { display: flex; align-items: center; gap: 8px; padding: 3px 8px; cursor: pointer; user-select: none; }
.tri-list li:hover { background: var(--hover); }
.tri-list .swatch { width: 12px; height: 12px; border-radius: 2px; flex: 0 0 auto; }
.tri { display: inline-flex; width: 16px; height: 16px; align-items: center; justify-content: center; border-radius: 3px; font-size: 11px; font-weight: 700; border: 1px solid var(--border); flex: 0 0 auto; }
.tri.pos { background: #1e8e3e; border-color: #1e8e3e; color: #fff; }
.tri.neg { background: #fff; color: var(--danger); }
.tri.exc { background: #eceef2; color: var(--muted); }
.result-box { margin-top: 10px; padding: 8px; border: 1px solid var(--border); border-radius: 4px; background: #f7f9fc; font-size: 12px; word-break: break-all; }
.result-box a { display: inline-block; margin: 4px 6px 0 0; }
.warning { color: #9a5b00; }

/* Test */
.description { padding: 6px 10px; color: var(--muted); border-bottom: 1px solid var(--border); font-size: 12px; }
.messages { padding: 6px 10px; background: #fff4e5; color: #7a4500; border-bottom: 1px solid var(--border); white-space: pre-wrap; font-size: 12px; max-height: 90px; overflow: auto; }
.test-body { flex: 1 1 auto; display: flex; min-height: 0; }
.test-pane { flex: 1 1 0; display: flex; flex-direction: column; min-width: 0; border-right: 1px solid var(--border); }
.test-pane h3 { padding: 6px 8px; margin: 0; border-bottom: 1px solid var(--border); background: var(--bg); }
.test-pane .thumbs { flex: 1 1 auto; overflow: auto; }
.count { color: var(--muted); font-weight: 400; }
table.breakdown { border-collapse: collapse; width: 100%; font-size: 12px; }
table.breakdown th, table.breakdown td { border-bottom: 1px solid var(--border); padding: 3px 6px; text-align: right; }
table.breakdown th:first-child, table.breakdown td:first-child { text-align: left; }

/* Settings */
.settings { padding: 12px 16px; display: grid; grid-template-columns: minmax(320px, 2fr) minmax(200px, 1fr) minmax(240px, 1fr); gap: 24px; align-items: start; }
.param-list { columns: 3 170px; border: 1px solid var(--border); border-radius: 4px; padding: 6px 8px; margin-bottom: 8px; }
.param-list label { margin: 1px 0; break-inside: avoid; display: flex; gap: 6px; align-items: center; font-family: var(--mono); font-size: 12px; }
.color-list { display: flex; flex-direction: column; gap: 3px; }
.color-list label { display: flex; align-items: center; gap: 8px; margin: 0; }
.color-list input[type=color] { width: 40px; height: 22px; padding: 0; border: 1px solid var(--border); border-radius: 3px; background: none; }

/* Data grid */
.grid-header { padding: 3px 8px; font-size: 12px; color: var(--muted); border-bottom: 1px solid var(--border); flex: 0 0 auto; }
.grid { flex: 1 1 auto; overflow: auto; position: relative; font-family: var(--mono); font-size: 12px; }
.grid-inner { position: relative; }
.grid-row { position: absolute; left: 0; display: flex; height: 22px; line-height: 21px; border-bottom: 1px solid #eef0f3; cursor: default; }
.grid-row:hover { background: var(--hover); }
.grid-row.selected { background: var(--row-select); }
.grid-row.head { position: sticky; top: 0; z-index: 2; background: var(--bg); font-weight: 600; border-bottom: 1px solid var(--border); font-family: var(--font); }
.grid-cell { flex: 0 0 var(--w, 96px); padding: 0 6px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; border-right: 1px solid #eef0f3; }
.grid-cell.rownum { flex-basis: 52px; color: var(--muted); text-align: right; background: var(--bg); position: sticky; left: 0; }
.grid-row.head .grid-cell.rownum { z-index: 3; }
.grid-cell.cls { font-weight: 600; }

/* Popups */
.context-menu { position: fixed; z-index: 100; background: var(--panel); border: 1px solid var(--border); border-radius: 4px; box-shadow: 0 4px 16px rgba(0,0,0,.18); padding: 4px 0; min-width: 160px; max-height: 70vh; overflow: auto; }
.context-menu .item { padding: 4px 14px 4px 10px; cursor: pointer; display: flex; gap: 8px; align-items: center; }
.context-menu .item:hover { background: var(--hover); }
.context-menu .item.checked { font-weight: 600; }
.context-menu .title { padding: 2px 10px 4px; color: var(--muted); font-size: 11px; border-bottom: 1px solid var(--border); margin-bottom: 2px; }
.context-menu .swatch { width: 10px; height: 10px; border-radius: 2px; }
.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: #1f2a3c; color: #fff; padding: 8px 16px; border-radius: 6px; box-shadow: 0 4px 16px rgba(0,0,0,.25); z-index: 200; max-width: 80vw; white-space: pre-wrap; }
.toast.error { background: var(--danger); }