:root {
  --bg: #0f1216;
  --panel: #171b21;
  --panel-2: #1e232b;
  --line: #2c333d;
  --text: #e6e9ee;
  --muted: #8b95a3;
  --accent: #4da3ff;
  --target: #2ecc71;
  --artery: #ff4d4d;
  --vein: #4d7dff;
  --warn: #f0b429;
  --danger: #ff6b6b;
  --radius: 6px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 13px;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--text); }
button, select, input { font: inherit; color: inherit; }
button {
  background: var(--panel-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 4px 9px; cursor: pointer; white-space: nowrap;
}
button:hover { border-color: var(--muted); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.active { background: var(--accent); border-color: var(--accent); color: #fff; }
button.icon { padding: 2px 6px; background: transparent; border-color: transparent; color: var(--muted); }
button.icon:hover { color: var(--text); border-color: var(--line); }
button.danger:hover { color: var(--danger); border-color: var(--danger); }
button:disabled { opacity: .45; cursor: default; }
select, input[type=text], input[type=password] {
  background: var(--panel-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 4px 6px;
}
kbd {
  font-family: ui-monospace, Menlo, monospace; font-size: 11px; padding: 0 4px;
  border: 1px solid var(--line); border-radius: 3px; background: var(--panel-2);
}

/* ---------- login / admin forms ---------- */
.center-card {
  max-width: 380px; margin: 12vh auto 0; padding: 28px; background: var(--panel);
  border: 1px solid var(--line); border-radius: 10px;
}
.center-card h1 { margin: 0 0 4px; font-size: 20px; }
.center-card p { color: var(--muted); margin: 0 0 18px; }
.center-card label { display: block; margin: 12px 0 4px; color: var(--muted); }
.center-card input { width: 100%; padding: 8px; }
.center-card button { width: 100%; margin-top: 18px; padding: 8px; }
.error { color: var(--danger); min-height: 1.2em; margin-top: 10px; }

/* ---------- viewer layout ---------- */
.app { display: grid; grid-template-columns: 340px 1fr; grid-template-rows: auto 1fr auto; height: 100vh; }
.topbar {
  grid-column: 1 / 3; display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
  padding: 6px 10px; background: var(--panel); border-bottom: 1px solid var(--line);
}
.topbar .brand { font-weight: 600; margin-right: 6px; }
.topbar .group { display: flex; align-items: center; gap: 4px; padding-right: 6px; border-right: 1px solid var(--line); }
.topbar .group:last-child { border-right: 0; }
.topbar .spacer { flex: 1; }
.topbar label { color: var(--muted); }
.topbar input[type=range] { width: 70px; }
.user-row { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 14px; color: var(--muted); }
.user-row strong { color: var(--text); }
.save-status { color: var(--muted); min-width: 70px; text-align: right; }
.save-status.err { color: var(--warn); }

.sidebar { background: var(--panel); border-right: 1px solid var(--line); overflow-y: auto; padding: 10px; }
.sidebar h3 {
  font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted);
  margin: 16px 0 6px; display: flex; justify-content: space-between; align-items: center;
}
.sidebar h3:first-child { margin-top: 0; }
.subject-row { display: flex; gap: 6px; align-items: center; }
.subject-row select { flex: 1; }
.badge { font-size: 11px; padding: 1px 6px; border-radius: 10px; background: var(--panel-2); border: 1px solid var(--line); color: var(--muted); }

.filter { width: 100%; margin-bottom: 6px; }
.target { border: 1px solid transparent; border-radius: var(--radius); margin-bottom: 2px; }
.target.selected { border-color: var(--line); background: var(--panel-2); }
.target-head { display: flex; align-items: center; gap: 6px; padding: 4px 6px; cursor: pointer; border-radius: var(--radius); }
.target-head:hover { background: var(--panel-2); }
.target-head .name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.target-head .hemi { color: var(--muted); font-size: 11px; width: 18px; }
.target-head .best { color: var(--muted); font-size: 11px; }
.dot { width: 10px; height: 10px; border-radius: 50%; flex: none; display: inline-block; }
.dot.target { background: var(--target); }
.dot.struct { background: transparent; border: 2px solid var(--target); }
.dot.artery { background: var(--artery); }
.dot.vein { background: var(--vein); }
.dot.empty { background: transparent; border: 1.5px dashed var(--muted); }

.vessels { padding: 2px 6px 8px 22px; }
.vessel {
  display: grid; grid-template-columns: auto 1fr auto; gap: 2px 6px; align-items: center;
  padding: 5px 6px; border-radius: var(--radius); border: 1px solid transparent; cursor: pointer;
}
.vessel:hover { background: rgba(255,255,255,.03); }
.vessel.active { border-color: var(--accent); background: rgba(77,163,255,.08); }
.vessel .vname { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.vessel .metrics { grid-column: 2 / 4; display: flex; gap: 10px; color: var(--muted); font-size: 12px; }
.vessel .metrics b { color: var(--text); font-weight: 600; }
.vessel .metrics .todo { color: var(--warn); }
.vessel .actions { display: flex; gap: 2px; }
.type-toggle { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.type-toggle button { border: 0; border-radius: 0; padding: 0 7px; font-size: 11px; background: transparent; color: var(--muted); }
.type-toggle button.on.artery { background: var(--artery); color: #fff; }
.type-toggle button.on.vein { background: var(--vein); color: #fff; }
.add-row { display: flex; gap: 6px; margin-top: 4px; }
.add-row button { font-size: 12px; padding: 2px 8px; }
.hint { color: var(--muted); font-size: 12px; line-height: 1.45; }
.steps { margin: 6px 0 0; padding-left: 18px; color: var(--muted); font-size: 12px; line-height: 1.6; }
.steps li.done { color: var(--target); }
.steps li.now { color: var(--text); font-weight: 600; }

.viewport { position: relative; background: #000; overflow: hidden; }
.viewport canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
#overlay { pointer-events: none; }
.tile-select {
  position: absolute; z-index: 5; font-size: 12px; padding: 1px 4px; opacity: .85;
  background: rgba(20,24,30,.85);
}
.tile-select:hover { opacity: 1; }
.loading {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,.6); z-index: 10; font-size: 15px;
}
.loading[hidden] { display: none; }

.statusbar {
  grid-column: 1 / 3; display: flex; gap: 16px; padding: 4px 10px; background: var(--panel);
  border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; font-family: ui-monospace, Menlo, monospace;
}
.statusbar .mode-hint { flex: 1; font-family: inherit; color: var(--text); }

/* manual drawer */
.drawer {
  position: fixed; top: 0; right: 0; bottom: 0; width: min(560px, 100vw); background: var(--panel);
  border-left: 1px solid var(--line); z-index: 50; transform: translateX(100%); transition: transform .2s;
  display: flex; flex-direction: column;
}
.drawer.open { transform: none; }
.drawer header { display: flex; align-items: center; justify-content: space-between; padding: 8px 12px; border-bottom: 1px solid var(--line); }
.drawer iframe { flex: 1; border: 0; width: 100%; background: var(--bg); }

.toast {
  position: fixed; bottom: 40px; left: 50%; transform: translateX(-50%); background: var(--panel-2);
  border: 1px solid var(--line); padding: 8px 14px; border-radius: var(--radius); z-index: 60;
  box-shadow: 0 4px 16px rgba(0,0,0,.4);
}
.toast[hidden] { display: none; }

/* ---------- admin ---------- */
.admin { padding: 16px; }
.admin header { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }
.admin h1 { font-size: 18px; margin: 0 12px 0 0; }
.table-wrap { overflow: auto; border: 1px solid var(--line); border-radius: var(--radius); max-height: calc(100vh - 120px); }
table { border-collapse: collapse; width: 100%; font-size: 12px; }
th, td { padding: 4px 8px; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
th { position: sticky; top: 0; background: var(--panel-2); }
tr.deleted td { color: var(--muted); text-decoration: line-through; }
td.num { text-align: right; font-variant-numeric: tabular-nums; }

@media (max-width: 800px) {
  .app { grid-template-columns: 1fr; grid-template-rows: auto 45vh 1fr auto; }
  .sidebar { grid-row: 3; border-right: 0; border-top: 1px solid var(--line); }
  .viewport { grid-row: 2; }
}

/* visibility controls */
.visibility { display: grid; grid-template-columns: auto auto auto; gap: 4px 6px; align-items: center; margin-bottom: 8px; font-size: 12px; color: var(--muted); }
.visibility button { font-size: 11px; padding: 1px 6px; }
.eye { display: inline-flex; align-items: center; }
.eye svg { width: 15px; height: 15px; }
.eye.off { color: var(--muted); opacity: .6; }
.target.hidden-item .name, .vessel.hidden-item .vname { opacity: .45; text-decoration: line-through; }

/* save confirmation */
.toast.ok { border-color: var(--target); color: var(--target); }
.toast.err { border-color: var(--warn); color: var(--warn); }
dialog {
  background: var(--panel); color: var(--text); border: 1px solid var(--target); border-radius: 10px;
  padding: 20px 24px; max-width: 420px;
}
dialog h2 { margin: 0 0 8px; color: var(--target); font-size: 18px; }
dialog p { color: var(--text); line-height: 1.5; }
dialog::backdrop { background: rgba(0,0,0,.55); }
.notice { max-width: 380px; margin: 8vh auto -8vh; padding: 12px 16px; border: 1px solid var(--target); border-radius: 8px; color: var(--target); background: var(--panel); }

input[type=range] { accent-color: var(--accent); }

/* inline vessel naming */
.vessel .vname { cursor: text; border-radius: 3px; padding: 0 2px; }
.vessel .vname:hover { background: rgba(255,255,255,.07); }
.vessel .vname.unnamed { font-style: italic; color: var(--muted); }
.vname-input { width: 100%; padding: 2px 5px; font-size: 13px; border-color: var(--accent); }
.steps li.clickable { cursor: pointer; }

/* clickable measurements in the vessel row */
.vessel .metric { cursor: pointer; border-bottom: 1px dotted var(--muted); }
.vessel .metric:hover { color: var(--accent); }
.vessel .metric.sel { color: var(--accent); }
.vessel .todo[data-act] { cursor: pointer; }
.vessel .todo[data-act]:hover { text-decoration: underline; }

/* workflow stepper in the toolbar */
.stepper .arrow { color: var(--muted); padding: 0 1px; }
.stepper button.done:not(.active)::after { content: ' ✓'; color: var(--target); }