:root {
  --bg: #f3f5f4;
  --panel: #ffffff;
  --ink: #1f2a37;
  --ink-2: #4b5563;
  --ink-3: #8a94a3;
  --line: #dfe4e2;
  --accent: #0b6e4f;
  --accent-2: #13926a;
  --accent-soft: #e6f2ed;
  --warn: #b45309;
  --warn-soft: #fdf1e3;
  --bad: #b42318;
  --bad-soft: #fdecea;
  --good: #0b6e4f;
  --tube-a: #2563eb;
  --tube-b: #d97706;
  --tube-c: #9333ea;
  --floor: #f7f8f7;
  --bench: #e9dcc7;
  --tray: #cfe8de;
  --wall: #3b4452;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 1px 8px rgba(16, 24, 40, .04);
  --mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); font-size: 15px; line-height: 1.45; }
button { font: inherit; }
.hidden { display: none !important; }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* ---------- header ---------- */
.topbar { display: flex; align-items: center; gap: 16px; padding: 12px 20px; background: var(--ink); color: #fff; position: sticky; top: 0; z-index: 20; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { width: 30px; height: 30px; }
.brand h1 { font-size: 17px; margin: 0; letter-spacing: .2px; }
.brand p { margin: 0; font-size: 12px; color: #a7f3d0; letter-spacing: .6px; text-transform: uppercase; }
.topbar .spacer { flex: 1; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px; background: rgba(255,255,255,.1); font-size: 13px; }
.chip .dot { width: 8px; height: 8px; border-radius: 50%; background: #34d399; }
.chip.offline .dot { background: #fbbf24; }
.chip button { background: none; border: 0; color: #cbd5e1; cursor: pointer; padding: 0 0 0 4px; font-size: 12px; text-decoration: underline; }

/* ---------- layout ---------- */
.layout { display: grid; grid-template-columns: 230px minmax(0, 1fr) 270px; gap: 18px; padding: 18px 20px 40px; max-width: 1500px; margin: 0 auto; }
@media (max-width: 1180px) { .layout { grid-template-columns: 200px minmax(0, 1fr); } .side { grid-column: 1 / -1; } }
@media (max-width: 760px) { .layout { grid-template-columns: 1fr; padding: 12px 12px 30px; } }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.panel h3 { margin: 0 0 8px; font-size: 13px; text-transform: uppercase; letter-spacing: .6px; color: var(--ink-2); }

/* ---------- level nav ---------- */
.levels { display: flex; flex-direction: column; gap: 8px; }
@media (max-width: 760px) { .levels { flex-direction: row; overflow-x: auto; } .lvl { min-width: 150px; } }
.lvl { text-align: left; border: 1px solid var(--line); background: var(--panel); border-radius: var(--radius); padding: 10px 12px; cursor: pointer; display: grid; grid-template-columns: 28px 1fr; gap: 2px 10px; align-items: center; box-shadow: var(--shadow); color: var(--ink); }
.lvl:hover { border-color: var(--accent-2); }
.lvl.active { border-color: var(--accent); background: var(--accent-soft); }
.lvl .num { grid-row: span 2; width: 28px; height: 28px; border-radius: 8px; background: var(--ink); color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 14px; }
.lvl.done .num { background: var(--accent); }
.lvl .name { font-weight: 600; font-size: 14px; }
.lvl .best { font-size: 12px; color: var(--ink-3); }
.lvl.done .best { color: var(--accent); }
.totalbox { margin-top: 6px; padding: 10px 12px; font-size: 13px; color: var(--ink-2); }
.totalbox strong { font-size: 22px; color: var(--ink); display: block; }

/* ---------- stage ---------- */
.stage { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.stage-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.stage-head h2 { margin: 0; font-size: 24px; }
.stage-head .tag { color: var(--ink-2); }
.brief { padding: 14px 16px; display: grid; grid-template-columns: 1.1fr 1fr; gap: 16px; }
@media (max-width: 900px) { .brief { grid-template-columns: 1fr; } }
.brief p { margin: 0; }
.brief ul { margin: 0; padding-left: 18px; }
.brief li { margin-bottom: 4px; font-size: 14px; }
.brief .scoring { margin-top: 10px; padding: 8px 10px; background: var(--accent-soft); border-radius: 8px; font-size: 14px; }
.board { padding: 14px; overflow: auto; }
.board svg { display: block; width: 100%; height: auto; user-select: none; -webkit-user-select: none; touch-action: none; }
.controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding: 10px 14px; }
.controls .grow { flex: 1; }
.metrics { display: flex; gap: 14px; flex-wrap: wrap; font-size: 14px; color: var(--ink-2); }
.metrics b { color: var(--ink); font-family: var(--mono); font-size: 16px; }
.btn { border: 1px solid var(--line); background: #fff; color: var(--ink); border-radius: 8px; padding: 7px 12px; cursor: pointer; font-weight: 500; font-size: 14px; white-space: nowrap; }
.btn:hover:not(:disabled) { border-color: var(--ink-3); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover:not(:disabled) { background: var(--accent-2); }
.btn.small { padding: 4px 9px; font-size: 13px; }
.btn.sel { border-color: var(--accent); background: var(--accent-soft); }
.debrief { padding: 14px 16px; border-left: 4px solid var(--accent); }
.debrief h4 { margin: 0 0 6px; font-size: 16px; }
.debrief p { margin: 0; color: var(--ink-2); }
.debrief .kicker { font-size: 12px; text-transform: uppercase; letter-spacing: .6px; color: var(--accent); font-weight: 700; margin-bottom: 2px; }
.note { font-size: 13px; color: var(--ink-3); }

/* ---------- side ---------- */
.side { display: flex; flex-direction: column; gap: 14px; }
.side .panel { padding: 12px 14px; }
.online { display: flex; flex-wrap: wrap; gap: 6px; }
.online .who { font-size: 13px; padding: 3px 9px; border-radius: 999px; background: var(--accent-soft); color: var(--ink); }
.online .who small { color: var(--accent); font-weight: 600; margin-left: 4px; }
.online .who.me { outline: 1.5px solid var(--accent); }
table.lb { width: 100%; border-collapse: collapse; font-size: 13px; }
table.lb td, table.lb th { padding: 5px 4px; border-bottom: 1px solid var(--line); text-align: left; }
table.lb th { font-weight: 600; color: var(--ink-3); font-size: 11px; text-transform: uppercase; letter-spacing: .5px; }
table.lb td.n { text-align: right; font-family: var(--mono); }
table.lb tr.me td { background: var(--accent-soft); font-weight: 600; }
.empty { color: var(--ink-3); font-size: 13px; }

/* ---------- toast & modal ---------- */
.toasts { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; gap: 8px; z-index: 50; align-items: center; pointer-events: none; }
.toast { background: var(--ink); color: #fff; padding: 9px 14px; border-radius: 8px; box-shadow: 0 6px 20px rgba(0,0,0,.2); font-size: 14px; max-width: 90vw; animation: pop .18s ease-out; }
.toast.bad { background: var(--bad); }
.toast.good { background: var(--accent); }
@keyframes pop { from { transform: translateY(8px); opacity: 0; } to { transform: none; opacity: 1; } }
.modal { position: fixed; inset: 0; background: rgba(15, 23, 32, .55); display: grid; place-items: center; z-index: 40; padding: 16px; }
.modal .card { background: #fff; border-radius: 14px; padding: 24px; width: min(460px, 100%); box-shadow: 0 20px 50px rgba(0,0,0,.25); }
.modal h2 { margin: 0 0 6px; }
.modal p { color: var(--ink-2); margin: 0 0 14px; }
.modal input { width: 100%; font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; margin-bottom: 10px; }
.modal input:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.modal .err { color: var(--bad); font-size: 13px; min-height: 18px; margin-bottom: 8px; }

.shake { animation: shake .3s; }
@keyframes shake { 20%, 60% { transform: translateX(-4px); } 40%, 80% { transform: translateX(4px); } }

/* ---------- level-specific bits ---------- */
.legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: 13px; color: var(--ink-2); margin-top: 8px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 14px; height: 14px; border-radius: 3px; display: inline-block; border: 1px solid rgba(0,0,0,.08); }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.timeline { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 10px; }
.timeline .ev { font-family: var(--mono); font-size: 12px; padding: 3px 6px; border-radius: 5px; background: #eef1f0; color: var(--ink-3); }
.timeline .ev.pick { background: #efe7fb; }
.timeline .ev.chg { background: #fdf1e3; color: var(--warn); }
.timeline .ev.done { opacity: .45; text-decoration: line-through; }
.timeline .ev.next { background: var(--ink); color: #fff; opacity: 1; }
svg text { font-family: var(--sans); }
svg .mono { font-family: var(--mono); }
.clickable { cursor: pointer; }