:root {
  --green: #14532d;
  --green-2: #166534;
  --green-soft: #dcfce7;
  --red: #b91c1c;
  --red-soft: #fee2e2;
  --amber-soft: #fef3c7;
  --ink: #1c1917;
  --muted: #57534e;
  --line: #e7e5e4;
  --bg: #fafaf9;
  --card: #ffffff;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --green-soft: #14532d55; --red-soft: #7f1d1d55; --amber-soft: #78350f55;
    --ink: #f5f5f4; --muted: #a8a29e; --line: #44403c; --bg: #1c1917; --card: #292524;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.top {
  position: sticky; top: 0; z-index: 2; display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; background: var(--green); color: #fff;
}
.brand { font-weight: 700; letter-spacing: .2px; }
.logo { display: inline-block; transform: scaleX(1.3); margin-right: 4px; }
.top-right { display: flex; gap: 10px; align-items: center; }
.top select { background: transparent; color: #fff; border: 1px solid #ffffff66; border-radius: 8px; padding: 4px 6px; }
.top select option { color: #000; }
.link { background: none; border: 0; color: inherit; text-decoration: underline; font: inherit; cursor: pointer; padding: 4px; }

main { max-width: 640px; margin: 0 auto; padding: 16px 16px 96px; }
h1 { font-size: 1.35rem; margin: 8px 0 4px; }
h2 { font-size: 1.05rem; margin: 22px 0 8px; }
p.muted, .muted { color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin: 12px 0; }

label { display: block; font-weight: 600; margin: 14px 0 6px; }
input[type=text], input[type=password], input[inputmode] {
  width: 100%; font-size: 1.05rem; padding: 12px; border: 1px solid var(--line); border-radius: 10px;
  background: var(--card); color: var(--ink);
}
input:focus-visible, button:focus-visible, .opt:focus-within { outline: 3px solid #22c55e88; outline-offset: 1px; }
.btn {
  display: block; width: 100%; margin-top: 18px; padding: 14px; border: 0; border-radius: 12px;
  background: var(--green-2); color: #fff; font: 600 1.05rem/1 inherit; cursor: pointer;
}
.btn.secondary { background: transparent; color: var(--green-2); border: 2px solid var(--green-2); }
@media (prefers-color-scheme: dark) { .btn.secondary { color: #86efac; border-color: #86efac; } }
.btn:disabled { opacity: .5; cursor: default; }
.err { background: var(--red-soft); color: var(--red); border-radius: 10px; padding: 10px 12px; margin-top: 12px; }
@media (prefers-color-scheme: dark) { .err { color: #fecaca; } }

.task { display: flex; gap: 12px; align-items: center; }
.task .grow { flex: 1; min-width: 0; }
.task .title { font-weight: 600; }
.tag { display: inline-block; font-size: .78rem; padding: 2px 8px; border-radius: 99px; background: var(--amber-soft); margin-right: 6px; }
.bar { height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; margin-top: 8px; }
.bar > span { display: block; height: 100%; background: var(--green-2); }
.task .go { flex: none; padding: 10px 14px; border-radius: 10px; border: 0; background: var(--green-2); color: #fff; font-weight: 600; cursor: pointer; }
.done-badge { flex: none; color: var(--green-2); font-weight: 700; }

.progress-head { display: flex; justify-content: space-between; align-items: baseline; color: var(--muted); font-size: .9rem; }
.passage { white-space: pre-wrap; background: var(--card); border-left: 4px solid var(--green-2); padding: 12px; border-radius: 8px; margin: 12px 0; }
.stem { font-size: 1.12rem; margin: 14px 0; }
.opt {
  display: flex; gap: 12px; align-items: center; padding: 14px; margin: 10px 0; border: 2px solid var(--line);
  border-radius: 12px; background: var(--card); cursor: pointer;
}
.opt input { width: 20px; height: 20px; accent-color: var(--green-2); }
.opt.picked { border-color: var(--green-2); background: var(--green-soft); }
.nav { position: fixed; left: 0; right: 0; bottom: 0; background: var(--card); border-top: 1px solid var(--line); padding: 10px 16px calc(10px + env(safe-area-inset-bottom)); }
.nav-inner { max-width: 640px; margin: 0 auto; display: flex; gap: 10px; }
.nav .btn { margin: 0; }

.score { font-size: 2.2rem; font-weight: 800; margin: 4px 0; }
.res { border-left: 5px solid var(--line); }
.res.ok { border-left-color: var(--green-2); }
.res.bad { border-left-color: var(--red); }
.res .verdict { font-weight: 700; }
.res.ok .verdict { color: var(--green-2); }
.res.bad .verdict { color: var(--red); }
@media (prefers-color-scheme: dark) { .res.ok .verdict { color: #86efac; } .res.bad .verdict { color: #fca5a5; } }
.why { background: var(--red-soft); border-radius: 8px; padding: 8px 10px; margin-top: 8px; }
.sol { background: var(--green-soft); border-radius: 8px; padding: 8px 10px; margin-top: 8px; }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 2px 10px; margin-top: 6px; font-size: .95rem; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; }

.topic-row { display: flex; justify-content: space-between; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.topic-row:last-child { border-bottom: 0; }
.dot { flex: none; width: 10px; height: 10px; border-radius: 99px; margin-top: 7px; }
.dot.m { background: var(--green-2); } .dot.w { background: #f59e0b; } .dot.l { background: var(--red); }
.center { text-align: center; }
.spinner { margin: 40px auto; width: 32px; height: 32px; border: 4px solid var(--line); border-top-color: var(--green-2); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* SPEC-2 additions */
body.big { font-size: 19px; }
body.big .stem { font-size: 1.3rem; }
.small { font-size: .88rem; }
.who { display: flex; justify-content: space-between; align-items: center; font-size: .85rem; color: var(--muted); }
.inline { display: flex; align-items: center; gap: 8px; font-weight: 400; margin: 12px 0 0; }
.inline input { width: 18px; height: 18px; accent-color: var(--green-2); }
.actions { margin-top: 16px; }
.pill { display: inline-block; padding: 4px 10px; border-radius: 99px; background: var(--amber-soft); font-size: .85rem; margin-bottom: 8px; }
.pill.sc { background: var(--green-soft); }
.notice { border-left: 4px solid var(--green-2); }
.rule ul { padding-left: 20px; margin: 8px 0 0; }
.rule li { margin: 4px 0; }
.st { font-size: .85rem; white-space: nowrap; }
.st-mastered { color: var(--green-2); }
.st-needs_refresh { color: #b45309; }
.good { color: var(--green-2); font-weight: 600; }
@media (prefers-color-scheme: dark) { .st-mastered, .good { color: #86efac; } .st-needs_refresh { color: #fcd34d; } }

/* ───────── staff page (/staff) ───────── */
body.staff main { max-width: 1180px; }
.staff .narrow { max-width: 420px; margin: 24px auto; }
.tabs { max-width: 1180px; margin: 0 auto; padding: 8px 16px 0; display: flex; gap: 4px; flex-wrap: wrap; border-bottom: 1px solid var(--line); }
.tab { border: 0; background: none; padding: 10px 14px; font: inherit; color: var(--muted); cursor: pointer; border-bottom: 3px solid transparent; }
.tab.on { color: var(--ink); font-weight: 600; border-bottom-color: var(--green-2); }
.toolbar { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin: 8px 0; }
.toolbar input, .toolbar select { width: auto; margin: 0; }
.scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 12px 0; }
.grid-table { border-collapse: collapse; width: 100%; font-size: .9rem; background: var(--card); }
.grid-table th, .grid-table td { border-bottom: 1px solid var(--line); padding: 8px; text-align: left; vertical-align: top; }
.grid-table thead th { font-size: .8rem; color: var(--muted); font-weight: 600; white-space: nowrap; }
.grid-table .num { text-align: right; font-variant-numeric: tabular-nums; }
.grid-table tr.flag > * { background: var(--amber-soft); }
.status-grid td { text-align: center; font-weight: 700; padding: 6px 4px; }
.status-grid thead th { vertical-align: bottom; padding: 4px; }
.status-grid .vert { writing-mode: vertical-rl; transform: rotate(180deg); max-height: 170px; overflow: hidden; display: inline-block; }
.st-stuck { color: var(--red); }
.st-learning { color: var(--muted); }
.st-not_started { color: var(--muted); opacity: .45; }
.chip { display: inline-block; font-size: .78rem; padding: 2px 8px; border-radius: 99px; background: var(--amber-soft); margin: 0 4px 4px 0; }
.warn-soft { border-left: 4px solid #d97706; }
.plain { list-style: none; padding: 0; margin: 0; }
.plain li { padding: 8px 0; border-bottom: 1px solid var(--line); }
.small-btn { width: auto; display: inline-block; padding: 6px 12px; margin: 4px 0; font-size: .9rem; }
.missed { border-bottom: 1px solid var(--line); padding: 8px 0; }
.missed .stem { margin: 0 0 4px; }
.bad-text { color: var(--red); }
.dim { opacity: .65; }
input.short { width: 5em; }
@media (prefers-color-scheme: dark) { .grid-table tr.flag > * { background: #422006; } .bad-text, .st-stuck { color: #fca5a5; } }