/* Colours = makeTheme() from src/App.jsx. */
:root {
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono-font: ui-monospace, "SF Mono", "Cascadia Code", Menlo, monospace;
  --demo-bar: 32px;
  --topbar: 47px;
  --bg: #ffffff; --panel: #fbfbfb; --mono: #f5f5f5; --border: #d9d9d9;
  --text: #1a1a1a; --muted: #6b6b6b; --good: #15803d; --bad: #b91c1c;
  --fill: #1a1a1a; --fill-text: #ffffff; --accent: #3b51c9;
  --shadow: 0 8px 24px rgba(20, 24, 60, .12);
}
:root[data-theme="dark"] {
  --bg: #0d0d0d; --panel: #171717; --mono: #1a1a1a; --border: #333333;
  --text: #e8e8e8; --muted: #8f8f8f; --good: #4ade80; --bad: #f87171;
  --fill: #e8e8e8; --fill-text: #0d0d0d; --accent: #8ba4ff;
  --shadow: 0 8px 24px rgba(0, 0, 0, .5);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 14px/1.45 var(--font); padding-top: var(--demo-bar); overflow-x: hidden; }
button, input, select, textarea { font-family: var(--font); }
code { font-family: var(--mono-font); font-size: 11.5px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }

/* ── demo bar ── */
.demo-bar { position: fixed; top: 0; left: 0; right: 0; height: var(--demo-bar); z-index: 100; display: flex; align-items: center; gap: 14px;
  padding: 0 16px; background: #111418; color: #c9ced6; font-size: 12px; border-bottom: 1px solid #262c34; }
.demo-bar a { color: #e9ecef; text-decoration: none; font-weight: 600; white-space: nowrap; }
.demo-bar a:hover { text-decoration: underline; }
.demo-title { font-weight: 600; color: #fff; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
.demo-note { color: #8a939f; white-space: nowrap; }
.demo-bar .spacer { flex: 1; }
.demo-bar button { background: transparent; color: #e9ecef; border: 1px solid #3a414b; border-radius: 4px; font-size: 11px; padding: 3px 10px; cursor: pointer; white-space: nowrap; }
.demo-bar button:hover { background: #262c34; }

/* ── app top bar ── */
.topbar { position: sticky; top: var(--demo-bar); z-index: 20; background: var(--bg); border-bottom: 1px solid var(--border);
  padding: 10px 20px; display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.tabs { display: flex; gap: 4px; flex-wrap: wrap; }
.tab { border: none; background: transparent; color: var(--muted); border-radius: 5px; padding: 6px 11px; font-size: 12px; font-weight: 600; cursor: pointer; }
.tab:hover { color: var(--text); }
.tab.on { background: var(--fill); color: var(--fill-text); }
.top-right { display: flex; align-items: center; gap: 10px; }
.streak { font-size: 11.5px; color: var(--muted); white-space: nowrap; }
.streak b { color: var(--accent); font-variant-numeric: tabular-nums; }
.theme { border: 1px solid var(--border); background: transparent; color: var(--muted); border-radius: 5px; padding: 5px 10px; font-size: 11px; font-weight: 600; cursor: pointer; }

/* ── layout ── */
.wrap { max-width: 760px; margin: 0 auto; padding: 24px 20px 80px; }
.wrap.wide { max-width: 900px; }
.head { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
h1 { font-size: 20px; font-weight: 700; margin: 0 0 4px; }
.sub { color: var(--muted); font-size: 12px; margin-bottom: 14px; }
.head-tools { display: flex; gap: 8px; align-items: center; }
.seg { display: flex; gap: 2px; border: 1px solid var(--border); border-radius: 6px; padding: 2px; }
.seg button { border: none; background: transparent; color: var(--muted); border-radius: 4px; padding: 4px 12px; font-size: 11.5px; font-weight: 700; cursor: pointer; }
.seg button.on { background: var(--fill); color: var(--fill-text); }

/* ── controls ── */
.btn { border: 1px solid var(--border); background: transparent; color: var(--text); border-radius: 4px; padding: 5px 10px;
  font-size: 11.5px; font-weight: 600; cursor: pointer; }
.btn:disabled { opacity: .5; cursor: default; }
.btn.solid { background: var(--fill); color: var(--fill-text); border-color: var(--fill); }
.btn.good { border-color: var(--good); color: var(--good); }
.btn.bad { border-color: var(--bad); color: var(--bad); }
.btn.fillgood { background: var(--good); color: var(--fill-text); }
.btn.big { padding: 10px 14px; }
.btn.pad { padding: 8px 16px; }
.btn.wide { width: 100%; padding: 8px 0; }
.lvl { border: 1px solid var(--border); background: transparent; color: var(--text); border-radius: 4px; padding: 3px 9px; font-size: 11.5px; font-weight: 600; cursor: pointer; }
.lvl.on { border-color: var(--text); background: var(--fill); color: var(--fill-text); }
select { background: var(--panel); color: var(--text); border: 1px solid var(--border); border-radius: 4px; padding: 4px 6px; font-size: 11.5px; max-width: 240px; min-width: 0; }
.search { flex: 1; min-width: 130px; padding: 5px 8px; border-radius: 4px; border: 1px solid var(--border); background: var(--mono); color: var(--text); font-size: 12px; }
.check { display: flex; align-items: center; gap: 5px; font-size: 12px; cursor: pointer; }
.linkish { background: none; border: none; padding: 0; color: var(--text); text-decoration: underline; cursor: pointer; font: inherit; }

.filters { border: 1px solid var(--border); border-radius: 6px; padding: 12px; margin-bottom: 16px; display: grid; gap: 10px; }
.filters .row, .row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.filters.row-only { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.lbl { font-size: 11.5px; font-weight: 700; color: var(--muted); }

/* ── Leitner boxes strip ── */
.boxes { display: flex; align-items: flex-end; gap: 6px; margin: -4px 0 16px; flex-wrap: wrap; }
.box { width: 30px; text-align: center; }
.box .bar { height: 26px; display: flex; align-items: flex-end; background: var(--mono); border: 1px solid var(--border); border-radius: 3px; overflow: hidden; }
.box .bar span { display: block; width: 100%; background: var(--muted); min-height: 0; }
.box.mastered .bar span { background: var(--good); }
.box .bn { font-size: 10px; font-weight: 700; color: var(--muted); margin-top: 2px; }
.box .bc { font-size: 10px; color: var(--muted); font-variant-numeric: tabular-nums; }
.boxes-legend { font-size: 10.5px; color: var(--muted); margin-left: 6px; align-self: center; flex: 1; min-width: 180px; }

/* ── tickets ── */
.group { margin-bottom: 26px; }
.group-head { font-size: 15px; font-weight: 700; border-bottom: 1px solid var(--border); padding-bottom: 6px; margin: 0 0 12px;
  position: sticky; top: calc(var(--demo-bar) + var(--topbar)); background: var(--bg); z-index: 5; }
.group-head span { font-weight: 400; color: var(--muted); }
.ticket { border: 1px solid var(--border); border-radius: 6px; background: var(--panel); padding: 14px; margin-bottom: 12px; scroll-margin-top: 120px; }
.t-title { display: flex; align-items: flex-start; gap: 8px; margin-bottom: 8px; }
.t-title input { margin-top: 3px; }
.t-num { font-weight: 700; font-size: 12.5px; margin-right: 8px; }
.t-text { font-size: 14px; font-weight: 600; overflow-wrap: anywhere; }
.t-text.done { text-decoration: line-through; color: var(--muted); }
.t-meta { display: flex; gap: 6px; align-items: center; margin-bottom: 10px; flex-wrap: wrap; }
.chip { border: 1px solid var(--border); border-radius: 3px; padding: 1px 7px; font-size: 10.5px; color: var(--muted); }
.chip.solid { background: var(--fill); color: var(--fill-text); border-color: var(--fill); font-weight: 700; padding: 1px 7px; }
.meta { color: var(--muted); font-size: 11.5px; margin-left: 4px; }
.t-note { color: var(--muted); font-size: 11px; margin-top: 8px; font-style: italic; }
.label { font-size: 10.5px; font-weight: 700; color: var(--muted); letter-spacing: .4px; margin-bottom: 6px; }
.mono { background: var(--mono); border: 1px solid var(--border); border-radius: 5px; padding: 12px; font: 13px/1.7 var(--mono-font);
  white-space: pre-wrap; overflow-wrap: anywhere; margin-bottom: 10px; }
.mono.page { font-size: 12px; line-height: 1.55; max-height: 460px; overflow: auto; }
.blank { font-weight: 700; border-bottom: 2px solid currentColor; }
.reveal-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.reveal-row .label { margin: 0; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.opt { border: 1px solid var(--border); color: var(--text); background: transparent; border-radius: 4px; padding: 8px 4px; font-weight: 600; font-size: 12.5px; cursor: pointer; }
.opt:hover:not(:disabled) { border-color: var(--muted); }
.opt:disabled { cursor: default; }
.opt.is-good { border-color: var(--good); color: var(--good); }
.opt.is-bad { border-color: var(--bad); color: var(--bad); }
.opt.is-muted { color: var(--muted); }
.answer-row { display: flex; gap: 8px; }
.answer { flex: 1; min-width: 0; padding: 8px 10px; border-radius: 4px; border: 1px solid var(--border); background: var(--mono); color: var(--text); font: 13px var(--mono-font); }
.answer.is-good { border-color: var(--good); }
.answer.is-bad { border-color: var(--bad); }
.btn.ok { padding: 0 14px; }
.feedback { font-size: 12px; margin-top: 6px; }
.good-text { color: var(--good); }
.bad-text { color: var(--bad); }
.muted-text { color: var(--muted); }
.strong { font-weight: 600; }
.small { font-size: 11.5px; }
.empty { color: var(--muted); font-size: 13px; font-style: italic; }

/* ── study deck ── */
.deck-head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.deck-head .count { font-size: 12px; font-weight: 700; font-variant-numeric: tabular-nums; white-space: nowrap; }
.progress { flex: 1; height: 5px; border-radius: 3px; background: var(--mono); border: 1px solid var(--border); overflow: hidden; }
.progress span { display: block; height: 100%; background: var(--accent); transition: width .25s; }
.flip-scene { perspective: 1600px; cursor: pointer; border-radius: 14px; }
.flip { position: relative; height: clamp(240px, 42vh, 360px); transform-style: preserve-3d; transition: transform .5s cubic-bezier(.2, .75, .3, 1); }
.flip.flipped { transform: rotateX(180deg); }
.face { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; display: flex; flex-direction: column;
  padding: 14px 16px 16px; border-radius: 14px; border: 1px solid var(--border); background: var(--panel); box-shadow: var(--shadow); overflow: hidden; }
.face.back { transform: rotateX(180deg); }
.face-top { display: flex; justify-content: space-between; align-items: center; min-height: 28px; }
.face-top .label { margin: 0; }
.speak { border: 1px solid var(--border); background: transparent; color: var(--muted); border-radius: 20px; width: 28px; height: 28px; font-size: 13px; cursor: pointer; line-height: 1; }
.speak:hover { color: var(--text); }
.face-body { flex: 1; display: flex; align-items: center; justify-content: center; overflow: auto; padding: 6px 4px; }
.face-text { font-size: clamp(20px, 3.4vw, 30px); font-weight: 600; text-align: center; line-height: 1.4; overflow-wrap: anywhere; }
.face-text.long { font-size: clamp(15px, 2.4vw, 19px); }
.face-hint { font-size: 10.5px; color: var(--muted); text-align: center; }
.deck-meta { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; margin: 10px 0 14px; }
.grow { flex: 1; }
.deck-controls { display: grid; grid-template-columns: auto 1fr 1fr auto; gap: 8px; }
.kbd-hint { color: var(--muted); font-size: 11px; text-align: center; margin-top: 8px; }
.deck-done { border: 1px solid var(--border); border-radius: 14px; background: var(--panel); box-shadow: var(--shadow); padding: 40px 24px; text-align: center; }
.big-title { font-size: 24px; font-weight: 700; margin-bottom: 6px; }
.done-actions { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-top: 18px; }

/* ── materials ── */
.mat { border: 1px solid var(--border); border-radius: 6px; background: var(--panel); padding: 14px; margin-bottom: 12px; scroll-margin-top: 100px; }
.mat-top { display: flex; justify-content: space-between; gap: 10px; align-items: flex-start; flex-wrap: wrap; }
.mat-main { flex: 1; min-width: 220px; }
.mat-title { background: none; border: none; padding: 0; color: var(--text); font-size: 14px; font-weight: 600; cursor: pointer; text-align: left; }
.mat-main .t-meta { margin: 6px 0 0; }
.mat-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.mat-link { font-size: 11.5px; margin-top: 6px; }
.mat-body { margin-top: 12px; }
.derived { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 10px; }
.add-form { border: 1px solid var(--accent); border-radius: 6px; padding: 12px; margin-bottom: 16px; display: grid; gap: 10px; background: var(--panel); }
.add-form .label { margin: 0; }
.add-form textarea { width: 100%; border: 1px solid var(--border); border-radius: 5px; background: var(--mono); color: var(--text); padding: 10px; font: 12.5px/1.6 var(--mono-font); resize: vertical; }
.report { font-size: 12.5px; border-top: 1px solid var(--border); padding-top: 10px; }

/* ── notes ── */
.notes { width: 100%; min-height: 420px; resize: vertical; border: 1px solid var(--border); border-radius: 6px; background: var(--panel); color: var(--text); padding: 14px; font: 13px/1.6 var(--mono-font); }

/* ── tour + toast ── */
.tour { position: fixed; top: calc(var(--demo-bar) + 10px); right: 16px; z-index: 101; width: min(340px, calc(100vw - 32px)); background: var(--panel);
  color: var(--text); border: 1px solid var(--border); border-top: 3px solid var(--accent); border-radius: 8px; box-shadow: var(--shadow); padding: 16px; }
.tour h3 { font-size: 14px; margin: 0 0 6px; }
.tour p { font-size: 13px; margin: 0 0 12px; }
.tour-foot { display: flex; justify-content: space-between; gap: 8px; }
.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); z-index: 102; background: var(--fill); color: var(--fill-text);
  padding: 8px 14px; border-radius: 6px; font-size: 12.5px; box-shadow: var(--shadow); max-width: calc(100vw - 32px); }

@media (max-width: 640px) {
  .topbar { position: static; }
  .group-head { top: var(--demo-bar); }
  .demo-bar { gap: 10px; padding: 0 10px; }
  .demo-note { display: none; }
  .topbar { padding: 8px 16px; }
  .wrap { padding: 18px 16px 60px; }
  .streak { white-space: normal; }
  .deck-head { flex-wrap: wrap; }
  .progress { min-width: 120px; }
  .deck-controls { grid-template-columns: auto 1fr 1fr auto; }
  .btn.big { padding: 10px; }
}
@media (prefers-reduced-motion: reduce) {
  .flip, .progress span { transition: none; }
}