:root {
  --bg: #f5f7f4; --card: #ffffff; --ink: #18211c; --mute: #56645c; --line: #dde4de;
  --acc: #1f6f4a; --acc-ink: #ffffff; --acc-soft: #e2f0e8;
  --ok: #17703f; --okbg: #e3f4e9; --bad: #b3261e; --badbg: #fbe9e7; --warn: #8a5a00;
  --chip: #edf2ee; --track: #e3e9e4; --tick: #18211c;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1411; --card: #161f1a; --ink: #e5ebe7; --mute: #9aa8a0; --line: #28342d;
    --acc: #4cc38a; --acc-ink: #07130d; --acc-soft: #173326;
    --ok: #5fd197; --okbg: #143222; --bad: #ff8a80; --badbg: #3a1b18; --warn: #e3b341;
    --chip: #1e2a23; --track: #24302a; --tick: #e5ebe7;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0e1411; --card: #161f1a; --ink: #e5ebe7; --mute: #9aa8a0; --line: #28342d;
  --acc: #4cc38a; --acc-ink: #07130d; --acc-soft: #173326;
  --ok: #5fd197; --okbg: #143222; --bad: #ff8a80; --badbg: #3a1b18; --warn: #e3b341;
  --chip: #1e2a23; --track: #24302a; --tick: #e5ebe7;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
}
a { color: var(--acc); }
code { font-size: .9em; background: var(--chip); padding: 1px 5px; border-radius: 4px; }
h2 { font-size: 1.15rem; margin: 0 0 .6rem; }
h3 { font-size: .95rem; margin: 1rem 0 .4rem; color: var(--mute); font-weight: 600; }
h3 small { font-weight: 400; }

.bar {
  position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 12px;
  padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; text-decoration: none; color: var(--ink); }
.count { margin-left: auto; font-size: .9rem; color: var(--mute); font-variant-numeric: tabular-nums; }
.tabs {
  display: flex; gap: 4px; overflow-x: auto; padding: 8px 16px; background: var(--card);
  border-bottom: 1px solid var(--line); scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tabs a {
  flex: 0 0 auto; padding: 6px 12px; border-radius: 999px; text-decoration: none;
  color: var(--mute); font-size: .92rem; font-weight: 600;
}
.tabs a.on { background: var(--acc-soft); color: var(--acc); }

main { max-width: 780px; margin: 0 auto; padding: 16px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 16px; margin: 0 0 14px;
}
.note { color: var(--mute); font-size: .88rem; }
.warn { color: var(--warn); font-weight: 600; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 12px; }
.row .note { flex: 1 1 200px; }

.btn {
  display: inline-flex; align-items: center; gap: 6px; min-height: 42px; padding: 8px 16px;
  border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--ink);
  font: inherit; font-weight: 600; cursor: pointer;
}
.btn:hover { border-color: var(--acc); }
.btn.primary { background: var(--acc); color: var(--acc-ink); border-color: var(--acc); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--mute); }
.btn.danger { color: var(--bad); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn:focus-visible, .opt:focus-visible, .pill:focus-visible, .icon:focus-visible { outline: 3px solid var(--acc); outline-offset: 2px; }
.icon { background: none; border: 0; font-size: 1.15rem; cursor: pointer; padding: 6px; border-radius: 8px; color: var(--ink); line-height: 0; }
.icon svg { display: block; }
.icon.flag { filter: grayscale(1); opacity: .45; }
.icon.flag.on, .icon.on { filter: none; opacity: 1; background: var(--chip); }

.hero-num { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 4px; }
.big { font-size: 2.6rem; font-weight: 800; line-height: 1.1; font-variant-numeric: tabular-nums; }
.of { color: var(--mute); }
.hero-sub { margin-bottom: 10px; }

.meter { position: relative; height: 10px; background: var(--track); border-radius: 999px; margin: 6px 0; }
.meter span { display: block; height: 100%; background: var(--acc); border-radius: 999px; min-width: 2px; }
.meter i { position: absolute; top: -4px; width: 2px; height: 18px; background: var(--tick); border-radius: 1px; }
.progress-line { display: flex; align-items: center; gap: 10px; margin-top: 12px; }
.progress-line .meter { flex: 1; }
.progress-line span { font-size: .85rem; color: var(--mute); font-variant-numeric: tabular-nums; }
.grow { margin: 12px 0; }
.gl { display: flex; justify-content: space-between; gap: 8px; flex-wrap: wrap; font-size: .93rem; }
.gl span { color: var(--mute); font-variant-numeric: tabular-nums; }
.sub { font-size: .82rem; color: var(--mute); }
.btns { display: flex; flex-wrap: wrap; gap: 8px; }

.pills { display: flex; flex-wrap: wrap; gap: 6px; }
.pill {
  border: 1px solid var(--line); background: var(--card); color: var(--ink); border-radius: 999px;
  padding: 6px 12px; font: inherit; font-size: .9rem; cursor: pointer;
}
.pill small { color: var(--mute); }
.pill.on { background: var(--acc); border-color: var(--acc); color: var(--acc-ink); }
.pill.on small { color: inherit; opacity: .8; }
.card > .btn.primary { margin-top: 16px; }
.topics { display: grid; gap: 4px; }
.topic { display: flex; align-items: center; gap: 10px; padding: 8px; border-radius: 8px; cursor: pointer; }
.topic:hover { background: var(--chip); }
.topic input { width: 18px; height: 18px; accent-color: var(--acc); flex: none; }
.tn { flex: 1; }
.tm { font-size: .8rem; color: var(--mute); white-space: nowrap; }
.check { display: flex; gap: 8px; align-items: center; margin-top: 12px; }
.check input { width: 18px; height: 18px; accent-color: var(--acc); }

.quiz .qhead { display: flex; justify-content: space-between; font-size: .88rem; color: var(--mute); font-variant-numeric: tabular-nums; }
.qmeta { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin: 8px 0; }
.chip { display: inline-block; font-size: .78rem; background: var(--chip); color: var(--mute); padding: 2px 8px; border-radius: 6px; }
.qtext { font-size: 1.08rem; font-weight: 500; margin: 6px 0 14px; }
.opts { display: grid; gap: 8px; }
.opt {
  display: flex; gap: 12px; align-items: flex-start; text-align: left; width: 100%;
  padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 12px; background: var(--card);
  color: var(--ink); font: inherit; cursor: pointer;
}
.opt:hover:not(:disabled) { border-color: var(--acc); }
.opt .k {
  flex: none; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center;
  background: var(--chip); font-weight: 700; font-size: .85rem;
}
.opt.sel { border-color: var(--acc); background: var(--acc-soft); }
.opt.sel .k { background: var(--acc); color: var(--acc-ink); }
.opt.ok { border-color: var(--ok); background: var(--okbg); }
.opt.ok .k { background: var(--ok); color: var(--card); }
.opt.bad { border-color: var(--bad); background: var(--badbg); }
.opt.bad .k { background: var(--bad); color: var(--card); }
.opt.dim { opacity: .6; }
.opt:disabled { cursor: default; }
.expl { margin-top: 12px; padding: 12px 14px; border-radius: 12px; border-left: 4px solid; }
.expl.ok { border-color: var(--ok); background: var(--okbg); }
.expl.bad { border-color: var(--bad); background: var(--badbg); }
.timer { font-weight: 700; color: var(--ink); }
.timer.low { color: var(--bad); }
.palette { margin-top: 14px; }
.palette summary { cursor: pointer; color: var(--mute); font-size: .9rem; }
.cells { display: grid; grid-template-columns: repeat(auto-fill, minmax(38px, 1fr)); gap: 6px; margin-top: 8px; }
.cell { height: 34px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--ink); font: inherit; font-size: .8rem; cursor: pointer; }
.cell.done { background: var(--acc-soft); border-color: var(--acc); }
.cell.mk { box-shadow: inset 0 -3px 0 var(--warn); }
.cell.cur { outline: 2px solid var(--ink); }

.rev { padding-left: 1.3rem; margin: 0; }
.rev li { padding: 10px 0; border-bottom: 1px solid var(--line); }
.rev li:last-child { border-bottom: 0; }
.rev .icon { float: right; margin-top: -4px; }
.ans { color: var(--ok); font-weight: 600; margin-top: 4px; }
.yours { color: var(--bad); margin-top: 4px; }
.filters { display: flex; gap: 8px; flex-wrap: wrap; }
.filters input { flex: 1 1 220px; }
input[type="search"], input[type="number"], input[type="date"], select {
  font: inherit; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg); color: var(--ink); min-height: 40px;
}
.form { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; }
.form label { display: grid; gap: 4px; font-size: .9rem; }
.form small { color: var(--mute); }

.tablewrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .88rem; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 7px 8px; border-bottom: 1px solid var(--line); }
th { color: var(--mute); font-weight: 600; }
td a { text-decoration: none; }

.chart { width: 100%; height: auto; }
.chart .b { fill: var(--acc); }
.chart .hit { fill: transparent; }
.chart g:hover .b { opacity: .8; }
.chart .ax { stroke: var(--line); }
.chart text { fill: var(--mute); font-size: 11px; }

.pyqref { margin-top: 10px; padding: 10px 12px; border-radius: 10px; background: var(--chip); font-size: .9rem; }
.pyqref b { color: var(--acc); }
.pyqgroup summary { cursor: pointer; display: flex; flex-wrap: wrap; gap: 8px; align-items: baseline; }
.pyqgroup > .btn { margin-top: 12px; }
.pyqhead { display: flex; flex-wrap: wrap; gap: 8px; align-items: baseline; }
.pyqcount { margin-left: auto; font-size: .8rem; color: var(--mute); }
.pyqcount.full { color: var(--ok); font-weight: 600; }
.rev li .btn { margin-top: 6px; min-height: 34px; padding: 4px 12px; }

#toast {
  position: fixed; left: 50%; bottom: 20px; transform: translate(-50%, 20px); opacity: 0;
  background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 10px;
  pointer-events: none; transition: .2s; max-width: calc(100% - 32px);
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 520px) {
  .tabs { gap: 0; padding: 8px 4px; justify-content: space-between; }
  .tabs a { padding: 6px 5px; font-size: .78rem; }
  .big { font-size: 2.1rem; }
  .card { padding: 14px; }
  .tm { display: none; }
}