:root {
  --bg: #f7f4ff;
  --card: #ffffff;
  --ink: #1f1b3a;
  --muted: #6b6788;
  --line: #e4defa;
  --brand: #5b3df5;
  --brand-ink: #ffffff;
  --accent: #ff6b57;
  --good: #1f9d6b;
  --good-bg: #dff6ec;
  --bad: #d63a3a;
  --bad-bg: #fde4e4;
  --radius: 18px;
  --shadow: 0 6px 20px rgba(60, 40, 160, 0.10);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14112b;
    --card: #1e1a3d;
    --ink: #f1eeff;
    --muted: #a49fc8;
    --line: #342e63;
    --brand: #8a74ff;
    --brand-ink: #14112b;
    --accent: #ff8a78;
    --good: #4cd6a0;
    --good-bg: #123b2d;
    --bad: #ff7a7a;
    --bad-bg: #431d26;
    --shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.45;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.top {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px; max-width: 760px; width: 100%; margin: 0 auto;
}
.logo { font-weight: 800; font-size: 24px; letter-spacing: -0.5px; color: var(--brand); text-decoration: none; }
main { flex: 1; width: 100%; max-width: 760px; margin: 0 auto; padding: 8px 16px 32px; }
.foot { text-align: center; color: var(--muted); font-size: 14px; padding: 16px; }
h1 { font-size: 28px; line-height: 1.15; margin: 8px 0 6px; letter-spacing: -0.5px; }
h2 { font-size: 20px; margin: 22px 0 10px; }
p { margin: 6px 0 12px; }
.muted { color: var(--muted); }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow); margin: 12px 0;
}
.grid { display: grid; gap: 12px; }
.grid.two { grid-template-columns: 1fr 1fr; }
@media (max-width: 420px) { .grid.two { grid-template-columns: 1fr; } }

.btn, .pill {
  font: inherit; font-weight: 700; cursor: pointer; border: 0; text-decoration: none;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; border-radius: 999px; padding: 12px 26px;
  background: var(--brand); color: var(--brand-ink);
  transition: transform .08s ease, filter .15s ease;
}
.btn:active, .pill:active { transform: scale(0.97); }
.btn:hover, .pill:hover { filter: brightness(1.08); }
.btn.block { width: 100%; }
.btn.alt { background: transparent; color: var(--brand); border: 2px solid var(--brand); }
.btn.soft, .pill.ghost { background: var(--card); color: var(--ink); border: 1px solid var(--line); }
.btn.good { background: var(--good); color: #fff; }
.btn.bad { background: var(--bad); color: #fff; }
.pill { min-height: 38px; padding: 8px 18px; font-size: 15px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.setcard { display: block; text-decoration: none; color: inherit; }
.setcard h3 { margin: 0 0 4px; font-size: 19px; }
.setcard .meta { color: var(--muted); font-size: 14px; }
.chip { display: inline-block; background: var(--line); color: var(--ink); font-size: 13px; font-weight: 700; border-radius: 999px; padding: 4px 12px; margin: 2px 6px 2px 0; }

.mode { text-align: left; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; color: var(--ink); font: inherit; cursor: pointer; text-decoration: none; display: block; box-shadow: var(--shadow); }
.mode:hover { border-color: var(--brand); }
.mode .ico { font-size: 28px; display: block; margin-bottom: 4px; }
.mode b { display: block; font-size: 18px; }
.mode span.d { color: var(--muted); font-size: 14px; }

.bar { height: 10px; border-radius: 999px; background: var(--line); overflow: hidden; margin: 6px 0 14px; }
.bar > i { display: block; height: 100%; background: var(--brand); width: 0; transition: width .25s ease; }
.hud { display: flex; justify-content: space-between; color: var(--muted); font-size: 15px; font-weight: 600; }

.flash { perspective: 900px; margin: 14px 0; }
.flash-inner {
  position: relative; min-height: 240px; border-radius: 24px; cursor: pointer;
  transform-style: preserve-3d; transition: transform .45s ease;
}
.flash-inner.flipped { transform: rotateY(180deg); }
.face {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center;
  padding: 24px; border-radius: 24px; border: 1px solid var(--line); background: var(--card); box-shadow: var(--shadow);
}
.face.back { transform: rotateY(180deg); background: var(--brand); color: var(--brand-ink); border-color: var(--brand); }
.face .big { font-size: 26px; font-weight: 800; line-height: 1.2; }
.face .def { font-size: 20px; font-weight: 600; }
.face .hint { position: absolute; bottom: 12px; font-size: 13px; opacity: .7; }

.q { font-size: 21px; font-weight: 700; margin: 6px 0 14px; line-height: 1.3; }
.opts { display: grid; gap: 10px; }
.opt {
  font: inherit; text-align: left; cursor: pointer; padding: 14px 16px; min-height: 52px;
  background: var(--card); color: var(--ink); border: 2px solid var(--line); border-radius: 14px;
}
.opt:hover:not(:disabled) { border-color: var(--brand); }
.opt.right { background: var(--good-bg); border-color: var(--good); }
.opt.wrong { background: var(--bad-bg); border-color: var(--bad); }
.opt:disabled { cursor: default; }
input[type=text] {
  font: inherit; width: 100%; padding: 14px 16px; min-height: 52px; border-radius: 14px;
  border: 2px solid var(--line); background: var(--card); color: var(--ink);
}
input[type=text]:focus { border-color: var(--brand); outline: none; }
.fb { margin: 12px 0; padding: 12px 14px; border-radius: 12px; font-weight: 600; }
.fb.ok { background: var(--good-bg); color: var(--good); }
.fb.no { background: var(--bad-bg); color: var(--bad); }
.fb .ans { color: var(--ink); font-weight: 700; }

.match { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.tile {
  font: inherit; font-size: 15px; text-align: left; cursor: pointer; padding: 12px; min-height: 64px;
  background: var(--card); color: var(--ink); border: 2px solid var(--line); border-radius: 14px;
}
.tile.term { font-weight: 800; }
.tile.sel { border-color: var(--brand); box-shadow: 0 0 0 3px var(--line); }
.tile.done { background: var(--good-bg); border-color: var(--good); color: var(--good); cursor: default; }
.tile.shake { animation: shake .3s; border-color: var(--bad); background: var(--bad-bg); }
@keyframes shake { 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }

.score-big { font-size: 56px; font-weight: 900; color: var(--brand); line-height: 1; margin: 8px 0; }
.stats { display: flex; gap: 18px; flex-wrap: wrap; color: var(--muted); font-weight: 600; margin-bottom: 8px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }

table.board { width: 100%; border-collapse: collapse; font-size: 15px; }
.board th { text-align: left; color: var(--muted); font-size: 13px; padding: 6px 4px; }
.board td { padding: 10px 4px; border-top: 1px solid var(--line); }
.board td.n { width: 34px; font-weight: 800; color: var(--muted); }
.board td.sc { font-weight: 800; text-align: right; }
.board .when { color: var(--muted); font-size: 13px; }
.board tr.me td { background: var(--good-bg); }
.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0 12px; }
.tabs .pill { background: var(--card); color: var(--ink); border: 1px solid var(--line); }
.tabs .pill.on { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); }
.crumb { display: inline-block; margin: 4px 0; color: var(--brand); font-weight: 700; text-decoration: none; }
.toast { color: var(--muted); font-size: 14px; margin-top: 8px; }
.empty { text-align: center; color: var(--muted); padding: 18px 8px; }
dialog { border: 0; border-radius: var(--radius); padding: 22px; background: var(--card); color: var(--ink); max-width: 420px; width: calc(100% - 32px); box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(20, 17, 43, .55); }
.err { color: var(--bad); font-weight: 600; min-height: 22px; }
label { font-weight: 700; display: block; margin: 8px 0 6px; }