/* Quiz & Flashcards (js/tools/quiz.js) — every class prefixed q- */
.q-root {
  --q-good-ink: color-mix(in srgb, var(--good) 62%, var(--text));
  --q-bad-ink: color-mix(in srgb, var(--bad) 70%, var(--text));
  --q-warn-ink: color-mix(in srgb, var(--warn) 62%, var(--text));
}
.q-root [hidden] { display: none !important; }
.q-root .badge.good { color: var(--q-good-ink); }
.q-root .badge.warn { color: var(--q-warn-ink); }
.q-root .tool-head h1 svg { width: 26px; height: 26px; color: var(--accent); flex: none; }

/* ---------- start screen ---------- */
.q-fieldset { border: 0; margin: 0; padding: 0; min-width: 0; display: flex; flex-direction: column; gap: 16px; }
.q-fieldset:disabled { opacity: .65; }
.q-fieldset:disabled button { cursor: not-allowed; }
.q-seg { display: flex; width: 100%; }
.q-seg button { flex: 1; display: inline-flex; align-items: center; justify-content: center; gap: 7px; padding: 8px 10px; min-height: 38px; }
.q-seg button:hover:not(.on):not(:disabled) { color: var(--text); }
.q-seg svg { width: 16px; height: 16px; flex: none; }
.q-mode button { font-size: 14.5px; min-height: 42px; }
.q-notes-meta { display: flex; justify-content: space-between; gap: 4px 12px; flex-wrap: wrap; }
.q-notes-meta .q-over { color: var(--q-warn-ink); font-weight: 600; }
.q-go { display: flex; flex-direction: column; gap: 12px; margin-top: 18px; }
.q-go-btn { padding: 12px 18px; font-size: 15.5px; }
.q-fine { margin: 0; text-align: center; }
.q-note-acts { margin-top: 10px; }

.q-work { display: flex; flex-direction: column; gap: 10px; padding: 12px 14px; border-radius: 12px; background: var(--panel-2); border: 1px solid var(--line); }
.q-work-top { display: flex; align-items: center; justify-content: space-between; gap: 8px 10px; flex-wrap: wrap; }
.q-work-top .working { min-width: 0; }
.q-work .hint { min-height: 1em; }

.q-sets-card h2 { display: flex; align-items: center; gap: 8px; }
.q-sets { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.q-set { display: flex; align-items: center; gap: 4px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel-2); transition: border-color .15s; }
.q-set:hover { border-color: var(--line-2); }
.q-set .btn { margin-right: 6px; flex: none; }
.q-set-open { flex: 1; min-width: 0; display: flex; align-items: center; gap: 12px; padding: 10px 12px; border: 0; background: none; color: inherit; text-align: left; border-radius: 12px; }
.q-set-open:hover .q-set-title { color: var(--accent); }
.q-set-icon { flex: none; width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center; }
.q-set-icon svg { width: 20px; height: 20px; }
.q-is-quiz { background: color-mix(in srgb, var(--accent) 18%, transparent); color: var(--accent); }
.q-is-cards { background: color-mix(in srgb, var(--accent-2) 18%, transparent); color: var(--accent-2); }
.q-set-body { min-width: 0; display: flex; flex-direction: column; gap: 3px; }
.q-set-title { font-weight: 650; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; transition: color .15s; }
.q-set-meta { display: flex; align-items: center; gap: 4px 8px; flex-wrap: wrap; font-size: 12.5px; color: var(--faint); }
.q-locked .q-set-open { opacity: .55; pointer-events: none; }
.q-empty { padding: 20px 10px 8px; }
.q-empty p { margin: 0; }
.q-examples { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; margin-top: 14px; }

/* ---------- shared player bits ---------- */
.q-stage { max-width: 720px; margin: 0 auto; animation: q-in .25s ease; }
@keyframes q-in { from { opacity: 0; transform: translateY(6px); } }
.q-top { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; min-width: 0; }
.q-back-btn { flex: none; margin-left: -8px; }
.q-back-btn svg, .q-prev svg { transform: scaleX(-1); }
.q-top-title { flex: 1; min-width: 0; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.q-top .badge { flex: none; }
.q-count { display: flex; justify-content: space-between; align-items: center; gap: 6px 12px; flex-wrap: wrap; margin-bottom: 8px; font-size: 13.5px; font-weight: 600; color: var(--muted); }
.q-score { display: inline-flex; align-items: center; gap: 5px; color: var(--q-good-ink); }
.q-score svg { width: 15px; height: 15px; }
.q-center { text-align: center; margin: 10px 0 0; }

/* ---------- quiz ---------- */
.q-play .q-qtext { font-size: 20px; line-height: 1.4; margin: 18px 0 0; overflow-wrap: anywhere; }
.q-play .q-qtext:focus { outline: none; }
.q-choices { display: grid; gap: 10px; margin-top: 16px; }
.q-choice {
  display: flex; align-items: center; gap: 12px; width: 100%; min-height: 50px;
  padding: 11px 14px; border-radius: 12px; border: 1px solid var(--line-2);
  background: var(--panel-2); color: var(--text); text-align: left; font-size: 15px; line-height: 1.45;
  transition: border-color .15s, background .15s, opacity .15s, transform .08s;
}
.q-choice:hover:not(:disabled) { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, var(--panel-2)); }
.q-choice:active:not(:disabled) { transform: translateY(1px); }
.q-choice:disabled { cursor: default; }
.q-key { flex: none; display: grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: var(--panel-3); color: var(--muted); font-weight: 700; font-size: 13px; transition: background .15s, color .15s; }
.q-choice-text { flex: 1; min-width: 0; overflow-wrap: anywhere; }
.q-mark { flex: none; display: inline-flex; }
.q-mark svg { width: 20px; height: 20px; }
.q-choice.q-right { border-color: var(--good); background: color-mix(in srgb, var(--good) 14%, var(--panel-2)); }
.q-choice.q-right .q-key { background: var(--good); color: #06291a; }
.q-choice.q-right .q-mark { color: var(--q-good-ink); }
.q-choice.q-wrong { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 12%, var(--panel-2)); animation: q-shake .35s; }
.q-choice.q-wrong .q-key { background: var(--bad); color: #fff; }
.q-choice.q-wrong .q-mark { color: var(--q-bad-ink); }
.q-choice.q-dim { opacity: .5; }
@keyframes q-shake { 25% { transform: translateX(-4px); } 75% { transform: translateX(4px); } }

.q-after { margin-top: 16px; display: flex; flex-direction: column; gap: 12px; }
.q-after:empty { display: none; }
.q-feedback { display: flex; align-items: flex-start; gap: 10px; padding: 12px 14px; border-radius: 12px; font-size: 15px; animation: q-in .2s ease; }
.q-feedback svg { width: 20px; height: 20px; flex: none; margin-top: 2px; }
.q-feedback.q-good { background: color-mix(in srgb, var(--good) 13%, transparent); border: 1px solid color-mix(in srgb, var(--good) 45%, transparent); }
.q-feedback.q-good svg { color: var(--q-good-ink); }
.q-feedback.q-bad { background: color-mix(in srgb, var(--bad) 10%, transparent); border: 1px solid color-mix(in srgb, var(--bad) 45%, transparent); }
.q-feedback.q-bad svg { color: var(--q-bad-ink); }
.q-explain { font-size: 14.5px; color: var(--muted); }
.q-keys { text-align: center; margin: 12px 0 0; }

/* ---------- results ---------- */
.q-result-head { display: flex; align-items: center; gap: 22px; }
.q-ring {
  --p: 0; flex: none; width: 128px; height: 128px; border-radius: 50%; display: grid; place-items: center;
  background: conic-gradient(var(--accent-2), var(--accent) calc(var(--p) * 1%), var(--panel-3) 0);
}
.q-ring-in { width: 104px; height: 104px; border-radius: 50%; background: var(--panel); display: grid; place-items: center; }
.q-ring b { font-size: 36px; font-weight: 800; letter-spacing: -.03em; line-height: 1; }
.q-ring small { font-size: 16px; font-weight: 600; color: var(--muted); margin-left: 2px; }
.q-result-text { min-width: 0; }
.q-result .q-result-text h2 { font-size: 22px; margin: 0 0 4px; }
.q-result-text h2:focus { outline: none; }
.q-result-text p { margin: 0; }
.q-result-text .q-best { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 6px; font-size: 14px; color: var(--muted); }
.q-acts { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }

.q-missed, .q-review { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.q-missed li, .q-review li { border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; background: var(--panel-2); display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.q-m-q { font-weight: 600; overflow-wrap: anywhere; }
.q-ans { display: flex; align-items: flex-start; gap: 8px; font-size: 14px; overflow-wrap: anywhere; }
.q-ans svg { width: 16px; height: 16px; flex: none; margin-top: 3px; }
.q-yours { color: var(--q-bad-ink); }
.q-correct { color: var(--q-good-ink); }
.q-missed .q-explain { font-size: 13.5px; }
.q-review b { overflow-wrap: anywhere; }
.q-review span { color: var(--muted); font-size: 14px; white-space: pre-line; overflow-wrap: anywhere; }

/* ---------- flashcards ---------- */
.q-tally { display: inline-flex; gap: 6px; flex-wrap: wrap; }
.q-card {
  display: block; width: 100%; margin-top: 16px; padding: 0; border: 0; background: none;
  color: inherit; text-align: center; perspective: 1400px; border-radius: 20px;
}
.q-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.q-card-inner { display: grid; transform-style: preserve-3d; -webkit-transform-style: preserve-3d; transition: transform .55s cubic-bezier(.2, .7, .2, 1); }
.q-card.q-flipped .q-card-inner { transform: rotateY(180deg); }
.q-face {
  grid-area: 1 / 1; position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px;
  min-height: 260px; padding: 40px 24px 28px; border-radius: 20px; border: 1px solid var(--line-2); box-shadow: var(--shadow);
  backface-visibility: hidden; -webkit-backface-visibility: hidden; transition: border-color .15s;
}
.q-front { background: radial-gradient(120% 90% at 50% 0%, color-mix(in srgb, var(--accent) 16%, var(--panel)) 0%, var(--panel) 70%); }
.q-back {
  transform: rotateY(180deg);
  background: radial-gradient(120% 90% at 50% 0%, color-mix(in srgb, var(--accent-2) 16%, var(--panel)) 0%, var(--panel) 70%);
  border-color: color-mix(in srgb, var(--accent-2) 40%, var(--line-2));
}
.q-card:hover .q-face { border-color: var(--accent); }
.q-face-tag { position: absolute; top: 14px; left: 16px; font-size: 11.5px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--faint); }
.q-face-text { font-size: 24px; font-weight: 700; line-height: 1.35; letter-spacing: -.01em; overflow-wrap: anywhere; max-width: 560px; }
.q-back-main { font-size: 19px; font-weight: 600; line-height: 1.45; overflow-wrap: anywhere; max-width: 560px; }
.q-back-more { font-size: 15px; color: var(--muted); line-height: 1.5; overflow-wrap: anywhere; max-width: 560px; }
.q-deck-nav { display: grid; grid-template-columns: 1fr auto 1fr; gap: 10px; margin-top: 16px; }
.q-marks { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 10px; }
.q-marks .btn { padding: 11px 14px; }
.q-got { border-color: color-mix(in srgb, var(--good) 50%, var(--line-2)); }
.q-got:hover, .q-got.on { background: color-mix(in srgb, var(--good) 16%, var(--panel-2)); }
.q-got.on { border-color: var(--good); }
.q-got svg { color: var(--q-good-ink); }
.q-again { border-color: color-mix(in srgb, var(--warn) 50%, var(--line-2)); }
.q-again:hover, .q-again.on { background: color-mix(in srgb, var(--warn) 16%, var(--panel-2)); }
.q-again.on { border-color: var(--warn); }
.q-again svg { color: var(--q-warn-ink); }

/* ---------- small screens ---------- */
@media (pointer: coarse) {
  .q-keys { display: none; }
}
@media (max-width: 560px) {
  .q-result-head { flex-direction: column; text-align: center; gap: 14px; }
  .q-best { justify-content: center; }
  .q-acts { flex-direction: column; }
  .q-acts .btn { width: 100%; white-space: normal; }
  .q-play .q-qtext { font-size: 18px; }
  .q-face { min-height: 220px; padding: 38px 16px 24px; }
  .q-face-text { font-size: 20px; }
  .q-back-main { font-size: 17px; }
}
@media (max-width: 400px) {
  .q-hide-sm { display: none; }
  .q-deck-nav .btn { padding: 9px 12px; }
  .q-seg button { padding: 8px 6px; }
}
@media (prefers-reduced-motion: reduce) {
  .q-stage, .q-feedback, .q-choice.q-wrong { animation: none; }
  .q-card-inner, .q-choice, .q-face { transition: none; }
}