@import url("https://fonts.googleapis.com/css2?family=Roboto+Flex:opsz,wght@8..144,400..900&family=Roboto+Mono:wght@400;500;700&display=swap");

:root {
  color-scheme: light;
  --bp-ink: #1d2138;
  --bp-ink-soft: #64708f;
  --bp-ink-faint: #a5aec4;
  --bp-indigo: #3020a8;
  --bp-indigo-soft: #eeebff;
  --bp-indigo-hover: #251681;
  --bp-green: #16a34a;
  --bp-green-soft: #ecfdf3;
  --bp-green-rule: #86efac;
  --bp-gold: #f59e0b;
  --bp-gold-soft: #fff7dd;
  --bp-paper: #ffffff;
  --bp-paper-soft: #f8faff;
  --bp-canvas: #f3f6ff;
  --bp-rule: #dbe3f5;
  --bp-rule-strong: #c8d3ee;
  --bp-wrong: #dc2626;
  --bp-wrong-soft: #fff1f2;
  --bp-mark: #fff1a8;
  --bp-radius-sm: 9px;
  --bp-radius-md: 14px;
  --bp-radius-lg: 22px;
  --bp-shadow-soft: 0 20px 60px -34px rgba(79, 70, 229, 0.45);
  --bp-mono: "Roboto Mono";
  --bp-display: "Roboto Flex";
}

* {
  box-sizing: border-box;
}

img,
button {
  max-width: 100%;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bp-canvas);
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  overscroll-behavior-x: none;
  overscroll-behavior-y: auto;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  overflow-y: auto;
  color: var(--bp-ink);
  font-family: var(--bp-display);
  font-size: 16px;
  line-height: 1.4;
}

button {
  font: inherit;
  color: inherit;
}

.btn {
  min-height: 38px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--bp-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 15px;
  transition: transform 100ms ease, background 140ms ease, border-color 140ms ease, color 140ms ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--bp-indigo);
  color: var(--bp-paper);
  border-color: var(--bp-indigo);
}

.btn-primary:hover {
  background: var(--bp-indigo-hover);
  border-color: var(--bp-indigo-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--bp-indigo);
  border-color: var(--bp-indigo);
}

.btn-secondary:hover {
  background: var(--bp-indigo-soft);
}

.btn-tertiary {
  background: transparent;
  color: var(--bp-ink-soft);
  border-color: transparent;
}

.btn-tertiary:hover {
  color: var(--bp-indigo);
  background: var(--bp-indigo-soft);
}

.icon-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.icon {
  width: 1.35em;
  height: 1.35em;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.25;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.bp-app {
  height: 100%;
  display: flex;
  flex-direction: column;
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  background: linear-gradient(180deg, #ffffff 0%, var(--bp-paper-soft) 100%);
}

.bp-app.slide-next .bp-card,
.bp-app.slide-next .bp-study-dock {
  animation: slideNext 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.bp-app.slide-prev .bp-card,
.bp-app.slide-prev .bp-study-dock {
  animation: slidePrev 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.bp-app.swipe-active .bp-card,
.bp-app.swipe-active .bp-study-dock {
  transform: translateX(var(--swipe-x, 0));
}

.bp-app.swipe-dragging .bp-card,
.bp-app.swipe-dragging .bp-study-dock {
  transition: none;
}

.bp-app.swipe-release .bp-card,
.bp-app.swipe-release .bp-study-dock {
  transition: transform 160ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes slideNext {
  from {
    opacity: 0.35;
    transform: translateX(34px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slidePrev {
  from {
    opacity: 0.35;
    transform: translateX(-34px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .bp-app.slide-next .bp-card,
  .bp-app.slide-next .bp-study-dock,
  .bp-app.slide-prev .bp-card,
  .bp-app.slide-prev .bp-study-dock {
    animation: none;
  }
}

.bp-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px 12px;
  border-bottom: 1px solid var(--bp-rule);
  font-family: var(--bp-mono);
  font-size: 11px;
  letter-spacing: 0.01em;
}

.bp-top .brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  text-transform: uppercase;
}

.bp-top .brand .flag {
  width: 21px;
  height: 15px;
  background: linear-gradient(to bottom, #000 33%, #d00 33% 66%, #ffce00 66%);
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: 3px;
  display: inline-block;
}

.bp-top-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.bp-top-actions .icon {
  width: 20px;
  height: 20px;
}

.bp-filter-toggle,
.bp-shuffle-toggle,
.bp-language {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 31px;
  height: 29px;
  border: 1px solid var(--bp-rule-strong);
  background: var(--bp-paper);
  border-radius: var(--bp-radius-md);
  cursor: pointer;
  position: relative;
  padding: 0;
}

.bp-language {
  width: auto;
  min-width: 58px;
  padding: 0 8px;
}

.bp-language select {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--bp-ink);
  font-family: var(--bp-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.01em;
  cursor: pointer;
  outline: 0;
}

.bp-language:focus-within {
  outline: 2px solid var(--bp-indigo);
  outline-offset: 2px;
}

.bp-filter-toggle {
  width: 36px;
  max-width: 36px;
  padding: 0;
  font-family: var(--bp-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  line-height: 1;
  overflow: hidden;
}

.bp-filter-toggle span {
  overflow: hidden;
}

.bp-shuffle-toggle {
  display: inline-grid;
  place-items: center;
  font-family: var(--bp-mono);
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
}

.bp-shuffle-toggle[aria-pressed="true"] {
  background: var(--bp-indigo);
  color: var(--bp-paper);
  border-color: var(--bp-indigo);
}

.bp-filter-toggle[aria-expanded="true"] {
  background: var(--bp-indigo);
  color: var(--bp-paper);
  border-color: var(--bp-indigo);
}

.bp-mode {
  display: inline-flex;
  border: 1px solid var(--bp-rule-strong);
  border-radius: var(--bp-radius-md);
  padding: 2px;
  background: var(--bp-indigo-soft);
}

.bp-mode button {
  background: transparent;
  border: 0;
  padding: 5px 11px;
  border-radius: calc(var(--bp-radius-md) - 3px);
  font-family: inherit;
  font-size: inherit;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--bp-ink);
  cursor: pointer;
  font-weight: 700;
  transition: background 120ms ease, color 120ms ease;
}

.bp-mode button:not([aria-pressed="true"]):hover {
  background: rgba(79, 70, 229, 0.1);
}

.bp-mode button[aria-pressed="true"] {
  background: var(--bp-indigo);
  color: var(--bp-paper);
}

.bp-mode button:focus-visible,
.bp-filter-toggle:focus-visible,
.bp-shuffle-toggle:focus-visible,
.cat-pill:focus-visible,
.bp-answer:focus-visible,
.panel-tabs button:focus-visible,
.known-item button:focus-visible,
.result-actions button:focus-visible,
.bp-nav button:focus-visible {
  outline: 2px solid var(--bp-indigo);
  outline-offset: 2px;
}

.bp-pills-bar {
  display: none;
  padding: 10px 12px 12px;
  border-bottom: 1px solid var(--bp-rule);
  background: rgba(255, 255, 255, 0.96);
}

.bp-app.filters-open .bp-pills-bar {
  display: block;
}

.panel-tabs {
  display: flex;
  gap: 18px;
  padding: 0;
  margin: 0 0 14px;
  border: 0;
  border-bottom: 1px solid var(--bp-rule);
  border-radius: 0;
  background: transparent;
}

.panel-tabs button {
  position: relative;
  border: 0;
  border-radius: 0;
  background: transparent;
  min-height: 34px;
  padding: 0 0 10px;
  font-family: var(--bp-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  cursor: pointer;
  color: var(--bp-ink-soft);
}

.panel-tabs button[aria-pressed="true"] {
  background: transparent;
  color: var(--bp-ink);
}

.panel-tabs button[aria-pressed="true"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  border-radius: 999px 999px 0 0;
  background: var(--bp-indigo);
}

.panel-pane {
  min-height: 0;
}

.bp-pills-bar .pills {
  display: flex;
  gap: 6px;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 1px 0;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.bp-pills-bar .pills::-webkit-scrollbar {
  display: none;
}

.cat-pill {
  flex-shrink: 0;
  padding: 4px 10px 5px;
  border: 1px solid var(--bp-rule);
  background: var(--bp-paper);
  border-radius: var(--bp-radius-md);
  cursor: pointer;
  white-space: nowrap;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.05;
  gap: 1px;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}

.cat-pill .de {
  font-family: var(--bp-mono);
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  color: var(--bp-ink);
}

.cat-pill .en {
  font-family: var(--bp-mono);
  font-size: 9px;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  color: var(--bp-ink-soft);
}

.cat-pill:hover {
  border-color: var(--bp-indigo);
}

.cat-pill[aria-pressed="true"] {
  background: var(--bp-indigo);
  border-color: var(--bp-indigo);
}

.cat-pill[aria-pressed="true"] .de {
  color: var(--bp-paper);
}

.cat-pill[aria-pressed="true"] .en {
  color: var(--bp-paper);
  opacity: 0.65;
}

.known-summary {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 9px;
  font-family: var(--bp-mono);
  font-size: 10.5px;
  font-weight: 700;
  color: var(--bp-ink-soft);
  text-transform: uppercase;
}

.known-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 42dvh;
  overflow-y: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.known-list::-webkit-scrollbar {
  display: none;
}

.known-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 32px;
  align-items: center;
  gap: 8px;
  padding: 9px 8px 9px 10px;
  border: 1px solid var(--bp-rule);
  border-radius: var(--bp-radius-md);
  background: var(--bp-paper);
}

.known-item p {
  margin: 3px 0 0;
  font-size: 12.5px;
  line-height: 1.25;
  font-weight: 700;
  color: var(--bp-ink);
}

.known-meta,
.known-empty {
  font-family: var(--bp-mono);
  font-size: 9.5px;
  line-height: 1.2;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--bp-ink-soft);
}

.known-empty {
  padding: 16px 4px;
  text-align: center;
}

.known-item button {
  width: 32px;
  height: 32px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--bp-rule);
  border-radius: var(--bp-radius-sm);
  background: var(--bp-paper-soft);
  color: var(--bp-wrong);
  cursor: pointer;
}

.test-config {
  padding: 4px 0;
}

.test-config label {
  display: block;
  margin-bottom: 10px;
  font-family: var(--bp-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--bp-ink-soft);
}

.test-size-control {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) 38px;
  align-items: center;
  border: 1px solid var(--bp-rule-strong);
  border-radius: var(--bp-radius-md);
  background: var(--bp-paper);
  overflow: hidden;
}

.test-size-control button,
.test-size-control input {
  height: 42px;
  border: 0;
  background: transparent;
}

.test-size-control button {
  display: inline-grid;
  place-items: center;
  color: var(--bp-indigo);
  cursor: pointer;
}

.test-size-control button:disabled {
  color: var(--bp-ink-faint);
  cursor: default;
}

.test-size-control input {
  width: 100%;
  border-left: 1px solid var(--bp-rule);
  border-right: 1px solid var(--bp-rule);
  text-align: center;
  font-family: var(--bp-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--bp-ink);
  appearance: textfield;
}

.test-size-control input::-webkit-outer-spin-button,
.test-size-control input::-webkit-inner-spin-button {
  appearance: none;
  margin: 0;
}

.test-size-control input:focus {
  outline: 2px solid var(--bp-indigo);
  outline-offset: -2px;
}

.test-size-meta {
  margin-top: 9px;
  font-family: var(--bp-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--bp-ink-soft);
}

.bp-track {
  height: 3px;
  background: #e8edff;
  border-bottom: 1px solid var(--bp-rule);
  position: relative;
}

.bp-track .fill {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: linear-gradient(90deg, var(--bp-indigo), #22c55e);
  transition: width 0.4s ease;
}

.bp-card {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  padding: 18px 18px 10px;
  gap: 14px;
  overflow-x: hidden;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
  touch-action: pan-y;
}

.bp-card::-webkit-scrollbar {
  display: none;
}

.bp-q-label {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-family: var(--bp-mono);
  font-size: 11px;
  color: var(--bp-ink-soft);
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.bp-q-label .tag,
.bp-q-label .known-tag {
  background: var(--bp-ink);
  color: var(--bp-paper);
  padding: 4px 8px;
  font-weight: 700;
  border-radius: var(--bp-radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.bp-q-label .tag {
  background: var(--bp-indigo-soft);
  color: var(--bp-indigo);
}

.bp-q-label .known-tag {
  background: var(--bp-green-soft);
  color: var(--bp-green);
}

.bp-q-label .grow {
  flex: 1;
}

.bp-feedback {
  font-family: var(--bp-mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
  font-size: 11px;
  align-items: center;
  gap: 4px;
}

.bp-feedback:not([hidden]) {
  display: inline-flex;
}

.bp-feedback.correct {
  color: var(--bp-green);
}

.bp-feedback.wrong {
  color: var(--bp-wrong);
}

.bp-known,
.bp-sub .progress {
  color: var(--bp-ink);
  font-weight: 700;
}

.bp-known {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  line-height: 1;
}

.bp-known .check {
  color: var(--bp-green);
  width: 22px;
  height: 22px;
  display: block;
}

.progress {
  display: inline-flex;
  align-items: baseline;
  color: var(--bp-ink);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.pct {
  color: var(--bp-ink-faint);
  margin-left: 2px;
}

.bp-q {
  font-family: var(--bp-display);
  font-size: clamp(20px, 6.4vw, 26px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: 0;
  color: var(--bp-ink);
  margin: 0;
  text-wrap: pretty;
}

.kw {
  background-image: linear-gradient(transparent 58%, var(--bp-mark) 58%);
  padding: 0 0.05em;
}

.bp-q-en {
  font-family: var(--bp-mono);
  font-size: 14px;
  line-height: 1.45;
  color: var(--bp-ink-soft);
  margin: -6px 0 0;
  padding: 0;
  text-align: left;
}

.danger {
  color: var(--bp-wrong);
}

.bp-image {
  display: none;
  width: 100%;
  min-width: 0;
  max-height: 138px;
  object-fit: contain;
  padding: 8px;
  border: 1px solid var(--bp-rule-strong);
  border-radius: var(--bp-radius-md);
  background: var(--bp-paper);
}

.bp-image.visible {
  display: block;
}

.bp-answers {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 0 0 auto;
}

.bp-answer {
  display: grid;
  grid-template-columns: 1fr auto;
  column-gap: 12px;
  align-items: start;
  padding: 11px 12px 11px 10px;
  background: var(--bp-paper);
  color: var(--bp-ink);
  border: 1px solid var(--bp-rule-strong);
  border-radius: var(--bp-radius-md);
  text-align: left;
  width: 100%;
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease, opacity 160ms ease, transform 100ms ease, box-shadow 160ms ease;
}

.bp-answer:active:not(:disabled) {
  transform: scale(0.995);
}

.bp-answer:not(:disabled):hover {
  background: var(--bp-indigo-soft);
  border-color: var(--bp-indigo);
}

.bp-answer:disabled {
  cursor: default;
}

.bp-answer .text {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0;
}

.bp-answer .text .en {
  display: block;
  font-family: var(--bp-display);
  font-style: normal;
  font-size: 13px;
  color: var(--bp-ink-soft);
  font-weight: 400;
  margin-top: 3px;
  letter-spacing: 0;
}

.bp-answer .mark {
  font-family: var(--bp-mono);
  font-size: 14px;
  font-weight: 700;
  color: transparent;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  display: inline-grid;
  place-items: center;
  align-self: center;
}

.bp-answer.is-correct {
  background: var(--bp-green-soft);
  color: var(--bp-ink);
  border-color: var(--bp-green-rule);
}

.bp-answer.is-correct .kw {
  background-image: linear-gradient(transparent 60%, rgba(255, 244, 163, 0.58) 60%);
  background-color: transparent;
  color: var(--bp-ink);
  padding: 0 0.05em;
}

.bp-answer.is-correct .text .en {
  color: #397653;
}

.bp-answer.is-correct .mark {
  color: var(--bp-green);
  background: transparent;
}

.bp-answer.is-correct .mark .icon {
  width: 28px;
  height: 28px;
  stroke-width: 2.35;
}

.bp-answer.is-wrong {
  background: var(--bp-wrong-soft);
  border-color: var(--bp-wrong);
  color: var(--bp-wrong);
}

.bp-answer.is-wrong .kw {
  background-image: none;
  background-color: rgba(168, 40, 31, 0.12);
  padding: 1px 4px;
  border-radius: 5px;
}

.bp-answer.is-wrong .text .en {
  color: var(--bp-wrong);
  opacity: 0.7;
}

.bp-answer.is-wrong .mark {
  color: var(--bp-paper);
  background: var(--bp-wrong);
}

.bp-answer.is-wrong .mark .icon {
  width: 18px;
  height: 18px;
  stroke-width: 2.7;
}

.bp-answer.is-dim {
  opacity: 0.52;
}

.bp-hint {
  font-family: var(--bp-display);
  font-style: normal;
  font-size: 15px;
  line-height: 1.45;
  color: var(--bp-ink-soft);
  margin: 0;
  text-wrap: pretty;
}

.bp-hint .hint-icon {
  width: 18px;
  height: 18px;
  color: var(--bp-ink-soft);
  margin-right: 5px;
  vertical-align: -3px;
}

.bp-hint .kw {
  font-weight: 600;
}

.bp-locked {
  font-family: var(--bp-mono);
  font-size: 11px;
  color: var(--bp-ink-faint);
  letter-spacing: 0.02em;
  text-align: center;
  padding: 4px 0;
}

.bp-study-dock {
  flex: 0 0 auto;
  border-top: 1px solid var(--bp-rule);
  background: rgba(255, 255, 255, 0.82);
  padding: 10px 0 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 34dvh;
  overflow-x: hidden;
  overflow-y: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  touch-action: pan-y;
}

.bp-study-dock::-webkit-scrollbar {
  display: none;
}

.bp-study-dock .bp-hint {
  padding: 0 18px;
}

.bp-kw-list {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding: 1px 18px;
  margin: 0;
}

.bp-kw-list::-webkit-scrollbar {
  display: none;
}

.bp-kw-list .kw-item {
  flex-shrink: 0;
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
  padding: 7px 11px 8px;
  border: 1px solid var(--bp-rule-strong);
  border-radius: var(--bp-radius-md);
  background: var(--bp-paper);
  white-space: nowrap;
  font-family: var(--bp-mono);
  line-height: 1.1;
}

.bp-kw-list .kw-item .de {
  font-family: var(--bp-display);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0;
}

.bp-kw-list .kw-item .en {
  font-size: 12px;
  color: var(--bp-ink-soft);
}

.bp-kw-list .kw-item .en::before {
  content: "";
}

.bp-nav {
  display: grid;
  grid-template-columns: 1fr 1.35fr 1fr;
  border-top: 1px solid var(--bp-rule);
  background: rgba(255, 255, 255, 0.92);
}

.bp-nav button {
  appearance: none;
  background: transparent;
  border: 0;
  border-right: 1px solid var(--bp-rule);
  padding: 14px 6px calc(14px + env(safe-area-inset-bottom));
  font-family: var(--bp-mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--bp-ink);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: background 120ms ease, color 120ms ease;
}

.bp-nav button:not(:disabled):hover {
  background: var(--bp-indigo-soft);
}

.bp-nav button:last-child {
  border-right: 0;
  background: var(--bp-indigo);
  color: var(--bp-paper);
}

.bp-nav button:last-child:not(:disabled):hover {
  background: var(--bp-indigo-hover);
}

.bp-nav button:disabled {
  color: var(--bp-ink-faint);
  cursor: default;
}

.bp-nav button:last-child:disabled {
  background: var(--bp-paper-soft);
  color: var(--bp-ink-faint);
}

.bp-nav .known-btn.on {
  background: var(--bp-green-soft);
  color: var(--bp-green);
}

.bp-nav .arrow {
  display: inline-block;
}

.bp-empty {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
  color: var(--bp-ink-soft);
  font-family: var(--bp-mono);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.bp-empty .big {
  font-family: var(--bp-display);
  font-size: 24px;
  font-weight: 900;
  color: var(--bp-ink);
  margin-bottom: 8px;
  letter-spacing: 0;
}

.bp-result {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: 22px 18px 14px;
  background:
    radial-gradient(circle at 18% 10%, rgba(245, 158, 11, 0.18), transparent 30%),
    linear-gradient(180deg, #ffffff 0%, var(--bp-paper-soft) 100%);
}

.bp-result.passed {
  background:
    linear-gradient(90deg, transparent 0 8%, rgba(245, 158, 11, 0.18) 8% 9%, transparent 9% 22%, rgba(22, 163, 74, 0.16) 22% 23%, transparent 23% 100%),
    radial-gradient(circle at 18% 9%, rgba(245, 158, 11, 0.2), transparent 28%),
    linear-gradient(180deg, #ffffff 0%, var(--bp-green-soft) 100%);
}

.result-hero {
  text-align: center;
  padding: 12px 0 18px;
}

.result-icon {
  width: 58px;
  height: 58px;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  background: var(--bp-gold-soft);
  color: var(--bp-gold);
  margin-bottom: 10px;
}

.bp-result.passed .result-icon {
  background: var(--bp-green-soft);
  color: var(--bp-green);
  animation: popResult 420ms cubic-bezier(0.2, 0.9, 0.2, 1.2);
}

@keyframes popResult {
  0% {
    transform: scale(0.74) rotate(-10deg);
  }
  100% {
    transform: scale(1) rotate(0);
  }
}

.result-icon .icon {
  width: 34px;
  height: 34px;
}

.result-kicker {
  margin: 0 0 2px;
  font-family: var(--bp-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--bp-ink-soft);
}

.result-hero h1 {
  margin: 0;
  font-size: 58px;
  line-height: 0.95;
  letter-spacing: 0;
  font-weight: 900;
}

.result-hero p:last-child {
  margin: 8px 0 0;
  color: var(--bp-ink-soft);
  font-family: var(--bp-mono);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.result-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin: -2px 0 20px;
}

.result-actions button {
  background-color: var(--bp-paper);
}

.missed-review h2 {
  margin: 0 0 9px;
  font-size: 16px;
  line-height: 1.1;
  letter-spacing: 0;
}

.missed-item {
  border: 1px solid var(--bp-rule);
  border-radius: var(--bp-radius-md);
  background: rgba(255, 255, 255, 0.88);
  padding: 12px;
  margin-bottom: 9px;
}

.missed-item > span {
  display: block;
  margin-bottom: 5px;
  font-family: var(--bp-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--bp-ink-soft);
}

.missed-item h3 {
  margin: 0 0 9px;
  font-size: 15px;
  line-height: 1.2;
  letter-spacing: 0;
}

.result-note {
  margin: 5px 0 0;
  font-size: 13.5px;
  line-height: 1.25;
}

.missed-q-en {
  margin: -4px 0 10px;
  font-family: var(--bp-mono);
  font-size: 12.5px;
  line-height: 1.35;
  color: var(--bp-ink-soft);
}

.missed-answer {
  margin: 7px 0 0;
  display: grid;
  grid-template-columns: 17px minmax(0, 1fr);
  gap: 7px;
  align-items: start;
  font-size: 13.5px;
  line-height: 1.25;
}

.missed-answer .de {
  display: block;
  font-weight: 700;
}

.missed-answer .en {
  display: block;
  margin-top: 2px;
  font-family: var(--bp-mono);
  font-size: 12px;
  font-weight: 400;
  opacity: 0.72;
}

.missed-answer.wrong {
  color: var(--bp-wrong);
}

.missed-answer.right {
  color: var(--bp-green);
}

.missed-answer .icon {
  width: 17px;
  height: 17px;
  margin-top: 1px;
}

.result-note {
  color: var(--bp-ink-soft);
}

.bp-q-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 2px 0 -2px;
}

.bp-q-chips:empty,
.bp-q-chips[hidden] {
  display: none;
}

.bp-chip {
  appearance: none;
  border: 1px solid var(--bp-rule-strong);
  background: var(--bp-paper);
  color: var(--bp-ink-soft);
  border-radius: 999px;
  padding: 4px 10px 4px 8px;
  font-family: var(--bp-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  line-height: 1;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
}

.bp-chip .icon {
  width: 14px;
  height: 14px;
}

.bp-chip.duplicate-chip {
  cursor: default;
  background: var(--bp-gold-soft);
  border-color: #e7c97a;
  color: #8a6a17;
}

.bp-answer .text .why {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 6px;
  margin-top: 6px;
  padding-top: 1px;
  font-family: var(--bp-display);
  font-size: 12px;
  font-weight: 400;
  font-style: normal;
  line-height: 1.3;
  color: var(--bp-ink-soft);
  letter-spacing: 0;
}

.bp-answer .text .why-icon {
  width: 13px;
  height: 13px;
  margin-top: 1px;
  color: var(--bp-ink-faint);
  stroke-width: 2.25;
}

.bp-answer.is-correct .text .why {
  color: #397653;
  font-style: normal;
}

.bp-answer.is-correct .text .why-icon {
  color: var(--bp-green);
}

.bp-answer.is-wrong .text .why {
  color: var(--bp-wrong);
  opacity: 0.85;
}

.missed-item .variant-note {
  margin: 7px 0 0;
  padding: 6px 9px;
  background: var(--bp-gold-soft);
  border: 1px solid #e7c97a;
  border-radius: var(--bp-radius-sm);
  font-family: var(--bp-mono);
  font-size: 11.5px;
  line-height: 1.35;
  color: #8a6a17;
}

[hidden] {
  display: none !important;
}

@media (max-width: 719px) {
  .bp-app.filters-open::before {
    content: "";
    position: fixed;
    inset: 0;
    background: rgba(29, 33, 56, 0.22);
    z-index: 8;
    pointer-events: none;
  }

  .bp-app.filters-open .bp-pills-bar {
    position: fixed;
    top: calc(10px + env(safe-area-inset-top));
    left: 10px;
    bottom: calc(10px + env(safe-area-inset-bottom));
    z-index: 40;
    display: flex;
    flex-direction: column;
    width: min(360px, calc(100vw - 38px));
    border: 1px solid var(--bp-rule-strong);
    border-radius: var(--bp-radius-lg);
    background: var(--bp-paper);
    box-shadow: 0 26px 80px -42px rgba(29, 33, 56, 0.7);
    overflow: hidden;
  }

  .bp-app.filters-open .panel-pane {
    min-height: 0;
    overflow: hidden;
  }

  .bp-app.filters-open .bp-pills-bar .pills,
  .bp-app.filters-open .known-list {
    max-height: none;
    height: 100%;
    overflow-y: auto;
  }
}

@media (min-width: 720px) {
  body {
    background: var(--bp-canvas);
    font-size: 17px;
  }

  .bp-app {
    max-width: 720px;
    margin: 0 auto;
    height: 100dvh;
    background: var(--bp-paper);
    border-left: 1px solid var(--bp-rule);
    border-right: 1px solid var(--bp-rule);
    box-shadow: var(--bp-shadow-soft);
    display: grid;
    grid-template-columns: minmax(0, 720px);
    grid-template-rows: auto 3px minmax(0, 1fr) auto auto;
  }

  .bp-app.filters-open {
    max-width: 960px;
    grid-template-columns: 240px minmax(0, 720px);
  }

  .bp-top {
    grid-column: 1 / -1;
    padding: 18px 24px 16px;
    font-size: 12px;
  }

  .bp-pills-bar {
    display: none;
    grid-column: 1;
    grid-row: 2 / -1;
    min-height: 0;
    padding: 16px 12px;
    border-right: 1px solid var(--bp-rule);
    border-bottom: 0;
    overflow: hidden;
  }

  .bp-app.filters-open .bp-pills-bar {
    display: block;
  }

  .bp-pills-bar .pills {
    height: auto;
    max-height: calc(100dvh - 140px);
    flex-direction: column;
    overflow-x: hidden;
    overflow-y: auto;
    gap: 8px;
  }

  .panel-tabs {
    margin-bottom: 12px;
  }

  .known-list {
    max-height: calc(100dvh - 170px);
  }

  .cat-pill {
    width: 100%;
    white-space: normal;
    padding: 7px 10px 8px;
    text-align: left;
  }

  .cat-pill .de {
    font-size: 10px;
    line-height: 1.15;
    text-align: left;
  }

  .bp-track {
    grid-column: 1;
    grid-row: 2;
  }

  .bp-card {
    grid-column: 1;
    grid-row: 3;
    padding: 24px 24px 14px;
    gap: 18px;
  }

  .bp-q {
    font-size: clamp(28px, 4vw, 34px);
  }

  .bp-q-en {
    font-size: 13.5px;
  }

  .bp-image {
    max-height: 180px;
  }

  .bp-answer {
    padding: 14px 14px 14px 12px;
  }

  .bp-answer .text {
    font-size: 16px;
  }

  .bp-nav button {
    padding: 16px 8px calc(16px + env(safe-area-inset-bottom));
    font-size: 12px;
  }

  .bp-empty,
  .bp-result,
  .bp-study-dock,
  .bp-nav {
    grid-column: 1;
  }

  .bp-app.filters-open .bp-track,
  .bp-app.filters-open .bp-card,
  .bp-app.filters-open .bp-empty,
  .bp-app.filters-open .bp-result,
  .bp-app.filters-open .bp-study-dock,
  .bp-app.filters-open .bp-nav {
    grid-column: 2;
  }

  .bp-empty {
    grid-row: 3;
  }

  .bp-result {
    grid-row: 3 / 5;
    padding: 28px 28px 18px;
  }

  .bp-study-dock {
    grid-row: 4;
  }

  .bp-nav {
    grid-row: 5;
  }

  .bp-app.fit-tight .bp-card {
    padding-top: 18px;
    padding-bottom: 10px;
    gap: 12px;
  }

  .bp-app.fit-tight .bp-q {
    font-size: clamp(24px, 3vw, 30px);
    line-height: 1.04;
  }

  .bp-app.fit-tight .bp-q-en {
    font-size: 12px;
    line-height: 1.25;
  }

  .bp-app.fit-tight .bp-image {
    max-height: 132px;
    padding: 5px;
  }

  .bp-app.fit-tight .bp-answers {
    gap: 6px;
  }

  .bp-app.fit-tight .bp-answer {
    padding: 9px 10px;
  }

  .bp-app.fit-tight .bp-answer .text {
    font-size: 14px;
    line-height: 1.16;
  }

  .bp-app.fit-tight .bp-answer .text .en {
    font-size: 11px;
    line-height: 1.14;
  }

  .bp-app.fit-tight .bp-study-dock {
    padding-top: 7px;
    padding-bottom: 6px;
    gap: 6px;
    max-height: 30dvh;
  }

  .bp-app.fit-tight .bp-hint {
    font-size: 12.5px;
    line-height: 1.25;
  }

  .bp-app.fit-tight .bp-kw-list .kw-item {
    padding: 5px 8px 6px;
  }

  .bp-app.fit-tight .bp-kw-list .kw-item .de {
    font-size: 12.5px;
  }

  .bp-app.fit-tight .bp-kw-list .kw-item .en {
    font-size: 10.5px;
  }

  .bp-app.fit-tighter .bp-top {
    padding-top: 12px;
    padding-bottom: 10px;
  }

  .bp-app.fit-tighter .bp-card {
    padding-top: 12px;
    padding-bottom: 6px;
    gap: 8px;
  }

  .bp-app.fit-tighter .bp-q-label {
    font-size: 9.5px;
  }

  .bp-app.fit-tighter .bp-q {
    font-size: clamp(20px, 2.55vw, 25px);
  }

  .bp-app.fit-tighter .bp-q-en {
    font-size: 10.5px;
    line-height: 1.18;
  }

  .bp-app.fit-tighter .bp-image {
    max-height: 100px;
    padding: 4px;
  }

  .bp-app.fit-tighter .bp-answer {
    padding: 6px 8px;
  }

  .bp-app.fit-tighter .bp-answer .text {
    font-size: 12.5px;
  }

  .bp-app.fit-tighter .bp-answer .text .en {
    font-size: 9.8px;
  }

  .bp-app.fit-tighter .bp-hint {
    font-size: 11.5px;
    line-height: 1.16;
  }

  .bp-app.fit-tighter .bp-study-dock {
    padding-top: 5px;
    padding-bottom: 5px;
    gap: 5px;
    max-height: 26dvh;
  }

  .bp-app.fit-tighter .bp-nav button {
    padding-top: 10px;
    padding-bottom: calc(10px + env(safe-area-inset-bottom));
  }
}

@media (max-width: 719px) {
  body {
    overflow-x: hidden;
    overflow-y: auto;
  }

  .bp-app {
    height: 100dvh;
    min-height: 0;
  }

  .bp-app.filters-open::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 20;
    background: rgba(29, 33, 56, 0.08);
    pointer-events: none;
  }

  .bp-top {
    padding: 10px 18px;
  }

  .bp-shuffle-toggle {
    display: inline-grid;
  }

  .bp-mode button {
    padding: 4px 9px;
  }

  .bp-pills-bar {
    display: block;
    position: fixed;
    z-index: 30;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(310px, calc(100vw - 42px));
    padding: calc(18px + env(safe-area-inset-top)) 14px calc(18px + env(safe-area-inset-bottom));
    border: 0;
    border-right: 1px solid var(--bp-rule);
    background: var(--bp-paper);
    box-shadow: 14px 0 42px -34px rgba(29, 33, 56, 0.45);
    transform: translateX(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 180ms ease, opacity 180ms ease;
  }

  .bp-app.filters-open .bp-pills-bar {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
  }

  .bp-pills-bar .pills {
    height: 100%;
    flex-direction: column;
    gap: 8px;
    overflow-x: hidden;
    overflow-y: auto;
    padding: 0;
  }

  .cat-pill {
    width: 100%;
    padding: 9px 11px 10px;
    white-space: normal;
  }

  .cat-pill .de {
    font-size: 10.5px;
    line-height: 1.15;
  }

  .cat-pill .en {
    font-size: 9.5px;
  }

  .bp-card {
    flex: 1 1 auto;
    min-height: 0;
    overflow-x: hidden;
    overflow-y: hidden;
    padding: 18px 18px 12px;
    gap: 14px;
  }

  .bp-q-label {
    font-size: 11px;
    gap: 6px;
  }

  .bp-q {
    font-size: clamp(22px, 6.5vw, 28px);
  }

  .bp-q-en {
    margin-top: -2px;
    font-size: 13.5px;
    line-height: 1.4;
  }

  .bp-image {
    max-height: 118px;
    padding: 6px;
  }

  .bp-answers {
    gap: 9px;
  }

  .bp-answer {
    min-height: 0;
    padding: 10px 10px;
  }

  .bp-answer .text {
    font-size: 15px;
    line-height: 1.22;
  }

  .bp-answer .text .en {
    font-size: 12.5px;
    margin-top: 2px;
  }

  .bp-hint {
    font-size: 14.5px;
    line-height: 1.4;
  }

  .bp-study-dock {
    padding: 9px 0 7px;
    gap: 8px;
    max-height: 36dvh;
    overflow-y: hidden;
  }

  .bp-kw-list .kw-item {
    padding: 6px 9px 7px;
  }

  .bp-kw-list .kw-item .de {
    font-size: 13.5px;
  }

  .bp-kw-list .kw-item .en {
    font-size: 11.5px;
  }

  .bp-nav button {
    padding-top: 13px;
    padding-bottom: calc(13px + env(safe-area-inset-bottom));
    font-size: 11px;
  }

  .bp-app.fit-tight .bp-card {
    padding-top: 14px;
    padding-bottom: 8px;
    gap: 10px;
  }

  .bp-app.fit-tight .bp-q {
    font-size: clamp(20px, 5.8vw, 25px);
    line-height: 1.04;
  }

  .bp-app.fit-tight .bp-q-en {
    font-size: 12px;
    line-height: 1.28;
  }

  .bp-app.fit-tight .bp-answers {
    gap: 6px;
  }

  .bp-app.fit-tight .bp-answer {
    padding: 8px 9px;
  }

  .bp-app.fit-tight .bp-answer .text {
    font-size: 14px;
    line-height: 1.16;
  }

  .bp-app.fit-tight .bp-answer .text .en {
    font-size: 11px;
    line-height: 1.14;
  }

  .bp-app.fit-tight .bp-study-dock {
    padding-top: 7px;
    padding-bottom: 6px;
    gap: 6px;
  }

  .bp-app.fit-tight .bp-hint {
    font-size: 12.5px;
    line-height: 1.25;
  }

  .bp-app.fit-tight .bp-kw-list .kw-item {
    padding: 5px 8px 6px;
  }

  .bp-app.fit-tight .bp-kw-list .kw-item .de {
    font-size: 12.5px;
  }

  .bp-app.fit-tight .bp-kw-list .kw-item .en {
    font-size: 10.5px;
  }

  .bp-app.fit-tighter .bp-top {
    padding-top: 8px;
    padding-bottom: 8px;
  }

  .bp-app.fit-tighter .bp-card {
    padding-top: 10px;
    padding-bottom: 6px;
    gap: 8px;
  }

  .bp-app.fit-tighter .bp-q-label {
    font-size: 9.5px;
  }

  .bp-app.fit-tighter .bp-q {
    font-size: clamp(18px, 5.2vw, 23px);
  }

  .bp-app.fit-tighter .bp-q-en {
    font-size: 11px;
    line-height: 1.2;
  }

  .bp-app.fit-tighter .bp-image {
    max-height: 92px;
    padding: 4px;
  }

  .bp-app.fit-tighter .bp-answer {
    padding: 6px 8px;
  }

  .bp-app.fit-tighter .bp-answer .text {
    font-size: 13px;
  }

  .bp-app.fit-tighter .bp-answer .text .en {
    font-size: 10px;
  }

  .bp-app.fit-tighter .bp-hint {
    font-size: 11.5px;
    line-height: 1.18;
  }

  .bp-app.fit-tighter .bp-study-dock {
    padding-top: 5px;
    padding-bottom: 5px;
    gap: 5px;
  }

  .bp-app.fit-tighter .bp-nav button {
    padding-top: 10px;
    padding-bottom: calc(10px + env(safe-area-inset-bottom));
  }
}

@media (min-width: 1100px) {
  .bp-app {
    border-radius: 0 0 var(--bp-radius-lg) var(--bp-radius-lg);
    overflow: hidden;
  }
}