:root,
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f2f2f7;
  --surface: #ffffff;
  --label: #1c1c1e;
  --secondary: #3a3a3c;
  --tertiary: #636366;
  --separator: rgba(60, 60, 67, 0.18);
  --fill: rgba(120, 120, 128, 0.16);
  --pressed: rgba(60, 60, 67, 0.1);
  --accent: #0071e3;
  --button: #0071e3;
  --button-text: #ffffff;
  --bar: rgba(242, 242, 247, 0.82);
  --segment: #ffffff;
  --segment-shadow: 0 1px 3px rgba(0, 0, 0, 0.16), 0 0.5px 0 rgba(0, 0, 0, 0.08);
  --good: #1d7a34;
  --good-bg: rgba(29, 122, 52, 0.12);
  --bad: #c41a16;
  --bad-bg: rgba(196, 26, 22, 0.1);
  --card-shadow: 0 10px 28px rgba(0, 0, 0, 0.06);
  --card-border: 0.5px solid rgba(0, 0, 0, 0.04);
  --sheet: rgba(255, 255, 255, 0.94);
  --tab: #636366;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #000000;
    --surface: #1c1c1e;
    --label: #f2f2f7;
    --secondary: #c7c7cc;
    --tertiary: #8e8e93;
    --separator: rgba(84, 84, 88, 0.65);
    --fill: rgba(120, 120, 128, 0.32);
    --pressed: rgba(255, 255, 255, 0.08);
    --accent: #0a84ff;
    --button: #0071e3;
    --button-text: #ffffff;
    --bar: rgba(28, 28, 30, 0.82);
    --segment: #636366;
    --segment-shadow: none;
    --good: #30d158;
    --good-bg: rgba(48, 209, 88, 0.16);
    --bad: #ff6961;
    --bad-bg: rgba(255, 105, 97, 0.16);
    --card-shadow: none;
    --card-border: 0.5px solid rgba(255, 255, 255, 0.08);
    --sheet: rgba(44, 44, 46, 0.94);
    --tab: #8e8e93;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #000000;
  --surface: #1c1c1e;
  --label: #f2f2f7;
  --secondary: #c7c7cc;
  --tertiary: #8e8e93;
  --separator: rgba(84, 84, 88, 0.65);
  --fill: rgba(120, 120, 128, 0.32);
  --pressed: rgba(255, 255, 255, 0.08);
  --accent: #0a84ff;
  --button: #0071e3;
  --button-text: #ffffff;
  --bar: rgba(28, 28, 30, 0.82);
  --segment: #636366;
  --segment-shadow: none;
  --good: #30d158;
  --good-bg: rgba(48, 209, 88, 0.16);
  --bad: #ff6961;
  --bad-bg: rgba(255, 105, 97, 0.16);
  --card-shadow: none;
  --card-border: 0.5px solid rgba(255, 255, 255, 0.08);
  --sheet: rgba(44, 44, 46, 0.94);
  --tab: #8e8e93;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--label);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Segoe UI", Inter, "Noto Sans", sans-serif;
  font-size: 17px;
  line-height: 1.35;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }

body, button, a {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.app {
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}

main {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.pane {
  width: min(520px, 100%);
  margin: 0 auto;
  padding-bottom: 12px;
}

.toolbar {
  position: sticky;
  top: 0;
  z-index: 5;
  min-height: calc(44px + env(safe-area-inset-top));
  padding-top: env(safe-area-inset-top);
  background: var(--bg);
}

.toolbar:not(.is-pushed) {
  min-height: env(safe-area-inset-top);
  height: env(safe-area-inset-top);
  padding-top: 0;
  background: transparent;
  pointer-events: none;
}

.toolbar.is-compact:not(.is-pushed) {
  height: auto;
  min-height: calc(44px + env(safe-area-inset-top));
  padding-top: env(safe-area-inset-top);
  margin-bottom: -44px;
  pointer-events: none;
}

.toolbar.is-compact,
.toolbar.is-pushed {
  background: var(--bar);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  box-shadow: inset 0 -0.5px 0 var(--separator);
}

.back {
  position: absolute;
  left: max(4px, env(safe-area-inset-left));
  top: env(safe-area-inset-top);
  height: 44px;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0 8px;
  color: var(--accent);
  font-size: 17px;
  background: none;
  border: 0;
}

.back svg { display: block; }

.inline-title {
  position: absolute;
  left: 84px;
  right: 84px;
  top: env(safe-area-inset-top);
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
  opacity: 0;
  pointer-events: none;
}

.inline-title span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toolbar.is-compact .inline-title,
.toolbar.is-pushed .inline-title { opacity: 1; }

.hero { padding: 4px 20px 14px; }

.hero-top {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
}

.hero h1 {
  margin: 0;
  font-size: 34px;
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.022em;
}

.hero p {
  margin: 4px 0 0;
  color: var(--secondary);
  font-size: 15px;
}

.pill {
  flex: none;
  min-height: 28px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--fill);
  color: var(--label);
  font-size: 13px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.group-label {
  margin: 18px 32px 7px;
  font-size: 13px;
  font-weight: 400;
  color: var(--secondary);
}

.hero + .group-label { margin-top: 2px; }

.group {
  margin: 0 16px 8px;
  background: var(--surface);
  border-radius: 12px;
  overflow: hidden;
}

.group.pad { padding: 8px; }

.row {
  --sep: 16px;
  width: 100%;
  min-height: 52px;
  padding: 8px 14px 8px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  border: 0;
  background-color: transparent;
  background-image: none;
  text-align: left;
  color: inherit;
}

.group .row + .row {
  background-image: linear-gradient(var(--separator), var(--separator));
  background-repeat: no-repeat;
  background-position: var(--sep) 0;
  background-size: calc(100% - var(--sep)) 0.5px;
}

.row.has-mark { --sep: 64px; }

.row.static { cursor: default; }

.row-main { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 1px; }
.row-title { font-size: 17px; font-weight: 400; }
.row-sub { font-size: 13px; color: var(--secondary); }
.row-meta, .row-es {
  color: var(--secondary);
  font-size: 15px;
  font-variant-numeric: tabular-nums;
}
.row-side { display: flex; align-items: center; gap: 6px; max-width: 46%; }
.row-es { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tick { color: var(--accent); font-weight: 700; }

.mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--fill);
  display: grid;
  place-items: center;
  font-size: 16px;
  font-weight: 600;
  flex: none;
}

.chev {
  width: 8px;
  height: 8px;
  border-right: 1.5px solid var(--tertiary);
  border-bottom: 1.5px solid var(--tertiary);
  transform: rotate(-45deg);
  flex: none;
  margin-right: 2px;
}

.continue {
  margin: 4px 16px 12px;
  padding: 16px;
  background: var(--surface);
  border-radius: 16px;
}

.kicker-row { display: flex; justify-content: space-between; gap: 8px; }
.eyebrow {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--secondary);
}
.continue .word {
  margin: 12px 0 0;
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
}
.continue .tr { margin: 2px 0 12px; color: var(--secondary); font-size: 15px; }
.continue .btn { width: 100%; margin-top: 12px; }

.bar {
  height: 4px;
  border-radius: 99px;
  background: var(--fill);
  overflow: hidden;
}
.bar > span {
  display: block;
  height: 100%;
  background: var(--accent);
  border-radius: inherit;
}

.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin: 0 16px 18px;
  background: var(--separator);
  border-radius: 12px;
  overflow: hidden;
}
.stat { background: var(--surface); padding: 12px 14px 13px; min-height: 74px; }
.stat b {
  display: block;
  font-size: 22px;
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.stat span { display: block; margin-top: 2px; color: var(--secondary); font-size: 13px; }

.inset { margin: 0 16px 12px; }

.segmented {
  display: flex;
  gap: 2px;
  padding: 2px;
  background: var(--fill);
  border-radius: 9px;
}
.segmented button {
  flex: 1 0 auto;
  min-width: 0;
  min-height: 32px;
  padding: 0 8px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--label);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.segmented.tight { overflow-x: auto; }
.segmented.tight button { flex: 1; font-size: 12px; padding: 0 4px; }
.segmented button[aria-checked="true"] {
  background: var(--segment);
  box-shadow: var(--segment-shadow);
}

.letters {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  padding: 0 16px 8px;
}
.letter {
  min-height: 76px;
  border: 0;
  border-radius: 12px;
  background: var(--surface);
  color: var(--label);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 8px 2px;
}
.letter .ru { line-height: 1; }
.letter .ru b { font-size: 28px; font-weight: 600; letter-spacing: -0.04em; }
.letter .ru span { font-size: 16px; font-weight: 500; color: var(--secondary); margin-left: 1px; }
.letter .ph { font-size: 11px; font-weight: 600; color: var(--tertiary); }
.letter.is-seen { box-shadow: inset 0 0 0 1.5px var(--accent); }

.giant {
  margin: 12px 20px 0;
  font-size: 96px;
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 0.95;
}
.giant .lower {
  font-size: 56px;
  color: var(--secondary);
  margin-left: 6px;
  letter-spacing: -0.04em;
}
.alias { margin: 8px 20px 14px; color: var(--secondary); font-size: 17px; }
.copy { padding: 12px 16px; font-size: 17px; }
.copy .tr { color: var(--secondary); font-size: 15px; margin-top: 2px; }

.help { margin: 8px 16px 16px; }
.help summary {
  min-height: 44px;
  padding: 12px 16px;
  font-weight: 600;
  list-style: none;
  cursor: pointer;
}
.help summary::-webkit-details-marker { display: none; }
.help p { margin: 0; padding: 0 16px 14px; color: var(--secondary); font-size: 15px; }

.card-tools {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 0 20px 8px;
  min-height: 32px;
}
.card-tools p { margin: 0; color: var(--secondary); font-size: 13px; font-variant-numeric: tabular-nums; }
.linkish {
  border: 0;
  background: none;
  color: var(--accent);
  min-height: 44px;
  padding: 0 2px;
  font-size: 15px;
}
.linkish:disabled { color: var(--tertiary); }

.flip { margin: 4px 16px 0; perspective: 1200px; }
.flip-inner {
  position: relative;
  min-height: 300px;
  transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(0.32, 0.72, 0, 1);
  border-radius: 18px;
}
.flip-inner.is-flipped { transform: rotateY(180deg); }
.face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  padding: 22px 20px 16px;
  border-radius: 18px;
  background: var(--surface);
  border: var(--card-border);
  box-shadow: var(--card-shadow);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow: auto;
}
.face-back { transform: rotateY(180deg); pointer-events: none; }
.flip-inner.is-flipped .face-back { pointer-events: auto; }
.flip-inner.is-flipped .face-front { pointer-events: none; }
.kicker {
  margin: 0;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--tertiary);
}
.word {
  margin: 14px 0 0;
  font-size: 34px;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
  text-wrap: balance;
}
.face .tr { margin: 8px 0 0; color: var(--secondary); font-size: 17px; }
.face .note { margin: 12px 0 0; color: var(--secondary); font-size: 15px; }
.hint {
  margin-top: auto;
  padding-top: 16px;
  color: var(--tertiary);
  font-size: 13px;
}
.known-flag {
  align-self: flex-start;
  margin-top: 12px;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--good-bg);
  color: var(--good);
  font-size: 12px;
  font-weight: 600;
}

.listen {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: calc(100% - 32px);
  margin: 8px 16px 0;
  min-height: 44px;
  border: 0;
  background: none;
  color: var(--accent);
  font-size: 17px;
  font-weight: 600;
}
.listen:disabled { color: var(--tertiary); }
.listen svg { width: 18px; height: 18px; }
.speech-note {
  min-height: 18px;
  margin: 0 24px 8px;
  text-align: center;
  color: var(--secondary);
  font-size: 13px;
}

.pair { display: flex; gap: 10px; margin: 8px 16px 16px; }
.pair .btn { flex: 1; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 12px 16px;
  border-radius: 12px;
  border: 0;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.btn-fill { background: var(--button); color: var(--button-text); }
.btn-gray { background: var(--fill); color: var(--label); }
.btn-plain { background: transparent; color: var(--accent); }

.quiz-card, .finished {
  margin: 8px 16px 12px;
  padding: 18px 16px 16px;
  background: var(--surface);
  border-radius: 16px;
}
.prompt {
  margin: 8px 0 0;
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
}
.quiz-card .listen { width: auto; margin: 8px 0 0; padding: 0; }
.quiz-card .group { margin: 14px 0 0; }
.field {
  width: 100%;
  min-height: 48px;
  margin-top: 14px;
  padding: 12px 14px;
  border: 0;
  border-radius: 12px;
  background: var(--fill);
  font-size: 17px;
}
.field-hint { margin: 8px 0 0; color: var(--secondary); font-size: 13px; }
.option {
  width: 100%;
  min-height: 52px;
  padding: 12px 16px;
  border: 0;
  background: transparent;
  text-align: left;
  font-size: 17px;
  line-height: 1.3;
}
.option:disabled { opacity: 1; }
.option.is-correct { background: var(--good-bg); color: var(--good); }
.option.is-wrong { background: var(--bad-bg); color: var(--bad); }
.feedback {
  margin: 12px 16px;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--surface);
}
.feedback strong { display: block; font-size: 17px; }
.feedback.is-good strong { color: var(--good); }
.feedback.is-bad strong { color: var(--bad); }
.feedback p { margin: 4px 0 0; color: var(--secondary); font-size: 15px; }

.score {
  margin: 8px 0 0;
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.score span { font-size: 28px; color: var(--secondary); font-weight: 600; }
.result-copy { margin: 10px 0 0; font-size: 17px; }
.finished h2, .quiz-card h2 {
  margin: 6px 0 0;
  font-size: 28px;
  letter-spacing: -0.02em;
}
.stack { display: flex; flex-direction: column; gap: 8px; margin-top: 16px; }

#dock {
  flex: none;
  background: var(--bar);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  box-shadow: inset 0 0.5px 0 var(--separator);
  padding-bottom: env(safe-area-inset-bottom);
}
#dock[hidden] { display: none; }
.app:has(#dock[hidden]) main {
  padding-bottom: env(safe-area-inset-bottom);
}
.tabs, .dock-actions {
  width: min(520px, 100%);
  margin: 0 auto;
}
.tabs { display: flex; min-height: 49px; }
.tab {
  flex: 1;
  min-width: 0;
  min-height: 49px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1px;
  color: var(--tab);
  font-size: 10px;
  font-weight: 500;
}
.tab svg { width: 24px; height: 24px; }
.tab[aria-current="page"] { color: var(--accent); font-weight: 600; }
.dock-actions { display: flex; gap: 10px; padding: 8px 16px; }
.dock-actions .btn { flex: 1; }
.dock-three { gap: 8px; padding-left: 12px; padding-right: 12px; }
.dock-three .btn { font-size: 15px; padding-left: 6px; padding-right: 6px; min-height: 44px; }

a.continue { display: block; color: inherit; }

.star {
  flex: none;
  width: 44px;
  height: 44px;
  border: 0;
  background: transparent;
  color: var(--tertiary);
  font-size: 22px;
  line-height: 1;
}
.star.is-on { color: var(--accent); }

.keys { margin: 4px 10px 16px; user-select: none; }
.key-row { display: flex; gap: 4px; margin-bottom: 4px; }
.key {
  flex: 1;
  min-width: 0;
  min-height: 44px;
  border: 0;
  border-radius: 6px;
  background: var(--surface);
  color: var(--label);
  font-size: 17px;
  padding: 0 1px;
}
.key-wide { font-size: 14px; }
#latin-preview:empty::before { content: '…'; color: var(--tertiary); }

.sheet-root {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: center;
  background: rgba(0, 0, 0, 0.4);
}
.sheet-root[hidden] { display: none; }
.sheet {
  width: min(520px, calc(100% - 16px));
  margin-bottom: calc(8px + env(safe-area-inset-bottom));
}
.sheet-card, .sheet-cancel {
  background: var(--sheet);
  border-radius: 14px;
  overflow: hidden;
  backdrop-filter: saturate(180%) blur(24px);
  -webkit-backdrop-filter: saturate(180%) blur(24px);
}
.sheet-cancel { margin-top: 8px; width: 100%; }
.sheet-copy {
  margin: 0;
  padding: 14px 16px 10px;
  text-align: center;
  color: var(--secondary);
  font-size: 13px;
}
.sheet-copy strong {
  display: block;
  margin-bottom: 4px;
  color: var(--label);
  font-size: 13px;
  font-weight: 600;
}
.sheet-btn {
  width: 100%;
  min-height: 56px;
  border: 0;
  background: transparent;
  font-size: 17px;
  color: var(--accent);
}
.sheet-btn.danger {
  color: var(--bad);
  box-shadow: inset 0 0.5px 0 var(--separator);
}
.sheet-btn.cancel { font-weight: 600; }

.danger-row { color: var(--bad); justify-content: center; }
.about { padding: 12px 16px 14px; color: var(--secondary); font-size: 15px; }
.about p { margin: 0 0 8px; }
.about p:last-child { margin: 0; }

.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;
}

.word, .tr, .note, .row-title, .row-sub, .row-es, .copy, .prompt { user-select: text; -webkit-user-select: text; }
.toolbar, .tabs, .btn, .letter, .tab { user-select: none; }

:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (hover: hover) {
  .row:hover { background-color: var(--pressed); }
  .letter:hover { background-color: var(--pressed); }
}

.row:active, .letter:active, .option:active { background-color: var(--pressed); }
.btn:active { transform: scale(0.985); }
.option.is-correct:active { background-color: var(--good-bg); }
.option.is-wrong:active { background-color: var(--bad-bg); }

@media (min-width: 480px) {
  .letters { grid-template-columns: repeat(5, 1fr); }
}

@media (max-height: 700px) {
  .flip-inner { min-height: 230px; }
  .giant { font-size: 76px; }
  .word, .prompt, .continue .word { font-size: 28px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}