:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #667085;
  --line: #d9dee7;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --danger: #b42318;
  --warning: #b54708;
  --ok-bg: #e7f6ee;
  --bad-bg: #fff1f0;
  --shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #101418;
  --panel: #171d24;
  --text: #e7edf4;
  --muted: #9ca9b7;
  --line: #303a46;
  --accent: #2dd4bf;
  --accent-strong: #73eadc;
  --danger: #f87171;
  --warning: #fbbf24;
  --ok-bg: #123229;
  --bad-bg: #351b22;
  --shadow: 0 14px 32px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  min-height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

input,
select,
textarea,
button {
  font: inherit;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  padding: 10px 12px;
}

textarea {
  min-height: 160px;
  resize: vertical;
}

label span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
  padding: 0 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
}

.brand {
  color: var(--accent-strong);
  font-size: 20px;
  font-weight: 800;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font-weight: 600;
}

.theme-toggle {
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  font-size: 13px;
  font-weight: 800;
  padding: 6px 12px;
}

.theme-toggle:hover {
  border-color: var(--accent);
}

.nav-form {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
}

.nav-form span {
  margin: 0;
  color: var(--text);
  font-size: 14px;
}

.nav-form button {
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 700;
  padding: 0;
}

.auth-layout {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(260px, 360px) minmax(260px, 360px);
  gap: 18px;
  align-items: start;
}

.auth-copy {
  padding: 18px 0;
}

.auth-copy h1 {
  margin: 0;
  color: var(--accent-strong);
  font-size: clamp(42px, 7vw, 84px);
  line-height: 1;
}

.auth-copy p {
  max-width: 420px;
  color: var(--muted);
  font-size: 18px;
}

.auth-panel {
  margin: 0;
}

.shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 56px;
}

.page-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 20px;
}

.page-head h1 {
  margin: 0;
  font-size: 30px;
  line-height: 1.15;
}

.page-head p,
.panel p,
.deck-card p,
.result-item p {
  margin: 6px 0 0;
  color: var(--muted);
}

.layout-two {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 18px;
  margin-bottom: 18px;
}

.panel,
.deck-card,
.question,
.result-item,
.empty-state {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.panel {
  padding: 18px;
  margin-bottom: 18px;
}

.panel h2,
.deck-card h2,
.result-item h2 {
  margin: 0 0 14px;
  font-size: 18px;
}

.deck-card h2 a {
  color: var(--accent-strong);
}

.form-stack {
  display: grid;
  gap: 12px;
}

.inline-form {
  display: grid;
  grid-template-columns: minmax(140px, 220px) minmax(220px, 1fr) auto;
  gap: 12px;
  align-items: end;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  align-items: end;
}

.mode-settings-section {
  margin-bottom: 18px;
}

.mode-settings-section h2 {
  margin: 0 0 14px;
  font-size: 18px;
}

.mode-settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
}

.mode-card {
  display: grid;
  align-content: start;
  gap: 14px;
  min-height: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 16px;
}

.mode-card h3 {
  margin: 0;
  font-size: 18px;
}

.mode-card p {
  margin: 5px 0 0;
  color: var(--muted);
}

.mode-controls {
  display: grid;
  gap: 10px;
}

.mode-card .button {
  align-self: end;
  width: 100%;
  margin-top: auto;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  font-weight: 700;
  padding: 9px 14px;
  white-space: nowrap;
}

.button:hover {
  border-color: #a9b4c2;
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.button.primary:hover {
  background: var(--accent-strong);
}

.button:disabled {
  cursor: default;
  opacity: 0.62;
}

.button.danger {
  border-color: #f0b8b4;
  color: var(--danger);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.actions.spaced {
  margin-top: 14px;
}

.deck-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.deck-card {
  display: grid;
  gap: 16px;
  padding: 18px;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 0;
}

.metrics div {
  border-left: 3px solid var(--accent);
  padding-left: 10px;
}

.metrics dt {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.metrics dd {
  margin: 2px 0 0;
  font-size: 22px;
  font-weight: 800;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 820px;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
}

.quiz-form,
.study-form {
  display: grid;
  gap: 16px;
}

.question {
  margin: 0;
  padding: 16px;
}

.question legend {
  padding: 0 6px;
  font-size: 18px;
  font-weight: 800;
}

.option-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.option {
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 10px;
  align-items: start;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  cursor: pointer;
}

.option input {
  width: 18px;
  margin-top: 3px;
}

.option:has(input:checked) {
  border-color: var(--accent);
  background: #eef8f6;
}

.study-progress {
  width: min(760px, 100%);
  height: 8px;
  margin: 0 auto 4px;
  overflow: hidden;
  border-radius: 999px;
  background: #e5e9f0;
}

.study-progress-bar {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 180ms ease;
}

.study-stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: 10px;
  width: min(760px, 100%);
  margin: 0 auto;
}

.study-stat-grid div {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 10px 12px;
}

.study-stat-grid span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.study-stat-grid strong {
  display: block;
  margin-top: 3px;
  font-size: 20px;
  line-height: 1.1;
}

.round-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.round-meta span {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  padding: 5px 10px;
}

.study-deck {
  position: relative;
  width: min(760px, 100%);
  min-height: 580px;
  margin: 0 auto;
  perspective: 1400px;
}

.study-card {
  position: absolute;
  inset: 0;
  display: grid;
  align-content: start;
  gap: 22px;
  width: 100%;
  min-height: 500px;
  margin: 0 auto;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 22px 50px rgba(15, 23, 42, 0.12);
  opacity: 0;
  pointer-events: none;
  touch-action: pan-y;
  transform: translateY(30px) scale(0.94);
  transition:
    transform 200ms ease,
    opacity 200ms ease,
    box-shadow 200ms ease,
    border-color 160ms ease,
    background 160ms ease;
}

.study-card.is-active {
  z-index: 4;
  opacity: var(--drag-opacity, 1);
  pointer-events: auto;
  transform: translateX(var(--drag-x, 0)) rotate(var(--drag-rotate, 0deg));
}

.study-card.is-next {
  z-index: 3;
  opacity: 1;
  transform: translateY(18px) scale(0.975);
}

.study-card.is-after-next {
  z-index: 2;
  opacity: 1;
  transform: translateY(36px) scale(0.95);
}

.study-card.is-hidden-card,
.study-card.is-past {
  z-index: 1;
  opacity: 0;
  transform: translateY(50px) scale(0.92);
}

.study-card.is-dragging {
  cursor: grabbing;
  transition: none;
}

.study-card.is-ready {
  box-shadow: 0 24px 56px rgba(15, 23, 42, 0.14);
}

.study-card.is-swiped-out,
.study-card.is-swiped-right,
.study-card.is-exiting {
  pointer-events: none;
  transform: translateX(115%) rotate(7deg);
  opacity: 0;
  transition: transform 180ms ease, opacity 180ms ease;
}

.study-card.is-swiped-left {
  pointer-events: none;
  transform: translateX(-115%) rotate(-7deg);
  opacity: 0;
  transition: transform 180ms ease, opacity 180ms ease;
}

.study-card.is-reviewed {
  box-shadow: 0 24px 56px rgba(15, 23, 42, 0.14);
}

.study-card.is-correct {
  border-color: #74c69d;
  background: #f3fbf7;
}

.study-card.is-correct::after {
  content: "✓";
  position: absolute;
  top: 22px;
  right: 24px;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 24px;
  font-weight: 900;
}

.study-card.is-wrong {
  border-color: #f0a7a1;
  background: #fff7f6;
}

.study-card legend,
.study-card h2 {
  margin: 0;
  padding: 0;
  font-size: clamp(26px, 4vw, 44px);
  font-weight: 850;
  line-height: 1.12;
  letter-spacing: 0;
}

.card-kicker {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.card-status {
  align-self: end;
  justify-self: end;
  margin-top: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafc;
  color: var(--muted);
  font-weight: 800;
  padding: 8px 12px;
}

.study-card.is-ready .card-status {
  border-color: #c7d0da;
  background: #f2f4f7;
  color: var(--muted);
}

.study-card.is-correct .card-status {
  border-color: #98d7b5;
  background: #e7f6ee;
  color: var(--accent-strong);
}

.study-card.is-wrong .card-status {
  border-color: #f0b8b4;
  background: var(--bad-bg);
  color: var(--danger);
}

.study-card .option-grid {
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 4px;
}

.study-card .option {
  grid-template-columns: 1fr;
  min-height: 58px;
  padding: 15px 16px;
}

.study-card .option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.study-card .option span {
  margin: 0;
  color: var(--text);
  font-size: 17px;
  font-weight: 700;
}

.study-card .option:has(input:checked) {
  border-color: #c7d0da;
  background: #f2f4f7;
  box-shadow: inset 0 0 0 1px #c7d0da;
}

.study-card .option.is-correct-option,
.study-card .option.is-correct-option:has(input:checked) {
  border-color: #74c69d;
  background: #e7f6ee;
  box-shadow: inset 0 0 0 1px #74c69d;
}

.study-card .option.is-wrong-option,
.study-card .option.is-wrong-option:has(input:checked) {
  border-color: #e26d64;
  background: #fff1f0;
  box-shadow: inset 0 0 0 1px #e26d64;
}

.study-card .option:has(input:disabled) {
  cursor: default;
}

.learn-word-line {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 48px;
  gap: 12px;
  align-items: center;
}

.learn-word-line h2 {
  overflow-wrap: anywhere;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--accent-strong);
  cursor: pointer;
  font-weight: 900;
}

.icon-button:hover,
.icon-button.is-speaking {
  border-color: var(--accent);
  background: #edf8f5;
}

.learn-translation {
  margin: 0;
  color: var(--muted);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
}

.learn-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: auto;
}

.learn-actions .button {
  min-height: 54px;
}

.learn-actions .button.is-selected {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.learn-card.is-wrong .learn-actions .button.is-selected {
  border-color: #e26d64;
  background: #fff1f0;
  color: var(--danger);
  box-shadow: inset 0 0 0 1px #e26d64;
}

.learn-card.is-correct .learn-actions .button.is-selected {
  border-color: #74c69d;
  background: #e7f6ee;
  color: var(--accent-strong);
  box-shadow: inset 0 0 0 1px #74c69d;
}

.swipe-confirm {
  align-self: end;
  margin-top: auto;
}

.swipe-track {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 58px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #eef2f6;
  color: var(--muted);
  font-weight: 800;
  user-select: none;
}

.swipe-confirm[data-disabled="false"] .swipe-track {
  border-color: #b7d7d2;
  background: #e8f6f3;
  color: var(--accent-strong);
}

.swipe-handle {
  position: absolute;
  left: 6px;
  width: 46px;
  height: 46px;
  min-height: 46px;
  border: 1px solid #c7d0da;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.12);
  cursor: grab;
  touch-action: none;
  transition: transform 120ms ease, background 120ms ease;
}

.swipe-handle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 12px;
  height: 12px;
  border-top: 3px solid var(--accent);
  border-right: 3px solid var(--accent);
  transform: translate(-65%, -50%) rotate(45deg);
}

.swipe-confirm[data-disabled="true"] .swipe-handle {
  cursor: not-allowed;
  opacity: 0.5;
}

.swipe-confirm.is-dragging .swipe-handle {
  cursor: grabbing;
  transition: none;
}

.swipe-confirm.is-complete .swipe-handle {
  background: var(--accent);
}

.swipe-confirm.is-complete .swipe-handle::after {
  border-color: #fff;
}

.study-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
}

.match-card {
  width: min(940px, 100%);
  min-height: 620px;
}

.match-deck {
  width: min(940px, 100%);
  min-height: 700px;
}

.match-board {
  position: relative;
  display: grid;
  grid-template-columns: minmax(180px, 1fr) minmax(180px, 1fr);
  gap: min(8vw, 96px);
  min-height: 390px;
  padding: 8px 0;
}

.match-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

.match-lines line {
  stroke: var(--accent);
  stroke-width: 3;
  stroke-linecap: round;
}

.match-lines line.is-draft {
  stroke: #94a3b8;
  stroke-dasharray: 6 6;
}

.match-lines line.is-correct {
  stroke: var(--accent);
  stroke-width: 4;
}

.match-lines line.is-wrong {
  stroke: var(--danger);
  stroke-width: 4;
}

.match-column {
  display: grid;
  align-content: start;
  gap: 12px;
  z-index: 1;
}

.match-tile {
  width: 100%;
  min-height: 52px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  cursor: pointer;
  font-weight: 800;
  padding: 12px 14px;
  text-align: left;
  white-space: normal;
}

.match-source {
  border-left: 4px solid var(--accent);
}

.match-target {
  border-right: 4px solid #64748b;
}

.match-tile.is-selected {
  border-color: var(--accent);
  background: #edf8f5;
  box-shadow: inset 0 0 0 1px var(--accent);
}

.match-tile.is-linked {
  background: #f8fafc;
}

.match-tile.is-correct-link {
  border-color: #74c69d;
  background: #e7f6ee;
}

.match-tile.is-wrong-link {
  border-color: #e26d64;
  background: #fff1f0;
}

.match-tile.is-expected-target {
  box-shadow: inset 0 0 0 2px #74c69d;
}

.match-tile:disabled {
  cursor: default;
}

.speed-match {
  display: grid;
  gap: 16px;
}

.speed-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(120px, 1fr));
  gap: 10px;
  width: min(940px, 100%);
  margin: 0 auto;
}

.speed-stats div,
.speed-result {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
  padding: 12px 14px;
}

.speed-stats span,
.speed-result span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.speed-stats strong {
  display: block;
  margin-top: 2px;
  font-size: 24px;
  line-height: 1.1;
}

.speed-result {
  width: min(940px, 100%);
  margin: 0 auto;
  border-color: #b7d7d2;
  background: #e8f6f3;
  color: var(--accent-strong);
}

.speed-result strong {
  display: block;
  font-size: 20px;
}

.speed-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  width: min(940px, 100%);
  margin: 0 auto;
}

.speed-tile {
  display: grid;
  align-content: space-between;
  gap: 10px;
  min-height: 118px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  box-shadow: var(--shadow);
  cursor: pointer;
  padding: 14px;
  text-align: left;
  transition:
    transform 120ms ease,
    opacity 160ms ease,
    border-color 120ms ease,
    background 120ms ease;
}

.speed-tile span {
  color: var(--muted);
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
}

.speed-tile strong {
  font-size: 16px;
  line-height: 1.25;
}

.speed-tile.is-selected {
  border-color: var(--accent);
  background: #edf8f5;
  box-shadow: inset 0 0 0 1px var(--accent), var(--shadow);
}

.speed-tile.is-wrong {
  border-color: #e26d64;
  background: #fff1f0;
  transform: translateY(-2px);
}

.speed-tile.is-matched {
  border-color: #74c69d;
  background: #e7f6ee;
  opacity: 0.42;
  cursor: default;
}

.sticky-actions {
  position: sticky;
  bottom: 0;
  display: flex;
  gap: 10px;
  padding: 14px 0 0;
  background: linear-gradient(to top, var(--bg) 70%, rgba(246, 247, 249, 0));
}

.matching-list {
  display: grid;
  gap: 12px;
}

.match-row {
  display: grid;
  grid-template-columns: minmax(160px, 1fr) minmax(220px, 2fr);
  gap: 12px;
  align-items: center;
}

.match-term {
  font-weight: 800;
}

.result-list {
  display: grid;
  gap: 12px;
}

.result-item {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 16px;
}

.result-item.ok {
  background: var(--ok-bg);
}

.result-item.bad {
  background: var(--bad-bg);
}

.result-item strong {
  color: var(--accent-strong);
}

.result-item.bad strong {
  color: var(--danger);
}

.flash-list {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.flash {
  border-radius: 8px;
  padding: 12px 14px;
  font-weight: 700;
}

.flash-success {
  background: var(--ok-bg);
  color: var(--accent-strong);
}

.flash-error {
  background: var(--bad-bg);
  color: var(--danger);
}

.empty-state {
  padding: 24px;
  color: var(--muted);
}

.empty-state h2 {
  margin: 0 0 6px;
  color: var(--text);
  font-size: 18px;
}

.empty-state .button {
  margin-top: 14px;
}

:root[data-theme="dark"] .topbar {
  background: rgba(16, 20, 24, 0.94);
}

:root[data-theme="dark"] input,
:root[data-theme="dark"] select,
:root[data-theme="dark"] textarea,
:root[data-theme="dark"] .button,
:root[data-theme="dark"] .theme-toggle,
:root[data-theme="dark"] .study-stat-grid div,
:root[data-theme="dark"] .round-meta span,
:root[data-theme="dark"] .card-status,
:root[data-theme="dark"] .icon-button,
:root[data-theme="dark"] .match-tile,
:root[data-theme="dark"] .speed-stats div,
:root[data-theme="dark"] .speed-tile {
  background: #171d24;
  color: var(--text);
}

:root[data-theme="dark"] input,
:root[data-theme="dark"] select,
:root[data-theme="dark"] textarea {
  color-scheme: dark;
}

:root[data-theme="dark"] .button:hover,
:root[data-theme="dark"] .theme-toggle:hover {
  border-color: var(--accent);
}

:root[data-theme="dark"] .button.primary {
  background: #139b8d;
  border-color: #139b8d;
  color: #ffffff;
}

:root[data-theme="dark"] .button.primary:hover {
  background: #0f7f75;
}

:root[data-theme="dark"] .study-progress {
  background: #26313d;
}

:root[data-theme="dark"] .option:has(input:checked),
:root[data-theme="dark"] .study-card .option:has(input:checked),
:root[data-theme="dark"] .match-tile.is-selected,
:root[data-theme="dark"] .speed-tile.is-selected,
:root[data-theme="dark"] .icon-button:hover,
:root[data-theme="dark"] .icon-button.is-speaking {
  background: #163b38;
  box-shadow: inset 0 0 0 1px var(--accent);
}

:root[data-theme="dark"] .study-card.is-correct,
:root[data-theme="dark"] .study-card .option.is-correct-option,
:root[data-theme="dark"] .study-card .option.is-correct-option:has(input:checked),
:root[data-theme="dark"] .match-tile.is-correct-link,
:root[data-theme="dark"] .speed-tile.is-matched,
:root[data-theme="dark"] .learn-card.is-correct .learn-actions .button.is-selected,
:root[data-theme="dark"] .result-item.ok,
:root[data-theme="dark"] .flash-success {
  background: var(--ok-bg);
  border-color: #2fbf8f;
  color: var(--text);
}

:root[data-theme="dark"] .study-card.is-wrong,
:root[data-theme="dark"] .study-card .option.is-wrong-option,
:root[data-theme="dark"] .study-card .option.is-wrong-option:has(input:checked),
:root[data-theme="dark"] .match-tile.is-wrong-link,
:root[data-theme="dark"] .speed-tile.is-wrong,
:root[data-theme="dark"] .learn-card.is-wrong .learn-actions .button.is-selected,
:root[data-theme="dark"] .result-item.bad,
:root[data-theme="dark"] .flash-error {
  background: var(--bad-bg);
  border-color: #ef7777;
  color: var(--text);
}

:root[data-theme="dark"] .study-card.is-correct::after {
  background: #139b8d;
}

:root[data-theme="dark"] .match-tile.is-linked {
  background: #1e2630;
}

:root[data-theme="dark"] .match-lines line.is-draft {
  stroke: #78869a;
}

:root[data-theme="dark"] .speed-result {
  background: #123229;
  border-color: #2fbf8f;
  color: var(--accent-strong);
}

:root[data-theme="dark"] .swipe-track {
  background: #222c36;
}

:root[data-theme="dark"] .swipe-confirm[data-disabled="false"] .swipe-track {
  background: #163b38;
}

:root[data-theme="dark"] .swipe-handle {
  background: #171d24;
}

:root[data-theme="dark"] .sticky-actions {
  background: linear-gradient(to top, var(--bg) 70%, rgba(16, 20, 24, 0));
}

@media (max-width: 860px) {
  .layout-two,
  .inline-form,
  .control-grid,
  .option-grid,
  .match-row,
  .match-board,
  .speed-stats,
  .study-stat-grid {
    grid-template-columns: 1fr;
  }

  .study-deck {
    min-height: 620px;
  }

  .study-card {
    min-height: 580px;
    padding: 20px;
  }

  .auth-layout {
    grid-template-columns: 1fr;
  }

  .match-card {
    min-height: 720px;
  }

  .match-deck {
    min-height: 780px;
  }

  .match-board {
    gap: 28px;
  }

  .page-head {
    display: grid;
  }

  .topbar {
    padding: 0 16px;
  }

  .topnav {
    gap: 10px;
  }

  .nav-form span {
    display: none;
  }
}