:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #182033;
  --muted: #687089;
  --primary: #4f46e5;
  --primary-dark: #3730a3;
  --border: #e2e8f0;
  --learned: #16a34a;
  --partial: #f59e0b;
  --unknown: #ef4444;
  --shadow: 0 18px 50px rgba(25, 35, 70, .10);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(135deg, #eef2ff 0%, #f8fafc 55%, #ecfeff 100%);
  color: var(--text);
}

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

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
}

.sidebar {
  background: rgba(255, 255, 255, .78);
  border-right: 1px solid var(--border);
  padding: 24px;
  position: sticky;
  top: 0;
  height: 100vh;
  backdrop-filter: blur(20px);
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 30px;
}

.brand-icon {
  width: 52px;
  height: 52px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  color: white;
  font-weight: 900;
  font-size: 26px;
  background: linear-gradient(135deg, var(--primary), #06b6d4);
  box-shadow: var(--shadow);
}

.brand h1 {
  margin: 0;
  font-size: 22px;
}

.brand p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.menu {
  display: grid;
  gap: 10px;
}

.menu-item {
  border: 0;
  background: transparent;
  color: var(--muted);
  text-align: left;
  padding: 13px 14px;
  border-radius: 16px;
  cursor: pointer;
  transition: .2s;
}

.menu-item:hover,
.menu-item.active {
  background: #eef2ff;
  color: var(--primary-dark);
  font-weight: 700;
}

.tip-box {
  margin-top: 26px;
  padding: 16px;
  border-radius: 18px;
  background: #111827;
  color: white;
  display: grid;
  gap: 8px;
}

.tip-box span {
  color: #d1d5db;
  font-size: 14px;
}

.content {
  padding: 34px;
  max-width: none;
  width: 100%;
}

.page {
  display: none;
}

.page.active {
  display: block;
}

.hero {
  border-radius: 32px;
  padding: 32px;
  background: linear-gradient(135deg, #4338ca, #0891b2);
  color: white;
  display: grid;
  grid-template-columns: 1fr 230px;
  gap: 24px;
  box-shadow: var(--shadow);
}

.eyebrow {
  display: inline-block;
  margin-bottom: 8px;
  color: #c7d2fe;
  font-weight: 700;
}

.hero h2 {
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.05;
  margin: 0 0 14px;
}

.hero p {
  margin: 0;
  max-width: 680px;
  color: #e0f2fe;
}

.hero-card {
  border-radius: 24px;
  background: rgba(255,255,255,.16);
  padding: 22px;
  display: grid;
  gap: 8px;
  align-content: center;
  border: 1px solid rgba(255,255,255,.25);
}

.hero-card strong {
  font-size: 30px;
}

.stats-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.stat-card {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 24px;
  padding: 22px;
  text-align: left;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(25, 35, 70, .06);
  transition: .2s;
}

.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.stat-card span {
  color: var(--muted);
}

.stat-card strong {
  display: block;
  font-size: 36px;
  margin: 7px 0;
}

.stat-card small {
  color: var(--muted);
}

.stat-card.learned strong { color: var(--learned); }
.stat-card.partial strong { color: var(--partial); }
.stat-card.unknown strong { color: var(--unknown); }

.panel, .game-settings, .word-form, .game-area {
  margin-top: 24px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.85);
  border-radius: 28px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(25, 35, 70, .06);
}

.panel-header, .page-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-bottom: 20px;
}

.page-header h2, .panel h3 {
  margin: 0 0 5px;
}

.page-header p, .panel p {
  margin: 0;
  color: var(--muted);
}

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

.search, .select, input, textarea {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  background: white;
  outline: none;
}

.search:focus, .select:focus, input:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, .12);
}

.primary-btn, .secondary-btn, .status-btn, .choice-btn {
  border: 0;
  border-radius: 15px;
  padding: 12px 16px;
  cursor: pointer;
  transition: .2s;
}

.primary-btn {
  background: var(--primary);
  color: white;
  font-weight: 800;
}

.primary-btn:hover {
  background: var(--primary-dark);
}

.secondary-btn {
  background: #eef2ff;
  color: var(--primary-dark);
  font-weight: 700;
}

.word-list {
  display: grid;
  gap: 14px;
}

.word-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 18px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
  box-shadow: 0 6px 20px rgba(25, 35, 70, .05);
}

.word-title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.word-title h3 {
  margin: 0;
  font-size: 24px;
}

.word-title span {
  color: var(--muted);
}

.badges {
  display: flex;
  gap: 8px;
  margin: 10px 0;
  flex-wrap: wrap;
}

.badge {
  background: #f1f5f9;
  color: #475569;
  border-radius: 999px;
  padding: 5px 9px;
  font-size: 12px;
  font-weight: 700;
}

.example {
  background: #f8fafc;
  border-radius: 14px;
  padding: 12px;
  margin-top: 10px;
  color: #334155;
}

.note {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
}

.word-actions {
  display: grid;
  align-content: start;
  gap: 8px;
  min-width: 170px;
}

.status-btn {
  background: #f8fafc;
  color: var(--text);
  border: 1px solid var(--border);
}

.status-btn.active.unknown { background: #fee2e2; border-color: #fecaca; color: #991b1b; }
.status-btn.active.partial { background: #fef3c7; border-color: #fde68a; color: #92400e; }
.status-btn.active.learned { background: #dcfce7; border-color: #bbf7d0; color: #166534; }

.mini-list {
  display: grid;
  gap: 10px;
}

.mini-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  background: #f8fafc;
  border-radius: 16px;
  padding: 12px 14px;
}

.game-settings {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  align-items: end;
}

.game-settings label, .word-form label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-weight: 700;
  font-size: 14px;
}

.game-area.empty {
  text-align: center;
  color: var(--muted);
}

.question-card {
  display: grid;
  gap: 16px;
}

.question-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-weight: 700;
}

.prompt {
  font-size: clamp(28px, 5vw, 44px);
  margin: 4px 0;
}

.answer-row {
  display: flex;
  gap: 10px;
}

.answer-row input {
  flex: 1;
}

.feedback {
  padding: 14px;
  border-radius: 16px;
  font-weight: 700;
}

.feedback.ok { background: #dcfce7; color: #166534; }
.feedback.bad { background: #fee2e2; color: #991b1b; }

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

.choice-btn {
  background: #f8fafc;
  border: 1px solid var(--border);
  text-align: left;
  font-weight: 700;
}

.choice-btn:hover {
  border-color: var(--primary);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.word-form {
  display: grid;
  gap: 14px;
}

textarea {
  min-height: 90px;
  resize: vertical;
}

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

.small-note code {
  display: inline-block;
  margin-top: 12px;
  background: #111827;
  color: white;
  padding: 10px 12px;
  border-radius: 12px;
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .menu {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero, .stats-grid, .game-settings {
    grid-template-columns: 1fr 1fr;
  }

  .word-card {
    grid-template-columns: 1fr;
  }

  .word-actions {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 640px) {
  .content, .sidebar {
    padding: 18px;
  }

  .hero, .stats-grid, .game-settings, .form-grid, .choice-grid {
    grid-template-columns: 1fr;
  }

  .page-header, .panel-header, .answer-row {
    flex-direction: column;
    align-items: stretch;
  }

  .menu {
    grid-template-columns: 1fr;
  }

  .word-actions {
    grid-template-columns: 1fr;
  }
}


.progress-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.progress-pill {
  background: #eef2ff;
  color: #3730a3;
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 800;
}

.smart-score {
  background: #fff7ed;
  color: #9a3412;
}

.question-prompt-box {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 18px;
}

.question-prompt-box small {
  color: var(--muted);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .06em;
}

.hidden-hint {
  border: 1px dashed #cbd5e1;
  background: #f8fafc;
  color: var(--muted);
  border-radius: 16px;
  padding: 14px;
  font-weight: 700;
}

.count-pill {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  background: #eef2ff;
  color: var(--primary-dark);
  border-radius: 999px;
  padding: 10px 13px;
  font-weight: 800;
  border: 1px solid #c7d2fe;
}

.compact-toggle {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
  background: white;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 10px 12px;
  color: var(--muted);
  font-weight: 800;
}

.row-no {
  min-width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  border-radius: 12px;
  background: #f1f5f9;
  color: #475569;
  font-weight: 900;
}

.word-list.compact {
  gap: 8px;
}

.compact-card {
  padding: 12px 14px;
  grid-template-columns: 1fr auto;
}

.compact-card .word-title h3 {
  font-size: 20px;
}

.compact-card .badges {
  margin: 7px 0 0;
}

.compact-card .word-actions {
  grid-template-columns: repeat(5, auto);
  min-width: 0;
  align-items: center;
}

.compact-card .status-btn,
.compact-card .secondary-btn {
  padding: 8px 10px;
  border-radius: 11px;
  font-size: 13px;
}

.answer-mask {
  margin-top: 14px;
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  align-items: center;
}

.letter-slot {
  width: 26px;
  height: 34px;
  border-radius: 10px;
  background: white;
  border: 1px solid var(--border);
  display: inline-grid;
  place-items: center;
  color: #94a3b8;
  font-weight: 900;
  font-size: 18px;
}

.letter-space {
  width: 14px;
}

@media (max-width: 980px) {
  .compact-card,
  .word-card {
    grid-template-columns: 1fr;
  }

  .compact-card .word-actions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .compact-card .word-actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* v5 word list redesign */
.word-legend {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 0 0 14px;
}

.word-legend span {
  background: rgba(255,255,255,.86);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 11px;
  color: var(--muted);
  font-weight: 800;
  font-size: 13px;
}

.modern-list {
  gap: 12px;
}

.modern-word-card {
  padding: 0;
  overflow: hidden;
  display: block;
  border-left: 6px solid #cbd5e1;
}

.modern-word-card.status-unknown { border-left-color: var(--unknown); }
.modern-word-card.status-partial { border-left-color: var(--partial); }
.modern-word-card.status-learned { border-left-color: var(--learned); }

.word-main {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 14px 16px;
}

.word-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.type-icon {
  width: 42px;
  height: 42px;
  display: inline-grid;
  place-items: center;
  border-radius: 16px;
  background: #eef2ff;
  font-size: 22px;
}

.word-center {
  min-width: 0;
}

.word-title-line {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.word-title-line h3 {
  margin: 0;
  font-size: 23px;
}

.translation {
  color: var(--muted);
  font-weight: 800;
}

.word-meta-line {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.mini-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: #f8fafc;
  border: 1px solid var(--border);
  color: #475569;
  border-radius: 999px;
  padding: 5px 8px;
  font-size: 12px;
  font-weight: 800;
}

.word-example-line {
  margin-top: 10px;
  display: flex;
  gap: 8px;
  align-items: baseline;
  flex-wrap: wrap;
  color: #334155;
}

.word-example-line em {
  color: var(--muted);
  font-style: normal;
}

.word-stats-box {
  display: grid;
  grid-template-columns: repeat(4, 62px);
  gap: 7px;
}

.word-stats-box div {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 8px 6px;
  text-align: center;
}

.word-stats-box b {
  display: block;
  font-size: 18px;
}

.word-stats-box span {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.word-card-footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid var(--border);
  background: #fbfdff;
  padding: 10px 16px;
}

.status-group,
.card-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.danger-soft {
  background: #fff1f2;
  color: #9f1239;
}

.slot-answer-wrap {
  display: grid;
  gap: 14px;
}

.slot-answer {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  padding: 14px;
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 18px;
}

.slot-input {
  width: 38px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid #cbd5e1;
  background: white;
  text-align: center;
  font-weight: 900;
  font-size: 20px;
  padding: 0;
  text-transform: lowercase;
}

.slot-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, .12);
}

.slot-space {
  width: 16px;
  height: 1px;
}

@media (max-width: 980px) {
  .word-main {
    grid-template-columns: auto 1fr;
  }

  .word-stats-box {
    grid-column: 1 / -1;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .word-card-footer {
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .word-main {
    grid-template-columns: 1fr;
  }

  .word-left {
    justify-content: space-between;
  }

  .word-stats-box {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .status-group,
  .card-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .slot-input {
    width: 34px;
    height: 40px;
  }
}

/* v6 reports */
.report-summary {
  margin-top: 0;
  margin-bottom: 22px;
}

.daily-chart {
  display: grid;
  gap: 12px;
}

.chart-row {
  display: grid;
  grid-template-columns: 96px 1fr 48px;
  gap: 12px;
  align-items: center;
}

.chart-date {
  color: var(--muted);
  font-weight: 800;
  font-size: 13px;
}

.chart-bars {
  display: grid;
  gap: 5px;
}

.chart-bar {
  min-width: 28px;
  height: 16px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 7px;
  font-size: 11px;
  font-weight: 900;
  color: white;
  transition: width .25s ease;
}

.chart-bar.correct {
  background: var(--learned);
}

.chart-bar.wrong {
  background: var(--unknown);
}

.chart-total {
  text-align: right;
  color: var(--muted);
  font-weight: 900;
}

.daily-report-list {
  display: grid;
  gap: 10px;
}

.daily-row {
  display: grid;
  grid-template-columns: 1.2fr repeat(4, 1fr);
  gap: 10px;
  align-items: center;
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 12px 14px;
}

.daily-row span {
  color: var(--muted);
  font-weight: 800;
  font-size: 13px;
}

.empty-report {
  padding: 18px;
  border-radius: 18px;
  background: #f8fafc;
  color: var(--muted);
  font-weight: 800;
  text-align: center;
}

.today-card strong {
  color: var(--primary);
}

@media (max-width: 640px) {
  .chart-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .chart-total {
    text-align: left;
  }

  .daily-row {
    grid-template-columns: 1fr;
  }
}

.count-pill.soft {
  background: #f8fafc;
  color: var(--muted);
  border-color: var(--border);
}

.save-status {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  border-radius: 999px;
  padding: 10px 13px;
  font-weight: 800;
  border: 1px solid var(--border);
  background: #f8fafc;
  color: var(--muted);
}

.save-status.ok {
  background: #dcfce7;
  border-color: #bbf7d0;
  color: #166534;
}

.save-status.warn {
  background: #fef3c7;
  border-color: #fde68a;
  color: #92400e;
}

.save-status.error {
  background: #fee2e2;
  border-color: #fecaca;
  color: #991b1b;
}

.save-status.info {
  background: #eef2ff;
  border-color: #c7d2fe;
  color: var(--primary-dark);
}

/* v3 UX polish */
.hero-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 22px;
}

.dashboard-grid {
  grid-template-columns: repeat(7, minmax(0, 1fr));
}

.dashboard-panels,
.report-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.clean-header {
  margin-bottom: 16px;
}

.word-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.search-wrap {
  flex: 1;
  min-width: 260px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: white;
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 0 14px;
}

.search-wrap .search {
  border: 0;
  box-shadow: none;
  width: 100%;
  padding-left: 0;
}

.search-wrap .search:focus {
  box-shadow: none;
}

.status-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.status-tab {
  border: 1px solid var(--border);
  background: rgba(255,255,255,.9);
  border-radius: 999px;
  padding: 10px 14px;
  cursor: pointer;
  font-weight: 900;
  color: #475569;
  transition: .2s;
}

.status-tab b {
  margin-left: 5px;
  background: #f1f5f9;
  border-radius: 999px;
  padding: 2px 7px;
}

.status-tab.active,
.status-tab:hover {
  color: var(--primary-dark);
  background: #eef2ff;
  border-color: #c7d2fe;
}

.hidden-filter {
  display: none;
}

.question-top {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 10px 12px;
}

.game-summary {
  text-align: center;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0;
}

.summary-grid div {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 16px 10px;
}

.summary-grid b {
  display: block;
  font-size: 28px;
}

.summary-grid span {
  color: var(--muted);
  font-weight: 800;
}

.home-mini-chart {
  display: grid;
  gap: 10px;
}

.mini-chart-row {
  display: grid;
  grid-template-columns: 54px 1fr 36px;
  gap: 10px;
  align-items: center;
}

.mini-chart-row span,
.mini-chart-row b {
  color: var(--muted);
  font-weight: 900;
  font-size: 13px;
}

.mini-chart-row div {
  height: 12px;
  background: #f1f5f9;
  border-radius: 999px;
  overflow: hidden;
}

.mini-chart-row i {
  display: block;
  height: 100%;
  background: var(--primary);
  border-radius: 999px;
}

.hard-word-list {
  display: grid;
  gap: 10px;
}

.hard-word {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 12px 14px;
}

.hard-word strong {
  display: block;
}

.hard-word span {
  color: var(--muted);
}

.hard-word em {
  font-style: normal;
  background: #fee2e2;
  color: #991b1b;
  border-radius: 999px;
  padding: 5px 9px;
  font-weight: 900;
  white-space: nowrap;
}

.floating-save {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 20;
  opacity: .92;
  transform: scale(.92);
}

.floating-save.ok {
  animation: fadeSave 2s forwards;
}

@keyframes fadeSave {
  0%, 70% { opacity: .95; }
  100% { opacity: .25; }
}

@media (max-width: 1180px) {
  .dashboard-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .dashboard-panels,
  .report-layout {
    grid-template-columns: 1fr;
  }

  .dashboard-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .dashboard-grid,
  .summary-grid {
    grid-template-columns: 1fr;
  }

  .status-tabs {
    display: grid;
    grid-template-columns: 1fr;
  }

  .word-toolbar {
    align-items: stretch;
  }

  .search-wrap {
    min-width: 0;
  }
}

/* v5 polish */
.answer-result {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  border-radius: 18px;
  padding: 14px 16px;
  margin-top: 6px;
}

.answer-result.ok {
  background: #dcfce7;
  color: #166534;
}

.answer-result.bad {
  background: #fee2e2;
  color: #991b1b;
}

.answer-result strong {
  display: block;
  font-size: 18px;
}

.answer-result span {
  display: block;
  margin-top: 3px;
  font-weight: 800;
}

.next-btn {
  white-space: nowrap;
  align-self: center;
}

.mini-chart-legend {
  display: flex;
  gap: 12px;
  color: var(--muted);
  font-weight: 900;
  font-size: 13px;
  margin-bottom: 4px;
}

.mini-chart-legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.correct-dot,
.wrong-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  display: inline-block;
}

.correct-dot {
  background: var(--learned);
}

.wrong-dot {
  background: var(--unknown);
}

.mini-chart-row.split {
  grid-template-columns: 54px 1fr 58px;
}

.split-track {
  min-width: 28px;
  height: 14px;
  background: #f1f5f9;
  border-radius: 999px;
  overflow: hidden;
  display: flex;
}

.split-track .correct-part {
  height: 100%;
  background: var(--learned);
}

.split-track .wrong-part {
  height: 100%;
  background: var(--unknown);
}

@media (max-width: 640px) {
  .answer-result {
    align-items: stretch;
    flex-direction: column;
  }

  .next-btn {
    width: 100%;
  }
}

.next-btn:disabled {
  opacity: .55;
  cursor: not-allowed;
}

/* v8 sidebar redesign */
.sidebar {
  background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(248,250,252,.88));
}

.sidebar-brand {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: rgba(255,255,255,.78);
  box-shadow: 0 8px 24px rgba(25, 35, 70, .05);
}

.sidebar-brand .brand-icon {
  width: 48px;
  height: 48px;
  font-size: 17px;
}

.menu {
  gap: 8px;
}

.menu-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border: 1px solid transparent;
  position: relative;
}

.menu-item.active {
  border-color: #c7d2fe;
  box-shadow: 0 8px 20px rgba(79, 70, 229, .08);
}

.menu-item.active::before {
  content: "";
  width: 4px;
  height: 28px;
  border-radius: 999px;
  background: var(--primary);
  position: absolute;
  left: -2px;
}

.menu-icon {
  width: 42px;
  height: 42px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: #f8fafc;
  border: 1px solid var(--border);
  font-size: 20px;
  flex: 0 0 auto;
}

.menu-item.active .menu-icon {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.menu-text {
  display: grid;
  gap: 2px;
}

.menu-text b {
  font-size: 15px;
  color: var(--text);
}

.menu-text small {
  color: var(--muted);
  font-size: 12px;
}

.sidebar-progress {
  margin-top: 22px;
  padding: 16px;
  border-radius: 22px;
  background: #111827;
  color: white;
  display: grid;
  gap: 10px;
  box-shadow: var(--shadow);
}

.sidebar-progress-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 900;
}

.sidebar-progress-bar {
  height: 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.16);
  overflow: hidden;
}

.sidebar-progress-bar i {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #818cf8, #22d3ee);
  border-radius: 999px;
  transition: width .25s ease;
}

.sidebar-progress small {
  color: #d1d5db;
  font-weight: 700;
}

@media (max-width: 980px) {
  .sidebar-progress {
    margin-top: 14px;
  }

  .menu-item {
    min-height: 76px;
  }
}

/* v9 backup page */
.backup-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.backup-card {
  display: grid;
  gap: 12px;
  align-content: start;
}

.backup-card.full {
  grid-column: 1 / -1;
}

.backup-icon {
  width: 54px;
  height: 54px;
  border-radius: 20px;
  display: grid;
  place-items: center;
  background: #eef2ff;
  font-size: 26px;
}

.backup-card h3 {
  margin: 0;
}

.backup-card p,
.backup-note p {
  color: var(--muted);
  margin: 0;
}

.backup-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

.file-btn {
  border: 0;
  border-radius: 15px;
  padding: 12px 16px;
  cursor: pointer;
  transition: .2s;
  background: #eef2ff;
  color: var(--primary-dark);
  font-weight: 800;
  display: inline-flex;
  align-items: center;
}

.file-btn.secondary {
  background: #f8fafc;
  color: var(--text);
  border: 1px solid var(--border);
}

.file-btn input {
  display: none;
}

.backup-note {
  margin-top: 18px;
}

.backup-status {
  margin-top: 14px;
  border-radius: 16px;
  padding: 12px 14px;
  background: #f8fafc;
  border: 1px solid var(--border);
  color: var(--muted);
  font-weight: 800;
}

.backup-status.ok {
  background: #dcfce7;
  border-color: #bbf7d0;
  color: #166534;
}

.backup-status.error {
  background: #fee2e2;
  border-color: #fecaca;
  color: #991b1b;
}

@media (max-width: 760px) {
  .backup-grid {
    grid-template-columns: 1fr;
  }

  .backup-card.full {
    grid-column: auto;
  }
}

.sort-select{
border:1px solid var(--border);
border-radius:14px;
padding:10px 12px;
background:white;
font-weight:700;
min-width:220px;
}

/* v11 word card visual polish */
.type-icon {
  width: 58px;
  height: 58px;
  gap: 2px;
  display: grid;
  place-items: center;
  align-content: center;
}

.type-icon b {
  font-size: 23px;
  line-height: 1;
}

.type-icon small {
  font-size: 10px;
  font-weight: 900;
  color: var(--primary-dark);
}

.pretty-stats {
  grid-template-columns: repeat(2, 74px);
}

.pretty-stats div {
  position: relative;
  overflow: hidden;
  padding: 9px 7px;
}

.pretty-stats i {
  display: block;
  font-style: normal;
  font-size: 16px;
  margin-bottom: 2px;
}

.pretty-stats .seen {
  background: #eef2ff;
  border-color: #c7d2fe;
}

.pretty-stats .correct {
  background: #dcfce7;
  border-color: #bbf7d0;
}

.pretty-stats .wrong {
  background: #fee2e2;
  border-color: #fecaca;
}

.pretty-stats .rate {
  background: #fef3c7;
  border-color: #fde68a;
}

.pretty-stats .seen b { color: #3730a3; }
.pretty-stats .correct b { color: #166534; }
.pretty-stats .wrong b { color: #991b1b; }
.pretty-stats .rate b { color: #92400e; }

.pretty-stats span {
  font-size: 10px;
}

@media (max-width: 980px) {
  .pretty-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .pretty-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* v13 dashboard today detail */
.today-detail-panels {
  margin-top: 18px;
}

.today-word-list {
  display: grid;
  gap: 10px;
}

.today-word-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid var(--border);
  background: #f8fafc;
  border-radius: 16px;
  padding: 12px 14px;
}

.today-word-item strong {
  display: block;
  font-size: 15px;
}

.today-word-item span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-top: 2px;
}

.today-word-item b {
  min-width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  font-size: 15px;
}

.today-word-item.correct b {
  background: #dcfce7;
  color: #166534;
}

.today-word-item.wrong b {
  background: #fee2e2;
  color: #991b1b;
}

/* v15 mobile usability fixes */
html,
body {
  max-width: 100%;
  overflow-x: hidden;
}

img,
svg,
canvas,
table {
  max-width: 100%;
}

@media (max-width: 760px) {
  .app-shell {
    display: block;
    width: 100%;
    min-width: 0;
  }

  .sidebar {
    height: auto;
    position: static;
    padding: 14px;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .sidebar-brand {
    margin-bottom: 12px;
  }

  .brand h1 {
    font-size: 19px;
  }

  .brand p {
    font-size: 12px;
  }

  .menu {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .menu-item {
    min-height: 64px;
    padding: 9px;
    border-radius: 16px;
  }

  .menu-icon {
    width: 34px;
    height: 34px;
    border-radius: 13px;
    font-size: 17px;
  }

  .menu-text b {
    font-size: 13px;
  }

  .menu-text small {
    font-size: 10px;
  }

  .sidebar-progress {
    margin-top: 12px;
    padding: 13px;
    border-radius: 18px;
  }

  .content {
    padding: 14px;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
  }

  .hero {
    grid-template-columns: 1fr;
    padding: 20px;
    border-radius: 24px;
    gap: 16px;
  }

  .hero h2 {
    font-size: 28px;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .hero-card {
    padding: 16px;
  }

  .stats-grid,
  .dashboard-grid,
  .report-summary {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    gap: 10px;
  }

  .stat-card {
    padding: 14px;
    border-radius: 18px;
  }

  .stat-card strong {
    font-size: 28px;
  }

  .stat-card span,
  .stat-card small {
    font-size: 12px;
  }

  .dashboard-panels,
  .report-layout,
  .today-detail-panels,
  .backup-grid,
  .game-settings,
  .form-grid {
    grid-template-columns: 1fr !important;
    gap: 12px;
  }

  .panel,
  .game-settings,
  .word-form,
  .game-area {
    padding: 16px;
    border-radius: 20px;
    margin-top: 16px;
  }

  .panel-header,
  .page-header {
    align-items: stretch;
    flex-direction: column;
    gap: 8px;
  }

  .page-header h2 {
    font-size: 23px;
  }

  .word-toolbar {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .search-wrap {
    min-width: 0;
    width: 100%;
  }

  .sort-select,
  .count-pill,
  .search {
    width: 100%;
    min-width: 0;
  }

  .status-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .status-tab {
    padding: 10px;
    text-align: left;
    font-size: 13px;
  }

  .word-main {
    grid-template-columns: 1fr !important;
    gap: 12px;
    padding: 14px;
  }

  .word-left {
    display: flex;
    justify-content: space-between;
    width: 100%;
  }

  .word-title-line {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .word-title-line h3 {
    font-size: 22px;
    word-break: break-word;
  }

  .translation {
    font-size: 15px;
    word-break: break-word;
  }

  .word-meta-line {
    gap: 6px;
  }

  .mini-chip {
    font-size: 11px;
    padding: 5px 7px;
  }

  .word-example-line {
    display: grid;
    grid-template-columns: auto 1fr;
    font-size: 13px;
  }

  .word-example-line em {
    grid-column: 2;
    word-break: break-word;
  }

  .word-stats-box,
  .pretty-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    width: 100%;
  }

  .word-card-footer {
    flex-direction: column;
    padding: 12px;
  }

  .status-group,
  .card-actions {
    display: grid;
    grid-template-columns: 1fr;
    width: 100%;
  }

  .status-btn,
  .secondary-btn,
  .primary-btn,
  .file-btn {
    width: 100%;
    justify-content: center;
    min-height: 44px;
  }

  .question-prompt-box {
    padding: 15px;
  }

  .prompt {
    font-size: 30px;
    word-break: break-word;
  }

  .slot-answer {
    gap: 6px;
    padding: 10px;
  }

  .slot-input {
    width: 34px;
    height: 40px;
    font-size: 18px;
  }

  .answer-result {
    flex-direction: column;
    align-items: stretch;
  }

  .summary-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .daily-row {
    grid-template-columns: 1fr !important;
    gap: 6px;
  }

  .chart-row {
    grid-template-columns: 1fr !important;
  }

  .floating-save {
    right: 10px;
    left: 10px;
    bottom: 10px;
    justify-content: center;
    transform: none;
  }
}

@media (max-width: 420px) {
  .menu {
    grid-template-columns: 1fr;
  }

  .stats-grid,
  .dashboard-grid,
  .report-summary,
  .status-tabs,
  .summary-grid {
    grid-template-columns: 1fr !important;
  }

  .slot-input {
    width: 31px;
    height: 38px;
  }

  .type-icon {
    width: 50px;
    height: 50px;
  }
}

/* v16 wrong words full scroll list */
.hard-word-list {
  max-height: 430px;
  overflow-y: auto;
  padding-right: 6px;
  scrollbar-width: thin;
}

.hard-word-list::-webkit-scrollbar {
  width: 8px;
}

.hard-word-list::-webkit-scrollbar-track {
  background: #f1f5f9;
  border-radius: 999px;
}

.hard-word-list::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 999px;
}

.hard-word-stats {
  display: grid;
  justify-items: end;
  gap: 4px;
}

.hard-word-stats small {
  color: var(--muted);
  font-weight: 800;
  white-space: nowrap;
}

@media (max-width: 640px) {
  .hard-word-list {
    max-height: 360px;
  }

  .hard-word {
    align-items: flex-start;
  }

  .hard-word-stats {
    justify-items: start;
  }
}

/* v19 today detail page */
.today-filter-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 16px 0;
}

.today-filter {
  border: 1px solid var(--border);
  background: rgba(255,255,255,.9);
  border-radius: 999px;
  padding: 10px 14px;
  cursor: pointer;
  font-weight: 900;
  color: #475569;
  transition: .2s;
}

.today-filter.active,
.today-filter:hover {
  color: var(--primary-dark);
  background: #eef2ff;
  border-color: #c7d2fe;
}

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

.today-detail-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: center;
  border: 1px solid var(--border);
  border-left: 6px solid #cbd5e1;
  border-radius: 18px;
  background: #fff;
  padding: 14px 16px;
}

.today-detail-item.has-wrong {
  border-left-color: var(--unknown);
}

.today-detail-item.only-correct {
  border-left-color: var(--learned);
}

.today-detail-word strong {
  display: block;
  font-size: 20px;
}

.today-detail-word span {
  display: block;
  color: var(--muted);
  font-weight: 800;
  margin-top: 3px;
}

.today-detail-word small {
  display: block;
  color: #64748b;
  margin-top: 8px;
}

.today-detail-stats {
  display: grid;
  grid-template-columns: repeat(4, 64px);
  gap: 8px;
}

.today-detail-stats div {
  border: 1px solid var(--border);
  background: #f8fafc;
  border-radius: 14px;
  text-align: center;
  padding: 8px 6px;
}

.today-detail-stats .correct {
  background: #dcfce7;
  border-color: #bbf7d0;
  color: #166534;
}

.today-detail-stats .wrong {
  background: #fee2e2;
  border-color: #fecaca;
  color: #991b1b;
}

.today-detail-stats b {
  display: block;
  font-size: 18px;
}

.today-detail-stats span {
  display: block;
  color: var(--muted);
  font-size: 10px;
  font-weight: 900;
}

@media (max-width: 760px) {
  .today-filter-tabs {
    display: grid;
    grid-template-columns: 1fr;
  }

  .today-detail-item {
    grid-template-columns: 1fr;
  }

  .today-detail-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* v21 today detail rich cards */
.rich-today-card {
  grid-template-columns: auto 1fr auto;
  gap: 14px;
}

.today-detail-left {
  display: flex;
  align-items: center;
}

.rich-today-card .today-detail-word strong {
  display: inline;
}

.rich-today-card .today-detail-word span {
  margin-top: 0;
}

.rich-today-card .word-title-line h3 {
  margin: 0;
}

.rich-today-card .word-example-line {
  margin-top: 10px;
}

.rich-today-card .today-detail-stats {
  grid-template-columns: repeat(2, 72px);
}

.rich-today-card .today-detail-stats div {
  padding: 9px 6px;
}

.rich-today-card .today-detail-stats i {
  display: block;
  font-style: normal;
  font-size: 16px;
  margin-bottom: 2px;
}

@media (max-width: 900px) {
  .rich-today-card {
    grid-template-columns: 1fr;
  }

  .today-detail-left {
    justify-content: flex-start;
  }

  .rich-today-card .today-detail-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .rich-today-card .today-detail-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* v22 save error visibility */
.save-error-box {
  position: fixed;
  left: 18px;
  right: 18px;
  bottom: 18px;
  z-index: 9999;
  max-width: 560px;
  margin: 0 auto;
  background: #fee2e2;
  border: 1px solid #fecaca;
  color: #991b1b;
  border-radius: 18px;
  padding: 14px 16px;
  box-shadow: 0 18px 50px rgba(127, 29, 29, .18);
  display: grid;
  gap: 4px;
}

.save-error-box strong {
  font-size: 15px;
}

.save-error-box span {
  font-weight: 700;
  font-size: 13px;
}

.save-error-box[hidden] {
  display: none;
}

/* v25 answer status selector */
.answer-learning-card {
  display: grid;
  gap: 12px;
}

.answer-status-box {
  margin-top: 12px;
  border: 1px solid var(--border);
  background: #f8fafc;
  border-radius: 18px;
  padding: 14px;
  display: grid;
  gap: 12px;
}

.answer-status-box strong {
  display: block;
}

.answer-status-box small {
  display: block;
  color: var(--muted);
  font-weight: 700;
  margin-top: 4px;
}

.answer-status-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.answer-status-actions .status-btn {
  min-height: 40px;
}

@media (max-width: 640px) {
  .answer-status-actions {
    display: grid;
    grid-template-columns: 1fr;
  }
}

/* v31 compact word list stats */
.modern-word-card .compact-stats {
  grid-template-columns: repeat(2, 86px);
  gap: 8px;
}

.modern-word-card .compact-stats div {
  min-height: 56px;
  padding: 8px 9px;
  display: grid;
  align-content: center;
  gap: 4px;
  text-align: left;
}

.modern-word-card .compact-stats span {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 900;
  line-height: 1;
}

.modern-word-card .compact-stats i {
  display: inline;
  font-size: 14px;
  margin: 0;
}

.modern-word-card .compact-stats b {
  font-size: 20px;
  line-height: 1;
  text-align: center;
}

@media (max-width: 980px) {
  .modern-word-card .compact-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .modern-word-card .compact-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* v33 word note display */
.word-note-line {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px;
  align-items: start;
  margin-top: 8px;
  padding: 9px 11px;
  border-radius: 14px;
  background: #f8fafc;
  border: 1px dashed var(--border);
  color: var(--muted);
  font-size: 13px;
}

.word-note-line em {
  font-style: normal;
  font-weight: 700;
  line-height: 1.35;
}

/* v34 compact today detail stats and fast game answer screen */
.rich-today-card .compact-stats,
.today-detail-stats.compact-stats {
  grid-template-columns: repeat(2, 86px);
  gap: 8px;
}

.rich-today-card .compact-stats div,
.today-detail-stats.compact-stats div {
  min-height: 56px;
  padding: 8px 9px;
  display: grid;
  align-content: center;
  gap: 4px;
  text-align: left;
}

.rich-today-card .compact-stats span,
.today-detail-stats.compact-stats span {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 900;
  line-height: 1;
}

.rich-today-card .compact-stats i,
.today-detail-stats.compact-stats i {
  display: inline;
  font-size: 14px;
  margin: 0;
}

.rich-today-card .compact-stats b,
.today-detail-stats.compact-stats b {
  font-size: 20px;
  line-height: 1;
  text-align: center;
}

.compact-answer-card {
  display: grid;
  gap: 10px;
  padding: 12px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: #fff;
}

.answer-word-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: center;
}

.compact-type {
  width: 48px;
  height: 48px;
  border-radius: 16px;
}

.compact-type b {
  font-size: 20px;
}

.compact-type small {
  font-size: 9px;
}

.answer-word-main .word-title-line h3 {
  margin: 0;
  font-size: 22px;
}

.answer-word-main .translation {
  font-size: 15px;
}

.answer-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.answer-info-box {
  border: 1px dashed var(--border);
  border-radius: 14px;
  background: #f8fafc;
  padding: 9px 11px;
  display: grid;
  gap: 4px;
}

.answer-info-box span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
}

.answer-info-box strong {
  font-size: 14px;
  line-height: 1.25;
}

.answer-info-box em {
  font-style: normal;
  color: var(--muted);
  font-weight: 700;
  font-size: 13px;
}

.compact-status-box {
  margin-top: 0;
  padding: 10px;
  border-radius: 14px;
  grid-template-columns: 1fr auto;
  align-items: center;
}

.compact-status-box small {
  font-size: 12px;
}

.compact-status-box .answer-status-actions {
  flex-wrap: nowrap;
}

.compact-status-box .status-btn {
  min-height: 36px;
  padding: 8px 10px;
  white-space: nowrap;
}

.answer-result {
  margin-top: 10px;
}

.feedback {
  margin-top: 10px;
}

.game-area {
  gap: 10px;
}

.question-prompt-box {
  padding-top: 14px;
  padding-bottom: 14px;
}

@media (max-width: 900px) {
  .rich-today-card .compact-stats,
  .today-detail-stats.compact-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .answer-info-grid {
    grid-template-columns: 1fr;
  }

  .compact-status-box {
    grid-template-columns: 1fr;
  }

  .compact-status-box .answer-status-actions {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
  }
}

@media (max-width: 560px) {
  .rich-today-card .compact-stats,
  .today-detail-stats.compact-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .answer-word-head {
    grid-template-columns: 1fr;
  }

  .compact-status-box .answer-status-actions {
    grid-template-columns: 1fr;
  }
}

/* v40 sentence games */
.sentence-builder {
  display: grid;
  gap: 16px;
}

.sentence-builder strong {
  display: block;
  font-size: 18px;
}

.sentence-builder small {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-weight: 800;
}

.sentence-selected,
.sentence-bank {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  min-height: 64px;
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 14px;
}

.sentence-selected {
  background: #eef2ff;
  border-color: #c7d2fe;
}

.sentence-selected.empty {
  background: #f8fafc;
  border-style: dashed;
  color: var(--muted);
  font-weight: 800;
}

.sentence-bank {
  background: #f8fafc;
}

.sentence-token {
  border: 1px solid var(--border);
  background: white;
  color: var(--text);
  border-radius: 14px;
  padding: 11px 14px;
  cursor: pointer;
  font-weight: 900;
  box-shadow: 0 4px 12px rgba(25, 35, 70, .05);
  transition: .2s;
}

.sentence-token:hover {
  border-color: var(--primary);
  transform: translateY(-1px);
}

.sentence-selected .sentence-token {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

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

.sentence-bank-empty {
  color: var(--muted);
  font-weight: 800;
}

@media (max-width: 640px) {
  .sentence-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .sentence-token {
    width: 100%;
    text-align: center;
  }
}

/* v42 sentence answer review */
.answer-result.sentence-result {
  align-items: stretch;
}

.answer-result.sentence-result > div {
  flex: 1;
}

.sentence-review {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.sentence-review-row {
  display: grid;
  gap: 6px;
  background: rgba(255, 255, 255, .62);
  border: 1px solid rgba(153, 27, 27, .16);
  border-radius: 14px;
  padding: 10px;
}

.sentence-review-row span {
  margin: 0;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: #7f1d1d;
}

.sentence-review-tokens {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
}

.sentence-review-tokens b,
.sentence-review-text {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  border-radius: 11px;
  padding: 7px 10px;
  background: white;
  color: var(--text);
  border: 1px solid var(--border);
  font-size: 14px;
}

.correct-answer .sentence-review-tokens b {
  background: #dcfce7;
  color: #166534;
  border-color: #bbf7d0;
}

.user-answer .sentence-review-tokens b,
.user-answer .sentence-review-text {
  background: #fff1f2;
  color: #991b1b;
  border-color: #fecdd3;
}

@media (max-width: 640px) {
  .sentence-review-tokens b,
  .sentence-review-text {
    width: 100%;
    justify-content: center;
  }
}