.drill-shell {
  display: grid;
  min-height: 100vh;
  grid-template-columns: 240px minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: 0;
  display: flex;
  height: 100vh;
  flex-direction: column;
  gap: 16px;
  border-right: 1px solid var(--border-subtle);
  background: var(--latte);
  padding: 20px 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 10px 18px;
  color: var(--ink);
  text-decoration: none;
}

.brand img {
  width: 28px;
  height: 28px;
}

.brand span {
  font-size: 17px;
  font-weight: 700;
}

.nav-list {
  display: grid;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  min-height: 36px;
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  text-align: left;
  text-decoration: none;
}

.nav-item.active {
  background: var(--ink);
  color: var(--panna);
}

.main-panel {
  min-width: 0;
}

.topbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid var(--border-subtle);
  padding: 22px 32px 18px;
}

.topbar h1 {
  margin: 2px 0 0;
  color: var(--ink);
  font-size: 30px;
  line-height: 1.15;
}

.topbar p:last-child {
  max-width: 720px;
  margin: 6px 0 0;
  color: var(--fg-muted);
}

.top-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  padding: 24px 32px 0;
}

.stat-card {
  min-height: 96px;
  padding: 16px;
}

.stat-card strong {
  display: block;
  margin-top: 6px;
  color: var(--mare);
  font-size: 30px;
  line-height: 1;
}

.stat-card span {
  display: block;
  margin-top: 4px;
  color: var(--fg-muted);
  font-size: 12px;
}

.drill-workspace {
  display: grid;
  align-items: start;
  grid-template-columns: minmax(420px, 1fr) 360px;
  gap: 14px;
  padding: 20px 32px 32px;
}

.prompt-card,
.control-card,
.history-card {
  min-width: 0;
  padding: 20px;
}

.prompt-card {
  display: grid;
  min-height: 488px;
  align-content: start;
  gap: 22px;
}

.prompt-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sentence-text {
  min-height: 150px;
  color: var(--ink-900);
  font-family: var(--font-serif);
  font-size: clamp(30px, 4vw, 54px);
  line-height: 1.13;
  letter-spacing: 0;
}

.sentence-text .blank {
  display: inline-block;
  min-width: 5.8ch;
  border-bottom: 3px solid var(--coralla);
  color: transparent;
  line-height: 0.95;
}

.answer-form {
  display: grid;
  align-items: end;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

.answer-field {
  display: grid;
  gap: 6px;
}

.answer-field span {
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
}

.answer-field input {
  width: 100%;
  min-height: 58px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--panna);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 28px;
  padding: 10px 14px;
}

.answer-actions {
  display: flex;
  align-self: end;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.answer-actions .a-button {
  align-self: end;
  min-height: 58px;
  min-width: 88px;
}

.answer-actions #check-button {
  min-width: 104px;
}

.answer-actions .a-button:disabled {
  cursor: default;
}

.hotkeys {
  display: flex;
  flex-wrap: wrap;
  gap: 9px 12px;
  color: var(--fg-muted);
  font-size: 12px;
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.7em;
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--nebbia-50);
  color: var(--nebbia-700);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
}

.feedback {
  min-height: 52px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--fg-muted);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.35;
  padding: 12px 14px;
}

.feedback[data-state="correct"] {
  border-color: rgba(62, 94, 149, 0.2);
  background: var(--nebbia-50);
  color: var(--ink);
}

.feedback[data-state="wrong"] {
  border-color: rgba(184, 68, 68, 0.25);
  background: #fff4f2;
  color: var(--danger);
}

.focus-strip {
  display: grid;
  gap: 8px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

.focus-word-list,
.pattern-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.focus-token,
.pattern-token {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  border-radius: var(--radius-full);
  background: var(--panna);
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
  padding: 6px 10px;
}

.side-stack {
  display: grid;
  gap: 14px;
}

.section-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}

.section-heading h2 {
  margin: 3px 0 0;
  color: var(--ink);
  font-size: 18px;
  line-height: 1.2;
}

.section-heading.compact {
  margin-bottom: 12px;
}

.segmented-grid,
.person-grid {
  display: grid;
  gap: 8px;
}

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

.person-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.toggle-button {
  min-height: 38px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--panna);
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
  padding: 8px 10px;
}

.toggle-button:disabled {
  background: var(--nebbia-50);
  color: var(--fg-muted);
  cursor: default;
  opacity: 1;
}

.toggle-button[aria-pressed="true"] {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--panna);
}

.toggle-button[data-priority="B1_NA"][aria-pressed="true"] {
  border-color: var(--coralla);
  background: var(--coralla);
}

.history-list {
  display: grid;
  gap: 8px;
  max-height: 296px;
  overflow: auto;
}

.history-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--panna);
  padding: 9px 10px;
}

.history-row strong {
  color: var(--ink);
  font-size: 13px;
}

.history-row span {
  color: var(--fg-muted);
  font-size: 12px;
}

.history-row[data-state="correct"] em {
  color: var(--mare);
}

.history-row[data-state="wrong"] em {
  color: var(--danger);
}

.history-row em {
  align-self: center;
  font-style: normal;
  font-weight: 900;
}

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

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

  .drill-workspace,
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .topbar,
  .stats-grid,
  .drill-workspace {
    padding-right: 16px;
    padding-left: 16px;
  }

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

  .answer-actions {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    justify-content: stretch;
  }

  .answer-actions .a-button {
    width: 100%;
    min-width: 0;
  }

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

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

  .sentence-text {
    min-height: 120px;
    font-size: 31px;
  }
}