:root {
  --bg-primary: #f5f6f8;
  --bg-secondary: #ffffff;
  --text-primary: #252b38;
  --text-secondary: #667085;
  --border-color: #e2e6ec;
  --accent: #435ac7;
  --accent-soft: #edf0fc;
  --bs-primary-rgb: 67, 90, 199;
}

body.dark-mode {
  --bg-primary: #171b23;
  --bg-secondary: #202630;
  --text-primary: #edf0f6;
  --text-secondary: #aab4c5;
  --border-color: #394353;
  --accent: #a4b4ff;
  --accent-soft: #303c60;
  --bs-body-color: #edf0f6;
  --bs-body-bg: #202630;
  --bs-secondary-color: #aab4c5;
}

[hidden] {
  display: none !important;
}
body {
  margin: 0;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: system-ui, sans-serif;
  line-height: 1.6;
}
button,
input,
select,
textarea {
  font: inherit;
}
button,
a,
summary {
  -webkit-tap-highlight-color: transparent;
}
button:focus-visible,
summary:focus-visible,
a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}
button:disabled {
  cursor: not-allowed;
}
h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--text-primary);
  letter-spacing: -0.035em;
}
.app-shell {
  max-width: 1160px;
  padding: 44px 24px 24px;
}
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 32px;
}
.app-header h1 {
  font-size: 2rem;
  font-weight: 720;
  margin: 4px 0 6px;
}
.title-dot {
  color: var(--accent);
}
.eyebrow,
.section-label {
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  color: var(--text-secondary);
}
.section-label {
  display: block;
  margin-bottom: 12px;
}
.muted-small {
  font-size: 0.84rem;
  color: var(--text-secondary);
}
.main-nav {
  display: flex;
  gap: 24px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 28px;
  overflow-x: auto;
}
.main-nav button {
  flex: 0 0 auto;
  padding: 12px 0;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.main-nav button.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 650;
}
.tab-pane {
  display: none;
}
.tab-pane.active {
  display: block;
}
.workspace {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: 14px;
  box-shadow: 0 3px 12px #18264003;
  min-width: 0;
}
.setup-panel {
  padding: 24px;
}
.test-panel {
  padding: 30px;
  min-height: 480px;
}
.test-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}
.status-badge {
  border-radius: 6px;
  padding: 3px 9px;
  color: var(--accent);
  background: var(--accent-soft);
  font-size: 0.75rem;
  font-weight: 600;
}
.timer {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}
.timer.urgent {
  color: #dc3545;
  font-weight: 700;
}
.question-area {
  min-height: 190px;
  padding-top: 14px;
}
.question-prompt {
  font-size: 1.1rem;
  white-space: pre-wrap;
  margin-bottom: 24px;
  overflow-wrap: anywhere;
}
.choice-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 16px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 10px;
  cursor: pointer;
}
.choice-row:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.choice-row input {
  margin-top: 6px;
  accent-color: var(--accent);
  flex-shrink: 0;
}
.choice-row span {
  overflow-wrap: anywhere;
  min-width: 0;
}
.question-image {
  display: block;
  max-width: 100%;
  max-height: 300px;
  object-fit: contain;
  margin-bottom: 20px;
}
.choice-image {
  max-width: 150px;
  max-height: 150px;
  display: block;
  object-fit: contain;
}
.form-control,
.form-select {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-color);
}
.form-control:focus,
.form-select:focus {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-control::placeholder {
  color: var(--text-secondary);
  opacity: 0.8;
}
.form-control:disabled {
  background: var(--bg-primary);
  color: var(--text-secondary);
}
textarea {
  resize: vertical;
}
.btn {
  border-radius: 7px;
  font-size: 0.88rem;
  padding: 9px 15px;
  font-weight: 550;
}
.btn-sm {
  font-size: 0.8rem;
  padding: 6px 10px;
}
.btn-primary {
  --bs-btn-bg: #435ac7;
  --bs-btn-border-color: #435ac7;
  --bs-btn-hover-bg: #344aaf;
  --bs-btn-hover-border-color: #344aaf;
  --bs-btn-disabled-bg: #435ac7;
  --bs-btn-disabled-border-color: #435ac7;
}
.btn-link {
  color: var(--accent);
  text-decoration: none;
  padding-left: 0;
  padding-right: 0;
}
.btn-outline-primary {
  color: var(--accent);
  border-color: var(--accent);
}
.btn-outline-secondary {
  color: var(--text-secondary);
  border-color: var(--border-color);
}
.check-row {
  display: flex;
  gap: 9px;
  align-items: flex-start;
  margin-bottom: 10px;
  font-size: 0.82rem;
}
.check-row input {
  margin-top: 6px;
  accent-color: var(--accent);
}
details {
  min-width: 0;
}
summary {
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 550;
}
details[open] > summary {
  color: var(--text-primary);
}
.stack-actions {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}
hr {
  border-color: var(--border-color);
  opacity: 1;
  margin: 23px 0;
}
.action-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.test-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
  margin-top: 24px;
  flex-wrap: wrap;
}
.question-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 7px;
}
.q-index {
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  min-height: 36px;
}
.q-index.answered {
  background: var(--accent-soft);
  color: var(--accent);
}
.q-index.current {
  border: 2px solid var(--accent);
  color: var(--accent);
  font-weight: 700;
}
.progress-track {
  height: 4px;
  background: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
}
#progressBar {
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 0.2s;
}
.pause-message {
  padding: 60px 0 40px;
  text-align: center;
}
.order-list {
  padding: 0;
  list-style: none;
}
.order-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  margin-bottom: 8px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-secondary);
}
.order-text {
  flex: 1;
  overflow-wrap: anywhere;
}
.order-controls {
  display: flex;
  gap: 4px;
}
.order-controls button {
  padding: 3px 9px;
}
.match-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
  overflow-wrap: anywhere;
}
.blank-input {
  display: inline-block;
  width: 160px;
  max-width: 100%;
  margin: 6px;
}
.page-heading {
  margin: 36px 0 24px;
}
.page-heading h2 {
  font-size: 1.5rem;
}
.collection {
  display: grid;
  gap: 14px;
}
.entry-card {
  padding: 22px 24px;
}
.entry-card h3 {
  font-size: 1.05rem;
  margin-bottom: 5px;
  overflow-wrap: anywhere;
}
.entry-actions {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}
.entry-advanced {
  margin-top: 14px;
}
.empty-state {
  padding: 45px 24px;
  text-align: center;
  color: var(--text-secondary);
  border: 1px dashed var(--border-color);
  border-radius: 12px;
}
.notice {
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent);
  background: var(--bg-secondary);
  padding: 12px 16px;
  border-radius: 7px;
  margin-bottom: 22px;
  font-size: 0.88rem;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.notice.error {
  border-left-color: #dc3545;
}
.result-score {
  font-size: 2rem;
  font-weight: 700;
}
.result-answer {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  padding: 12px;
  border-radius: 7px;
  background: var(--bg-primary);
  font-size: 0.9rem;
}
.result-label {
  font-size: 0.8rem;
  font-weight: 650;
}
.result-correct {
  color: #238154;
}
.result-incorrect {
  color: #c2414e;
}
.result-pending,
.result-partial {
  color: #996400;
}
body.dark-mode .result-correct {
  color: #72dca5;
}
body.dark-mode .result-incorrect {
  color: #ff9ca8;
}
body.dark-mode .result-pending,
body.dark-mode .result-partial {
  color: #f2cd7d;
}
.manual-score {
  width: 105px;
}
.grade-summary {
  font-size: 0.85rem;
}
footer {
  padding: 32px 0 0;
  margin-top: 32px;
  border-top: 1px solid var(--border-color);
}
pre {
  white-space: pre;
  font-size: 0.8rem;
  max-width: 100%;
}
dialog {
  width: min(900px, calc(100% - 24px));
  max-height: calc(100dvh - 32px);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 24px;
}
dialog::backdrop {
  background: #10182899;
}
dialog textarea {
  font-family: ui-monospace, monospace;
  font-size: 0.83rem;
}
@media (max-width: 850px) {
  .workspace {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 16px;
  }
  .setup-panel,
  .test-panel {
    padding: 20px;
  }
}
@media (max-width: 680px) {
  .app-shell {
    padding: 24px 16px;
  }
  .app-header {
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 22px;
  }
  .app-header h1 {
    font-size: 1.7rem;
  }
  .app-header .muted-small {
    max-width: 230px;
  }
  .app-header > button {
    flex-shrink: 0;
  }
  .eyebrow {
    font-size: 0.58rem;
  }
  .main-nav {
    gap: 22px;
    margin-bottom: 18px;
  }
  .workspace {
    display: flex;
    flex-direction: column;
  }
  .setup-panel,
  .test-panel {
    width: 100%;
  }
  .test-panel {
    min-height: 380px;
  }
  .question-area {
    min-height: 150px;
  }
  .match-row {
    grid-template-columns: 1fr;
    gap: 5px;
  }
  .entry-card {
    padding: 18px;
  }
  .question-grid {
    grid-template-columns: repeat(auto-fill, minmax(34px, 1fr));
  }
  .app-header .btn {
    padding: 6px 8px;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}