:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --panel: #ffffff;
  --text: #18212f;
  --muted: #667085;
  --line: #d9e0e8;
  --accent: #0f766e;
  --accent-dark: #115e59;
  --danger: #b42318;
  --success: #067647;
}

* {
  box-sizing: border-box;
}

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

.shell {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 48px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.brand {
  align-items: center;
  color: var(--text);
  display: flex;
  gap: 18px;
  font-size: 22px;
  font-weight: 650;
  line-height: 1.18;
  text-decoration: none;
}

.brand img {
  display: block;
  height: 74px;
  object-fit: contain;
  width: auto;
}

.score {
  align-items: flex-end;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  font-size: 13px;
  line-height: 1.2;
  text-align: right;
}

.score strong {
  color: var(--accent);
  font-size: 24px;
  line-height: 1;
}

.top-actions {
  align-items: center;
  display: flex;
  gap: 8px;
}

.top-actions form {
  margin: 0;
}

.topbar .button,
.top-actions button {
  margin-top: 0;
}

.course-tabs {
  background: #e8eef4;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
  margin-bottom: 16px;
  padding: 4px;
}

.course-tab {
  align-items: center;
  border-radius: 6px;
  color: var(--muted);
  display: inline-flex;
  font-weight: 750;
  justify-content: center;
  min-height: 40px;
  padding: 8px 12px;
  text-align: center;
  text-decoration: none;
}

.course-tab.active {
  background: var(--panel);
  color: var(--text);
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.08);
}

.toolbar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.filter,
.button,
button {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 9px 13px;
  text-decoration: none;
  font: inherit;
  font-weight: 650;
}

.filter span {
  color: var(--muted);
  font-weight: 600;
}

.filter.active {
  border-color: var(--accent);
  color: var(--accent);
}

.question-panel,
.result,
.start-panel,
.admin-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 28px;
}

.admin-panel.narrow {
  max-width: 480px;
  margin: 0 auto;
}

.start-panel {
  padding: 34px;
}

.start-panel h1 {
  margin-bottom: 22px;
}

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

.course-choice {
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  display: grid;
  gap: 8px;
  min-height: 132px;
  padding: 22px;
  text-decoration: none;
}

.course-choice:hover {
  border-color: var(--accent);
}

.course-choice-title {
  font-size: 22px;
  font-weight: 800;
  line-height: 1.2;
}

.course-choice-count {
  color: var(--muted);
  font-weight: 650;
}

.admin-heading {
  align-items: center;
  display: flex;
  gap: 16px;
  justify-content: space-between;
  margin-bottom: 18px;
}

.admin-heading h1 {
  margin: 0;
}

.admin-heading-actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.admin-form {
  display: grid;
  gap: 16px;
}

.admin-form label {
  display: grid;
  gap: 7px;
  font-weight: 700;
}

.admin-form input[type="text"],
.admin-form input[type="password"],
.admin-form select,
.admin-form textarea {
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  font: inherit;
  padding: 10px 12px;
  width: 100%;
}

.admin-form textarea {
  resize: vertical;
}

.access-code-form {
  align-items: end;
  border-bottom: 1px solid var(--line);
  grid-template-columns: minmax(180px, 1fr) minmax(180px, 1fr) auto;
  margin-bottom: 18px;
  padding-bottom: 18px;
}

.answer-editor {
  display: grid;
  gap: 12px;
}

.correct-options {
  border: 1px solid var(--line);
  border-radius: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
  padding: 14px;
}

.correct-options legend {
  font-weight: 800;
  padding: 0 6px;
}

.correct-options label {
  align-items: center;
  display: inline-flex;
  gap: 6px;
}

.image-editor {
  display: grid;
  gap: 10px;
}

.inline-check {
  align-items: center;
  display: inline-flex;
  gap: 8px;
  font-weight: 700;
}

.form-images {
  grid-column: auto;
}

.form-error {
  background: #fef3f2;
  border: 1px solid #fecdca;
  border-radius: 8px;
  color: var(--danger);
  font-weight: 700;
  margin: 0 0 16px;
  padding: 10px 12px;
}

.generated-code {
  background: #ecfdf3;
  border: 1px solid #abefc6;
  border-radius: 8px;
  display: grid;
  gap: 4px;
  margin: 0 0 16px;
  padding: 14px;
}

.generated-code span {
  color: var(--muted);
  font-weight: 700;
}

.generated-code strong {
  color: var(--success);
  font-size: 28px;
  letter-spacing: 0.08em;
}

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

.access-code-row {
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 10px;
  grid-template-columns: minmax(150px, 1fr) minmax(160px, 1fr) auto auto auto;
  padding: 14px;
}

.access-code-actions {
  align-items: center;
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.access-code-actions form {
  margin: 0;
}

.access-code-actions .button,
.access-code-actions button {
  margin-top: 0;
}

.access-code-row strong {
  letter-spacing: 0.06em;
}

.access-code-row.expired {
  color: var(--muted);
}

.delete-form {
  border-top: 1px solid var(--line);
  margin-top: 22px;
  padding-top: 18px;
}

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

.danger-button:hover {
  background: #912018;
}

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

.question-row {
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 8px;
  grid-template-columns: auto 1fr auto;
  padding: 14px;
}

.question-row .meta,
.question-row p,
.admin-question-images {
  grid-column: 2;
}

.question-row-actions {
  align-self: start;
  display: flex;
  gap: 8px;
  grid-column: 3;
  grid-row: 1 / span 3;
  justify-content: flex-end;
}

.question-index {
  align-items: center;
  background: #e8eef4;
  border-radius: 6px;
  display: inline-flex;
  font-weight: 800;
  grid-row: 1 / span 2;
  justify-content: center;
  min-height: 32px;
  min-width: 40px;
  padding: 0 8px;
}

.question-row p {
  margin: 0;
}

.question-row-actions .button {
  min-height: 34px;
  padding: 6px 10px;
}

.admin-question-images {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.admin-question-images img {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 6px;
  max-height: 120px;
  max-width: min(100%, 180px);
  object-fit: contain;
  padding: 6px;
}

.meta {
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  font-size: 14px;
  margin-bottom: 10px;
}

h1 {
  font-size: clamp(24px, 3vw, 34px);
  letter-spacing: 0;
  line-height: 1.2;
  margin: 0 0 24px;
}

.question-images {
  align-items: flex-start;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: -6px 0 24px;
}

.question-images img {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  max-height: 220px;
  max-width: min(100%, 340px);
  object-fit: contain;
  padding: 8px;
}

.answers {
  display: grid;
  gap: 12px;
}

.answer {
  align-items: flex-start;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  grid-template-columns: auto auto 1fr;
  gap: 12px;
  padding: 14px;
}

label.answer {
  cursor: pointer;
}

.answer input {
  inline-size: 20px;
  block-size: 20px;
  margin: 2px 0 0;
}

.letter {
  align-items: center;
  background: #e8eef4;
  border-radius: 6px;
  display: inline-flex;
  font-weight: 800;
  justify-content: center;
  min-width: 32px;
  min-height: 32px;
}

button,
.button {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
  justify-content: center;
  margin-top: 8px;
}

.button.secondary,
button.secondary {
  background: var(--panel);
  border-color: var(--line);
  color: var(--text);
}

.button.secondary:hover,
button.secondary:hover {
  background: #e8eef4;
}

button:hover,
.button:hover {
  background: var(--accent-dark);
}

.verdict {
  font-size: 16px;
  font-weight: 800;
  margin: 0 0 10px;
}

.scoreline {
  color: var(--muted);
  font-weight: 650;
  margin: -4px 0 18px;
}

.result.ok .verdict {
  color: var(--success);
}

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

.reviewed .answer.correct {
  border-color: var(--success);
  background: #ecfdf3;
}

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

.reviewed .answer.selected:not(.correct) {
  border-color: var(--danger);
  background: #fef3f2;
}

.actions {
  margin-top: 20px;
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 20px, 960px);
    padding-top: 14px;
  }

  .question-panel,
  .result,
  .start-panel,
  .admin-panel {
    padding: 18px;
  }

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

  .brand {
    gap: 12px;
    font-size: 18px;
  }

  .brand img {
    height: 58px;
  }

  .score {
    align-items: flex-start;
    text-align: left;
  }

  .top-actions,
  .admin-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .admin-heading-actions,
  .access-code-form,
  .access-code-row {
    grid-template-columns: 1fr;
  }

  .admin-heading-actions {
    align-items: stretch;
    flex-direction: column;
  }

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

  .course-choice-grid {
    grid-template-columns: 1fr;
  }
}