:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #edf2f4;
  --text: #172026;
  --muted: #5d6975;
  --line: #d7dde3;
  --primary: #146c94;
  --primary-dark: #0d4d68;
  --accent: #7b5e2b;
  --success: #1b7f4c;
  --success-bg: #e8f6ee;
  --danger: #b42318;
  --danger-bg: #fff0ed;
  --warning: #9a6700;
  --warning-bg: #fff7d6;
  --focus: #ffbf47;
  --radius: 8px;
  --shadow: 0 12px 32px rgba(23, 32, 38, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  min-height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.topbar__inner {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.brand__mark {
  inline-size: 38px;
  block-size: 38px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  direction: ltr;
}

.topbar__meta {
  display: flex;
  gap: 10px;
  align-items: center;
  color: var(--muted);
  font-size: 0.94rem;
}

.page {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 96px;
}

.start-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 24px;
  align-items: start;
}

.intro,
.setup,
.panel,
.question-panel,
.results-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.intro,
.setup,
.panel,
.results-panel {
  padding: 24px;
}

.intro h1,
.results-panel h1 {
  margin: 0 0 10px;
  font-size: clamp(1.65rem, 4vw, 2.5rem);
  line-height: 1.3;
}

.intro p,
.setup p,
.muted {
  color: var(--muted);
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.admin-summary {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  max-width: 760px;
}

.stat {
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
}

.stat strong {
  display: block;
  font-size: 1.35rem;
  line-height: 1.2;
}

.stat span {
  color: var(--muted);
  font-size: 0.9rem;
}

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

.field {
  display: grid;
  gap: 7px;
}

.field label {
  font-weight: 700;
}

.field select {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--text);
  padding: 8px 12px;
}

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

.segment {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--text);
  padding: 8px 12px;
}

.segment[aria-pressed="true"] {
  border-color: var(--primary);
  background: #e9f5fb;
  color: var(--primary-dark);
  font-weight: 800;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.button {
  min-height: 44px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 9px 15px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
}

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

.button--secondary {
  background: var(--accent);
}

.button--secondary:hover {
  background: #5d451f;
}

.button--ghost {
  background: #fff;
  color: var(--text);
  border-color: var(--line);
}

.button--ghost:hover {
  background: var(--surface-2);
}

.button--danger {
  background: var(--danger);
}

.button--danger:hover {
  background: #871c14;
}

.button--small {
  min-height: 34px;
  padding: 5px 10px;
  font-size: 0.9rem;
}

.button:disabled,
.button[disabled] {
  cursor: not-allowed;
  opacity: 0.55;
}

.file-button {
  position: relative;
  overflow: hidden;
}

.file-button input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.visually-hidden-file {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  clip-path: inset(50%);
}

.upload-button {
  width: fit-content;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--text);
  padding: 9px 14px;
  font-weight: 800;
  cursor: pointer;
}

.upload-button:hover {
  background: var(--surface-2);
}

.field textarea,
.field input[type="file"] {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--text);
  padding: 10px 12px;
}

.field textarea {
  resize: vertical;
}

.builder-form {
  display: grid;
  gap: 18px;
}

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

.choice-editor {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  background: #fff;
}

.choice-editor h2 {
  margin: 0 0 12px;
  font-size: 1rem;
}

.upload-status {
  color: var(--muted);
  font-size: 0.92rem;
}

.uploaded-image,
.manual-question .question-image,
.choice__text .choice-image {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  margin-top: 8px;
}

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

.manual-question .question-image {
  max-height: 420px;
  object-fit: contain;
  margin-inline-start: auto;
}

.choice__text .choice-image {
  max-height: 180px;
  object-fit: contain;
  margin-inline-start: auto;
}

.choice-text {
  display: block;
  margin-bottom: 6px;
}

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

.list-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: #fff;
}

.list-item p {
  margin: 4px 0 0;
  color: var(--muted);
  overflow-wrap: anywhere;
}

.exam-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 18px;
  align-items: start;
}

.exam-main {
  display: grid;
  gap: 16px;
}

.progress {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
}

.progress__line {
  block-size: 10px;
  border-radius: 999px;
  background: var(--surface-2);
  overflow: hidden;
}

.progress__bar {
  block-size: 100%;
  background: var(--primary);
  width: 0;
}

.progress__meta {
  margin-top: 10px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.94rem;
}

.question-panel {
  padding: 0;
  overflow: hidden;
}

.question-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  border-bottom: 1px solid var(--line);
  padding: 16px 18px;
}

.question-header h1 {
  margin: 0;
  font-size: 1.25rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 0.84rem;
  font-weight: 800;
  white-space: nowrap;
}

.badge--warning {
  background: var(--warning-bg);
  color: var(--warning);
}

.badge--success {
  background: var(--success-bg);
  color: var(--success);
}

.badge--muted {
  background: var(--surface-2);
  color: var(--muted);
}

.question-body {
  padding: 20px 18px 8px;
}

.prompt {
  font-size: 1.14rem;
  font-weight: 700;
  margin-bottom: 16px;
  white-space: pre-wrap;
}

.source-doc {
  direction: rtl;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 14px;
  overflow-x: auto;
}

.source-doc p {
  margin: 0 0 8px;
  font-size: 1.03rem;
  line-height: 1.8;
  white-space: normal;
}

.source-doc p:last-child {
  margin-bottom: 0;
}

.source-doc sup,
.source-doc sub {
  line-height: 0;
}

.source-doc table {
  border-collapse: collapse;
  max-width: 100%;
}

.source-doc td,
.source-doc th {
  border: 1px solid var(--line);
  padding: 6px;
}

.question-image-wrap {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
  overflow-x: auto;
  margin-bottom: 14px;
}

.question-image,
.choice-image {
  display: block;
  max-width: 100%;
  height: auto;
}

.question-image {
  margin-inline-start: auto;
}

.choice-image {
  margin-inline-start: auto;
  max-height: 220px;
  object-fit: contain;
}

.mathish {
  direction: ltr;
  unicode-bidi: isolate;
  display: inline-block;
}

.choices {
  display: grid;
  gap: 10px;
  padding: 0 18px 18px;
}

.choice {
  width: 100%;
  min-height: 54px;
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  align-items: center;
  text-align: start;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--text);
  padding: 10px 12px;
}

.choice:hover {
  border-color: var(--primary);
  background: #f3fbff;
}

.choice[aria-pressed="true"] {
  border-color: var(--primary);
  background: #e9f5fb;
  box-shadow: inset 4px 0 0 var(--primary);
}

.choice__key {
  direction: ltr;
  inline-size: 36px;
  block-size: 36px;
  border-radius: 50%;
  background: var(--surface-2);
  display: grid;
  place-items: center;
  font-weight: 900;
}

.choice[aria-pressed="true"] .choice__key {
  background: var(--primary);
  color: #fff;
}

.choice__text {
  overflow-wrap: anywhere;
  min-width: 0;
}

.question-actions {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 18px 18px;
  border-top: 1px solid var(--line);
}

.side {
  position: sticky;
  top: 82px;
  display: grid;
  gap: 14px;
}

.side h2 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

.question-map {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 7px;
  max-height: 440px;
  overflow: auto;
  padding-inline-end: 2px;
}

.map-button {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
  font-size: 0.86rem;
}

.map-button.is-current {
  border-color: var(--primary);
  box-shadow: inset 0 0 0 2px var(--primary);
  font-weight: 900;
}

.map-button.is-answered {
  background: var(--success-bg);
  border-color: #8fd5ae;
  color: var(--success);
}

.map-button.is-review {
  border-style: dashed;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 20px 0;
}

.summary-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 15px;
  background: var(--surface-2);
}

.summary-card strong {
  display: block;
  font-size: 1.55rem;
  line-height: 1.2;
}

.review-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0;
}

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

.review-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 14px;
}

.review-item.is-correct {
  border-color: #8fd5ae;
}

.review-item.is-wrong {
  border-color: #f3aaa3;
}

.review-item h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.review-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.long-answer {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.long-answer summary {
  cursor: pointer;
  padding: 10px 12px;
  font-weight: 800;
}

.long-answer__body {
  border-top: 1px solid var(--line);
  padding: 12px;
  background: #fff;
  white-space: normal;
}

.long-answer-image {
  display: block;
  max-inline-size: 100%;
  max-block-size: 720px;
  object-fit: contain;
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.notice {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 14px;
  background: var(--warning-bg);
  color: #5f4300;
}

.dialog {
  border: 0;
  padding: 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  max-inline-size: min(520px, calc(100vw - 28px));
}

.dialog::backdrop {
  background: rgba(0, 0, 0, 0.35);
}

.dialog__content {
  padding: 22px;
}

.dialog__content h2 {
  margin-top: 0;
}

.dialog__actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-start;
}

.hidden {
  display: none !important;
}

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

  .side {
    position: static;
  }

  .question-map {
    grid-template-columns: repeat(8, 1fr);
    max-height: 220px;
  }

  .summary-grid,
  .stats,
  .choice-editor-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .topbar__inner,
  .page {
    width: min(100% - 20px, 1180px);
  }

  .topbar__inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 10px 0;
  }

  .topbar__meta {
    flex-wrap: wrap;
  }

  .intro,
  .setup,
  .panel,
  .results-panel {
    padding: 16px;
  }

  .segmented,
  .summary-grid,
  .stats,
  .choice-editor-grid,
  .list-item {
    grid-template-columns: 1fr;
  }

  .question-header,
  .question-actions,
  .progress__meta {
    flex-direction: column;
    align-items: stretch;
  }

  .choice {
    grid-template-columns: 38px 1fr;
  }

  .question-map {
    grid-template-columns: repeat(5, 1fr);
  }
}