:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-2: #eef2f6;
  --text: #17202a;
  --muted: #66717f;
  --line: #d8e0e8;
  --primary: #126a72;
  --primary-dark: #0d5157;
  --danger: #a63a3a;
  --danger-bg: #ffe9e8;
  --success: #217346;
  --success-bg: #e5f5ec;
  --wrong-bg: #fae8e8;
  --focus: #f2b84b;
  font-family: Arial, Helvetica, sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #141a20;
  --surface: #1d252e;
  --surface-2: #293440;
  --text: #edf2f6;
  --muted: #aebbc7;
  --line: #3c4a57;
  --primary: #3eafb6;
  --primary-dark: #27858c;
  --danger: #f08080;
  --danger-bg: #48282c;
  --success: #54bc7e;
  --success-bg: #1d3c2d;
  --wrong-bg: #48282c;
  --focus: #ffd166;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1000;
  pointer-events: none;
  opacity: 0;
}

body.answer-feedback-correct::before {
  animation: answer-feedback-correct 420ms ease-out;
}

body.answer-feedback-wrong::before {
  animation: answer-feedback-wrong 420ms ease-out;
}

@keyframes answer-feedback-correct {
  0% {
    opacity: 0;
    background: transparent;
  }

  24% {
    opacity: 1;
    background: rgba(33, 115, 70, 0.2);
  }

  100% {
    opacity: 0;
    background: rgba(33, 115, 70, 0);
  }
}

@keyframes answer-feedback-wrong {
  0% {
    opacity: 0;
    background: transparent;
  }

  24% {
    opacity: 1;
    background: rgba(166, 58, 58, 0.22);
  }

  100% {
    opacity: 0;
    background: rgba(166, 58, 58, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  body.answer-feedback-correct::before,
  body.answer-feedback-wrong::before {
    animation: none;
  }
}

button {
  font: inherit;
}

.app-shell {
  width: min(1120px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 24px 0 40px;
}

.topbar,
.quiz-header,
.review-header,
.search-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.account-status {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}

.auth-view {
  display: grid;
  place-items: start center;
}

.auth-card {
  width: min(100%, 480px);
  display: grid;
  gap: 14px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}

.auth-hero {
  display: grid;
  gap: 7px;
  padding: 16px;
  border-radius: 8px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--primary) 14%, var(--surface)), var(--surface-2));
}

.auth-hero h1 {
  font-size: clamp(28px, 6vw, 38px);
}

.auth-hero p:last-child {
  color: var(--muted);
  line-height: 1.45;
}

.auth-intro,
.auth-guest-note,
.auth-form small,
.auth-message {
  color: var(--muted);
}

.user-count {
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
  font-weight: 700;
}

.auth-form {
  display: grid;
  gap: 12px;
}

.auth-form label {
  display: grid;
  gap: 6px;
  font-weight: 700;
}

.auth-form input {
  min-height: 42px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
}

.password-field {
  position: relative;
  display: block;
}

.password-field input {
  width: 100%;
  padding-right: 46px;
}

.password-toggle {
  position: absolute;
  top: 50%;
  right: 4px;
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  padding: 0;
  transform: translateY(-50%);
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
}

.password-toggle:hover {
  color: var(--text);
  background: var(--surface-2);
}

.password-toggle:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 1px;
}

.password-toggle svg {
  width: 19px;
  height: 19px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.auth-choice-panel {
  display: grid;
  gap: 12px;
}

.auth-choice-actions {
  display: grid;
  gap: 9px;
}

.auth-choice-actions button {
  width: 100%;
  min-height: 44px;
}

.auth-back-button {
  justify-self: start;
  padding: 4px 0;
  border: 0;
  color: var(--muted);
  background: transparent;
  font: inherit;
  font-weight: 700;
}

.auth-back-button:hover {
  color: var(--text);
  text-decoration: underline;
}

.auth-back-button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.auth-message:not(:empty) {
  color: var(--danger);
  font-weight: 700;
}

.account-required-note {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.account-restricted {
  opacity: 0.56;
}

.account-restricted button {
  cursor: not-allowed;
}

.review-header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-field {
  display: grid;
  gap: 8px;
  margin-bottom: 12px;
  color: var(--muted);
  font-weight: 700;
}

.search-field input {
  min-height: 46px;
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
}

.search-field input:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: 28px;
  line-height: 1.1;
}

h2 {
  font-size: 24px;
  line-height: 1.2;
}

h3 {
  font-size: 18px;
  line-height: 1.35;
}

.data-status,
.section-heading p,
.eyebrow,
.question-meta {
  color: var(--muted);
}

.data-status {
  margin-top: 6px;
}

.view {
  display: block;
}

.hidden {
  display: none;
}

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

code {
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 2px 6px;
}

.mode-grid {
  display: grid;
  grid-template-columns: minmax(240px, 320px) 1fr;
  gap: 18px;
  align-items: stretch;
}

.practice-column {
  display: grid;
  gap: 18px;
}

.exam-mode-column {
  display: grid;
  gap: 12px;
}

.coverage-tests-panel {
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.coverage-tests-panel .range-selection-status {
  margin-top: 6px;
}

.coverage-test-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 6px;
  margin-top: 12px;
}

.coverage-tests-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 12px;
}

.coverage-test-button {
  position: relative;
  min-height: 34px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-2);
  color: var(--text);
  cursor: pointer;
}

.coverage-test-button:hover {
  border-color: var(--primary);
}

.coverage-test-button.passed-coverage-test {
  background: var(--success-bg);
  border-color: var(--success);
  color: var(--success);
  font-weight: 700;
}

.coverage-test-button.has-wrong-question {
  background: var(--danger-bg);
  border-color: var(--danger);
  color: var(--danger);
  font-weight: 700;
}

.coverage-test-button.has-wrong-question::after {
  content: attr(data-wrong-count);
  position: absolute;
  top: 2px;
  right: 4px;
  color: var(--danger);
  font-size: 10px;
  font-weight: 700;
}

.mode-button,
.range-button,
.category-button,
.primary-button,
.secondary-button,
.danger-button,
.answer-button {
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease, transform 120ms ease;
}

.mode-button:focus-visible,
.range-button:focus-visible,
.category-button:focus-visible,
.segment-button:focus-visible,
.primary-button:focus-visible,
.secondary-button:focus-visible,
.danger-button:focus-visible,
.answer-button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.primary-mode {
  min-height: 190px;
  padding: 22px;
  background: var(--primary);
  color: white;
  text-align: left;
}

.primary-mode span {
  display: block;
  margin-bottom: 10px;
  font-size: 17px;
}

.primary-mode strong {
  display: block;
  font-size: 34px;
  line-height: 1.1;
}

.exam-blueprint {
  display: block;
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.45;
  color: rgba(255, 255, 255, 0.86);
}

.range-panel,
.question-surface,
.review-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.range-panel {
  padding: 18px;
}

.range-order-control {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
  color: var(--muted);
}

.review-filter-control {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

.segmented-control {
  display: inline-grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
}

.segment-button {
  min-height: 38px;
  padding: 0 14px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  cursor: pointer;
}

.segment-button:last-child {
  border-right: 0;
}

.segment-button.active {
  background: var(--primary);
  color: white;
}

.range-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.range-button,
.category-button {
  min-height: 48px;
  padding: 8px 10px;
  background: var(--surface-2);
  color: var(--text);
}

.category-button {
  line-height: 1.25;
  text-align: left;
}

.range-button.selected,
.category-button.selected {
  border-color: var(--primary);
  background: color-mix(in srgb, var(--primary) 20%, var(--surface));
  color: var(--primary-dark);
  font-weight: 700;
}

.range-button:hover,
.category-button:hover,
.secondary-button:hover {
  border-color: var(--primary);
}

.range-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
}

.range-actions-clear {
  justify-content: flex-end;
  margin-top: 10px;
}

.range-selection-status {
  color: var(--muted);
}

.primary-button,
.secondary-button,
.danger-button {
  min-height: 42px;
  padding: 0 16px;
  white-space: nowrap;
}

.primary-button {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

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

.secondary-button {
  background: var(--surface);
  color: var(--text);
}

.danger-button {
  background: var(--surface);
  border-color: color-mix(in srgb, var(--danger) 45%, var(--line));
  color: var(--danger);
}

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

.danger-button.confirming {
  background: var(--danger);
  border-color: var(--danger);
  color: white;
  font-weight: 700;
}

.primary-button:disabled,
.secondary-button:disabled,
.danger-button:disabled,
.mode-button:disabled,
.range-button:disabled,
.category-button:disabled,
.segment-button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

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

.score-status {
  min-width: 180px;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  text-align: right;
  font-weight: 700;
}

.quiz-status-stack {
  display: grid;
  justify-items: end;
  gap: 8px;
}

.pool-progress-status {
  max-width: 280px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  text-align: right;
}

.pool-progress-status.complete {
  border-color: color-mix(in srgb, var(--success) 65%, var(--line));
  background: var(--success-bg);
  color: var(--success);
}

.question-surface {
  padding: 22px;
}

.question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
  font-size: 14px;
}

#questionText {
  font-size: 22px;
  margin-bottom: 18px;
}

.question-images {
  display: grid;
  gap: 10px;
  margin-bottom: 18px;
}

.question-images.hidden {
  display: none;
}

.question-images img {
  display: block;
  max-width: 100%;
  max-height: 420px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.review-question-images {
  margin-top: 10px;
  margin-bottom: 12px;
}

.review-question-images img {
  max-height: 260px;
}

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

.question-tools {
  display: flex;
  justify-content: flex-end;
  margin-top: 14px;
}

.answer-button {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 12px;
  align-items: start;
  width: 100%;
  min-height: 58px;
  padding: 14px;
  background: var(--surface-2);
  color: var(--text);
  text-align: left;
}

.answer-label {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: var(--surface-2);
  font-weight: 700;
}

.answer-button.correct {
  border-color: color-mix(in srgb, var(--success) 65%, var(--line));
  background: var(--success-bg);
}

.answer-button.correct .answer-label {
  background: var(--success);
  color: white;
}

.answer-button.wrong {
  border-color: color-mix(in srgb, var(--danger) 65%, var(--line));
  background: var(--wrong-bg);
}

.answer-button.wrong .answer-label {
  background: var(--danger);
  color: white;
}

.answer-button:disabled {
  cursor: default;
  opacity: 1;
}

.quiz-actions,
.review-actions {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 18px;
}

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

.review-item {
  padding: 16px;
}

.review-empty {
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
}

.review-question {
  margin: 8px 0 12px;
  font-weight: 700;
}

.review-answers {
  display: grid;
  gap: 8px;
}

.review-answer {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  background: var(--surface-2);
}

.review-answer.correct {
  border-color: color-mix(in srgb, var(--success) 65%, var(--line));
  background: var(--success-bg);
}

.review-answer.wrong {
  border-color: color-mix(in srgb, var(--danger) 65%, var(--line));
  background: var(--wrong-bg);
}

.review-note {
  margin-top: 10px;
  color: var(--muted);
}

@media (max-width: 760px) {
  .app-shell {
    width: min(100vw - 20px, 1120px);
    padding-top: 14px;
  }

  .topbar,
  .quiz-header,
  .review-header,
  .search-header,
  .topbar-actions,
  .section-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .quiz-actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: stretch;
    gap: 8px;
  }

  .quiz-actions button {
    min-width: 0;
    padding-left: 10px;
    padding-right: 10px;
    white-space: normal;
  }

  .review-header-actions,
  .review-filter-control {
    align-items: stretch;
    flex-direction: column;
  }

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

  .range-order-control {
    align-items: stretch;
    flex-direction: column;
  }

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

  .score-status {
    text-align: left;
  }

  .quiz-status-stack {
    justify-items: stretch;
  }

  .pool-progress-status {
    max-width: none;
    text-align: left;
  }

  .primary-mode {
    min-height: 130px;
  }

  #questionText {
    font-size: 19px;
  }
}