:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --text: #1a2332;
  --muted: #5c6b7a;
  --accent: #0b5fff;
  --accent-dark: #0847c7;
  --ok: #0d7a3f;
  --ok-bg: #e8f5ee;
  --bad: #b42318;
  --bad-bg: #fdecea;
  --border: #d8dee6;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(26, 35, 50, 0.08);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.app-header {
  background: linear-gradient(135deg, #0b5fff 0%, #0847c7 100%);
  color: #fff;
  padding: 1.25rem 1rem 1.5rem;
}

.app-header h1 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
}

.app-header p {
  margin: 0.35rem 0 0;
  opacity: 0.9;
  font-size: 0.95rem;
}

.header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.lang-switch {
  flex-shrink: 0;
  border: 1px solid rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.35rem 0.65rem;
  border-radius: 8px;
  cursor: pointer;
}

.lang-switch:hover {
  background: rgba(255, 255, 255, 0.22);
}

.site-disclaimer {
  margin: 0 0 1rem;
  padding: 0.65rem 0.85rem;
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--muted);
  background: rgba(26, 35, 50, 0.03);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.site-disclaimer p {
  margin: 0;
}

.site-disclaimer p + p {
  margin-top: 0.5rem;
}

.site-footer .site-disclaimer {
  margin-bottom: 0.85rem;
  text-align: left;
}

.container {
  width: min(720px, 100%);
  margin: 0 auto;
  padding: 1rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.topic-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.topic-section {
  list-style: none;
}

.topic-section-title {
  margin: 0 0 0.65rem;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.topic-section-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.catalog-total {
  margin: 0.5rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
  text-align: center;
}

.topic-card-head {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.topic-theme-number {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
}

.topic-card-head h2 {
  margin: 0;
}

.topic-title-de {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--muted);
  line-height: 1.3;
}

.app-header h1 .topic-title-de {
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

.topic-card-desc {
  margin: 0.35rem 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.topic-ru-partial {
  margin: 0.35rem 0 0;
  font-size: 0.78rem;
  color: #9a6700;
}

.topic-card--disabled {
  opacity: 0.72;
  cursor: not-allowed;
  box-shadow: none;
}

.topic-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow);
  color: inherit;
  text-decoration: none;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.topic-card:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  text-decoration: none;
}

.topic-card h2 {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
}

.topic-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.topic-meta {
  margin-top: 0.6rem;
  font-size: 0.85rem;
  color: var(--accent-dark);
  font-weight: 600;
}

.quiz-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem;
  box-shadow: var(--shadow);
}

.progress-bar {
  height: 6px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.progress-bar-mastery {
  margin-bottom: 0.35rem;
}

.progress-bar-session {
  margin-bottom: 0.75rem;
  opacity: 0.85;
}

.progress-bar-overall {
  margin: 0.5rem 0 1.25rem;
  height: 8px;
}

.progress-bar-chapter {
  margin: 0.35rem 0 0;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 0.2s ease;
  display: block;
}

.progress-fill-mastery {
  background: var(--ok);
}

.progress-fill-session {
  background: var(--accent-dark);
}

.quiz-mastery {
  margin-bottom: 0.5rem;
}

.quiz-mastery-label {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.progress-panel .progress-heading {
  margin: 0 0 0.25rem;
  font-size: 1.1rem;
}

.progress-overall-text {
  margin: 0;
  font-weight: 600;
  color: var(--accent-dark);
}

.progress-chapters {
  display: grid;
  gap: 0.85rem;
}

.progress-chapter-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.progress-chapter-title {
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.3;
}

.progress-chapter-count {
  font-size: 0.8rem;
  color: var(--muted);
  flex-shrink: 0;
}

.progress-actions {
  margin-top: 1.25rem;
}

.topic-progress {
  margin-top: 0.65rem;
}

.topic-progress-bar {
  height: 5px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.topic-progress-fill {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--ok);
  transition: width 0.2s ease;
}

.topic-progress-label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 600;
}

.list-question-actions {
  margin-top: 0.75rem;
}

.btn-know {
  font-size: 0.85rem;
  padding: 0.5rem 0.85rem;
}

.list-question--solved {
  border-color: var(--ok);
}

.list-question--solved .list-question-num {
  color: var(--ok);
}

.list-question--wrong {
  border-color: #d4a017;
}

.quiz-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.quiz-meta-end {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.question-status-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  line-height: 1.3;
  white-space: nowrap;
}

.question-status-badge--answered {
  color: #6b5a00;
  background: #fff6d6;
}

.question-status-badge--solved {
  color: var(--ok);
  background: var(--ok-bg);
}

.quiz-card--answered:not(.quiz-card--mastered) {
  border-color: #e8dfc0;
}

.quiz-card--mastered {
  border-color: var(--ok);
  box-shadow: 0 0 0 1px rgba(34, 139, 34, 0.08);
}

.list-question--answered:not(.list-question--solved) {
  border-color: #e8dfc0;
}

.question-text {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 1rem;
}

.question-media-wrap {
  margin: 0 0 1rem;
}

.question-image,
.question-video {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.question-media-wrap .question-image + .question-image {
  margin-top: 0.5rem;
}

.question-video {
  width: 100%;
  background: #000;
}

.question-media-error {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted, #666);
}

.options {
  display: grid;
  gap: 0.5rem;
  margin: 0 0 1rem;
}

.option {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  background: #fafbfc;
  transition: border-color 0.15s, background 0.15s;
}

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

.option input {
  margin-top: 0.2rem;
  flex-shrink: 0;
}

.option > span {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
  min-width: 0;
}

.option > span:has(.de-peek-trigger) {
  pointer-events: none;
}

.option > span:has(.de-peek-trigger) .de-peek-trigger {
  pointer-events: auto;
}

.option-label-line {
  display: block;
  min-width: 0;
}

.option-image {
  display: block;
  max-width: 140px;
  max-height: 140px;
  width: auto;
  height: auto;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.list-option .option-image {
  max-width: 100px;
  max-height: 100px;
}

.option.selected {
  border-color: var(--accent);
  background: #eef4ff;
}

.option.correct {
  border-color: var(--ok);
  background: var(--ok-bg);
}

.option.wrong {
  border-color: var(--bad);
  background: var(--bad-bg);
}

.option.disabled {
  pointer-events: none;
  opacity: 0.95;
}

.answer-text-entry {
  cursor: text;
  flex-direction: column;
  align-items: stretch;
}

.answer-text-input {
  width: 100%;
  font: inherit;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
}

.answer-text-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

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

.answer-text-hint {
  font-size: 0.85rem;
  color: var(--muted, #666);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

#quiz .quiz-card .btn-row {
  margin-top: 1rem;
}

.btn {
  appearance: none;
  border: none;
  border-radius: 10px;
  padding: 0.7rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-dark);
}

.btn-secondary {
  background: #e8ecf2;
  color: var(--text);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.feedback {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  font-size: 0.92rem;
}

.feedback.ok {
  background: var(--ok-bg);
  color: var(--ok);
}

.feedback.bad {
  background: var(--bad-bg);
  color: var(--bad);
}

.feedback.neutral {
  background: #eef4ff;
  color: var(--accent-dark);
}

.feedback p {
  margin: 0.35rem 0 0;
  color: var(--text);
}

.hidden {
  display: none !important;
}

.result-card {
  text-align: center;
  padding: 1.5rem 1rem;
}

.result-card h2 {
  margin: 0 0 0.5rem;
}

.result-score {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0.5rem 0;
}

.mode-tabs {
  display: flex;
  gap: 0.35rem;
  margin-bottom: 1rem;
  padding: 0.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.mode-tab {
  flex: 1;
  appearance: none;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.mode-tab:hover {
  color: var(--text);
  background: #eef4ff;
}

.mode-tab.is-active {
  background: var(--accent);
  color: #fff;
}

.list-toolbar {
  margin-bottom: 0.75rem;
}

.list-search {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-size: 0.95rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
}

.list-search:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.list-count {
  margin: 0.4rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.list-questions {
  display: grid;
  gap: 0.65rem;
}

.list-chapters {
  display: grid;
  gap: 1rem;
}

.list-chapter {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.list-chapter-header {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 0.35rem 0.75rem;
  align-items: center;
  width: 100%;
  padding: 0.85rem 1rem;
  border: none;
  background: linear-gradient(180deg, #f4f7fb 0%, #eef2f7 100%);
  text-align: left;
  cursor: pointer;
  color: inherit;
  font: inherit;
}

.list-chapter-header:hover {
  background: #e8eef6;
}

.list-chapter-title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--accent-dark);
}

.list-chapter-meta {
  font-size: 0.8rem;
  color: var(--muted);
  white-space: nowrap;
}

.list-chapter-toggle {
  font-size: 0.75rem;
  color: var(--muted);
}

.list-chapter-body {
  padding: 0.65rem;
  border-top: 1px solid var(--border);
}

.list-chapter.is-collapsed .list-chapter-body {
  display: none;
}

.list-chapter-questions {
  display: grid;
  gap: 0.65rem;
}

.quiz-chapter-wrap {
  margin-bottom: 0.85rem;
}

.quiz-chapter-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--text);
}

.quiz-chapter-select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
}

.quiz-chapter-select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.list-empty {
  text-align: center;
  color: var(--muted);
  padding: 1.5rem 0;
}

.list-chapter-nav {
  margin-bottom: 1rem;
  padding: 0.85rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.list-chapter-position {
  margin: 0 0 0.35rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
}

.list-chapter-heading {
  margin: 0 0 0.65rem;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--accent-dark);
}

.list-chapter-select {
  width: 100%;
  margin-bottom: 0.75rem;
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
}

.list-chapter-select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.list-chapter-nav-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.list-chapter-btn {
  flex: 1 1 calc(50% - 0.25rem);
  min-height: 2.75rem;
  padding-left: 0.75rem;
  padding-right: 0.75rem;
  font-size: 0.9rem;
}

.list-chapter-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

@media (min-width: 480px) {
  .list-chapter-nav-buttons {
    flex-wrap: nowrap;
    justify-content: space-between;
  }

  .list-chapter-btn {
    flex: 0 1 auto;
    min-width: 8.5rem;
    max-width: 12rem;
  }
}

.list-question {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.list-question-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-rows: auto auto;
  gap: 0.15rem 0.65rem;
  width: 100%;
  padding: 0.75rem 0.85rem;
  border: none;
  background: transparent;
  text-align: left;
  cursor: pointer;
  color: inherit;
  font: inherit;
}

.list-question-header:hover {
  background: #fafbfc;
}

.list-question-num {
  grid-row: 1 / span 2;
  align-self: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent-dark);
  min-width: 1.75rem;
}

.list-question-meta {
  font-size: 0.78rem;
  color: var(--muted);
}

.list-question-preview {
  grid-column: 2;
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.list-question-toggle {
  grid-row: 1 / span 2;
  align-self: center;
  font-size: 0.7rem;
  color: var(--muted);
}

.list-question-body {
  padding: 0 0.85rem 0.85rem;
  border-top: 1px solid var(--border);
}

.list-question.is-collapsed .list-question-body {
  display: none;
}

.list-question.is-collapsed .list-question-preview {
  -webkit-line-clamp: 1;
}

.list-question-text {
  font-size: 1rem;
  font-weight: 600;
  margin: 0.75rem 0 0.65rem;
}

.list-options {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.4rem;
}

.list-option {
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fafbfc;
  font-size: 0.9rem;
  line-height: 1.4;
}

.list-option.correct {
  border-color: var(--ok);
  background: var(--ok-bg);
  color: var(--ok);
  font-weight: 600;
}

.list-explanation-label {
  margin: 0.85rem 0 0.25rem;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.list-explanation {
  margin: 0 0 0.25rem;
  padding: 0.65rem 0.75rem;
  font-size: 0.88rem;
  color: var(--text);
  background: #eef4ff;
  border-radius: 8px;
  line-height: 1.45;
}

.exam-settings-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0.65rem 0 0;
  font-size: 0.88rem;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}

.exam-settings-toggle input {
  width: 1rem;
  height: 1rem;
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

.feedback .exam-explanation {
  margin-top: 0.65rem;
  padding-top: 0.55rem;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.de-peek-line {
  display: inline;
}

.de-peek-text {
  display: inline;
}

.de-peek-trigger {
  display: inline-block;
  width: auto;
  max-width: max-content;
  padding: 0;
  margin: 0;
  margin-left: 0.15em;
  background: none;
  font-size: 0.85em;
  font-weight: 600;
  color: var(--muted);
  text-align: left;
  cursor: help;
  text-decoration: underline;
  text-underline-offset: 0.15em;
  border-radius: 2px;
  white-space: nowrap;
  vertical-align: baseline;
  flex: 0 0 auto;
  align-self: auto;
}

.de-peek-trigger:hover,
.de-peek-trigger:focus-visible,
.de-peek-trigger.is-peek-open {
  color: var(--accent);
  text-decoration-color: var(--accent);
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.de-peek-popover {
  position: fixed;
  z-index: 1000;
  max-width: min(360px, calc(100vw - 1rem));
  padding: 0.55rem 0.7rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  font-size: 0.88rem;
  line-height: 1.4;
  pointer-events: auto;
}

.de-peek-popover-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.de-peek-popover-text {
  margin: 0;
  color: var(--text);
  font-weight: 500;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.study-hub {
  margin-bottom: 1.5rem;
}

.study-hub-title {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
}

.study-hub-grid {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr;
}

@media (min-width: 560px) {
  .study-hub-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.study-card {
  display: block;
  padding: 1rem 1.1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s;
}

.study-card:hover {
  text-decoration: none;
  border-color: var(--accent);
  transform: translateY(-1px);
}

.study-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  color: var(--accent-dark);
}

.study-card-desc {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.4;
}

.study-card--exam {
  border-left: 4px solid var(--accent);
}

.study-card--review {
  border-left: 4px solid #6b4ce6;
}

.study-card--muted {
  opacity: 0.75;
}

.study-readiness {
  margin: 0.85rem 0 0;
  font-size: 0.82rem;
  color: var(--text);
  line-height: 1.45;
  white-space: pre-line;
}

.study-tip {
  margin: 0.35rem 0 0;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.4;
}

.exam-intro h2 {
  margin-top: 0;
}

.exam-intro-cta {
  margin: 0.75rem 0 1rem;
}

.exam-intro-cta .btn-primary {
  width: 100%;
}

.exam-pass-rules {
  margin: 0 0 1rem;
  padding: 0.85rem 1rem;
  font-size: 0.88rem;
  line-height: 1.45;
  background: #f4f7fb;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
}

.exam-pass-rules h3 {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
}

.exam-pass-rules h4 {
  margin: 0.65rem 0 0.35rem;
  font-size: 0.85rem;
  font-weight: 600;
}

.exam-pass-rules section:first-of-type h4 {
  margin-top: 0;
}

.exam-pass-rules-list {
  margin: 0;
  padding-left: 1.15rem;
}

.exam-pass-rules-list li + li {
  margin-top: 0.3rem;
}

.exam-pass-rules-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.exam-pass-rules--result {
  margin-bottom: 1rem;
}

.exam-pass-rules-details {
  margin: 0 0 1rem;
  font-size: 0.88rem;
}

.exam-pass-rules-details summary {
  cursor: pointer;
  color: var(--accent-dark);
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.exam-pass-rules-details[open] summary {
  margin-bottom: 0.5rem;
}

.exam-rules {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
  font-size: 0.9rem;
  line-height: 1.45;
}

.exam-rules li + li {
  margin-top: 0.35rem;
}

.exam-pool-note,
.exam-loading,
.review-loading {
  font-size: 0.85rem;
  color: var(--muted);
}

.exam-nav-row {
  margin-top: 0.5rem;
}

.exam-submit-row {
  margin-top: 0.75rem;
}

.exam-answered-hint {
  margin: 0.65rem 0 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.btn-wide {
  width: 100%;
}

.exam-result-verdict {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}

.exam-result-verdict.is-pass {
  color: var(--ok);
}

.exam-result-verdict.is-fail {
  color: var(--bad);
}

.exam-result-detail {
  margin: 0 0 0.75rem;
}

.exam-result-streak {
  margin: 0 0 1rem;
  padding: 0.65rem 0.75rem;
  font-size: 0.88rem;
  background: #f0f4ff;
  border-radius: 8px;
  line-height: 1.4;
  white-space: pre-line;
}

.exam-result-streak.is-ready {
  background: var(--ok-bg);
  color: var(--ok);
  font-weight: 600;
}

.exam-review-list {
  margin: 0 0 1rem;
  text-align: left;
}

.exam-review-list h3 {
  margin: 0 0 0.65rem;
  font-size: 0.95rem;
}

.exam-review-item {
  padding: 0.65rem 0;
  border-top: 1px solid var(--border);
}

.exam-review-item:first-of-type {
  border-top: none;
}

.exam-review-q {
  margin: 0 0 0.35rem;
  font-weight: 600;
  font-size: 0.9rem;
}

.exam-review-a {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.footer-time {
  margin: 0 0 0.35rem;
  font-weight: 600;
  color: var(--text);
}

.footer-link-btn {
  display: inline-block;
  margin: 0 0 0.75rem;
  padding: 0;
  border: none;
  background: none;
  color: var(--accent);
  font-size: 0.78rem;
  cursor: pointer;
  text-decoration: underline;
}

.footer-link-btn:hover {
  color: var(--accent-dark);
}

.footer-data {
  margin: 0;
  font-size: 0.72rem;
}

.footer-data a {
  color: var(--muted);
}

.footer-data a:hover {
  color: var(--accent-dark);
}

.site-footer {
  margin-top: 2rem;
  padding: 1rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
}

@media (min-width: 600px) {
  .app-header h1 {
    font-size: 1.6rem;
  }

  .quiz-card {
    padding: 1.35rem 1.5rem;
  }
}