/* ============================================================
   Tokens
   ============================================================ */
:root {
  --paper: #ece9e1;
  --surface: #fbfaf6;
  --ink: #1d2333;
  --ink-soft: #565f70;
  --line: #d6d0c0;
  --brass: #8c6a28;
  --brass-soft: #eee3cd;
  --pass: #1f6f45;
  --pass-bg: #e4efe7;
  --fail: #a32b20;
  --fail-bg: #f6e6e3;

  --font-display: "IBM Plex Serif", Georgia, serif;
  --font-body: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  --radius: 3px;
}

/* ============================================================
   Reset & base
   ============================================================ */
* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  margin: 0;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 600;
  margin: 0 0 0.6em;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 1.75rem;
}
h2 {
  font-size: 1.3rem;
}
h3 {
  font-size: 1.05rem;
}

p {
  margin: 0 0 0.75em;
}

ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

button {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  background: var(--ink);
  color: var(--surface);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  padding: 0.55rem 1.1rem;
  cursor: pointer;
  transition: background-color 150ms ease, transform 100ms ease;
}

button:hover:not(:disabled) {
  background: #323a52;
}

button:active:not(:disabled) {
  transform: translateY(1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

/* Secondary / utility buttons — outline instead of filled */
.option-row button,
button[type="button"] {
  background: transparent;
  color: var(--ink);
}

.option-row button:hover:not(:disabled),
button[type="button"]:hover:not(:disabled) {
  background: var(--brass-soft);
}

input,
select,
textarea {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.5rem 0.6rem;
}

label {
  display: block;
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-top: 0.85rem;
  margin-bottom: 0.25rem;
}

/* Full-width block inputs — explicitly excludes radio/checkbox, which must
   keep their native size wherever they appear inside a <form> (option
   editors, true/false pickers, student checklists). */
form input:not([type="radio"]):not([type="checkbox"]),
form select {
  display: block;
  width: 100%;
}

.option-row input[type="radio"],
.option-row input[type="checkbox"] {
  width: auto;
  flex: none;
}

a {
  color: var(--brass);
}

:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}

.error {
  color: var(--fail);
  background: var(--fail-bg);
  border-left: 3px solid var(--fail);
  padding: 0.5rem 0.75rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.9rem;
}

.hint {
  color: var(--ink-soft);
  font-size: 0.85rem;
  font-family: var(--font-mono);
}

/* ============================================================
   Shell: topbar, page container
   ============================================================ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  padding: 0.9rem 1.5rem;
}

.topbar-identity {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.topbar-name {
  font-weight: 500;
}

.role-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--brass);
  background: var(--brass-soft);
  border-radius: var(--radius);
  padding: 0.15rem 0.5rem;
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 600;
}

/* Every page under the topbar gets consistent horizontal rhythm */
.quiz-list-page,
.taking-quiz-page,
.result-page,
.teacher-home {
  max-width: 880px;
  margin: 0 auto;
  padding: 1.75rem 1.5rem 3rem;
}

.login-page {
  max-width: 420px;
  margin: 4rem auto;
  padding: 0 1.5rem;
}

/* ============================================================
   Login
   ============================================================ */
.login-page .wordmark {
  font-size: 2rem;
  margin-bottom: 0.25rem;
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.75rem;
  margin-top: 1.5rem;
}

.login-card button[type="submit"] {
  width: 100%;
  margin-top: 1.25rem;
}

.login-page .hint {
  margin-top: 1rem;
  text-align: center;
}

/* ============================================================
   Quiz list (student)
   ============================================================ */
.quiz-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin: 1rem 0;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line);
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.meta-label {
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.meta-value {
  font-family: var(--font-mono);
  font-size: 1.05rem;
}

/* Smaller inline mono tag — inherits color so it stays readable both in
   normal rows and on the dark `.selected` background of topic/quiz items. */
.tag-mono {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  opacity: 0.72;
}

/* ============================================================
   Taking a quiz
   ============================================================ */
.question {
  display: flex;
  gap: 1rem;
  border-top: 1px solid var(--line);
  padding: 1.25rem 0;
}

.question:first-of-type {
  border-top: none;
}

.question-number {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--brass);
  flex-shrink: 0;
  padding-top: 0.15rem;
}

.question-body {
  flex: 1;
  min-width: 0;
}

.question-text {
  font-weight: 500;
  margin-bottom: 0.6rem;
}

.option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: normal;
  margin: 0 0 0.35rem;
}

.option input {
  width: auto;
}

.quiz-actions {
  position: sticky;
  bottom: 0;
  background: var(--paper);
  border-top: 1px solid var(--line);
  margin: 0 -1.5rem;
  padding: 1rem 1.5rem;
  box-shadow: 0 -6px 12px -8px rgba(29, 35, 51, 0.15);
}

.quiz-actions button {
  width: 100%;
}

.time-remaining {
  display: block;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin-bottom: 0.6rem;
}

.time-remaining.low {
  color: var(--fail);
  font-weight: 600;
}

/* ============================================================
   Result
   ============================================================ */
.result-page {
  text-align: center;
}

.grade-stamp {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.4rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 3px solid currentColor;
  border-radius: var(--radius);
  padding: 0.6rem 1.5rem;
  margin: 1rem 0 1.5rem;
  transform: rotate(-4deg);
  animation: stamp-down 260ms ease-out;
}

.grade-stamp.passed {
  color: var(--pass);
  background: var(--pass-bg);
}

.grade-stamp.failed {
  color: var(--fail);
  background: var(--fail-bg);
}

@keyframes stamp-down {
  from {
    opacity: 0;
    transform: rotate(-4deg) scale(1.4);
  }
  to {
    opacity: 1;
    transform: rotate(-4deg) scale(1);
  }
}

.score-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.results-panel {
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line);
}

.attempt-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding: 0.4rem 0;
}

/* Compact, non-animated variant of the big result-page stamp/score, sized
   for a list row instead of a standalone celebratory screen. */
.attempt-row .score-value {
  display: inline;
  font-size: 0.95rem;
  margin-bottom: 0;
}

.attempt-row .grade-stamp {
  font-size: 0.75rem;
  border-width: 1px;
  padding: 0.15rem 0.5rem;
  margin: 0;
  transform: none;
  animation: none;
}

/* ============================================================
   Teacher admin
   ============================================================ */
.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.tab-button {
  background: transparent;
  color: var(--ink-soft);
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  padding: 0.6rem 0.25rem;
  margin-bottom: -1px;
  margin-right: 1.25rem;
}

.tab-button:hover:not(:disabled) {
  background: transparent;
  color: var(--ink);
}

.tab-button.active {
  color: var(--ink);
  border-bottom-color: var(--brass);
  font-weight: 600;
}

.teacher-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 2rem;
  align-items: start;
  margin-top: 1rem;
}

.topics-panel,
.quizzes-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.topics-panel form {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.topic-item {
  padding: 0.5rem 0.6rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.92rem;
}

.topic-item:hover {
  background: var(--brass-soft);
}

.topic-item.selected {
  background: var(--ink);
  color: var(--surface);
}

/* Outline buttons default to ink-on-transparent, which is invisible against
   the dark background above — flip them to light-on-transparent here. */
.topic-item.selected button[type="button"] {
  color: var(--surface);
  border-color: var(--surface);
}

.topic-item.selected button[type="button"]:hover:not(:disabled) {
  background: rgba(251, 250, 246, 0.15);
}

/* ---- Tests page: page-level header + quiz card grid ---- */

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.page-header h1 {
  margin: 0;
}

.quiz-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

/* Named `-manage-` to avoid colliding with the unrelated `.quiz-card` class
   used by the student-facing Browse page (Quizzes/Browse/View.fs). */
.quiz-manage-card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  cursor: pointer;
}

.quiz-manage-card:hover {
  border-color: var(--brass);
}

.quiz-manage-card.selected {
  background: var(--ink);
  color: var(--surface);
  border-color: var(--ink);
}

.quiz-manage-card-title {
  margin: 0;
}

.quiz-manage-card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
  padding-top: 0.4rem;
}

.quiz-manage-card-actions button {
  flex: 1 1 auto;
}

/* Outline buttons default to ink-on-transparent, which is invisible against
   the dark background of a selected card — flip them to light-on-transparent. */
.quiz-manage-card.selected button[type="button"] {
  color: var(--surface);
  border-color: var(--surface);
}

.quiz-manage-card.selected button[type="button"]:hover:not(:disabled) {
  background: rgba(251, 250, 246, 0.15);
}

/* ---- Tests page: results view (quiz cards shift into a narrow left
   column, results table takes the rest) ---- */

.results-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 2rem;
  align-items: start;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.results-table th,
.results-table td {
  text-align: left;
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--line);
}

.results-table th {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.results-table tbody tr:hover {
  background: var(--brass-soft);
}

.focus-loss-value {
  font-family: var(--font-mono);
}

.focus-loss-value.warn {
  color: var(--fail);
  font-weight: 600;
}

/* Compact, non-animated variant for the "Результат" column — the default
   `.grade-stamp` is sized/rotated for the standalone result screen and
   would overflow a table cell. */
.results-table .grade-stamp {
  font-size: 0.75rem;
  border-width: 1px;
  padding: 0.15rem 0.5rem;
  margin: 0;
  transform: none;
  animation: none;
}

.questions-list,
.assignment-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
}

.questions-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  border-top: 1px solid var(--line);
  padding: 0.6rem 0;
}

.questions-list li:first-child {
  border-top: none;
}

.question-kind {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--brass);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-right: 0.5rem;
}

.new-question-form {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
}

.new-question-form > button + button {
  margin-left: 0.5rem;
}

.pool-picker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.pool-picker p {
  flex-basis: 100%;
  margin-bottom: 0;
}

.question-picker input[type="text"] + button {
  margin-left: 0.5rem;
}

/* The global `form input:not([type=radio]):not([type=checkbox]) { width:
   100% }` rule outweighs a single class here, so this needs !important to
   keep the field beside its button instead of stacking under it. */
.pool-count-input {
  display: inline-block !important;
  width: 6rem !important;
}

.pool-rules-summary li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.3rem 0;
}

/* ---- Modal overlay (quiz create/edit form) ---- */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(29, 35, 51, 0.55);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 3rem 1.5rem;
  overflow-y: auto;
  z-index: 100;
}

.modal-dialog {
  width: 100%;
  max-width: 560px;
}

.modal-backdrop .new-question-form {
  box-shadow: 0 20px 48px rgba(29, 35, 51, 0.3);
}

.options-editor {
  margin: 0.5rem 0 1rem;
}

.option-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.option-row input[type="text"] {
  flex: 1;
}

.student-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 0;
  font-size: 0.92rem;
  cursor: pointer;
}

.student-row input {
  width: auto;
}

/* ---- Admin: users list ---- */

.users-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  border-top: 1px solid var(--line);
  padding: 0.6rem 0;
}

.users-list li:first-child {
  border-top: none;
}

.user-row-info {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  flex: 1 1 200px;
}

.user-row-name {
  font-weight: 500;
}

.user-row-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.3rem;
}

.user-row-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-left: auto;
}

.status-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius);
  padding: 0.15rem 0.5rem;
}

.status-badge.active {
  color: var(--pass);
  background: var(--pass-bg);
}

.status-badge.inactive {
  color: var(--fail);
  background: var(--fail-bg);
}

/* ============================================================
   Accessibility & motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 640px) {
  .teacher-layout,
  .results-layout {
    grid-template-columns: 1fr;
  }

  .topbar {
    padding: 0.75rem 1rem;
  }

  .quiz-list-page,
  .taking-quiz-page,
  .result-page,
  .teacher-home {
    padding: 1.25rem 1rem 3rem;
  }

  .quiz-actions {
    margin: 0 -1rem;
    padding: 1rem;
  }
}