/* ============================================================
   Quiz App — base styles (plain CSS, no framework)
   ============================================================ */

:root {
  --color-bg: #f4f5f7;
  --color-card: #ffffff;
  --color-border: #dcdfe4;
  --color-text: #1f2430;
  --color-muted: #6b7280;
  --color-primary: #3454d1;
  --color-primary-hover: #2a44ab;
  --color-error: #c0392b;
  --color-success: #1e8e5a;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

* { box-sizing: border-box; }

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

.page-center {
  max-width: 480px;
  margin: 48px auto;
  padding: 0 16px;
}

h1 {
  text-align: center;
  margin-bottom: 24px;
}

.lang-switch {
  text-align: right;
  margin: 0 0 8px;
  font-size: 0.85rem;
}

.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
}

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

label {
  display: block;
  margin: 12px 0 4px;
  font-size: 0.9rem;
  color: var(--color-muted);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
textarea,
select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: inherit;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-primary);
}

button,
.button {
  display: inline-block;
  margin-top: 16px;
  padding: 10px 18px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  text-align: center;
}

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

.error {
  color: var(--color-error);
  font-size: 0.9rem;
  margin-top: 8px;
}

.success {
  color: var(--color-success);
  font-size: 0.9rem;
  margin-top: 8px;
}

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

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

/* ---- Wider app pages (dashboard, builder, grading) ---- */

.page-wide {
  max-width: 960px;
  margin: 32px auto;
  padding: 0 16px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.topbar h1 {
  margin: 0;
  text-align: left;
  font-size: 1.4rem;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.9rem;
}

.row-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.row-between h2 {
  margin: 0;
}

.small {
  font-size: 0.8rem;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
}

.data-table th,
.data-table td {
  text-align: left;
  padding: 10px 8px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.data-table th {
  color: var(--color-muted);
  font-weight: 600;
  font-size: 0.85rem;
}

.data-table .actions a {
  margin-right: 12px;
  font-size: 0.9rem;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-draft { background: #eef0f3; color: var(--color-muted); }
.badge-published { background: #e3f6ec; color: var(--color-success); }
.badge-closed { background: #f4e7e6; color: var(--color-error); }
.badge-pending { background: #fdf1d6; color: #8a6116; margin-left: 6px; }
.badge-partial { background: #fdf1d6; color: #8a6116; }

/* ---- Quiz builder ---- */

.conditional-field {
  padding-left: 4px;
  border-left: 2px solid var(--color-border);
  margin-top: 4px;
}

.inline-form {
  display: inline;
}

.inline-form-row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 16px;
  flex-wrap: wrap;
}

.inline-form-row input {
  width: auto;
  flex: 1;
  min-width: 140px;
}

.inline-form-row button {
  margin-top: 0;
  white-space: nowrap;
}

.link-button {
  background: none;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0;
  margin: 0 6px 0 0;
  text-decoration: underline;
}

.link-danger {
  color: var(--color-error);
}

label input[type="checkbox"] {
  width: auto;
  margin-right: 6px;
}

/* ---- Question editor ---- */

.subject-heading {
  margin: 24px 0 8px;
  font-size: 1rem;
  color: var(--color-muted);
}

.badge-type {
  background: #eef1fb;
  color: var(--color-primary);
}

.two-col {
  display: flex;
  gap: 16px;
}

.two-col > div {
  flex: 1;
}

.conditional-section {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.conditional-section h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.option-row {
  margin-bottom: 10px;
  padding: 10px;
  background: var(--color-bg);
  border-radius: var(--radius);
}

.option-row-main {
  display: flex;
  gap: 8px;
  align-items: center;
}

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

.option-row-main input[type="file"] {
  width: 160px;
  padding: 4px;
  border: none;
  font-size: 0.8rem;
}

.correct-marker-cell {
  white-space: nowrap;
}

.key-answer-row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
}

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

.key-answer-row select {
  width: auto;
}

.inline-checkbox {
  display: inline-flex;
  align-items: center;
  font-size: 0.85rem;
  color: var(--color-muted);
  white-space: nowrap;
}

.image-preview {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 6px 0;
}

.image-preview img {
  max-width: 120px;
  max-height: 80px;
  border-radius: 4px;
  border: 1px solid var(--color-border);
}

.error.small {
  font-size: 0.85rem;
}

.katex-preview {
  min-height: 1.2em;
  padding: 8px 10px;
  background: var(--color-bg);
  border-radius: var(--radius);
  margin-bottom: 12px;
  font-size: 0.95rem;
}

/* ---- Quiz runner ---- */

.runner-page {
  max-width: 560px;
}

.runner-page-wide {
  max-width: 960px;
}

.runner-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.timer {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  background: #fdf1d6;
  color: #8a6116;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.9rem;
}

.subject-tag {
  margin: 0 0 4px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.question-text {
  font-size: 1.1rem;
  margin-top: 0;
}

.question-image {
  max-width: 100%;
  border-radius: var(--radius);
  margin-bottom: 16px;
  display: block;
}

.option-choices {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 16px 0;
}

.option-choice {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
}

.option-choice input {
  width: auto;
  margin: 0;
}

.option-image {
  max-width: 80px;
  max-height: 60px;
  border-radius: 4px;
}

.runner-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 20px;
}

.runner-nav button {
  margin-top: 0;
}

.button-secondary {
  background: var(--color-card);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

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

.finish-separator {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 16px 0;
}

.finish-row {
  text-align: center;
}

.finish-row button {
  margin-top: 0;
}

/* ---- Grade review ---- */

.grading-row {
  margin-bottom: 12px;
}

.grading-row-main {
  display: flex;
  gap: 20px;
  justify-content: space-between;
}

.grading-answer {
  flex: 1;
}

.grading-answer p {
  margin: 0 0 6px;
}

.answer-image {
  max-width: 200px;
  max-height: 140px;
  border-radius: var(--radius);
  display: block;
  margin-bottom: 6px;
}

.grading-score {
  width: 140px;
  flex-shrink: 0;
  text-align: right;
}

.score-input {
  text-align: right;
}

.score-quick {
  margin-top: 4px;
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.score-quick .link-button {
  font-size: 0.8rem;
  margin: 0;
}

/* ---- Result page ---- */

.score-summary {
  text-align: center;
}

.score-headline {
  font-size: 1.2rem;
  margin: 8px 0;
}

.result-question .question-text {
  font-size: 1rem;
}

.result-option {
  cursor: default;
  justify-content: flex-start;
  position: relative;
}

.result-option-key {
  border-color: var(--color-success);
  background: #f0faf4;
}

.result-option-wrong {
  border-color: var(--color-error);
  background: #fdf2f1;
}

.tag-correct {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--color-success);
  font-weight: 600;
}

.result-score {
  margin-top: 12px;
  margin-bottom: 0;
}