/* وصلها 4 — study styles: question pieces, level exams, practice hub, review and
   the guided lesson. Tokens only; spacing on the 4px scale. */

/* ---------- Disclosure rows used across study pages ---------- */
.question-help > summary, .question-map-panel > summary, .more-explanation > summary, .original-material > summary,
.example-context > summary, .scene-panel > summary, .lesson-tools details > summary, .lesson-paper details > summary, .answer-review > summary,
.paper-scope > summary, .review-reasons > summary, .danger-zone > summary {
  display: flex; align-items: center; gap: var(--space-2); min-height: var(--control-height); cursor: pointer; list-style: none; font-weight: 600; color: var(--text-2);
}
:is(.question-help, .question-map-panel, .more-explanation, .original-material, .example-context, .scene-panel, .lesson-tools details, .lesson-paper details, .answer-review, .paper-scope, .review-reasons, .danger-zone) > summary::-webkit-details-marker { display: none; }
:is(.question-help, .question-map-panel, .more-explanation, .original-material, .example-context, .lesson-tools details, .lesson-paper details, .paper-scope, .review-reasons, .danger-zone) > summary::after {
  content: ''; width: .5em; height: .5em; margin-inline-start: auto; border: solid currentColor; border-width: 0 2px 2px 0; transform: rotate(45deg); transition: transform var(--fast) var(--ease-out);
}
:is(.question-help, .question-map-panel, .more-explanation, .original-material, .example-context, .lesson-tools details, .lesson-paper details, .paper-scope, .review-reasons, .danger-zone)[open] > summary::after { transform: rotate(225deg); }
:is(.question-help, .question-map-panel, .more-explanation, .original-material, .example-context, .lesson-tools details, .lesson-paper details, .paper-scope, .review-reasons, .danger-zone) > summary:hover { color: var(--text); }

/* ---------- Question card ---------- */
.question-card { container-type: inline-size; }
.question-tools { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3); }
.question-help { border: 1px solid var(--line); border-radius: var(--radius-card); padding-inline: var(--space-4); background: var(--surface-1); }
.question-help[open] { border-color: color-mix(in srgb, var(--info) 40%, var(--line)); }
.question-help > summary .icon { color: var(--info); }
.question-help-body { display: grid; gap: var(--space-3); padding-block: 0 var(--space-4); }
.vocabulary { display: grid; gap: var(--space-2); margin: 0; }
.vocabulary div { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: var(--space-3); padding: var(--space-2) var(--space-3); border-radius: var(--radius-control); background: var(--surface-2); }
.vocabulary dt { font-weight: 600; text-align: left; }
.vocabulary dd { margin: 0; color: var(--text-2); }
.option-text { display: grid; gap: var(--space-1); min-width: 0; overflow-wrap: anywhere; }
.option-text[lang="en"] { text-align: left; }
.option-meaning { display: block; color: var(--text-2); font-size: var(--text-sm); text-align: right; }
.option-meaning[hidden] { display: none; }
/* English cards read left to right like the exam paper; the meaning lines up under the option. */
.options[dir="ltr"] .option-meaning { text-align: left; }
.option-mark { display: inline-flex; align-items: center; gap: var(--space-1); white-space: nowrap; }
.option.is-correct .option-mark { color: var(--success); }
.option.is-wrong .option-mark { color: var(--danger); }
.option.is-wrong:disabled { opacity: 1; }
@container (max-width: 520px) {
  .option { grid-template-columns: 36px minmax(0, 1fr); }
  .option-mark { grid-column: 2; }
}
.explanation { display: grid; gap: var(--space-2); }
.explanation p[lang="en"] { color: var(--text-2); text-align: left; }
.feedback:focus { outline: none; }
.feedback:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ---------- Quiz frame (level exam, guided practice, review session) ---------- */
.quiz-bar { margin-inline: calc(-1 * var(--space-4)); padding-inline: var(--space-4); border-block-end: 1px solid var(--line); }
.quiz-bar-main { flex: 1; min-width: 0; display: grid; gap: var(--space-2); }
.quiz-title { font-size: var(--text-sm); font-weight: 600; color: var(--text-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.quiz-progress { flex: none; }
.question-map-panel { border-block-start: 1px solid var(--line); padding-block-start: var(--space-2); }
.question-map { list-style: none; margin: 0; padding: var(--space-3) 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(52px, 1fr)); gap: var(--space-2); }
.question-map-item {
  display: inline-flex; align-items: center; justify-content: center; gap: 2px; width: 100%; min-height: var(--control-height);
  border: 1px solid var(--line-strong); border-radius: var(--radius-control); background: var(--surface-1); color: var(--text-2); font: inherit; font-weight: 600;
}
.question-map-item .icon { width: 14px; height: 14px; }
.question-map-item.is-answered { border-color: var(--control); color: var(--text); }
.question-map-item.is-flagged { border-color: var(--warning); color: var(--warning); }
.question-map-item[aria-current="step"] { border-color: var(--accent); background: var(--accent-soft); color: var(--text); }
.confirm-card { display: grid; gap: var(--space-4); padding: var(--space-6) var(--space-5); }
.confirm-card h1 { font-size: var(--text-xl); }
.quiz-result { gap: var(--space-6); }
.result-facts { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-2); }
.result-facts span { display: inline-flex; align-items: baseline; gap: var(--space-2); padding: var(--space-2) var(--space-4); border: 1px solid var(--line); border-radius: var(--radius-pill); background: var(--surface-1); color: var(--text-2); }
.result-facts b { font-family: var(--font-display); font-size: var(--text-xl); color: var(--text); }
.result-hero .btn-row { justify-content: center; margin-block-start: var(--space-3); }
.result-hero h1.result-score:focus { outline: none; }
.review-plan { display: grid; gap: var(--space-3); padding: var(--space-5); }
.review-plan h2 { font-size: var(--text-lg); }
.answers { display: grid; gap: var(--space-3); }
.answers h2 { font-size: var(--text-xl); margin-block-end: var(--space-2); }
.answer-review { border: 1px solid var(--line); border-inline-start: 3px solid var(--line-strong); border-radius: var(--radius-card); background: var(--surface-1); padding-inline: var(--space-4); }
.answer-review.is-correct { border-inline-start-color: var(--success); }
.answer-review.needs-review { border-inline-start-color: var(--danger); }
.answer-review > summary { flex-wrap: wrap; justify-content: space-between; padding-block: var(--space-2); color: var(--text); }
.answer-status { display: inline-flex; align-items: center; gap: var(--space-2); font-size: var(--text-sm); }
.answer-review.is-correct .answer-status { color: var(--success); }
.answer-review.needs-review .answer-status { color: var(--danger); }
.answer-lesson { font-weight: 600; }
.answer-review-body { display: grid; gap: var(--space-3); padding-block: 0 var(--space-4); }
.answer-prompt[lang="en"] { text-align: left; font-weight: 500; }
.answer-choices { display: grid; gap: var(--space-2); margin: 0; }
.answer-choices div { display: grid; gap: var(--space-1); padding: var(--space-3); border-radius: var(--radius-control); background: var(--surface-2); }
.answer-choices dt { color: var(--text-3); font-size: var(--text-sm); }
.answer-choices dd { margin: 0; }
.answer-choices dd[lang="en"] { text-align: left; }
.answer-reason { display: grid; gap: var(--space-2); }

/* ---------- Practice hub ---------- */
.subject-switcher { display: flex; gap: var(--space-2); overflow-x: auto; scrollbar-width: none; padding-block: var(--space-1); }
.subject-switcher::-webkit-scrollbar { display: none; }
.subject-chip { flex: none; min-height: var(--control-height); text-decoration: none; }
.subject-chip:not([aria-current])::before { content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--ribbon); }
.subject-chip .icon { color: var(--ribbon); }
.practice-section { display: grid; gap: var(--space-4); }
.practice-lectures { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-4); }
.practice-lecture { position: relative; display: grid; gap: var(--space-4); padding: var(--space-6) var(--card-pad) var(--card-pad); }
.practice-lecture-head { display: grid; gap: var(--space-1); }
.practice-lecture-head h3 { font-size: var(--text-lg); }
.practice-lecture-head h3 a { color: var(--text); text-decoration: none; }
.practice-lecture-head h3 a:hover { color: var(--accent); text-decoration: underline; }
.paper-cards { display: grid; gap: var(--space-3); grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr)); }
.paper-card { display: grid; gap: var(--space-3); align-content: start; padding: var(--space-5); }
.paper-card-head { display: grid; gap: 2px; }
.paper-card-head strong { font-size: var(--text-lg); }
.paper-card small { color: var(--text-2); }
.paper-last { color: var(--text-2); font-size: var(--text-sm); }
.paper-last strong { color: var(--text); }

/* ---------- Review ---------- */
.review-summary { display: grid; gap: var(--space-4); padding: var(--space-5); }
@media (min-width: 768px) { .review-summary { grid-template-columns: minmax(0, 1fr) auto; align-items: center; } .review-summary .chip-row { grid-column: 1; } .review-summary .btn { grid-row: 1 / span 2; grid-column: 2; } }
.review-total { font-size: var(--text-lg); color: var(--text-2); }
.review-total strong { font-family: var(--font-display); font-size: var(--text-2xl); font-weight: 800; color: var(--text); }
.review-summary .chip-row { list-style: none; margin: 0; padding: 0; }
.ribbon-dot { display: inline-flex; align-items: center; gap: var(--space-2); }
.ribbon-dot::before { content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--ribbon); }
.review-groups { display: grid; gap: var(--space-6); }
.review-group { display: grid; gap: var(--space-3); }
.review-group h3 { display: grid; gap: 2px; font-size: var(--text-lg); }
.review-group h3 .kicker { color: var(--ribbon); }
.review-row { flex-wrap: wrap; }
.review-row > .icon { color: var(--text-3); }
.review-actions { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-inline-start: auto; }
.paper-score { font-family: var(--font-display); font-weight: 800; color: var(--text); white-space: nowrap; }
.guided-links { display: inline-flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }
/* Phones: the label on its own line and both languages side by side, never one button alone. */
@media (max-width: 599px) {
  .guided-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); flex: 1 1 100%; }
  .guided-links > .faint { grid-column: 1 / -1; }
}

/* ---------- Guided lesson ---------- */
.lesson { width: 100%; max-width: 1200px; margin-inline: auto; padding: 0 var(--space-4) var(--space-8); display: grid; gap: var(--space-5); }
.lesson-bar {
  position: sticky; top: 0; z-index: 30; display: flex; align-items: center; justify-content: space-between; gap: var(--space-3);
  margin-inline: calc(-1 * var(--space-4)); padding: var(--space-2) var(--space-4); padding-top: max(var(--space-2), env(safe-area-inset-top));
  background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(12px); border-block-end: 1px solid var(--line);
}
.lesson-count { color: var(--text-2); font-size: var(--text-sm); font-weight: 600; }
.lesson-head { display: grid; gap: var(--space-2); }
.lesson-head .kicker { color: var(--ribbon); }
.lesson-head h1 { font-size: var(--text-2xl); }
.lesson-steps { list-style: none; margin: var(--space-3) 0 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: var(--space-2); counter-reset: none; }
.lesson-steps li { position: relative; display: grid; justify-items: center; gap: var(--space-1); color: var(--text-3); font-size: var(--text-xs); text-align: center; }
.lesson-steps li::before { content: ''; position: absolute; top: 14px; inset-inline-start: calc(50% + 18px); inset-inline-end: calc(-50% + 18px); height: 2px; border-radius: 2px; background: var(--line-strong); }
.lesson-steps li:last-child::before { display: none; }
.lesson-steps li.is-done::before { background: var(--success); }
.lesson-step-mark { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--line-strong); background: var(--surface-1); font-weight: 700; font-size: var(--text-xs); color: var(--text-2); }
.lesson-step-mark .icon { width: 16px; height: 16px; }
.lesson-steps li.is-done { color: var(--text-2); }
.lesson-steps li.is-done .lesson-step-mark { border-color: var(--success); background: var(--success-soft); color: var(--success); }
.lesson-steps li.is-current { color: var(--text); font-weight: 600; }
.lesson-steps li.is-current .lesson-step-mark { border-color: var(--accent); background: var(--accent); color: var(--on-accent); }
@media (max-width: 479px) { .lesson-steps li:not(.is-current) > span:last-child { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; } }
.lesson-layout { display: grid; gap: var(--space-5); align-items: start; }
@media (min-width: 1024px) {
  .lesson { padding-inline: var(--space-6); }
  .lesson-bar { margin-inline: calc(-1 * var(--space-6)); padding-inline: var(--space-6); }
  .lesson-layout { grid-template-columns: minmax(0, 1fr) 340px; gap: var(--space-6); }
  .lesson-aside { position: sticky; top: calc(var(--topbar-height) + var(--space-3)); max-height: calc(100dvh - var(--topbar-height) - var(--space-5)); overflow-y: auto; }
}
.lesson-layout > * { min-width: 0; }
.lesson-main { display: grid; gap: var(--space-4); }
.lesson-aside { display: grid; gap: var(--space-4); }
.panel-title { display: flex; align-items: center; gap: var(--space-2); font-size: var(--text-lg); }
.panel-title .icon { color: var(--accent); }
.lesson-paper { display: grid; gap: var(--space-4); padding: var(--space-6) var(--space-5); }
.lesson-paper > h2 { font-size: var(--text-xl); }
.lesson-paper h2:focus { outline: none; }
.lesson-paper h3 { font-size: var(--text-lg); margin-block-start: var(--space-2); }
.reading-copy { display: grid; gap: var(--space-3); max-width: 72ch; line-height: var(--leading-body); }
.step-position { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); color: var(--text-3); font-size: var(--text-sm); }
.step-dots { display: flex; gap: 4px; }
.step-dots span { width: 22px; height: 4px; border-radius: var(--radius-pill); background: var(--line-strong); }
.step-dots span.is-done { background: var(--accent); }
.english-companion { display: grid; gap: var(--space-2); padding: var(--space-4); border-radius: var(--radius-card); border-inline-start: 3px solid var(--info); background: var(--info-soft); }
.english-companion .kicker { color: var(--info); }
.english-companion p[lang="en"] { text-align: left; color: var(--text); line-height: var(--leading-body); }
.term-chips { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: var(--space-2); }
.term-chip { display: inline-flex; align-items: center; gap: var(--space-3); min-height: var(--control-height); padding: var(--space-2) var(--space-4); border: 1px solid var(--line-strong); border-radius: var(--radius-pill); background: var(--surface-1); color: var(--text); font: inherit; }
.term-chip:hover { border-color: var(--control); background: var(--surface-2); }
.term-chip span[lang="en"] { font-weight: 600; }
.term-chip span:not([lang]) { color: var(--text-2); }
.term-chip .icon { color: var(--accent); }
.symbol-guide dl { display: grid; gap: var(--space-2); margin: 0; }
.symbol-guide div { display: grid; gap: var(--space-1); padding: var(--space-3); border-radius: var(--radius-control); background: var(--surface-2); }
.symbol-guide dt { font-weight: 600; }
.symbol-guide dt span[lang="en"] { font-family: var(--font-mono); margin-inline-end: var(--space-2); color: var(--accent); }
.symbol-guide dd { margin: 0; color: var(--text-2); }
.binary-figure { margin: 0; display: grid; gap: var(--space-3); }
.binary-grid { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); gap: var(--space-1); }
.binary-grid div { display: grid; justify-items: center; gap: 2px; padding: var(--space-2) var(--space-1); border-radius: var(--radius-control); border: 1px solid var(--line); background: var(--surface-1); font-size: var(--text-xs); color: var(--text-3); }
.binary-grid div.is-included { border-color: var(--accent-line); background: var(--accent-soft); color: var(--text-2); }
.binary-grid strong, .binary-grid b { color: var(--text); font-size: var(--text-md); }
.example-task { display: grid; gap: var(--space-2); padding: var(--space-4); border-radius: var(--radius-card); border: 1px solid var(--accent-line); background: var(--accent-soft); }
.example-task p[lang="en"] { text-align: left; color: var(--text-2); }
.exam-language { display: grid; gap: var(--space-2); padding: var(--space-4); border-radius: var(--radius-card); border: 1px solid var(--line); background: var(--surface-1); }
.exam-language p[lang="en"] { text-align: left; font-weight: 500; }
.formula { display: grid; gap: var(--space-1); padding: var(--space-4); border-radius: var(--radius-control); background: var(--surface-2); font-family: var(--font-mono); font-size: .95em; overflow-x: auto; }
.formula p { margin: 0; unicode-bidi: plaintext; }
.more-explanation, .example-context { border-block-start: 1px solid var(--line); padding-block-start: var(--space-2); }
.more-explanation[open], .example-context[open] { display: grid; gap: var(--space-3); }
.original-material { display: grid; gap: var(--space-3); }
.original-passage { display: grid; gap: var(--space-2); padding: var(--space-4); border-radius: var(--radius-card); background: var(--surface-1); border: 1px solid var(--line); }
.original-passage h4 { font-size: var(--text-md); }
.original-passage .btn { justify-self: start; }
.listen { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3); border-block-start: 1px solid var(--line); padding-block-start: var(--space-3); }
.lesson-nav { display: flex; flex-wrap: wrap; gap: var(--space-3); }
@media (max-width: 767px) {
  .lesson-nav { position: sticky; bottom: 0; z-index: 20; margin-inline: calc(-1 * var(--space-4)); padding: var(--space-3) var(--space-4) max(var(--space-3), env(safe-area-inset-bottom)); background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(12px); border-block-start: 1px solid var(--line); }
  .lesson-nav .btn-primary { flex: 1; }
}
.lesson-main > .btn-quiet { justify-self: start; }
.lesson-question { display: grid; gap: var(--space-3); }
.lesson-question h2 { font-size: var(--text-xl); }
.lesson-question h2:focus { outline: none; }
.lesson-question > .btn-quiet { justify-self: start; }
.lesson-tools { display: grid; gap: var(--space-3); }
.link-button { display: flex; align-items: center; gap: var(--space-3); width: 100%; min-height: var(--control-height); padding: 0; border: 0; background: none; color: var(--text); font: inherit; text-align: start; cursor: pointer; }
.link-button:hover { color: var(--accent); }
.link-button .icon { color: var(--text-3); }
.scene-panel { padding-block: var(--space-2); }
.scene-panel > summary { color: var(--text); }
.scene-panel > summary .icon { color: var(--accent); }
.scene-panel[open] { display: grid; gap: var(--space-3); }
.scene-canvas { position: relative; width: 100%; aspect-ratio: 4 / 3; min-height: 220px; border-radius: var(--radius-card); overflow: hidden; background: var(--surface-2); }
.scene-canvas canvas { display: block; width: 100% !important; height: 100% !important; }
.scene-status { min-height: 1.5em; color: var(--text-2); font-size: var(--text-sm); }
.binary-switches { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-1); width: 100%; }
.binary-switches .btn { display: grid; justify-items: center; padding-inline: var(--space-1); }
.binary-switches .btn[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); }
.lesson-done { max-width: 760px; }
.done-mark { display: grid; place-items: center; width: 64px; height: 64px; border-radius: 50%; background: var(--success-soft); color: var(--success); border: 1px solid color-mix(in srgb, var(--success) 45%, transparent); }
.done-mark .icon { width: 30px; height: 30px; }
.lesson-done h1 { font-family: var(--font-display); font-weight: 900; font-size: var(--text-2xl); }
.lesson-done h1:focus { outline: none; }
.recap { display: grid; gap: var(--space-3); padding: var(--space-5); border-inline-start: 3px solid var(--ribbon); }
.recap h2 { font-size: var(--text-lg); }
.lesson-done > .btn-row { justify-content: center; }