.study-session {
    grid-column: 1 / -1;
    margin: 0 0 24px;
    padding: 22px 0;
    border-block: 1px solid var(--card-border, #dedee8);
    color: var(--text-primary, #111827);
    font-family: inherit;
}
.study-lesson { grid-column: 1 / -1; padding: 24px; border: 1px solid var(--card-border); border-radius: 16px; margin-bottom: 24px; }
.study-lesson[hidden] { display: none; }
.study-lesson h3 { margin: 20px 0 8px; font-size: 1rem; }
.study-lesson p { line-height: 1.65; overflow-wrap: anywhere; }
.examiner-priority { margin: 18px 0; padding: 14px 0 14px 16px; border-left: 3px solid var(--violet, #5b50e8); }
.examiner-priority h4 { margin: 0 0 6px; font-size: .88rem; }
.examiner-priority p { margin: 0; line-height: 1.55; }
.study-feedback-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.study-feedback-actions .btn-grade { width: auto; }
.study-feedback-form { margin-top: 12px; }
.study-feedback-form textarea { display: block; width: 100%; box-sizing: border-box; min-height: 90px; }
body.quiz-active #studySessionPanel { display: none; }
.study-session__heading,
.study-session__footer { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.study-session__eyebrow { margin: 0 0 6px; font-size: .72rem; font-weight: 750; letter-spacing: .065em; text-transform: uppercase; color: var(--violet, #5b50e8); }
.study-session h2 { margin: 0; font-size: 1.1rem; line-height: 1.35; font-weight: 750; }
.study-session__topic { margin: 9px 0 0; font-size: .95rem; line-height: 1.5; overflow-wrap: anywhere; }
.study-session__scope { margin: 5px 0 0; font-size: .78rem; color: var(--text-secondary, #4b5563); overflow-wrap: anywhere; }
.study-session__change { border: 0; padding: 10px 4px; min-height: 44px; flex-shrink: 0; background: none; color: var(--violet, #5b50e8); font: inherit; font-size: .8rem; font-weight: 700; cursor: pointer; }
.study-session__choices { display: flex; flex-wrap: wrap; gap: 20px 28px; margin: 20px 0; }
.study-session fieldset { min-width: 0; padding: 0; margin: 0; border: 0; }
.study-session legend { margin: 0 0 8px; padding: 0; color: var(--text-secondary, #4b5563); font-size: .78rem; font-weight: 650; }
.study-session__segments { display: flex; flex-wrap: wrap; gap: 6px; }
.study-session__segments label { position: relative; cursor: pointer; }
.study-session__segments input { position: absolute; width: 1px; height: 1px; margin: 0; opacity: 0; }
.study-session__segments span { display: flex; align-items: center; min-height: 44px; box-sizing: border-box; padding: 9px 13px; border: 1px solid var(--card-border, #dedee8); border-radius: 9px; font-size: .82rem; line-height: 1.3; color: var(--text-secondary, #4b5563); }
.study-session__segments input:checked + span { border-color: var(--violet, #5b50e8); background: var(--violet-glow, #efedff); color: var(--violet, #5b50e8); font-weight: 700; }
.study-session__segments input:focus-visible + span,
.study-session button:focus-visible { outline: 3px solid var(--violet, #5b50e8); outline-offset: 3px; }
.study-session__segments input:disabled + span { cursor: default; }
.study-session__summary { margin: 0; max-width: 480px; color: var(--text-secondary, #4b5563); font-size: .8rem; line-height: 1.5; }
.study-session__start { min-height: 44px; padding: 11px 19px; border: 1px solid transparent; border-radius: 999px; background: var(--violet, #5b50e8); color: white; font: inherit; font-size: .85rem; font-weight: 750; cursor: pointer; white-space: nowrap; }
.study-session button:disabled { cursor: default; opacity: .6; }
.study-session__status { margin: 14px 0 0; font-size: .8rem; color: var(--text-secondary, #4b5563); line-height: 1.5; }
[data-dark] .study-session__eyebrow,
[data-dark] .study-session__change,
[data-dark] .study-session__segments input:checked + span { color: var(--violet-text, #b5adff); }
[data-dark] .study-session__segments span { border-color: var(--line, #45454d); }
[data-dark] .study-session__segments input:checked + span { border-color: var(--violet-text, #b5adff); }
@media (max-width: 520px) {
    .study-session { padding-block: 18px; }
    .study-session__heading { align-items: flex-start; gap: 10px; }
    .study-session__choices { gap: 18px; }
    .study-session__footer { align-items: stretch; flex-direction: column; gap: 14px; }
    .study-session__start { width: 100%; }
}

.study-journey-status { grid-column: 1 / -1; margin: 0; font-size: .9rem; line-height: 1.6; }
.study-journey-status:empty { display: none; }
.study-scope-details { margin: 16px 0; padding: 12px 0; color: var(--text-secondary, #4b5563); font-size: .82rem; line-height: 1.6; }
.study-scope-details summary { cursor: pointer; min-height: 44px; display: flex; align-items: center; text-decoration: underline; text-underline-offset: 3px; }
.study-scope-details a { color: var(--violet, #5b50e8); text-decoration: underline; }
.study-lesson:focus, .question-card:focus { outline: 3px solid var(--violet, #5b50e8); outline-offset: 4px; }
[data-dark] .study-session, [data-dark] .study-lesson { color: var(--text-primary, #f5f5f7); }
[data-dark] .study-scope-details a { color: var(--violet-text, #b5adff); }