/* Compact course navigation and the shared alignment of library and editors. */
.app-header, .is-learning .app-header { padding: 14px 32px; }
.main { width: auto; max-width: none; margin: 0; padding: 32px 48px 72px 112px; }
.main > .course-library-page, .main > .admin-workbench { max-width: 1480px; margin-inline: auto; }
.profile-control { display: flex; align-items: center; gap: 6px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); padding-left: 6px; }
.profile-control .avatar-upload { border: 0; background: transparent; border-radius: 50%; width: 38px; height: 38px; min-width: 38px; }
.profile-control .user-chip { border: 0; background: transparent; min-width: 0; max-width: 240px; min-height: 44px; padding: 6px 12px 6px 4px; border-radius: 0 10px 10px 0; }
.profile-control .user-chip:hover { background: var(--surface-soft); }
.profile-control .user-chip strong { white-space: normal; overflow-wrap: anywhere; }
.inline-editor-actions { justify-content: flex-end; }
.learning-back { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; }
.is-learning .main { width: 100%; margin: 0; max-width: none; padding: 24px 32px 64px; }
.is-learning .learning-layout { grid-template-columns: clamp(160px, 14.6vw, 200px) minmax(0,1fr); gap: clamp(32px,4vw,64px); }
.learning-stage { width: min(100%,760px); justify-self: center; }
.learning-step { padding-inline: 10px; gap: 8px; }
.learning-step-number { flex-basis: 16px; width: 16px; }
.lesson-progress-wrap { margin: 0 auto 36px; max-width: 100%; }
.learning-breadcrumb { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px; font-size: 13px; margin: 0 0 16px; min-width: 0; }
.learning-breadcrumb button { padding: 4px 0; min-height: 32px; font: inherit; font-weight: 400; background: transparent; color: var(--muted); overflow-wrap: anywhere; white-space: normal; min-width: 0; max-width: 100%; }
.learning-breadcrumb button:hover { color: var(--text); text-decoration: underline; }
.learning-breadcrumb > span { padding: 0; flex-shrink: 0; }
.topic-segments { justify-content: center; max-width: 320px; gap: 6px; margin: 0 auto; }
.topic-segments span { height: 3px; max-width: 64px; background: var(--line); }
.topic-segments .is-done { background: var(--accent); }
.topic-segments .is-current { background: var(--text); outline: none; }
.is-learning .learning-sidebar { position: fixed; left: 32px; top: 50dvh; transform: translateY(-50%); width: clamp(160px,14.6vw,200px); max-height: calc(100dvh - 160px); overflow-y: auto; }
.is-learning .learning-stage { grid-column: 2; }
.exercise-option.is-correct { color: var(--success); }
.exercise-option.is-wrong { color: var(--danger); }
.exercise-option.is-correct input, .exercise-option.is-wrong input { position: absolute; width: 1px; height: 1px; clip-path: inset(50%); opacity: 0; }
.exercise-result-mark { display: grid; place-items: center; width: 22px; height: 22px; flex: 0 0 22px; margin-top: 2px; border-radius: 50%; background: var(--success); color: var(--bg); }
.exercise-result-mark svg { display: block; width: 18px; height: 18px; }
.is-wrong .exercise-result-mark { background: var(--danger); }
.exercise-option:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }
.course-library-page { display: grid; gap: 28px; }
.course-library-page > .learning-layout { grid-template-columns: 260px minmax(0,1fr); gap: 28px; }
.course-library-page .learning-rail { display: grid; gap: 24px; align-self: start; }
.course-library-page .learning-hero { margin: 0; padding: 28px; gap: 32px; }
.course-library-page .learning-library { min-height: 0; padding: 24px; }
.course-library-page .learning-panel { margin: 0; }
.course-library-page .library-search { margin: 0 0 24px; }
.course-library-page .learning-group + .learning-group { margin-top: 28px; }
.course-create-layout { max-width: 1120px; margin-inline: auto; gap: 28px; }
.course-create-layout .panel { padding: 28px; }
.course-create-layout .panel-header { margin-bottom: 24px; padding: 0 0 18px; }
.course-create-layout .panel-header h3 { font-size: 22px; font-weight: 650; }
.course-create-layout .field > label, .course-create-layout label.field { font-weight: 600; color: var(--text); }
.course-create-layout .field small, .course-create-layout .check-row small { font-size: 13px; color: var(--muted); line-height: 1.6; margin-top: 8px; }
.settings-section-title { font-size: 18px; color: var(--text); margin: 28px 0 14px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.course-settings-heading { max-width: 1120px; margin: 0 auto 28px; }
.course-settings-heading h1 { font-size: 30px; margin: 0; letter-spacing: -.02em; }
.course-settings-actions { display: flex; justify-content: flex-end; gap: 12px; max-width: 1120px; margin: 28px auto 0; padding: 0; background: transparent; border: 0; position: static; }
.course-settings-actions .btn { min-height: 44px; }
.course-structure-editor { margin-bottom: 28px; padding-bottom: 28px; border-bottom: 1px solid var(--line); }
.structure-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.structure-heading h4 { margin: 0 0 8px; font-size: 18px; }
.structure-heading p { margin: 0; font-size: 14px; color: var(--muted); line-height: 1.6; max-width: 56ch; }
.topic-editor-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.topic-editor-tabs button { display: inline-flex; gap: 10px; align-items: center; padding: 12px 16px; max-width: 100%; min-height: 44px; border: 1px solid var(--line); border-radius: 8px; background: transparent; color: var(--text); text-align: left; overflow-wrap: anywhere; }
.topic-editor-tabs button.is-current { border-color: var(--accent); background: var(--accent-soft); }
.topic-editor-tabs button > span { color: var(--muted); }
.topic-settings { display: grid; grid-template-columns: minmax(0,1fr) 280px; gap: 28px; }
.topic-settings-fields { display: grid; gap: 16px; }
.topic-settings-fields .field, .chapter-editor-card > label { display: grid; gap: 8px; }
.topic-settings-fields input, .topic-settings-fields textarea, .topic-settings-fields select, .chapter-editor-card select { width: 100%; padding: 12px; min-height: 44px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--text); font: inherit; font-weight: 400; }
.topic-settings-fields textarea { min-height: 84px; resize: vertical; }
.topic-settings-fields input[type=range] { padding: 0; accent-color: var(--accent); }
.topic-image-settings p { font-size: 12px; color: var(--muted); }
.structure-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.course-overview { max-width: 1040px; margin: 16px auto 0; }
.course-overview > header { margin-bottom: 40px; max-width: 760px; }
.course-overview h1 { font-size: clamp(28px,3vw,40px); line-height: 1.2; margin: 0 0 18px; letter-spacing: -.025em; }
.course-overview > header p { color: var(--muted); font-size: 16px; line-height: 1.7; }
.course-overview > h2 { font-size: 22px; margin: 0 0 24px; }
.topic-card-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(min(100%,260px),1fr)); gap: 24px; }
.topic-card { position: relative; padding: 0; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: transparent; color: var(--text); text-align: left; }
.topic-card-lock { position: absolute; right: 20px; bottom: 20px; display: grid; place-items: center; width: 20px; height: 20px; color: var(--muted); }
.topic-card:disabled .topic-card-body > span { padding-right: 28px; }
.route-error { max-width: 760px; margin-inline: auto; }
.topic-card:hover:not(:disabled) { border-color: var(--accent); }
.topic-card:disabled { opacity: .7; }
.topic-card-image { height: 190px; width: 100%; background: var(--surface-soft); overflow: hidden; border-radius: inherit; }
.topic-card-image img { width: 100%; height: 100%; display: block; }
.topic-card-body { display: flex; flex-direction: column; gap: 32px; justify-content: space-between; min-height: 160px; padding: 20px; }
.topic-card-body h3 { margin: 0; font-size: 20px; font-weight: 550; line-height: 1.4; overflow-wrap: anywhere; }
.topic-card-body span { color: var(--muted); font-size: 13px; }
.topic-cover-empty { height: 100%; display: grid; place-items: center; color: var(--muted); }
.topic-cover-empty svg { width: 40px; height: 40px; }
.duplicate-course-button { margin-top: 28px; }
.course-navigator { position: relative; width: min(92vw,820px); min-height: min(600px,78vh); max-height: 86vh; overflow: auto; padding: 40px 52px; border: 0; border-radius: 16px; box-shadow: none; }
.outline-breadcrumb { display: flex; align-items: center; gap: 16px; padding-right: 44px; border-bottom: 1px solid var(--line); color: var(--muted); }
.outline-breadcrumb button { min-height: 48px; background: transparent; color: var(--muted); padding: 0; font-weight: 400; }
.outline-breadcrumb [aria-current] { color: var(--text); border-bottom: 1px solid var(--text); padding-block: 16px; }
.outline-close { position: absolute; top: 24px; right: 20px; display: grid; place-items: center; width: 44px; height: 44px; background: transparent; color: var(--text); }
.outline-close svg { width: 24px; height: 24px; }
.course-navigator h2 { font-size: clamp(24px,3vw,32px); line-height: 1.3; font-weight: 550; margin: 40px 0 24px; overflow-wrap: anywhere; }
.outline-list-label { color: var(--muted); font-size: 14px; margin: 0 0 16px; }
.outline-row { display: grid; grid-template-columns: 24px minmax(0,1fr) auto 12px; align-items: center; gap: 12px; width: 100%; min-height: 64px; text-align: left; padding: 16px 12px; border: 0; border-radius: 8px; background: transparent; color: var(--text); font-size: 16px; font-weight: 400; line-height: 1.5; }
.outline-row:hover:not(:disabled), .outline-row.is-current { background: var(--surface-soft); }
.outline-row:disabled { color: var(--muted); opacity: .7; }
.outline-row-title { overflow-wrap: anywhere; }
a.topic-card, a.outline-row { text-decoration: none; }
a.topic-card { display: block; font: inherit; }
.outline-row-status { color: var(--muted); font-size: 12px; }
.outline-chevron { color: var(--muted); }
@media (max-width:1100px) {
  .topic-settings { grid-template-columns: minmax(0,1fr) 220px; gap: 20px; }
  .course-library-page > .learning-layout { grid-template-columns: 220px minmax(0,1fr); gap: 24px; }
}
@media (max-width:760px) {
  .app-header, .is-learning .app-header { padding: 12px 16px; }
  .main, .is-learning .main { padding: 24px 20px 96px; width: 100%; }
  .is-learning .learning-layout, .course-library-page > .learning-layout { grid-template-columns: minmax(0,1fr); gap: 24px; }
  .learning-stage { width: 100%; }
  .is-learning .learning-sidebar { position: static; width: auto; max-height: none; transform: none; overflow: visible; }
  .is-learning .learning-stage { grid-column: auto; }
  .profile-control { gap: 0; padding-left: 0; }
  .profile-control .avatar-upload { width: 36px; min-width: 36px; height: 38px; }
  .profile-control .compact-user { width: 34px; max-width: 34px; min-width: 34px; padding: 0; }
  .profile-control .compact-user::before { font-size: 20px; }
  .lesson-progress-wrap { margin-bottom: 28px; }
  .learning-breadcrumb { font-size: 11px; gap: 6px; }
  .topic-segments { max-width: 240px; }
  .inline-editor-actions .btn { flex: 0 1 auto; }
  .course-library-page .learning-hero { padding: 22px; gap: 24px; }
  .course-library-page .learning-library { padding: 20px; }
  .course-create-layout .panel { padding: 20px; }
  .topic-settings { grid-template-columns: minmax(0,1fr); }
  .topic-image-settings { max-width: 320px; }
  .structure-heading { flex-direction: column; gap: 16px; }
  .course-settings-actions { flex-wrap: wrap; margin-top: 24px; }
  .course-navigator { width: calc(100vw - 24px); padding: 28px 20px; min-height: 64vh; }
  .course-navigator h2 { margin-top: 28px; }
  .outline-row { grid-template-columns: 18px minmax(0,1fr) auto 8px; gap: 8px; padding: 14px 8px; font-size: 15px; }
}