/* Learning surfaces share the application's palette and saved theme. */
html[data-theme] body:has(.learning-hub) { background: var(--bg); }
.learning-hub {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(20px, 4vw, 48px) clamp(18px, 4vw, 48px) 100px;
  color: var(--text-primary);
  font-family: var(--font-ui, system-ui, sans-serif);
  line-height: 1.55;
}
.learning-hub *, .learning-hub *::before, .learning-hub *::after { box-sizing: border-box; }
.learning-intro { padding: 8px 0 24px; }
.learning-context { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.learning-eyebrow { font-size: .8rem; font-weight: 600; color: var(--text-secondary); letter-spacing: .025em; }
.learning-intro h1 {
  font-family: var(--font-display, system-ui, sans-serif);
  font-size: clamp(1.8rem, 3vw, 2.35rem);
  font-weight: 600;
  line-height: 1.13;
  letter-spacing: -.03em;
  text-wrap: balance;
  max-width: 780px;
  margin: 0 0 12px;
}
.learning-intro p { margin: 0; max-width: 65ch; color: var(--text-secondary); }
.learning-hub p { overflow-wrap: anywhere; }
.learning-hub a { color: var(--accent); text-decoration: underline; text-underline-offset: 4px; }
.learning-context a { display: inline-flex; align-items: center; min-height: 44px; font-size: .85rem; }
.learning-activities {
  display: flex; gap: 4px; flex-wrap: wrap; padding-bottom: 12px;
  border-bottom: 1px solid var(--border-strong); margin: 0 0 28px;
}
.learning-hub button {
  min-width: 44px;
  min-height: 44px; padding: 10px 16px; border-radius: 9px;
  border: 1px solid var(--border-strong); background: var(--bg-card);
  color: var(--text-primary); font: inherit; font-size: .875rem;
  font-weight: 550; cursor: pointer; overflow-wrap: anywhere;
  transition: background-color .16s ease, border-color .16s ease;
  box-shadow: none;
}
.learning-hub button:hover:not(:disabled) { background: var(--bg-elevated); border-color: var(--text-muted); }
.learning-hub button:active:not(:disabled) { border-color: var(--accent); }
.learning-hub button:disabled { opacity: .6; cursor: default; }
.learning-hub button.learning-primary, .learning-hub form > button[type=submit] {
  color: var(--on-ink); background: var(--ink); border-color: var(--ink);
}
.learning-hub button.learning-primary:hover:not(:disabled), .learning-hub form > button[type=submit]:hover:not(:disabled) { opacity: .88; background: var(--ink); }
.learning-activities button { border-color: transparent; background: transparent; color: var(--text-secondary); }
.learning-activities button[aria-pressed=true] { color: var(--text-primary); background: var(--bg-card); border-color: var(--border-strong); box-shadow: inset 0 -2px var(--accent); }
.learning-hub :focus-visible { outline: 3px solid var(--focus-ring, var(--accent)); outline-offset: 3px; }
.learning-hub [hidden] { display: none !important; }
.learning-workspace { display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: 32px; align-items: start; }
.learning-workspace-main { min-width: 0; }
.learning-panel { padding: 8px 0 24px; border: 0; border-radius: 0; background: transparent; min-width: 0; }
.learning-panel h2 { font-family: var(--font-display); font-size: clamp(1.25rem, 2vw, 1.55rem); line-height: 1.3; letter-spacing: -.025em; font-weight: 650; margin: 8px 0 18px; text-wrap: pretty; }
.learning-panel h3 { font-size: 1.1rem; letter-spacing: -.015em; }
.learning-hub form { display: grid; gap: 12px; margin: 20px 0; }
.learning-hub label { font-size: .875rem; font-weight: 550; line-height: 1.5; }
.learning-hub label > input:not([type=checkbox]), .learning-hub label > select, .learning-hub label > textarea { margin-top: 8px; }
.learning-hub input:not([type=checkbox]):not([type=radio]), .learning-hub textarea, .learning-hub select {
  width: 100%; min-height: 44px; padding: 12px; border: 1px solid var(--text-muted);
  border-radius: 8px; font: inherit; font-size: .9rem; color: var(--text-primary); background: var(--bg-secondary);
}
.learning-hub textarea { resize: vertical; line-height: 1.65; }
.learning-hub input::placeholder, .learning-hub textarea::placeholder { color: var(--text-muted); opacity: 1; }
.learning-composer-actions { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; }
.learning-composer-actions label { display: block; margin-bottom: 6px; color: var(--text-secondary); font-size: .78rem; }
.learning-composer-actions select { min-width: 175px; }
.learning-composer-actions button { max-width: 250px; }
.learning-form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 16px; }
.learning-form-grid label { display: grid; align-content: start; gap: 8px; }
.learning-form-grid label > input, .learning-form-grid label > select { margin-top: 0; }
.learning-starters { display: grid; grid-template-columns: 1fr; gap: 0; margin: 16px 0 26px; border-top: 1px solid var(--border-strong); }
.learning-hub .learning-starters button { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; text-align: left; padding: 15px 0; background: transparent; border: 0; border-bottom: 1px solid var(--border-strong); border-radius: 0; }
.learning-hub .learning-starters button:hover { background: var(--bg-elevated); }
.learning-starters button > span { font-size: .83rem; font-weight: 600; line-height: 1.4; }
.learning-starters small { font-size: .75rem; font-weight: 400; color: var(--text-secondary); line-height: 1.5; }
.learning-guide { padding: 8px 0 0 24px; border-left: 1px solid var(--border-strong); }
.learning-guide h2 { font-family: var(--font-ui); font-size: 1rem; font-weight: 600; letter-spacing: -.015em; margin: 8px 0 24px; }
.learning-guide-steps { list-style: none; counter-reset: learning-steps; padding: 0; margin: 0; }
.learning-guide-steps li { padding: 0 0 18px; }
.learning-guide-steps strong { font-size: .875rem; font-weight: 600; }
.learning-guide-steps p { font-size: .85rem; color: var(--text-secondary); margin: 5px 0 0; line-height: 1.6; }
.learning-guide-links { padding: 16px 0; border-top: 1px solid var(--border-strong); }
.learning-guide-links h3 { font-size: .78rem; font-weight: 600; color: var(--text-secondary); margin: 0 0 8px; }
.learning-guide-links a { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 44px; font-size: .83rem; }
.learning-links { display: flex; flex-wrap: wrap; gap: 4px 18px; margin: 18px 0 0; padding-top: 16px; border-top: 1px solid var(--border-strong); }
.learning-links a { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; font-size: .83rem; }
.learning-note { font-size: .8rem; color: var(--text-secondary); line-height: 1.65; }
.beta-label { display: inline-block; font: 600 .7rem var(--font-ui); border: 1px solid currentColor; border-radius: 4px; padding: 2px 5px; vertical-align: middle; }
.learning-conversation { max-height: 450px; overflow: auto; overscroll-behavior: contain; }
.learning-conversation:empty { display: none; }
.learning-message { white-space: pre-wrap; overflow-wrap: anywhere; padding: 16px; margin: 12px 0; background: var(--bg-secondary); border: 1px solid var(--border-strong); border-radius: 10px; }
.learning-message[data-role=user] { margin-left: 24px; border-left: 3px solid var(--accent); }
.learning-message[data-role=assistant] { margin-right: 24px; }
.learning-message h3 { margin: 0 0 8px; color: var(--text-secondary); font: 600 .75rem var(--font-ui); }
.learning-message p { margin: 0; }
.learning-lesson { border-top: 1px solid var(--border-strong); padding: 24px 0; }
.learning-lesson h4 { font-size: 1.2rem; letter-spacing: -.025em; margin: 0 0 10px; }
.learning-lesson h5 { font-size: .875rem; margin: 24px 0 8px; text-transform: capitalize; }
.learning-lesson pre { white-space: pre-wrap; overflow-wrap: anywhere; font: inherit; font-size: .9rem; line-height: 1.8; max-width: 65ch; margin: 0; }
.learning-content { font-size: .9rem; line-height: 1.8; overflow-wrap: anywhere; min-width: 0; }
.learning-content[data-rendering=plain-text] { white-space: pre-wrap; }
.learning-content p { margin: 0 0 12px; }
.learning-content ul, .learning-content ol { padding-left: 24px; }
.learning-content .learning-content-heading { font-size: 1rem; margin: 18px 0 8px; }
.learning-content blockquote { border-left: 3px solid var(--accent); padding-left: 16px; margin: 16px 0; color: var(--text-secondary); }
.learning-content pre { max-width: 100%; overflow: auto; white-space: pre; padding: 16px; border: 1px solid var(--border-strong); background: var(--bg-secondary); border-radius: 8px; margin: 12px 0; }
.learning-content code { font-family: Consolas, 'Courier New', monospace; font-size: .9em; }
.learning-content :not(pre) > code { padding: 2px 4px; border-radius: 4px; background: var(--bg-secondary); }
.learning-content .hljs-keyword, .learning-content .hljs-selector-tag, .learning-content .hljs-built_in { color: var(--accent); font-weight: 600; }
.learning-content .hljs-comment, .learning-content .hljs-quote { color: var(--text-secondary); font-style: italic; }
.learning-content .hljs-string, .learning-content .hljs-title { color: var(--text-primary); }
.learning-content .hljs-number, .learning-content .hljs-literal { font-weight: 600; }
.learning-content table { border-collapse: collapse; width: 100%; margin: 16px 0; table-layout: fixed; }
.learning-content th, .learning-content td { border: 1px solid var(--border-strong); padding: 8px; text-align: left; overflow-wrap: anywhere; }
.learning-content th { background: var(--bg-secondary); }
.learning-content .katex-display { overflow-x: auto; overflow-y: hidden; padding: 8px 0; }
.learning-content .learning-math-source { display: inline-block; font-size: .85rem; color: var(--text-secondary); }
.learning-lesson button, #course-workspace > button, #course-library button, #sitting-controls button, #practice-preview-controls > button { margin: 4px 6px 4px 0; }
.learning-lesson > a { display: flex; align-items: center; min-height: 44px; font-size: .875rem; }
.learning-course-stages { display: flex; flex-wrap: wrap; gap: 16px; counter-reset: course-stage; padding: 16px 0; margin: 20px 0; list-style: none; border-block: 1px solid var(--border-strong); }
.learning-course-stages li { font-size: .8rem; color: var(--text-secondary); counter-increment: course-stage; }
.learning-course-stages li::before { content: counter(course-stage) '. '; font-variant-numeric: tabular-nums; }
.learning-course-stages li[aria-current=step] { color: var(--text-primary); font-weight: 650; }
.learning-outline { margin: 20px 0; padding: 16px; border: 1px solid var(--border-strong); border-radius: 8px; }
.learning-outline summary { cursor: pointer; font-weight: 600; font-size: .875rem; min-height: 44px; padding: 10px 0; }
.learning-outline label { display: block; margin: 12px 0; }
.learning-outline p { font-size: .875rem; padding: 8px 0; }
.learning-hub progress { width: 100%; height: 8px; accent-color: var(--accent); margin-bottom: 18px; }
#course-library:not(:empty), #course-workspace:not(:empty), #practice-preview { margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--border-strong); }
#course-library .learning-empty { padding: 16px; background: var(--bg-secondary); border-radius: 8px; font-size: .875rem; color: var(--text-secondary); }
.learning-consent { display: flex; align-items: flex-start; gap: 10px; min-height: 48px; padding: 8px 0; line-height: 1.5; cursor: pointer; }
.learning-consent input { flex-shrink: 0; width: 18px; height: 18px; margin: 2px 0 0; accent-color: var(--accent); }
.learning-option { display: block; padding: 10px 0; }
#hub-status:not(:empty), #admin-status:not(:empty) { padding: 14px 16px; border-left: 3px solid var(--accent); background: var(--bg-card); border-radius: 8px; white-space: pre-wrap; font-size: .875rem; }
.learning-hub fieldset { margin: 0; padding: 18px 0; border: 0; border-top: 1px solid var(--border-strong); min-width: 0; }
.learning-hub legend { padding: 0 8px 0 0; font-size: .875rem; font-weight: 650; }
.learning-policy-grid { display: grid; gap: 4px 18px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.learning-policy-grid .learning-consent { font-size: .83rem; font-weight: 450; }
.learning-organization { display: flex; align-items: center; gap: 24px; margin-bottom: 28px; padding: 20px 24px; background: var(--bg-card); border: 1px solid var(--border-strong); border-radius: 12px; }
.learning-organization > div { flex: 1; max-width: 420px; }
.learning-organization label { display: block; margin-bottom: 8px; }
.learning-organization p { font-size: .85rem; color: var(--text-secondary); }
.learning-admin-layout { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr); align-items: start; gap: 24px; }
.learning-policy-panel { grid-row: span 4; }
.learning-admin .learning-panel > p { color: var(--text-secondary); font-size: .875rem; }
#admin-members p, #admin-audit p, #admin-beta-participants p, #admin-operations p, #hub-progress > p { padding: 12px 0; margin: 0; border-bottom: 1px solid var(--border-strong); font-size: .875rem; font-variant-numeric: tabular-nums; }
#admin-audit { max-height: 260px; overflow: auto; }
@media (max-width: 1050px) {
  .learning-workspace { grid-template-columns: minmax(0, 1fr) 220px; gap: 22px; }
  .learning-starters { grid-template-columns: 1fr; }
  .learning-hub .learning-starters button { grid-template-columns: 1fr 1fr; align-items: center; }
  .learning-policy-grid { grid-template-columns: 1fr; }
}
@media (max-width: 800px) {
  .learning-workspace, .learning-admin-layout { grid-template-columns: 1fr; }
  .learning-guide { border-left: 0; border-top: 1px solid var(--border-strong); padding: 24px 0 0; }
  .learning-guide-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
  .learning-policy-panel { grid-row: auto; }
}
@media (max-width: 520px) {
  .learning-intro h1 { font-size: 2rem; }
  .learning-context { align-items: flex-start; flex-wrap: wrap; gap: 4px 12px; }
  .learning-context a { min-height: 44px; }
  .learning-hub { padding-bottom: calc(110px + env(safe-area-inset-bottom)); }
  .learning-panel { padding: 8px 0 20px; }
  .learning-activities { gap: 4px; margin-bottom: 20px; }
  .learning-activities button { flex: 1 1 auto; padding-inline: 10px; }
  .learning-composer-actions { display: grid; grid-template-columns: 1fr; }
  .learning-composer-actions button { max-width: none; width: 100%; }
  .learning-hub .learning-starters button { grid-template-columns: 1fr; gap: 4px; }
  .learning-guide-steps { display: block; }
  .learning-organization { display: block; padding: 18px; }
  .learning-form-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  .learning-hub *, .learning-hub *::before, .learning-hub *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}