/* V01–V09 & U01–U20: Integrated step-repair and proposal-feedback stylesheet */
:root {
  --bg: #000;
  --panel: #090a0b;
  --surface: #111315;
  --hover: #1c1e22;
  --border: #292c31;
  --ink: #fff;
  --muted: #a9adb5;
  --faint: #858b94;
  --ice: #a5d9f4;
  --ice-bg: #12232e;
  --red: #ef7483;
  --red-bg: #2b171b;
  --green: #8fd4f7;
  --green-bg: #12232e;
  --solid: #eceef0;
  --solid-ink: #16181b;
  --home-header-height: 66px;
  --action-surface: #242c37;
  --action-hover: #343b46;
  --action-ink: #fff;
  --readable-muted: #b8c0cc;
  --placeholder-ink: #a9b2c0;
  --keyboard-focus: #b8c0cc;
  --control-border: #89919d;
}

html[data-theme="light"],
html[data-ui-theme="light"] {
  --bg: #faf9f6;
  --panel: #f2f1ed;
  --surface: #fff;
  --hover: #e7e6e1;
  --border: #d4d3cd;
  --ink: #17191c;
  --muted: #646a73;
  --faint: #6b7078;
  --ice: #215a7b;
  --ice-bg: #e2eef5;
  --red: #ae3044;
  --red-bg: #f6e2e6;
  --green: #215a7b;
  --green-bg: #e2eef5;
  --solid: #222529;
  --solid-ink: #fff;
  --action-surface: #e9eaed;
  --action-hover: #dcdfe4;
  --action-ink: #202124;
  --readable-muted: #525866;
  --placeholder-ink: #62656c;
  --keyboard-focus: #525866;
  --control-border: #767676;
}

/* UI-01..UI-07: shared readable controls, keyboard focus and required boundaries. */
:is(.context-source, #correct-observation-btn, #library-add-reference, #start-review-btn, #skip-review-btn) {
  background: var(--action-surface);
  color: var(--action-ink);
  border: 1px solid var(--control-border);
}
:is(.context-source, #correct-observation-btn, #library-add-reference, #start-review-btn, #skip-review-btn):hover {
  background: var(--action-hover);
  color: var(--action-ink);
}
.context-source :is(span, svg) { color: inherit; }
#correct-observation-btn { color: var(--learning-accent); }
:is(button.back, .menu > small, .filter-count, .right-panel svg) { color: var(--readable-muted); }
:root button.back { color: var(--readable-muted); }
:is(.question-feedback, .topic-decision, .question-thread) button:not(:disabled) { color: var(--readable-muted); }
:root :is(input, textarea)::placeholder { color: var(--placeholder-ink) !important; opacity: 1; }
:root :is(input, textarea, select, button, a, summary):focus-visible {
  outline: 2px solid var(--keyboard-focus) !important;
  outline-offset: 3px !important;
  box-shadow: none !important;
}
:root :is(input, textarea, select):focus-visible {
  outline: none !important;
  border-color: var(--control-border) !important;
}
:root :is(input:not([type="file"]), textarea, select),
.composer, .chat-composer, .library-search,
.learning-view .lesson-actions button, .intake-actions button,
.library-tabs button, .existing-reference-row, .checkpoint-trigger,
.auth-submit, .auth-button.login {
  border: 1px solid var(--control-border);
}
:root textarea.goal, :root .chat-composer textarea, :root .library-search input { border: 0; }
.dialog-error { color: var(--red); padding: 12px; border: 1px solid currentColor; border-radius: 10px; }
#dialog-body #modal-propose-revision { background: var(--surface-raised); color: var(--ink); border: 1px solid var(--line); }
#dialog-body #modal-propose-revision:hover { box-shadow: inset 0 0 0 1px var(--muted); }
.lesson-recap { margin: 16px 0; padding: 0; border: 0; }
.lesson-recap > summary { font-size: 16px; min-height: 44px; align-items: center; }

@media (max-width: 600px) {
  :root :is(button, input:not([type="hidden"]), select, summary), .language-choice {
    min-width: 44px;
    min-height: 44px;
  }
  :root :is(input, textarea, .lesson-copy, .lesson-copy p, .rendered-copy, .source-preview, .empty p, .chat-message p) {
    font-size: 16px;
    line-height: 1.5;
  }
  :root :is(small, label, .meta-pill, .concept-pill, .grounding-badge, .filter-count, .history-window-note,
    .sheet-heading, .line-label, .flag-tag, .micro-step strong, .episode-eyebrow, .sample-note, .resource-meta, .resource-action) {
    font-size: 12px;
    line-height: 1.4;
  }
  :root .reasoning-add { width: 44px; height: 44px; }
  :root input { max-width: 100%; min-width: 0; }
  :root input:not([type="hidden"]) { min-height: 44px; }
}

main {
  --learning-accent: #8fd4f7;
  --learning-primary: #8fd4f7;
  --learning-primary-ink: #10212c;
  --learning-line: #354751;
}

html[data-theme="light"] main,
html[data-ui-theme="light"] main {
  --learning-accent: #215a7b;
  --learning-primary: #c5e9fc;
  --learning-primary-ink: #123449;
  --learning-line: #aec6d2;
}

/* V02: Docked stage strip inside .main-header.has-stages */
.main-header.has-stages {
  display: grid !important;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 4px 12px;
  height: auto !important;
  min-height: 100px;
  padding-top: 12px;
  padding-bottom: 0;
  border-bottom: 1px solid var(--learning-line);
}

.main-header #page-label {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.main-header.has-stages .stages {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  height: 40px;
  min-height: 40px;
  margin: 0;
  border: 0;
  gap: 16px;
  font-size: 13px;
}

.main-header.has-stages .stages > button,
.main-header.has-stages .stages > span:not(.counter) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-width: 58px;
  height: 40px;
  padding: 0 8px;
  color: var(--muted);
  border-radius: 0;
  background: none !important;
}

.main-header.has-stages .stages .active {
  color: var(--learning-accent);
  font-weight: 600;
}

.main-header.has-stages .stages .active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  background: var(--learning-accent);
}

.main-header.has-stages .stages .counter {
  margin-left: auto;
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}

.examples {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.examples button {
  min-height: 36px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 12px;
  color: var(--muted);
  background: var(--surface);
}

.file-mark {
  display: inline-grid;
  place-items: center;
  position: relative;
  width: 24px;
  height: 24px;
  flex: none;
}

.file-mark svg {
  width: 20px;
  height: 20px;
}

.file-mark b {
  position: absolute;
  bottom: 1px;
  left: 0;
  right: 0;
  font-size: 6px;
  line-height: 8px;
  text-align: center;
  background: var(--surface);
  font-weight: 700;
}

/* V06 & V09: Home first-screen layout, centered title, no subtitle, viewport-bottom border */
body.home-route .hero {
  padding-top: 0 !important;
  padding-bottom: 48px !important;
  min-height: calc(100svh - var(--home-header-height)) !important;
}

.home-first-screen {
  min-height: calc(100svh - var(--home-header-height));
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 28px 0 36px;
  border-bottom: 1px solid var(--border);
}

.home-first-screen .intro {
  text-align: center;
  margin: 0 auto 28px !important;
  width: 100%;
}

.home-first-screen h1,
body.home-route .hero .intro h1 {
  text-align: center !important;
  margin: 0 auto !important;
  font-size: clamp(36px, 4.2vw, 48px);
  line-height: 1.12;
  letter-spacing: -1.8px;
  font-weight: 600;
}

body.home-route .hero .intro .sub,
body.home-route .hero .intro .eyebrow,
.home-subtitle {
  display: none !important;
}

.home-first-screen .compose-wrap {
  width: 100%;
  max-width: 780px;
  margin: 0 auto !important;
}

.home-first-screen .secondary {
  margin: -12px auto 0;
  padding-top: 12px;
  border-radius: 0 0 22px 22px;
}

.home-first-screen .examples { justify-content: center; }

.resume-learning {
  max-width: 780px;
  margin: 0 auto;
  padding: 32px 0 56px;
}

.resume-learning .section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-size: 13px;
  color: var(--muted);
}

/* Removable selected reference chip on Home */
.attachment-chip {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  gap: 6px;
  margin: 6px 0;
  padding: 2px 4px 2px 8px;
  min-height: 32px;
  background: var(--surface);
}

.attachment-chip > button:first-child {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  color: var(--ink);
  justify-content: flex-start;
  max-width: 260px;
  padding: 2px 4px;
  border-radius: 5px;
  min-width: 0;
}

.attachment-chip span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.attachment-chip .remove {
  width: 28px;
  height: 28px;
  min-width: 28px;
  border-radius: 6px;
  display: inline-grid;
  place-items: center;
  color: var(--muted);
}

.attachment-chip .remove svg {
  width: 14px;
  height: 14px;
}

/* Existing reference picker dialog */
.existing-reference-list {
  display: grid;
  gap: 8px;
  margin-top: 12px;
  max-height: 46svh;
  overflow-y: auto;
}

.existing-reference-row {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  text-align: left;
}

.existing-reference-row > span:nth-child(2) {
  min-width: 0;
  flex: 1;
}

.existing-reference-row strong {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.existing-reference-row small {
  display: block;
  font-size: 11px;
  color: var(--muted);
}

.existing-reference-row em {
  font-style: normal;
  font-size: 12px;
  color: var(--ice);
  white-space: nowrap;
}

.existing-reference-row[aria-pressed="true"] {
  border-color: var(--ice);
  background: var(--ice-bg);
}

.existing-reference-row[aria-pressed="true"] em {
  font-weight: 600;
}

/* V02: Course context line */
.context-line {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  min-height: 36px;
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 12px;
}

.context-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
  color: var(--ink);
}

.context-item svg {
  width: 16px;
  height: 16px;
  color: var(--muted);
}

.context-sep {
  color: var(--faint);
}

.context-source {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 32px;
  padding: 4px 9px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--muted);
  font-size: 12px;
}

/* V04 & V05: Micro-path, Work sheet, Lining numerals, and Operator <mark> */
.eyebrow-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.episode-eyebrow {
  margin: 0;
  font-size: 12px;
  font-weight: 600;
  color: var(--learning-accent);
}

.micro-path {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  padding: 0 0 18px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--learning-line);
}

.micro-step {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  color: var(--faint);
  font-size: 13px;
}

.micro-step span {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  font-size: 11px;
}

.micro-step.active {
  color: var(--learning-accent);
  font-weight: 600;
}

.micro-step.active span {
  border-color: var(--learning-accent);
  background: var(--ice-bg);
  color: var(--learning-accent);
}

.micro-step.done {
  color: var(--ink);
}

.micro-step.done span {
  border-color: var(--green);
  background: var(--green-bg);
  color: var(--green);
}

.work-sheet {
  margin: 22px 0;
  padding: 20px 22px;
  border: 1px solid var(--learning-line);
  border-radius: 14px;
  background: var(--surface);
}

.sheet-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
  font-size: 12px;
  color: var(--muted);
}

.equation-stack {
  display: grid;
  gap: 10px;
}

.work-line {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 11px 13px;
  border: 1px solid transparent;
  border-radius: 11px;
}

.work-line.flagged {
  border-color: color-mix(in srgb, var(--red) 48%, transparent);
  background: var(--red-bg);
}

.line-label {
  font-size: 12px;
  color: var(--muted);
}

.equation-ink {
  margin: 0;
  font-family: 'Times New Roman', serif;
  font-size: 27px;
  line-height: 1.4;
  letter-spacing: 0;
  font-variant-numeric: lining-nums tabular-nums;
  font-feature-settings: "lnum" 1, "tnum" 1;
}

.work-line.flagged .equation-ink mark {
  font: inherit;
  line-height: inherit;
  vertical-align: baseline;
  background: color-mix(in srgb, var(--red) 28%, transparent);
  color: var(--ink);
  padding: 1px 6px;
  border-radius: 6px;
  border-bottom: 2px solid var(--red);
}

.flag-tag {
  grid-column: 2;
  justify-self: start;
  font-size: 11px;
  font-weight: 600;
  color: var(--red);
  background: var(--surface);
  border: 1px solid color-mix(in srgb, var(--red) 42%, transparent);
  border-radius: 999px;
  padding: 3px 9px;
}

.observation-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 14px;
  margin: 16px 0 22px;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--panel);
}

.correction-note {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

.quiet-link {
  min-height: 36px;
  padding: 6px 10px;
  border-radius: 8px;
  color: var(--learning-accent);
  font-size: 12px;
  font-weight: 500;
}

.hint-card {
  padding: 13px 15px;
  margin: 14px 0;
  border: 1px solid var(--learning-line);
  border-radius: 11px;
  background: var(--ice-bg);
  font-size: 14px;
  line-height: 1.6;
}

.result-summary {
  margin: 22px 0;
  padding: 22px;
  border: 1px solid var(--learning-line);
  border-radius: 14px;
  background: var(--surface);
}

.outcome-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 28px;
  padding: 4px 10px;
  margin-bottom: 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}

.outcome-badge svg {
  width: 15px;
  height: 15px;
}

.outcome-badge.independent {
  background: var(--green-bg);
  color: var(--green);
}

.outcome-badge.assisted {
  background: var(--ice-bg);
  color: var(--learning-accent);
}

.evidence-list {
  margin: 14px 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.75;
}

.caveat-note {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
}

/* V07, V08, V09: Operation-scoped waiting row, inline error recovery, and Need help? button */
#operation-feedback {
  min-height: 0;
  margin: 12px 0;
}

.thinking {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 28px;
  margin: 12px 0;
  font-size: 13px;
  color: var(--muted);
}

.thinking-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
  animation: pulse 1.3s ease-in-out infinite;
}

.operation-error {
  padding: 12px;
  border: 1px solid color-mix(in srgb, var(--red) 38%, transparent);
  border-radius: 10px;
  background: var(--red-bg);
  font-size: 14px;
  line-height: 1.5;
  margin: 12px 0;
}

.operation-error .error-top {
  display: flex;
  gap: 8px;
  align-items: flex-start;
}

.operation-error .error-top svg {
  width: 16px;
  height: 16px;
  color: var(--red);
  margin-top: 3px;
  flex: none;
}

.operation-error .error-top p {
  margin: 0;
}

.operation-error .error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0 0 24px;
}

.operation-error .error-actions button {
  font-size: 12px;
  min-height: 32px;
  padding: 5px 11px;
  border-radius: 7px;
  background: var(--surface);
  border: 1px solid var(--border);
}

#need-help-btn,
#open-demo-help {
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid #fff;
  background: #fff !important;
  color: #000 !important;
  font-size: 14px;
  font-weight: 500;
  margin-top: 8px;
}

#need-help-btn:hover:not(:disabled),
#open-demo-help:hover:not(:disabled) {
  background: #e5e5e5 !important;
  color: #000 !important;
  border-color: #e5e5e5;
  filter: none;
}

/* Library & Activity enhancements */
.library-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.library-title-row h1 {
  margin-bottom: 0 !important;
}

.filter-count {
  margin-left: 6px;
  font-size: 11px;
  color: var(--readable-muted);
}

.resource-action {
  align-self: center;
  font-style: normal;
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  margin-left: auto;
}

.history-window-note {
  font-size: 12px;
  color: var(--muted);
  margin-left: auto;
}

/* Save button dirty state & unsaved modal */
#save-profile.dirty {
  background: var(--green-bg) !important;
  color: var(--green) !important;
  border-color: color-mix(in srgb, var(--green) 42%, transparent) !important;
}

.stacked-actions {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.stacked-actions button {
  height: 46px;
  width: 100%;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 500;
  justify-content: center;
}

.stacked-actions .keep-editing {
  background: var(--solid);
  color: var(--solid-ink);
}

.stacked-actions .discard {
  background: var(--red-bg);
  color: var(--red);
}

.stacked-actions .confirm-save {
  background: #287342;
  color: #fff;
}

@media (max-width: 799px) {
  .main-header.has-stages {
    min-height: 104px;
    padding-left: 14px !important;
    padding-right: 14px !important;
  }
  .main-header.has-stages #page-label {
    max-width: 140px;
  }
  .main-header.has-stages .stages {
    gap: 8px;
  }
  .main-header.has-stages .stages > button,
  .main-header.has-stages .stages > span:not(.counter) {
    min-width: 44px;
    padding: 0 5px;
    font-size: 12px;
  }
  .main-header.has-stages .stages .counter {
    display: none;
  }
  .work-line {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .flag-tag {
    grid-column: 1;
  }
  .equation-ink {
    font-size: 25px;
  }
  .micro-path {
    gap: 10px;
  }
  .history-window-note {
    width: 100%;
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .thinking-dot {
    animation: none !important;
  }
}

/* Personal-learning workflow: compact intake, hierarchical curriculum, candidate revision, export offer & spaced review */
.intake-card,
.grounding-banner,
.prerequisite-bridges,
.module-card,
.enrichment-box,
.review-opp-box,
.pending-revision-card,
.export-offer-card,
.spaced-review-card,
.direct-answer-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  padding: 18px 20px;
  margin: 16px 0;
}

.intake-card h2,
.module-card h2,
.pending-revision-card h2 {
  font-size: 18px;
  line-height: 1.35;
  margin: 0 0 8px;
}

.intake-known {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0 14px;
}

.intake-badge,
.grounding-badge,
.concept-pill,
.section-pill,
.meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  line-height: 1.4;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
}

.grounding-badge.source_grounded {
  background: var(--green-bg);
  color: var(--green);
  border-color: var(--green);
}

.grounding-badge.partial_source {
  background: var(--ice-bg);
  color: var(--ice);
  border-color: var(--ice);
}

.grounding-badge.unverified_general {
  background: var(--panel);
  color: var(--muted);
}

.intake-grid {
  display: grid;
  gap: 14px;
  margin-top: 12px;
}

.intake-field label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 6px;
}

.intake-field input,
.intake-field textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  padding: 10px 12px;
  font-size: 14px;
}

.intake-actions,
.banner-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 16px;
}

.intake-primary-actions { display: flex; gap: 10px; margin-left: auto; flex-wrap: wrap; }
.intake-actions > button, .intake-primary-actions > button {
  width: auto; height: auto; min-height: 40px; margin: 0; padding: 10px 16px;
  border-radius: 10px; display: inline-flex; align-items: center; justify-content: center; gap: 8px;
}
.intake-actions .intake-skip { background: #b92e40; color: #fff; }
.intake-actions .intake-skip:hover { background: #a12435; }
.intake-attach svg { width: 18px; height: 18px; flex-shrink: 0; }
.intake-secondary-actions { margin-top: 12px; }

.module-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.module-lessons {
  display: grid;
  gap: 12px;
  margin-top: 12px;
}

.lesson-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
  padding: 14px 16px;
}

.lesson-card :is(h2,h3) {
  font-size: 15px;
  margin: 0 0 6px;
}

.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.pending-revision-card,
.spaced-review-card,
.export-offer-card {
  border-color: var(--learning-line);
}

.export-format-links {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
}

.export-format-links a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--ink);
  font-size: 13px;
  text-decoration: none;
}

/* Owner Library reference: compact toolbar and file cards; theme covers full canvas. */
:root { background: var(--ground); min-height: 100%; }
body { min-height: 100svh; }
body.overview-page main { min-height: 100svh; }
body.overview-page #page-label { display: none; }
body.overview-page .learning-view { max-width: 1600px; margin: 24px auto; padding: 0 32px 48px; }
.library-title-row { flex-wrap: nowrap; margin-bottom: 24px; }
.library-title-row h1 { margin: 0 !important; flex: 1; font-size: 32px; }
.library-toolbar { display: flex; gap: 12px; align-items: center; }
.library-toolbar .library-search { margin: 0; width: min(360px, 30vw); border-radius: 28px; }
.library-toolbar button { margin: 0; min-height: 44px; white-space: nowrap; }
#library-layout { background: var(--action-surface); color: var(--action-ink); min-width: 44px; }
#library-layout:hover { background: var(--action-hover); }
#library-add-reference { width: auto; padding: 10px 20px; border-radius: 24px; }
.library-shell .library-tabs { margin: 20px 0 24px; }
.library-shell .library-tabs button { border: 0; border-radius: 24px; }
.library-shell[data-layout="grid"] .resource-list { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 20px; border: 0; }
.library-shell[data-layout="grid"] .resource-row { display: grid; grid-template-columns: 32px minmax(0,1fr); grid-template-rows: auto auto 1fr; gap: 10px; align-items: start; padding: 18px; min-height: 280px; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); }
.library-shell .resource-row > div { min-width: 0; }
.library-shell .resource-row strong { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.library-shell[data-layout="grid"] .resource-action { grid-column: 2; margin: 0; font-size: 12px; }
.resource-preview { display: none; }
.library-shell[data-layout="grid"] .resource-preview { grid-column: 1 / -1; display: grid; place-items: center; min-height: 150px; margin: 0; }
.resource-preview .file-mark { transform: scale(2); }
.library-shell .file-mark.pdf { color: #e74949; }
.library-shell .file-mark.docx { color: #138bd9; }
.library-shell .file-mark.md { color: var(--ink); }
.library-shell .file-mark svg { color: inherit; }
:root[data-ui-theme="light"] .library-shell .file-mark.pdf { color: #b92e40; }
:root[data-ui-theme="light"] .library-shell .file-mark.docx { color: #0968a6; }
.library-shell .empty, .library-shell .operation-error { grid-column: 1 / -1; }
.activity-filter > div { display: flex; align-items: center; gap: 12px; }
.activity-filter > div :is(input, button) { margin: 0; height: 44px; min-height: 44px; width: auto; }
.activity-filter input { min-width: 0; }
.activity-filter button { flex-shrink: 0; }
.intake-prefill-note { color: var(--readable-muted); }
@media(max-width:1100px) { .library-shell[data-layout="grid"] .resource-list { grid-template-columns: repeat(3,minmax(0,1fr)); } }
@media(max-width:800px) { .library-shell[data-layout="grid"] .resource-list { grid-template-columns: repeat(2,minmax(0,1fr)); } .library-title-row { flex-wrap: wrap; } .library-toolbar { width:100%; } .library-toolbar .library-search { flex:1; width:auto; } }
@media(max-width:480px) { body.overview-page .learning-view { padding:0 16px 32px; } .library-shell[data-layout="grid"] .resource-list { grid-template-columns: 1fr; } }

:root {
  --sidebar-width: 252px;
  --right-panel-width: 310px;
  --cram-crimson: #ed3e65;
  --cram-bg: rgba(237, 62, 101, .14);
  --cram-border: rgba(237, 62, 101, .55);
}
:root[data-ui-theme="light"] {
  --cram-crimson: #b41f43;
  --cram-bg: rgba(180, 31, 67, .10);
  --cram-border: rgba(180, 31, 67, .45);
}
.compose-wrap .secondary { gap: 8px; }
.secondary #source-state { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.compose-wrap .cramming-toggle, .examples .cramming-starter {
  color: var(--cram-crimson); border: 1px solid var(--cram-border); background: var(--ground);
  border-radius: 18px; min-height: 44px; padding: 8px 12px;
}
.compose-wrap .cramming-toggle { display: inline-flex; align-items: center; justify-content: center; gap: 4px; margin-left: auto; flex-shrink: 0; height: 36px; min-height: 36px; padding: 0 8px; font-size: 13px; }
@media(max-width:600px) { .compose-wrap .cramming-toggle { height: 44px; min-height: 44px; } }
.cramming-toggle svg { width: 18px; height: 18px; transition: transform .2s ease; }
.cramming-toggle:hover svg { transform: rotate(-12deg) scale(1.08); }
.compose-wrap .cramming-toggle:hover, .examples .cramming-starter:hover,
.compose-wrap .cramming-toggle[aria-pressed="true"] { background: linear-gradient(var(--cram-bg), var(--cram-bg)), var(--ground); box-shadow: inset 0 0 0 1px var(--cram-border); }
.cram-activate { animation: cram-snap .55s cubic-bezier(.2,.8,.2,1); }
.home-route.cramming-active .composer { border-color: var(--cram-border); animation: cram-perimeter 2.2s ease-in-out infinite; }
.cramming-scope { border-color: var(--cram-border); }
.cramming-scope h2 { color: var(--cram-crimson); }
.cramming-scope #submit-intake-btn { background: linear-gradient(var(--cram-bg), var(--cram-bg)), var(--ground); color: var(--cram-crimson); border-color: var(--cram-border); }
.module-level { font-size: 12px; border: 1px solid var(--learning-line); background: var(--ice-bg); color: var(--learning-accent); border-radius: 16px; padding: 4px 10px; }
.module-head { flex-wrap: wrap; }
@keyframes cram-snap {
  0% { transform: scale(.94); box-shadow: 0 0 0 0 var(--cram-border); }
  45% { transform: scale(1.04); }
  100% { transform: scale(1); box-shadow: 0 0 0 12px transparent; }
}
@keyframes cram-perimeter {
  0%,100% { box-shadow: 0 0 0 1px var(--cram-bg), 0 0 12px var(--cram-bg); }
  50% { box-shadow: 0 0 0 2px var(--cram-border), 0 0 22px var(--cram-bg); }
}
body { --occupied-left: 0px; --effective-right-width: min(var(--right-panel-width), max(240px, calc(100vw - var(--occupied-left) - 320px))); }
@media(min-width:761px) {
  body.workspace-signed { --occupied-left: calc(64px + var(--sidebar-width)); }
  body.workspace-signed.collapsed { --occupied-left: 64px; }
  .sidebar { width: var(--sidebar-width); }
  .workspace-signed:not(.collapsed):not(.overview-page) main { margin-left: calc(64px + var(--sidebar-width)); }
}
@media(min-width:1051px) {
  .right-panel { width: var(--effective-right-width); }
  .pattern-open:not(.overview-page) main { margin-right: var(--effective-right-width); }
}
.panel-resizer { position: absolute; top: 0; bottom: 0; width: 10px; z-index: 10; touch-action: none; cursor: ew-resize; }
.sidebar-resizer { right: 0; }
.right-panel-resizer { left: 0; }
.panel-resizer:hover, .panel-resizer:focus-visible { background: var(--hover); outline: 2px solid var(--keyboard-focus); outline-offset: -3px; }
.is-resizing, .is-resizing * { cursor: ew-resize !important; user-select: none !important; }
.is-resizing :is(main, .sidebar, .right-panel) { transition: none !important; }
@media(max-width:760px) { .sidebar-resizer { display: none; } }
@media(max-width:1050px) { .right-panel-resizer { display: none; } }
@media(prefers-reduced-motion:reduce) {
  .cram-activate, .home-route.cramming-active .composer { animation: none; }
  .cramming-toggle:hover svg { transform: none; transition: none; }
}

/* Owner palette correction: save and positive states use ice; submission uses crimson. */
.save-pattern.unsaved, .confirm-save.unsaved {
  background: #8fd4f7 !important; color: #10212c !important; border-color: #8fd4f7 !important;
}
.save-pattern.unsaved:hover, .confirm-save.unsaved:hover { background: #b5e4fb !important; }
dialog.discard-dialog .confirm-save.unsaved, :root[data-ui-theme="light"] .discard-dialog .confirm-save.unsaved {
  background: var(--ice-bg) !important; color: var(--ice) !important; border-color: transparent !important;
}
.learning-view .attempt-submit, dialog .attempt-submit {
  background: #b41f43 !important; color: #fff !important; border-color: #ed3e65 !important;
}
.learning-view .attempt-submit:hover, dialog .attempt-submit:hover { background: #941936 !important; }
.account-dock .avatar { background: #215a7b; color: #fff; }

.home-first-screen .secondary { background: var(--ground); border: 1px solid #fff; }
:root[data-ui-theme="light"] .home-first-screen .secondary { border-color: #343840; }
.compose-wrap .personalize {
  display: inline-flex; align-items: center; justify-content: center; gap: 4px;
  height: 36px; padding: 0 8px; border: 1px solid #8fd4f7; border-radius: 18px;
  color: #8fd4f7; background: var(--ground); font-size: 13px;
}
.compose-wrap .personalize svg { width: 18px; height: 18px; }
.compose-wrap .personalize:hover { background: #12232e; }
:root[data-ui-theme="light"] .compose-wrap .personalize { color: #215a7b; border-color: #215a7b; }
:root[data-ui-theme="light"] .compose-wrap .personalize:hover { background: #e2eef5; }
.home-first-screen .examples::before { content: ''; flex-basis: 100%; height: 0; order: 1; }
.home-first-screen .examples .cramming-starter { order: 2; }
@media(max-width:600px) { .compose-wrap .personalize { height: 44px; } }

.examples [data-starter] { transition: transform .2s ease, background-color .2s ease, border-color .2s ease, color .2s ease; }
.examples [data-starter]:hover { transform: translateY(-3px); background: var(--hover); border-color: var(--ice); color: var(--ink); }
.examples [data-starter]:active { transform: translateY(-1px); }
@media(prefers-reduced-motion:reduce) { .examples [data-starter] { transition: none; } .examples [data-starter]:hover, .examples [data-starter]:active { transform: none; } }

/* Shared feedback also covers buttons created by menus, dialogs and course stages. */
:root :is(button, [role="button"]) {
  transition-property: background-color, color, border-color, box-shadow, filter, transform;
  transition-duration: .18s;
  transition-timing-function: ease;
}
@media(hover:hover) {
  :root :is(button, [role="button"]):not(:disabled):not([aria-disabled="true"]):not(.language-choice):hover {
    filter: brightness(1.12);
    box-shadow: inset 0 0 0 1px var(--control-border);
  }
  :root[data-ui-theme="light"] :is(button, [role="button"]):not(:disabled):not([aria-disabled="true"]):not(.language-choice):hover { filter: brightness(.95); }
}
@media(prefers-reduced-motion:reduce) {
  :root :is(button, [role="button"]) { transition: none !important; }
}

/* Decorative notebook is fixed behind the workspace; side panels cover its edges. */
.workspace-book { position: fixed; z-index: 0; left: 50%; top: 50%; width: min(1800px, 135vw); aspect-ratio: 5 / 4; transform: translate(-50%, -50%); pointer-events: none; opacity: .30; filter: blur(2px); }
.workspace-book > svg { display: block; width: 100%; height: 100%; }
body.workspace-signed main { position: relative; z-index: 1; background: transparent; }
body.workspace-signed .main-header { background: rgba(0, 0, 0, .18); backdrop-filter: blur(8px); }
:root[data-ui-theme="light"] body.workspace-signed .main-header { background: rgba(255, 255, 255, .18); }
body.workspace-signed:not(.home-route) .workspace-book { opacity: .12; filter: blur(7px); }
body:not(.workspace-signed) .workspace-book { display: none; }
:root[data-ui-theme="light"] .workspace-book { opacity: .15; }
:root[data-ui-theme="light"] body.workspace-signed:not(.home-route) .workspace-book { opacity: .08; }
@media(prefers-reduced-motion:reduce) { .workspace-book, .workspace-book * { animation: none !important; transition: none !important; } }

.plan-learner-targets, .module-lesson-outcome { list-style: disc; padding-left: 20px; margin: 10px 0 22px; display: flex; flex-direction: column; gap: 6px; }
:root .plan-learner-targets li, :root .plan-learner-targets li p, :root .plan-learner-targets .rendered-copy,
:root .module-lesson-outcome li, :root .module-lesson-outcome li p {
  font-size: 13px; line-height: 1.5; color: var(--readable-muted, #a6b1c0);
}
.plan-learner-targets li p, .module-lesson-outcome li p { margin: 0; font-size: inherit; line-height: inherit; color: inherit; }