/* KBatch Learn — skill ladder + drill (theme-aware) */

.learn-body {
  min-height: 100vh;
  background: var(--bg, #0a0c10);
  color: var(--ink, #e6edf3);
}

.learn-main {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(320px, 1.2fr);
  gap: 16px;
  padding: 12px 16px 40px;
  max-width: 1200px;
  margin: 0 auto;
}

@media (max-width: 860px) {
  .learn-main {
    grid-template-columns: 1fr;
  }
}

.learn-panel {
  border: 1px solid var(--line, #30363d);
  border-radius: 12px;
  /* --panel is not defined in app.css; use elevated card tokens */
  background: var(--bg-elev, var(--bg-card, #161b22));
  color: var(--ink, #e6edf3);
  padding: 14px;
  min-width: 0;
}

.learn-surface-links {
  margin-top: 6px;
  font-size: 0.82rem;
}
.learn-surface-links a {
  color: var(--accent, #58a6ff);
  text-decoration: none;
}
.learn-surface-links a:hover {
  text-decoration: underline;
}
.learn-path-hint,
.learn-filter-empty {
  margin: 0 0 12px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line, #30363d);
  background: color-mix(in srgb, var(--accent, #58a6ff) 8%, transparent);
  font-size: 0.85rem;
  color: var(--ink, #e6edf3);
}
.learn-path-hint a,
.learn-filter-empty a {
  color: var(--accent, #58a6ff);
}
.learn-body .export-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}
.learn-toast {
  position: fixed;
  left: 50%;
  bottom: calc(18px + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%) translateY(120%);
  z-index: 80;
  max-width: min(92vw, 420px);
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--line, #30363d);
  background: var(--bg-elev, #161b22);
  color: var(--ink, #e6edf3);
  font-size: 0.85rem;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.learn-toast.is-on {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}
.learn-toast.is-ok {
  border-color: color-mix(in srgb, var(--green, #3fb950) 55%, var(--line));
}
.learn-toast.is-bad {
  border-color: color-mix(in srgb, #f85149 55%, var(--line));
}
@media (max-width: 640px) {
  .learn-body .export-bar .btn {
    min-height: 40px;
    font-size: 0.82rem;
  }
}

.learn-panel .panel-head h2 {
  margin: 0 0 4px;
  color: var(--ink, #e6edf3);
}

.learn-panel .panel-head p {
  margin: 0;
  color: var(--faint, #8b949e);
}

.learn-subject h3 {
  margin: 12px 0 8px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--faint, #8b949e);
}

/* Accreditation chrome · collapsible linked areas (not tag chips) */
.acc-chrome,
.acc-chrome--areas {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0 0 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line, #30363d);
}

/* CEFR spine · linked nodes, not pills */
.acc-tier-spine {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 0;
  padding: 4px 0 2px;
}
.acc-tier-node {
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding: 6px 8px;
  min-width: 2.6rem;
  border: 1px solid var(--line, #30363d);
  background: var(--bg, #0d1117);
  color: var(--muted, #c9d1d9);
  font: 700 0.58rem/1.15 system-ui;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.acc-tier-node:first-child {
  border-radius: 8px 0 0 8px;
}
.acc-tier-node:last-of-type {
  border-radius: 0 8px 8px 0;
}
.acc-tier-r {
  color: var(--accent, #58a6ff);
  font-size: 0.62rem;
}
.acc-tier-c {
  font-size: 0.7rem;
  color: var(--ink, #e6edf3);
  letter-spacing: 0.02em;
}
.acc-tier-a {
  font-size: 0.55rem;
  color: var(--faint, #8b949e);
  font-weight: 600;
  text-transform: none;
}
.acc-tier-link {
  width: 10px;
  align-self: center;
  height: 2px;
  background: color-mix(in srgb, var(--accent, #58a6ff) 45%, var(--line));
  flex: 0 0 auto;
}

/* Collapsible section folds */
.acc-fold {
  border: 1px solid var(--line, #30363d);
  border-radius: 12px;
  background: color-mix(in srgb, var(--bg-elev, #161b22) 88%, var(--bg, #0d1117));
  overflow: hidden;
}
.acc-fold + .acc-fold {
  margin-top: 0;
}
.acc-fold-summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 8px;
  align-items: center;
  padding: 11px 12px;
  user-select: none;
  color: var(--ink, #e6edf3);
}
.acc-fold-summary::-webkit-details-marker {
  display: none;
}
.acc-fold-summary::before {
  content: "▸";
  color: var(--faint, #8b949e);
  font-size: 0.72rem;
  width: 0.9rem;
}
.acc-fold[open] > .acc-fold-summary::before {
  content: "▾";
}
.acc-fold-title {
  font: 700 0.78rem/1.25 system-ui;
  letter-spacing: 0.02em;
}
.acc-fold-hint {
  font: 600 0.62rem/1 system-ui;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--faint, #8b949e);
}
.acc-fold[open] > .acc-fold-summary .acc-fold-hint {
  visibility: hidden;
}
.acc-fold-body {
  padding: 0 10px 12px;
  border-top: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
}

/* Linked area stack · vertical rail of choices */
.acc-area-stack {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 8px;
  border-left: 2px solid color-mix(in srgb, var(--accent, #58a6ff) 35%, var(--line));
  padding-left: 0;
}
.acc-area {
  appearance: none;
  width: 100%;
  cursor: pointer;
  display: grid;
  grid-template-columns: 4px 1fr auto;
  gap: 0 10px;
  align-items: center;
  text-align: left;
  border: 1px solid var(--line, #30363d);
  border-left: none;
  border-radius: 0;
  background: var(--bg, #0d1117);
  color: var(--ink, #e6edf3);
  padding: 10px 12px 10px 0;
  font: inherit;
  margin: 0;
  transition: background 0.12s, border-color 0.12s;
}
.acc-area:first-child {
  border-radius: 0 10px 0 0;
}
.acc-area:last-child {
  border-radius: 0 0 10px 0;
}
.acc-area + .acc-area {
  border-top: none;
}
.acc-area-rail {
  width: 4px;
  align-self: stretch;
  min-height: 100%;
  background: color-mix(in srgb, var(--acc-color, var(--accent)) 55%, transparent);
  border-radius: 0 2px 2px 0;
  opacity: 0.55;
}
.acc-area:hover {
  background: color-mix(in srgb, var(--acc-color, var(--accent)) 8%, var(--bg, #0d1117));
}
.acc-area:hover .acc-area-rail,
.acc-area.on .acc-area-rail {
  opacity: 1;
}
.acc-area.on {
  background: color-mix(in srgb, var(--acc-color, var(--accent)) 14%, var(--bg, #0d1117));
  border-color: color-mix(in srgb, var(--acc-color, var(--accent)) 40%, var(--line));
}
.acc-area-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  padding: 2px 0;
}
.acc-area-name {
  font: 650 0.84rem/1.3 system-ui;
  color: var(--ink, #e6edf3);
}
.acc-area-meta {
  font: 500 0.7rem/1.35 system-ui;
  color: var(--faint, #8b949e);
}
.acc-area-go {
  color: var(--faint, #8b949e);
  font-size: 0.85rem;
  padding-right: 4px;
  opacity: 0.7;
}
.acc-area.on .acc-area-go,
.acc-area:hover .acc-area-go {
  color: var(--acc-color, var(--accent, #58a6ff));
  opacity: 1;
}
.acc-empty {
  margin: 8px 0 0;
  font-size: 0.78rem;
  color: var(--faint);
  padding-left: 10px;
}

/* Stair as connected sequence */
.acc-stair {
  list-style: none;
  margin: 8px 0 0;
  padding: 0 0 0 2px;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-left: 2px solid color-mix(in srgb, var(--accent, #58a6ff) 30%, var(--line));
}
.acc-stair-step {
  display: grid;
  grid-template-columns: 1.6rem 1fr auto;
  gap: 8px;
  align-items: center;
  padding: 9px 10px 9px 12px;
  border: 1px solid var(--line, #30363d);
  border-left: none;
  font-size: 0.8rem;
  color: var(--muted, #c9d1d9);
  background: var(--bg, #0d1117);
  position: relative;
}
.acc-stair-step + .acc-stair-step {
  border-top: none;
}
.acc-stair-step.is-first {
  border-radius: 0 10px 0 0;
}
.acc-stair-step.is-last {
  border-radius: 0 0 10px 0;
}
.acc-stair-step.is-done {
  border-color: color-mix(in srgb, #3fb950 40%, var(--line));
  color: var(--ink, #e6edf3);
  background: color-mix(in srgb, #3fb950 8%, var(--bg, #0d1117));
}
.acc-stair-n {
  font-weight: 750;
  color: var(--accent, #58a6ff);
  font-variant-numeric: tabular-nums;
}
.acc-stair-count {
  font-size: 0.68rem;
  color: var(--faint, #8b949e);
  font-variant-numeric: tabular-nums;
}
.acc-detail-idle {
  margin: 0;
  font-size: 0.8rem;
  color: var(--faint, #8b949e);
  line-height: 1.5;
  padding: 4px 2px 2px;
}
.acc-detail-card {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, var(--accent, #58a6ff) 28%, var(--line));
  background: color-mix(in srgb, var(--accent, #58a6ff) 6%, var(--bg, #0d1117));
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--muted, #c9d1d9);
}
.acc-detail-card strong {
  display: block;
  color: var(--ink, #e6edf3);
  margin-bottom: 4px;
  font-size: 0.95rem;
}
.acc-detail-rungs {
  display: block;
  font: 650 0.72rem/1.2 ui-monospace, Menlo, monospace;
  color: var(--accent, #58a6ff);
  margin-bottom: 6px;
}
.acc-detail-note {
  margin: 6px 0 0;
  font-size: 0.74rem;
  color: var(--faint, #8b949e);
}
.acc-clear {
  margin-top: 10px;
}

/* legacy chip classes kept as aliases for any residual markup */
.acc-chip-row {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.acc-chip {
  /* map old chips to area-ish if any remain */
  appearance: none;
  cursor: pointer;
  text-align: left;
  border: 1px solid var(--line, #30363d);
  border-radius: 0;
  background: var(--bg, #0d1117);
  color: var(--ink, #e6edf3);
  padding: 10px 12px;
  font: inherit;
  width: 100%;
}
.acc-chip.on {
  border-color: color-mix(in srgb, var(--acc-color, var(--accent)) 45%, var(--line));
  background: color-mix(in srgb, var(--acc-color, var(--accent)) 12%, transparent);
}
.acc-chip-name {
  display: block;
  font: 650 0.84rem/1.25 system-ui;
}
.acc-chip-meta {
  display: block;
  margin-top: 2px;
  font: 500 0.7rem/1.2 system-ui;
  color: var(--faint, #8b949e);
}
.acc-tier-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}
.acc-tier-pill {
  font: 700 0.6rem/1 system-ui;
  padding: 6px 8px;
  border: 1px solid var(--line, #30363d);
  color: var(--muted, #c9d1d9);
}
.learn-filter-empty {
  margin: 0 0 10px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px dashed var(--line, #30363d);
  font-size: 0.78rem;
  color: var(--faint, #8b949e);
}
.skill-ladder-total {
  margin: 0 0 8px;
  font-size: 0.72rem;
}
.skill-rung-empty {
  margin: 0;
  padding: 6px 4px;
  font-size: 0.72rem;
}

/* Stair-step skill ladder · stacked linked folds */
.skill-ladder {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-left: 2px solid color-mix(in srgb, var(--accent, #58a6ff) 28%, var(--line));
  padding-left: 0;
  margin-left: 2px;
}

.skill-rung-fold,
.skill-subject-fold {
  border: 1px solid var(--line, #30363d);
  border-left: none;
  border-radius: 0;
  background: var(--bg-card, var(--bg-elev, transparent));
  overflow: hidden;
  color: var(--ink, #e6edf3);
  margin: 0;
}

.skill-rung-fold + .skill-rung-fold {
  border-top: none;
}

.skill-rung-fold:first-child {
  border-radius: 0 12px 0 0;
}

.skill-rung-fold:last-child {
  border-radius: 0 0 12px 0;
}

.skill-subject-fold {
  border-style: solid;
  margin: 0 0 0 8px;
  border-left: 2px solid color-mix(in srgb, var(--accent) 22%, var(--line));
  background: color-mix(in srgb, var(--bg, #0d1117) 40%, var(--bg-elev, #161b22));
  border-radius: 0 8px 8px 0;
}

.skill-subject-fold + .skill-subject-fold {
  margin-top: 4px;
}

html[data-theme="light"] .skill-subject-fold {
  background: color-mix(in srgb, var(--bg, #f6f5f2) 55%, var(--bg-elev, #fff));
}

.skill-rung-summary,
.skill-subject-summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 6px 10px;
  align-items: center;
  padding: 10px 12px;
  font-size: 0.82rem;
  user-select: none;
  color: var(--ink, #e6edf3);
}

.skill-rung-summary::-webkit-details-marker,
.skill-subject-summary::-webkit-details-marker {
  display: none;
}

.skill-rung-summary::before,
.skill-subject-summary::before {
  content: "▸";
  color: var(--faint, #8b949e);
  font-size: 0.7rem;
  grid-row: 1 / span 2;
}

.skill-rung-fold[open] > .skill-rung-summary::before,
.skill-subject-fold[open] > .skill-subject-summary::before {
  content: "▾";
}

.skill-rung-badge {
  font-weight: 750;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  padding: 2px 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent, #58a6ff) 18%, transparent);
  color: var(--accent, #58a6ff);
  white-space: nowrap;
}

.skill-rung-title {
  font-weight: 650;
  grid-column: 2;
  color: var(--ink, #e6edf3);
}

.skill-rung-meta {
  color: var(--faint, #8b949e);
  font-size: 0.72rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.skill-rung-bar {
  grid-column: 2 / -1;
  height: 3px;
  border-radius: 2px;
  background: var(--line, #30363d);
  overflow: hidden;
}

.skill-rung-bar > i {
  display: block;
  height: 100%;
  background: var(--accent, #58a6ff);
  border-radius: 2px;
}

.skill-rung-blurb {
  margin: 0;
  padding: 0 12px 8px;
  font-size: 0.72rem;
  color: var(--faint, #8b949e);
  line-height: 1.35;
}

.skill-rung-subjects {
  padding: 0 8px 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.skill-subject-name {
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--ink, #e6edf3);
}

.skill-subject-count {
  color: var(--faint, #8b949e);
  font-size: 0.7rem;
  font-variant-numeric: tabular-nums;
}

.skill-subject-fold .learn-skill-grid,
.skill-subject-fold .skill-card-grid {
  padding: 0 8px 10px;
}

.learn-skill-grid {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 4px;
}

.learn-skill {
  appearance: none;
  text-align: left;
  border: 1px solid var(--line-soft, #30363d);
  border-left: 3px solid color-mix(in srgb, var(--accent, #58a6ff) 35%, var(--line));
  background: var(--bg, #0d1117);
  color: var(--ink, #e6edf3);
  border-radius: 0 10px 10px 0;
  padding: 11px 12px 11px 12px;
  cursor: pointer;
  display: grid;
  gap: 3px;
  font: inherit;
  width: 100%;
  transition: background 0.12s, border-color 0.12s;
}

.learn-skill + .learn-skill {
  margin-top: -1px;
}

html[data-theme="light"] .learn-skill {
  background: var(--bg-card, #fafaf8);
}

.learn-skill:hover:not(:disabled) {
  border-color: var(--accent, #58a6ff);
}

.learn-skill.is-active {
  border-color: var(--accent, #58a6ff);
  background: color-mix(in srgb, var(--accent, #58a6ff) 12%, var(--bg-elev, #161b22));
}

.learn-skill.is-done .ls-name::after {
  content: "";
}

.learn-skill.is-locked,
.learn-skill:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.ls-name {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--ink, #e6edf3);
}

.ls-meta,
.ls-prereq {
  font-size: 0.72rem;
  color: var(--faint, #8b949e);
}

.ls-badge {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--green, #3fb950);
}

.ls-badge.is-lock {
  color: var(--warn, #d29922);
}

.learn-desc {
  font-size: 0.88rem;
  line-height: 1.45;
  color: var(--muted, #c9d1d9);
}

.learn-evidence {
  margin: 0 0 14px;
  padding-left: 1.1rem;
  font-size: 0.8rem;
  color: var(--faint, #8b949e);
}

.learn-prompt-box {
  border-radius: 12px;
  border: 1px dashed color-mix(in srgb, var(--accent, #58a6ff) 40%, var(--line));
  padding: 18px 16px;
  margin-bottom: 12px;
  text-align: center;
  background: color-mix(in srgb, var(--accent, #58a6ff) 8%, var(--bg-elev, #161b22));
  color: var(--ink, #e6edf3);
}

html[data-theme="light"] .learn-prompt-box {
  background: color-mix(in srgb, var(--accent, #ea580c) 8%, #ffffff);
}

.learn-prompt-label {
  display: block;
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint, #8b949e);
  margin-bottom: 6px;
}

.learn-prompt {
  font-size: 1.75rem;
  font-weight: 750;
  letter-spacing: 0.04em;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--ink, #e6edf3);
}

.learn-input-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 10px;
}

.learn-input {
  flex: 1 1 160px;
  min-width: 140px;
  font: inherit;
  font-size: 1rem;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--bg-elev, var(--bg, #0d1117));
  color: var(--ink, #e6edf3);
}

.learn-layout-label {
  font-size: 0.75rem;
  color: var(--faint);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.learn-layout-label select {
  font: inherit;
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--bg-elev, var(--bg));
  color: var(--ink, inherit);
}

.learn-feedback {
  min-height: 1.4em;
  font-weight: 650;
  font-size: 0.9rem;
  margin-bottom: 8px;
  color: var(--ink, #e6edf3);
}

.learn-feedback.is-ok {
  color: var(--green, #3fb950);
}

.learn-feedback.is-bad {
  color: var(--danger, #f85149);
}

.learn-metrics {
  margin-bottom: 12px;
}
.learn-metric-area {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--line, #30363d);
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg, #0d1117);
}
.learn-metric {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 12px;
  border-right: 1px solid var(--line, #30363d);
  border-bottom: 1px solid var(--line, #30363d);
  min-width: 0;
}
.learn-metric:nth-child(2n) {
  border-right: none;
}
.learn-metric--wide {
  grid-column: 1 / -1;
  border-right: none;
  border-bottom: none;
}
.lm-k {
  font: 700 0.6rem/1.2 system-ui;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--faint, #8b949e);
}
.lm-v {
  font: 650 0.92rem/1.25 ui-monospace, Menlo, monospace;
  color: var(--ink, #e6edf3);
}

/* Local identity · less chip-like */
.learn-local-id {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  align-items: flex-end;
  margin: 0 0 12px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--line, #30363d);
  background: color-mix(in srgb, var(--bg-elev, #161b22) 80%, transparent);
}
.learn-id-chip {
  font-size: 0.72rem;
  padding: 6px 0 0;
  color: var(--faint, #8b949e);
  border: none;
  background: none;
}

.learn-session {
  font-size: 0.8rem;
  color: var(--faint);
}

/* Empty / loading state inside skills pane */
.learn-skills:empty::before {
  content: "Loading skills…";
  display: block;
  padding: 16px;
  color: var(--faint, #8b949e);
  font-size: 0.85rem;
}