/* Learn mode: question-first concept cards, one per screen */

/* toolbar additions */
.learn-stat { font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; color: var(--ink-soft); display: inline-flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.learn-stat strong { color: var(--ink); }

/* chapter nav */
.learn-nav { display: flex; align-items: center; justify-content: space-between; gap: 12px 20px; flex-wrap: wrap; margin: 0 0 24px; padding: 12px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.learn-dots { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.learn-dot { width: 26px; height: 26px; border: 1px solid var(--line); background: var(--bg-card); font-family: var(--mono); font-size: 11px; color: var(--ink-mute); cursor: pointer; padding: 0; }
.learn-dot.done { background: var(--correct-soft); border-color: var(--correct); color: var(--correct); }
.learn-dot.current { border: 2px solid var(--accent); color: var(--ink); font-weight: 700; }
.learn-dot.end { width: auto; padding: 0 8px; }
.learn-nav-right { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.learn-count { font-family: var(--mono); font-size: 11px; color: var(--ink-soft); letter-spacing: 0.06em; }
.learn-view { display: flex; border: 1px solid var(--line); padding: 3px; background: var(--bg-card); }
.learn-view button { font-family: var(--mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 600; padding: 5px 10px; border: none; background: transparent; color: var(--ink-mute); cursor: pointer; }
.learn-view button.active { background: var(--ink); color: var(--bg); }

/* step view: one card (or panel) at a time */
.learn-steps .learn-card:not(.current) { display: none; }
.learn-steps .mini-quiz { display: none; }
.learn-steps.at-end .mini-quiz { display: block; }
.learn-steps.at-break .learn-card { display: none; }
.learn-panel { display: none; }
.learn-steps.at-break .learn-break, .learn-steps.at-end .learn-finish { display: block; }

/* card */
.learn-card { position: relative; }
.learn-eyebrow { font-family: var(--mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.14em; color: var(--ink-mute); margin-bottom: 10px; display: flex; justify-content: space-between; gap: 8px; }
.learn-eyebrow .done-mark { color: var(--correct); font-weight: 700; }
.learn-relearn { font-family: var(--mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.1em; }
.learn-panel .learn-relearn-note { margin: 14px 0 0; font-size: 13px; color: var(--ink-mute); }
.learn-card .question-text { margin-bottom: 20px; }
.learn-card.locked .learn-body { display: none; }

.learn-hook { background: var(--accent-soft); border-left: 3px solid var(--accent); padding: 18px 20px; margin-bottom: 24px; }
.learn-hook-tag, .learn-box-tag { font-family: var(--mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.14em; font-weight: 700; color: var(--accent); margin-bottom: 10px; }
.learn-hook-q { font-family: var(--serif); font-size: clamp(16px, 3.4vw, 19px); line-height: 1.4; margin-bottom: 14px; }
.learn-hook .options { display: flex; flex-direction: column; gap: 8px; }
.learn-hook-why { margin-top: 14px; font-size: 14.5px; line-height: 1.55; }
.learn-hook-why .verdict { font-weight: 700; }
.learn-hook-why.correct .verdict { color: var(--correct); }
.learn-hook-why.wrong .verdict { color: var(--wrong); }
.learn-hook-skip { margin-top: 12px; font-size: 13px; }
.learn-card:not(.locked) .learn-hook-skip { display: none; }

.learn-body > * + * { margin-top: 20px; }
.learn-body .feedback { margin-top: 0; }
.learn-key { font-family: var(--serif); font-size: clamp(17px, 3.6vw, 20px); line-height: 1.4; padding: 14px 0 14px 16px; border-left: 3px solid var(--ink); }
.learn-key .learn-box-tag { color: var(--ink); font-family: var(--mono); }
.learn-scenario { background: var(--bg); border: 1px dashed var(--line); padding: 16px 18px; font-size: 14.5px; line-height: 1.6; color: var(--ink-soft); }
.learn-scenario .learn-box-tag { color: var(--ink); }

.learn-tech { border: 1px solid var(--line); }
.learn-tech > summary { cursor: pointer; list-style: none; padding: 12px 16px; font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.12em; font-weight: 600; color: var(--ink-soft); display: flex; justify-content: space-between; }
.learn-tech > summary::-webkit-details-marker { display: none; }
.learn-tech > summary::after { content: '+'; font-size: 14px; }
.learn-tech[open] > summary::after { content: '−'; }
.learn-tech > summary:hover { color: var(--ink); }
.learn-tech .concept-section { padding: 4px 16px 4px; margin-bottom: 8px; }

.learn-foot { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; padding-top: 20px; border-top: 1px solid var(--line); }
.learn-foot .btn { padding: 12px 20px; font-size: 12px; }
.learn-all .learn-foot .learn-prev { display: none; }
.learn-done-toggle { font-size: 13px; color: var(--ink-soft); display: inline-flex; gap: 8px; align-items: center; cursor: pointer; }

/* break / finish panels */
.learn-break, .learn-finish { background: var(--bg-card); border: 1px solid var(--line-strong); padding: clamp(24px, 5vw, 40px); margin-bottom: 24px; }
.learn-panel h2 { font-family: var(--serif); font-size: clamp(22px, 4.4vw, 28px); font-weight: 600; letter-spacing: -0.02em; margin-bottom: 8px; }
.learn-panel p { color: var(--ink-soft); margin-bottom: 16px; }
.learn-panel ul { list-style: none; margin: 0 0 24px; display: flex; flex-direction: column; gap: 10px; }
.learn-panel li { padding-left: 24px; position: relative; line-height: 1.5; }
.learn-panel li::before { content: '✓'; position: absolute; left: 0; color: var(--correct); font-weight: 700; }
.learn-panel-actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.learn-panel-actions .btn { padding: 12px 20px; font-size: 12px; }
.learn-rest-note { margin-top: 14px; font-size: 13.5px; color: var(--correct); }

/* toys */
.learn-toy { border: 1px solid var(--ink); padding: 18px 20px; background: var(--bg-card); }
.learn-toy .learn-box-tag { color: var(--ink); }
.toy-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }
.toy-row label { font-family: var(--mono); font-size: 12px; color: var(--ink-soft); }
.toy-row input[type="range"] { flex: 1; min-width: 140px; accent-color: var(--accent); }
.toy-input { flex: 1; min-width: 0; width: 100%; font: inherit; font-size: 15px; padding: 10px 12px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); }
.toy-input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.toy-chip-btn { font-family: var(--mono); font-size: 11px; padding: 5px 9px; border: 1px solid var(--line); background: var(--bg); cursor: pointer; color: var(--ink); }
.toy-chip-btn:hover, .toy-chip-btn.active { border-color: var(--ink); }
.toy-chip-btn.active { background: var(--ink); color: var(--bg); }
.toy-tokens { display: flex; flex-wrap: wrap; gap: 3px; margin: 6px 0 10px; min-height: 30px; }
.toy-token { font-family: var(--mono); font-size: 14px; padding: 3px 6px; border-radius: 2px; white-space: pre; color: var(--ink); }
.toy-token:nth-child(5n+1) { background: #f7e0d3; }
.toy-token:nth-child(5n+2) { background: #dcebe3; }
.toy-token:nth-child(5n+3) { background: #e3e0f2; }
.toy-token:nth-child(5n+4) { background: #f3ecd0; }
.toy-token:nth-child(5n+5) { background: #d7e7f1; }
.toy-note { font-size: 13.5px; color: var(--ink-soft); line-height: 1.55; }
.toy-note strong { color: var(--ink); }
.toy-prompt { font-family: var(--serif); font-size: 17px; margin-bottom: 12px; }
.toy-bars { display: flex; flex-direction: column; gap: 5px; margin-bottom: 12px; }
.toy-bar { display: grid; grid-template-columns: 90px 1fr 46px; gap: 10px; align-items: center; font-size: 13.5px; }
.toy-bar-track { height: 14px; background: var(--bg); border: 1px solid var(--line); }
.toy-bar-fill { height: 100%; background: var(--accent); transition: width 0.2s; }
.toy-bar.out .toy-bar-fill { background: var(--line); }
.toy-bar.out { color: var(--ink-mute); text-decoration: line-through; }
.toy-bar-pct { font-family: var(--mono); font-size: 11.5px; text-align: right; }
.toy-samples { display: flex; gap: 6px; flex-wrap: wrap; min-height: 28px; }
.toy-sample { font-size: 13.5px; padding: 3px 9px; border: 1px solid var(--line); background: var(--bg); }

@media (max-width: 600px) {
  .learn-nav { flex-direction: column; align-items: flex-start; }
  .learn-foot .btn, .learn-panel-actions .btn { width: 100%; }
  .toy-bar { grid-template-columns: 70px 1fr 40px; }
}