/* Interactive Russian learning lab: progress is data-driven from assets/russian-learning-items.json. */
#learning-lab{scroll-margin-top:12px}
#learning-lab .lab-hero{background:linear-gradient(135deg,#fff7e8,#f2fff6);border:1px solid var(--line);border-radius:22px;padding:22px;margin:16px 0}
.lab-controls{display:grid;grid-template-columns:1fr;gap:12px;margin:16px 0}.lab-controls input,.lab-controls select,.lab-controls textarea{width:100%;border:1px solid var(--line);border-radius:12px;padding:11px 12px;background:#fff;color:var(--ink);font:inherit}.lab-control-row{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.lab-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.lab-tab,.status-btn,.lab-action{border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 12px;font:inherit;cursor:pointer}.lab-tab.active{background:#171717;color:#fff;border-color:#171717}.lab-action{background:#f8f4ec}.lab-progress-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:10px;margin:14px 0}.progress-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:12px}.progress-card strong{display:block}.bar{height:9px;background:#eee4d7;border-radius:999px;overflow:hidden;margin-top:8px}.bar>span{display:block;height:100%;background:linear-gradient(90deg,#b86b24,#2e8a4e);width:0}.learning-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:14px}.learning-card{border:1px solid var(--line);background:#fff;border-radius:18px;padding:16px;display:flex;flex-direction:column;gap:10px}.learning-card.known{box-shadow:inset 0 0 0 2px rgba(31,107,58,.25)}.learning-card.learning{box-shadow:inset 0 0 0 2px rgba(215,149,0,.28)}.ru-line{font-size:24px;font-weight:800;letter-spacing:-.01em}.tr-line{color:#77522c;font-size:14px}.en-line{font-size:16px}.item-meta{display:flex;flex-wrap:wrap;gap:6px}.mini-chip{display:inline-flex;align-items:center;border-radius:999px;padding:3px 8px;font-size:12px;border:1px solid rgba(0,0,0,.08);background:#f6f2eb}.source-chip{background:#eef4ff}.note-list{display:grid;gap:6px}.color-note{display:block;border-radius:12px;padding:8px 10px;font-size:14px}.note-grammar,.note-case{background:#eef4ff;border-left:4px solid #3568d4}.note-pronunciation{background:#f1ecff;border-left:4px solid #7353c8}.note-context,.note-style{background:#fff3df;border-left:4px solid #c77a25}.note-warning{background:#fff0f0;border-left:4px solid #8b1e1e}.note-slang{background:#f5e9ff;border-left:4px solid #9b4dcc}.note-politeness{background:#eaf8f0;border-left:4px solid #2e8a4e}.note-aspect{background:#e9fbff;border-left:4px solid #008da8}.note-falsefriend{background:#fff8ca;border-left:4px solid #b79900}.note-vocab,.note-color{background:#f7f7f7;border-left:4px solid #666}.examples{background:#fbfaf7;border:1px dashed #d6cabc;border-radius:12px;padding:9px}.status-row{display:flex;flex-wrap:wrap;gap:7px}.status-btn[data-status="unknown"]{border-color:#c9c9c9}.status-btn[data-status="learning"]{border-color:#d79500}.status-btn[data-status="known"]{border-color:#1f6b3a}.status-btn.active[data-status="unknown"]{background:#eee}.status-btn.active[data-status="learning"]{background:#fff4d7}.status-btn.active[data-status="known"]{background:#effaf3}.confidence{display:flex;gap:4px}.star{border:0;background:transparent;font-size:20px;cursor:pointer;color:#c7b69f}.star.on{color:#c77a25}.lab-empty{padding:18px;border:1px dashed var(--line);border-radius:14px;background:#fff}.lab-note-key{display:flex;flex-wrap:wrap;gap:7px;margin:10px 0}.lab-note-key span{font-size:12px}.import-box{display:none}.import-box.open{display:block}@media(min-width:760px){.lab-controls{grid-template-columns:1.4fr .6fr .6fr}.lab-control-row{grid-column:1/-1}}