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.icon{border-radius:12px;width:46px;height:46px}}.study-actions{flex-wrap:wrap;align-items:center;gap:6px;margin-top:10px;display:flex}.study-actions .chip.imp-important.on{background:var(--high);border-color:var(--high)}.study-actions .chip.imp-less.on{background:var(--muted);border-color:var(--muted)}.note-editor{flex-basis:100%;gap:6px;display:grid}.note-view{background:var(--must-bg);white-space:pre-wrap;border-radius:8px;flex-basis:100%;padding:8px 10px;font-size:.92rem}.lesson-tools{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);margin-top:24px;padding:14px}.notebook-btn{border:1px solid var(--border);color:var(--text);white-space:nowrap;border-radius:8px;align-items:center;gap:6px;padding:5px 10px;font-size:.9rem;display:inline-flex}.notebook-btn:hover,.notebook-btn.active{border-color:var(--accent);color:var(--accent)}@media (max-width:1100px){.notebook-btn{margin-left:auto}.theme-btn{margin-left:0}}@media (max-width:480px){.notebook-btn span{display:none}}.nb-stats{grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin:14px 0;display:grid}.nb-stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;font:inherit;color:var(--text);text-align:left;flex-direction:column;align-items:flex-start;gap:2px;padding:10px 14px;display:flex}.nb-stat b{font-size:1.5rem}.nb-stat span{color:var(--muted);font-size:.88rem}.nb-stat.on{border-color:var(--accent);background:var(--accent-soft)}.nb-h{margin:0 0 6px;font-size:1.15rem}.nb-list{margin:8px 0 12px;padding:0;list-style:none}.nb-list li{border-bottom:1px solid var(--border);flex-wrap:wrap;align-items:center;gap:10px;padding:8px 2px;display:flex}.nb-list li.checked .nb-title{color:var(--muted);text-decoration:line-through}.nb-list input[type=checkbox]{flex:none;width:18px;height:18px}.nb-title{flex:240px;min-width:0}.nb-add{gap:8px;margin:10px 0;display:flex}.nb-add input,.nb-add textarea{flex:1;min-width:0;font-family:inherit}.nb-notes{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:10px;display:grid}.nb-note{background:var(--must-bg);border:1px solid var(--border);border-radius:12px;padding:12px}.nb-note p{white-space:pre-wrap;margin:6px 0}.nb-empty{padding:8px 0}.nb-reset{margin-top:18px}.link-btn{color:var(--accent);cursor:pointer;font:inherit;background:0 0;border:0;padding:2px 4px;font-size:.88rem}.q-short{background:var(--accent-soft);border-radius:8px;margin:8px 0 6px;padding:8px 12px}.q-points{margin:4px 0 8px;padding-left:1.3em}.q-points li{margin:4px 0}.badge.ease-Easy{background:var(--low-soft);color:var(--low)}.badge.ease-Medium{background:var(--medium-soft);color:var(--medium)}.badge.ease-Hard{background:var(--high-soft);color:var(--high)}.qi-course{margin:6px 0 16px}.qi-course h3{flex-wrap:wrap;align-items:center;gap:8px;margin:10px 0 6px;font-size:1.02rem;display:flex}.qi-list{margin:0;padding:0;list-style:none}.qi-list li{border-bottom:1px solid var(--border);flex-wrap:wrap;align-items:baseline;gap:8px;padding:6px 2px;display:flex}.qi-list .qi-q{flex:320px;min-width:0}.qi-legend{flex-wrap:wrap;align-items:center;gap:8px;margin:8px 0 14px;display:flex}.qi-list .qi-q,.q-text,.qi-course h3 a{overflow-wrap:anywhere;word-break:break-word}.qi-list li>.badge{flex:none}.ad-box{text-align:center;min-height:100px;margin:18px 0}.ad-label{letter-spacing:.04em;text-transform:uppercase;color:var(--muted);margin-bottom:4px;font-size:.72rem;display:block}.policy{max-width:820px;padding:8px 0 24px}.policy h2{margin-top:1.4em;font-size:1.25rem}.policy li{margin:.3em 0}