:root{--bg:#0b1020;--side:#0c1323;--surface:#121b2d;--surface2:#172239;--surface3:#1d2b44;--border:#27364f;--text:#f1f4ff;--muted:#98a8c3;--faint:#6f83a3;--mint:#a7efd3;--mint-deep:#2e8065;--purple:#b2a5fc;--blue:#8db5ff;--orange:#f4c78a;--red:#fb9b9e;--shadow:0 18px 55px rgba(0,0,0,.14);--radius:16px}
html.light{--bg:#f2f5fa;--side:#ffffff;--surface:#fff;--surface2:#f4f7fb;--surface3:#e8eef7;--border:#dce4ef;--text:#1a2740;--muted:#5e708c;--faint:#8391a6;--mint:#207e61;--mint-deep:#dcf7ea;--purple:#705ac7;--blue:#376db8;--orange:#a56410;--red:#ad404a;--shadow:0 14px 40px rgba(34,49,90,.06)}
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.app-shell{min-height:100vh;display:flex}.sidebar{width:250px;background:var(--side);border-right:1px solid var(--border);display:flex;flex-direction:column;position:fixed;inset:0 auto 0 0;z-index:20;padding:26px 14px 20px}.brand{text-decoration:none;display:flex;align-items:center;gap:12px;padding:5px 10px 32px}.brand-mark{height:41px;width:41px;background:var(--mint);color:#0b1721;border-radius:13px;display:grid;place-items:center;font-size:29px;line-height:1}.brand-type{display:flex;flex-direction:column;line-height:1.15;letter-spacing:.6px}.brand-type strong{font-size:17px;font-weight:850}.brand-point{color:var(--mint)}.brand-type small{font-size:8px;color:var(--muted);font-weight:800;letter-spacing:1.65px;margin-top:6px}.side-label{color:var(--faint);font-size:10px;font-weight:800;letter-spacing:1.7px;padding:5px 17px 11px}.space-top{margin-top:27px}.nav{display:flex;flex-direction:column;gap:4px}.nav-item{border:1px solid transparent;background:transparent;color:var(--muted);border-radius:10px;display:flex;align-items:center;text-align:left;gap:12px;padding:11px 14px;font-weight:650;width:100%}.nav-item:hover{background:var(--surface2);color:var(--text)}.nav-item.active{background:var(--surface3);border-color:var(--border);color:var(--mint)}.nav-icon{font-size:21px;width:22px;text-align:center;font-weight:400;line-height:1}.side-count{margin-left:auto;font-size:11px;padding:1px 6px;background:var(--surface3);border-radius:7px}.side-bottom{margin-top:auto}.source-card{border:1px solid var(--border);padding:14px 13px;border-radius:12px;background:var(--surface);display:flex;align-items:flex-start;gap:10px}.source-card strong,.source-card small{display:block}.source-card strong{font-size:12px}.source-card small{font-size:11px;line-height:1.45;color:var(--muted);margin-top:2px}.live-dot{height:8px;width:8px;background:var(--mint);border-radius:100%;margin-top:5px;box-shadow:0 0 0 4px rgba(142,226,188,.12)}.mini-note{color:var(--faint);font-size:10px;line-height:1.75;padding:17px 11px 0}
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.filter-panel{padding:18px;margin-bottom:16px}.filter-grid{display:grid;grid-template-columns:minmax(200px,1.9fr) repeat(4,minmax(105px,1fr));gap:11px}.filter-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;margin-top:12px}.filter-control{display:flex;flex-direction:column;gap:6px}.filter-control label{font-size:10px;color:var(--muted);font-weight:750;text-transform:uppercase;letter-spacing:1px}.field{width:100%;border:1px solid var(--border);background:var(--surface2);color:var(--text);border-radius:9px;height:39px;padding:7px 10px;outline:0;font-size:12px;min-width:0}.field:focus{border-color:var(--mint)}.field::placeholder{color:var(--faint)}textarea.field{height:auto;min-height:100px;resize:vertical;padding:12px}.scope-strip{display:flex;flex-wrap:wrap;gap:7px;align-items:center}.pill-toggle{padding:6px 10px;background:var(--surface2);color:var(--muted);border:1px solid var(--border);border-radius:8px;font-size:11px;font-weight:750}.pill-toggle.selected{color:var(--mint);background:var(--surface3);border-color:var(--mint-deep)}.badge{border-radius:6px;font-size:10px;font-weight:800;padding:4px 7px;white-space:nowrap;display:inline-block}.badge.easy{background:rgba(107,227,163,.13);color:var(--mint)}.badge.medium{background:rgba(140,178,255,.14);color:var(--blue)}.badge.hard{background:rgba(244,178,116,.13);color:var(--orange)}.badge.muted{background:var(--surface3);color:var(--muted)}.badge.public{background:rgba(179,155,248,.12);color:var(--purple)}.badge.tma{background:rgba(241,183,121,.12);color:var(--orange)}
.question-list{display:flex;flex-direction:column;gap:12px}.question-card{border:1px solid var(--border);border-radius:14px;background:var(--surface);padding:19px 22px}.question-head{display:flex;gap:9px;align-items:center;flex-wrap:wrap;justify-content:space-between;margin-bottom:13px}.question-tags{display:flex;gap:7px;align-items:center;flex-wrap:wrap}.qid{color:var(--mint);font-size:11px;letter-spacing:.5px;font-weight:850}.meta-line{color:var(--muted);font-size:11px;display:flex;flex-wrap:wrap;gap:7px;align-items:center}.question-text{font-size:14px;line-height:1.8;white-space:pre-wrap;overflow-wrap:anywhere}.question-text p{margin:0 0 5px}.option-list{display:grid;gap:8px;margin-top:14px}.option-row{border:1px solid var(--border);background:var(--surface2);border-radius:9px;padding:9px 12px;display:flex;gap:11px;align-items:start;cursor:pointer;font-size:13px}.option-row:hover{border-color:var(--faint)}.option-row.selected{border-color:var(--mint);background:rgba(100,219,164,.065)}.option-row input{margin-top:4px;accent-color:var(--mint)}.diagram{margin:14px 0 5px;max-width:min(100%,680px);border:1px solid var(--border);border-radius:10px;background:white;padding:8px}.diagram img{display:block;max-width:100%;max-height:460px;object-fit:contain}.question-footer{border-top:1px solid var(--border);margin-top:16px;padding-top:13px;display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}.question-actions{display:flex;align-items:center;gap:6px}.round-action{border:1px solid var(--border);background:var(--surface2);color:var(--muted);border-radius:8px;padding:7px 11px;font-size:11px;font-weight:750}.round-action.on{border-color:var(--mint-deep);color:var(--mint)}.round-action:hover{color:var(--text)}.review-note{font-size:11px;color:var(--orange);margin:10px 0 0}.empty-state{text-align:center;padding:60px 20px;border:1px dashed var(--border);border-radius:14px;color:var(--muted)}.empty-state .big{font-size:35px}.empty-state h3{color:var(--text);font-size:18px;margin:12px 0 5px}.pagination{display:flex;justify-content:center;align-items:center;gap:12px;margin:23px 0}.pager{padding:9px 14px;border:1px solid var(--border);background:var(--surface);border-radius:8px;color:var(--text);font-weight:750}
.chapter-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.chapter-card{border:1px solid var(--border);background:var(--surface);padding:19px;border-radius:13px;text-align:left;color:var(--text);width:100%;transition:transform .15s,border-color .15s}.chapter-card:hover{transform:translateY(-2px);border-color:var(--mint-deep)}.chapter-heading{display:flex;justify-content:space-between;gap:10px;align-items:center}.chapter-number{color:var(--mint);font-size:12px;font-weight:800}.chapter-card h3{margin:13px 0 7px;font-size:14px;font-weight:800;min-height:42px;line-height:1.4}.chapter-card p{color:var(--muted);font-size:11px;margin:0 0 15px}.chapter-progress{display:flex;gap:10px;justify-content:space-between;color:var(--muted);font-size:11px;margin:0 0 8px}.chapter-progress strong{color:var(--text)}.chapter-group{margin-bottom:26px}.section-title{font-size:20px;font-weight:800;margin:18px 0 16px;display:flex;gap:12px;align-items:center}.section-title small{font-size:11px;color:var(--muted);font-weight:650}
.practice-setup{max-width:780px}.setup-row{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin-bottom:20px}.setup-hint{font-size:11px;color:var(--muted);margin:10px 0}.practice-shell{max-width:900px;margin:auto}.practice-top{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:15px}.progress-track{height:7px;background:var(--surface3);border-radius:15px;overflow:hidden;margin-bottom:24px}.progress-track>div{height:100%;background:var(--mint);border-radius:15px;transition:width .25s}.practice-card{padding:27px 32px}.practice-card .question-text{font-size:17px;line-height:1.9}.practice-controls{display:flex;align-items:center;justify-content:space-between;gap:15px;flex-wrap:wrap;margin-top:22px}.grades{display:flex;gap:9px;flex-wrap:wrap}.grade-btn{padding:10px 15px;border-radius:9px;background:var(--surface2);border:1px solid var(--border);color:var(--text);font-size:12px;font-weight:750}.grade-btn.correct:hover,.grade-btn.correct.selected{border-color:var(--mint);color:var(--mint)}.grade-btn.wrong:hover,.grade-btn.wrong.selected{border-color:var(--red);color:var(--red)}.grade-btn.skip:hover,.grade-btn.skip.selected{border-color:var(--orange);color:var(--orange)}.timer{font-variant-numeric:tabular-nums;font-weight:850;font-size:14px;color:var(--mint)}.summary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0}.score-num{font-size:42px;font-weight:850}.summary-good{color:var(--mint)}.summary-bad{color:var(--red)}.summary-neutral{color:var(--orange)}.result-list{display:grid;gap:7px;margin-top:20px}.result-row{padding:10px 13px;background:var(--surface2);border-radius:9px;display:flex;justify-content:space-between;gap:10px;align-items:center;font-size:12px}.result-row .result-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:75%}
.year-chart{display:flex;align-items:flex-end;gap:14px;height:195px;border-bottom:1px solid var(--border);padding:5px 8px 0}.year-col{height:100%;display:flex;align-items:center;flex-direction:column;justify-content:flex-end;flex:1;gap:7px;font-size:11px}.year-col .year-bar{width:min(46px,100%);border-radius:6px 6px 0 0;background:linear-gradient(180deg,var(--mint),var(--mint-deep));min-height:2px}.year-col strong{font-size:11px}.year-col small{color:var(--muted)}.rank-item{display:flex;gap:13px;border-bottom:1px solid var(--border);padding:15px 0;align-items:start}.rank-item:last-child{border:0}.rank-pos{width:30px;height:30px;border-radius:9px;background:var(--surface3);display:grid;place-items:center;color:var(--mint);font-size:11px;font-weight:850;flex-shrink:0}.rank-text{flex:1;min-width:0}.rank-text strong{font-size:12px}.rank-text p{margin:4px 0 0;color:var(--muted);font-size:11px}.rank-count{font-size:14px;font-weight:850}.file-tree{font-size:12px;color:var(--muted);line-height:2.2;background:var(--surface2);padding:17px;border-radius:11px;overflow-x:auto;white-space:pre;font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.library-actions{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}.small-muted{font-size:11px;color:var(--muted)}.footer-note{margin-top:27px;padding-top:19px;border-top:1px solid var(--border);color:var(--faint);font-size:11px}.toast-region{position:fixed;z-index:100;bottom:20px;right:22px;display:grid;gap:8px}.toast{background:var(--surface3);border:1px solid var(--border);color:var(--text);padding:12px 17px;border-radius:11px;box-shadow:var(--shadow);max-width:340px;font-size:12px}.mobile-scrim{display:none}.hide{display:none!important}.kbd{font:11px ui-monospace,monospace;background:var(--surface3);padding:2px 5px;border:1px solid var(--border);border-radius:4px}
@media(max-width:1250px){.topbar{padding:0 27px}main{padding:30px 27px 70px}.filter-grid{grid-template-columns:repeat(3,1fr)}.filter-grid .search-field{grid-column:span 3}.chapter-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:960px){.sidebar{width:235px}.main-wrap{margin-left:235px}.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.two-column{grid-template-columns:1fr}.hero-art{min-width:110px}.atom{font-size:100px}.top-status{display:none}.triple-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:700px){.sidebar{transform:translateX(-100%);transition:transform .2s;width:270px}.sidebar.open{transform:translateX(0)}.mobile-scrim.open{display:block;position:fixed;inset:0;background:#0009;z-index:15}.main-wrap{margin-left:0}.topbar{height:64px;padding:0 15px}.mobile-menu{display:grid}.topbar-left{display:flex;align-items:center;gap:12px}.top-actions{gap:9px}.top-actions .btn{padding:8px;font-size:10px}.eyebrow{font-size:10px}main{padding:24px 15px 64px}.page-title{font-size:28px}.page-heading{align-items:flex-start;flex-direction:column;gap:13px}.hero{padding:25px;min-height:unset}.hero h2{font-size:22px}.hero-art{display:none}.stats-grid{gap:9px}.stat{padding:16px}.stat-number{font-size:26px}.panel{padding:18px}.filter-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.filter-grid .search-field{grid-column:span 2}.chapter-grid{grid-template-columns:1fr}.donut-layout{flex-wrap:wrap}.question-card{padding:15px}.practice-card{padding:18px}.practice-card .question-text{font-size:15px}.setup-row{grid-template-columns:1fr}.summary-grid{gap:7px}.score-num{font-size:29px}.triple-grid{grid-template-columns:1fr}}
@media(max-width:420px){.page-title{font-size:25px}.top-actions .btn span{display:none}.filter-grid{grid-template-columns:1fr}.filter-grid .search-field{grid-column:span 1}.stat-label{font-size:10px}.stat-number{font-size:24px}.bar-row{grid-template-columns:minmax(0,1fr) 1.2fr 27px}}

.chapter-more summary{width:fit-content;cursor:pointer}.chapter-more-close{display:none}.chapter-more[open] .chapter-more-open{display:none}.chapter-more[open] .chapter-more-close{display:inline}

.difficulty-filter{max-width:180px;margin-bottom:18px}.difficulty-ranking .bar-label{white-space:normal;overflow:visible}.coverage-panel{margin-bottom:18px}