:root{--teal-900:#083f3b;--teal-800:#0a4f4a;--teal-700:#0e6e67;--teal-600:#13837b;--teal-500:#1d9d93;--teal-100:#d8ece8;--teal-50:#edf6f4;--cream:#f6f1e4;--cream-deep:#efe7d4;--paper:#fffdf7;--ink:#1d2a28;--ink-soft:#485954;--muted:#6d7b76;--line:#e2dac7;--line-soft:#ece5d5;--amber:#c8892a;--amber-soft:#fdf1d8;--red:#b23b32;--red-soft:#fbeae7;--green:#1f7a4d;--green-soft:#e4f4ea;--shadow-sm:0 1px 2px #172b280f, 0 2px 8px #172b280d;--shadow-md:0 4px 14px #172b2814, 0 1px 3px #172b280f;--radius-sm:10px;--radius:16px;--radius-lg:22px;--safe-top:env(safe-area-inset-top,0px);--safe-bottom:env(safe-area-inset-bottom,0px);--safe-left:env(safe-area-inset-left,0px);--safe-right:env(safe-area-inset-right,0px);--nav-height:60px;--font:"Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;-moz-text-size-adjust:100%;text-size-adjust:100%}body{min-height:100dvh;font-family:var(--font);color:var(--ink);background:var(--cream);background-image:radial-gradient(120% 60% at 50% -10%, #fbf7ec 0%, var(--cream) 55%, var(--cream-deep) 100%);-webkit-font-smoothing:antialiased;overscroll-behavior-y:none;background-attachment:fixed;margin:0;font-size:16px;line-height:1.65}h1,h2,h3,h4{letter-spacing:-.01em;margin:0;font-weight:700;line-height:1.3}p{margin:0}a{color:var(--teal-700);text-underline-offset:3px}button{font-family:inherit;font-size:inherit;color:inherit}input,textarea,select{font-family:inherit;font-size:16px}:focus-visible{outline-offset:2px;border-radius:6px;outline:3px solid #13837b8c}.num{font-variant-numeric:tabular-nums}.muted{color:var(--muted)}.small{font-size:13px}.pad{padding:16px 4px}.skip-link{z-index:100;background:var(--teal-700);color:#fff;border-radius:0 0 12px;padding:10px 16px;position:absolute;top:0;left:-999px}.skip-link:focus{left:0}.boot{text-align:center;color:var(--muted);padding:40px 24px}.app{min-height:100dvh}.shell{flex-direction:column;max-width:100%;min-height:100dvh;display:flex}.app-header{z-index:20;padding:calc(10px + var(--safe-top)) calc(16px + var(--safe-right)) 10px calc(16px + var(--safe-left));-webkit-backdrop-filter:blur(12px);background:linear-gradient(#f6f1e4fa,#f6f1e4e6);border-bottom:1px solid #e2dac7b3;justify-content:space-between;align-items:center;gap:12px;display:flex;position:sticky;top:0}.brand{align-items:center;gap:10px;min-width:0;display:flex}.brand-mark{background:linear-gradient(150deg, var(--teal-600), var(--teal-800));color:#f6f1e4;width:34px;height:34px;box-shadow:var(--shadow-sm);border-radius:11px;flex:none;place-items:center;display:grid}.brand-text{flex-direction:column;min-width:0;line-height:1.25;display:flex}.brand-text strong{letter-spacing:.01em;white-space:nowrap;font-size:15px}.brand-sub{color:var(--muted);white-space:nowrap;font-size:11px}.brand.big .brand-mark{border-radius:13px;width:42px;height:42px}.brand.big strong{font-size:19px}.brand.big .brand-sub{font-size:12px}.header-actions{flex:none;align-items:center;gap:8px;display:flex}.mode-pill{letter-spacing:.02em;white-space:nowrap;border-radius:999px;align-items:center;padding:3px 9px;font-size:11px;font-weight:700;display:inline-flex}.mode-pill.live{background:var(--green-soft);color:var(--green)}.mode-pill.demo{background:var(--amber-soft);color:#8a5a12;border:1px dashed #c8892a80}.sync-btn{border:1px solid var(--line);background:var(--paper);color:var(--ink-soft);cursor:pointer;border-radius:999px;align-items:center;gap:5px;min-height:36px;padding:6px 10px;display:inline-flex}.sync-btn:active{transform:scale(.98)}.sync-btn .sync-text{flex-direction:column;align-items:flex-start;line-height:1.15;display:flex}.sync-btn .sync-label{font-size:11px;font-weight:700}.sync-btn .sync-time{color:var(--muted);font-variant-numeric:tabular-nums;font-size:10px}.sync-btn .sync-time.bad{color:var(--red);font-weight:700}.sync-btn.pulse{animation:.7s ease-out pulse-ring}@keyframes pulse-ring{0%{box-shadow:0 0 #13837b59}to{box-shadow:0 0 0 12px #13837b00}}.banner-host{top:calc(55px + var(--safe-top));z-index:18;flex-direction:column;gap:1px;display:flex;position:sticky}.demo-banner,.offline-banner{padding:8px calc(16px + var(--safe-right)) 8px calc(16px + var(--safe-left));align-items:flex-start;gap:8px;margin:0;font-size:12.5px;line-height:1.5;display:flex}.demo-banner{background:linear-gradient(90deg, var(--amber-soft), #fdf6e6);color:#7a4f10;border-bottom:1px solid #c8892a40}.demo-banner strong{background:#c8892a29;border-radius:4px;flex:none;padding:0 6px}.offline-banner{background:var(--red-soft);color:#7d2820;border-bottom:1px solid #b23b3240;flex-wrap:wrap;align-items:center}.offline-banner svg{flex:none}.offline-text{flex-direction:column;flex:200px;gap:1px;min-width:0;display:flex}.offline-text strong{font-size:12px}.app-main{width:100%;max-width:720px;padding:16px calc(16px + var(--safe-right)) calc(var(--nav-height) + var(--safe-bottom) + 28px) calc(16px + var(--safe-left));flex:auto;min-width:0;margin:0 auto}.screen{flex-direction:column;gap:16px;animation:.22s ease-out rise;display:flex}@keyframes rise{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}@media (prefers-reduced-motion:reduce){.screen{animation:none}*{scroll-behavior:auto!important}}.screen-head{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.title-block h1{letter-spacing:-.02em;font-size:25px}.title-block .sub{color:var(--muted);margin-top:4px;font-size:13.5px;line-height:1.5}.screen-body{flex-direction:column;gap:14px;display:flex}.card{background:var(--paper);border:1px solid var(--line-soft);border-radius:var(--radius);box-shadow:var(--shadow-sm);flex-direction:column;gap:10px;min-width:0;padding:16px;display:flex}.card h2{font-size:17px}.card-sub{color:var(--muted);font-size:13px;line-height:1.5}.card-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;display:flex}.accent-card{background:linear-gradient(160deg, #fff, var(--teal-50));box-shadow:var(--shadow-md);border-color:#13837b59}.warn-card{background:linear-gradient(160deg,#fffdf7,#fdf7e8);border-color:#c8892a66}.subtle{box-shadow:none;background:0 0;border-style:dashed}.card .meta{color:var(--muted);font-size:12px}.empty-card{text-align:center;align-items:center;padding:28px 18px}.btn{border:1px solid var(--line);background:var(--paper);min-height:44px;color:var(--ink);cursor:pointer;-webkit-tap-highlight-color:transparent;touch-action:manipulation;border-radius:12px;justify-content:center;align-items:center;gap:6px;padding:10px 18px;font-size:15px;font-weight:600;transition:transform .12s,background .15s,box-shadow .15s;display:inline-flex}.btn:active:not(:disabled){transform:translateY(1px)scale(.995)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.primary{background:linear-gradient(150deg, var(--teal-600), var(--teal-800));border-color:var(--teal-800);color:#fdfbf3;box-shadow:0 4px 12px #0a4f4a3d}.btn.primary:active:not(:disabled){box-shadow:0 2px 6px #0a4f4a4d}.btn.ghost{color:var(--teal-700);background:0 0;border-color:#0000;padding-inline:10px}.btn.ghost:hover{background:var(--teal-50)}.btn.danger{background:var(--red);border-color:var(--red);color:#fff}.btn.wide{width:100%}.btn.small{border-radius:10px;min-height:36px;padding:6px 12px;font-size:13.5px}.btn.tiny{border-radius:8px;min-height:30px;padding:4px 10px;font-size:12px}.actions-row{flex-wrap:wrap;align-items:center;gap:10px;margin-top:4px;display:flex}.actions-row>.btn{flex:0 auto}.sticky-actions{margin-top:6px}.pill{background:var(--teal-50);color:var(--teal-700);white-space:nowrap;border:1px solid #13837b38;border-radius:999px;align-items:center;padding:2px 9px;font-size:11.5px;font-weight:700;display:inline-flex}.pill.tight{padding:1px 7px;font-size:11px}.pill.tiny{padding:1px 7px;font-size:10.5px;font-weight:600}.pill.accent{background:linear-gradient(140deg, var(--teal-600), var(--teal-700));color:#fdfbf3;border-color:#0000}.pill.ok{background:var(--green-soft);color:var(--green);border-color:#1f7a4d3d}.pill.warn{background:var(--amber-soft);color:#8a5a12;border-color:#c8892a52}.inline-alert,.inline-notice{border-radius:var(--radius-sm);align-items:flex-start;gap:8px;margin:0;padding:10px 12px;font-size:13.5px;line-height:1.55;display:flex}.inline-alert{background:var(--red-soft);color:#7d2820;border:1px solid #b23b3238}.inline-alert svg{flex:none;margin-top:1px}.inline-notice{background:var(--teal-50);color:var(--teal-800);border:1px solid #13837b33}.inline-notice.warn{background:var(--amber-soft);color:#7a4f10;border-color:#c8892a4d}.inline-confirm{border-radius:var(--radius-sm);background:var(--amber-soft);border:1px solid #c8892a4d;flex-direction:column;gap:8px;margin-top:8px;padding:12px;font-size:13.5px;display:flex}.item-list,.slot-list,.topic-list,.point-list,.record-list,.summary-list{flex-direction:column;gap:8px;margin:0;padding:0;list-style:none;display:flex}.item-list li,.summary-list li{border-radius:var(--radius-sm);border:1px solid var(--line-soft);background:#f6f1e48c;align-items:center;gap:10px;padding:9px 11px;display:flex}.item-list li.done{opacity:.72}.item-list.compact li{padding:7px 10px}.list-main{flex-direction:column;flex:auto;gap:1px;min-width:0;display:flex}.list-title{font-size:14px;font-weight:600;line-height:1.4}.list-sub{color:var(--muted);font-size:12px;line-height:1.4}.item-list li>.list-title{flex:auto;min-width:0}.slot-list li{border-radius:var(--radius-sm);border:1px solid var(--line-soft);background:#f6f1e480;justify-content:space-between;align-items:center;gap:10px;padding:9px 12px;display:flex}.slot-list li.done{background:var(--green-soft);border-color:#1f7a4d2e}.slot-time{color:var(--teal-800);font-weight:700}.slot-state{color:var(--muted);font-size:12.5px}.slot-list li.done .slot-state{color:var(--green);font-weight:600}.stat-row{grid-template-columns:repeat(3,1fr);gap:10px;display:grid}.stat{border-radius:var(--radius);background:var(--paper);border:1px solid var(--line-soft);box-shadow:var(--shadow-sm);flex-direction:column;gap:2px;min-width:0;padding:12px;display:flex}.stat-value{color:var(--teal-800);letter-spacing:-.02em;font-size:22px;font-weight:700;line-height:1.15}.stat-label{color:var(--muted);white-space:nowrap;text-overflow:ellipsis;font-size:11.5px;overflow:hidden}.progress-track{background:var(--cream-deep);border-radius:999px;height:7px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--teal-500), var(--teal-700));border-radius:999px;height:100%;transition:width .4s;display:block}.progress-steps{flex:auto;justify-content:center;align-items:center;gap:5px;min-width:0;display:flex}.progress-steps span{background:var(--cream-deep);border:1px solid #0000;border-radius:999px;flex:1 1 0;max-width:46px;height:5px}.progress-steps span.done{background:var(--teal-500)}.progress-steps span.current{background:var(--teal-700);box-shadow:0 0 0 2px #13837b33}.progress-steps span.excluded{background:repeating-linear-gradient(90deg, var(--cream-deep) 0 4px, transparent 4px 7px)}.segmented{border:1px solid var(--line-soft);background:#e2dac780;border-radius:999px;gap:4px;padding:4px;display:flex}.segmented.wrap{border-radius:var(--radius);flex-wrap:wrap}.seg{min-height:34px;color:var(--ink-soft);cursor:pointer;white-space:nowrap;background:0 0;border:none;border-radius:999px;flex:auto;padding:5px 12px;font-size:13px;font-weight:600}.segmented.wrap .seg{border-radius:9px;flex:0 auto}.seg.active{background:var(--paper);color:var(--teal-800);box-shadow:var(--shadow-sm)}.topic-list li,.point-list li{list-style:none}.topic-button,.point-button,.map-card{text-align:left;border-radius:var(--radius);border:1px solid var(--line-soft);background:var(--paper);width:100%;box-shadow:var(--shadow-sm);cursor:pointer;-webkit-tap-highlight-color:transparent;flex-direction:column;gap:7px;padding:14px;display:flex}.topic-button:active,.point-button:active,.map-card:active{background:#fffefa;transform:scale(.995)}.topic-head,.point-head,.map-card-head{justify-content:space-between;align-items:flex-start;gap:10px;display:flex}.topic-title,.point-title,.map-title{min-width:0;font-size:15px;font-weight:700;line-height:1.4}.topic-meta,.point-meta,.map-card-meta{color:var(--muted);flex-wrap:wrap;gap:4px 12px;font-size:12px;display:flex}.topic-meta .due,.map-card-meta .due,.point-meta .fog{color:var(--amber);font-weight:600}.point-meta .edge{color:var(--teal-600);font-weight:600}.point-summary{color:var(--ink-soft);font-size:13px;line-height:1.5}.map-card{position:relative}.map-card-foot{color:var(--muted);justify-content:space-between;align-items:center;display:flex}.topic-cards{flex-direction:column;gap:10px;display:flex}.panel{border-radius:var(--radius);background:var(--paper);border:1px solid var(--line-soft);box-shadow:var(--shadow-sm);flex-direction:column;gap:10px;padding:16px;display:flex}.panel h2{font-size:17px}.panel h3{color:var(--ink-soft);margin-top:6px;font-size:14px}.back-btn{align-self:flex-start;margin-left:-10px}.detail-panel{border-color:#13837b4d}.point-detail-summary{font-size:14px}.record-list{gap:6px}.record-item{border-radius:var(--radius-sm);border:1px solid var(--line-soft);border-left:3px solid var(--line);background:#f6f1e480;flex-direction:column;gap:4px;padding:10px 12px;display:flex}.record-item.ok{border-left-color:var(--green)}.record-item.bad{border-left-color:var(--amber)}.record-item.voided{opacity:.66}.record-head{color:var(--muted);flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;display:flex}.record-form{color:var(--ink-soft);font-weight:700}.record-time{margin-right:auto}.record-feedback{color:var(--ink-soft);font-size:13px;line-height:1.5}.field{flex-direction:column;gap:6px;display:flex}.field-label{color:var(--ink-soft);font-size:13px;font-weight:700}.field-hint{color:var(--muted);font-size:12px;line-height:1.5}.input,.textarea{border:1px solid var(--line);background:var(--paper);width:100%;min-height:46px;color:var(--ink);border-radius:12px;padding:11px 13px;transition:border-color .15s,box-shadow .15s}.input:focus,.textarea:focus{border-color:var(--teal-600);outline:none;box-shadow:0 0 0 3px #13837b29}.input:disabled,.textarea:disabled{color:var(--muted);background:#f4f0e6}.textarea{resize:vertical;min-height:112px;line-height:1.6}.code-input{letter-spacing:.08em;font-family:ui-monospace,SF Mono,Cascadia Mono,Menlo,Consolas,monospace}.check{border-radius:var(--radius-sm);border:1px solid var(--line-soft);cursor:pointer;background:#f6f1e499;align-items:flex-start;gap:9px;padding:9px 11px;font-size:13px;line-height:1.5;display:flex}.check input{width:19px;height:19px;accent-color:var(--teal-700);flex:none;margin:1px 0 0}.trusted-lan{background:var(--amber-soft);border-color:#c8892a4d;margin-top:8px}.check-list{flex-direction:column;gap:6px;display:flex}.info-list{border-radius:var(--radius-sm);border:1px solid var(--line-soft);flex-direction:column;gap:0;margin:0;display:flex;overflow:hidden}.info-row{border-bottom:1px solid var(--line-soft);background:#f6f1e473;justify-content:space-between;align-items:baseline;gap:12px;padding:9px 12px;font-size:13px;display:flex}.info-row:last-child{border-bottom:none}.info-row dt{color:var(--muted);flex:none}.info-row dd{text-align:right;overflow-wrap:anywhere;margin:0;font-weight:600}.status-line{border-radius:var(--radius-sm);background:var(--teal-50);color:var(--teal-800);border:1px solid #13837b2e;align-items:center;gap:8px;padding:10px 12px;font-size:13px;display:flex}.dot{background:var(--muted);border-radius:50%;flex:none;width:9px;height:9px}.dot.ok{background:var(--green);box-shadow:0 0 0 3px #1f7a4d29}.dot.bad{background:var(--red);box-shadow:0 0 0 3px #b23b3224}.spinner{border:2px solid #13837b40;border-top-color:var(--teal-700);border-radius:50%;flex:none;width:14px;height:14px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.onboarding{max-width:560px;padding:calc(28px + var(--safe-top)) calc(18px + var(--safe-right)) calc(36px + var(--safe-bottom)) calc(18px + var(--safe-left));flex-direction:column;gap:18px;margin:0 auto;display:flex}.onboarding-head{flex-direction:column;gap:12px;display:flex}.lede{color:var(--ink-soft);font-size:14px;line-height:1.65}.pair-card{border-radius:var(--radius-lg);background:var(--paper);border:1px solid var(--line-soft);box-shadow:var(--shadow-md);flex-direction:column;gap:10px;padding:18px;display:flex}.pair-card h1{font-size:20px}.pair-form{flex-direction:column;gap:14px;margin-top:4px;display:flex}.pair-status:empty{display:none}.demo-card{border-radius:var(--radius-lg);background:linear-gradient(165deg,#fffdf7,#fdf6e6);border:1px dashed #c8892a73;flex-direction:column;gap:9px;padding:16px;display:flex}.demo-card h2{font-size:16px}.demo-card p{color:var(--ink-soft);font-size:13px;line-height:1.6}.demo-card .mode-pill{align-self:flex-start}.security-note{border-radius:var(--radius);border:1px solid var(--line-soft);background:#fffdf7b3;flex-direction:column;gap:8px;padding:15px 16px;display:flex}.security-note h2{color:var(--ink-soft);align-items:center;gap:7px;font-size:14px;display:flex}.security-note h2 svg{color:var(--amber)}.security-note ul,.plain-list{color:var(--muted);flex-direction:column;gap:6px;margin:0;padding-left:20px;font-size:12.5px;line-height:1.6;display:flex}.learn-screen{gap:12px}.learn-top{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.learn-top .early-finish{min-height:32px;color:var(--muted);flex:none;font-size:12px}.learn-body,.item-article{flex-direction:column;gap:14px;display:flex}.item-head{flex-direction:column;gap:5px;display:flex}.item-head h1{letter-spacing:-.02em;font-size:22px;line-height:1.35}.item-head h1:focus{outline:none}.item-meta{color:var(--muted);font-size:12.5px}.task-line{border-radius:var(--radius-sm);border:1px solid var(--line-soft);color:var(--ink-soft);background:#fffdf7cc;align-items:flex-start;gap:8px;padding:10px 12px;font-size:13.5px;line-height:1.6;display:flex}.task-line .pill{flex:none;margin-top:1px}.lesson-block{border-radius:var(--radius);background:var(--paper);border:1px solid var(--line-soft);box-shadow:var(--shadow-sm);flex-direction:column;gap:14px;padding:16px;display:flex}.steps-block{border-top:1px dashed var(--line);flex-direction:column;gap:12px;padding-top:12px;display:flex}.step-count{letter-spacing:.04em;color:var(--teal-600);text-transform:none;margin-bottom:4px;font-size:11.5px;font-weight:700}.step-reading{font-size:14.5px}.predict-block{flex-direction:column;gap:10px;display:flex}.predict-reveal{border-top:1px dashed var(--line);flex-direction:column;gap:8px;padding-top:10px;font-size:14px;display:flex}.reading{color:var(--ink);overflow-wrap:anywhere;font-size:15px;line-height:1.75}.reading>:first-child{margin-top:0}.reading>:last-child{margin-bottom:0}.reading p{margin:0 0 .7em}.reading h1,.reading h2,.reading h3,.reading h4{margin:1em 0 .4em;font-size:16px}.reading ul,.reading ol{margin:0 0 .7em;padding-left:1.35em}.reading li{margin:.2em 0}.reading blockquote{border-left:3px solid var(--teal-500);background:var(--teal-50);color:var(--ink-soft);border-radius:0 8px 8px 0;margin:.7em 0;padding:6px 12px}.reading code{background:#e2dac78c;border-radius:5px;padding:1px 5px;font-family:ui-monospace,SF Mono,Cascadia Mono,Menlo,Consolas,monospace;font-size:.9em}.reading pre,.code-block{border-radius:var(--radius-sm);color:#e9f3f0;background:#12302d;margin:.7em 0;padding:12px;font-size:13px;line-height:1.6;overflow-x:auto}.reading pre code,pre.code-block{color:inherit;font-size:inherit;white-space:pre;background:0 0;padding:0}.reading table{border-collapse:collapse;width:100%;margin:.7em 0;font-size:13.5px;display:block;overflow-x:auto}.reading th,.reading td{border:1px solid var(--line);text-align:left;vertical-align:top;padding:7px 9px}.reading th{background:var(--cream);font-weight:700}.reading img{border-radius:10px;max-width:100%;height:auto}.reading a{word-break:break-word}.diagram-fallback{border-radius:var(--radius-sm);border:1px dashed var(--line);background:#f6f1e480;margin:.7em 0;padding:10px 12px}.diagram-caption{color:var(--muted);margin-bottom:6px;font-size:12px}.diagram-fallback pre{color:#e9f3f0;background:#12302d;border-radius:8px;margin:0;padding:10px;font-size:12px;overflow-x:auto}.katex-display{padding:2px 0;overflow:auto hidden}.question-card{gap:12px}.answer-title{align-items:baseline;gap:8px;font-size:17px;display:flex}.answer-title .muted{font-size:12.5px;font-weight:500}.question-stem{font-size:15.5px}.question-material{border-radius:var(--radius-sm);background:var(--cream);border:1px solid var(--line-soft);padding:11px 13px;font-size:14px}.options{flex-direction:column;gap:8px;display:flex}.option{text-align:left;border:1.5px solid var(--line);background:var(--paper);cursor:pointer;-webkit-tap-highlight-color:transparent;border-radius:12px;align-items:flex-start;gap:10px;width:100%;min-height:52px;padding:12px 13px;transition:border-color .15s,background .15s;display:flex}.option:active:not(:disabled){background:#fffefa}.option[aria-pressed=true]{border-color:var(--teal-600);background:var(--teal-50);box-shadow:0 0 0 1px var(--teal-600) inset}.option .letter{background:var(--cream-deep);width:26px;height:26px;color:var(--ink-soft);border-radius:8px;flex:none;place-items:center;font-size:13px;font-weight:700;display:grid}.option[aria-pressed=true] .letter{background:var(--teal-700);color:#fdfbf3}.option-text{flex:auto;min-width:0;font-size:14.5px;line-height:1.6}.option-text p{margin:0}.option.correct{border-color:var(--green);background:var(--green-soft)}.option.correct .letter{background:var(--green);color:#fff}.option.wrong{border-color:var(--red);background:var(--red-soft)}.option.wrong .letter{background:var(--red);color:#fff}.option.unknown{border-style:dashed;min-height:44px}.option.unknown .letter{border:1px dashed var(--muted);color:var(--muted);background:0 0}.option.chosen-unknown{border-color:var(--amber);background:var(--amber-soft)}.option:disabled{cursor:default;opacity:1}.code-lines{border-radius:var(--radius-sm);border:1px solid var(--line);background:#12302d;flex-direction:column;gap:2px;display:flex;overflow:hidden}.code-line{color:#e9f3f0;text-align:left;cursor:pointer;background:0 0;border:none;border-left:3px solid #0000;align-items:flex-start;gap:10px;min-height:34px;padding:8px 11px;font-family:ui-monospace,SF Mono,Cascadia Mono,Menlo,Consolas,monospace;font-size:12.5px;line-height:1.6;display:flex}.code-line .ln{text-align:right;color:#e9f3f073;font-variant-numeric:tabular-nums;flex:none;width:20px}.code-line code{white-space:pre-wrap;overflow-wrap:anywhere;background:0 0;padding:0}.code-line[aria-pressed=true]{border-left-color:var(--teal-500);background:#13837b59}.code-line.correct{background:#1f7a4d66;border-left-color:#5ec98e}.code-line.wrong{background:#b23b325c;border-left-color:#e88a80}.code-line:disabled{cursor:default}.ai-note{color:var(--amber);font-size:12px}.result-card{border-left:4px solid var(--line);gap:10px}.result-card.ok{border-left-color:var(--green);background:linear-gradient(165deg,#fffdf7,#f2faf5)}.result-card.bad{border-left-color:var(--amber);background:linear-gradient(165deg,#fffdf7,#fdf7e8)}.result-verdict{font-size:16px;font-weight:700;line-height:1.45}.result-card.ok .result-verdict{color:var(--green)}.result-card.bad .result-verdict{color:#8a5a12}.result-feedback,.result-explanation{font-size:14px}.reference{border-radius:var(--radius-sm);border:1px solid var(--line-soft);background:#f6f1e480;padding:9px 11px}.reference summary{cursor:pointer;color:var(--ink-soft);font-size:13px;font-weight:600}.reference pre{white-space:pre-wrap;color:#e9f3f0;background:#12302d;border-radius:8px;margin:8px 0 0;padding:10px;font-size:12.5px}.rating{border-radius:var(--radius-sm);background:var(--teal-50);border:1px solid #13837b33;flex-wrap:wrap;align-items:center;gap:8px;padding:12px;display:flex}.rating-label{color:var(--teal-800);font-size:13.5px;font-weight:600}.rating-btn{background:var(--paper);min-width:78px;min-height:44px;color:var(--teal-800);border-color:#13837b4d;flex:auto}.rating-btn:disabled{opacity:.6}.rating .muted.small{flex-basis:100%}.summary-body{padding-top:4px}.summary-card{background:linear-gradient(165deg, #fff, var(--teal-50));box-shadow:var(--shadow-md);border-color:#13837b52;align-items:flex-start;gap:12px;padding:22px 18px}.summary-mark{background:linear-gradient(150deg, var(--teal-600), var(--teal-800));color:#fdfbf3;border-radius:14px;place-items:center;width:46px;height:46px;display:grid}.summary-card h1{letter-spacing:-.02em;font-size:24px}.summary-line{color:var(--ink-soft);font-size:15px}.summary-card .summary-list{width:100%;margin-top:4px}.summary-card .actions-row{width:100%}.bottom-nav{z-index:25;padding:6px calc(8px + var(--safe-right)) calc(6px + var(--safe-bottom)) calc(8px + var(--safe-left));min-height:var(--nav-height);-webkit-backdrop-filter:blur(14px);border-top:1px solid var(--line);background:#fffdf7f0;justify-content:space-around;align-items:stretch;gap:2px;display:flex;position:fixed;bottom:0;left:0;right:0}.nav-item{min-width:0;min-height:48px;color:var(--muted);cursor:pointer;-webkit-tap-highlight-color:transparent;background:0 0;border:none;border-radius:12px;flex-direction:column;flex:1 1 0;justify-content:center;align-items:center;gap:2px;padding:5px 2px;transition:color .15s,background .15s;display:flex}.nav-item .nav-label{letter-spacing:.02em;font-size:11px;font-weight:600}.nav-item.active{color:var(--teal-800);background:var(--teal-50)}.nav-item.active svg{stroke-width:2.2px}.nav-item:active{background:#13837b1a}@media (width>=600px){body{font-size:16px}.app-main{max-width:780px;padding-top:22px}.stat-row{gap:12px}.stat{padding:14px 16px}.stat-value{font-size:26px}.bottom-nav{border-radius:20px 20px 0 0;width:100%;max-width:780px;left:50%;transform:translate(-50%);box-shadow:0 -4px 20px #172b2814}}@media (width>=900px){body{background-image:radial-gradient(90% 70% at 50% -20%, #fcf8ee 0%, var(--cream) 50%, #ece3cd 100%)}.app-header{padding-inline:max(24px,50vw - 390px);padding-top:calc(14px + var(--safe-top));padding-bottom:14px}.app-main{max-width:780px;padding-top:26px;padding-bottom:42px}.bottom-nav{border-radius:18px 18px 0 0;max-width:780px;margin:0 auto;position:sticky;bottom:0}.onboarding{max-width:620px;padding-top:calc(48px + var(--safe-top))}.screen{gap:20px}.title-block h1{font-size:29px}.card,.lesson-block{padding:20px}.item-head h1{font-size:26px}.reading{font-size:15.5px}}@media (width>=1200px){.app-main,.bottom-nav{max-width:860px}.app-header{padding-inline:max(32px,50vw - 430px)}}@media (height<=520px) and (orientation:landscape){.app-header,.banner-host{position:static}.app-main{padding-bottom:calc(var(--nav-height) + var(--safe-bottom) + 18px)}}@media (prefers-reduced-motion:reduce){.spinner{animation-duration:2s}.btn,.option,.nav-item,.progress-fill{transition:none}}@media (forced-colors:active){.btn,.card,.option,.input,.textarea{border:1px solid buttontext}}@font-face{font-display:block;font-family:KaTeX_AMS;font-style:normal;font-weight:400;src:url(./KaTeX_AMS-Regular-BQhdFMY1.woff2)format("woff2"),url(./KaTeX_AMS-Regular-DMm9YOAa.woff)format("woff"),url(./KaTeX_AMS-Regular-DRggAlZN.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:700;src:url(./KaTeX_Caligraphic-Bold-Dq_IR9rO.woff2)format("woff2"),url(./KaTeX_Caligraphic-Bold-BEiXGLvX.woff)format("woff"),url(./KaTeX_Caligraphic-Bold-ATXxdsX0.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:400;src:url(./KaTeX_Caligraphic-Regular-Di6jR-x-.woff2)format("woff2"),url(./KaTeX_Caligraphic-Regular-CTRA-rTL.woff)format("woff"),url(./KaTeX_Caligraphic-Regular-wX97UBjC.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:700;src:url(./KaTeX_Fraktur-Bold-CL6g_b3V.woff2)format("woff2"),url(./KaTeX_Fraktur-Bold-BsDP51OF.woff)format("woff"),url(./KaTeX_Fraktur-Bold-BdnERNNW.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:400;src:url(./KaTeX_Fraktur-Regular-CTYiF6lA.woff2)format("woff2"),url(./KaTeX_Fraktur-Regular-Dxdc4cR9.woff)format("woff"),url(./KaTeX_Fraktur-Regular-CB_wures.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:700;src:url(./KaTeX_Main-Bold-Cx986IdX.woff2)format("woff2"),url(./KaTeX_Main-Bold-Jm3AIy58.woff)format("woff"),url(./KaTeX_Main-Bold-waoOVXN0.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:700;src:url(./KaTeX_Main-BoldItalic-DxDJ3AOS.woff2)format("woff2"),url(./KaTeX_Main-BoldItalic-SpSLRI95.woff)format("woff"),url(./KaTeX_Main-BoldItalic-DzxPMmG6.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:400;src:url(./KaTeX_Main-Italic-NWA7e6Wa.woff2)format("woff2"),url(./KaTeX_Main-Italic-BMLOBm91.woff)format("woff"),url(./KaTeX_Main-Italic-3WenGoN9.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:400;src:url(./KaTeX_Main-Regular-B22Nviop.woff2)format("woff2"),url(./KaTeX_Main-Regular-Dr94JaBh.woff)format("woff"),url(./KaTeX_Main-Regular-ypZvNtVU.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:700;src:url(./KaTeX_Math-BoldItalic-CZnvNsCZ.woff2)format("woff2"),url(./KaTeX_Math-BoldItalic-iY-2wyZ7.woff)format("woff"),url(./KaTeX_Math-BoldItalic-B3XSjfu4.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:400;src:url(./KaTeX_Math-Italic-t53AETM-.woff2)format("woff2"),url(./KaTeX_Math-Italic-DA0__PXp.woff)format("woff"),url(./KaTeX_Math-Italic-flOr_0UB.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:700;src:url(./KaTeX_SansSerif-Bold-D1sUS0GD.woff2)format("woff2"),url(./KaTeX_SansSerif-Bold-DbIhKOiC.woff)format("woff"),url(./KaTeX_SansSerif-Bold-CFMepnvq.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:italic;font-weight:400;src:url(./KaTeX_SansSerif-Italic-C3H0VqGB.woff2)format("woff2"),url(./KaTeX_SansSerif-Italic-DN2j7dab.woff)format("woff"),url(./KaTeX_SansSerif-Italic-YYjJ1zSn.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:400;src:url(./KaTeX_SansSerif-Regular-DDBCnlJ7.woff2)format("woff2"),url(./KaTeX_SansSerif-Regular-CS6fqUqJ.woff)format("woff"),url(./KaTeX_SansSerif-Regular-BNo7hRIc.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Script;font-style:normal;font-weight:400;src:url(./KaTeX_Script-Regular-D3wIWfF6.woff2)format("woff2"),url(./KaTeX_Script-Regular-D5yQViql.woff)format("woff"),url(./KaTeX_Script-Regular-C5JkGWo-.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size1;font-style:normal;font-weight:400;src:url(./KaTeX_Size1-Regular-mCD8mA8B.woff2)format("woff2"),url(./KaTeX_Size1-Regular-C195tn64.woff)format("woff"),url(./KaTeX_Size1-Regular-Dbsnue_I.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size2;font-style:normal;font-weight:400;src:url(./KaTeX_Size2-Regular-Dy4dx90m.woff2)format("woff2"),url(./KaTeX_Size2-Regular-oD1tc_U0.woff)format("woff"),url(./KaTeX_Size2-Regular-B7gKUWhC.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size3;font-style:normal;font-weight:400;src:url(data:font/woff2;base64,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)format("woff2"),url(./KaTeX_Size3-Regular-CTq5MqoE.woff)format("woff"),url(./KaTeX_Size3-Regular-DgpXs0kz.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size4;font-style:normal;font-weight:400;src:url(./KaTeX_Size4-Regular-Dl5lxZxV.woff2)format("woff2"),url(./KaTeX_Size4-Regular-BF-4gkZK.woff)format("woff"),url(./KaTeX_Size4-Regular-DWFBv043.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Typewriter;font-style:normal;font-weight:400;src:url(./KaTeX_Typewriter-Regular-CO6r4hn1.woff2)format("woff2"),url(./KaTeX_Typewriter-Regular-C0xS9mPB.woff)format("woff"),url(./KaTeX_Typewriter-Regular-D3Ib7_Hf.ttf)format("truetype")}.katex{text-indent:0;text-rendering:auto;font:1.21em/1.2 KaTeX_Main,Times New Roman,serif;position:relative}.katex *{border-color:currentColor;-ms-high-contrast-adjust:none!important}.katex .katex-version:after{content:"0.16.47"}.katex .katex-mathml{clip-path:inset(50%);border:0;width:1px;height:1px;padding:0;position:absolute;overflow:hidden}.katex .katex-html>.newline{display:block}.katex .base{white-space:nowrap;width:min-content;position:relative}.katex .base,.katex .strut{display:inline-block}.katex .textbf{font-weight:700}.katex .textit{font-style:italic}.katex .textrm{font-family:KaTeX_Main}.katex .textsf{font-family:KaTeX_SansSerif}.katex .texttt{font-family:KaTeX_Typewriter}.katex .mathnormal{font-family:KaTeX_Math;font-style:italic}.katex .mathit{font-family:KaTeX_Main;font-style:italic}.katex .mathrm{font-style:normal}.katex .mathbf{font-family:KaTeX_Main;font-weight:700}.katex .boldsymbol{font-family:KaTeX_Math;font-style:italic;font-weight:700}.katex .amsrm,.katex .mathbb,.katex .textbb{font-family:KaTeX_AMS}.katex .mathcal{font-family:KaTeX_Caligraphic}.katex .mathfrak,.katex .textfrak{font-family:KaTeX_Fraktur}.katex .mathboldfrak,.katex .textboldfrak{font-family:KaTeX_Fraktur;font-weight:700}.katex .mathtt{font-family:KaTeX_Typewriter}.katex .mathscr,.katex .textscr{font-family:KaTeX_Script}.katex .mathsf,.katex .textsf{font-family:KaTeX_SansSerif}.katex .mathboldsf,.katex .textboldsf{font-family:KaTeX_SansSerif;font-weight:700}.katex .mathitsf,.katex .mathsfit,.katex .textitsf{font-family:KaTeX_SansSerif;font-style:italic}.katex .mainrm{font-family:KaTeX_Main;font-style:normal}.katex .vlist-t{border-collapse:collapse;table-layout:fixed;display:inline-table}.katex .vlist-r{display:table-row}.katex .vlist{vertical-align:bottom;display:table-cell;position:relative}.katex .vlist>span{height:0;display:block;position:relative}.katex .vlist>span>span{display:inline-block}.katex .vlist>span>.pstrut{width:0;overflow:hidden}.katex .vlist-t2{margin-right:-2px}.katex .vlist-s{vertical-align:bottom;width:2px;min-width:2px;font-size:1px;display:table-cell}.katex .vbox{flex-direction:column;align-items:baseline;display:inline-flex}.katex .hbox{width:100%}.katex .hbox,.katex .thinbox{flex-direction:row;display:inline-flex}.katex .thinbox{width:0;max-width:0}.katex .msupsub{text-align:left}.katex .mfrac>span>span{text-align:center}.katex .mfrac .frac-line{border-bottom-style:solid;width:100%;display:inline-block}.katex .hdashline,.katex .hline,.katex .mfrac .frac-line,.katex .overline .overline-line,.katex .rule,.katex .underline .underline-line{min-height:1px}.katex .mspace{display:inline-block}.katex .smash{line-height:0;display:inline}.katex .clap,.katex .llap,.katex .rlap{width:0;position:relative}.katex .clap>.inner,.katex .llap>.inner,.katex .rlap>.inner{position:absolute}.katex .clap>.fix,.katex .llap>.fix,.katex .rlap>.fix{display:inline-block}.katex .llap>.inner{right:0}.katex .clap>.inner,.katex .rlap>.inner{left:0}.katex .clap>.inner>span{margin-left:-50%;margin-right:50%}.katex .rule{border:0 solid;display:inline-block;position:relative}.katex .hline,.katex .overline .overline-line,.katex .underline .underline-line{border-bottom-style:solid;width:100%;display:inline-block}.katex .hdashline{border-bottom-style:dashed;width:100%;display:inline-block}.katex .sqrt>.root{margin-left:.277778em;margin-right:-.555556em}.katex .fontsize-ensurer.reset-size1.size1,.katex .sizing.reset-size1.size1{font-size:1em}.katex .fontsize-ensurer.reset-size1.size2,.katex .sizing.reset-size1.size2{font-size:1.2em}.katex .fontsize-ensurer.reset-size1.size3,.katex .sizing.reset-size1.size3{font-size:1.4em}.katex .fontsize-ensurer.reset-size1.size4,.katex .sizing.reset-size1.size4{font-size:1.6em}.katex .fontsize-ensurer.reset-size1.size5,.katex .sizing.reset-size1.size5{font-size:1.8em}.katex .fontsize-ensurer.reset-size1.size6,.katex .sizing.reset-size1.size6{font-size:2em}.katex .fontsize-ensurer.reset-size1.size7,.katex .sizing.reset-size1.size7{font-size:2.4em}.katex .fontsize-ensurer.reset-size1.size8,.katex .sizing.reset-size1.size8{font-size:2.88em}.katex .fontsize-ensurer.reset-size1.size9,.katex .sizing.reset-size1.size9{font-size:3.456em}.katex .fontsize-ensurer.reset-size1.size10,.katex .sizing.reset-size1.size10{font-size:4.148em}.katex .fontsize-ensurer.reset-size1.size11,.katex .sizing.reset-size1.size11{font-size:4.976em}.katex .fontsize-ensurer.reset-size2.size1,.katex .sizing.reset-size2.size1{font-size:.833333em}.katex .fontsize-ensurer.reset-size2.size2,.katex .sizing.reset-size2.size2{font-size:1em}.katex .fontsize-ensurer.reset-size2.size3,.katex .sizing.reset-size2.size3{font-size:1.16667em}.katex .fontsize-ensurer.reset-size2.size4,.katex .sizing.reset-size2.size4{font-size:1.33333em}.katex .fontsize-ensurer.reset-size2.size5,.katex .sizing.reset-size2.size5{font-size:1.5em}.katex .fontsize-ensurer.reset-size2.size6,.katex .sizing.reset-size2.size6{font-size:1.66667em}.katex .fontsize-ensurer.reset-size2.size7,.katex .sizing.reset-size2.size7{font-size:2em}.katex .fontsize-ensurer.reset-size2.size8,.katex .sizing.reset-size2.size8{font-size:2.4em}.katex .fontsize-ensurer.reset-size2.size9,.katex .sizing.reset-size2.size9{font-size:2.88em}.katex .fontsize-ensurer.reset-size2.size10,.katex .sizing.reset-size2.size10{font-size:3.45667em}.katex .fontsize-ensurer.reset-size2.size11,.katex .sizing.reset-size2.size11{font-size:4.14667em}.katex .fontsize-ensurer.reset-size3.size1,.katex .sizing.reset-size3.size1{font-size:.714286em}.katex .fontsize-ensurer.reset-size3.size2,.katex .sizing.reset-size3.size2{font-size:.857143em}.katex .fontsize-ensurer.reset-size3.size3,.katex .sizing.reset-size3.size3{font-size:1em}.katex .fontsize-ensurer.reset-size3.size4,.katex .sizing.reset-size3.size4{font-size:1.14286em}.katex .fontsize-ensurer.reset-size3.size5,.katex .sizing.reset-size3.size5{font-size:1.28571em}.katex .fontsize-ensurer.reset-size3.size6,.katex .sizing.reset-size3.size6{font-size:1.42857em}.katex .fontsize-ensurer.reset-size3.size7,.katex .sizing.reset-size3.size7{font-size:1.71429em}.katex .fontsize-ensurer.reset-size3.size8,.katex .sizing.reset-size3.size8{font-size:2.05714em}.katex .fontsize-ensurer.reset-size3.size9,.katex .sizing.reset-size3.size9{font-size:2.46857em}.katex .fontsize-ensurer.reset-size3.size10,.katex .sizing.reset-size3.size10{font-size:2.96286em}.katex .fontsize-ensurer.reset-size3.size11,.katex .sizing.reset-size3.size11{font-size:3.55429em}.katex .fontsize-ensurer.reset-size4.size1,.katex .sizing.reset-size4.size1{font-size:.625em}.katex .fontsize-ensurer.reset-size4.size2,.katex .sizing.reset-size4.size2{font-size:.75em}.katex .fontsize-ensurer.reset-size4.size3,.katex .sizing.reset-size4.size3{font-size:.875em}.katex .fontsize-ensurer.reset-size4.size4,.katex .sizing.reset-size4.size4{font-size:1em}.katex .fontsize-ensurer.reset-size4.size5,.katex .sizing.reset-size4.size5{font-size:1.125em}.katex .fontsize-ensurer.reset-size4.size6,.katex .sizing.reset-size4.size6{font-size:1.25em}.katex .fontsize-ensurer.reset-size4.size7,.katex .sizing.reset-size4.size7{font-size:1.5em}.katex .fontsize-ensurer.reset-size4.size8,.katex .sizing.reset-size4.size8{font-size:1.8em}.katex .fontsize-ensurer.reset-size4.size9,.katex .sizing.reset-size4.size9{font-size:2.16em}.katex .fontsize-ensurer.reset-size4.size10,.katex .sizing.reset-size4.size10{font-size:2.5925em}.katex .fontsize-ensurer.reset-size4.size11,.katex .sizing.reset-size4.size11{font-size:3.11em}.katex .fontsize-ensurer.reset-size5.size1,.katex .sizing.reset-size5.size1{font-size:.555556em}.katex .fontsize-ensurer.reset-size5.size2,.katex .sizing.reset-size5.size2{font-size:.666667em}.katex .fontsize-ensurer.reset-size5.size3,.katex .sizing.reset-size5.size3{font-size:.777778em}.katex .fontsize-ensurer.reset-size5.size4,.katex .sizing.reset-size5.size4{font-size:.888889em}.katex .fontsize-ensurer.reset-size5.size5,.katex .sizing.reset-size5.size5{font-size:1em}.katex .fontsize-ensurer.reset-size5.size6,.katex .sizing.reset-size5.size6{font-size:1.11111em}.katex .fontsize-ensurer.reset-size5.size7,.katex .sizing.reset-size5.size7{font-size:1.33333em}.katex .fontsize-ensurer.reset-size5.size8,.katex .sizing.reset-size5.size8{font-size:1.6em}.katex .fontsize-ensurer.reset-size5.size9,.katex .sizing.reset-size5.size9{font-size:1.92em}.katex .fontsize-ensurer.reset-size5.size10,.katex .sizing.reset-size5.size10{font-size:2.30444em}.katex .fontsize-ensurer.reset-size5.size11,.katex .sizing.reset-size5.size11{font-size:2.76444em}.katex .fontsize-ensurer.reset-size6.size1,.katex .sizing.reset-size6.size1{font-size:.5em}.katex .fontsize-ensurer.reset-size6.size2,.katex .sizing.reset-size6.size2{font-size:.6em}.katex .fontsize-ensurer.reset-size6.size3,.katex .sizing.reset-size6.size3{font-size:.7em}.katex .fontsize-ensurer.reset-size6.size4,.katex .sizing.reset-size6.size4{font-size:.8em}.katex .fontsize-ensurer.reset-size6.size5,.katex .sizing.reset-size6.size5{font-size:.9em}.katex .fontsize-ensurer.reset-size6.size6,.katex .sizing.reset-size6.size6{font-size:1em}.katex .fontsize-ensurer.reset-size6.size7,.katex .sizing.reset-size6.size7{font-size:1.2em}.katex .fontsize-ensurer.reset-size6.size8,.katex .sizing.reset-size6.size8{font-size:1.44em}.katex .fontsize-ensurer.reset-size6.size9,.katex .sizing.reset-size6.size9{font-size:1.728em}.katex .fontsize-ensurer.reset-size6.size10,.katex .sizing.reset-size6.size10{font-size:2.074em}.katex .fontsize-ensurer.reset-size6.size11,.katex .sizing.reset-size6.size11{font-size:2.488em}.katex .fontsize-ensurer.reset-size7.size1,.katex .sizing.reset-size7.size1{font-size:.416667em}.katex .fontsize-ensurer.reset-size7.size2,.katex .sizing.reset-size7.size2{font-size:.5em}.katex .fontsize-ensurer.reset-size7.size3,.katex .sizing.reset-size7.size3{font-size:.583333em}.katex .fontsize-ensurer.reset-size7.size4,.katex .sizing.reset-size7.size4{font-size:.666667em}.katex .fontsize-ensurer.reset-size7.size5,.katex .sizing.reset-size7.size5{font-size:.75em}.katex .fontsize-ensurer.reset-size7.size6,.katex .sizing.reset-size7.size6{font-size:.833333em}.katex .fontsize-ensurer.reset-size7.size7,.katex .sizing.reset-size7.size7{font-size:1em}.katex .fontsize-ensurer.reset-size7.size8,.katex .sizing.reset-size7.size8{font-size:1.2em}.katex .fontsize-ensurer.reset-size7.size9,.katex .sizing.reset-size7.size9{font-size:1.44em}.katex .fontsize-ensurer.reset-size7.size10,.katex .sizing.reset-size7.size10{font-size:1.72833em}.katex .fontsize-ensurer.reset-size7.size11,.katex .sizing.reset-size7.size11{font-size:2.07333em}.katex .fontsize-ensurer.reset-size8.size1,.katex .sizing.reset-size8.size1{font-size:.347222em}.katex .fontsize-ensurer.reset-size8.size2,.katex .sizing.reset-size8.size2{font-size:.416667em}.katex .fontsize-ensurer.reset-size8.size3,.katex .sizing.reset-size8.size3{font-size:.486111em}.katex .fontsize-ensurer.reset-size8.size4,.katex .sizing.reset-size8.size4{font-size:.555556em}.katex .fontsize-ensurer.reset-size8.size5,.katex .sizing.reset-size8.size5{font-size:.625em}.katex .fontsize-ensurer.reset-size8.size6,.katex .sizing.reset-size8.size6{font-size:.694444em}.katex .fontsize-ensurer.reset-size8.size7,.katex .sizing.reset-size8.size7{font-size:.833333em}.katex .fontsize-ensurer.reset-size8.size8,.katex .sizing.reset-size8.size8{font-size:1em}.katex .fontsize-ensurer.reset-size8.size9,.katex .sizing.reset-size8.size9{font-size:1.2em}.katex .fontsize-ensurer.reset-size8.size10,.katex .sizing.reset-size8.size10{font-size:1.44028em}.katex .fontsize-ensurer.reset-size8.size11,.katex .sizing.reset-size8.size11{font-size:1.72778em}.katex .fontsize-ensurer.reset-size9.size1,.katex .sizing.reset-size9.size1{font-size:.289352em}.katex .fontsize-ensurer.reset-size9.size2,.katex .sizing.reset-size9.size2{font-size:.347222em}.katex .fontsize-ensurer.reset-size9.size3,.katex .sizing.reset-size9.size3{font-size:.405093em}.katex .fontsize-ensurer.reset-size9.size4,.katex .sizing.reset-size9.size4{font-size:.462963em}.katex .fontsize-ensurer.reset-size9.size5,.katex .sizing.reset-size9.size5{font-size:.520833em}.katex .fontsize-ensurer.reset-size9.size6,.katex .sizing.reset-size9.size6{font-size:.578704em}.katex .fontsize-ensurer.reset-size9.size7,.katex .sizing.reset-size9.size7{font-size:.694444em}.katex .fontsize-ensurer.reset-size9.size8,.katex .sizing.reset-size9.size8{font-size:.833333em}.katex .fontsize-ensurer.reset-size9.size9,.katex .sizing.reset-size9.size9{font-size:1em}.katex .fontsize-ensurer.reset-size9.size10,.katex .sizing.reset-size9.size10{font-size:1.20023em}.katex .fontsize-ensurer.reset-size9.size11,.katex .sizing.reset-size9.size11{font-size:1.43981em}.katex .fontsize-ensurer.reset-size10.size1,.katex .sizing.reset-size10.size1{font-size:.24108em}.katex .fontsize-ensurer.reset-size10.size2,.katex .sizing.reset-size10.size2{font-size:.289296em}.katex .fontsize-ensurer.reset-size10.size3,.katex .sizing.reset-size10.size3{font-size:.337512em}.katex .fontsize-ensurer.reset-size10.size4,.katex .sizing.reset-size10.size4{font-size:.385728em}.katex .fontsize-ensurer.reset-size10.size5,.katex .sizing.reset-size10.size5{font-size:.433944em}.katex .fontsize-ensurer.reset-size10.size6,.katex .sizing.reset-size10.size6{font-size:.48216em}.katex .fontsize-ensurer.reset-size10.size7,.katex .sizing.reset-size10.size7{font-size:.578592em}.katex .fontsize-ensurer.reset-size10.size8,.katex .sizing.reset-size10.size8{font-size:.694311em}.katex .fontsize-ensurer.reset-size10.size9,.katex .sizing.reset-size10.size9{font-size:.833173em}.katex .fontsize-ensurer.reset-size10.size10,.katex .sizing.reset-size10.size10{font-size:1em}.katex .fontsize-ensurer.reset-size10.size11,.katex .sizing.reset-size10.size11{font-size:1.19961em}.katex .fontsize-ensurer.reset-size11.size1,.katex .sizing.reset-size11.size1{font-size:.200965em}.katex .fontsize-ensurer.reset-size11.size2,.katex .sizing.reset-size11.size2{font-size:.241158em}.katex .fontsize-ensurer.reset-size11.size3,.katex .sizing.reset-size11.size3{font-size:.281351em}.katex .fontsize-ensurer.reset-size11.size4,.katex .sizing.reset-size11.size4{font-size:.321543em}.katex .fontsize-ensurer.reset-size11.size5,.katex .sizing.reset-size11.size5{font-size:.361736em}.katex .fontsize-ensurer.reset-size11.size6,.katex .sizing.reset-size11.size6{font-size:.401929em}.katex .fontsize-ensurer.reset-size11.size7,.katex .sizing.reset-size11.size7{font-size:.482315em}.katex .fontsize-ensurer.reset-size11.size8,.katex .sizing.reset-size11.size8{font-size:.578778em}.katex .fontsize-ensurer.reset-size11.size9,.katex .sizing.reset-size11.size9{font-size:.694534em}.katex .fontsize-ensurer.reset-size11.size10,.katex .sizing.reset-size11.size10{font-size:.833601em}.katex .fontsize-ensurer.reset-size11.size11,.katex .sizing.reset-size11.size11{font-size:1em}.katex .delimsizing.size1{font-family:KaTeX_Size1}.katex .delimsizing.size2{font-family:KaTeX_Size2}.katex .delimsizing.size3{font-family:KaTeX_Size3}.katex .delimsizing.size4{font-family:KaTeX_Size4}.katex .delimsizing.mult .delim-size1>span{font-family:KaTeX_Size1}.katex .delimsizing.mult .delim-size4>span{font-family:KaTeX_Size4}.katex .nulldelimiter{width:.12em;display:inline-block}.katex .delimcenter,.katex .op-symbol{position:relative}.katex .op-symbol.small-op{font-family:KaTeX_Size1}.katex .op-symbol.large-op{font-family:KaTeX_Size2}.katex .accent>.vlist-t,.katex .op-limits>.vlist-t{text-align:center}.katex .accent .accent-body{position:relative}.katex .accent .accent-body:not(.accent-full){width:0}.katex .overlay{display:block}.katex .mtable .vertical-separator{min-width:1px;display:inline-block}.katex .mtable .arraycolsep{display:inline-block}.katex .mtable .col-align-c>.vlist-t{text-align:center}.katex .mtable .col-align-l>.vlist-t{text-align:left}.katex .mtable .col-align-r>.vlist-t{text-align:right}.katex .svg-align{text-align:left}.katex svg{fill:currentColor;stroke:currentColor;height:inherit;width:100%;display:block;position:absolute}.katex svg path{stroke:none}.katex svg{fill-rule:nonzero;fill-opacity:1;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1}.katex img{border-style:none;min-width:0;max-width:none;min-height:0;max-height:none}.katex .stretchy{width:100%;display:block;position:relative;overflow:hidden}.katex .stretchy:after,.katex .stretchy:before{content:""}.katex .hide-tail{width:100%;position:relative;overflow:hidden}.katex .halfarrow-left{width:50.2%;position:absolute;left:0;overflow:hidden}.katex .halfarrow-right{width:50.2%;position:absolute;right:0;overflow:hidden}.katex .brace-left{width:25.1%;position:absolute;left:0;overflow:hidden}.katex .brace-center{width:50%;position:absolute;left:25%;overflow:hidden}.katex .brace-right{width:25.1%;position:absolute;right:0;overflow:hidden}.katex .x-arrow-pad{padding:0 .5em}.katex .cd-arrow-pad{padding:0 .55556em 0 .27778em}.katex .mover,.katex .munder,.katex .x-arrow{text-align:center}.katex .boxpad{padding:0 .3em}.katex .fbox,.katex .fcolorbox{box-sizing:border-box;border:.04em solid}.katex .cancel-pad{padding:0 .2em}.katex .cancel-lap{margin-left:-.2em;margin-right:-.2em}.katex .sout{border-bottom-style:solid;border-bottom-width:.08em}.katex .angl{box-sizing:border-box;border-top:.049em solid;border-right:.049em solid;margin-right:.03889em}.katex .anglpad{padding:0 .03889em}.katex .eqn-num:before{content:"(" counter(katexEqnNo) ")";counter-increment:katexEqnNo}.katex .mml-eqn-num:before{content:"(" counter(mmlEqnNo) ")";counter-increment:mmlEqnNo}.katex .mtr-glue{width:50%}.katex .cd-vert-arrow{display:inline-block;position:relative}.katex .cd-label-left{text-align:left;display:inline-block;position:absolute;right:calc(50% + .3em)}.katex .cd-label-right{text-align:right;display:inline-block;position:absolute;left:calc(50% + .3em)}.katex-display{text-align:center;margin:1em 0;display:block}.katex-display>.katex{text-align:center;white-space:nowrap;display:block}.katex-display>.katex>.katex-html{display:block;position:relative}.katex-display>.katex>.katex-html>.tag{position:absolute;right:0}.katex-display.leqno>.katex>.katex-html>.tag{left:0;right:auto}.katex-display.fleqn>.katex{text-align:left;padding-left:2em}body{counter-reset:katexEqnNo mmlEqnNo}
