.nb{--nb-dim: 82%;--nb-paper: color-mix(in srgb, #fbfaf3 var(--nb-dim), #000);--nb-paper-edge: color-mix(in srgb, #f0eee1 var(--nb-dim), #000);--nb-grid: color-mix(in srgb, #ccd9e8 var(--nb-dim), #000);--nb-grid-strong: color-mix(in srgb, #b3c8de var(--nb-dim), #000);--nb-margin: color-mix(in srgb, #e0575a var(--nb-dim), #000);--nb-ink: color-mix(in srgb, #1d2430 var(--nb-dim), #000);--nb-ink-soft: color-mix(in srgb, #5a6675 var(--nb-dim), #000);--nb-blue: color-mix(in srgb, #24409a var(--nb-dim), #000);--nb-marker: color-mix(in srgb, #ffd86b var(--nb-dim), #000);--nb-marker-2: color-mix(in srgb, #ffb27a var(--nb-dim), #000);--nb-green: color-mix(in srgb, #1d8f6a var(--nb-dim), #000);--nb-red: color-mix(in srgb, #d94436 var(--nb-dim), #000);color:var(--nb-ink);font-family:Spectral,Georgia,serif;display:grid;grid-template-columns:232px minmax(0,1fr);gap:22px;align-items:start}@media(max-width:900px){.nb{grid-template-columns:minmax(0,1fr)}}.nb-toc{position:sticky;top:14px;max-height:calc(100vh - 40px);overflow-y:auto;background:var(--nb-paper-edge);border:1.5px solid var(--nb-grid-strong);border-radius:3px;padding:12px 10px 16px;box-shadow:3px 3px #1d24301a}@media(max-width:900px){.nb-toc{position:static;max-height:260px}}.nb-toc h3{margin:0 0 8px;font-family:Spline Sans Mono,monospace;font-size:10px;letter-spacing:1.2px;text-transform:uppercase;color:var(--nb-ink-soft)}.nb-toc-group{font-family:Spline Sans Mono,monospace;font-size:10px;letter-spacing:1px;text-transform:uppercase;color:var(--nb-margin);margin:12px 0 4px}.nb-toc a,.nb-toc button{display:flex;align-items:baseline;gap:7px;width:100%;padding:3px 6px;border:0;background:none;border-radius:2px;font:inherit;font-size:14px;color:var(--nb-ink);text-align:left;text-decoration:none;cursor:pointer}.nb-toc a:hover,.nb-toc button:hover{background:var(--nb-marker)}.nb-toc .num{font-family:Spline Sans Mono,monospace;font-size:10px;color:var(--nb-ink-soft);min-width:22px}.nb-toc .cnt{margin-left:auto;font-family:Spline Sans Mono,monospace;font-size:10px;color:var(--nb-ink-soft)}.nb-toc a.done .num:after{content:" ✓";color:var(--nb-green)}.nb-sheet{position:relative;min-width:0;background-color:var(--nb-paper);background-image:linear-gradient(var(--nb-grid) 1px,transparent 1px),linear-gradient(90deg,var(--nb-grid) 1px,transparent 1px);background-size:21px 21px;border:1.5px solid var(--nb-grid-strong);border-radius:2px;box-shadow:5px 5px #1d24301f;padding:20px 22px 40px 68px}.nb-sheet:before{content:"";position:absolute;left:46px;top:0;bottom:0;width:1.5px;background:var(--nb-margin);opacity:.55}@media(max-width:600px){.nb-sheet{padding:16px 12px 28px 34px}.nb-sheet:before{left:22px}}.nb-bar{grid-column:1 / -1;display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:4px}.nb-switch{display:inline-flex;border:1.5px solid var(--nb-ink);border-radius:3px;overflow:hidden;background:var(--nb-paper)}.nb-switch button{border:0;background:none;padding:6px 13px;font-family:Spline Sans Mono,monospace;font-size:11px;letter-spacing:.4px;text-transform:uppercase;color:var(--nb-ink)}.nb-switch button+button{border-left:1.5px solid var(--nb-ink)}.nb-switch button.on{background:var(--nb-ink);color:var(--nb-paper)}.nb-search{flex:1 1 190px;min-width:150px;padding:7px 11px;border:1.5px solid var(--nb-grid-strong);border-radius:3px;background:var(--nb-paper);font-family:Spectral,Georgia,serif;font-size:14px;color:var(--nb-ink);outline:none}.nb-search:focus{border-color:var(--nb-blue)}.nb-ru{border:1.5px solid var(--nb-ink);border-radius:3px;background:var(--nb-paper);padding:6px 13px;font-family:Spline Sans Mono,monospace;font-size:11px;letter-spacing:.4px;color:var(--nb-ink)}.nb-ru.on{background:var(--nb-marker)}.nb-print{border:1.5px solid var(--nb-grid-strong);border-radius:3px;background:var(--nb-paper);padding:6px 13px;font-family:Spline Sans Mono,monospace;font-size:11px;color:var(--nb-ink-soft)}.nb-meter{display:flex;align-items:center;gap:8px;font-family:Spline Sans Mono,monospace;font-size:11px;color:var(--nb-ink-soft)}.nb-meter-track{width:84px;height:12px;border:1.5px solid var(--nb-grid-strong);background:repeating-linear-gradient(90deg,transparent 0 11px,var(--nb-grid) 11px 12px)}.nb-meter-fill{height:100%;background:var(--nb-marker)}.nb-lesson{margin-bottom:34px;scroll-margin-top:16px}.nb-lesson-head{display:flex;align-items:baseline;gap:12px;margin-bottom:14px}.nb-lesson-head .idx{font-family:Caveat,cursive;font-size:26px;font-weight:700;color:var(--nb-margin);margin-left:-44px;width:36px;text-align:right}@media(max-width:600px){.nb-lesson-head .idx{margin-left:-26px;width:22px;font-size:20px}}.nb-lesson-head .date{font-family:Caveat,cursive;font-size:25px;font-weight:700;color:var(--nb-blue);text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:4px}.nb-lesson-head .cnt{margin-left:auto;font-family:Spline Sans Mono,monospace;font-size:10px;color:var(--nb-ink-soft)}.nb-card{margin:0 0 22px;padding-bottom:14px;border-bottom:1px dashed var(--nb-grid-strong);animation:nb-rise .36s ease both}@keyframes nb-rise{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.nb-card.copied{opacity:.62}.nb-card h4{margin:0 0 3px;font-size:20px;font-weight:600;line-height:1.25;background:linear-gradient(transparent 58%,var(--nb-marker) 58%,var(--nb-marker) 94%,transparent 94%);display:inline;box-decoration-break:clone;-webkit-box-decoration-break:clone}.nb-card .title-ru{margin:4px 0 0;font-family:Caveat,cursive;font-size:19px;color:var(--nb-ink-soft)}.nb-meta{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin:8px 0 12px}.nb-rubric{font-family:Spline Sans Mono,monospace;font-size:9.5px;letter-spacing:.8px;text-transform:uppercase;padding:2px 7px;border:1.2px solid var(--nb-blue);color:var(--nb-blue);border-radius:2px}.nb-tag{font-family:Spline Sans Mono,monospace;font-size:10px;color:var(--nb-ink-soft)}.nb-tag:before{content:"#";opacity:.5}.nb-body{margin:0 0 12px}.nb-table{border-collapse:collapse;width:100%;font-size:15px;background:color-mix(in srgb,var(--nb-paper) 85%,transparent)}.nb-table th,.nb-table td{border:1.2px solid var(--nb-ink);padding:6px 9px;text-align:left;vertical-align:top}.nb-table th{font-family:Spline Sans Mono,monospace;font-size:10.5px;letter-spacing:.6px;text-transform:uppercase;background:var(--nb-marker);font-weight:600}.nb-scroll{overflow-x:auto}.nb-formula{display:grid;gap:8px}.nb-formula-row{display:grid;grid-template-columns:minmax(120px,max-content) minmax(0,1fr);gap:4px 14px;align-items:baseline;padding-left:12px;border-left:3px solid var(--nb-blue)}.nb-formula-row .pat{grid-row:span 2;font-family:Spline Sans Mono,monospace;font-weight:600;font-size:15px;color:var(--nb-blue)}.nb-formula-row .mean{font-size:15px}.nb-formula-row .ex{font-size:14px;font-style:italic;color:var(--nb-ink-soft)}.nb-contrast{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1.2px solid var(--nb-ink)}@media(max-width:560px){.nb-contrast{grid-template-columns:1fr}}.nb-contrast>div{padding:9px 11px}.nb-contrast>div+div{border-left:1.2px solid var(--nb-ink)}@media(max-width:560px){.nb-contrast>div+div{border-left:0;border-top:1.2px solid var(--nb-ink)}}.nb-contrast b{display:block;font-family:Spline Sans Mono,monospace;font-size:11px;letter-spacing:.6px;text-transform:uppercase;margin-bottom:6px}.nb-contrast ul{margin:0;padding-left:17px;font-size:15px}.nb-contrast .rule{grid-column:1 / -1;border-top:1.2px solid var(--nb-ink);border-left:0;background:color-mix(in srgb,var(--nb-marker) 35%,transparent)}.nb-list{margin:0;padding-left:19px;font-size:15px;line-height:1.55}.nb-dialogue{display:grid;gap:5px;font-size:15px}.nb-dialogue .who{font-family:Spline Sans Mono,monospace;font-size:11px;font-weight:600;color:var(--nb-margin);margin-right:8px}.nb-scale{display:grid;gap:6px}.nb-scale-ends{display:flex;justify-content:space-between;font-family:Spline Sans Mono,monospace;font-size:10px;color:var(--nb-ink-soft)}.nb-scale-steps{display:flex;flex-wrap:wrap;gap:6px;border-top:2px solid var(--nb-ink);padding-top:8px}.nb-scale-step{font-size:14px}.nb-scale-step small{display:block;font-family:Spline Sans Mono,monospace;font-size:10px;color:var(--nb-ink-soft)}.nb-ex{margin:10px 0 0;display:grid;gap:4px}.nb-ex li{list-style:none;font-size:15px}.nb-ex .en:before{content:"→ ";color:var(--nb-green)}.nb-ex .ru{display:block;font-family:Caveat,cursive;font-size:17px;color:var(--nb-ink-soft);padding-left:18px}.nb-pitfall{margin:10px 0 0;font-family:Caveat,cursive;font-size:19px;color:var(--nb-red);line-height:1.35}.nb-pitfall:before{content:"✗ ";font-family:Spectral,serif;font-size:15px}.nb-source{margin:8px 0 0;font-family:Spline Sans Mono,monospace;font-size:10px;color:var(--nb-ink-soft)}.nb-repeat{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px;margin:0 0 16px;padding:6px 10px;border:1.2px dashed var(--nb-grid-strong);border-radius:2px;background:color-mix(in srgb,var(--nb-paper) 70%,transparent);font-size:14px;color:var(--nb-ink-soft)}.nb-repeat .mark{font-family:Spline Sans Mono,monospace;font-size:12px;color:var(--nb-margin)}.nb-repeat .adds{font-family:Caveat,cursive;font-size:17px;color:var(--nb-ink)}.nb-foot{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:12px}.nb-check{display:inline-flex;align-items:center;gap:7px;border:0;background:none;padding:0;font-family:Spline Sans Mono,monospace;font-size:11px;letter-spacing:.3px;color:var(--nb-ink-soft)}.nb-check .box{width:19px;height:19px;border:1.6px solid var(--nb-ink);border-radius:2px;background:var(--nb-paper);display:grid;place-items:center}.nb-check.on{color:var(--nb-green)}.nb-check.on .box{border-color:var(--nb-green)}.nb-check svg path{stroke:var(--nb-green);stroke-width:2.4;fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:22;stroke-dashoffset:22}.nb-check.on svg path{animation:nb-tick .28s ease forwards}@keyframes nb-tick{to{stroke-dashoffset:0}}.nb-link{border:0;background:none;padding:0;font-family:Spline Sans Mono,monospace;font-size:11px;color:var(--nb-blue);text-decoration:underline;text-underline-offset:3px}.nb-note{flex:1 1 180px;min-width:140px;padding:4px 8px;border:0;border-bottom:1.2px solid var(--nb-grid-strong);background:none;font-family:Caveat,cursive;font-size:18px;color:var(--nb-ink);outline:none}.nb-note:focus{border-bottom-color:var(--nb-blue)}.nb-note::placeholder{color:var(--nb-ink-soft);opacity:.6}.nb-modal{position:fixed;inset:0;z-index:60;display:grid;place-items:center;padding:20px;background:#1d2430b8}.nb-modal img{max-width:100%;max-height:88vh;border:3px solid var(--nb-paper);box-shadow:0 10px 40px #0006}.nb-modal button{position:absolute;top:16px;right:20px;border:0;background:var(--nb-paper);border-radius:3px;padding:6px 12px;font-family:Spline Sans Mono,monospace;font-size:12px}.nb .title-ru,.nb .nb-ex .ru,.nb .nb-pitfall .ru,.nb .nb-contrast .rule .ru{display:none}.nb.ru-on .title-ru,.nb.ru-on .nb-ex .ru,.nb.ru-on .nb-pitfall .ru,.nb.ru-on .nb-contrast .rule .ru,.nb .nb-card.ru .title-ru,.nb .nb-card.ru .nb-ex .ru,.nb .nb-card.ru .nb-pitfall .ru,.nb .nb-card.ru .nb-contrast .rule .ru{display:block}.nb-pitfall .en,.nb.ru-on .nb-pitfall .ru,.nb .nb-card.ru .nb-pitfall .ru{display:inline}.nb.ru-on .nb-pitfall .en,.nb .nb-card.ru .nb-pitfall .en{display:none}@media print{.ri-top,.ri-mobnav,.nb-bar,.nb-toc,.nb-foot,.nb-link,.nb-modal{display:none!important}body,body:has(.ri-dark){background:#fff}.dir-riso{background:#fff!important;background-image:none!important}.ri-body{padding:0!important}.nb{display:block;--nb-dim: 100%}.nb-sheet{background:#fff;background-image:none;border:0;box-shadow:none;padding:0}.nb-sheet:before{display:none}.nb-lesson{break-after:page;margin-bottom:0}.nb-lesson:last-child{break-after:auto}.nb-lesson-head .idx{margin-left:0}.nb-card{break-inside:avoid;animation:none;opacity:1!important}.nb-card h4{background:none;text-decoration:underline}.nb-table th{background:#eee}@page{size:A4;margin:16mm 14mm}}*{box-sizing:border-box}html,body{margin:0;min-height:100%;overflow-x:hidden;width:100%;max-width:100%}body{-webkit-font-smoothing:antialiased;background:#f3ecdd}body:has(.ri-dark){background:#14120c}button{cursor:pointer}button,input{font-family:inherit}input{cursor:text}#root{display:flex;flex-direction:column;min-height:100vh;overflow-x:clip;max-width:100%}.dir-riso{--paper: #f3ecdd;--paper2: #ece2cd;--ink: #181410;--blue: #2b3bd4;--coral: #ff5a3c;--yellow: #ffce2e;--mint: #15bd96;--shadow: 5px 5px 0 var(--ink);--shadow-sm: 3px 3px 0 var(--ink);flex:1;display:flex;flex-direction:column;font-family:Space Grotesk,system-ui,sans-serif;color:var(--ink);background-color:var(--paper);background-image:radial-gradient(rgba(24,20,16,.07) 1.1px,transparent 1.2px);background-size:9px 9px}.dir-riso *::selection{background:var(--yellow)}.ri-mono{font-family:Spline Sans Mono,monospace}.ri-card{background:var(--paper);border:2.5px solid var(--ink);border-radius:4px;box-shadow:var(--shadow)}.ri-tag{display:inline-flex;align-items:center;gap:6px;font-family:Spline Sans Mono,monospace;font-size:11px;font-weight:600;letter-spacing:1px;text-transform:uppercase;padding:4px 9px;border:2px solid var(--ink);border-radius:3px;background:var(--paper)}.ri-top{display:flex;align-items:center;gap:16px;flex-wrap:wrap;padding:16px 26px;border-bottom:2.5px solid var(--ink);background:var(--paper);position:sticky;top:0;z-index:50}.ri-logo{display:flex;align-items:center;gap:11px;margin-right:auto}.ri-logo-mark{width:44px;height:44px;display:grid;place-items:center;flex:0 0 auto;background:var(--coral);border:2.5px solid var(--ink);border-radius:5px;box-shadow:var(--shadow-sm);color:var(--paper);transform:rotate(-4deg)}.ri-logo b{display:block;font-size:16px;font-weight:700;letter-spacing:-.5px;line-height:1.1}.ri-logo span{display:block;font-family:Spline Sans Mono,monospace;font-size:10px;letter-spacing:1px;text-transform:uppercase;opacity:.7}.ri-tabs{display:flex;gap:6px;flex-wrap:wrap}.ri-tabs button{padding:8px 13px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper);font-family:inherit;font-size:13px;font-weight:600;color:var(--ink);transition:transform .1s,box-shadow .1s,background .1s}.ri-tabs button:hover{transform:translate(-1px,-1px);box-shadow:var(--shadow-sm)}.ri-tabs button.on{background:var(--blue);color:var(--paper);box-shadow:var(--shadow-sm)}.ri-badge{display:inline-flex;align-items:center;justify-content:center;margin-left:6px;padding:0 5px;min-width:18px;height:16px;border-radius:99px;background:var(--coral);color:var(--paper);font-size:10px;font-weight:700}.ri-theme-toggle{display:inline-flex;align-items:center;gap:7px;padding:8px 13px;flex:0 0 auto;border:2.5px solid var(--ink);border-radius:99px;background:var(--paper);font-family:Spline Sans Mono,monospace;font-size:11px;font-weight:600;letter-spacing:.5px;text-transform:uppercase;color:var(--ink);box-shadow:var(--shadow-sm);transition:transform .1s,box-shadow .1s}.ri-theme-toggle:hover{transform:translate(-1px,-1px);box-shadow:var(--shadow)}.ri-theme-toggle:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}.ri-theme-toggle svg{display:block}.ri-top-actions{display:flex;gap:8px;flex-wrap:wrap}.ri-sfx-toggle.off{opacity:.66}.auth-card{max-width:420px;margin:8vh auto 0;padding:26px;display:grid;gap:14px}.settings-panel{padding:24px;display:grid;gap:16px}.settings-row{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:14px 0;border-top:2px solid rgba(24,20,16,.18)}.settings-row:first-of-type{border-top:0}.settings-row b,.admin-field span{display:block;font-weight:700}.settings-row span,.admin-field span{font-family:Spline Sans Mono,monospace;font-size:11px;text-transform:uppercase;opacity:.65}.volume-row input[type=range]{width:min(320px,45vw);accent-color:var(--blue)}.admin-panel{display:grid;gap:16px}.admin-create{display:grid;grid-template-columns:minmax(160px,1fr) minmax(160px,1fr) auto;gap:14px;align-items:end;padding:18px}.admin-field .ri-input{margin-top:6px}.admin-users{display:grid;gap:12px}.admin-user{padding:16px;display:grid;gap:12px}.admin-user-main,.admin-user-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.admin-user-main .ri-input{max-width:320px;margin-top:0}.admin-user-actions .ri-input{max-width:220px;margin-top:0;font-size:15px;padding:10px 12px}.ri-btn:disabled,.ri-theme-toggle:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:var(--shadow-sm)}.ri-body{flex:1;padding:28px 26px 60px;max-width:1120px;width:100%;margin:0 auto}.ri-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper);font-family:inherit;font-size:15px;font-weight:700;color:var(--ink);box-shadow:var(--shadow-sm);transition:transform .1s,box-shadow .1s}.ri-btn:hover{transform:translate(-1px,-1px);box-shadow:5px 5px 0 var(--ink)}.ri-btn:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}.ri-btn.blue{background:var(--blue);color:var(--paper)}.ri-btn.coral{background:var(--coral);color:var(--paper)}.ri-btn.sm{padding:8px 13px;font-size:13px}.ri-error{margin-bottom:18px;padding:14px 18px;border:2.5px solid var(--coral);border-radius:4px;font-weight:600;color:var(--coral)}.ri-dash{display:grid;grid-template-columns:1.3fr 1fr;gap:18px;align-items:start}.ri-score{padding:26px;position:relative;overflow:hidden}.ri-score-big{display:flex;align-items:flex-end;gap:16px}.ri-score-big .n{font-size:96px;font-weight:700;line-height:.8;letter-spacing:-4px}.ri-score-big .of{font-family:Spline Sans Mono,monospace;font-size:15px;padding-bottom:10px;opacity:.7}.ri-progress{height:18px;margin-top:18px;border:2.5px solid var(--ink);border-radius:99px;background:var(--paper2);overflow:hidden}.ri-progress i{display:block;height:100%;background:var(--mint);background-image:repeating-linear-gradient(45deg,transparent 0 6px,rgba(0,0,0,.12) 6px 12px);transition:width .6s ease}.ri-stamp{position:absolute;top:18px;right:18px;transform:rotate(8deg);display:grid;place-items:center;text-align:center;gap:2px;width:92px;height:92px;border-radius:50%;border:3px dashed var(--coral);color:var(--coral)}.ri-stamp b{font-size:30px;font-weight:700;line-height:1}.ri-stamp span{font-family:Spline Sans Mono,monospace;font-size:9px;letter-spacing:1px;text-transform:uppercase}.ri-stats{display:grid;grid-template-columns:1fr 1fr;gap:14px}.ri-stat{padding:16px}.ri-stat span{font-family:Spline Sans Mono,monospace;font-size:11px;letter-spacing:.5px;text-transform:uppercase;opacity:.7}.ri-stat b{display:block;margin-top:6px;font-size:38px;font-weight:700;letter-spacing:-1.5px;line-height:1}.ri-stat.c1{background:var(--yellow)}.ri-stat.c2{background:var(--mint);color:var(--paper)}.ri-themes{grid-column:1 / -1}.ri-sec-title{display:flex;align-items:center;gap:12px;margin:8px 0 16px}.ri-sec-title h2{margin:0;font-size:22px;font-weight:700;letter-spacing:-.5px;white-space:nowrap}.ri-sec-title .rule{flex:1;height:2.5px;background:var(--ink)}.ri-theme-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}.ri-theme{padding:18px;position:relative;cursor:default;transition:transform .12s,box-shadow .12s}.ri-theme:nth-child(2n){transform:rotate(-.6deg)}.ri-theme:nth-child(3n){transform:rotate(.7deg)}.ri-theme:hover{transform:rotate(0) translate(-2px,-2px)!important;box-shadow:8px 8px 0 var(--ink)}.ri-theme .lvl{position:absolute;top:-10px;right:14px;background:var(--yellow)}.ri-theme h3{margin:6px 0 4px;font-size:17px;font-weight:700;letter-spacing:-.4px}.ri-theme p{margin:0 0 14px;font-size:13px;line-height:1.4;opacity:.8}.ri-theme .acts{display:flex;gap:8px;flex-wrap:wrap}.ri-dots{display:flex;gap:4px;margin-bottom:10px}.ri-dots i{width:11px;height:11px;border-radius:50%;border:2px solid var(--ink)}.ri-dots i.on{background:var(--mint)}.ri-train-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:18px}.ri-picker{display:flex;align-items:center;gap:8px}.ri-picker select{padding:9px 12px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper);font-family:inherit;font-weight:700;font-size:14px;box-shadow:var(--shadow-sm);color:var(--ink)}.ri-modes{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}.ri-modes button{padding:7px 13px;border:2.5px solid var(--ink);border-radius:99px;background:var(--paper);font-family:Spline Sans Mono,monospace;font-size:12px;font-weight:600;letter-spacing:.3px;color:var(--ink)}.ri-modes button.on{background:var(--ink);color:var(--paper)}.ri-stage{position:relative;padding:30px;background:var(--paper2);border:2.5px solid var(--ink);border-radius:4px;box-shadow:var(--shadow)}.ri-stage:before,.ri-stage:after{content:"";position:absolute;width:100%;height:100%;top:8px;left:8px;z-index:-1;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper)}.ri-stage:after{top:15px;left:15px;z-index:-2;opacity:.5}.ri-q-tag{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.ri-prompt{font-size:clamp(22px,3vw,30px);font-weight:700;letter-spacing:-.7px;line-height:1.2;overflow-wrap:anywhere}.ri-input{width:100%;margin-top:18px;padding:14px 16px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper);font-family:inherit;font-size:18px;font-weight:600;color:var(--ink);outline:none;box-shadow:inset 2px 2px #18141014}.ri-input:focus{background:#fffdf6}.ri-opts{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}.ri-opts button{padding:15px 16px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper);font-family:inherit;font-size:16px;font-weight:600;color:var(--ink);text-align:left;box-shadow:var(--shadow-sm);transition:transform .1s,box-shadow .1s,background .1s}.ri-opts button:hover{transform:translate(-1px,-1px)}.ri-opts button.sel{background:var(--blue);color:var(--paper)}.ri-builder{margin-top:18px}.ri-tray{display:flex;flex-wrap:wrap;gap:10px;min-height:64px;padding:14px;border:2.5px dashed var(--ink);border-radius:4px;align-items:flex-start;background:var(--paper)}.ri-tray .ph{font-family:Spline Sans Mono,monospace;font-size:13px;opacity:.6;align-self:center}.ri-word{padding:9px 15px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper);font-family:inherit;font-size:16px;font-weight:700;color:var(--ink);box-shadow:var(--shadow-sm);transition:transform .08s}.ri-word:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}.ri-word.pick{background:var(--yellow)}.ri-bank{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}.ri-flash{padding:18px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper);font-weight:600;margin-top:18px}.ri-fb{display:flex;gap:12px;margin-top:18px;padding:16px;border:2.5px solid var(--ink);border-radius:4px}.ri-fb.ok{background:var(--mint);color:var(--paper)}.ri-fb.no{background:var(--coral);color:var(--paper)}.ri-fb b{display:block;font-size:18px;font-weight:700}.ri-fb .ans{display:inline-flex;gap:8px;align-items:center;margin-top:4px;font-weight:700}.ri-fb p{margin:6px 0 0;font-size:14px;opacity:.95}.ri-actions{display:flex;gap:12px;margin-top:20px;align-items:center;flex-wrap:wrap}.ri-hint{font-family:Spline Sans Mono,monospace;font-size:11px;opacity:.6}.ri-blocks{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.ri-block{padding:22px;position:relative}.ri-block:nth-child(2n){transform:rotate(-.5deg)}.ri-block.wide{grid-column:1 / -1;transform:none}.ri-block h3{margin:0 0 16px;font-size:19px;font-weight:700;display:inline-block;background:var(--yellow);padding:2px 8px;box-shadow:2px 2px 0 var(--ink);color:var(--ink)}.ri-formula{display:grid;gap:10px}.ri-formula-row{display:grid;grid-template-columns:auto 1fr;gap:4px 14px;padding:12px 14px;border:2px solid var(--ink);border-radius:4px;background:var(--paper)}.ri-formula-row .pat{grid-row:span 2;align-self:center;font-family:Spline Sans Mono,monospace;font-weight:700;font-size:16px;color:var(--blue);padding-right:14px;border-right:2px solid var(--ink)}.ri-formula-row .mean{font-size:13px;opacity:.75}.ri-formula-row .ex{font-weight:600}.ri-list{margin:0;padding-left:22px}.ri-list li{margin:10px 0;line-height:1.45;font-size:15px}.ri-list li::marker{color:var(--coral);font-weight:700}.ri-dia{display:grid;gap:10px}.ri-dia-line{padding:14px;border:2px solid var(--ink);border-radius:4px;background:var(--paper);display:grid;gap:8px}.ri-dia-line span{display:flex;gap:10px;align-items:baseline}.ri-dia-line .who{font-family:Spline Sans Mono,monospace;font-weight:700;color:var(--paper);background:var(--ink);width:22px;height:22px;display:grid;place-items:center;border-radius:3px;flex:0 0 auto;font-size:12px}.ri-groups{display:grid;gap:10px}.ri-group{padding:12px 14px;border:2px solid var(--ink);border-radius:4px;background:var(--paper)}.ri-group b{display:block;font-size:14px;font-weight:700;margin-bottom:4px}.ri-group span{font-size:14px;opacity:.8}.ri-search{display:flex;align-items:center;gap:10px;margin-bottom:18px;padding:0 16px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper);box-shadow:var(--shadow-sm)}.ri-search input{flex:1;padding:13px 0;border:0;background:transparent;font-family:inherit;font-size:16px;font-weight:600;color:var(--ink);outline:none}.ri-phrase-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}.ri-flip{perspective:1000px;min-height:160px;width:100%;cursor:pointer;display:block}.ri-flip-in{position:relative;width:100%;min-height:160px;transition:transform .5s cubic-bezier(.4,0,.2,1);transform-style:preserve-3d}.ri-flip.flipped .ri-flip-in{transform:rotateY(180deg)}.ri-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;padding:18px;display:flex;flex-direction:column;border:2.5px solid var(--ink);border-radius:4px;box-shadow:var(--shadow)}.ri-face.front{background:var(--paper)}.ri-face.back{transform:rotateY(180deg);background:var(--blue);color:var(--paper)}.ri-face .cat{align-self:flex-start}.ri-face .en{margin-top:auto;font-size:19px;font-weight:700;letter-spacing:-.4px}.ri-face .ru{margin-top:auto;font-size:19px;font-weight:700}.ri-face .hintf{margin-top:8px;font-family:Spline Sans Mono,monospace;font-size:11px;opacity:.7}.ri-face .ex{margin-top:8px;font-size:13px;opacity:.9;font-style:italic}.ri-face-top{display:flex;justify-content:space-between;align-items:flex-start}.ri-status{display:inline-block;padding:2px 8px;border:2px solid var(--ink);border-radius:3px;font-family:Spline Sans Mono,monospace;font-size:10px;font-weight:600;text-transform:uppercase}.ri-status.mastered{background:var(--mint);color:var(--paper)}.ri-status.weak{background:var(--coral);color:var(--paper)}.ri-status.learning{background:var(--yellow)}.ri-status.new{background:var(--paper)}.ri-speak{width:34px;height:34px;display:grid;place-items:center;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper);cursor:pointer;flex:0 0 auto;box-shadow:var(--shadow-sm);color:var(--ink)}.ri-speak:hover{transform:translate(-1px,-1px)}.ri-empty{padding:30px;text-align:center;font-family:Spline Sans Mono,monospace;font-size:13px;border:2.5px dashed var(--ink);border-radius:4px;opacity:.7}.ri-mistake-list{display:grid;gap:12px}.ri-mistake-item{display:flex;gap:16px;justify-content:space-between;align-items:flex-start;padding:16px 18px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper);box-shadow:var(--shadow-sm)}.ri-mistake-item .en{font-size:17px;font-weight:700;letter-spacing:-.4px}.ri-mistake-item .ru{margin-top:4px;font-size:14px;opacity:.75}.ri-mistake-item .lesson{margin-top:4px;font-family:Spline Sans Mono,monospace;font-size:11px;opacity:.55;text-transform:uppercase;letter-spacing:.5px}.ri-mistake-actions{display:flex;gap:8px;flex:0 0 auto;align-items:center;flex-wrap:wrap}.ri-mobnav{display:none;gap:4px;padding:8px;border-top:2.5px solid var(--ink);background:var(--paper)}.ri-mobnav button{flex:1;display:grid;place-items:center;gap:2px;padding:8px 4px;border:0;border-radius:4px;background:transparent;font-family:Spline Sans Mono,monospace;font-size:9px;font-weight:600;text-transform:uppercase;color:var(--ink)}.ri-mobnav button.on{background:var(--blue);color:var(--paper)}.ri-dark{--paper: #14120c;--paper2: #1e1a11;--ink: #f0e7d2;--blue: #6a78ff;--coral: #ff6a4d;--yellow: #ffd24a;--mint: #2ad4a6;--shadow: 5px 5px 0 var(--ink);--shadow-sm: 3px 3px 0 var(--ink);background-color:var(--paper);background-image:radial-gradient(rgba(240,231,210,.07) 1.1px,transparent 1.2px)}.ri-dark .ri-card{background:var(--paper2)}.ri-dark .ri-top,.ri-dark .ri-tabs button,.ri-dark .ri-modes button,.ri-dark .ri-stage,.ri-dark .ri-stage:before,.ri-dark .ri-input,.ri-dark .ri-opts button,.ri-dark .ri-word,.ri-dark .ri-tray,.ri-dark .ri-flash,.ri-dark .ri-formula-row,.ri-dark .ri-group,.ri-dark .ri-dia-line,.ri-dark .ri-search,.ri-dark .ri-speak,.ri-dark .ri-picker select,.ri-dark .ri-mobnav,.ri-dark .ri-face.front,.ri-dark .ri-mistake-item{background:var(--paper2)}.ri-dark .ri-stage{background:#100e09}.ri-dark .ri-tabs button,.ri-dark .ri-opts button{background:var(--paper2);color:var(--ink)}.ri-dark .ri-stat.c1{background:var(--yellow)}.ri-dark .ri-stat.c2{background:var(--mint)}.ri-dark .ri-opts button.sel,.ri-dark .ri-tabs button.on,.ri-dark .ri-mobnav button.on{background:#3b49d6!important;color:#f6efdd!important}.ri-dark .ri-btn.blue,.ri-dark .ri-face.back{background:#3b49d6;color:#f6efdd}.ri-dark .ri-stat.c1,.ri-dark .ri-stat.c2,.ri-dark .ri-word.pick,.ri-dark .ri-status.learning,.ri-dark .ri-status.mastered,.ri-dark .ri-block h3,.ri-dark .ri-fb.ok,.ri-dark .lvl{color:#14120c}.ri-dark .ri-input:focus{background:#100e09}.ri-dark .ri-theme-toggle{background:var(--paper2)}.ri-dark .ri-mobnav{box-shadow:0 -3px #0006}.ri-dark .settings-row{border-top-color:#f0e7d233}.iv-legend{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}.iv-chip{padding:3px 10px;border:2px solid;border-radius:99px;font-family:Spline Sans Mono,monospace;font-size:11px;font-weight:600}.iv-table{display:grid;gap:6px;min-width:0}.iv-thead{display:grid;grid-template-columns:36px 1.2fr 1fr 1fr 1.4fr 36px;gap:10px;padding:8px 14px;font-family:Spline Sans Mono,monospace;font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;opacity:.55}.iv-row{display:grid;grid-template-columns:36px 1.2fr 1fr 1fr 1.4fr 36px;gap:10px;align-items:center;padding:10px 14px;border-left:3px solid;border-radius:4px;border-right:2.5px solid var(--ink);border-top:2.5px solid var(--ink);border-bottom:2.5px solid var(--ink);transition:box-shadow .1s}.iv-row:hover{box-shadow:3px 3px 0 var(--ink)}.iv-n{font-family:Spline Sans Mono,monospace;font-size:11px;opacity:.5}.iv-base{font-size:16px;font-weight:700;letter-spacing:-.3px}.iv-form,.iv-base,.iv-ru{min-width:0;overflow-wrap:anywhere}.iv-ru{font-size:13px;opacity:.75}.iv-cell-speak{justify-self:end}.iv-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 18px}.iv-tabs button{padding:9px 14px;border:2.5px solid var(--ink);border-radius:99px;background:var(--paper);color:var(--ink);font-family:inherit;font-weight:700}.iv-tabs button.on{background:var(--blue);color:var(--paper);box-shadow:var(--shadow-sm)}.iv-course-shell{display:grid;gap:18px}.iv-course-status{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.iv-course-status>div{min-width:0;padding:13px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper2);box-shadow:var(--shadow-sm)}.iv-course-status span{display:block;font-family:Spline Sans Mono,monospace;font-size:10px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;opacity:.7}.iv-course-status b{display:block;margin-top:5px;overflow-wrap:anywhere;font-size:16px}.iv-course-card{max-width:760px;padding:26px}.iv-course-card h3{margin:14px 0 8px;font-size:clamp(23px,3vw,31px);letter-spacing:-.8px}.iv-course-card p{margin:0 0 16px;line-height:1.55}.iv-course-rules{display:grid;gap:8px;margin:18px 0 24px;padding-left:22px}.iv-course-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:24px}.iv-course-head .ri-mono{font-size:12px;font-weight:700}.iv-course-prompt{max-width:660px;font-size:clamp(25px,4vw,36px);font-weight:700;letter-spacing:-1px;line-height:1.15}.iv-course-translation{margin-top:10px!important;font-size:17px;font-weight:600;opacity:.7}.iv-course-fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px;margin-top:24px}.iv-course-fields label{display:grid;gap:6px}.iv-course-fields label span{font-family:Spline Sans Mono,monospace;font-size:11px;font-weight:700;letter-spacing:.4px;text-transform:uppercase}.iv-course-fields input{width:100%;min-width:0;padding:12px 14px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper);color:var(--ink);font:inherit;font-size:18px;font-weight:700}.iv-course-fields input.ok{border-color:var(--mint);background:#15bd961f}.iv-course-fields input.no{border-color:var(--coral);background:#ff5a3c1c}.iv-course-feedback{display:grid;gap:4px;margin-top:18px;padding:13px 15px;border:2.5px solid var(--ink);border-radius:4px}.iv-course-feedback.ok{background:#15bd9626;border-color:var(--mint)}.iv-course-feedback.no{background:#ff5a3c1f;border-color:var(--coral)}.iv-course-feedback span{font-family:Spline Sans Mono,monospace;font-size:12px;line-height:1.45}.iv-course-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.iv-course-finished{background:var(--mint)}.match-setup{max-width:640px;padding:28px}.match-desc{margin:0 0 18px;font-size:15px;line-height:1.5;opacity:.8}.match-field-label{margin:14px 0 8px;font-family:Spline Sans Mono,monospace;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;opacity:.6}.match-reward{margin:10px 0 0;font-family:Spline Sans Mono,monospace;font-size:12px;opacity:.65}.match-chips{display:flex;flex-wrap:wrap;gap:10px}.match-chip{flex:1 1 120px;display:flex;flex-direction:column;gap:2px;padding:12px 14px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper);font-family:inherit;color:var(--ink);text-align:left;box-shadow:var(--shadow-sm);transition:transform .1s,box-shadow .1s,background .1s}.match-chip:hover{transform:translate(-1px,-1px);box-shadow:5px 5px 0 var(--ink)}.match-chip.on{background:var(--blue);color:var(--paper)}.match-chip b{font-size:15px;font-weight:700}.match-chip span{font-size:12px;opacity:.85}.match-chip em{font-family:Spline Sans Mono,monospace;font-size:10px;font-style:normal;opacity:.7}.match-chip.dir{flex:1 1 160px}.match-header{display:flex;align-items:center;gap:10px;margin-bottom:18px;padding:10px 14px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper);box-shadow:var(--shadow-sm);flex-wrap:wrap}.match-timer-bar{height:10px;min-width:80px;border:2px solid var(--ink);border-radius:99px;overflow:hidden;background:var(--paper2)}.match-timer-fill{height:100%;border-radius:99px;transition:width 1s linear,background .3s}.match-pill{padding:4px 10px;border:2px solid var(--ink);border-radius:99px;background:var(--paper);font-family:Spline Sans Mono,monospace;font-size:12px;font-weight:700;white-space:nowrap}.match-pill.streak{opacity:.7}.match-pill.streak.hot{background:var(--yellow);opacity:1}.match-arena{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}.match-col{display:flex;flex-direction:column;gap:10px}.match-tile{width:100%;padding:14px 16px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper);font-family:inherit;font-size:15px;font-weight:600;color:var(--ink);text-align:center;box-shadow:var(--shadow-sm);transition:transform .1s,box-shadow .1s,opacity .2s,background .12s;cursor:pointer;overflow-wrap:anywhere}.match-tile:hover:not(:disabled){transform:translate(-1px,-1px);box-shadow:4px 4px 0 var(--ink)}.match-tile.selected{background:var(--blue);color:var(--paper)}.match-tile.correct{background:var(--mint);color:var(--paper);animation:pop .2s ease}.match-tile.wrong{background:var(--coral);color:var(--paper);animation:shake .35s}.match-tile:disabled{cursor:default}.match-tile:disabled:not(.selected):not(.correct):not(.wrong){opacity:.55}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-6px)}75%{transform:translate(6px)}}@keyframes pop{0%{transform:scale(1)}50%{transform:scale(1.06)}to{transform:scale(1)}}.match-paused{display:grid;place-items:center;min-height:240px;border:2.5px dashed var(--ink);border-radius:4px;text-align:center}.match-paused h3{margin:0 0 14px;font-size:22px}.match-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:18px}.match-stat{padding:14px;border:2.5px solid var(--ink);border-radius:4px;background:var(--paper)}.match-stat span{font-family:Spline Sans Mono,monospace;font-size:10px;text-transform:uppercase;letter-spacing:.5px;opacity:.7}.match-stat b{display:block;margin-top:5px;font-size:26px;font-weight:700;letter-spacing:-1px;line-height:1}.match-stat.c1{background:var(--yellow)}.match-stat.c2{background:var(--mint);color:var(--paper)}.match-mistakes{margin:8px 0 4px;display:grid;gap:8px}.match-mistake-row{display:grid;grid-template-columns:1fr 1fr 36px;gap:10px;align-items:center;padding:10px 14px;border:2px solid var(--ink);border-radius:4px;background:var(--paper)}.match-mistake-row b{font-size:15px;font-weight:700}.match-mistake-row span{font-size:13px;opacity:.75}.match-result-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.ri-dark .match-stat.c1,.ri-dark .match-stat.c2,.ri-dark .match-pill.streak.hot,.ri-dark .match-chip.on{color:#14120c}.ri-dark .match-chip.on,.ri-dark .match-tile.selected{background:#3b49d6;color:#f6efdd}@media(max-width:900px){.ri-dash,.ri-blocks{grid-template-columns:1fr}.ri-block:nth-child(2n){transform:none}}@media(max-width:720px){.ri-top{padding:12px 14px;gap:8px}.ri-tabs,.ri-logo span{display:none}.ri-top-actions{margin-left:auto}.ri-mobnav{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:60;flex-wrap:nowrap;gap:6px;padding:8px 10px;padding-bottom:calc(8px + env(safe-area-inset-bottom,0px));overflow-x:auto;overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch;scrollbar-width:none}.ri-mobnav::-webkit-scrollbar{display:none}.ri-mobnav button{flex:0 0 auto;min-width:60px;padding:7px 10px}.ri-mobnav .ri-badge{margin-left:5px}.ri-body{padding:18px 14px;padding-bottom:calc(76px + env(safe-area-inset-bottom,0px))}.ri-score-big .n{font-size:64px;letter-spacing:-3px}.ri-stat b{font-size:32px}.ri-opts,.ri-phrase-grid{grid-template-columns:1fr}.settings-row{align-items:flex-start;flex-direction:column}.volume-row input[type=range]{width:100%}.admin-create{grid-template-columns:1fr}.admin-user-main,.admin-user-actions{align-items:stretch;flex-direction:column}.admin-user-main .ri-input,.admin-user-actions .ri-input{max-width:none;width:100%}.match-arena{gap:10px}.match-tile{padding:12px 10px;font-size:14px}.match-header{gap:8px;padding:8px 10px}.iv-thead{display:none}.iv-row{grid-template-columns:auto minmax(0,1fr) auto;grid-template-areas:"n base speak" "past participle speak" "ru ru ru";gap:8px 12px;padding:12px;align-items:start}.iv-cell-n{grid-area:n;padding-top:2px}.iv-cell-base{grid-area:base}.iv-cell-past{grid-area:past}.iv-cell-participle{grid-area:participle}.iv-cell-ru{grid-area:ru;margin-top:2px}.iv-cell-speak{grid-area:speak;align-self:start}.iv-cell-past:before,.iv-cell-participle:before{display:block;margin-bottom:2px;font-family:Spline Sans Mono,monospace;font-size:9px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;opacity:.6}.iv-cell-past:before{content:"Past Simple"}.iv-cell-participle:before{content:"Past Participle"}.iv-form{font-size:14px}.iv-course-status{grid-template-columns:repeat(2,minmax(0,1fr))}.iv-course-card{padding:20px}.iv-course-prompt{font-size:26px}@media(max-width:380px){.ri-mobnav button{min-width:56px;font-size:8.5px}.ri-score-big .n{font-size:56px}}}