:root{--bg:#fdfbf7;--card:#fff;--ink:#2e3a59;--pastel-sky:#bee3f2;--pastel-pistachio:#c8e6c0;--pastel-lemon:#fdf6c3;--pastel-blossom:#f6cfe0;--pastel-lilac:#d8ccf0;--pastel-mint:#c3eee3;--sky:var(--pastel-sky);--pistachio:var(--pastel-pistachio);--lemon:var(--pastel-lemon);--blossom:var(--pastel-blossom);--lilac:var(--pastel-lilac);--mint:var(--pastel-mint);--line:var(--ink);--focus:var(--ink);--sky-edge:var(--line);--pistachio-edge:var(--line);--lemon-edge:var(--line);--blossom-edge:var(--line);--lilac-edge:var(--line);--mint-edge:var(--line);--scheme:light;--night-bg:#101522;--night-card:#171d2b;--night-ink:#f7f4ee;--night-line:#bbc7e6;--night-sky:#132936;--night-pistachio:#17291e;--night-lemon:#202433;--night-blossom:#2c1d27;--night-lilac:#251f33;--night-mint:#142b29;--night-focus:var(--pastel-lemon);--radius:18px;--tap:60px}:root[data-theme=dark]{--bg:var(--night-bg);--card:var(--night-card);--ink:var(--night-ink);--sky:var(--night-sky);--pistachio:var(--night-pistachio);--lemon:var(--night-lemon);--blossom:var(--night-blossom);--lilac:var(--night-lilac);--mint:var(--night-mint);--line:var(--night-line);--focus:var(--night-focus);--sky-edge:var(--pastel-sky);--pistachio-edge:var(--pastel-pistachio);--lemon-edge:var(--pastel-lemon);--blossom-edge:var(--pastel-blossom);--lilac-edge:var(--pastel-lilac);--mint-edge:var(--pastel-mint);--scheme:dark}@media 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var(--line);border-radius:var(--radius);margin-bottom:12px;padding:16px}.card.sky{background:var(--sky);border-color:var(--sky-edge)}.card.pistachio{background:var(--pistachio);border-color:var(--pistachio-edge)}.card.lemon{background:var(--lemon);border-color:var(--lemon-edge)}.card.blossom{background:var(--blossom);border-color:var(--blossom-edge)}.card.lilac{background:var(--lilac);border-color:var(--lilac-edge)}.card.mint{background:var(--mint);border-color:var(--mint-edge)}.card.sky>:first-child{color:var(--sky-edge)}.card.pistachio>:first-child{color:var(--pistachio-edge)}.card.lemon>:first-child{color:var(--lemon-edge)}.card.blossom>:first-child{color:var(--blossom-edge)}.card.lilac>:first-child{color:var(--lilac-edge)}.card.mint>:first-child{color:var(--mint-edge)}.btn{width:100%;min-height:var(--tap);background:var(--card);border:2.5px solid var(--line);text-align:center;color:var(--ink);border-radius:16px;margin-bottom:10px;padding:14px 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.chip{overflow-wrap:anywhere;min-width:0;margin-right:4px}.builder-topic-remove{width:var(--tap);min-width:var(--tap);justify-content:center;align-items:center;margin-right:8px;padding:10px;display:inline-flex}.builder-clear-topics{margin-top:8px}.builder-next{margin-top:14px;margin-bottom:0}.builder-checking{margin:0}.meter{gap:5px;margin-top:8px;display:flex}.meter span{border:1.5px solid var(--line);background:var(--card);border-radius:999px;flex:1;height:14px;transition:background-color .2s ease-out,border-color .2s ease-out}.meter span.on{background:var(--ink);border-color:var(--ink)}.tabbar{z-index:5;background:var(--bg);border-top:2.5px solid var(--line);padding:6px 0 calc(6px + env(safe-area-inset-bottom));justify-content:space-around;display:flex;position:fixed;bottom:0;left:0;right:0}.tabbar a{min-height:var(--tap);text-align:center;color:var(--ink);flex:1;padding-top:4px;font-size:15px;text-decoration:none}.tabbar a.on{font-weight:600}.tabbar 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span,.btn.reveal-answer:disabled{transition:none}.btn:active{transform:none}.btn,.chip,.src,.tabbar a,input,textarea,select,button{transition:none}}@media (width>=900px) and (pointer:fine){.shell{grid-template-columns:210px 1fr;min-height:100vh;display:grid}.app{padding-bottom:32px}.tabbar{border-top:none;border-right:2.5px solid var(--line);flex-direction:column;justify-content:flex-start;align-self:start;gap:6px;height:100vh;padding:20px 12px;position:sticky;top:0}.tabbar a{text-align:left;border-radius:16px;flex:none;padding:12px;font-size:16px}.tabbar a.on{background:var(--sky);border:2.5px solid var(--line)}.tabbar .glyph{margin-right:8px;font-size:20px;display:inline-block}.two{grid-template-columns:1fr 1fr;align-items:start;gap:20px;display:grid}}