@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:400;src:url(../media/ibm-plex-sans-cyrillic-ext-400-normal.0sqs6uof-0amz.woff2)format("woff2"),url(../media/ibm-plex-sans-cyrillic-ext-400-normal.1n25945oofmoi.woff)format("woff");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:400;src:url(../media/ibm-plex-sans-cyrillic-400-normal.1nbavbgzpe520.woff2)format("woff2"),url(../media/ibm-plex-sans-cyrillic-400-normal.13meln3u2wrw1.woff)format("woff");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:400;src:url(../media/ibm-plex-sans-greek-400-normal.13urx6ctg50nq.woff2)format("woff2"),url(../media/ibm-plex-sans-greek-400-normal.3jezoma1zzezb.woff)format("woff");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:400;src:url(../media/ibm-plex-sans-vietnamese-400-normal.0ai7gdju0gby9.woff2)format("woff2"),url(../media/ibm-plex-sans-vietnamese-400-normal.2u9cx6ke8pzx4.woff)format("woff");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:400;src:url(../media/ibm-plex-sans-latin-ext-400-normal.0ceeqphcbp8x9.woff2)format("woff2"),url(../media/ibm-plex-sans-latin-ext-400-normal.0rj0k8-86v7v_.woff)format("woff");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:400;src:url(../media/ibm-plex-sans-latin-400-normal.1-h52z97c7bce.woff2)format("woff2"),url(../media/ibm-plex-sans-latin-400-normal.0fuh4fyjfo9ap.woff)format("woff");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:600;src:url(../media/ibm-plex-sans-cyrillic-ext-600-normal.16h6o2_j8rsce.woff2)format("woff2"),url(../media/ibm-plex-sans-cyrillic-ext-600-normal.3juwc1-_leybj.woff)format("woff");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:600;src:url(../media/ibm-plex-sans-cyrillic-600-normal.2tlxqadn_cmsz.woff2)format("woff2"),url(../media/ibm-plex-sans-cyrillic-600-normal.3csci4y08h_ps.woff)format("woff");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:600;src:url(../media/ibm-plex-sans-greek-600-normal.0h_04yfamc884.woff2)format("woff2"),url(../media/ibm-plex-sans-greek-600-normal.1fh4va1m5wx0j.woff)format("woff");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:600;src:url(../media/ibm-plex-sans-vietnamese-600-normal.0f-wuky6h_rs9.woff2)format("woff2"),url(../media/ibm-plex-sans-vietnamese-600-normal.2_uiyrwt0npgh.woff)format("woff");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:600;src:url(../media/ibm-plex-sans-latin-ext-600-normal.1uvdyv9iryn4j.woff2)format("woff2"),url(../media/ibm-plex-sans-latin-ext-600-normal.01k4adpnb_n12.woff)format("woff");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:600;src:url(../media/ibm-plex-sans-latin-600-normal.11xxlm8n0_7w8.woff2)format("woff2"),url(../media/ibm-plex-sans-latin-600-normal.0o-mv26yr1hzk.woff)format("woff");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:700;src:url(../media/ibm-plex-sans-cyrillic-ext-700-normal.1-2v_jdxm4wkv.woff2)format("woff2"),url(../media/ibm-plex-sans-cyrillic-ext-700-normal.1jjrn34acicpm.woff)format("woff");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:700;src:url(../media/ibm-plex-sans-cyrillic-700-normal.1v0mehqul4wn3.woff2)format("woff2"),url(../media/ibm-plex-sans-cyrillic-700-normal.1uq7_uwtesvol.woff)format("woff");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:700;src:url(../media/ibm-plex-sans-greek-700-normal.2x0g8k4jve4nf.woff2)format("woff2"),url(../media/ibm-plex-sans-greek-700-normal.319r8xnmyusig.woff)format("woff");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:700;src:url(../media/ibm-plex-sans-vietnamese-700-normal.0jtd_q3vhj3x7.woff2)format("woff2"),url(../media/ibm-plex-sans-vietnamese-700-normal.0_oygjwvlh6o2.woff)format("woff");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:700;src:url(../media/ibm-plex-sans-latin-ext-700-normal.24tkxntfix5cw.woff2)format("woff2"),url(../media/ibm-plex-sans-latin-ext-700-normal.3ofvqs3ri2xx9.woff)format("woff");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:700;src:url(../media/ibm-plex-sans-latin-700-normal.0opy23tsy2xx8.woff2)format("woff2"),url(../media/ibm-plex-sans-latin-700-normal.22xfth4l63-nz.woff)format("woff");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:IBM Plex Mono;font-style:normal;font-display:swap;font-weight:400;src:url(../media/ibm-plex-mono-cyrillic-ext-400-normal.0_q8wa_t-7-c7.woff2)format("woff2"),url(../media/ibm-plex-mono-cyrillic-ext-400-normal.1-h66gx1kjeux.woff)format("woff");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:IBM Plex Mono;font-style:normal;font-display:swap;font-weight:400;src:url(../media/ibm-plex-mono-cyrillic-400-normal.2dcg25_89g34d.woff2)format("woff2"),url(../media/ibm-plex-mono-cyrillic-400-normal.1r3eey-1tdqwh.woff)format("woff");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:IBM Plex Mono;font-style:normal;font-display:swap;font-weight:400;src:url(../media/ibm-plex-mono-vietnamese-400-normal.40ek894ady0so.woff2)format("woff2"),url(../media/ibm-plex-mono-vietnamese-400-normal.0blsyrk14nago.woff)format("woff");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:IBM Plex Mono;font-style:normal;font-display:swap;font-weight:400;src:url(../media/ibm-plex-mono-latin-ext-400-normal.1ih4rrmj883u6.woff2)format("woff2"),url(../media/ibm-plex-mono-latin-ext-400-normal.0hj8bqnym411c.woff)format("woff");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:IBM Plex Mono;font-style:normal;font-display:swap;font-weight:400;src:url(../media/ibm-plex-mono-latin-400-normal.19gbeb610ur4n.woff2)format("woff2"),url(../media/ibm-plex-mono-latin-400-normal.3nj-glub930lh.woff)format("woff");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:IBM Plex Mono;font-style:normal;font-display:swap;font-weight:600;src:url(../media/ibm-plex-mono-cyrillic-ext-600-normal.359v33n-iztly.woff2)format("woff2"),url(../media/ibm-plex-mono-cyrillic-ext-600-normal.398wshiu4r_iu.woff)format("woff");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:IBM Plex Mono;font-style:normal;font-display:swap;font-weight:600;src:url(../media/ibm-plex-mono-cyrillic-600-normal.2ftnyia3t1pbj.woff2)format("woff2"),url(../media/ibm-plex-mono-cyrillic-600-normal.2yoett-16jbxc.woff)format("woff");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:IBM Plex Mono;font-style:normal;font-display:swap;font-weight:600;src:url(../media/ibm-plex-mono-vietnamese-600-normal.3ufj-gslhu4nz.woff2)format("woff2"),url(../media/ibm-plex-mono-vietnamese-600-normal.1nomdqs_fzu-5.woff)format("woff");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:IBM Plex Mono;font-style:normal;font-display:swap;font-weight:600;src:url(../media/ibm-plex-mono-latin-ext-600-normal.3r1dv7zl76cle.woff2)format("woff2"),url(../media/ibm-plex-mono-latin-ext-600-normal.0s7g4yy6qy35e.woff)format("woff");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:IBM Plex Mono;font-style:normal;font-display:swap;font-weight:600;src:url(../media/ibm-plex-mono-latin-600-normal.04jv21_rdbjv3.woff2)format("woff2"),url(../media/ibm-plex-mono-latin-600-normal.0tzh5malamm2z.woff)format("woff");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
:root{--ink:#15243b;--drip:#0e6f80;--drip-dark:#0b5968;--drip-light:#5cc4d6;--paper:#f4f6f9;--night:#0f1b2d;--body:#2d3a4f;--muted:#4a5568;--line:#d9dee7;--white:#fff;--ok-fg:#0e6f80;--ok-bg:#e6f3f5;--round-fg:#b45309;--round-bg:#fff1e0;--bad-fg:#b42318;--bad-bg:#fce8e6;--sans:"IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;--mono:"IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;--radius:10px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}*{box-sizing:border-box}html,body{background:var(--white);color:var(--body);font-family:var(--sans);-webkit-text-size-adjust:100%;margin:0;padding:0;font-size:15px;line-height:1.5}a{color:var(--drip)}a:hover{color:var(--drip-dark)}h1,h2,h3{color:var(--ink);margin:0;line-height:1.15}h1{font-size:28px;font-weight:700}h2{font-size:22px;font-weight:700}h3{font-size:17px;font-weight:600}.mono{font-family:var(--mono)}.eyebrow{font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--drip);font-size:13px;font-weight:600}.muted{color:var(--muted)}.small{font-size:13px}.unit{color:var(--muted);font-weight:400}.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;overflow:hidden;position:absolute!important}:focus-visible{outline:3px solid var(--drip-light);outline-offset:2px}.site-header{border-bottom:1px solid var(--line)}.site-header__inner{align-items:center;gap:24px;max-width:1120px;margin:0 auto;padding:12px 16px;display:flex}.brand{color:var(--ink);align-items:center;gap:10px;font-size:17px;font-weight:700;text-decoration:none;display:flex}.brand:hover{color:var(--ink)}.site-nav{gap:20px;display:flex}.site-nav a{color:var(--ink);font-weight:500;text-decoration:none}.site-nav a[aria-current=page]{color:var(--drip)}.site-header__right{align-items:center;gap:16px;margin-left:auto;display:flex}.free-counter{font-family:var(--mono);color:var(--muted);white-space:nowrap;text-align:right;min-width:10ch;font-size:13px}.site-main{max-width:1120px;margin:0 auto;padding:24px 16px 40px}.site-footer{border-top:1px solid var(--line);color:var(--muted);font-size:13px}.site-footer__inner{max-width:1120px;margin:0 auto;padding:16px}.btn{border-radius:var(--radius);border:1px solid var(--line);background:var(--white);min-height:44px;color:var(--ink);font:inherit;cursor:pointer;justify-content:center;align-items:center;gap:10px;padding:10px 18px;font-weight:600;text-decoration:none;display:inline-flex}.btn:hover{border-color:var(--ink);color:var(--ink)}.btn--primary{background:var(--ink);border-color:var(--ink);color:var(--white)}.btn--primary:hover{background:var(--night);color:var(--white)}.btn--block{width:100%}.btn[disabled]{opacity:.55;cursor:not-allowed}.kbd{font-family:var(--mono);opacity:.8;border:1px solid;border-radius:4px;padding:0 5px;font-size:12px}.link-button{font:inherit;color:var(--drip);cursor:pointer;background:0 0;border:0;padding:0;text-decoration:underline}.hub-head{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:24px;display:flex}.hub-head p{margin:8px 0 0}.pill{background:var(--paper);border-radius:var(--radius);font-family:var(--mono);color:var(--ink);padding:8px 14px;font-size:13px}.topic-group{margin:28px 0 0}.topic-group h2{margin-bottom:12px}.topic-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin:0;padding:0;list-style:none;display:grid}.topic-card{border:1px solid var(--line);border-radius:var(--radius);height:100%;color:var(--body);flex-direction:column;min-height:112px;padding:16px;text-decoration:none;display:flex}a.topic-card:hover{border-color:var(--ink);color:var(--body)}.topic-card--flagged{border:2px solid var(--round-fg)}.topic-card--coming{background:var(--paper);border-style:dashed}.topic-card__title{color:var(--ink);justify-content:space-between;gap:8px;font-weight:600;display:flex}.topic-card__flag{font-family:var(--mono);color:var(--round-fg);font-size:12px;font-weight:600}.topic-card__count{font-family:var(--mono);color:var(--muted);margin-top:2px;font-size:13px}.topic-card__status{margin-top:10px}.topic-card__score{align-items:baseline;gap:8px;display:flex}.topic-card__pct{font-family:var(--mono);color:var(--drip);font-size:22px;font-weight:600}.topic-card--flagged .topic-card__pct{color:var(--round-fg)}.hub-note{margin-top:28px}.crumbs{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 16px;margin-bottom:16px;font-size:13px;display:flex}.crumbs__trail{align-items:center;gap:10px;display:flex}.crumbs__trail a{color:var(--body);text-decoration:none}.crumbs__back{align-items:center;display:inline-flex}.crumbs__chevron{display:none}.method-line select{font:inherit;border:1px solid var(--line);border-radius:6px;padding:2px 4px;font-size:13px}.drill{grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:start;gap:24px;display:grid}.problem-panel{background:var(--paper);border-radius:12px;padding:20px 24px}.problem-grid{grid-template-columns:minmax(0,1fr);gap:12px 24px;display:grid}.problem-grid--patient{grid-template-columns:minmax(0,1.4fr) minmax(0,1fr)}.field-label{font-family:var(--mono);color:var(--muted);font-size:13px}.order-text{font-family:var(--mono);color:var(--ink);margin-top:2px;font-size:17px}.exhibits{gap:10px;margin-top:6px;display:grid}.exhibit svg{width:100%;height:auto;display:block}.question{color:var(--ink);margin:16px 0 0;font-size:17px}.hint-box{border:1px dashed var(--line);background:var(--white);border-radius:8px;margin-top:16px;padding:10px 14px}.hint-box__head{justify-content:space-between;gap:8px;font-size:13px;display:flex}.hint-box__head .eyebrow{text-transform:none;letter-spacing:.02em;font-size:12px}.hint-box__head .hinted{color:var(--round-fg)}.hint-box code{font-family:var(--mono);color:var(--ink);overflow-wrap:anywhere;margin-top:4px;font-size:15px;display:block}.answer-col{gap:12px;display:grid}.answer-box{border:2px solid var(--ink);background:var(--white);border-radius:12px;align-items:center;gap:12px;padding:10px 20px;display:flex}.answer-box input{width:100%;min-width:0;font-family:var(--mono);color:var(--ink);background:0 0;border:0;outline:0;flex:1;padding:4px 0;font-size:36px;font-weight:600}.answer-box input::placeholder{color:#9aa3b2;font-weight:400}.answer-box .unit{font-family:var(--mono);font-size:17px}.answer-box:focus-within{outline:3px solid var(--drip-light);outline-offset:2px}.answer-box--correct{border-color:var(--ok-fg);background:var(--ok-bg)}.answer-box--rounding{border-color:var(--round-fg);background:var(--round-bg)}.answer-box--wrong{border-color:var(--bad-fg);background:var(--bad-bg)}.input-hint{color:var(--bad-fg);font-size:13px;font-weight:600}.btn-row{grid-template-columns:1fr 1.4fr;gap:10px;display:grid}.legend{border-top:1px solid var(--line);color:var(--muted);gap:4px;padding-top:10px;font-size:13px;display:grid}.result{border:1px solid;border-radius:12px;padding:14px 16px}.result__head{align-items:center;gap:8px;font-weight:700;display:flex}.result p{margin:6px 0 0}.result--correct{color:var(--ok-fg);background:var(--ok-bg);border-color:#a9d4dc}.result--rounding{color:var(--round-fg);background:var(--round-bg);border-color:#f2c9a0}.result--wrong{color:var(--bad-fg);background:var(--bad-bg);border-color:#f0b8b2}.result__body{color:var(--body)}.result__fine{color:var(--muted);font-size:13px}.result__step{font-family:var(--mono);color:var(--ink);overflow-wrap:anywhere;margin-top:4px;display:block}.result__actions{flex-wrap:wrap;gap:10px;margin-top:12px;display:flex}.solution{border:1px solid var(--line);border-radius:14px;grid-column:1/-1;padding:20px 24px}.solution__head{justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:12px;display:flex}.solution__answer{color:var(--muted);font-size:13px}.solution__answer strong{font-family:var(--mono);color:var(--ink);margin:0 4px 0 8px;font-size:28px}.method{border:1px solid var(--line);border-radius:10px;margin-top:10px}.method[open]{border-color:#0000}.method summary{cursor:pointer;min-height:44px;font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink);border-radius:10px;justify-content:space-between;align-items:center;padding:12px 14px;font-size:13px;font-weight:600;list-style:none;display:flex}.method summary::-webkit-details-marker{display:none}.method[open] summary{background:var(--paper);color:var(--drip)}.method summary:after{content:"";border-bottom:2px solid;border-right:2px solid;width:8px;height:8px;margin-left:12px;transform:rotate(45deg)}.method[open] summary:after{transform:rotate(-135deg)}.steps{gap:2px;margin:8px 0 4px;padding:0;list-style:none;display:grid}.step{border-radius:8px;grid-template-columns:2ch 1fr;gap:10px;padding:8px 10px;display:grid}.step__n{font-family:var(--mono);color:var(--muted)}.step__expr{font-family:var(--mono);color:var(--ink);overflow-wrap:anywhere}.step__text{color:var(--muted);font-size:13px}.step--diverged{background:var(--bad-bg)}.step--diverged .step__note{color:var(--bad-fg)}.step--rounding{background:var(--round-bg)}.step--rounding .step__note{color:var(--round-fg)}.step__note{margin-top:2px;font-size:13px;font-weight:600}.drill-foot{color:var(--muted);flex-wrap:wrap;grid-column:1/-1;justify-content:space-between;align-items:center;gap:12px;font-size:13px;display:flex}.report-dialog{border:1px solid var(--line);width:min(520px,100vw - 32px);color:var(--body);border-radius:14px;padding:20px}.report-dialog::backdrop{background:#0f1b2d73}.report-dialog textarea{width:100%;min-height:110px;font:inherit;border:1px solid var(--line);border-radius:8px;margin-top:6px;padding:10px}.report-dialog dl{grid-template-columns:auto 1fr;gap:4px 12px;margin:12px 0;font-size:13px;display:grid}.report-dialog dt{color:var(--muted)}.report-dialog dd{font-family:var(--mono);overflow-wrap:anywhere;margin:0}.paywall{border:1px solid var(--line);border-radius:14px;max-width:640px;padding:28px}.paywall h1{margin:8px 0 12px}.notice{background:var(--paper);border-radius:10px;margin:16px 0;padding:10px 14px;font-size:13px}.plans{border:0;grid-template-columns:repeat(3,1fr);gap:10px;margin:16px 0;padding:0;display:grid}.plan{border:1px solid var(--line);cursor:pointer;border-radius:10px;gap:4px;padding:14px;display:grid}.plan:has(input:checked){border:2px solid var(--drip);background:var(--ok-bg)}.plan__name{color:var(--ink);align-items:center;gap:8px;font-weight:600;display:flex}.plan__price{font-family:var(--mono);color:var(--ink);font-size:22px;font-weight:600}.coming{max-width:640px}.coming ul{padding-left:18px}.dev-panel{background:var(--paper);border-radius:var(--radius);margin:12px 0;padding:12px 16px}.dev-panel pre{font-size:12px;overflow:auto}@media (max-width:820px){.drill{grid-template-columns:minmax(0,1fr);gap:16px}.problem-panel,.solution{padding:16px}.plans{grid-template-columns:1fr}.site-header__inner,.site-nav{gap:14px}.brand span{display:none}}@media (max-width:600px){.topic-grid{gap:0}.topic-card,.topic-card--flagged,.topic-card--coming{border:0;border-bottom:1px solid var(--line);background:0 0;border-radius:0;flex-direction:row;justify-content:space-between;align-items:center;gap:12px;min-height:52px;padding:8px 0}.topic-card__title{justify-content:flex-start;line-height:1.3}.topic-card__count{line-height:1.3}.topic-card__status{text-align:right;flex-shrink:0;margin-top:0}.topic-card__score{flex-direction:column;align-items:flex-end;gap:0;line-height:1.2}.topic-card__pct{font-size:20px}.topic-group h2{margin-bottom:4px}}@media (max-width:820px){.crumbs__back{justify-content:center;min-width:44px;min-height:44px;margin-left:-12px}.crumbs__chevron{display:block}.crumbs__back-text{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.crumbs__sep{display:none}.link-button,.site-nav a,.brand,main p>a,main li>a{align-items:center;min-height:44px;display:inline-flex}}@media (max-width:420px){.problem-grid--patient{grid-template-columns:minmax(0,1fr)}.answer-box input{font-size:30px}.keyboard-legend{display:none}}