.revise{--lv0:var(--pm-surface-raised);--lv1:var(--pm-otto-light);--lv2:var(--pm-pencil);--lv3:#9dbdff;--lv4:#7fe0b3;--on-lv:#1b2238}.rcover{border-bottom:2px solid var(--outline)}.rcover-in{padding-block:clamp(20px,3.6vw,40px) clamp(20px,3vw,32px);padding-left:calc(var(--gutter) + clamp(18px, 4.6vw, 56px));justify-content:space-between;align-items:flex-end;gap:24px 40px;display:flex}.rcover-text{min-width:0}.rcrumbs{font-family:var(--pm-font-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--pm-ink-3);flex-wrap:wrap;gap:4px 8px;margin-bottom:12px;font-size:13px;font-weight:700;display:flex}.rcrumbs a{text-decoration:none}.rcrumbs a:hover{color:var(--pm-pink-text);text-decoration:underline}.rcover h1{letter-spacing:-.036em;max-width:18ch;font-size:clamp(34px,5.6vw,64px);line-height:1}.rcover .code-tag{border:2px solid var(--pm-on-pencil);border-radius:var(--pm-radius-full);background:var(--pm-pencil);color:var(--pm-on-pencil);letter-spacing:0;vertical-align:.6em;white-space:nowrap;margin-left:.25em;padding:.3em .75em;font-size:clamp(13px,1.4vw,17px);font-weight:700;line-height:1.2;display:inline-block;rotate:-3deg}.rfacts{color:var(--pm-ink-2);margin-top:14px;font-size:14px;font-weight:700}.revise .rcover-otto,.revise .hub-otto{flex:none;margin-bottom:-6px}.ractions{flex-wrap:wrap;gap:12px;margin-top:20px;display:flex}.rlevel{color:var(--pm-ink-2);flex-wrap:wrap;align-items:center;gap:8px 14px;margin-top:16px;font-size:15px;font-weight:700;display:flex}.rlevel-track{border:2px solid var(--outline);border-radius:var(--pm-radius-full);background:var(--pm-surface-raised);width:min(280px,60vw);height:16px;overflow:hidden}.rlevel-track span{background:var(--pm-otto);width:0;height:100%;transition:width .5s cubic-bezier(.2,.9,.3,1);display:block}.rlevel b{color:var(--pm-ink)}.rlevel-name{border:2px solid var(--pm-on-pencil);border-radius:var(--pm-radius-full);background:var(--pm-pencil);color:var(--pm-on-pencil);font-family:var(--pm-font-display);padding:3px 12px;font-weight:800}.pips{flex:none;gap:3px;display:inline-flex}.pips i{border:2px solid var(--outline);background:0 0;border-radius:4px;width:11px;height:11px}[data-level="1"] .pips i:nth-child(-n+1){background:var(--pm-otto)}[data-level="2"] .pips i:nth-child(-n+2){background:var(--pm-pencil)}[data-level="3"] .pips i:nth-child(-n+3){background:var(--pm-mug)}[data-level="4"] .pips i{background:var(--pm-hit)}.rbody{padding-block:clamp(22px,4vw,40px) clamp(40px,7vw,80px)}.rnext{margin-bottom:clamp(22px,4vw,36px);padding:18px clamp(16px,2.6vw,24px) 20px}.rnext h2{font-size:clamp(20px,2.4vw,26px)}.rnext p{color:var(--pm-ink-2);margin-top:4px}.rnext ul{grid-template-columns:repeat(auto-fill,minmax(min(100%,230px),1fr));gap:12px;margin-top:14px;display:grid}.rsection+.rsection{margin-top:clamp(26px,4.4vw,44px)}.rsection>h2{align-items:baseline;gap:12px;font-size:clamp(22px,2.8vw,30px);display:flex}.rsection>h2 .mono{border:2px solid var(--outline);background:var(--pm-surface-raised);min-width:1.9em;box-shadow:2px 2px 0 var(--pop);text-align:center;letter-spacing:0;border-radius:10px;flex:none;padding:.16em .5em;font-size:.62em;font-weight:700;translate:0 -.12em}.rtiles{grid-template-columns:repeat(auto-fill,minmax(min(100%,250px),1fr));gap:12px;margin-top:14px;display:grid}.rtile-ref{letter-spacing:.05em;text-transform:uppercase;text-overflow:ellipsis;white-space:nowrap;color:var(--pm-ink-3);font-size:11.5px;font-weight:700;overflow:hidden}.rtile{border:2px solid var(--outline);background:var(--pm-surface-raised);min-height:104px;box-shadow:3px 3px 0 var(--pop);border-radius:16px;flex-direction:column;gap:6px;padding:11px 14px 12px;text-decoration:none;transition:translate .1s,box-shadow .1s,background-color .15s;display:flex}.rtile:hover{box-shadow:5px 6px 0 var(--pop);translate:-1px -2px}.rtile:active{box-shadow:1px 1px 0 var(--pop);translate:2px 2px}.rtile b{font-family:var(--pm-font-display);letter-spacing:-.015em;font-size:18px;font-weight:800;line-height:1.12}.rtile-foot{color:var(--pm-ink-3);justify-content:space-between;align-items:center;gap:10px;margin-top:auto;padding-top:6px;font-size:13.5px;font-weight:700;display:flex}.rtile[data-level="4"]{background:color-mix(in srgb, var(--pm-hit) 14%, var(--pm-surface-raised))}.rtile .due{border-radius:var(--pm-radius-full);background:var(--pm-pink-soft);color:var(--pm-pink-text);padding:1px 8px;font-size:12.5px}.rnote{border-left:5px solid var(--pm-mug);background:var(--pm-surface-raised);max-width:70ch;color:var(--pm-ink-2);border-radius:4px 14px 14px 4px;margin-top:clamp(24px,4vw,40px);padding:14px 16px}.rsource{border-top:2px dashed var(--pm-line);color:var(--pm-ink-3);max-width:70ch;margin-top:clamp(28px,5vw,48px);padding-top:18px;font-size:14.5px}.rsource a:hover{color:var(--pm-pink-text)}.steps{top:var(--header-h);z-index:20;background:var(--header-bg);backdrop-filter:saturate(1.4)blur(10px);border-bottom:2px solid var(--outline);position:sticky}.steps-in{max-width:calc(780px + 2 * var(--gutter));gap:8px;padding-block:10px;display:flex}.step-tab{border:2px solid var(--outline);border-radius:var(--pm-radius-full);background:var(--key);min-height:48px;box-shadow:0 3px 0 var(--outline);flex:1;justify-content:center;align-items:center;gap:8px;padding:0 14px;font-size:16px;font-weight:800;line-height:1.1;transition:translate 80ms,box-shadow 80ms,background-color .12s;display:inline-flex}.step-tab .mono{background:var(--pm-surface-sunken);border-radius:50%;place-items:center;width:24px;height:24px;font-size:13px;display:grid}.step-tab:hover{background:var(--pm-pink-soft)}.step-tab[aria-selected=true]{background:var(--pm-pencil);color:var(--pm-on-pencil);border-color:var(--pm-on-pencil);box-shadow:0 1px 0 var(--pm-on-pencil);translate:0 2px}.step-tab[aria-selected=true] .mono{background:var(--pm-on-pencil);color:var(--pm-pencil)}.step{max-width:780px;scroll-margin-top:calc(var(--header-h) + 72px);margin-inline:auto;padding-block:clamp(20px,4vw,36px) clamp(40px,7vw,72px)}.step>h2{font-size:clamp(24px,3.2vw,34px)}.step-lede{color:var(--pm-ink-2);margin-top:6px}.plain{border:2px solid var(--outline);background:var(--pm-surface-raised);box-shadow:6px 6px 0 var(--pop);border-radius:22px;padding:clamp(16px,3vw,24px)}.plain p:not(.eyebrow){margin-top:8px;font-size:clamp(18px,1.9vw,21px);line-height:1.5}.step-h{margin-top:clamp(26px,4vw,38px);font-size:clamp(21px,2.6vw,27px)}.worked-card{--rule:34px;--margin-x:44px;border:2px solid var(--outline);box-shadow:4px 4px 0 var(--pop);border-radius:6px 20px 20px 6px;margin-top:14px;padding:14px 18px 20px 60px}.worked-q{font-size:17.5px;font-weight:700;line-height:1.4}.worked-card ol{counter-reset:step;margin-top:10px}.worked-card li{counter-increment:step;margin-top:8px;font-size:17px;line-height:1.45;position:relative}.worked-card li:before{content:counter(step);background:var(--pm-ink);width:24px;height:24px;color:var(--pm-surface-raised);font-family:var(--pm-font-mono);border-radius:50%;place-items:center;font-size:13px;font-weight:700;display:grid;position:absolute;top:1px;left:-40px}.worked-card li:last-child{font-weight:800}.worked-card li:last-child:before{background:var(--pm-hit);color:var(--pm-on-hit)}.tips{grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));gap:20px 18px;margin-top:22px;display:grid}.tips li{background:var(--pm-pencil);color:var(--pm-on-pencil);border-radius:2px 2px 18px;padding:18px 16px 16px;font-size:16px;font-weight:600;line-height:1.4;position:relative;rotate:-.8deg;box-shadow:3px 4px #0a0e1e33}.tips li:nth-child(2n){background:var(--pm-otto-light);rotate:.9deg}.tips li:nth-child(3n){background:#bcd3ff;rotate:-.4deg}.tips li:before{content:"";background:#ffffff8c;width:62px;height:18px;position:absolute;top:-8px;left:50%;translate:-50%;rotate:-2deg;box-shadow:0 1px #0a0e1e14}.keys{counter-reset:key;gap:14px;margin-top:14px;display:grid}.keys li{border:2px solid var(--outline);background:var(--pm-surface-raised);box-shadow:4px 4px 0 var(--pop);counter-increment:key;border-radius:18px;padding:16px 18px 16px 62px;font-size:clamp(16.5px,1.5vw,18px);line-height:1.5;position:relative}.keys li:before{content:counter(key);border:2px solid var(--pm-on-pencil);background:var(--pm-pencil);width:34px;height:34px;color:var(--pm-on-pencil);font-family:var(--pm-font-display);border-radius:50%;place-items:center;font-size:17px;font-weight:800;display:grid;position:absolute;top:14px;left:14px;rotate:-6deg}.keys li:nth-child(2n):before{background:var(--pm-otto-light);rotate:5deg}.keys li:nth-child(3n):before{background:#bcd3ff;rotate:-3deg}.step-go{flex-wrap:wrap;align-items:center;gap:12px 16px;margin-top:24px;display:flex}.step-go .hint{color:var(--pm-ink-3);font-size:14.5px}.to-notes{border-top:2px dashed var(--pm-line);color:var(--pm-ink-3);flex-wrap:wrap;align-items:center;gap:8px 14px;margin-top:18px;padding-top:18px;font-size:14.5px;display:flex}.to-notes .btn{min-height:44px;padding:0 16px;font-size:15px}.quiz-start{text-align:center;margin-top:20px;padding:clamp(20px,4vw,32px)}.quiz-start .big{font-family:var(--pm-font-display);letter-spacing:-.03em;font-size:clamp(26px,4vw,38px);font-weight:800;line-height:1.05}.quiz-start p+p{color:var(--pm-ink-2);margin-top:6px}.quiz-start .btn{min-width:200px;min-height:56px;margin-top:18px;font-size:18px}.quiz{margin-top:18px}.quiz-bar{align-items:center;gap:12px;margin-bottom:14px;display:flex}.quiz-dots{flex:1;gap:5px;display:flex}.quiz-dots li{border:2px solid var(--outline);border-radius:var(--pm-radius-full);background:var(--pm-surface-raised);flex:1;max-width:44px;height:10px}.quiz-dots .now{background:var(--pm-pencil)}.quiz-dots .right{background:var(--pm-hit)}.quiz-dots .wrong{background:var(--pm-otto)}.quiz-count{color:var(--pm-ink-3);font-size:14px;font-weight:700}.qcard{border:2px solid var(--outline);background:var(--pm-surface-raised);box-shadow:6px 6px 0 var(--pop);border-radius:24px;padding:clamp(18px,3.4vw,28px)}.qcard.in{animation:.26s cubic-bezier(.2,.9,.3,1.2) deal}@keyframes deal{0%{opacity:0;translate:18px;rotate:1.5deg}}.qtags{align-items:center;gap:10px;margin-bottom:8px;display:flex}.stretch{border-radius:var(--pm-radius-full);background:var(--pm-mug-soft);color:var(--pm-mug-text);padding:1px 9px;font-size:12.5px;font-weight:700}.qtext{font-family:var(--pm-font-text);letter-spacing:0;text-wrap:pretty;font-size:clamp(19px,2.3vw,23px);font-weight:700;line-height:1.35}.qtext:focus{outline:none}.qopts{gap:10px;margin-top:18px;display:grid}.qopts button{border:2px solid var(--outline);background:var(--key);width:100%;min-height:56px;box-shadow:0 3px 0 var(--outline);text-align:left;border-radius:16px;align-items:center;gap:12px;padding:10px 14px;font-size:17px;font-weight:600;line-height:1.35;transition:translate 80ms,box-shadow 80ms,background-color .12s;display:flex}.qopts kbd{background:var(--pm-surface-sunken);width:30px;height:30px;font-family:var(--pm-font-mono);color:var(--pm-ink-3);border-radius:10px;flex:none;place-items:center;font-size:14px;font-weight:700;display:grid}@media (hover:hover){.qopts button:not(:disabled):hover{background:var(--pm-pink-soft)}}.qopts button:not(:disabled):active{box-shadow:0 1px 0 var(--outline);translate:0 2px}.qopts button:disabled{cursor:default;color:var(--pm-ink-3);box-shadow:none;translate:0 2px}.qopts button.is-right{border-color:var(--on-lv);background:var(--lv4);color:var(--on-lv)}.qopts button.is-right kbd{background:var(--on-lv);color:var(--lv4)}.qopts button.is-wrong{border-color:var(--on-lv);background:var(--lv1);color:var(--on-lv);animation:.3s shake}.qopts button.is-wrong kbd{background:var(--on-lv);color:var(--lv1)}@keyframes shake{25%{translate:-5px 2px}60%{translate:4px 2px}}.qwhy{border-left:5px solid var(--pm-hit);background:var(--pm-surface-sunken);border-radius:4px 12px 12px 4px;margin-top:16px;padding:12px 14px;font-size:16.5px;line-height:1.5}.qwhy.missed{border-left-color:var(--pm-otto)}.quiz-foot{justify-content:flex-end;min-height:56px;margin-top:16px;display:flex}.quiz-foot .btn{min-width:160px;min-height:54px;font-size:17px}.result{margin-top:20px;padding:clamp(20px,4vw,30px)}.result-top{align-items:center;gap:clamp(14px,3vw,26px);display:flex}.result-otto{filter:drop-shadow(0 8px 10px #0a0e1e38);flex:none;width:clamp(92px,20vw,132px);height:auto;rotate:-5deg}.result-score{font-family:var(--pm-font-display);letter-spacing:-.04em;font-size:clamp(44px,8vw,72px);font-weight:800;line-height:.95}.result-score small{letter-spacing:-.01em;color:var(--pm-ink-3);font-size:.42em}.result-line{margin-top:8px;font-size:17.5px;font-weight:700}.result-level{border:2px solid var(--outline);border-radius:var(--pm-radius-full);background:var(--pm-surface-raised);align-items:center;gap:8px;margin-top:10px;padding:5px 12px;font-size:14.5px;font-weight:800;display:inline-flex}.result-missed{border-top:2px dashed var(--pm-line);margin-top:20px;padding-top:16px}.result-missed h3{font-size:18px}.result-missed li{margin-top:12px;font-size:15.5px;line-height:1.45}.result-missed li b{display:block}.result-missed li span{color:var(--pm-ink-2)}.result-actions{flex-wrap:wrap;gap:12px;margin-top:22px;display:flex}.sheet-tools{flex-wrap:wrap;gap:10px;margin-top:16px;display:flex}.sheet-tools .btn{min-height:44px;padding:0 16px;font-size:15px}.sheet{border:2px solid var(--outline);box-shadow:6px 6px 0 var(--pop);border-radius:6px 22px 22px 6px;margin-top:20px;padding:clamp(18px,3.4vw,30px)}.sheet-head{display:none}.sheet-qs{counter-reset:sheet}.sheet-qs>li{counter-increment:sheet;padding:0 0 20px 40px;position:relative}.sheet-qs>li+li{border-top:2px dashed var(--pm-line);padding-top:20px}.sheet-qs>li:before{content:counter(sheet);font-family:var(--pm-font-display);font-size:22px;font-weight:800;line-height:1.25;position:absolute;left:0}.sheet-q{justify-content:space-between;gap:14px;font-size:17.5px;font-weight:600;line-height:1.45;display:flex}.sheet-q .marks{font-family:var(--pm-font-mono);color:var(--pm-ink-3);flex:none;font-size:14.5px;font-weight:700}.sheet-lines{display:none}.sheet-a{margin-top:10px}.sheet-a summary{border:2px solid var(--pm-control-border);border-radius:var(--pm-radius-full);cursor:pointer;align-items:center;gap:6px;min-height:40px;padding:0 14px;font-size:14.5px;font-weight:800;list-style:none;display:inline-flex}.sheet-a summary::-webkit-details-marker{display:none}.sheet-a summary:hover{border-color:var(--pm-ink)}.sheet-a[open] summary{border-color:var(--pm-ink);background:var(--pm-surface-sunken)}.sheet-a[open] summary .when-closed,.sheet-a:not([open]) summary .when-open{display:none}.sheet-a .ans{border-left:5px solid var(--pm-hit);background:var(--pm-surface-sunken);border-radius:4px 12px 12px 4px;margin-top:10px;padding:12px 14px;font-size:16.5px;line-height:1.5}.sheet-tick{color:var(--pm-ink-2);cursor:pointer;align-items:center;gap:8px;margin-top:10px;font-size:14.5px;font-weight:700;display:inline-flex}.sheet-tick input{width:20px;height:20px;accent-color:var(--pm-hit)}.sheet-answers{display:none}.rpager{justify-content:space-between;gap:12px;max-width:780px;margin:0 auto clamp(40px,7vw,72px);display:flex}.rpager a{border:2px solid var(--outline);background:var(--pm-surface-raised);max-width:48%;box-shadow:3px 3px 0 var(--pop);border-radius:16px;flex-direction:column;gap:2px;padding:10px 16px;font-weight:800;line-height:1.2;text-decoration:none;display:flex}.rpager a:hover{background:var(--pm-pink-soft)}.rpager a span{font-family:var(--pm-font-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--pm-ink-3);font-size:12px}.rpager .fwd{text-align:right;margin-left:auto}.quick{border:2px solid var(--outline);background:var(--pm-surface);width:min(680px,100vw - 24px);max-height:calc(100dvh - 24px);color:var(--pm-ink);box-shadow:8px 8px 0 var(--pop);border-radius:26px;padding:clamp(16px,3vw,24px);overflow-y:auto}.quick::backdrop{backdrop-filter:blur(3px);background:#12162b9e}.quick-head{justify-content:space-between;align-items:center;gap:12px;display:flex}.quick-head h2{font-size:clamp(22px,3vw,28px)}.quick-close{border:2px solid var(--outline);background:var(--pm-surface-raised);border-radius:50%;place-items:center;width:44px;height:44px;padding:0;font-size:22px;font-weight:800;line-height:1;display:grid}.quick-close:hover{background:var(--pm-pink-soft)}.quick .qcard,.quick .result{box-shadow:4px 4px 0 var(--pop)}.hub-hero{border-bottom:2px solid var(--outline)}.hub-hero-in{padding-block:clamp(24px,4.4vw,52px) clamp(22px,3.6vw,40px);padding-left:calc(var(--gutter) + clamp(18px, 4.6vw, 56px));justify-content:space-between;align-items:flex-end;gap:24px 40px;display:flex}.hub-hero h1{letter-spacing:-.04em;font-size:clamp(40px,7vw,84px);line-height:.96}.hub-hero .lede{margin-top:16px}.hub-how{flex-wrap:wrap;gap:10px;margin-top:20px;display:flex}.hub-how li{border:2px solid var(--outline);border-radius:var(--pm-radius-full);background:var(--pm-surface-raised);box-shadow:2px 2px 0 var(--pop);align-items:center;gap:8px;padding:7px 14px 7px 8px;font-size:15px;font-weight:800;display:inline-flex}.hub-how .mono{background:var(--pm-pencil);width:26px;height:26px;color:var(--pm-on-pencil);border-radius:50%;place-items:center;font-size:13px;display:grid}.hub-body{padding-block:clamp(22px,4vw,40px) clamp(40px,7vw,80px)}.hub-mine{margin-bottom:clamp(24px,4vw,40px)}.hub-mine h2,.hub-shelf h2{font-size:clamp(24px,3vw,32px)}.hub-find{border:2px solid var(--outline);border-radius:var(--pm-radius-full);background:var(--key);max-width:520px;height:56px;box-shadow:0 4px 0 var(--outline);align-items:center;gap:10px;margin-bottom:clamp(20px,3.4vw,32px);padding:0 18px;display:flex}.hub-find:focus-within{outline:3px solid var(--pm-focus);outline-offset:3px}.hub-find input{background:0 0;border:0;outline:0;flex:1;min-width:0;font-size:18px;font-weight:700}.hub-find input::placeholder{color:var(--pm-ink-3);font-weight:600}.hub-shelf+.hub-shelf{margin-top:clamp(26px,4.4vw,44px)}.hub-shelf h2 small{font-family:var(--pm-font-mono);letter-spacing:0;color:var(--pm-ink-3);margin-left:8px;font-size:13px;font-weight:700}.hub-grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,250px),1fr));gap:12px;margin-top:14px;display:grid}.hub-card{border:2px solid var(--outline);background:var(--pm-surface-raised);min-height:104px;box-shadow:4px 4px 0 var(--pop);border-radius:18px;flex-direction:column;justify-content:space-between;gap:12px;padding:14px 16px 12px;text-decoration:none;transition:translate .1s,box-shadow .1s;display:flex}.hub-card:hover{box-shadow:6px 7px 0 var(--pop);translate:-1px -2px}.hub-card:active{box-shadow:1px 1px 0 var(--pop);translate:2px 2px}.hub-card b{font-family:var(--pm-font-display);letter-spacing:-.02em;font-size:21px;font-weight:800;line-height:1.08}.hub-card .where{color:var(--pm-ink-3);margin-top:3px;font-size:13.5px;font-weight:700;display:block}.hub-card-foot{color:var(--pm-ink-3);justify-content:space-between;align-items:center;gap:10px;font-size:13.5px;font-weight:700;display:flex}.hub-card-foot .mono{border:2px solid var(--pm-on-pencil);border-radius:var(--pm-radius-full);background:var(--pm-pencil);color:var(--pm-on-pencil);padding:2px 9px;font-size:12.5px}.hub-card .bar{border:2px solid var(--outline);border-radius:var(--pm-radius-full);background:var(--pm-surface-raised);height:8px;overflow:hidden}.hub-card .bar span{background:var(--pm-otto);height:100%;display:block}.hub-none{color:var(--pm-ink-2);margin-top:14px}.hub-later{max-width:760px;margin-top:clamp(28px,5vw,48px);padding:18px 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