:root{--paper:#f2f3f5;--surface:#fff;--ink:#0d0f14;--ink-2:#3a404c;--ink-3:#5e6470;--line:#dadde3;--pop:#ff4a1c;--rail:280px}
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.sidebar{position:fixed;inset:0 auto 0 0;width:var(--rail);display:flex;flex-direction:column;padding:39px 24px 0;background:var(--paper);border-right:1px solid var(--line);z-index:30}.brand{display:block;position:relative;text-decoration:none;font-size:32px;line-height:.94;letter-spacing:-1.4px;font-weight:500;width:max-content}.brand strong{font-weight:600}.brand-mark{position:absolute;left:147px;top:3px;font:400 28px/1 'DM Sans',sans-serif}.sidebar-intro{font-size:13px;color:var(--ink-3);margin:17px 0 25px}.search{display:flex;align-items:center;gap:10px;height:44px;border-bottom:1px solid var(--line)}.search>span{font-size:25px;line-height:1;color:var(--ink-3)}.search input{width:100%;min-width:0;background:none;border:0;color:var(--ink);font-size:13px;padding:8px 0}.search input::placeholder{color:var(--ink-3)}.search input:focus-visible{outline-offset:0}.filters{display:flex;gap:25px;margin:11px 0 20px}.filters button{padding:8px 0;font-size:12px;color:var(--ink-3);border-bottom:2px solid transparent}.filters button[aria-pressed=true]{color:var(--ink);font-weight:700;border-bottom-color:var(--ink)}#question-list{flex:1;overflow:auto;min-height:0;margin:0 -12px;padding:0 12px 24px;scrollbar-width:thin;scrollbar-color:var(--line) transparent}.question-group{margin:0 0 8px}.group-title{display:flex;align-items:center;gap:8px;width:100%;min-height:43px;padding:9px 0;text-align:left;font-size:13px;font-weight:600;color:var(--ink)}.group-title .chevron{font-size:16px;width:12px;color:var(--ink-3)}.group-title .group-count{margin-left:auto;color:var(--ink-3);font-size:12px;font-weight:400}.question-item{min-height:44px;position:relative;display:flex;gap:12px;align-items:start;width:100%;padding:9px 0;text-align:left;font-size:14px;line-height:1.45;color:var(--ink-3);border-radius:5px}.question-item:hover{color:var(--ink)}.question-item[aria-current=true]{color:var(--ink);font-weight:500}.q-index{font-size:12px;line-height:1.7;min-width:20px;color:var(--ink-3);font-variant-numeric:tabular-nums}.question-item[aria-current=true] .q-index{font-size:0;position:relative}.question-item[aria-current=true] .q-index:before{content:'';position:absolute;left:4px;top:6px;width:9px;height:9px;border-radius:50%;background:var(--pop)}.q-name{flex:1}.q-dot{font-size:12px;color:var(--ink-3);align-self:center}.empty-list{padding:12px 0;font-size:14px;color:var(--ink-3);line-height:1.7}.sidebar-bottom{padding:20px 0 24px;border-top:1px solid var(--line)}#progress-label{font-size:12px;font-weight:500;color:var(--ink-3)}.progress-track{height:4px;border-radius:4px;background:var(--line);margin-top:11px;overflow:hidden}.progress-track span{display:block;height:100%;background:var(--pop);border-radius:4px;transition:width .2s}.sidebar-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:21px}.sidebar-foot a,.sidebar-foot button{font-size:12px;padding:0;text-decoration:none;color:var(--ink)}.portfolio-link{font-size:12px;color:var(--ink-3);display:block;margin-top:18px;text-decoration:none}.portfolio-link:hover,.sidebar-foot a:hover,.sidebar-foot button:hover{text-decoration:underline}
.workspace{margin-left:var(--rail);min-height:100vh;position:relative}.topbar{display:none}main{max-width:1456px;margin:auto;padding:66px 64px 130px}.question-stage{display:grid;grid-template-columns:minmax(0,1fr) 208px;column-gap:64px;row-gap:35px;align-items:start}.question-meta{grid-column:1/-1;display:flex;flex-wrap:wrap;align-items:center;gap:11px;font-size:12px;color:var(--ink-3)}#question-number{color:var(--ink);font-variant-numeric:tabular-nums;white-space:nowrap}.meta-divider{color:var(--line)}#section-name{color:var(--ink);font-weight:500}#question-type:before,#question-difficulty:before{content:'·';margin-right:11px}.bookmark{margin-left:auto;font-size:12px;min-height:32px;padding:4px 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p{font-size:14px;line-height:1.75;color:var(--ink-3)}.story-block a{font-size:12px;text-decoration:none;display:inline-block;margin-top:18px}.story-block a:hover{text-decoration:underline}.followup-section{margin-top:76px}.followup{border-top:1px solid var(--line)}.followup:last-child{border-bottom:1px solid var(--line)}.followup summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:30px;padding:23px 0;font-size:16px;line-height:1.5;font-weight:500}.followup summary::-webkit-details-marker{display:none}.followup summary:after{content:'+';font-size:24px;font-weight:400;flex:none}.followup[open] summary:after{content:'−'}.followup p{font-size:16px;line-height:1.8;color:var(--ink-2);max-width:78ch;padding:0 35px 28px 0}.pitfalls{margin-top:61px}.pitfalls ul{font-size:15px;line-height:1.8;color:var(--ink-3);margin:19px 0 0;padding-left:18px;max-width:83ch}.pitfalls li{padding-left:5px;margin:8px 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h2{font-weight:600;font-size:clamp(40px,4vw,64px);line-height:1.02;letter-spacing:-.035em;margin-bottom:32px}.primary-button{position:relative;z-index:1;display:inline-flex;gap:35px;align-items:center;border-radius:999px;min-height:47px;padding:14px 22px;background:var(--ink);color:var(--surface);font-size:14px}.bottom-nav{position:fixed;left:var(--rail);right:0;bottom:0;height:86px;padding:18px 64px;background:color-mix(in srgb,var(--surface) 94%,transparent);backdrop-filter:blur(12px);border-top:1px solid var(--line);z-index:20;display:flex;align-items:center;gap:25px}.previous-button{display:flex;align-items:center;gap:12px;min-height:44px;font-size:14px;padding:10px 0}.nav-position{font-size:13px;color:var(--ink-3);font-variant-numeric:tabular-nums;margin-left:auto}.random-button{font-size:25px;padding:6px 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p{font-size:14px;line-height:1.6;color:var(--ink-3)}pre{overflow:auto;background:var(--ink);color:var(--paper);border-radius:16px;padding:25px;font-size:13px;line-height:1.8;tab-size:2;max-width:100%}code{font-family:ui-monospace,monospace}.skip-link{position:fixed;top:-80px;left:calc(var(--rail) + 20px);z-index:100;background:var(--ink);color:var(--surface);padding:14px;font-size:14px}.skip-link:focus{top:12px}.close-menu,.mobile-menu{display:none}.icon-button{padding:8px;min-width:44px;min-height:44px;font-size:24px}.scrim{position:fixed;inset:0;background:color-mix(in srgb,var(--ink) 30%,transparent);backdrop-filter:blur(3px);z-index:29}body.menu-open{overflow:hidden}
@media(min-width:1700px){main{padding-left:88px;padding-right:88px}.question-stage{column-gap:95px}.answer-grid{grid-template-columns:minmax(0,1fr) 260px;gap:84px}}
@media(max-width:1200px){:root{--rail:260px}.sidebar{padding-left:21px;padding-right:21px}main{padding:55px 42px 125px}.question-stage{grid-template-columns:minmax(0,1fr) 170px;column-gap:35px}.orbit{padding-top:13px}.orbit-face{width:135px}.orbit-face:after{width:180px;height:64px}#timer{font-size:30px}.answer-grid{grid-template-columns:minmax(0,1fr) 200px;gap:36px}.story-block{padding:20px}.bottom-nav{padding-left:42px;padding-right:42px}.confidence{align-items:flex-start;flex-direction:column}.question-meta{gap:9px}#question-type:before,#question-difficulty:before{margin-right:9px}.question-prompt{font-size:15px}}
@media(max-width:1000px) and (min-width:761px){:root{--rail:240px}main{padding-left:32px;padding-right:32px}.sidebar{padding-left:18px;padding-right:18px}.question-stage{grid-template-columns:minmax(0,1fr) 110px;column-gap:25px}.orbit-face{width:100px}.orbit-face:after{width:134px;height:45px}#timer{font-size:24px}.timer-actions{gap:2px;flex-wrap:wrap;justify-content:center}.timer-actions button{font-size:12px;gap:4px}.answer-grid{grid-template-columns:1fr;gap:40px}.answer-rail{display:grid;grid-template-columns:1fr 1fr;gap:28px}.rail-block{margin:0}.story-block{grid-column:1/-1}.question-meta #question-type{display:none}.bottom-nav{padding-left:32px;padding-right:32px;gap:16px}.next-button{gap:20px;padding-left:18px;padding-right:18px}}
@media(max-width:760px){:root{--rail:0px}.sidebar{width:300px;max-width:90vw;transform:translateX(-100%);transition:transform .2s;padding:29px 23px 0}.sidebar.open{transform:translateX(0)}.close-menu{display:block;position:absolute;right:15px;top:22px}.brand{font-size:30px}.brand-mark{left:137px}.sidebar-intro{margin:15px 0 18px}.filters{margin-bottom:15px}.filters button{min-height:44px}.group-title{font-size:13px}.sidebar-bottom{padding-bottom:22px}.topbar{display:flex;justify-content:space-between;align-items:center;height:56px;padding:0 17px;border-bottom:1px solid var(--line)}.mobile-menu{display:block;font-size:19px}.resume-link{font-size:13px;text-decoration:none;padding:12px 7px}.workspace{margin:0}main{padding:28px 24px 114px}.question-stage{grid-template-columns:1fr;gap:24px}.question-meta{grid-column:1;grid-row:1;font-size:12px;gap:9px;line-height:1.7}.question-meta #question-type{display:none}.question-meta #question-difficulty:before{margin-right:9px}.bookmark{font-size:12px;min-height:44px}.question-body{grid-row:3}.orbit{grid-row:2;display:flex;justify-content:flex-start;align-items:center;gap:32px;padding:0 0 0 12px}.orbit-face{width:72px;flex:none}.orbit-face:after{width:99px;height:34px;border-width:1px}.orbit[data-running] .orbit-face:before{inset:5px}#timer{font-size:18px}.timer-actions{gap:21px}.timer-actions button{font-size:13px;min-height:44px;gap:9px}#timer-reset{font-size:24px}.question-stage h1{font-size:clamp(40px,11vw,56px);max-width:16ch;line-height:1.02;letter-spacing:-.035em}.question-prompt{font-size:14px;line-height:1.75;margin-top:22px;max-width:none}.mode-bar{margin:30px 0 35px}.mode-tabs button{font-size:13px;padding:10px 18px}.answer-grid{grid-template-columns:1fr;gap:36px}.section-label{margin-bottom:22px}.section-label h2,.rail-block h2,.pitfalls h2{font-size:13px}#answer-text p{font-size:17px;line-height:1.75;margin-bottom:25px}#answer-text p:first-child{font-size:20px;line-height:1.6}.answer-rail{display:block;border-top:1px solid var(--line);padding-top:28px}.rail-block{margin-bottom:28px}.rail-block p{font-size:14px}.story-block{padding:24px}.story-block h3{font-size:24px}.followup-section{margin-top:52px}.followup summary{font-size:15px;padding:19px 0;gap:16px}.followup p{font-size:15px;padding-right:0}.pitfalls{margin-top:42px}.pitfalls ul{font-size:14px}.sources{margin-top:31px;font-size:12px}.sources summary{font-size:13px}.notes-section{margin-top:46px;padding:23px 18px;border-radius:20px}.notes-heading{gap:12px;align-items:flex-start}.notes-heading h2{font-size:26px}#save-state{font-size:12px;max-width:150px}.notes-section textarea{font-size:16px;padding:15px;min-height:130px}.confidence{flex-direction:column;align-items:flex-start;gap:12px}.confidence>div{width:100%;gap:5px;justify-content:space-between}.confidence button{font-size:12px;padding:9px 10px;min-height:44px}.bottom-nav{height:77px;padding:13px 20px;gap:14px}.previous-button{font-size:13px;gap:9px}.nav-position{font-size:12px}.random-button{display:none}.next-button{min-height:47px;font-size:13px;padding:12px 18px;gap:21px}.next-button>span:last-child{font-size:20px}.toast-container{bottom:92px;padding:0 16px}.toast{font-size:13px;padding:12px 18px;border-radius:20px}.practice-cover{padding:35px 27px;border-radius:22px}.practice-cover h2{font-size:42px;margin-bottom:29px}.practice-cover:after{width:210px;height:210px;bottom:-140px;right:-125px}.primary-button{font-size:13px}.eval-layers{grid-template-columns:1fr;gap:21px;margin-top:30px}.eval-layer{display:grid;grid-template-columns:27px 1fr;column-gap:12px}.eval-layer span{grid-row:1/3;padding-top:2px}.eval-layer h3{margin:0 0 5px}.eval-layer p{grid-column:2}pre{font-size:13px;padding:18px;border-radius:13px}.skip-link{left:14px}}
@media(max-width:360px){main{padding-left:20px;padding-right:20px}.question-meta{gap:7px}.question-meta #question-difficulty{display:none}.bottom-nav{padding-left:14px;padding-right:14px;gap:10px}.next-button{gap:14px;padding-left:15px;padding-right:15px}.confidence button{padding-left:8px;padding-right:8px}.notes-section{padding-left:14px;padding-right:14px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}