:root{--paper:#f7f6f3;--surface:#fff;--ink:#292634;--muted:#736e7d;--line:#e3e0e8;--accent:#6550c8;--tint:#efecfa;--green:#247659;--green-bg:#eef7f1;--red:#ad3b41;--red-bg:#fff2f2;--mono:ui-monospace,SFMono-Regular,Consolas,monospace;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:wait;opacity:.6}button,a,input,select,summary{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #a194e9;outline-offset:3px}button{color:inherit}a{color:var(--accent);text-underline-offset:3px}h1,h2,h3,p{margin:0}h1{font-size:clamp(27px,4vw,39px);font-weight:650;letter-spacing:-1.1px;line-height:1.2}h2{font-size:21px;letter-spacing:-.45px;line-height:1.35}h3{font-size:16px;line-height:1.45}p{line-height:1.65}small,.muted{color:var(--muted)}small{line-height:1.5}button{border:0;background:none}button,input,select{min-height:46px}input,select{width:100%;border:1px solid var(--line);border-radius:7px;background:white;padding:11px 12px;color:var(--ink)}label{display:block;font-size:13px;font-weight:600;margin-bottom:8px}hr{border:0;border-top:1px solid var(--line);margin:28px 0}.skip{position:fixed;left:12px;top:-100px;background:white;padding:12px;z-index:100}.skip:focus{top:12px}.loading{padding:60px 24px;text-align:center;color:var(--muted)}.shell{min-height:100svh}.sidebar{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.brand-line{display:flex;align-items:center;justify-content:space-between;padding:15px 20px 10px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}.brand img{width:33px;height:33px}.brand strong{font-size:20px;letter-spacing:-.65px;display:block}.brand span{display:block;font-size:10px;letter-spacing:1.7px;color:var(--muted);margin-top:2px}.mobile-logout{font-size:12px;color:var(--muted);padding:0 4px;min-height:36px}.nav{display:grid;grid-template-columns:repeat(4,1fr);padding:3px 12px 0;gap:2px}.nav button{font-size:12px;color:var(--muted);padding:12px 0;border-bottom:2px solid transparent;min-height:47px;white-space:nowrap}.nav button.active{color:var(--accent);border-color:var(--accent);font-weight:650}.nav svg{display:none}.sidebar-bottom{display:none}.main{max-width:1150px;margin:0 auto;padding:28px 20px 50px;animation:appear .18s ease-out}.page-top{margin-bottom:28px}.eyebrow{font-size:11px;font-weight:650;letter-spacing:1.3px;color:var(--muted);margin-bottom:10px}.page-top p{font-size:14px;color:var(--muted);margin-top:12px}.top-line{display:flex;align-items:center;justify-content:space-between;gap:12px}.tag{font-size:11px;border:1px solid var(--line);padding:5px 8px;border-radius:5px;white-space:nowrap;color:var(--muted)}.button{display:inline-flex;align-items:center;justify-content:center;gap:12px;padding:13px 20px;min-height:48px;border-radius:7px;font-size:14px;font-weight:600;background:var(--accent);color:#fff;text-decoration:none;transition:background .15s,transform .15s}.button:hover{background:#5540b6}.button:active{transform:translateY(1px)}.button.secondary{background:var(--surface);color:var(--ink);border:1px solid var(--line)}.button.secondary:hover{background:#f2f0f6}.button.quiet{background:transparent;color:var(--muted);padding-inline:12px}.button.dark{background:var(--ink)}.button.full{width:100%}.button svg{width:17px;height:17px}.text-button{color:var(--accent);font-size:13px;font-weight:600;padding:8px 0;min-height:44px}.daily-workspace{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:25px 22px;margin-bottom:28px}.daily-workspace .lead{font-size:14px;color:var(--muted);margin-top:9px;max-width:400px}.daily-number{font-size:77px;letter-spacing:-5px;font-weight:600;line-height:1;margin-top:25px}.daily-number span{font-size:13px;letter-spacing:0;color:var(--muted);font-weight:400;margin-left:10px}.daily-breakdown{display:flex;gap:22px;margin:22px 0 24px;font-size:13px;color:var(--muted)}.daily-breakdown strong{color:var(--ink);font-size:17px;font-weight:600;display:block;margin-bottom:3px}.workspace-side{border-top:1px solid var(--line);margin-top:26px;padding-top:23px}.week-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px;font-size:13px}.streak{color:var(--accent);font-size:12px}.week{display:flex;justify-content:space-between;gap:5px}.weekday{display:flex;flex-direction:column;align-items:center;gap:8px;font-size:10px;color:var(--muted);flex:1}.day-dot{height:31px;width:31px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;font-size:12px;background:var(--paper)}.weekday.today .day-dot{outline:2px solid #cfc5fa;outline-offset:3px}.weekday.done .day-dot{background:var(--accent);color:white;border-color:var(--accent)}.week-note{font-size:12px;color:var(--muted);margin-top:24px}.section-title{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:26px 0 15px}.section-title small{font-size:11px}.domain-list{border-top:1px solid var(--line)}.domain-row{width:100%;display:grid;grid-template-columns:27px 1fr auto;align-items:center;gap:11px;padding:16px 0;border-bottom:1px solid var(--line);text-align:left;min-height:74px;transition:background .15s}.domain-row:hover{background:#f0eef5}.domain-no{font-family:var(--mono);font-size:12px;color:#9b94a9}.domain-name{font-size:13px;font-weight:550;line-height:1.45}.domain-sub{font-size:11px;color:var(--muted);margin-top:4px}.domain-count{font-size:12px;color:var(--muted);white-space:nowrap}.topic-progress{display:block;width:100%;height:3px;border:0;margin-top:9px;border-radius:5px;appearance:none;background:var(--line)}.topic-progress::-webkit-progress-bar{background:var(--line);border-radius:5px}.topic-progress::-webkit-progress-value{background:var(--accent);border-radius:5px}.topic-progress::-moz-progress-bar{background:var(--accent);border-radius:5px}.exam-strip{background:var(--ink);color:#fff;margin-top:28px;border-radius:10px;padding:24px;display:flex;flex-wrap:wrap;align-items:center;gap:22px}.exam-strip h2{font-size:19px}.exam-strip p{color:#c5c0d1;font-size:12px;margin-top:7px}.exam-strip .button{background:#fff;color:var(--ink)}.session-resume{border-left:3px solid var(--accent);padding:10px 15px;display:flex;align-items:center;gap:15px;justify-content:space-between;margin:20px 0;background:var(--tint)}.session-resume p{font-size:12px}.session-resume strong{font-size:13px}.stats-row{display:grid;grid-template-columns:repeat(3,1fr);border-bottom:1px solid var(--line);padding-bottom:24px;margin:20px 0 28px;gap:14px}.stat strong{display:block;font-family:var(--mono);font-size:27px;font-weight:500;letter-spacing:-1.5px}.stat span{font-size:11px;color:var(--muted);display:block;margin-top:7px}.form-row{display:grid;gap:20px;margin:25px 0}.field-note{font-size:12px;color:var(--muted);margin-top:7px}.practice-form{max-width:660px}.practice-form .button{width:100%;margin-top:6px}.topic-heading{font-size:17px;margin-top:42px}.exam-preview{background:var(--surface);border-top:3px solid var(--accent);padding:28px 23px;max-width:790px}.exam-facts{display:flex;gap:30px;margin:30px 0}.exam-facts strong{display:block;font-family:var(--mono);font-size:36px;font-weight:500;letter-spacing:-2px}.exam-facts span{font-size:12px;color:var(--muted)}.rules{padding-left:19px;color:var(--muted);font-size:13px;line-height:1.8;margin:0 0 28px}.rules li{padding-left:5px;margin-bottom:10px}.fine-print{font-size:12px;color:var(--muted);line-height:1.6;margin-top:22px;max-width:700px}.history{width:100%;border-collapse:collapse;font-size:12px}.history td,.history th{border-bottom:1px solid var(--line);padding:13px 6px;text-align:left}.history th{font-weight:500;color:var(--muted);font-size:11px}.history button{color:var(--accent);font-weight:600;font-size:12px;padding:4px;white-space:nowrap}.empty{padding:28px 0;font-size:14px;color:var(--muted)}.history-wrap{overflow-x:auto}.chart{width:100%;height:155px;overflow:visible;display:block;margin:22px 0}.chart rect{fill:#cfc7eb}.chart rect.current{fill:var(--accent)}.chart text{fill:var(--muted);font:10px -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.chart .bar-count{fill:var(--ink);font-family:var(--mono);font-size:12px}.chart line{stroke:var(--line)}.study-header{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:19px}.study-header .text-button{color:var(--muted)}.timer{font:500 19px var(--mono);letter-spacing:-.5px;background:var(--tint);color:var(--accent);padding:10px 12px;border-radius:6px;white-space:nowrap}.timer.urgent{color:var(--red);background:var(--red-bg)}.study-progress{width:100%;height:4px;display:block;accent-color:var(--accent);appearance:none;border:0;background:var(--line);margin-bottom:27px}.study-progress::-webkit-progress-bar{background:var(--line)}.study-progress::-webkit-progress-value{background:var(--accent);transition:width .2s}.study-progress::-moz-progress-bar{background:var(--accent)}.question-panel{min-width:0}.question-meta{display:flex;flex-wrap:wrap;align-items:center;gap:9px;font-size:11px;color:var(--muted);margin-bottom:20px}.question-meta .objective{font-family:var(--mono);background:var(--tint);color:var(--accent);padding:4px 6px;border-radius:3px}.question-title{font-size:clamp(19px,2.1vw,24px);font-weight:550;letter-spacing:-.3px;line-height:1.55;white-space:pre-wrap;overflow-wrap:anywhere}.code-block{background:#282634;color:#e6e2f4;border-radius:8px;padding:20px;font:12px/1.75 var(--mono);overflow:auto;margin:22px 0;tab-size:2}.select-help{font-size:12px;color:var(--muted);margin:19px 0 15px}.options{display:grid;gap:10px}.option{display:flex;align-items:flex-start;text-align:left;gap:13px;width:100%;background:#fff;border:1px solid #ddd9e4;border-radius:8px;padding:15px;min-height:56px;transition:border-color .15s,background .15s;font-size:14px;line-height:1.6;overflow-wrap:anywhere}.option:hover{border-color:#b3a9d9;background:#fcfbfe}.option.selected{border-color:var(--accent);background:var(--tint);box-shadow:0 0 0 1px var(--accent)}.letter{display:grid;place-items:center;flex:none;width:25px;height:25px;border:1px solid #d6d0df;border-radius:50%;font:11px var(--mono);margin-top:1px;color:var(--muted)}.multiple .letter{border-radius:5px}.option.selected .letter{color:white;background:var(--accent);border-color:var(--accent)}.option-text{flex:1;min-width:0}.option.correct-option{border-color:#b4d6c4;background:var(--green-bg)}.option.wrong-option{border-color:#e6b5b7;background:var(--red-bg)}.option.correct-option .letter{background:var(--green);border-color:var(--green);color:white}.option.wrong-option .letter{background:var(--red);border-color:var(--red);color:white}.option-explanation{font-size:12px;color:var(--muted);margin-top:8px;line-height:1.7}.answer-badge{font-size:10px;color:var(--muted);margin-left:7px}.explanation{padding:22px 0;border-bottom:1px solid var(--line);margin-top:12px;animation:appear .2s ease-out}.result-label{display:flex;align-items:center;gap:8px;font-weight:600;font-size:14px;color:var(--green);margin-bottom:10px}.result-label.wrong{color:var(--red)}.explanation p{font-size:14px;line-height:1.8;white-space:pre-wrap}.explanation a{display:inline-flex;align-items:center;font-size:12px;margin-top:15px;min-height:42px}.question-actions{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:25px 0;padding-bottom:8px}.question-actions .button{padding-inline:15px}.question-secondary{display:flex;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding-top:10px}.flag-button{display:flex;align-items:center;gap:7px;color:var(--muted);font-size:12px;padding:10px 0}.flag-button.flagged{color:var(--accent)}.flag-button svg{width:16px;height:16px}.save-state{font-size:11px;color:var(--muted);display:flex;align-items:center}.palette-wrap{border-top:1px solid var(--line);margin-top:24px;padding-top:4px}.palette-wrap summary{font-size:13px;font-weight:600;padding:17px 0;cursor:pointer}.palette{display:grid;grid-template-columns:repeat(6,1fr);gap:6px}.palette button{min-height:44px;aspect-ratio:1;font:11px var(--mono);border:1px solid var(--line);border-radius:5px;background:var(--surface);position:relative}.palette button.answered{background:var(--tint);border-color:#cbbfed;color:var(--accent)}.palette button.current{border:2px solid var(--accent)}.palette button.marked:after{content:'';width:5px;height:5px;position:absolute;top:3px;right:3px;background:var(--accent);border-radius:50%}.palette button.right{background:var(--green-bg);border-color:#b4d6c4;color:var(--green)}.palette button.wrong{background:var(--red-bg);border-color:#e6b5b7;color:var(--red)}.palette-note{font-size:11px;line-height:1.6;color:var(--muted);margin-top:14px}.palette-actions{margin-top:18px}.palette-actions .button{width:100%}.results-heading{display:flex;align-items:center;gap:24px;margin:28px 0}.score{font-family:var(--mono);font-size:68px;font-weight:450;letter-spacing:-5px;line-height:1;color:var(--accent)}.score span{font-size:28px;letter-spacing:-2px}.score-caption{font-size:13px;color:var(--muted);line-height:1.8}.result-top{border-bottom:1px solid var(--line);padding-bottom:28px}.result-actions{display:flex;flex-wrap:wrap;gap:10px}.review-list{margin-top:32px}.review-item{border-bottom:1px solid var(--line)}.review-item summary{list-style:none;display:flex;gap:13px;align-items:flex-start;padding:18px 0;cursor:pointer;min-height:56px;font-size:13px;line-height:1.6}.review-item summary::-webkit-details-marker{display:none}.review-marker{color:var(--green);font-family:var(--mono);flex:none}.review-marker.wrong{color:var(--red)}.review-item .options{margin-bottom:20px}.review-item .explanation{border:0;margin:0}.review-item[open] summary{color:var(--accent)}.review-filter{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0}.filter-button{border:1px solid var(--line);border-radius:6px;padding:8px 13px;font-size:12px;min-height:40px}.filter-button.active{background:var(--tint);color:var(--accent);border-color:#cabfeb}.login{max-width:450px;padding:42px 24px;margin:3svh auto 0}.login .brand{margin-bottom:50px}.login h1{font-size:30px}.login p{color:var(--muted);font-size:14px;margin-top:13px}.login form{margin-top:32px}.login .field{margin-bottom:20px}.login .button{width:100%;margin-top:8px}.login-foot{border-top:1px solid var(--line);margin-top:40px;padding-top:20px;font-size:12px;line-height:1.7;color:var(--muted)}.login-error{background:var(--red-bg);color:var(--red);padding:12px;font-size:13px;border-radius:6px;margin-bottom:18px}.notice{position:fixed;bottom:20px;left:20px;right:20px;z-index:100;background:var(--ink);color:white;padding:16px 20px;border-radius:9px;box-shadow:0 8px 30px #29263422;font-size:13px;line-height:1.6;max-width:660px;margin:auto}.notice.error{background:#7a3038}.notice[hidden]{display:none}.footer-note{font-size:10px;color:#938c9c;line-height:1.6;margin-top:38px}.review-item .question-meta{margin-bottom:12px}.inline-code{font-family:var(--mono);font-size:.91em;overflow-wrap:anywhere}.demo-note{background:var(--tint);color:var(--accent);padding:9px 20px;font-size:12px;text-align:center}
@media(min-width:600px){.main{padding:38px 32px 65px}.daily-workspace{padding:30px;display:grid;grid-template-columns:1.05fr 1fr;gap:35px}.workspace-side{border-top:0;border-left:1px solid var(--line);padding:3px 0 0 28px;margin:0;display:flex;flex-direction:column;justify-content:center}.daily-workspace .button{min-width:220px}.daily-number{margin-top:28px}.daily-breakdown{margin-bottom:28px}.domain-row{grid-template-columns:35px 1fr auto;padding:18px 4px}.domain-name{font-size:14px}.domain-count{font-size:13px}.exam-strip{padding:30px;justify-content:space-between}.form-row{grid-template-columns:1fr 1fr}.practice-form .button{width:auto;min-width:240px}.exam-preview{padding:35px}.exam-facts{gap:65px}.stats-row{gap:30px}.stat strong{font-size:35px}.stat span{font-size:12px}.palette{grid-template-columns:repeat(12,1fr)}.login{margin-top:8svh}.login h1{font-size:32px}.review-item summary{font-size:14px}.history{font-size:13px}.history td,.history th{padding:15px 10px}}
@media(min-width:1000px){.shell{display:grid;grid-template-columns:214px minmax(0,1fr)}.sidebar{border-bottom:0;border-right:1px solid var(--line);height:100svh;display:flex;flex-direction:column;padding:23px 16px;top:0}.brand-line{padding:12px 8px 37px}.brand strong{font-size:22px}.brand img{width:35px;height:35px}.mobile-logout{display:none}.nav{display:flex;flex-direction:column;gap:7px;padding:0}.nav button{display:flex;align-items:center;gap:13px;text-align:left;border:0;border-radius:6px;padding:13px 15px;font-size:13px;min-height:46px}.nav svg{display:block;width:17px;height:17px;opacity:.8}.nav button.active{background:var(--tint);border-color:transparent}.sidebar-bottom{display:block;margin-top:auto;padding:20px 8px 0;border-top:1px solid var(--line);font-size:11px;color:var(--muted)}.sidebar-bottom .user{font-size:11px;overflow-wrap:anywhere;line-height:1.6;margin-bottom:6px}.sidebar-bottom button{font-size:11px;color:var(--muted);padding:0}.sidebar-bottom .version{font-size:10px;letter-spacing:.4px;margin-top:16px}.main{width:100%;padding:48px 44px 65px}.page-top{margin-bottom:34px}.daily-workspace{gap:35px;margin-bottom:38px}.daily-number{font-size:83px}.workspace-side{padding-left:33px}.study-layout{display:grid;grid-template-columns:minmax(0,1fr) 208px;gap:38px}.palette-wrap{border:0;border-left:1px solid var(--line);padding-left:24px;padding-top:0;margin-top:0;align-self:start;position:sticky;top:30px}.palette{grid-template-columns:repeat(5,1fr)}.palette button{min-height:31px}.palette-wrap summary{cursor:default;padding-top:0;list-style:none}.palette-wrap summary::-webkit-details-marker{display:none}.study-header{margin-top:-17px}.question-actions{margin-top:30px}.exam-strip{margin-top:35px}.domain-name{font-size:15px}.domain-sub{font-size:12px}.footer-note{margin-top:45px}}
@media(min-width:1400px){.main{padding-inline:65px}.study-layout{gap:48px;grid-template-columns:minmax(0,1fr) 225px}.daily-workspace{padding:36px}}
@keyframes appear{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
.question-title{scroll-margin-top:145px}
@media(min-width:1000px){.question-title{scroll-margin-top:30px}}
/* Ordered learning path */
.learning-entry{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:23px 0;margin:28px 0}.learning-entry h2{font-size:18px}.learning-entry p{font-size:13px;color:var(--muted);margin-top:7px}.learning-entry .text-button{margin-top:8px}.learning-next{border-top:3px solid var(--accent);background:var(--surface);padding:24px 22px}.learning-count{font-size:12px;color:var(--muted);margin-bottom:14px}.learning-next h2{font-size:23px}.learning-next>p:not(.eyebrow){font-size:14px;color:var(--muted);margin-top:12px}.learning-next .button{margin-top:23px;width:100%}.learning-level{margin-top:38px}.level-heading{display:flex;align-items:flex-start;gap:15px;margin-bottom:18px}.level-number{background:var(--tint);color:var(--accent);font:16px var(--mono);width:36px;height:36px;display:grid;place-items:center;border-radius:50%;flex:none}.level-heading h2{font-size:19px}.level-heading p{font-size:12px;color:var(--muted);margin-top:5px}.lesson-list{border-top:1px solid var(--line)}.lesson-row{display:flex;align-items:center;text-align:left;gap:15px;width:100%;padding:19px 4px;border-bottom:1px solid var(--line);transition:background .15s;min-height:76px}.lesson-row:hover,.lesson-row.recommended{background:var(--tint)}.lesson-number{font:12px var(--mono);color:var(--muted);flex:none}.lesson-copy{flex:1;min-width:0}.lesson-copy strong{display:block;font-size:14px;font-weight:550;line-height:1.5}.lesson-copy small{display:block;font-size:11px;margin-top:5px}.lesson-row>span:last-child{color:var(--accent)}.lesson-primer{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:25px 0;max-width:800px}.lesson-primer h2{font-size:19px}.lesson-notes{font-size:14px;line-height:1.8;padding-left:20px;margin:18px 0 0}.lesson-notes li{padding-left:5px;margin-bottom:15px}.lesson-notes li:last-child{margin-bottom:0}.lesson-start{margin-top:25px}.lesson-start>p:first-child{font-size:12px;color:var(--muted);margin-bottom:20px}.lesson-reminder{border-bottom:1px solid var(--line);margin-bottom:24px;padding-bottom:8px}.lesson-reminder summary{padding:8px 0;min-height:44px;font-size:12px;color:var(--accent);cursor:pointer}.lesson-reminder .lesson-notes{font-size:13px;margin-bottom:18px}
@media(max-width:999px){.nav{grid-template-columns:repeat(5,minmax(72px,1fr));overflow-x:auto;scrollbar-width:thin}.nav button{padding-inline:3px;font-size:11px}.study-header .text-button{text-align:left;line-height:1.5}}
@media(min-width:600px){.learning-next{padding:30px}.learning-next .button{width:auto}.learning-entry{display:flex;align-items:center;justify-content:space-between;gap:25px}.learning-entry .text-button{flex:none;margin:0}.lesson-primer{padding-block:30px}.lesson-row{padding-inline:12px}}