:root{font-family:"Segoe UI","Malgun Gothic",sans-serif;color:#23332f;background:#f5f6f3;font-synthesis:none;--green:#1c6456;--muted:#7c8781;--line:#e5e9e3}*{box-sizing:border-box}body{margin:0;display:flex}button,a,input{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #d89d42;outline-offset:4px}[hidden]{display:none!important}.sidebar{width:236px;position:fixed;inset:0 auto 0 0;background:#fcfcfa;border-right:1px solid var(--line);padding:35px 23px;display:flex;flex-direction:column}.brand{text-decoration:none;color:#23332f;display:flex;gap:10px;align-items:center;font-size:19px;font-weight:700;letter-spacing:-1px}.brand-icon{background:var(--green);color:white;border-radius:10px;font-size:26px;padding:2px 10px 6px;letter-spacing:-2px}.brand-dot{color:#98aaa0;font-weight:400}.workspace{font-size:10px;letter-spacing:1.5px;color:#8b958e;margin:48px 10px 18px}.nav-item{display:flex;align-items:center;gap:13px;width:100%;border:0;background:none;text-align:left;color:#6c7971;padding:14px 13px;border-radius:8px;margin:5px 0;font-size:13px}.nav-item span{font-size:20px;width:21px}.nav-item.active{background:#eaf0e9;color:#295c4d;font-weight:700}.sidebar-note{margin-top:auto;padding:20px 12px 45px}.tiny-label{font-size:10px;color:#89958a}.sidebar-note p{font-size:18px;line-height:1.8;color:#53684e;font-weight:600}.note-line{width:28px;height:2px;background:#c7d2bd;margin:20px 0}.sidebar-note>span{font-size:10px;color:#8a958d}.profile{display:flex;align-items:center;gap:11px;border-top:1px solid var(--line);padding-top:24px}.avatar{background:#e9e7df;border-radius:50%;width:35px;height:35px;display:grid;place-items:center;font-size:12px}.profile strong{font-size:12px;display:block}.profile small{font-size:10px;color:var(--muted);display:block;margin-top:5px}main{margin-left:236px;width:calc(100% - 236px);padding:0 44px;max-width:1720px}.topbar{height:79px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);font-size:11px;color:#7d8780}.topbar strong{font-weight:500;color:#34463a}.crumb{padding:0 13px;color:#b7bfb7}.prototype{font-size:10px;border:1px solid #dfe5d9;border-radius:20px;padding:7px 12px;color:#617154}i{display:inline-block;width:6px;height:6px;border-radius:50%;background:#80a378;margin-right:6px}.page-heading{display:flex;align-items:center;justify-content:space-between;padding:35px 0 27px}.eyebrow{font-size:10px;color:#729175;font-weight:700;letter-spacing:1.8px}h1{font-size:29px;letter-spacing:-1.1px;margin:10px 0 10px;font-weight:650}.page-heading p{font-size:12px;color:var(--muted);margin:0}.session-label{font-size:11px;letter-spacing:1px;color:#7d8a78;text-align:right}.session-label span{display:block;font-size:11px;letter-spacing:0;margin-top:8px;color:#8a9488}.stats{display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px 0;margin-bottom:25px}.stats>div{padding:0 27px;border-right:1px solid var(--line);position:relative}.stats>div:last-child{border:0}.stats div>span{display:block;font-size:11px;color:#7b887e;margin-bottom:10px}.stats strong{font-size:26px;letter-spacing:-1px;font-weight:600}.stats small{font-size:11px;color:#909c92;margin-left:6px}progress{display:block;width:100%;height:4px;appearance:none;border:0;background:#edf0e9;margin-top:8px;border-radius:5px;overflow:hidden}progress::-webkit-progress-bar{background:#edf0e9}progress::-webkit-progress-value{background:#63967d}progress::-moz-progress-bar{background:#63967d}.study-layout{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(280px,1fr);gap:22px;align-items:stretch}.question-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:26px 30px 0}.card-top{display:flex;justify-content:space-between;color:#87928a;font-size:11px}.section-label{letter-spacing:1.7px;font-size:10px;font-weight:700}.question-meta{display:flex;align-items:center;gap:10px;font-size:10px;color:#7b887e;margin-top:25px}.chip{background:#edf2e9;padding:5px 9px;border-radius:5px;color:#4e7054}.question-number{font-size:12px;color:#728277;margin-top:23px}.question-card h2{font-family:Georgia,serif;font-size:24px;line-height:1.6;font-weight:400;margin:10px 0 25px;min-height:78px}fieldset{border:0;padding:0;margin:0;display:grid;gap:9px}.option{display:flex;align-items:center;gap:13px;border:1px solid #e4e9e2;border-radius:7px;padding:13px 14px;cursor:pointer;font-size:13px;transition:background .15s}.option:hover{background:#f8faf6}.option:has(input:checked){border-color:#548b73;background:#f0f6ee}.option input{accent-color:var(--green);margin:0}.option-letter{font-size:11px;color:#8b978d}.option.correct{background:#edf6ef;border-color:#78a685}.option.incorrect{background:#fcf1ec;border-color:#ca8a70}.question-actions{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:24px 0}.question-actions>span{font-size:10px;color:#8b968e}.primary{border:0;border-radius:6px;background:var(--green);color:white;font-size:12px;padding:12px 19px;white-space:nowrap}.primary span{margin-left:15px}.question-footer{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding:15px 0;font-size:9px;color:#a0a99e}.text-button{border:0;background:none;font-size:10px;color:#738578;padding:6px}.feedback{margin-top:16px;border-radius:6px;padding:13px;font-size:12px;line-height:1.7;background:#edf6ef;color:#356045}.feedback.wrong{background:#faf1e9;color:#986344}.tutor-card{border:1px solid #dce4d8;border-radius:12px;background:#f9fbf7;display:flex;flex-direction:column;overflow:hidden}.tutor-header{display:flex;gap:11px;align-items:center;padding:22px;border-bottom:1px solid #e6ece1}.tutor-avatar{height:36px;width:36px;background:#e5eddd;color:#59744c;display:grid;place-items:center;border-radius:10px;font-size:23px}.tutor-header h2{margin:0 0 5px;font-size:14px}.tutor-header div>span{font-size:9px;color:#7c8b70}.mini-pill{margin-left:auto;font-size:8px;letter-spacing:1px;border:1px solid #dfe7d8;padding:4px 6px;border-radius:4px;color:#829178}.tutor-context{margin:20px 22px 0;border-left:2px solid #a9bd95;padding-left:10px}.tutor-context span{display:block;font-size:9px;color:#8c9a83}.tutor-context strong{display:block;margin-top:6px;font-size:12px;font-weight:500}.messages{padding:20px 22px;flex:1;max-height:330px;min-height:200px;overflow:auto}.message{font-size:12px;line-height:1.9;white-space:pre-wrap;padding:16px;border:1px solid #e7ecdf;background:#fff;border-radius:0 11px 11px 11px;margin-bottom:12px}.message-label{display:block;font-size:9px;letter-spacing:1px;font-weight:600;color:#7e9070;margin-bottom:8px}.tutor-actions{display:flex;gap:8px;padding:0 22px;flex-wrap:wrap}.tutor-actions button{background:white;border:1px solid #d9e3cf;color:#60754d;font-size:10px;padding:10px 12px;border-radius:6px}.tutor-disclaimer{font-size:9px;color:#929d8b;text-align:center;line-height:1.8;margin:18px 15px}.bottom-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:24px}.panel{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px}.panel-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px;gap:10px}.panel-heading h2{font-size:13px;margin:0}.panel-heading>span{font-size:9px;color:#98a18f}.panel-heading .green-text{color:#668459}.concept-row{display:grid;grid-template-columns:65px 1fr 60px;align-items:center;gap:12px;margin:17px 0;font-size:11px}.concept-row progress{margin:0;height:5px}.concept-row>span:last-child{text-align:right;color:#7c8a78;font-size:10px}.recommendation{width:100%;display:flex;align-items:center;gap:12px;text-align:left;background:none;border:0;border-bottom:1px solid #edf0e9;padding:12px 0}.recommendation:last-child{border:0}.rec-number{display:grid;place-items:center;width:30px;height:32px;background:#f1f3ec;border-radius:5px;color:#80916e;font-size:10px}.rec-body{flex:1}.rec-body strong{display:block;font-size:11px;font-weight:500}.rec-body small{display:block;color:#8c9686;font-size:9px;margin-top:5px}.rec-arrow{color:#94a38a}.footnote{font-size:9px;line-height:1.8;margin:16px 0 0}.muted{color:#99a091}.page-footer{display:flex;justify-content:space-between;padding:26px 0;color:#a0aa9c;letter-spacing:1.4px;font-size:8px}.page-footer span{letter-spacing:0}.notice{padding:14px;background:#fff0e8;color:#9c4d2d;font-size:12px;border-radius:8px;margin-bottom:16px}.history-row{display:grid;grid-template-columns:1fr 1fr 1fr 1.4fr;padding:14px 0;border-bottom:1px solid var(--line);font-size:12px;gap:10px}.history-row .good{color:#41805b}.history-row .bad{color:#ae6f50}.empty{font-size:13px;color:var(--muted);padding:24px 0}.sr-only{position:absolute;clip:rect(0,0,0,0);width:1px;height:1px;overflow:hidden}@media(min-width:1600px){main{padding:0 65px}.question-card{padding:30px 40px 0}.question-card h2{font-size:28px}}@media(max-width:1150px){.sidebar{width:190px;padding:30px 16px}main{margin-left:190px;width:calc(100% - 190px);padding:0 25px}.brand{font-size:16px}.study-layout{grid-template-columns:minmax(0,1.3fr) minmax(260px,1fr)}.question-card{padding:23px 22px 0}.question-actions>span{max-width:120px;line-height:1.7}.stats>div{padding:0 20px}}@media(max-width:900px){.sidebar{width:72px;padding:25px 12px}.brand>span:last-child,.workspace,.sidebar-note,.profile,.nav-item{font-size:0}.nav-item{justify-content:center;padding:12px}.nav-item span{font-size:22px}.sidebar nav{margin-top:35px}main{margin-left:72px;width:calc(100% - 72px);padding:0 20px}.study-layout{grid-template-columns:1fr}.messages{min-height:100px;max-height:240px}.bottom-grid{grid-template-columns:1fr 1fr}}@media(max-width:580px){.sidebar{position:static;width:100%;height:auto;padding:16px;flex-direction:row;align-items:center;justify-content:space-between;border-right:0;border-bottom:1px solid var(--line)}.sidebar nav{margin:0;display:flex;gap:5px}.nav-item{margin:0;width:40px}.brand-icon{font-size:23px}body{display:block}main{margin:0;width:100%;padding:0 16px}.topbar{height:54px;font-size:9px}.crumb{padding:0 6px}.prototype{font-size:8px;padding:5px 7px}.page-heading{padding:26px 0 22px}.session-label{display:none}h1{font-size:25px}.page-heading p{font-size:11px;line-height:1.7}.stats{padding:17px 0}.stats>div{padding:0 10px}.stats div>span{font-size:9px}.stats strong{font-size:22px}.stats small{font-size:9px}.bottom-grid{grid-template-columns:1fr}.question-card h2{font-size:23px}.page-footer{line-height:1.7;gap:20px}.history-row{font-size:10px}.question-footer{font-size:8px}.question-card{padding:22px 20px 0}}
@media(max-width:900px){.sidebar .brand>span:last-child,.sidebar .workspace,.sidebar .sidebar-note,.sidebar .profile{display:none}}