:root{--ink:#19303d;--muted:#72818c;--line:#e2e8e9;--paper:#f7f8f5;--teal:#087d79;--teal-light:#e4f3ed;--nav:#fff;--mono:ui-monospace,SFMono-Regular,Consolas,monospace}*{box-sizing:border-box}body{margin:0;font-family:Inter,Pretendard,'Noto Sans CJK KR',-apple-system,BlinkMacSystemFont,sans-serif;color:var(--ink);background:var(--paper);font-size:14px;line-height:1.65}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}a{color:inherit;text-decoration:none}button{cursor:pointer}button:disabled{opacity:.55;cursor:wait}:focus-visible{outline:3px solid #46a6a5;outline-offset:3px}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.45;word-break:keep-all}h1{font-size:38px;letter-spacing:-1.5px;margin-bottom:16px}h2{font-size:21px;letter-spacing:-.5px}h3{font-size:17px}p{word-break:keep-all;overflow-wrap:anywhere}.muted,.micro{color:var(--muted)}.micro{font-size:12px}.eyebrow{display:block;font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:1.7px;color:var(--teal);margin-bottom:14px}.hidden{display:none!important}.preserve{white-space:pre-wrap}.sidebar{position:fixed;inset:0 auto 0 0;width:244px;background:var(--nav);border-right:1px solid var(--line);padding:30px 21px 20px;display:flex;flex-direction:column;z-index:30}.brand{display:flex;align-items:center;gap:10px;font-size:19px;letter-spacing:-.5px;font-weight:800;line-height:1.3}.brand small{display:block;font-size:10px;font-weight:400;color:var(--muted);letter-spacing:.2px;margin-top:5px}.brand-light{font-weight:400}.brand-mark{position:relative;display:grid;place-items:center;width:37px;height:37px;background:var(--ink);color:white;border-radius:10px;font-family:var(--mono);font-size:26px}.brand-mark span{position:absolute;font-size:15px;color:#8bc8b5;right:0;top:-5px}.course-tag{margin:32px 0 22px;padding:11px 9px;background:#f2f5f2;border-radius:6px;font-size:12px;color:#50646d;display:flex;justify-content:space-between;gap:3px}.course-tag span{font-family:var(--mono);font-size:9px;letter-spacing:.7px}.side-progress{margin-bottom:24px}.side-progress>div{display:flex;justify-content:space-between;font-size:11px;margin-bottom:10px}.side-progress strong{font-weight:500}.side-progress span{color:var(--teal);font-family:var(--mono)}progress{appearance:none;height:5px;width:100%;border:0;border-radius:20px;background:#e7ece8;overflow:hidden}progress::-webkit-progress-bar{background:#e7ece8}progress::-webkit-progress-value{background:var(--teal)}progress::-moz-progress-bar{background:var(--teal)}.side-home{font-size:13px;padding:12px 10px;background:#edf3ef;border-radius:6px;font-weight:600}.lesson-nav{overflow-y:auto;flex:1;padding-bottom:12px}.week-label{font:10px var(--mono);letter-spacing:1.4px;color:#93a09f;margin:25px 9px 8px}.lesson-nav>a,.nav-locked{display:flex;align-items:center;gap:9px;padding:10px 8px;font-size:12px;border-radius:6px;min-height:41px}.lesson-nav>a:hover{background:#f4f7f4}.lesson-nav>a.active{background:var(--teal-light);color:var(--teal);font-weight:600}.step-number{width:22px;height:22px;display:grid;place-items:center;flex-shrink:0;border:1px solid #e0e6e4;border-radius:5px;font:10px var(--mono);color:#8e9c9a}.active .step-number,.step-number.done{background:var(--teal);color:white;border-color:var(--teal)}.nav-locked{color:#a9b2b2}.lock{font-size:9px;margin-left:auto}.side-bottom{border-top:1px solid var(--line);padding-top:16px}.side-bottom>a{font-size:12px;display:block;margin-bottom:15px;color:var(--teal)}.profile{display:flex;align-items:center;gap:10px}.avatar{display:grid;place-items:center;background:#e9efe7;border-radius:50%;width:32px;height:32px;font-size:13px;font-weight:600}.profile strong{font-size:12px;display:block}.profile small{font-size:10px;color:var(--muted)}.profile form{margin-left:auto}.text-button{border:0;background:none;padding:8px 0;font-size:10px;color:var(--muted)}.main{margin-left:244px;padding:25px 48px 50px;max-width:1570px}.topline{display:flex;justify-content:space-between;align-items:center;gap:20px;color:#84918f;font:10px var(--mono);letter-spacing:.7px;margin:0 0 33px;min-height:20px}.top-status{display:flex;align-items:center;gap:6px;font:11px sans-serif;letter-spacing:0}.top-status i{width:6px;height:6px;border-radius:50%;background:#4c9e83}.hero{display:flex;align-items:center;justify-content:space-between;gap:35px;background:#eaf0e8;border:1px solid #e0e7dd;border-radius:13px;padding:35px 38px;margin-bottom:40px}.hero p{color:#65776f;line-height:1.9}.hero-tags{display:flex;gap:7px;flex-wrap:wrap;margin-top:22px}.hero-tags span{font-size:10px;border:1px solid #d6e0d2;padding:4px 9px;border-radius:4px;color:#587161;background:#f1f5ee}.hero-progress{flex:0 0 155px;border-left:1px solid #d7e1d5;padding-left:30px;display:flex;flex-direction:column;align-items:flex-start}.progress-large{font:68px/1.2 var(--mono);letter-spacing:-5px;color:var(--teal)}.progress-large small{font-size:25px;letter-spacing:-1px;color:#899a8d;margin-left:9px}.hero-progress strong{font-size:12px;margin:2px 0 16px;font-weight:500}.hero-progress>span:last-child{font-size:10px;color:#6b7f72;margin-top:9px}.section-head{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:24px}.section-head h2{margin:0}.section-head p{margin:0;font-size:11px;color:var(--muted)}.week-section{margin-bottom:30px}.week-title{display:flex;gap:15px;align-items:center;margin-bottom:13px}.week-title>span{font:10px var(--mono);letter-spacing:1.2px;color:var(--teal);white-space:nowrap}.week-title h3{font-size:13px;margin:0;font-weight:500;color:#748078}.lesson-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}.lesson-card{min-width:0;background:white;border:1px solid var(--line);border-radius:10px;padding:22px 24px 0;transition:transform .15s,border-color .15s}.lesson-card:not(.locked):hover{border-color:#8fbab0;transform:translateY(-2px)}.card-top{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:24px}.lesson-index{font:10px var(--mono);letter-spacing:1px;color:#82918c}.badge{display:inline-block;border-radius:4px;background:#f1f3f1;color:#8e9891;padding:3px 7px;font-size:10px;white-space:nowrap}.badge.ready{color:#267d67;background:#e5f3e9}.badge.complete{color:#54748e;background:#e6eef5}.lesson-card h3{font-size:20px;letter-spacing:-.5px;margin-bottom:9px}.lesson-card>p{font-size:12px;color:#7e8c86;margin-bottom:23px;min-height:20px}.card-meta{display:flex;gap:15px;color:#89958f;font-size:10px;margin-bottom:19px}.card-action{border-top:1px solid #edf0ec;display:flex;justify-content:space-between;align-items:center;padding:14px 0;font-size:12px;color:var(--teal);font-weight:500}.card-action span{font-size:19px}.locked{background:#f5f6f3;border-color:#e5e9e2}.locked h3{color:#8d9892}.card-action.disabled{color:#9da69d}.card-action.disabled span{font-size:12px}.page-footer{text-align:center;font-size:11px;color:#9aa39c;margin:35px 0 0}.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:6px;min-height:40px;padding:9px 16px;font-size:12px;font-weight:600;white-space:nowrap}.primary{background:var(--teal);color:white}.primary:hover{background:#066c69}.secondary{background:white;border-color:#d8e1dd;color:#456057}.secondary:hover{background:#f0f6f1}.small{min-height:32px;padding:6px 10px;font-size:11px}.wide{width:100%}.lesson-heading{margin:0 0 28px}.lesson-heading h1{font-size:34px}.lesson-heading>p{font-size:16px;color:#718279}.lesson-tabs{display:flex;gap:22px;border-bottom:1px solid #d9e2dc;margin-bottom:26px;overflow-x:auto}.lesson-tabs button{background:none;border:0;border-bottom:3px solid transparent;color:#8a978d;padding:13px 0 16px;font-size:12px;font-weight:500;white-space:nowrap}.lesson-tabs button[aria-selected=true]{color:var(--teal);border-bottom-color:var(--teal);font-weight:700}.reading-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:30px}.reading-content{background:white;border:1px solid var(--line);border-radius:10px;padding:30px}.reading-content>section{margin-bottom:30px}.reading-content>section:last-child{margin:0}.reading-content h2{font-size:18px;margin-bottom:13px}.reading-content p{font-size:13px;line-height:2.05;color:#53665c}.worked-example{background:#f0f5ed;border-radius:6px;padding:22px}.sticky-card{position:sticky;top:25px;background:white;border:1px solid var(--line);border-radius:10px;padding:23px}.sticky-card>p{font-size:12px;color:#7a897f;line-height:1.9}.sticky-card .button{margin-top:12px;white-space:normal}.sticky-card .micro{margin:16px 0 0;font-size:10px}.reading-content details{padding:13px 0;border-bottom:1px solid var(--line);font-size:12px}.reading-content summary{cursor:pointer}.practice-toolbar{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:18px}.practice-toolbar h2{margin-bottom:4px}.practice-toolbar p{margin:0;font-size:12px}.toolbar-actions{display:flex;gap:8px;align-items:center}.execution-notice{font-size:11px;color:#6d8276;padding:11px 15px;background:#edf3e9;border:1px solid #e0e8da;border-radius:5px;margin-bottom:20px}.cell{margin-bottom:22px;min-width:0}.cell-header{display:flex;justify-content:space-between;align-items:center;font:11px var(--mono);color:#648074;margin-bottom:9px}.cell-editor{display:block;resize:vertical;width:100%;min-height:100px;border:1px solid #203542;border-radius:8px;background:#162b38;color:#dce9e1;padding:20px;font:12px/1.8 var(--mono);white-space:pre;tab-size:4;overflow:auto}.cell-output{background:white;border:1px solid var(--line);border-radius:0 0 7px 7px;padding:16px;margin-top:0;overflow:hidden}.cell-output pre{margin:0;font:11px/1.65 var(--mono);overflow:auto;max-height:380px;white-space:pre}.cell-output img{display:block;max-width:100%;height:auto;margin:12px auto}.cell-error{color:#aa4747}.downloads{display:flex;gap:20px;flex-wrap:wrap;margin:20px 0;font-size:12px;color:var(--teal)}.reflection-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:22px;align-items:start}.white-panel{background:white;border:1px solid var(--line);border-radius:10px;padding:27px;margin-bottom:22px;min-width:0}.white-panel h2{font-size:20px;margin-bottom:10px}.white-panel p.muted{font-size:12px}.prompt-block{border-top:1px solid var(--line);padding:16px 0;font-size:12px}.prompt-block summary{cursor:pointer;font-weight:600}.prompt-block pre,details>pre{white-space:pre-wrap;word-break:break-word;font:11px/1.8 var(--mono);background:#f3f6f1;padding:14px;border-radius:5px}label{display:block;font-size:12px;font-weight:500;margin-bottom:17px}label>input:not([type=radio]),textarea,select{display:block;width:100%;border:1px solid #d7dfd8;border-radius:5px;padding:11px 12px;background:#fff;color:var(--ink);margin-top:7px;max-width:100%}textarea{resize:vertical;font-size:12px;font-weight:400;line-height:1.8}select{font-size:12px}input[type=radio]{accent-color:var(--teal)}.completion-panel{background:#e9f0e5;border:1px solid #d7e3d1;border-radius:10px;padding:27px;margin-top:4px}.completion-panel h2{font-size:21px;margin-bottom:9px}.quiz{border:0;margin:23px 0;padding:0}.quiz legend{font-size:14px;font-weight:600;margin-bottom:14px;word-break:keep-all}.quiz label{display:flex;gap:9px;font-size:12px;font-weight:400;margin:10px 0;align-items:baseline}.invite-panel{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:18px}.invite-panel p{margin-bottom:0}#invite-result{width:100%;display:flex;gap:10px;flex-wrap:wrap}#invite-result>input{flex:1;min-width:150px;border:1px solid #b7cec1;border-radius:5px;padding:10px;background:#f3f8f2;font-size:12px}#invite-result>p{width:100%}table{width:100%;border-collapse:collapse;font-size:12px;white-space:nowrap}th{text-align:left;color:#8d9a91;font-weight:500}th,td{padding:15px 12px;border-bottom:1px solid var(--line)}td progress{width:75px;margin-right:10px}td a{color:var(--teal)}.table-scroll{overflow-x:auto}.error-panel{margin-top:50px}.public-error{padding:70px 25px;max-width:700px;margin:auto}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,15px);background:#173b34;color:white;border-radius:8px;padding:12px 20px;font-size:12px;z-index:100;opacity:0;pointer-events:none;transition:.2s;max-width:90vw;box-shadow:0 5px 25px #163b3428}.toast.show{opacity:1;transform:translate(-50%,0)}.toast.error{background:#8e3f3f}.mobile-menu{display:none}.auth-layout{display:grid;grid-template-columns:minmax(0,1fr);min-height:100svh}.auth-story{background:#17372f;color:#e1ede2;padding:40px 50px;display:flex;flex-direction:column}.auth-story .brand{color:white}.auth-story .brand-mark{background:#2c5045}.auth-story .brand small{color:#91ad9c}.auth-story-body{margin:auto 0;padding:55px 0}.auth-story-body .eyebrow{color:#9abfa9}.auth-story-body h1{font-size:51px;letter-spacing:-2px;line-height:1.4;margin:24px 0}.auth-story-body>p{color:#a2baac;line-height:1.95;font-size:14px}.auth-stats{display:flex;gap:45px;margin-top:45px}.auth-stats strong{display:block;font:36px var(--mono);color:#dce9ce}.auth-stats strong span{font-size:15px;margin-left:4px}.auth-stats small{display:block;color:#8caa95;font-size:11px;margin-top:7px}.auth-foot{font:10px var(--mono);letter-spacing:1px;color:#779782;margin:0}.auth-panel{background:#fcfdf9;display:grid;place-items:center;padding:45px}.auth-form-wrap{width:100%;max-width:360px}.auth-form-wrap h2{font-size:27px;letter-spacing:-1px;margin:0 0 14px}.auth-form-wrap>.muted{font-size:12px;margin-bottom:34px}.auth-form label{font-size:12px}.auth-form input{height:47px}.auth-form .button{height:46px;margin-top:8px}.auth-note{margin-top:22px;color:#8d9b90;font-size:11px;text-align:center}.quiet-link{font-size:11px;display:block;text-align:center;color:var(--teal)}.form-error{font-size:12px;background:#f9eae6;padding:12px;border-radius:5px;color:#ac4f3e}
@media(min-width:1600px){.main{margin-right:auto;margin-left:244px;padding-left:65px;padding-right:65px}}@media(max-width:1150px){.main{padding:25px 28px 40px}.reading-layout{grid-template-columns:minmax(0,1fr)}.reading-aside{grid-row:1}.sticky-card{position:static;display:flex;align-items:center;flex-wrap:wrap;gap:8px 20px}.sticky-card .eyebrow,.sticky-card h3,.sticky-card>p:not(.micro){display:none}.sticky-card .button{margin:0;width:auto;flex:1}.sticky-card .micro{width:100%;margin:0}.hero{padding:30px}.hero h1{font-size:33px}.lesson-card{padding:20px 20px 0}.card-top{gap:5px}.card-meta{gap:9px}.auth-story{padding:35px}.auth-story-body h1{font-size:43px}}@media(max-width:850px){.sidebar{width:220px;padding:25px 15px}.main{margin-left:220px;padding:25px 22px}.hero{align-items:flex-start;gap:15px;flex-direction:column}.hero-progress{flex-basis:auto;border-left:0;border-top:1px solid #d7e1d5;width:100%;padding:15px 0 0;display:grid;grid-template-columns:65px 1fr;gap:5px 18px}.progress-large{font-size:40px;grid-row:span 3}.progress-large small{font-size:17px}.hero-progress strong{margin:0}.hero-progress>span:last-child{margin:0}.hero-progress progress{margin-top:4px}.lesson-grid,.reflection-grid{grid-template-columns:minmax(0,1fr)}.section-head p{display:none}.practice-toolbar{align-items:flex-start;flex-direction:column}.toolbar-actions{width:100%}.toolbar-actions>.micro{margin-right:auto}.auth-stats{gap:25px}}@media(max-width:650px){.sidebar{transform:translateX(-100%);transition:.2s;width:244px}.menu-open .sidebar{transform:translateX(0);box-shadow:5px 0 35px #173b3420}.mobile-menu{display:block;position:fixed;top:12px;left:15px;background:white;border:1px solid #d7e1d7;border-radius:6px;padding:9px 13px;font-size:12px;z-index:40}.menu-open .mobile-menu{left:auto;right:12px;min-width:40px}.main{margin-left:0;padding:75px 18px 35px}.topline{margin-bottom:24px;gap:8px}.top-status{font-size:9px}.hero{padding:26px;margin-bottom:30px}.hero h1{font-size:30px}.hero .eyebrow{font-size:9px}.hero p{font-size:13px}.hero-tags span{font-size:9px}.hero-tags{gap:5px}.section-head{margin-bottom:18px}.week-title{gap:10px}.week-title h3{font-size:11px}.lesson-heading h1{font-size:29px}.lesson-heading>p{font-size:13px}.lesson-tabs{gap:18px}.lesson-tabs button{font-size:10px}.reading-content,.white-panel{padding:22px}.reading-content p{font-size:12px;line-height:2}.reading-content h2{font-size:17px}.cell-editor{font-size:11px;padding:14px}.cell-output{padding:12px}.cell-output pre{font-size:10px}.button{font-size:11px;padding:9px 12px}.toolbar-actions{flex-wrap:wrap}.toolbar-actions .micro{width:100%}.completion-panel{padding:22px}.auth-layout{grid-template-columns:1fr}.auth-story{padding:23px 25px}.auth-story-body{padding:25px 0 5px}.auth-story-body h1{font-size:29px;letter-spacing:-1px;margin:10px 0}.auth-story-body h1 br{display:none}.auth-story-body>p{font-size:11px}.auth-stats{display:none}.auth-story .brand{font-size:16px}.auth-story .brand-mark{width:31px;height:31px;font-size:22px}.auth-story .brand small{font-size:9px}.auth-foot{display:none}.auth-story-body .eyebrow{font-size:9px;margin:0}.auth-panel{padding:32px 24px;place-items:center}.auth-form-wrap h2{font-size:24px}.auth-form-wrap>.muted{margin-bottom:24px}.public-error h1{font-size:28px}}