@charset "UTF-8";
:root{--ink:#183333;--muted:#607270;--green:#246556;--mint:#dceee5;--line:#dce3de;--paper:#f6f7f2;--warm:#f0e8db;--white:#fff;--error:#9f3a2b;font-family:"Malgun Gothic","Apple SD Gothic Neo",system-ui,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0;line-height:1.7;font-size:15px}button,input,select,textarea{font:inherit}button,a,label,input,summary{touch-action:manipulation}button{cursor:pointer;border:1px solid var(--line);border-radius:8px;padding:9px 15px;background:white;color:var(--ink)}button:hover{border-color:var(--green);background:#f1f7f2}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #c5802b;outline-offset:3px}a{color:var(--green)}button:disabled{opacity:.5;cursor:default}h1,h2,h3,p{margin-top:0}h2{font-size:25px;line-height:1.5;letter-spacing:-1px}h3{font-size:18px}p{margin-bottom:16px}.skip{position:fixed;top:-100px;left:20px;background:#fff;padding:12px;z-index:10}.skip:focus{top:10px}
.sidebar{position:fixed;inset:0 auto 0 0;width:270px;background:#152d2b;color:#edf4ed;padding:31px 24px;display:flex;flex-direction:column;overflow-y:auto}.brand{display:flex;gap:13px;align-items:center;color:#f1f6ee;text-decoration:none;font-size:27px;font-weight:700;line-height:1.2}.brand-mark{border:1px solid #759184;border-radius:11px;width:43px;height:43px;text-align:center;font-family:Georgia,serif;font-size:38px;position:relative}.brand-mark span{font-size:14px;position:absolute;right:1px;top:0;color:#c5e5a9}.brand-sub{display:block;font-size:8px;letter-spacing:1.8px;font-weight:400;margin-top:7px}.side-intro{margin:48px 0 28px}.eyebrow{font-size:10px;font-weight:700;letter-spacing:1.8px;color:#99bdb0}.side-intro h1{font-size:28px;margin:9px 0 8px;letter-spacing:-1px}.side-intro p{font-size:13px;color:#b9cbc2;line-height:1.9}.day{display:flex;align-items:center;width:100%;gap:12px;text-align:left;border:0;background:transparent;color:#bdcec7;margin:8px 0;padding:13px 10px}.day:hover{background:#29443d;color:white}.day.active{background:#e1eedf;color:#153d2f}.day-num{font-family:monospace;font-size:16px;border:1px solid #49635a;border-radius:50%;width:32px;height:32px;display:grid;place-items:center;flex-shrink:0}.day.active .day-num{border-color:#95b39c}.day small{display:block;font-size:10px;letter-spacing:1px;opacity:.75}.day strong{font-size:13px;display:block}.day .tick{margin-left:auto;font-size:13px}.journey{margin-top:30px;border-top:1px solid #365149;padding-top:24px}.journey>div{display:flex;justify-content:space-between;font-size:12px}.journey p{font-size:11px;color:#afc1b6;margin-top:12px}.journey progress{width:100%;height:5px;display:block;margin-top:14px;accent-color:#bbd89d;border:0;border-radius:4px}.side-footer{font-size:10px;color:#b9c8bf;margin-top:auto;padding-top:25px}.side-footer>span:last-child{display:block;font-size:9px;margin-top:4px;color:#92aaa0}.dot{display:inline-block;width:6px;height:6px;background:#a9d598;border-radius:50%;margin-right:6px}
.workspace{margin-left:270px;min-height:100vh;display:flex;flex-direction:column}.topbar{padding:19px 40px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px;background:#fafbf7}.breadcrumb{font-size:12px;color:var(--muted)}.breadcrumb span{padding:0 14px;color:#acb7ad}.breadcrumb strong{color:var(--ink)}.topbar nav{display:flex;gap:6px;align-items:center}.topbar button,.import-label{border:0;background:transparent;font-size:12px;padding:7px 10px;cursor:pointer;color:var(--ink)}.import-label{position:relative;border-radius:8px}.import-label input{position:absolute;opacity:0;width:100%;height:100%;inset:0;cursor:pointer}.import-label:focus-within{outline:3px solid #c5802b}.topbar button:hover,.import-label:hover{background:#e8eee4}#main{max-width:1220px;width:100%;margin:0 auto;padding:38px 44px 45px;flex:1}.hero{display:flex;justify-content:space-between;align-items:center;gap:30px}.hero .eyebrow{color:var(--green);font-size:11px}.hero h2{font-size:35px;margin:10px 0 12px;font-weight:750;letter-spacing:-1.8px}.hero p{font-size:14px;color:var(--muted);max-width:660px;margin:0}.hero-art{width:138px;height:122px;position:relative;flex-shrink:0;display:grid;place-items:center;background:linear-gradient(140deg,#e5eddb,#dce9e4);border-radius:50% 45% 50% 40%;transform:rotate(-6deg)}.terminal-art{background:#234238;color:#bce3bb;width:97px;padding:15px 12px;border-radius:8px;font:13px/1.7 monospace;box-shadow:7px 8px 0 #bdd0b3;transform:rotate(6deg)}.terminal-art small{color:#94b4a2}.facts{display:flex;gap:12px;margin:27px 0}.fact{font-size:12px;display:flex;gap:7px;align-items:center;background:white;border:1px solid var(--line);padding:7px 12px;border-radius:6px}.fact b{font-weight:600}.welcome{background:#eaf0e3;border:1px solid #dbe4ce;padding:15px 20px;border-radius:10px;font-size:13px;margin:20px 0}.welcome strong{margin-right:10px}.tabs{display:flex;gap:24px;border-bottom:1px solid var(--line);margin:28px 0 26px;overflow-x:auto}.tabs button{border:0;border-radius:0;white-space:nowrap;background:transparent;padding:12px 1px;font-size:13px;color:var(--muted);border-bottom:3px solid transparent}.tabs button.active{color:var(--green);border-bottom-color:var(--green);font-weight:700}.panel{background:white;border:1px solid var(--line);border-radius:13px;padding:30px}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 218px;gap:24px}.prose{max-width:780px;color:#344b48;font-size:14px;line-height:1.95}.prose h2{font-size:24px;margin-bottom:22px;color:var(--ink)}.prose h3{font-size:17px;margin:28px 0 10px;color:var(--ink)}.prose p{white-space:pre-line;overflow-wrap:anywhere}.prose ol{padding-left:24px}.prose li{padding:5px}.side-card{background:#eff2e8;border-radius:12px;padding:22px;height:fit-content;font-size:12px;color:#576b61}.side-card h3{font-size:14px;color:var(--ink)}.side-card ul{padding-left:17px;line-height:2.1}.side-card .big-num{font-size:34px;color:var(--green);font-family:Georgia,serif}.side-card hr{border:0;border-top:1px solid #d4decd;margin:20px 0}.primary{background:var(--green);border-color:var(--green);color:white;font-weight:600}.primary:hover{background:#174e42;color:white}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:25px}.actions .next{margin-left:auto}.muted{color:var(--muted);font-size:13px}.dataset{white-space:pre;overflow:auto;background:#183530;color:#d6e8dd;padding:22px;border-radius:9px;font:13px/2 Consolas,monospace;max-height:520px}.dataset.md{white-space:pre-wrap}.filter{display:flex;align-items:center;gap:12px;margin:18px 0}.filter input{flex:1;min-width:0;border:1px solid #b8c9bd;border-radius:6px;padding:9px 12px}.question{border:1px solid var(--line);border-radius:10px;padding:22px;margin:20px 0;min-width:0}.question legend{font-weight:700;padding:0 7px;font-size:14px}.option{display:flex;gap:10px;align-items:baseline;padding:11px 14px;margin:7px 0;background:#f6f8f3;border-radius:6px;font-size:14px;cursor:pointer}.option:has(input:checked){background:#e0ede2;box-shadow:inset 0 0 0 1px #6f9981}input[type=radio],input[type=checkbox]{accent-color:var(--green)}details{font-size:13px;margin-top:14px}summary{cursor:pointer;color:var(--green);font-weight:600}details p{padding:12px 0 0;margin-bottom:5px}.feedback{border-left:3px solid #397757;background:#edf5ed;padding:12px 15px;margin-top:15px;font-size:13px}.feedback.wrong{background:#fff3e8;border-color:#b37a36}.score{background:#e8f0e4;padding:20px;border-radius:10px;margin:20px 0}.score strong{font-size:27px;margin-right:12px}.artifact{margin-top:35px;border-top:1px solid var(--line);padding-top:30px}.artifact textarea{width:100%;min-height:245px;resize:vertical;border:1px solid #b0c0b4;padding:16px;border-radius:8px;line-height:1.85;font-size:14px}.check{display:flex;align-items:baseline;gap:10px;font-size:13px;padding:6px 0}.counter{font-size:12px;color:var(--muted);text-align:right}.completion{padding:12px 16px;background:#eff4eb;font-size:13px;border-radius:8px;margin-top:18px}.interest{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;padding:17px 0;border-bottom:1px solid var(--line)}.interest select{border:1px solid #acbfae;border-radius:6px;padding:7px;background:white}.tracks{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:24px 0}.track{background:#f0f4eb;border:1px solid #d5dfce;border-radius:10px;padding:20px}.track h3{font-size:16px}.track .index{font-size:29px;font-family:Georgia,serif}.track p{font-size:12px;margin:12px 0}.track progress{width:100%;accent-color:var(--green);height:6px}.source{padding:20px 0;border-bottom:1px solid var(--line)}.source h3{margin-bottom:6px;font-size:16px}.source p{font-size:13px;margin:6px 0}.source a{overflow-wrap:anywhere}.page-footer{display:flex;justify-content:space-between;padding:20px 44px;border-top:1px solid var(--line);font-size:10px;letter-spacing:.4px;color:var(--muted)}#notice:empty{display:none}#notice{padding:12px 40px;background:#fff0d5;font-size:13px;color:#6b4520}dialog{max-width:520px;width:90%;border:1px solid var(--line);border-radius:14px;padding:28px;box-shadow:0 15px 60px #0003}dialog::backdrop{background:#102b2b66}dialog button{margin:4px}.loading{padding:60px;text-align:center}
@media(min-width:1500px){#main{padding-top:48px}.hero h2{font-size:39px}}
@media(max-width:1100px){.sidebar{width:230px;padding:26px 18px}.workspace{margin-left:230px}#main{padding:28px}.topbar{padding:18px 24px}.lesson-layout{grid-template-columns:1fr}.side-card{display:none}.hero h2{font-size:29px}.hero-art{width:105px;height:100px}.tracks{grid-template-columns:1fr}}
@media(max-width:740px){.sidebar{position:static;width:100%;padding:17px 18px}.brand{font-size:22px}.brand-sub{font-size:7px}.brand-mark{height:36px;width:36px;font-size:30px}.side-intro,.journey,.side-footer{display:none}#days{display:flex;gap:6px;overflow-x:auto;margin-top:12px}.day{min-width:143px;width:auto;padding:8px;margin:0}.day strong{font-size:11px}.day-num{width:25px;height:25px;font-size:12px}.day small{font-size:8px}.workspace{margin-left:0}.topbar{padding:11px 16px;flex-wrap:wrap}.topbar nav{gap:0}.topbar button,.import-label{font-size:11px;padding:6px 9px}#main{padding:25px 17px}.hero h2{font-size:27px;letter-spacing:-1px}.hero-art{display:none}.hero p{font-size:13px}.facts{gap:6px;flex-wrap:wrap}.fact{font-size:10px;padding:6px 8px}.tabs{gap:20px;margin:22px 0 18px}.panel{padding:21px 17px}.question{padding:16px 10px}.option{font-size:13px}.page-footer{padding:18px;font-size:9px;gap:10px}.welcome{padding:14px;font-size:12px}.welcome strong{display:block}.prose{font-size:14px}.prose h2{font-size:22px}.actions .next{margin-left:0}}
@media print{.sidebar,.topbar,.tabs,.actions,.page-footer,#notice{display:none}.workspace{margin:0}.panel{border:0}.hero-art{display:none}#main{padding:0;max-width:none}.dataset{white-space:pre-wrap;color:black;background:white}.lesson-layout{display:block}.side-card{display:none}}