:root{--ink:#18263e;--muted:#586680;--line:#d6dfed;--blue:#3849bc;--light:#eef1ff;--bg:#eef3fa;--gold:#f9be47;--green:#117456;--red:#a93248;font-family:'Malgun Gothic','Apple SD Gothic Neo',system-ui,sans-serif;color:var(--ink);background:var(--bg)}*{box-sizing:border-box}body{margin:0;font-size:16px;line-height:1.7}a{color:var(--blue)}button,input,textarea,select{font:inherit}button,.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:8px;background:white;color:var(--ink);padding:10px 15px;cursor:pointer;text-decoration:none;font-weight:700}button:disabled{opacity:.48;cursor:not-allowed}button:hover:not(:disabled){border-color:var(--blue)}.primary{background:var(--blue);color:white;border-color:var(--blue)}.quiet{padding:6px 9px;font-size:14px;background:transparent}.danger{color:var(--red)}input,textarea,select{display:block;width:100%;border:1px solid #aab9d0;border-radius:8px;background:white;color:var(--ink);padding:10px 12px}textarea{resize:vertical;min-height:110px}label{display:block;font-weight:700;margin:8px 0;font-size:14px}:focus-visible{outline:3px solid #879bfb;outline-offset:3px}header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:18px 4vw;background:#fff;border-bottom:1px solid var(--line)}.brand{font-weight:900;font-size:27px;color:var(--blue);text-decoration:none;display:flex;gap:14px;align-items:center}.brand span{font-size:16px;letter-spacing:1px}nav{display:flex;align-items:center;gap:24px;font-size:14px}nav a{text-decoration:none}main{max-width:1420px;margin:auto;padding:22px 4vw 40px}h1,h2,h3,p{margin-top:0}h1{font-size:34px;line-height:1.4;letter-spacing:-1.3px;margin-bottom:12px}h2{font-size:22px;line-height:1.45;margin-bottom:12px}h3{font-size:17px;margin-bottom:8px}.eyebrow{color:var(--blue);font-size:12px;letter-spacing:1.5px;font-weight:800;margin-bottom:12px}.muted{color:var(--muted)}.small{font-size:14px}.panel{border:1px solid var(--line);border-radius:14px;background:white;padding:24px}.join{display:grid;grid-template-columns:1.2fr 1fr;gap:90px;max-width:970px;margin:65px auto 80px;align-items:center}.join h1{font-size:49px}.intro{font-size:21px;color:var(--muted)}.join .panel{padding:32px}.full{width:100%;margin:18px 0}.tags{display:flex;gap:8px}.tags span{background:#dae2fc;color:var(--blue);padding:6px 12px;font-size:14px;border-radius:6px}.game-heading,.row,.actions{display:flex;align-items:center;justify-content:space-between;gap:15px;flex-wrap:wrap}.game-heading{margin:18px 0 25px}.workspace{display:grid;grid-template-columns:275px minmax(0,1fr);gap:22px;align-items:start}.mission{display:block;width:100%;text-align:left;margin-bottom:10px;padding:14px 12px;line-height:1.5}.mission small{display:block;font-size:13px;color:var(--muted);font-weight:400;margin-bottom:5px}.mission.active{background:var(--light);border-color:var(--blue)}.mission.done{border-color:#5caa91}.divider{border-top:1px solid var(--line);padding-top:18px;margin-top:18px}.pill{display:inline-block;padding:5px 11px;font-size:14px;background:var(--light);color:var(--blue);border-radius:30px;font-weight:700}.target{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;padding-bottom:20px;border-bottom:1px solid var(--line)}.target h2{font-size:28px;margin-top:6px}.target p{margin:0;font-size:15px;color:var(--muted)}.target .pill{white-space:nowrap}.chat{min-height:210px;max-height:550px;overflow-y:auto;padding:22px 2px;scroll-behavior:smooth}.bubble{max-width:88%;border-radius:12px;padding:15px 18px;margin:0 0 16px;background:#f0f3f8;white-space:pre-wrap;overflow-wrap:anywhere}.bubble.user{margin-left:auto;background:var(--ink);color:white}.bubble small{display:block;font-size:12px;font-weight:700;color:var(--muted);margin-bottom:7px}.bubble.user small{color:#cbd7ec}.empty{text-align:center;padding:45px 15px;color:var(--muted)}.empty strong{display:block;color:var(--ink);margin-bottom:10px}.actions{margin-top:12px}.secondary{justify-content:flex-start;border-top:1px solid var(--line);margin-top:20px;padding-top:12px}.verdict{border-radius:9px;font-size:15px;margin-bottom:15px}.verdict:not(:empty){padding:13px 17px;background:var(--light)}.verdict.success{background:#e3f5ec;color:var(--green)}.verdict.error{background:#fff0f2;color:var(--red)}details{border:1px solid var(--line);border-radius:9px;padding:12px 14px;margin-top:15px;font-size:14px}summary{font-weight:700;cursor:pointer}details p{margin:12px 0}pre{white-space:pre-wrap;overflow-wrap:anywhere;font:14px/1.7 'Malgun Gothic',sans-serif;max-height:400px;overflow:auto;background:#f4f6fb;padding:14px;border-radius:6px}.ranking{margin-top:30px}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;text-align:left;font-size:15px}th,td{padding:14px 10px;border-bottom:1px solid var(--line)}th{font-size:13px;color:var(--muted);font-weight:700}td:first-child{font-weight:800;color:var(--blue)}.dots{white-space:nowrap;color:var(--green)}#status{font-size:15px;color:var(--green)}#status:not(:empty){padding:12px 16px;background:#e3f5ec;margin-bottom:20px;border-radius:8px}#status.bad{background:#fff0f2;color:var(--red)}footer{text-align:center;color:var(--muted);font-size:12px;margin:30px 0}.teacher-controls{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;margin:20px 0}.stat{background:var(--ink);color:white;padding:20px;border-radius:12px}.stat small{display:block;color:#ccd8ed;font-size:13px}.stat strong{font-size:26px}.teacher-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.review-form{display:grid;grid-template-columns:1fr 1fr;gap:12px}.review-form .wide{grid-column:1/-1}.record{border-bottom:1px solid var(--line);padding:14px 0}.record p{margin-bottom:7px;white-space:pre-wrap;overflow-wrap:anywhere}.badge{background:#eef0ff;padding:2px 7px;border-radius:5px;font-size:12px}dialog{border:1px solid var(--line);border-radius:15px;max-width:450px;width:90%;padding:26px;color:var(--ink)}dialog::backdrop{background:#18263e88}[hidden]{display:none!important}@media(max-width:900px){.join{gap:35px}.workspace{grid-template-columns:230px 1fr}.teacher-grid{grid-template-columns:1fr}}@media(max-width:650px){header{padding:14px 18px;flex-wrap:wrap;gap:10px}nav{gap:15px}.brand{font-size:23px}.brand span{font-size:14px}main{padding:18px 14px}.join,.workspace{grid-template-columns:1fr}.join{margin:20px auto;gap:25px}.join h1{font-size:38px}.panel,.join .panel{padding:20px}.game-heading h1{font-size:27px}.workspace aside{padding:18px}.target{flex-direction:column;gap:10px}.chat{max-height:480px}.bubble{max-width:95%}.stats{grid-template-columns:1fr 1fr}.stat{padding:15px}.review-form{grid-template-columns:1fr}.review-form .wide{grid-column:auto}.intro{font-size:19px}.ranking .row{align-items:flex-start}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

.course-return{position:fixed;right:18px;bottom:16px;z-index:20}.course-return a{display:block;background:#17233d;color:white;border:1px solid #aab8d0;padding:9px 15px;border-radius:30px;text-decoration:none;font:14px/1.6 system-ui,sans-serif}