:root{--ground:#F4F6FA;--paper:#FFFFFF;--ink:#1B2540;--ink-2:#56607A;--ink-3:#8A92A8;--rule:#DCE3EE;--navy:#23346B;--navy-soft:#E6EBF7;--hi:#F6CF4A;--hi-soft:#FFF4C7;--danger:#B8323A;--danger-soft:#FBE9EA;--ok:#2E7D5B;--ok-soft:#E1F2EA;--display:"Do Hyeon","Noto Sans KR",system-ui,sans-serif;--body:"Noto Sans KR",system-ui,-apple-system,"Apple SD Gothic Neo","Malgun Gothic",sans-serif;--mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;color-scheme:light}@media (prefers-color-scheme:dark){:root{color-scheme:dark;--ground:#10141D;--paper:#171C28;--ink:#E8ECF5;--ink-2:#A9B1C6;--ink-3:#737C93;--rule:#2A3143;--navy:#9FB4F0;--navy-soft:#222B42;--hi:#E9C247;--hi-soft:#3A3320;--danger:#F0797F;--danger-soft:#3A1E22;--ok:#6FC79D;--ok-soft:#1B3328}}*{box-sizing:border-box}html,body{margin:0}body{background:var(--ground);color:var(--ink);font-family:var(--body);font-size:15px;line-height:1.6;-webkit-text-size-adjust:100%}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer}a{color:var(--navy)}:focus-visible{outline:2px solid var(--navy);outline-offset:2px}h1,h2,h3,h4,p{margin:0}.num{font-variant-numeric:tabular-nums}.muted{color:var(--ink-3);font-size:13px}.display{font-family:var(--display);font-weight:400}.wrap{max-width:1040px;margin:0 auto;padding:20px max(16px,env(safe-area-inset-left)) calc(72px + env(safe-area-inset-bottom))}header.top{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:18px}.brand{text-decoration:none;color:inherit}.brand small{display:block;font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:var(--navy)}.brand h1{font-family:var(--display);font-weight:400;font-size:26px;line-height:1.15}.brand h1 mark{background:linear-gradient(transparent 58%,var(--hi) 58%);color:inherit;padding:0 2px}.top-acts{display:flex;gap:6px;flex-wrap:wrap;align-items:center}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid var(--rule);background:var(--paper);border-radius:8px;padding:8px 14px;font-weight:500;font-size:14px;line-height:1.3;text-decoration:none;color:var(--ink)}.btn:hover{border-color:var(--navy)}.btn.primary{background:var(--navy);border-color:var(--navy);color:var(--paper)}.btn.hi{background:var(--hi);border-color:var(--hi);color:#1b2540;font-weight:700}.btn.ghost{background:transparent;border-color:transparent;color:var(--ink-2)}.btn.danger{color:var(--danger);border-color:transparent;background:transparent}.btn.sm{padding:5px 10px;font-size:13px}.btn.lg{padding:12px 18px;font-size:16px}.btn:disabled{opacity:.5;cursor:default}.tabs{display:flex;gap:2px;overflow-x:auto;border-bottom:1px solid var(--rule);margin-bottom:20px;scrollbar-width:none}.tabs::-webkit-scrollbar{display:none}.tab{border:0;background:none;padding:10px 12px;font-size:14px;color:var(--ink-2);border-bottom:3px solid transparent;white-space:nowrap;text-decoration:none}.tab.active{color:var(--ink);font-weight:700;border-color:var(--hi)}.chips{display:flex;gap:6px;flex-wrap:wrap}.chip{border:1px solid var(--rule);background:var(--paper);border-radius:999px;padding:5px 12px;font-size:13px;color:var(--ink-2)}.chip[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:var(--paper);font-weight:500}.chip .n{font-family:var(--mono);font-size:11px;opacity:.7;margin-left:4px}.card{background:var(--paper);border:1px solid var(--rule);border-radius:12px;padding:18px}.sec-title{font-size:12px;letter-spacing:.12em;color:var(--ink-3);font-weight:700;margin:26px 0 10px}.empty{padding:32px 16px;text-align:center;color:var(--ink-3);border:1px dashed var(--rule);border-radius:12px}.center-status{padding:64px 16px;text-align:center;color:var(--ink-3)}.stack{display:flex;flex-direction:column;gap:8px}.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.spacer{flex:1}.bar{height:6px;background:var(--navy-soft);border-radius:99px;overflow:hidden;min-width:60px}.bar i{display:block;height:100%;background:var(--navy);border-radius:99px;transition:width .4s}.bar.done i{background:var(--ok)}.pill{display:inline-block;font-size:12px;border-radius:99px;padding:2px 9px;white-space:nowrap;font-weight:500}.pill.done{background:var(--ok-soft);color:var(--ok)}.pill.doing{background:var(--navy-soft);color:var(--navy)}.pill.none{color:var(--ink-3);border:1px dashed var(--rule)}.pill.off{background:var(--danger-soft);color:var(--danger)}.pill.cat{background:var(--hi-soft);color:var(--ink)}.login{max-width:400px;margin:8vh auto 0}.login .brand{display:block;text-align:center;margin-bottom:22px}.login .brand h1{font-size:32px}.check{display:flex;gap:8px;align-items:center;font-size:14px;color:var(--ink-2)}form.card,.form{display:flex;flex-direction:column;gap:16px}.form-title{font-family:var(--display);font-weight:400;font-size:26px}.field{display:flex;flex-direction:column;gap:6px;min-width:0}.field>label,.field .lbl{font-size:13px;font-weight:700;color:var(--ink-2)}.hint{font-size:12px;color:var(--ink-3)}.inp{border:1px solid var(--rule);background:var(--ground);border-radius:8px;padding:10px 12px;width:100%}textarea.inp{min-height:110px;resize:vertical;line-height:1.7}.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}.seg{display:inline-flex;border:1px solid var(--rule);border-radius:8px;overflow:hidden;flex-wrap:wrap;align-self:flex-start}.seg button{border:0;background:var(--paper);padding:7px 13px;font-size:14px;color:var(--ink-2)}.seg button[aria-pressed=true]{background:var(--ink);color:var(--paper)}.msg{font-size:13px}.msg.err{color:var(--danger)}.msg.ok{color:var(--ok)}.form-acts{display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap;align-items:center}.form-acts .r{display:flex;gap:8px;margin-left:auto}.confirm{display:inline-flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:13px;color:var(--danger)}.file{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:8px 12px;border:1px solid var(--rule);border-radius:8px;font-size:13px;background:var(--ground)}.file span{word-break:break-all}.upload-bar{height:8px;background:var(--navy-soft);border-radius:99px;overflow:hidden}.upload-bar i{display:block;height:100%;background:var(--hi)}.hello{font-family:var(--display);font-weight:400;font-size:30px;line-height:1.2;margin-bottom:14px}.today{display:grid;grid-template-columns:1fr;gap:14px;background:#1b2540;color:#fff;border-radius:14px;padding:20px}@media (min-width:640px){.today{grid-template-columns:1fr auto;align-items:end}}.today .lbl{font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:#f6cf4a}.today h2{font-family:var(--display);font-weight:400;font-size:26px;line-height:1.2;margin:4px 0 10px;text-wrap:balance}.today .meta{font-size:13px;opacity:.75}.today .bar{background:#ffffff2e;margin:10px 0 6px;max-width:420px}.today .bar i{background:#f6cf4a}.lec-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px;margin-top:12px}.lec-card{display:flex;flex-direction:column;gap:8px;text-align:left;background:var(--paper);border:1px solid var(--rule);border-radius:12px;padding:14px 16px;text-decoration:none;color:inherit}.lec-card:hover{border-color:var(--navy)}.lec-card .t{display:flex;justify-content:space-between;gap:8px;align-items:center}.lec-card h3{font-size:16px;font-weight:700;line-height:1.4}.lec-card .f{display:flex;justify-content:space-between;font-size:12px;color:var(--ink-3)}.lec-head{margin:6px 0 14px}.lec-head h2{font-family:var(--display);font-weight:400;font-size:28px;line-height:1.2;text-wrap:balance;margin-top:4px}.player{position:relative;background:#000;border-radius:12px;overflow:hidden;aspect-ratio:16/9;max-width:100%;user-select:none;-webkit-user-select:none}.player:fullscreen{border-radius:0;aspect-ratio:auto;width:100%;height:100%}.player video{width:100%;height:100%;display:block;background:#000}.watermark{position:absolute;pointer-events:none;color:#ffffff47;font-size:13px;font-weight:700;transition:top 1.5s,left 1.5s;white-space:nowrap;text-shadow:0 0 2px rgba(0,0,0,.4)}.overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;background:#0a0e18cc;color:#fff;text-align:center;padding:16px}.overlay strong{font-family:var(--display);font-weight:400;font-size:22px}.ctrl{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-top:10px}.speeds{display:inline-flex;border:1px solid var(--rule);border-radius:8px;overflow:hidden;background:var(--paper)}.speeds button{border:0;background:none;padding:6px 10px;font-size:13px;font-family:var(--mono);color:var(--ink-2)}.speeds button[aria-pressed=true]{background:var(--ink);color:var(--paper)}.myprog{display:flex;align-items:center;gap:10px;font-size:13px}.myprog .bar{width:140px}.cols{display:grid;grid-template-columns:1fr;gap:18px;margin-top:20px}@media (min-width:760px){.cols{grid-template-columns:1.2fr 1fr}}ol.toc{list-style:none;counter-reset:t;margin:0;padding:0;background:var(--paper);border:1px solid var(--rule);border-radius:10px}ol.toc li{counter-increment:t;display:grid;grid-template-columns:30px 1fr;gap:6px;padding:10px 14px;border-bottom:1px solid var(--rule)}ol.toc li:last-child{border-bottom:0}ol.toc li:before{content:counter(t);font-family:var(--mono);color:var(--navy);font-size:13px;padding-top:2px}.desc{white-space:pre-wrap;font-size:14px;color:var(--ink-2)}.pdf{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 14px;background:var(--paper);border:1px solid var(--rule);border-radius:10px;flex-wrap:wrap}.pdf b{font-weight:500;word-break:break-all}.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px}.stat{background:var(--paper);border:1px solid var(--rule);border-radius:12px;padding:14px 16px;text-decoration:none;color:inherit}.stat .k{font-size:12px;color:var(--ink-3)}.stat .v{font-family:var(--display);font-size:34px;line-height:1.1}.stat .v small{font-family:var(--body);font-size:14px;color:var(--ink-3);margin-left:2px}.stat.warn .v{color:var(--danger)}.tbl-wrap{overflow-x:auto;background:var(--paper);border:1px solid var(--rule);border-radius:12px}table{border-collapse:collapse;width:100%;font-size:14px}th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--rule);white-space:nowrap}th{font-size:12px;color:var(--ink-3);font-weight:700;background:var(--ground)}tr:last-child td{border-bottom:0}tr.click{cursor:pointer}tr.click:hover td{background:var(--navy-soft)}td .bar{width:90px;display:inline-block;vertical-align:middle;margin-right:8px}.toolbar{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:12px}.assign{border:1px solid var(--rule);border-radius:10px;padding:12px;display:flex;flex-direction:column;gap:10px;background:var(--ground)}.assign-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:2px 12px;max-height:320px;overflow:auto}.assign-list label{display:flex;gap:8px;align-items:center;font-size:14px;padding:4px 0}.assign-list label small{color:var(--ink-3)}.split{display:grid;grid-template-columns:1fr;gap:14px}@media (min-width:760px){.split{grid-template-columns:repeat(3,1fr)}}.split h4{font-size:14px;margin-bottom:8px;display:flex;justify-content:space-between}.split ul{list-style:none;margin:0;padding:0;font-size:14px}.split li{padding:6px 0;border-bottom:1px solid var(--rule);display:flex;justify-content:space-between;gap:8px}.split li:last-child{border-bottom:0}.banner{background:var(--hi-soft);border-radius:10px;padding:10px 14px;font-size:13px;display:flex;justify-content:space-between;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:16px}.modal-bg{position:fixed;top:0;right:0;bottom:0;left:0;background:#0a0e1880;display:flex;align-items:flex-start;justify-content:center;padding:6vh 16px;overflow:auto;z-index:50}.modal{width:100%;max-width:560px}@media (max-width:480px){.brand h1{font-size:22px}.hello{font-size:25px}}@media (prefers-reduced-motion:reduce){*{transition:none!important}}.sms-preview{white-space:pre-wrap;font-family:var(--body);font-size:14px;line-height:1.6;background:#fee500;color:#191919;border-radius:4px 14px 14px;padding:12px 14px;max-width:360px;margin:0}.kind-tag{font-size:12px;border-radius:4px;padding:2px 8px;background:var(--navy-soft);color:var(--navy);white-space:nowrap}.score-inp{width:80px;padding:6px 8px}.note-inp{min-width:180px;padding:6px 8px}.hw-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.hw-item{background:var(--paper);border:1px solid var(--rule);border-radius:12px;padding:12px 16px}.hw-item pre{white-space:pre-wrap;font-family:var(--body);margin:6px 0 0;font-size:14px;color:var(--ink-2)}