:root{--bg:#F4F5F7;--card:#FFFFFF;--text:#161A23;--sub:#4F5662;--line:#E1E4E9;--line2:#C9CED6;--dash:#8A919C;--blue:#1E4FCF;--blue-weak:#E7EDFB;--blue-dark:#153A9C;--orange:#A9520C;--orange-weak:#FCEEDF;--fig:#FAFBFC}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.55 "Noto Sans KR","Malgun Gothic","Apple SD Gothic Neo",system-ui,sans-serif}
a{color:var(--blue)}a:hover{color:var(--blue-dark)}
button{font:inherit;color:inherit;cursor:pointer}
button:disabled{cursor:default}
.btn:disabled{opacity:.5;cursor:not-allowed}
h1{margin:0;font-size:28px;font-weight:700}
h2{margin:0;font-size:17px}
.btn{white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;border-radius:10px;border:0;background:var(--blue);color:#fff;font-weight:700;text-decoration:none}
.btn:hover{background:var(--blue-dark);color:#fff}
.btn.ghost{background:var(--card);color:var(--text);border:1px solid var(--line2);font-weight:500}
.btn.ghost:hover{border-color:var(--blue);background:var(--card);color:var(--text)}
.btn.sm{min-height:40px;padding:0 14px;font-size:14px}
.btn.big{min-height:52px;padding:0 28px;font-size:17px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px}
.sub{color:var(--sub)}
.small{font-size:13px}
.chip{display:inline-block;padding:3px 8px;border-radius:6px;font-size:13px;background:var(--card);border:1px dashed var(--dash);color:var(--sub)}
.chip.pass{background:var(--blue-weak);color:var(--blue);border:1px solid var(--blue-weak)}
.chip.fail{background:var(--orange-weak);color:var(--orange);border:1px solid var(--orange-weak);font-weight:500}
.chip.fast{border-style:solid;border-color:#E3B341;box-shadow:inset 3px 0 0 #E3B341}
.fastnote{border:1px solid #E3B341;background:#FFF8E6;border-radius:10px;padding:12px 16px;display:flex;flex-direction:column;gap:6px}
.lcmp{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.lcmp>div{border-radius:10px;padding:12px 16px;background:var(--bg2)}
.lcmp>div.f{background:#FFF8E6;border:1px solid #E3B341}
@media(max-width:640px){.lcmp{grid-template-columns:1fr}}
.badge{align-self:flex-start;padding:4px 10px;border-radius:6px;font-size:13px;font-weight:700;background:var(--bg);color:var(--sub);border:1px dashed var(--dash)}
.badge.pass{background:var(--blue-weak);color:var(--blue);border:0}
.badge.fail{background:var(--orange-weak);color:var(--orange);border:0}
/* dashboards */
.dash{display:flex;flex-wrap:wrap;min-height:100vh}
.side{flex:1 1 240px;max-width:100%;background:var(--card);border-right:1px solid var(--line);padding:28px 20px;display:flex;flex-direction:column;gap:24px}
.side .nav{display:flex;flex-direction:column;gap:4px}
.side .nav a{display:flex;justify-content:space-between;align-items:center;padding:12px 14px;border-radius:10px;color:var(--text);text-decoration:none;font-size:15px}
.side .nav a.on{background:var(--blue-weak);color:var(--blue);font-weight:700}
.side .nav a .st{font-size:12px;color:var(--sub)}
.side .nav a.on .st{color:var(--blue)}
.side .save{margin-top:auto;display:flex;flex-direction:column;gap:10px;padding:14px;border-radius:10px;background:var(--bg);font-size:13px;color:var(--sub);line-height:1.5}
.side .save button{min-height:36px;padding:0 12px;border:1px solid var(--line2);border-radius:8px;background:var(--card)}
.dmain{flex:999 1 560px;min-width:0;padding:36px 48px 90px;display:flex;flex-direction:column;gap:22px}
.todaybox{border:2px solid var(--blue);padding:28px;display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:20px}
.counts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.counts a{padding:18px 20px;display:flex;flex-direction:column;gap:4px;text-decoration:none;color:var(--text)}
.counts b{font-size:28px}
.cal{min-width:720px;display:grid;grid-template-columns:80px repeat(5,minmax(0,1fr));gap:8px;font-size:14px}
.cal .c{min-height:56px;padding:8px 10px;border-radius:8px;display:flex;flex-direction:column;justify-content:center;gap:2px;background:var(--card);border:1px solid var(--line)}
.cal .c.done{background:var(--bg)}
.cal .c.today{background:var(--blue-weak);border:2px solid var(--blue)}
.cal .c span:last-child{font-size:12px;color:var(--sub)}
.cal .wk{display:flex;align-items:center;font-weight:700}
.cell{width:26px;height:26px;padding:0;border-radius:5px;cursor:pointer;background:var(--card);border:1px dashed var(--dash)}
.cell.pass{background:var(--blue);border:1px solid var(--blue)}
.cell.fail{background:var(--orange-weak);border:2px solid var(--orange)}
.cell.picked{outline:3px solid var(--text);outline-offset:2px}
.legend{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:8px;background:var(--card);border:1px solid var(--line);font-size:14px}
.legend .cell{width:14px;height:14px;border-radius:3px;cursor:default}
table{width:100%;border-collapse:collapse;font-size:15px}
td,th{padding:13px 10px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}
th{font-size:13px;font-weight:500;color:var(--sub)}
tr:last-child td{border-bottom:0}
.tog{min-height:40px;padding:0 14px;border:1px solid var(--line2);border-radius:20px;background:var(--card);font-size:14px}
.tog[aria-pressed=true]{border:2px solid var(--blue);background:var(--blue-weak);color:var(--blue);font-weight:500}
/* pages */
.page{min-height:100vh;display:flex;flex-direction:column}
header.top{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding:16px 40px;background:var(--card);border-bottom:1px solid var(--line)}
header.top .brand{font-size:17px;font-weight:700;color:var(--text);text-decoration:none}
header.top .left{display:flex;align-items:center;gap:14px}
a.logo{display:inline-flex;align-items:center;gap:8px;font-size:19px;font-weight:800;color:var(--text);text-decoration:none;min-height:36px}
a.logo:hover{color:var(--blue-dark)}
a.logo svg{width:28px;height:28px;flex:none}
header.top .left .bar{width:1px;height:20px;background:var(--line2)}
header.top .meta{display:flex;flex-wrap:wrap;align-items:center;gap:16px;font-size:14px}
header.top .meta .cur{font-weight:700;color:var(--blue)}
.wrap{flex:1 1 auto;width:100%;max-width:1280px;margin:0 auto;padding:28px 40px 90px;display:flex;flex-wrap:wrap;gap:24px;align-items:flex-start}
.qcard{flex:999 1 640px;min-width:0;padding:28px;display:flex;flex-direction:column;gap:18px}
.qtext{margin:0;font-size:19px;line-height:1.75;white-space:pre-line}
.fig{display:flex;justify-content:center;padding:12px;background:var(--fig);border-radius:10px}
.fig svg{display:block;width:100%;height:auto;max-height:460px}
.rgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.rcard{display:flex;flex-direction:column;gap:8px;padding:22px;text-align:left;font:inherit;color:inherit;cursor:pointer}
.rcard:hover{border-color:var(--blue)}
.rcard.on{border:2px solid var(--blue);padding:21px}
@media (max-width:760px){.rgrid{grid-template-columns:minmax(0,1fr)}}
.prior-tag{display:inline-block;padding:2px 8px;border-radius:6px;background:var(--bg);border:1px solid var(--line2);font-size:12px;color:var(--sub)}
.qgrid{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,2fr);gap:24px;align-items:start}
.qgrid .fig{padding:8px}
.ftable-wrap{display:block;padding:0;background:none}
.ftable{width:100%;border-collapse:collapse;font-size:18px;background:#fff}
.ftable th,.ftable td{border:1px solid #222;padding:8px 10px;text-align:center;white-space:nowrap}
.ftable th{background:#eef1f6;font-weight:500;white-space:normal;word-break:keep-all;font-size:17px;color:var(--text)}
.ftable tr.sum td{font-weight:700}
.tnote{margin-top:6px;text-align:right;font-size:16px;color:var(--text)}
.ftable tr:last-child td{border-bottom:1px solid #222}
.ftable.tight th,.ftable.tight td{padding:8px 5px}
@media (max-width:900px){.qgrid{grid-template-columns:minmax(0,1fr)}.qgrid .fig svg{max-width:520px;margin:0 auto}}
.fig img{max-width:100%;height:auto;border-radius:6px;background:#fff}
.opts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.opts.five{grid-template-columns:repeat(5,minmax(0,1fr))}
.opt{min-height:52px;text-align:left;padding:10px 16px;border:1px solid var(--line2);border-radius:10px;background:var(--card);font-size:16px;line-height:1.45}
.opts.five .opt{text-align:center;font-size:17px}
.opt.sel,.opt.right{border:2px solid var(--blue);background:var(--blue-weak);padding:9px 15px}
.opt.wrong{border:2px solid var(--orange);background:var(--orange-weak);padding:9px 15px}
.fb{border-radius:10px;padding:14px 16px;font-size:15px;line-height:1.6}
.fb.ok{background:var(--blue-weak)}
.fb.ok strong{color:var(--blue)}
.fb.no{background:var(--orange-weak)}
.fb.no strong{color:var(--orange)}
.changes{padding:14px 16px;border:1px solid var(--line);border-radius:10px;display:flex;flex-direction:column;gap:8px;font-size:14px}
.steps{margin:0;padding-left:1.3em;line-height:1.9}
.stepbox{padding:12px;border:1px solid var(--line);border-radius:10px;display:flex;flex-direction:column;gap:6px}
.stepbox.stuck{border:2px solid var(--orange);padding:11px}
.stepbox .t{font-size:14px;font-weight:500}
.stepbox .h{font-size:13px;color:var(--sub);line-height:1.6}
.stepbox button{align-self:flex-start;min-height:36px;padding:0 12px;border:1px solid var(--line2);border-radius:8px;background:var(--card);font-size:13px}
.grid25{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px}
.grid25 button{min-height:44px;border-radius:8px;border:1px solid var(--line2);background:var(--card);font-size:14px}
.grid25 button.ans{border-color:var(--blue);background:var(--blue);color:#fff}
.grid25 button.cur{border:2px solid var(--blue);background:var(--blue-weak);color:var(--text);font-weight:700}
.grid25 button.ans.cur{background:var(--blue);color:#fff}
.timer{font-size:36px;font-weight:700;font-variant-numeric:tabular-nums}
.li{display:flex;justify-content:space-between;gap:8px;padding:9px 10px;border-radius:8px;font-size:14px;border:0;background:none;text-align:left;width:100%}
.li span:last-child{white-space:nowrap}
.li.on{background:var(--blue-weak);font-weight:700}
details.concept{padding:18px 22px}
details.concept summary{font-size:15px;font-weight:700;cursor:pointer}
.lesson{display:flex;flex-wrap:wrap;gap:20px;margin-top:14px;align-items:flex-start}
.lesson .ltext{flex:1 1 340px;min-width:0;display:flex;flex-direction:column;gap:12px;font-size:16px;line-height:1.75}
.lesson .lcore{margin:0}
.lesson .lbox{border-radius:10px;padding:12px 16px}
.lesson .lbox>strong{display:block;font-size:14px;margin-bottom:4px}
.lesson .lrule{background:var(--blue-weak)}.lesson .lrule>strong{color:var(--blue)}
.lesson .lrule ul{margin:0;padding-left:1.2em}
.lesson .lex{border:1px solid var(--line)}
.lesson .lex ol{margin:6px 0 0;padding-left:1.3em}
.lesson .lex .lans{margin-top:6px;font-weight:700;color:var(--blue)}
.lesson .lex details summary{cursor:pointer;color:var(--blue);font-size:15px;margin-top:6px}
.lesson .ltrap{background:var(--orange-weak)}.lesson .ltrap>strong{color:var(--orange)}
.lesson .lside{flex:0 1 auto;max-width:100%;display:flex;flex-direction:column;gap:8px;align-items:center}
.lesson .lfig{padding:12px;background:var(--fig);border-radius:10px;max-width:100%}
.lesson .lfig svg{display:block;max-width:100%;height:auto}
.lesson .lcap{font-size:14px;color:var(--sub);text-align:center;max-width:380px;line-height:1.5}
.lesson .ftable{width:auto}
.startcard{padding:28px;display:flex;flex-direction:column;gap:14px;align-items:flex-start}
.review-badge{display:inline-block;padding:2px 8px;border-radius:6px;background:var(--orange-weak);color:var(--orange);font-size:12px;font-weight:700}
.clock{display:inline-flex;align-items:baseline;gap:8px;flex-wrap:wrap;padding:6px 12px;border-radius:8px;background:var(--blue-weak)}
.clock #clock{font-size:22px;font-weight:700;color:var(--blue);font-variant-numeric:tabular-nums}
.clock .goal{font-size:14px;color:var(--sub)}
.clock.over{background:var(--orange-weak)}
.clock.over #clock{color:var(--orange)}
.banner{display:flex;flex-wrap:wrap;align-items:center;gap:14px;padding:16px 18px;border-radius:10px}
.banner.ok{background:var(--blue-weak)}.banner.no{background:var(--orange-weak)}
.banner .big{font-size:30px;font-weight:700;font-variant-numeric:tabular-nums}
.banner.ok .big{color:var(--blue)}.banner.no .big{color:var(--orange)}
.banner>div{flex:1 1 300px;display:flex;flex-direction:column;gap:2px}
fieldset.iv{border:0;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
fieldset.iv legend{font-size:16px;font-weight:700;margin-bottom:10px;padding:0}
.reason{min-height:48px;text-align:left;padding:0 16px;border:1px solid var(--line2);border-radius:10px;background:var(--card);font-size:15px}
.reason.on{border:2px solid var(--blue);background:var(--blue-weak);padding:0 15px;font-weight:500}
.elpick{min-height:44px;padding:0 14px;border:1px solid var(--line2);border-radius:22px;background:var(--card);font-size:14px}
.elpick.on{border:2px solid var(--blue);background:var(--blue-weak);padding:0 13px;font-weight:500}
.tbar{display:flex;align-items:center;gap:10px;font-size:14px}
.tbar .track{flex:1 1 auto;height:10px;border-radius:5px;background:var(--line)}
.tbar .track i{display:block;height:10px;border-radius:5px;background:var(--blue)}
.tbar .track i.o{background:var(--orange)}
.tbar .tv{width:44px;text-align:right;font-variant-numeric:tabular-nums}
.self{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.self>div{display:flex;flex-direction:column;gap:8px}
@media (max-width:900px){.self{grid-template-columns:1fr}}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:var(--text);color:#fff;padding:10px 16px;border-radius:10px;opacity:0;transition:opacity .2s;pointer-events:none;z-index:9}
.toast.show{opacity:1}
#datebox{position:fixed;right:16px;bottom:16px;z-index:7;background:var(--card);border:1px dashed var(--dash);border-radius:10px;padding:8px 10px;display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;color:var(--sub);box-shadow:0 2px 8px rgba(0,0,0,.08)}
#datebox input{font:inherit;font-size:13px;padding:4px 6px;border:1px solid var(--line2);border-radius:6px}
#datebox button{min-height:30px;padding:0 10px;border:1px solid var(--line2);border-radius:6px;background:var(--card);font-size:12px}
@media (max-width:1000px){.dmain{padding:28px 20px 90px}.wrap{padding:24px 16px 90px}header.top{padding:14px 16px}.opts.five{grid-template-columns:repeat(5,minmax(0,1fr))}}
@media (max-width:640px){.counts{grid-template-columns:1fr}.opts{grid-template-columns:1fr}}