:root{--navy:#1f3a5f;--ink:#22303c;--sub:#566472;--line:#d4dce4;--bg:#f4f6f8;--sky:#e8f0f8;--mint:#e2f2e9;--green:#1d7a4d;--rose:#fae6e2;--red:#bd3a2a;--sand:#fbf2df}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 "Noto Sans KR","Malgun Gothic",sans-serif}
button{font:inherit;cursor:pointer;border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:6px;padding:6px 12px}
button:hover{border-color:var(--navy)}
button.main{background:var(--navy);border-color:var(--navy);color:#fff;font-weight:700}
input,select{font:inherit;border:1px solid var(--line);border-radius:6px;padding:7px 10px;background:#fff;color:var(--ink);max-width:100%}
header{background:var(--navy);color:#fff;padding:10px 16px;display:flex;align-items:center;gap:12px;flex-wrap:wrap;position:sticky;top:0;z-index:20}
header b{font-size:17px;cursor:pointer}
header .who{margin-left:auto;font-size:14px}
header button{background:transparent;color:#fff;border-color:#ffffff66;padding:3px 10px;font-size:13px}
main{max-width:1120px;margin:0 auto;padding:16px 16px 120px}
.tabs{display:flex;gap:4px;flex-wrap:wrap;border-bottom:2px solid var(--navy);margin:0 0 14px}
.tabs button{border:0;border-radius:6px 6px 0 0;background:#e3e8ee;font-weight:600}
.tabs button.on{background:var(--navy);color:#fff}
.bookcard{background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px;margin-bottom:12px}
.bookcard h2{margin:0 0 4px;color:var(--navy);font-size:19px}
.muted{color:var(--sub);font-size:13.5px}
.concept{margin:22px 0 10px;padding:9px 14px;background:var(--navy);color:#fff;border-radius:8px;font-size:17px;font-weight:700}
.typehead{margin:18px 0 8px;padding:6px 10px;background:var(--sky);color:var(--navy);border-radius:6px;font-weight:700}
.parthead{margin:18px 0 8px;font-weight:700;color:var(--navy);border-left:4px solid var(--navy);padding-left:8px}
.slot{border:1px dashed #aab6c2;border-radius:8px;padding:9px 12px;background:#fff;color:var(--sub);font-size:14px;margin:8px 0}
.conceptimg{display:block;width:100%;max-width:820px;background:#fff;border:1px solid var(--line);border-radius:8px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:12px;align-items:start}
.card{background:#fff;border:1px solid var(--line);border-radius:8px;padding:10px;min-width:0}
.card.wide{grid-column:1/-1}
.pilrow{display:grid;grid-template-columns:1fr 1fr;gap:14px;align-items:start}
.card.pil{border:2px solid var(--navy);margin:8px 0}
.card.picked{outline:2px solid var(--navy)}
.card.done{border-color:#7fc3a0}
.card.wrong{border-color:#e09a8f}
.cardtop{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-bottom:6px}
.no{font-weight:800;color:var(--navy);font-size:16px}
.tag{font-size:12px;padding:1px 7px;border-radius:10px;background:#e9edf1;color:#3c4a57}
.tag.기출{background:var(--sand);color:#6d5213}
.tag.교과서{background:var(--mint);color:#17603d}
.src{font-size:12.5px;color:var(--sub);width:100%}
.ans{font-size:13px;color:var(--red);font-weight:700;margin:4px 0}
.qimg{display:block;width:100%;min-height:50px;-webkit-user-drag:none;user-select:none}
.actions{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}
.actions .on-done{background:var(--mint);border-color:var(--green);color:var(--green);font-weight:700}
.actions .on-wrong{background:var(--rose);border-color:var(--red);color:var(--red);font-weight:700}
.after{margin-top:8px;padding-top:8px;border-top:1px dashed var(--line)}
.filter{display:flex;gap:6px;flex-wrap:wrap;align-items:center;margin-bottom:10px}
.filter button.on{background:var(--navy);color:#fff;border-color:var(--navy)}
.bar{position:fixed;left:0;right:0;bottom:0;background:#fff;border-top:2px solid var(--navy);padding:10px 16px;display:flex;gap:8px;align-items:center;flex-wrap:wrap;z-index:30}
.bar input[type=text]{flex:1;min-width:180px}
table{border-collapse:collapse;width:100%;background:#fff}
th{background:var(--navy);color:#fff;text-align:left;padding:7px 10px;font-size:14px}
td{border-bottom:1px solid var(--line);padding:7px 10px;font-size:14px;vertical-align:top}
.tablewrap{overflow-x:auto}
.login{max-width:380px;margin:60px auto;background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px}
.login h1{margin:0 0 4px;color:var(--navy);font-size:22px}
.login input{width:100%;margin-top:10px}
.login .main{width:100%;margin-top:12px}
.err{color:var(--red);font-size:14px;margin-top:8px;min-height:20px}
.quick{margin-top:18px;padding-top:12px;border-top:1px dashed var(--line)}
.quick button{margin:4px 4px 0 0}
.progress{height:8px;background:#e3e8ee;border-radius:5px;overflow:hidden;margin:6px 0 14px}
.progress i{display:block;height:100%;background:var(--green)}
.form{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0 16px}
.notice{background:var(--sand);padding:10px 14px;border-radius:8px;font-size:14px;margin:8px 0}
@media (max-width:600px){.grid,.pilrow{grid-template-columns:1fr}main{padding:12px 16px 140px}}
@media print{body.student *{display:none!important}body.student::before{content:"학생 화면은 인쇄할 수 없습니다.";display:block;padding:40px;font-size:20px}}
.volgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px;margin-top:10px}
.volcard{border:1px solid var(--line);border-radius:8px;padding:12px;background:var(--bg)}
.volcard button{margin-top:8px}
.volcard button:disabled{opacity:.5;cursor:default}
.unit{color:var(--navy);margin:18px 0 0;font-size:20px}
.pdfbar{display:flex;gap:8px;align-items:center;flex-wrap:wrap;background:#fff;border:1px solid var(--line);border-radius:8px;padding:9px 12px;margin-bottom:12px}
.pickrow{display:flex;gap:14px;flex-wrap:wrap;margin-top:8px}
.numgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:5px;margin-top:10px;max-height:320px;overflow:auto;padding:2px}
.num{padding:6px 0;font-size:14px;font-weight:600}
.num.on{background:var(--navy);border-color:var(--navy);color:#fff}
.num.pil{border:2px solid var(--navy)}
.num.tw{border-style:dashed}
.filter button.on{background:var(--navy);color:#fff}

/* ---- 인강 사이트 모양 ---- */
:root{--navy:#17305a;--blue:#2563eb;--bg:#f5f7fb}
header.gnb{background:#fff;color:var(--ink);padding:0;border-bottom:1px solid var(--line);display:block}
.gnbin{max-width:1180px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.gnb b#home{display:flex;align-items:center;gap:8px;color:var(--navy);font-size:17px;cursor:pointer}
.logo{display:inline-flex;width:28px;height:28px;border-radius:8px;background:var(--blue);color:#fff;align-items:center;justify-content:center;font-size:15px}
.gnb nav{display:flex;gap:4px;flex-wrap:wrap}
.gnb nav a{padding:6px 12px;border-radius:7px;color:var(--ink);text-decoration:none;font-weight:600}
.gnb nav a:hover{background:#eef2f8}
.gnb nav a.on{color:var(--blue);background:#e9f0ff}
.gnb .who{margin-left:auto;font-size:14px;color:var(--sub)}
.gnb button{background:#fff;color:var(--ink);border-color:var(--line);padding:4px 10px;font-size:13px}
#savenote{font-size:13px;color:var(--red)}
main{max-width:1180px}
.foot{max-width:1180px;margin:0 auto;padding:18px 16px 110px;color:var(--sub);font-size:13px;border-top:1px solid var(--line)}
.hero{background:linear-gradient(120deg,#17305a,#2563eb);color:#fff;border-radius:14px;padding:26px 26px 18px;margin-bottom:14px}
.hero h1{margin:0 0 4px;font-size:27px}
.hero p{margin:0 0 16px;opacity:.9}
.gtabs{display:grid;grid-template-columns:repeat(6,1fr);gap:8px}
.gtabs button{background:#ffffff1f;border:1px solid #ffffff40;color:#fff;padding:9px 4px;font-size:17px;font-weight:700;border-radius:9px}
.gtabs button small{display:block;font-size:11.5px;font-weight:400;opacity:.85}
.gtabs button.on{background:#fff;color:var(--navy)}
.selbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px 12px}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.seg button{border:0;border-radius:0;font-weight:600}
.seg button.on{background:var(--navy);color:#fff}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chips button{border-radius:99px;padding:4px 13px;font-size:14px}
.chips button.on{background:var(--blue);border-color:var(--blue);color:#fff;font-weight:700}
.sect{color:var(--navy);font-size:19px;margin:22px 0 10px}
.sect .muted{font-weight:400;margin-left:4px}
.courses{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:14px}
.course{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;color:inherit;text-decoration:none;transition:transform .12s,box-shadow .12s}
.course:hover{transform:translateY(-2px);box-shadow:0 8px 22px #17305a22}
.thumb{height:128px;padding:13px 15px;color:#fff;display:flex;flex-direction:column;justify-content:flex-end;position:relative}
.thumb.hi{background:linear-gradient(135deg,#17305a,#2563eb)}
.thumb.mid{background:linear-gradient(135deg,#0d5c52,#16a085)}
.thumb.fin{filter:hue-rotate(-28deg)}
.thumb .tg{position:absolute;top:12px;left:15px;font-size:12.5px;background:#ffffff2b;border-radius:99px;padding:1px 9px}
.thumb strong{font-size:23px}
.thumb em{font-style:normal;opacity:.92}
.cbody{padding:12px 14px 14px;display:flex;flex-direction:column;gap:3px;flex:1}
.cbody .progress{margin:7px 0 2px}
.enter{margin-top:auto;padding-top:9px;color:var(--blue);font-weight:700;font-size:14px}
.yet{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:10px}
.yetcard{background:#fff;border:1px dashed #b5c0cc;border-radius:10px;padding:12px;display:flex;flex-direction:column;gap:5px;align-items:flex-start}
.linkbtn{display:inline-block;border:1px solid var(--line);background:#fff;color:var(--navy);border-radius:7px;padding:5px 12px;text-decoration:none;font-weight:600;font-size:14px}
.linkbtn.main{background:var(--blue);border-color:var(--blue);color:#fff}
.linkbtn.big{background:#fff;color:var(--navy);border:0;padding:10px 18px;font-size:15.5px;font-weight:800;text-align:center}
.crumb{font-size:13.5px;color:var(--sub);margin-bottom:10px}
.crumb a{color:var(--sub)}
.chero{display:flex;gap:18px;justify-content:space-between;flex-wrap:wrap;background:linear-gradient(120deg,#17305a,#23499c);color:#fff;border-radius:14px;padding:22px 24px;margin-bottom:16px}
.chero .tg{font-size:13px;background:#ffffff2b;border-radius:99px;padding:2px 10px}
.chero h1{margin:8px 0 6px;font-size:25px}
.cmeta{font-size:14px;opacity:.92}
.cside{display:flex;flex-direction:column;gap:7px;min-width:170px;justify-content:center}
.cside button{background:transparent;border-color:#ffffff66;color:#fff}
.leclist{background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.lecrow{display:flex;align-items:center;gap:10px;padding:10px 14px;color:inherit;text-decoration:none;border-top:1px solid var(--line)}
.lecrow:first-child{border-top:0}
.lecrow:hover{background:#f1f5fc}
.lecno{font-weight:700;color:var(--sub);min-width:24px;font-size:13.5px}
.lk{font-size:12px;font-weight:700;border-radius:5px;padding:1px 7px;white-space:nowrap}
.lk.concept{background:#e9f0ff;color:#1d4fc4}
.lk.type{background:#e2f2e9;color:#17603d}
.lk.yeon{background:#fbf2df;color:#6d5213}
.lt{font-weight:600;flex:1;min-width:0}
.ln{white-space:nowrap}
.ready{font-size:12px;color:var(--sub);background:#eef1f5;border-radius:99px;padding:1px 9px;white-space:nowrap}
.player-wrap{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:16px;align-items:start}
.player{aspect-ratio:16/8;background:#101828;color:#fff;border-radius:12px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;text-align:center;padding:16px}
.pbtn{width:64px;height:64px;border-radius:50%;background:#ffffff26;display:flex;align-items:center;justify-content:center;font-size:25px;margin-bottom:4px}
.player span{font-size:14px;opacity:.8;max-width:460px}
.lechead{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin:12px 0}
.lecnav{display:flex;gap:6px;align-items:center}
.numchips{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px}
.numchips button{min-width:42px;font-weight:700;color:var(--navy)}
.playlist{background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden;position:sticky;top:64px}
.plhead{padding:10px 13px;font-weight:700;color:var(--navy);border-bottom:1px solid var(--line);display:flex;justify-content:space-between}
.plbody{max-height:calc(100vh - 130px);overflow:auto}
.plbody a{display:flex;gap:8px;padding:8px 13px;color:inherit;text-decoration:none;font-size:14px;border-top:1px solid #edf0f4}
.plbody a:hover{background:#f1f5fc}
.plbody a.on{background:#e9f0ff;font-weight:700;color:#1d4fc4}
.plbody small{display:block;font-size:12px;color:var(--sub);font-weight:400}
.reqform{display:flex;gap:10px;flex-wrap:wrap;align-items:flex-end}
.reqform label{display:flex;flex-direction:column;gap:3px;font-size:13.5px;color:var(--sub)}
@media (max-width:860px){.player-wrap{grid-template-columns:1fr}.playlist{position:static}.gtabs{grid-template-columns:repeat(3,1fr)}.ln{display:none}}

.thumb.cover{height:auto;padding:12px;background:#eef1f5;align-items:center}
.thumb.cover img{height:230px;width:auto;box-shadow:0 2px 10px #0003;border-radius:3px}
.thumb.prep{background:linear-gradient(135deg,#5b2a86,#9b4dca)}

.pdfbtn{display:inline-block;margin:4px 4px 0 0;padding:6px 12px;border-radius:6px;background:var(--navy,#1f3a5f);color:#fff !important;text-decoration:none;font-weight:600}
/* 강의 영상 */
.vplayer{width:100%;aspect-ratio:16/9;background:#101828;border-radius:12px;display:block}
.vparts{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0 4px}
.vparts button{border:1px solid #c9d3de;background:#fff;border-radius:8px;padding:6px 10px;font-size:14px;cursor:pointer;text-align:left}
.vparts button small{display:block;color:var(--sub);font-size:12px}
.vparts button.on{border-color:var(--navy);background:#eaf1f8;font-weight:700}
.ready.on{background:#e3f4e8;color:#1f7a3d;font-weight:600}
a.slot.vlink{display:block;border-style:solid;border-color:#9fc6a9;color:#1f7a3d;font-weight:600;text-decoration:none}
.outbig{background:#c0392b !important;color:#fff !important;border-color:#c0392b !important;font-weight:700;padding:6px 14px !important}
.vbtn{display:block;width:100%;margin:8px 0 0;padding:7px 10px;border:1px solid #9fc6a9;background:#eef8f0;color:#1f7a3d;border-radius:8px;font-weight:700;font-size:14px;cursor:pointer;text-align:left}
.vmodal{position:fixed;inset:0;background:rgba(10,16,28,.82);display:flex;align-items:center;justify-content:center;z-index:50;padding:16px}
.vmodal-in{width:min(1100px,100%);position:relative}
.vmodal video{width:100%;aspect-ratio:16/9;background:#000;border-radius:10px;display:block}
.vclose{position:absolute;top:-40px;right:0;background:#fff;border:0;border-radius:8px;padding:6px 12px;font-weight:700;cursor:pointer}
.bookbtn{background:#fff7e6 !important;border-color:#e0b860 !important;color:#7a4b00 !important;font-weight:700}
.bk-in{width:min(980px,100%);max-height:94vh;display:flex;flex-direction:column;background:#fff;border-radius:12px;overflow:hidden}
.bk-bar{display:flex;gap:8px;align-items:center;padding:10px 12px;border-bottom:1px solid #e3e8ee;flex-wrap:wrap}
.bk-bar b{margin-right:auto}
.bk-bar button{border:1px solid #c9d3de;background:#fff;border-radius:8px;padding:5px 10px;cursor:pointer;font-weight:600}
.bk-bar button:disabled{opacity:.4;cursor:default}
.bk-pages{overflow:auto;padding:12px;background:#eef1f5;display:flex;flex-direction:column;gap:12px;align-items:center}
.bk-pages img{width:100%;max-width:900px;background:#fff;box-shadow:0 1px 6px rgba(0,0,0,.15);user-select:none}