:root{
  --bg:#f4f6f9; --panel:#fff; --line:#e3e7ee; --text:#1d2433; --sub:#6b7486;
  --brand:#1f4e78; --brand-soft:#e8eff7;
  --ok:#1e8e5a; --ok-bg:#e3f5ec; --late:#b7791f; --late-bg:#fdf3dc;
  --none:#c53030; --none-bg:#fde8e8; --warn:#7b3fc4; --warn-bg:#f1e9fb;
  --re:#2b6cb0; --re-bg:#e5effa;
}
*{box-sizing:border-box}
body{margin:0;font-family:"Noto Sans KR",system-ui,-apple-system,"Malgun Gothic",sans-serif;background:var(--bg);color:var(--text);font-size:14px}
a{color:var(--brand);text-decoration:none;cursor:pointer}
button{font:inherit;cursor:pointer}
code{background:#eef1f5;border-radius:4px;padding:1px 5px;font-size:12px}

.app{display:flex;min-height:100vh}
.side{width:220px;background:var(--brand);color:#dbe7f3;flex-shrink:0;display:flex;flex-direction:column}
.logo{padding:20px 18px 14px;font-weight:700;font-size:16px;color:#fff}
.nav a{display:flex;align-items:center;gap:10px;padding:10px 18px;color:#dbe7f3;border-left:3px solid transparent}
.nav a:hover{background:rgba(255,255,255,.07)}
.nav a.on{background:rgba(255,255,255,.14);color:#fff;border-left-color:#fbd38d;font-weight:500}
.side-foot{margin-top:auto;padding:14px 18px;font-size:12px;color:#9fb9d3}
.side-foot button{background:none;border:0;color:#cfe0f1;padding:0;text-decoration:underline}
.main{flex:1;min-width:0;padding:24px 28px 60px}
.top{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:18px}
.top h1{font-size:21px;margin:0}
.top .crumb{color:var(--sub);font-size:13px}
.top .right{margin-left:auto;display:flex;gap:8px;flex-wrap:wrap}
.btn.menu-btn{display:none}
.drawer-bg{display:none}

.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px;min-width:0}
.card h2{font-size:15px;margin:0 0 12px;display:flex;align-items:center;gap:8px}
.card h2 .more{margin-left:auto;font-size:12px;font-weight:400}
.grid{display:grid;gap:16px}
.grid>*{min-width:0}
.g4{grid-template-columns:repeat(4,1fr)}
.g2{grid-template-columns:1.4fr 1fr}
.g2e{grid-template-columns:1fr 1fr}
.mt{margin-top:16px}
.kpi .n{font-size:28px;font-weight:700;margin-top:4px}
.kpi .l{color:var(--sub);font-size:13px}
.kpi .s{font-size:12px;color:var(--sub);margin-top:2px}
.btn{display:inline-block;border:1px solid var(--line);background:#fff;border-radius:8px;padding:7px 13px;color:var(--text)}
.btn:hover{background:#f7f9fc}
.btn.pri{background:var(--brand);color:#fff;border-color:var(--brand)}
.btn.danger{color:var(--none)}
.btn.sm{padding:4px 9px;font-size:12px}
.btn.full{width:100%;text-align:center}
.sel,.inp{border:1px solid var(--line);border-radius:8px;padding:8px 10px;background:#fff;font:inherit;max-width:100%}
.inp{width:100%}
textarea.inp{display:block;resize:vertical}
label.f{display:block;font-size:12px;color:var(--sub);margin:12px 0 5px}
.help{font-size:12px;color:var(--sub);margin-top:4px}
.muted{color:var(--sub)}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.tag{display:inline-flex;align-items:center;gap:4px;border-radius:6px;padding:2px 8px;font-size:12px;font-weight:500;white-space:nowrap}
.t-ok{background:var(--ok-bg);color:var(--ok)} .t-late{background:var(--late-bg);color:var(--late)}
.t-none{background:var(--none-bg);color:var(--none)} .t-re{background:var(--re-bg);color:var(--re)}
.t-todo,.t-future{background:#edf0f4;color:#4a5568}
table{border-collapse:collapse;width:100%}
th,td{padding:9px 10px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap}
th{font-size:12px;color:var(--sub);font-weight:500;background:#fafbfd}
.tbl-wrap{overflow-x:auto}
.bar{height:8px;background:#edf0f4;border-radius:4px;overflow:hidden;min-width:80px}
.bar i{display:block;height:100%;background:var(--ok)}
.bar.mid i{background:var(--late)} .bar.low i{background:var(--none)}
.legend{display:flex;gap:8px;flex-wrap:wrap;font-size:12px}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px;align-items:center}
.feed{list-style:none;margin:0;padding:0}
.feed li{display:flex;gap:10px;align-items:center;padding:8px 0;border-bottom:1px dashed var(--line)}
.feed li:last-child{border:0}
.feed .time{color:var(--sub);font-size:12px;margin-left:auto;white-space:nowrap}
.flash{border-radius:10px;padding:10px 14px;margin-bottom:14px;font-size:13px}
.flash.ok{background:var(--ok-bg);color:var(--ok)} .flash.err{background:var(--none-bg);color:var(--none)}
.flash.info{background:#fffbea;color:#744210;border:1px solid #f6e3a1}
.empty{text-align:center;color:var(--sub);padding:30px 10px}

.mx td,.mx th{text-align:center}
.mx td:nth-child(-n+2),.mx th:nth-child(-n+2){text-align:left}
.cell{display:inline-flex;width:34px;height:28px;align-items:center;justify-content:center;border-radius:6px;font-size:13px}
.c-ok{background:var(--ok-bg);color:var(--ok)} .c-late{background:var(--late-bg);color:var(--late)}
.c-none{background:var(--none-bg);color:var(--none)} .c-re{background:var(--re-bg);color:var(--re)}
.c-todo{background:#f2f4f7;color:#8a94a6} .c-future{background:#f7f8fa;color:#c3c9d3}
a.cell:hover{outline:2px solid var(--brand)}

.url{font-family:ui-monospace,Consolas,monospace;font-size:12px;background:#f4f6f9;padding:6px 8px;border-radius:6px;word-break:break-all;display:block}
.qr{width:150px;height:150px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:6px}
.anchor{scroll-margin-top:20px}

/* 학생 페이지 */
.stu{min-height:100vh;display:flex;justify-content:center;padding:30px 16px 60px;background:linear-gradient(180deg,#e8eff7,#f4f6f9 240px)}
.stu .box{width:100%;max-width:520px}
.stu h1{font-size:22px;margin:0 0 4px}
.steps{display:flex;gap:6px;margin-bottom:16px}
.steps div{flex:1;height:5px;border-radius:3px;background:#dfe5ee}
.steps div.on{background:var(--brand)}
.msg{border-radius:8px;padding:8px 12px;font-size:13px;margin-top:8px}
.msg.ok{background:var(--ok-bg);color:var(--ok)} .msg.err{background:var(--none-bg);color:var(--none)}
.msg.late{background:var(--late-bg);color:var(--late)}
.drop{display:block;border:2px dashed #b9c6d8;border-radius:12px;padding:22px;text-align:center;color:var(--sub);background:#fafcff;cursor:pointer}
.drop .big{font-size:30px}
.flist{list-style:none;margin:8px 0 0;padding:0}
.flist li{display:flex;align-items:center;gap:10px;padding:9px 0;border-bottom:1px solid var(--line);font-size:13px}
.flist li>div{flex:1;min-width:0;overflow-wrap:anywhere}
.summary{background:#f7f9fc;border-radius:10px;padding:14px;display:grid;grid-template-columns:80px 1fr;gap:8px 12px;font-size:14px}
.summary>*{min-width:0;overflow-wrap:anywhere}
.summary .k{color:var(--sub)}
.receipt{text-align:center}
.receipt .ck{width:64px;height:64px;border-radius:50%;background:var(--ok-bg);color:var(--ok);font-size:34px;display:flex;align-items:center;justify-content:center;margin:0 auto 12px}
.result li{display:flex;align-items:center;gap:10px;padding:12px 0;border-bottom:1px solid var(--line)}
.progress{height:8px;background:#e3e7ee;border-radius:4px;overflow:hidden;margin-top:12px;display:none}
.progress i{display:block;height:100%;width:0;background:var(--brand);transition:width .2s}
.hidden{display:none!important}

@media (max-width:900px){
  .g4{grid-template-columns:1fr 1fr} .g2,.g2e{grid-template-columns:1fr}
  .side{position:fixed;left:-240px;top:0;bottom:0;z-index:20;transition:left .2s;width:230px}
  .side.open{left:0}
  .drawer-bg.open{display:block;position:fixed;inset:0;background:rgba(0,0,0,.3);z-index:15}
  .btn.menu-btn{display:inline-block}
  .main{padding:16px}
  .card{overflow-x:auto}
}

/* 수정·삭제 펼침 */
details.edit{display:inline-block;position:relative;text-align:left}
details.edit>summary{list-style:none}
details.edit>summary::-webkit-details-marker{display:none}
details.edit[open]>summary{background:var(--brand-soft)}
details.edit .editbox{margin-top:8px;min-width:240px}
details.edit[open]{display:block;background:#fafbfd;border:1px solid var(--line);border-radius:10px;padding:8px 10px;margin:4px 0}
.btn.danger{border-color:#f3c6c6}