:root{
  --bg:#f4f5f7;--card:#fff;--line:#e3e6ea;--text:#1d2330;--muted:#6b7280;
  --primary:#2456e6;--primary-d:#1b43b8;--danger:#d93b3b;--ok:#1f9d55;--warn:#d98f0f;
  --radius:10px;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--text);font:14px/1.5 -apple-system,"Pretendard","Malgun Gothic","Apple SD Gothic Neo",sans-serif}
a{color:var(--primary);text-decoration:none;cursor:pointer}
button{font:inherit;cursor:pointer;border:1px solid var(--line);background:#fff;color:var(--text);padding:7px 13px;border-radius:8px;transition:.12s}
button:hover{background:#f7f8fa}
button.primary{background:var(--primary);border-color:var(--primary);color:#fff}
button.primary:hover{background:var(--primary-d)}
button.danger{color:var(--danger);border-color:#f1c4c4}
button.danger:hover{background:#fdf2f2}
button.sm{padding:4px 9px;font-size:12.5px;border-radius:6px}
button:disabled{opacity:.5;cursor:default}
input,select,textarea{font:inherit;padding:7px 10px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--text);width:100%}
input:focus,select:focus{outline:2px solid #c7d4fb;border-color:var(--primary)}
label{display:block;font-size:12.5px;color:var(--muted);margin-bottom:4px}
.field{margin-bottom:12px}
.row{display:flex;gap:10px;align-items:center}
.row.wrap{flex-wrap:wrap}
.grow{flex:1}
.muted{color:var(--muted)}
.small{font-size:12.5px}
.right{text-align:right}
.center{text-align:center}
.hide{display:none!important}

/* 상단바 */
.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.topbar .in{max-width:1180px;margin:0 auto;padding:0 20px;height:54px;display:flex;align-items:center;gap:18px}
.brand{font-weight:800;font-size:17px;letter-spacing:-.3px;color:var(--text)}
.brand span{color:var(--primary)}
.topbar nav a{color:var(--muted);padding:6px 10px;border-radius:6px}
.topbar nav a.on,.topbar nav a:hover{color:var(--text);background:#f1f3f6}
.topbar .me{margin-left:auto;display:flex;align-items:center;gap:8px}
.badge{display:inline-block;padding:1px 7px;border-radius:999px;font-size:11.5px;background:#eef2ff;color:var(--primary);font-weight:600}
.badge.gray{background:#f1f3f6;color:var(--muted)}
.badge.ok{background:#e6f6ed;color:var(--ok)}
.badge.warn{background:#fdf3e1;color:var(--warn)}

.page{max-width:1180px;margin:0 auto;padding:22px 20px 60px}
.page h1{font-size:21px;margin:0 0 4px;letter-spacing:-.3px}
.page h2{font-size:16px;margin:0}
.crumb{font-size:13px;color:var(--muted);margin-bottom:8px}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--primary)}
.head{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin-bottom:16px;flex-wrap:wrap}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;margin-bottom:16px}
.card .card-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:16px}
.tabs a{padding:9px 14px;color:var(--muted);border-bottom:2px solid transparent;margin-bottom:-1px;font-weight:500}
.tabs a.on{color:var(--primary);border-color:var(--primary)}
.info-strip{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin-bottom:16px}
.info-strip .it{background:#fff;border:1px solid var(--line);border-radius:8px;padding:10px 12px}
.info-strip .it b{display:block;font-size:12px;color:var(--muted);font-weight:500}
.info-strip .it span{font-size:15px;font-weight:600}

table{width:100%;border-collapse:collapse}
th,td{padding:8px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
th{font-size:12.5px;color:var(--muted);font-weight:600;background:#fafbfc}
tr:hover td{background:#fafbfd}
td.actions{white-space:nowrap;text-align:right}
.empty{padding:36px;text-align:center;color:var(--muted)}

/* 성적 입력 표 */
.grid-wrap{overflow:auto;max-height:70vh;border:1px solid var(--line);border-radius:8px}
.grid{border-collapse:separate;border-spacing:0;font-size:13px}
.grid th,.grid td{padding:0;border-right:1px solid #eef0f3;border-bottom:1px solid #eef0f3;text-align:center;height:30px;min-width:30px}
.grid th{position:sticky;top:0;z-index:2;background:#fafbfc}
.grid th.name,.grid td.name{position:sticky;left:0;z-index:1;background:#fff;text-align:left;padding:0 10px;min-width:110px;font-weight:500}
.grid th.name{z-index:3}
.grid td.cell{cursor:pointer;user-select:none}
.grid td.cell:hover{background:#f0f3ff}
.grid td.cell.x{background:#ffe1e1;color:var(--danger);font-weight:700}
.grid td.cnt{color:var(--muted);min-width:46px}
.grid th.hot{background:#fff1f1;color:var(--danger)}

/* 모달 */
.modal-bg{position:fixed;inset:0;background:rgba(20,24,33,.45);display:flex;align-items:center;justify-content:center;z-index:50;padding:20px}
.modal{background:#fff;border-radius:12px;width:100%;max-width:520px;max-height:92vh;overflow:auto;box-shadow:0 20px 60px rgba(0,0,0,.25)}
.modal.wide{max-width:760px}
.modal .m-head{padding:16px 20px 0;font-size:16px;font-weight:700}
.modal .m-body{padding:14px 20px}
.modal .m-foot{padding:12px 20px 16px;display:flex;justify-content:flex-end;gap:8px}
.check-list{border:1px solid var(--line);border-radius:8px;max-height:260px;overflow:auto}
.check-list label{display:flex;align-items:center;gap:8px;padding:7px 10px;margin:0;color:var(--text);font-size:13.5px;border-bottom:1px solid #f1f3f6;cursor:pointer}
.check-list label:hover{background:#fafbfd}
.check-list input{width:auto}

/* 로그인 */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}
.login{width:100%;max-width:360px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px}
.login .brand{font-size:22px;display:block;margin-bottom:4px}

#toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%);background:#1d2330;color:#fff;padding:10px 16px;border-radius:8px;font-size:13.5px;opacity:0;transition:.2s;pointer-events:none;z-index:99;max-width:90vw}
#toast.show{opacity:1}
#toast.err{background:var(--danger)}
.drop{border:2px dashed #cfd6e2;border-radius:10px;padding:18px;text-align:center;color:var(--muted);cursor:pointer}
.drop:hover,.drop.over{border-color:var(--primary);background:#f6f8ff;color:var(--primary)}
.problem-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:8px}
.problem{border:1px solid var(--line);border-radius:8px;padding:8px 10px;font-size:12.5px;display:flex;gap:8px;align-items:flex-start}
.problem b{font-size:14px;min-width:26px}
.problem .ans{margin-left:auto;white-space:nowrap}
.problem .ans input{width:56px;padding:3px 6px;text-align:center}
.problem .t{color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
@media (max-width:640px){.page{padding:14px 12px 50px}.topbar .in{padding:0 12px}.card{padding:12px}}

.progress{height:10px;background:#eef0f4;border-radius:999px;overflow:hidden;margin:6px 0 4px}
.progress .bar{height:100%;background:var(--primary);transition:width .4s}
textarea{resize:vertical}