:root{
  --bg:#fff;
  --card:#ffffff;
  --muted:#6b7280;
  --text:#111827;
  --line:#5c6370;
  --red:#ef4444;
  --red2:#fb7185;
  --ok:#16a34a;
  --bad:#dc2626;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Arial, Helvetica, sans-serif;
  background: #e9ecf0;
}
.container{max-width:1100px;margin:0 auto;padding:16px}
.topbar{
  position:sticky;top:0;z-index:10;
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar__inner{display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:14px;min-width:0}
.brand__logo{width:56px;height:56px;border-radius:14px;object-fit:contain;background:#000;border:1px solid var(--line)}
.brand__title{font-size:18px;font-weight:700;letter-spacing:.2px}
.brand__subtitle{font-size:13px;color:var(--muted);margin-top:2px}
.badge{font-size:12px;color:#ff0000;border:1px solid var(--line);padding:6px 10px;border-radius:999px}

.card{
  background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.01));
  border:1px solid var(--line);
  border-radius:18px;
  padding:18px;
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
  margin-top:16px;
}
.h1{margin:0 0 12px 0;font-size:22px}
.h2{margin:0;font-size:18px}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
@media(max-width:980px){.grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.grid{grid-template-columns:1fr}}
.field{display:flex;flex-direction:column;gap:6px}
label{font-size:13px;color:var(--muted)}
input,select,textarea{
  font-family: Arial, Helvetica, sans-serif;
  background: rgba(0,0,0,.0);
  border:1px solid var(--line);
  color:var(--text);
  border-radius:12px;
  padding:10px 12px;
  outline:none;
}
select[multiple]{min-height:110px}
input:focus,select:focus,textarea:focus{border-color:rgba(255,0,51,.7);box-shadow:0 0 0 3px rgba(255,0,51,.15)}
.hint{font-size:12px;color:var(--muted)}
.divider{height:1px;background:var(--line);margin:16px 0}
.row{display:flex;align-items:center;gap:12px}
.row--between{justify-content:space-between}
.btn{
  border:1px solid var(--line);
  background: #ff8f8f;
  color:var(--text);
  border-radius:12px;
  padding:10px 12px;
  cursor:pointer;
}
.btn:hover{border-color:rgba(255,0,51,.55)}
.btn.primary{
  background: #fff766;
  border-color: rgba(255,0,51,.7);
  font-weight:700;
}
.btn.primary:disabled{opacity:.5;cursor:not-allowed}
.actions{display:flex;justify-content:flex-end}
.tablewrap{overflow:auto;border-radius:14px;border:1px solid var(--line)}
.table{width:100%;border-collapse:collapse;min-width:900px;background;}
.table th,.table td{padding:20px 10px;border-bottom:1px solid var(--line);vertical-align:top}
.table th{font-size:14px;color:var(--muted);text-align:left;background: #ccffee}
.table td{font-size:13px}
.tag{
  display:inline-flex;align-items:center;gap:8px;
  border:1px solid var(--line);border-radius:999px;
  padding:6px 10px;margin:4px 6px 0 0;font-size:12px
}
.tag.ok{border-color:rgba(46,204,113,.35);color:#c9f5da}
.tag.bad{border-color:rgba(255,77,77,.35);color:#ffd0d0}
.check{display:flex;align-items:flex-start;gap:10px;font-size:13px;color:var(--text)}
.check input{width:18px;height:18px;margin-top:2px}
.msg{margin-top:12px;font-size:13px;color:var(--muted)}
.msg.error{color:#0044ff}
.msg.ok{color:#c9f5da}
.list{margin:10px 0 0 16px;color:var(--muted);font-size:13px}
.modal{
  position:fixed;inset:0;display:none;align-items:center;justify-content:center;
  background: rgba(0,0,0,.85);z-index:1000;padding:16px;
}
.modal.show{display:flex}
.modal__card{
  width:min(860px,100%);
  background: var(--card);
  border:1px solid var(--line);
  border-radius:18px;
  padding:16px;
  box-shadow: 0 20px 70px rgba(0,0,0,.45);
}
.modal__head{display:flex;align-items:center;gap:14px}
.modal__body{margin-top:10px}
.modal__footer{margin-top:14px;display:flex;justify-content:flex-end}
.muted{color:var(--muted);line-height:1.55;margin:0 0 10px 0}


/* Selected students chips */
.selectedStudents{display:flex;flex-wrap:wrap;gap:8px;min-height:22px}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid var(--line);
  background: #b1d3fa;
  font-size:12px;
}
.chip__x{
  width:18px;height:18px;
  border-radius:999px;
  border:1px solid var(--line);
  background: rgba(0,0,0,.35);
  color:var(--text);
  cursor:pointer;
  line-height:1;
  padding:0;
}
.chip__x:hover{border-color:rgba(255,0,51,.55)}
select option{background;color:var(--text)}
select option:checked{background: var(--red); color:#fff;}
select[multiple] option:checked{background: var(--red); color:#fff;}