:root{--bg:#f4f7fb;--card:#fff;--accent:#2d6cdf}
body{font-family:Inter,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);margin:0;padding:20px}
.container{max-width:1100px;margin:0 auto}
header{display:flex;flex-direction:column;gap:6px}
header h1{margin:0;color:#0b2545}
.columns{display:flex;gap:20px;margin-top:18px}
.card{background:var(--card);padding:16px;border-radius:10px;box-shadow:0 6px 18px rgba(20,30,60,0.05);flex:1}
form{display:flex;flex-wrap:wrap;gap:8px}
form input, form select{padding:8px;border:1px solid #d6dbe8;border-radius:6px;flex:1 1 45%}
form button{background:var(--accent);color:#fff;border:none;padding:8px 12px;border-radius:6px;cursor:pointer}
#students-list{margin-top:12px}
.student-item{padding:8px;border-bottom:1px solid #f0f3f9;display:flex;justify-content:space-between;align-items:center}
.mini-card{margin-top:12px;padding:10px;border-radius:8px;background:#fbfdff}
footer{text-align:center;margin-top:18px;color:#6b7893}
@media(max-width:900px){.columns{flex-direction:column}}
/* Modal overlay & content */
.modal { 
  position: fixed;
  inset: 0;
  display: none; /* show via JS by setting display:block or adding .open */
  align-items: center;
  justify-content: center;
  z-index: 1200;
  font-family: inherit;
}

/* dimmed backdrop */
.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(5, 12, 25, 0.55);
  backdrop-filter: blur(2px);
  transition: opacity .18s ease;
}

/* centered card */
.modal-content {
  position: relative;
  width: min(720px, 92%);
  max-height: 85vh;
  overflow: auto;
  background: var(--card);
  border-radius: 12px;
  box-shadow: 0 18px 40px rgba(10,20,40,0.25);
  padding: 14px;
  z-index: 1201;
  transform: translateY(6px);
  transition: transform .18s ease, opacity .18s ease;
}

/* header */
.modal-header {
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding-bottom:8px;
  border-bottom:1px solid #f0f3f9;
}
.modal-header h3 { margin:0; font-size:1.05rem; color:var(--accent); }

/* close button (top-right) */
.modal-close {
  background:transparent;
  border:none;
  font-size:22px;
  line-height:1;
  cursor:pointer;
  color:#6b7893;
  padding:6px;
  border-radius:8px;
}
.modal-close:hover { background:#f5f7fb; color:#2d6cdf; }

/* body */
.modal-body { padding:12px 6px; color:#0b2545; font-size:0.96rem; }
.modal-body p { margin:6px 0; }
.modal-body .meta { color:#6b7893; font-size:0.9rem; margin-bottom:8px; }

/* footer */
.modal-footer { padding-top:8px; border-top:1px solid #f0f3f9; text-align:right; }
.btn { background:var(--accent); color:#fff; border:none; padding:8px 12px; border-radius:8px; cursor:pointer; }

/* show state */
.modal.open { display:flex; }