body { background: #f4f6fa; }
.card { border: 0; border-radius: .75rem; }
.navbar .nav-link.active { font-weight: 600; text-decoration: underline; text-underline-offset: 6px; }
.stat-card .stat { font-size: 2rem; font-weight: 700; line-height: 1; }
.table thead th { white-space: nowrap; }
.table td { vertical-align: middle; }
tr.overdue td { background: #fff4f4; }
tr.done td { background: #f2fbf4; }
.comment-input { min-width: 14rem; }
.form-control-lg.enroll { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .05em; }
.student-pick label { cursor: pointer; }
.student-pick .form-check { padding: .35rem .5rem .35rem 2rem; border-radius: .4rem; }
.student-pick .form-check:hover { background: #eef2f8; }
.sticky-actions { position: sticky; bottom: 0; background: #fff; border-top: 1px solid #e5e7eb; padding: .75rem 0; }
@media print { nav, footer, .no-print { display: none !important; } }