:root { --sidebar-w: 250px; --marca: #1f4e79; --marca-claro: #e8f0f8; }
body { background: #f4f6f9; font-size: .95rem; }
.sidebar { width: var(--sidebar-w); min-height: 100vh; background: #16324f; position: fixed; top: 0; left: 0; overflow-y: auto; z-index: 1030; transition: transform .2s; }
.sidebar .brand { color: #fff; padding: 1rem 1.25rem; font-weight: 600; border-bottom: 1px solid rgba(255,255,255,.1); display: block; text-decoration: none; }
.sidebar .brand small { display: block; font-weight: 400; color: #9fb6cf; font-size: .75rem; }
.sidebar .seccion { color: #7f9bb8; font-size: .7rem; text-transform: uppercase; letter-spacing: .06em; padding: 1rem 1.25rem .35rem; }
.sidebar .nav-link { color: #d4e1ee; padding: .45rem 1.25rem; border-left: 3px solid transparent; }
.sidebar .nav-link:hover { background: rgba(255,255,255,.06); color: #fff; }
.sidebar .nav-link.active { background: rgba(255,255,255,.1); color: #fff; border-left-color: #5fa8e8; }
.sidebar .nav-link i { width: 1.4rem; display: inline-block; }
.contenido { margin-left: var(--sidebar-w); min-height: 100vh; }
.topbar { background: #fff; border-bottom: 1px solid #e3e7ec; padding: .6rem 1.5rem; position: sticky; top: 0; z-index: 1020; }
.card { border: 1px solid #e3e7ec; box-shadow: 0 1px 2px rgba(0,0,0,.03); }
.card-header { background: #fff; font-weight: 600; }
.tile { display: block; text-decoration: none; color: inherit; border-radius: .5rem; transition: transform .1s, box-shadow .1s; }
.tile:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,.08); }
.tile .icono { font-size: 1.8rem; color: var(--marca); }
.stat { font-size: 1.9rem; font-weight: 700; color: var(--marca); }
.table thead th { background: #f8fafc; font-weight: 600; font-size: .85rem; white-space: nowrap; }
.foto-alumno { width: 140px; height: 160px; object-fit: cover; border-radius: .4rem; border: 1px solid #dde; background: #f0f2f5; }
.foto-mini { width: 36px; height: 36px; object-fit: cover; border-radius: 50%; }
/* Grilla de horarios */
.grilla th, .grilla td { text-align: center; vertical-align: middle; font-size: .8rem; }
.grilla td.celda { height: 58px; min-width: 130px; position: relative; }
.grilla td.celda.vacia { cursor: pointer; color: #b8c2cc; }
.grilla td.celda.vacia:hover { background: var(--marca-claro); color: var(--marca); }
.grilla .bloque-materia { font-weight: 600; line-height: 1.15; }
.grilla .bloque-prof { font-size: .72rem; color: #555; }
.grilla .bloque-aula { font-size: .68rem; }
.grilla tr.recreo td { background: #fafafa; font-size: .7rem; color: #999; padding: 2px; }
.grilla tr.recreo td + td { letter-spacing: .5em; }
.grilla .btn-quitar { position: absolute; top: 2px; right: 2px; padding: 0 .25rem; font-size: .7rem; display: none; }
.grilla td.celda:hover .btn-quitar { display: inline-block; }
.notas-input { width: 64px; text-align: center; padding: .15rem .25rem; }
.asis-opt .btn { min-width: 38px; }
@media (max-width: 991.98px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.abierta { transform: none; }
  .contenido { margin-left: 0; }
}
@media print {
  .sidebar, .topbar, .no-print, .btn, form.filtros, nav[aria-label] { display: none !important; }
  .contenido { margin: 0 !important; }
  body { background: #fff; font-size: 11pt; }
  .card { border: none; box-shadow: none; }
  .grilla td.celda { height: auto; }
  a { text-decoration: none; color: #000; }
}

/* Crédito del desarrollador (sidebar) y pie de página */
.sidebar { display: flex; flex-direction: column; height: 100vh; }
.sidebar nav { flex: 1 0 auto; }
.credito-dev { padding: .9rem 1.25rem 1.1rem; font-size: .72rem; line-height: 1.35; color: rgba(255,255,255,.32); border-top: 1px solid rgba(255,255,255,.07); text-align: center; letter-spacing: .03em; user-select: none; }
.credito-dev strong { font-weight: 600; color: rgba(255,255,255,.45); }
.contenido { display: flex; flex-direction: column; }
.contenido > main { flex: 1 0 auto; }
.pie-sitio { text-align: center; font-size: .8rem; color: #8a94a3; padding: 1rem; border-top: 1px solid rgba(0,0,0,.06); }