:root {
  --azul: #1a4d8f;
  --gris: #f4f6f8;
  --borde: #d7dce2;
  --rojo: #b3261e;
  --verde: #1b7a3d;
}
* { box-sizing: border-box; }
body { font-family: system-ui, Arial, sans-serif; margin: 0; background: var(--gris); color: #222; }
.topbar { display: flex; align-items: center; gap: 1.5rem; background: var(--azul); color: #fff; padding: .75rem 1.5rem; flex-wrap: wrap; }
.topbar a { color: #fff; text-decoration: none; margin-right: 1rem; font-size: .95rem; }
.topbar a:hover { text-decoration: underline; }
.brand { font-weight: 700; margin-right: 1rem; }
.userbox { margin-left: auto; display: flex; align-items: center; gap: .75rem; font-size: .9rem; }
.container { max-width: 1100px; margin: 1.5rem auto; padding: 0 1rem 3rem; }
h1, h2, h3 { color: var(--azul); }
table { width: 100%; border-collapse: collapse; background: #fff; margin-bottom: 1.5rem; }
th, td { padding: .5rem .6rem; border-bottom: 1px solid var(--borde); text-align: left; font-size: .92rem; }
th { background: #eef2f7; }
form.card, .card { background: #fff; border: 1px solid var(--borde); border-radius: 6px; padding: 1.2rem; margin-bottom: 1.5rem; max-width: 600px; }
label { display: block; margin: .6rem 0 .2rem; font-size: .88rem; font-weight: 600; }
input, select, textarea { width: 100%; padding: .5rem; border: 1px solid var(--borde); border-radius: 4px; font-size: .95rem; }
button, .btn { display: inline-block; background: var(--azul); color: #fff; border: none; padding: .55rem 1.1rem; border-radius: 4px; cursor: pointer; font-size: .9rem; text-decoration: none; margin-top: .8rem; }
button:hover, .btn:hover { opacity: .9; }
.btn-danger { background: var(--rojo); }
.btn-secundario { background: #667; }
.alerta { padding: .7rem 1rem; border-radius: 4px; margin-bottom: 1rem; font-size: .9rem; }
.alerta-error { background: #fdecea; color: var(--rojo); border: 1px solid #f5c6c3; }
.alerta-exito { background: #eaf7ed; color: var(--verde); border: 1px solid #c3e6cb; }
.login-box { max-width: 380px; margin: 4rem auto; background: #fff; padding: 2rem; border-radius: 8px; border: 1px solid var(--borde); }
.arbol ul { list-style: none; padding-left: 1.2rem; }
.tag { display: inline-block; background: #eef2f7; border-radius: 3px; padding: .1rem .5rem; font-size: .8rem; margin-left: .4rem; }