:root {
    --azul: #1F4E78;
    --azul-claro: #2E75B6;
    --amarillo: #FFF2CC;
    --verde: #2e7d32;
    --rojo: #c00000;
    --gris: #666;
    --borde: #d9d9d9;
    --fondo: #f4f6f8;
}
* { box-sizing: border-box; }
body {
    font-family: Arial, Helvetica, sans-serif;
    background: var(--fondo);
    margin: 0;
    color: #222;
}
.login-body {
    display: flex; align-items: center; justify-content: center;
    height: 100vh;
}
.login-box {
    background: #fff; padding: 40px; border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,.08); width: 320px; text-align: center;
}
.login-box h1 { color: var(--azul); margin-bottom: 0; font-size: 22px; }
.login-logo { max-width: 180px; height: auto; margin-bottom: 4px; }
.subtitle { color: var(--gris); margin-top: 4px; margin-bottom: 24px; }
.login-box label { display: block; text-align: left; font-size: 13px; margin: 12px 0 4px; color: var(--gris); }
.login-box input { width: 100%; padding: 10px; border: 1px solid var(--borde); border-radius: 6px; font-size: 15px; }
.login-box button {
    width: 100%; margin-top: 20px; padding: 12px; background: var(--azul);
    color: #fff; border: none; border-radius: 6px; font-size: 15px; cursor: pointer;
}
.login-box button:hover { background: var(--azul-claro); }

.alert { padding: 10px; border-radius: 6px; margin-bottom: 12px; font-size: 14px; }
.alert-error { background: #fdecea; color: var(--rojo); }
.alert-success { background: #e8f5e9; color: var(--verde); }

header.topbar {
    background: var(--azul); color: #fff; padding: 14px 20px;
    display: flex; justify-content: space-between; align-items: center;
    flex-wrap: wrap;
}
header.topbar h1 { font-size: 18px; margin: 0; }
.topbar-logo { height: 42px; width: auto; background: #fff; padding: 3px 8px; border-radius: 4px; }
header.topbar nav a {
    color: #fff; text-decoration: none; margin-left: 16px; font-size: 14px;
    padding: 6px 10px; border-radius: 4px;
}
header.topbar nav a:hover, header.topbar nav a.active { background: rgba(255,255,255,.15); }
header.topbar .userinfo { font-size: 13px; opacity: .9; }

main { max-width: 1200px; margin: 20px auto; padding: 0 16px; }

.card {
    background: #fff; border-radius: 8px; padding: 20px; margin-bottom: 20px;
    box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.card h2 { margin-top: 0; color: var(--azul); font-size: 17px; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 8px 10px; border-bottom: 1px solid var(--borde); text-align: left; }
th { background: var(--azul-claro); color: #fff; font-weight: 600; position: sticky; top: 0; }
tr:hover { background: #f9fafb; }
.table-wrap { overflow-x: auto; }

.badge { padding: 3px 8px; border-radius: 10px; font-size: 12px; font-weight: bold; }
.badge-pagado { background: #e8f5e9; color: var(--verde); }
.badge-credito { background: #fdecea; color: var(--rojo); }
.badge-parcial { background: #fff8e1; color: #b8860b; }

.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
.form-grid label { font-size: 13px; color: var(--gris); display: block; margin-bottom: 4px; }
.form-grid input, .form-grid select, .form-grid textarea {
    width: 100%; padding: 8px; border: 1px solid var(--borde); border-radius: 5px; font-size: 14px;
}
.btn {
    display: inline-block; background: var(--azul); color: #fff; border: none;
    padding: 10px 18px; border-radius: 6px; font-size: 14px; cursor: pointer; text-decoration: none;
}
.btn:hover { background: var(--azul-claro); }
.btn-secondary { background: #888; }
.btn-danger { background: var(--rojo); }
.btn-sm { padding: 5px 10px; font-size: 12px; }

.kpi-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; margin-bottom: 20px; }
.kpi { background: #fff; border-radius: 8px; padding: 16px; box-shadow: 0 1px 4px rgba(0,0,0,.06); }
.kpi .value { font-size: 24px; font-weight: bold; color: var(--azul); }
.kpi .label { font-size: 12px; color: var(--gris); text-transform: uppercase; }

.filters { display: flex; gap: 10px; align-items: end; flex-wrap: wrap; margin-bottom: 16px; }
.filters label { font-size: 13px; color: var(--gris); display: block; margin-bottom: 4px; }
.filters input, .filters select { padding: 8px; border: 1px solid var(--borde); border-radius: 5px; }

.vencida { color: var(--rojo); font-weight: bold; }
.muted { color: var(--gris); font-size: 13px; }

.print-doc { background: #fff; padding: 30px; max-width: 750px; margin: 0 auto; }
.print-doc h2 { text-align: center; color: var(--azul); margin-bottom: 4px; }
.print-doc .doc-sub { text-align: center; color: var(--gris); margin-bottom: 20px; }
.print-doc table { margin-bottom: 10px; }
.firma-row { display: flex; justify-content: space-between; margin-top: 60px; }
.firma-box { text-align: center; width: 45%; }
.firma-line { border-top: 1px solid #333; margin-top: 40px; padding-top: 6px; font-size: 13px; }
.total-box { background: var(--azul); color: #fff; padding: 14px; border-radius: 6px; text-align: center; font-size: 20px; font-weight: bold; margin: 16px 0; }
@media print {
    header.topbar, .no-print { display: none !important; }
    body { background: #fff; }
    main { margin: 0; max-width: 100%; }
    .card { box-shadow: none; }
}