:root {
    --bg: #0d1b2a;
    --panel: #1b263b;
    --accent: #4895ef;
    --ok: #2ecc71;
    --bad: #e74c3c;
    --text: #e0e1dd;
    --muted: #8d99ae;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Segoe UI", system-ui, sans-serif;
    background: #f4f6fb;
    color: #1b263b;
}

.page { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
    width: 220px;
    background: var(--bg);
    color: var(--text);
    padding: 1rem 0;
    flex-shrink: 0;
}
.brand { font-size: 1.5rem; font-weight: 700; padding: 0 1.25rem 1rem; color: var(--accent); }
.nav-item {
    display: block; padding: .7rem 1.25rem; color: var(--text);
    text-decoration: none; border-left: 3px solid transparent;
}
.nav-item:hover { background: var(--panel); }
.nav-item.active { background: var(--panel); border-left-color: var(--accent); }

main { flex: 1; display: flex; flex-direction: column; }
.top-row {
    display: flex; justify-content: flex-end; align-items: center; gap: 1rem;
    padding: .75rem 1.5rem; background: #fff; border-bottom: 1px solid #e0e4ee;
}
.usuario { color: var(--muted); }
.content { padding: 1.5rem; }

h1 { font-size: 1.6rem; margin-top: 0; }

/* Tarjetas KPI */
.tarjetas { display: flex; gap: 1rem; margin-bottom: 1rem; }
.tarjeta {
    background: #fff; border-radius: 10px; padding: 1.25rem 1.5rem;
    box-shadow: 0 1px 4px rgba(0,0,0,.08); min-width: 130px;
}
.tarjeta .num { font-size: 2rem; font-weight: 700; }
.tarjeta.ok .num { color: var(--ok); }
.tarjeta.bad .num { color: var(--bad); }
.hint { color: var(--muted); font-size: .85rem; }

/* Tablas */
.tabla { width: 100%; border-collapse: collapse; background: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 1px 4px rgba(0,0,0,.06); }
.tabla th, .tabla td { padding: .6rem .8rem; text-align: left; border-bottom: 1px solid #eef1f7; font-size: .9rem; }
.tabla th { background: #eef2fb; font-weight: 600; }
.tabla .titulo { max-width: 340px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.vacio { text-align: center; color: var(--muted); padding: 1.5rem; }

.badge { padding: .2rem .5rem; border-radius: 20px; font-size: .8rem; font-weight: 600; }
.badge.on { background: #d4f6e2; color: #1b7a45; }
.badge.off { background: #fbe0dd; color: #a4342a; }

/* Formularios */
.form-inline { display: flex; gap: .5rem; margin-bottom: 1rem; flex-wrap: wrap; }
.input { padding: .5rem .7rem; border: 1px solid #c9d2e3; border-radius: 6px; font-size: .9rem; }
.campo { margin-bottom: .8rem; display: flex; flex-direction: column; gap: .3rem; }

.btn-primary { background: var(--accent); color: #fff; border: 0; padding: .5rem 1rem; border-radius: 6px; cursor: pointer; font-weight: 600; }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }
.btn-danger { background: transparent; color: var(--bad); border: 1px solid var(--bad); padding: .3rem .6rem; border-radius: 6px; cursor: pointer; font-size: .8rem; }
.btn-link { background: none; border: 0; color: var(--accent); cursor: pointer; text-decoration: underline; font-size: .85rem; }

.clave-box { background: #fff9e6; border: 1px solid #f0d98a; padding: 1rem; border-radius: 8px; margin-bottom: 1rem; }
.clave { font-family: monospace; font-size: 1rem; background: #1b263b; color: #7ee787; padding: .5rem .8rem; border-radius: 6px; margin-top: .5rem; word-break: break-all; }

.paginador { display: flex; align-items: center; gap: .5rem; margin-top: 1rem; justify-content: center; flex-wrap: wrap; }
.pag-info { color: var(--muted); font-size: .85rem; margin: 0 .5rem; }
.btn-pag {
    background: #fff; border: 1px solid #c9d2e3; color: #1b263b;
    padding: .4rem .7rem; border-radius: 6px; cursor: pointer; font-size: .85rem;
}
.btn-pag:hover:not(:disabled) { background: #eef2fb; border-color: var(--accent); }
.btn-pag:disabled { opacity: .45; cursor: not-allowed; }
.filtro-label { align-self: center; color: var(--muted); font-size: .85rem; }

/* Login */
.login-box {
    max-width: 340px; margin: 8vh auto; background: #fff; padding: 2rem;
    border-radius: 12px; box-shadow: 0 4px 20px rgba(0,0,0,.12);
}
.login-box h1 { color: var(--accent); margin: 0; text-align: center; }
.login-box .sub { text-align: center; color: var(--muted); margin-top: .2rem; }
.login-box .input { width: 100%; }
.login-box .btn-primary { width: 100%; margin-top: .5rem; }
.error { color: var(--bad); font-size: .85rem; margin: .5rem 0; }