:root{
  /* Paleta intermedia */
  --bg-body:#0f172a;        /* azul oscuro profundo */
  --bg-surface:#1e293b;     /* pizarra intermedio */
  --line:#334155;           /* divisor sutil */
  --text:#f8fafc;           /* texto principal */
  --muted:#94a3b8;          /* texto secundario */
  --accent:#60a5fa;
}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg-body);color:var(--text)}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.topbar{display:flex;gap:16px;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--line);background:rgba(15,23,42,.92);backdrop-filter:blur(8px);position:sticky;top:0}
.brand{font-weight:700}
.nav{display:flex;flex-wrap:wrap;gap:10px}
.container{max-width:1120px;margin:0 auto;padding:24px}
h1{margin:0 0 12px 0;font-size:22px}
h2{margin:0 0 8px 0;font-size:16px}
.card{background:var(--bg-surface);border:1px solid rgba(51,65,85,.65);border-radius:8px;padding:18px;margin:0 0 24px 0}
.grid{display:grid;grid-template-columns:1fr;gap:12px}
@media(min-width:860px){.grid{grid-template-columns:1fr 1fr}}
label{display:block;margin-top:10px;margin-bottom:6px;color:var(--muted)}
input{width:100%;padding:10px 12px;border-radius:12px;border:1px solid rgba(51,65,85,.85);background:rgba(15,23,42,.9);color:var(--text)}
button{margin-top:12px;padding:10px 14px;border-radius:12px;border:1px solid var(--line);background:#1d4ed8;color:white;cursor:pointer}
button:hover{filter:brightness(1.05)}
.alert{background:#450a0a;border:1px solid #7f1d1d;padding:10px;border-radius:12px;margin:10px 0}
.muted{color:var(--muted)}
ul{margin:8px 0 0 18px}

.btn-small{padding:6px 10px;font-size:12px;border-radius:10px}
.btn-danger{background:#b91c1c;color:#fff}
.btn-success{background:#065f46;color:#fff}

.grid2{display:grid;grid-template-columns:1fr;gap:12px}
@media(min-width:900px){.grid2{grid-template-columns:1fr 1fr}}
.notice{margin-top:12px;padding:12px 14px;border-radius:12px;background:rgba(255,255,255,.05);border:1px solid rgba(51,65,85,.6)}

.table{width:100%;border-collapse:collapse}
.table th,.table td{padding:12px 16px;text-align:left;vertical-align:top}
.table th{font-size:12px;letter-spacing:.02em;text-transform:uppercase;color:var(--muted)}
.table td{color:var(--text)}
/* Borde interno: solo línea inferior sutil por fila */
.table tr{border-bottom:1px solid var(--line)}
.table tr:last-child{border-bottom:none}
.table td small,.table .muted{color:var(--muted)}
.table tbody tr:hover{background:rgba(148,163,184,.06)}

.backbtn{color:var(--text);border:1px solid rgba(51,65,85,.8);padding:6px 10px;border-radius:12px;background:rgba(30,41,59,.55)}
.backbtn:hover{background:rgba(255,255,255,0.06);text-decoration:none}

.section-title{margin:0 0 10px 0;color:var(--text)}