:root {
  --rojo: #c8102e;
  --rojo-oscuro: #9b0c23;
  --fondo: #f4f5f7;
  --texto: #1d1d1f;
  --suave: #6b6b70;
  --borde: #e2e2e6;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--fondo); color: var(--texto);
  display: flex; min-height: 100vh; line-height: 1.5;
}
a { color: var(--rojo); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Menú lateral ---- */
.menu {
  width: 220px; flex-shrink: 0; background: #1d1d1f; color: #fff;
  display: flex; flex-direction: column; padding: 20px 0;
  position: sticky; top: 0; height: 100vh;
}
.marca { font-weight: 800; font-size: 1.3rem; color: #fff; padding: 0 20px 18px; letter-spacing: 1px; }
.marca span { color: var(--rojo); font-weight: 600; font-size: .9rem; }
.marca.grande { font-size: 1.8rem; color: var(--texto); text-align: center; padding: 0 0 10px; }
.menu nav { display: flex; flex-direction: column; flex: 1; }
.menu nav a { color: #c9c9ce; padding: 11px 20px; font-size: .95rem; }
.menu nav a:hover { background: #2b2b2f; color: #fff; text-decoration: none; }
.menu nav a.activo { background: var(--rojo); color: #fff; font-weight: 600; }
.pie-menu { padding: 14px 20px; border-top: 1px solid #333; font-size: .85rem; }
.pie-menu span { display: block; color: #888; margin-bottom: 4px; }
.pie-menu a { color: #ddd; }

/* ---- Contenido ---- */
main { flex: 1; padding: 28px 32px; max-width: 1100px; }
main h1 { font-size: 1.5rem; margin-bottom: 18px; }
main h2 { font-size: 1.1rem; margin: 18px 0 10px; }
section { margin-bottom: 26px; }
.suave { color: var(--suave); font-size: .9rem; }

/* ---- Tarjetas resumen ---- */
.tarjetas-resumen { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; margin-bottom: 10px; }
.resumen { background: #fff; border: 1px solid var(--borde); border-radius: 10px; padding: 16px; font-size: .85rem; color: var(--suave); }
.resumen .numero { display: block; font-size: 1.6rem; font-weight: 700; color: var(--texto); }
.resumen small { color: var(--rojo); font-weight: 600; }

.dos-columnas { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 900px) { .dos-columnas { grid-template-columns: 1fr; } }

/* ---- Paneles y formularios ---- */
.panel { background: #fff; border: 1px solid var(--borde); border-radius: 10px; padding: 18px 20px; }
.grilla-form { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.ancho-total { grid-column: 1 / -1; }
label { display: flex; flex-direction: column; font-size: .85rem; color: var(--suave); gap: 4px; }
input, select, textarea {
  font: inherit; padding: 8px 10px; border: 1px solid var(--borde);
  border-radius: 6px; background: #fff; color: var(--texto); width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--rojo); outline-offset: -1px; }
button {
  font: inherit; font-weight: 600; background: var(--rojo); color: #fff;
  border: none; border-radius: 6px; padding: 9px 18px; cursor: pointer;
}
button:hover { background: var(--rojo-oscuro); }
button.peligro { background: transparent; color: #b00; padding: 2px 6px; font-weight: 500; font-size: .85rem; }
button.peligro:hover { text-decoration: underline; background: transparent; }
.boton-suave { display: inline-block; margin-left: 8px; padding: 9px 14px; color: var(--suave); }

/* ---- Tablas ---- */
table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--borde); border-radius: 10px; overflow: hidden; font-size: .9rem; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--borde); }
th { background: #fafafa; font-size: .8rem; text-transform: uppercase; letter-spacing: .4px; color: var(--suave); }
tr:last-child td { border-bottom: none; }
.acciones { white-space: nowrap; }
.acciones form { display: inline; }
.acciones a { margin-right: 8px; font-size: .85rem; }
.en-linea { display: flex; gap: 6px; }
.en-linea input { width: 160px; }

/* ---- Avisos ---- */
.aviso { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; font-size: .9rem; }
.aviso.ok { background: #e6f6ea; color: #1b6b32; border: 1px solid #bfe5c9; }
.aviso.error { background: #fdebec; color: #9b1c28; border: 1px solid #f3c2c7; }

/* ---- Login ---- */
body.centrado { display: flex; align-items: center; justify-content: center; padding: 20px; }
.caja-login {
  background: #fff; border: 1px solid var(--borde); border-radius: 14px;
  padding: 34px 30px; width: 100%; max-width: 400px;
  box-shadow: 0 8px 30px rgba(0,0,0,.06);
}
.caja-login h2 { margin-bottom: 6px; }
.caja-login p { margin-bottom: 14px; }
.caja-login form { display: flex; flex-direction: column; gap: 12px; margin-top: 10px; }

/* ---- Responsive menú ---- */
@media (max-width: 760px) {
  body { flex-direction: column; }
  .menu { width: 100%; height: auto; position: static; flex-direction: row; flex-wrap: wrap; align-items: center; padding: 10px; }
  .marca { padding: 0 12px; }
  .menu nav { flex-direction: row; flex-wrap: wrap; }
  .menu nav a { padding: 8px 10px; }
  .pie-menu { border: none; padding: 8px 12px; }
  main { padding: 18px; }
}