:root{
  --bg-main:#f0f4f8;
  --bg-card:#ffffff;
  --primary:#0d1b2a;
  --accent:#1b9aaa;
  --accent-light:#8ecae6;
  --text:#020c1b;
  --muted:#415a77;
  --header-h:58px;
}

body{
  background:var(--bg-main);
  color:var(--text);
  font-family:"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  padding-top:var(--header-h);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* HEADER */
.top-header{
  height:var(--header-h);
  background:var(--primary);
  color:#fff;
  position:fixed;
  top:0;left:0;right:0;
  z-index:1030;
  display:flex;
  align-items:center;
  padding:0 1.25rem;
  box-shadow:0 2px 6px rgba(0,0,0,.18);
}

.brand{font-size:1.15rem;font-weight:600;letter-spacing:.5px;}

/* BOTONES HEADER */
.btn-header{
  font-size:.9rem;
  padding:.35rem .7rem;
  margin-left:.25rem;
}

/* CARDS & UI COMPONENTS */
.ui-card{
  border:none;
  border-radius:.85rem;
  background:var(--bg-card);
  box-shadow:0 5px 14px rgba(11,19,43,.07);
  overflow:hidden;
}

.ui-header{
  background:linear-gradient(135deg,var(--primary),var(--accent));
  color:#fff;
  border-radius:.85rem .85rem 0 0;
  padding:.8rem 1rem;
}

.ui-header h6{font-size:.9rem;margin:0;}

.btn-primary{
  background:var(--accent);
  border:none;
  border-radius:.45rem;
  font-size:.8rem;
}

.btn-primary:hover{background:#147a8b}

.btn-outline-primary{
  color:var(--accent);
  border-color:var(--accent);
  border-radius:.45rem;
  font-size:.8rem;
}

.btn-outline-primary:hover{
  background:var(--accent);border-color:var(--accent);color:#fff;
}

.form-control, .form-select{
  border-radius:.4rem;
  border:1px solid #c1d1e9;
  font-size:.85rem;
}

.form-control:focus, .form-select:focus{
  border-color:var(--accent-light);
  box-shadow:0 0 0 .12rem rgba(139,202,230,.35);
}

.icon-bg{
  background:var(--accent);
  color:#fff;
  border-radius:.4rem 0 0 .4rem;
}

small{color:var(--muted);font-size:.75rem;}

/* LAYOUT */
footer {
    flex-shrink: 0;
}

.main-content {
    flex: 1 0 auto;
}

/* BOTÓN FLOTANTE CAPTURA (si se usa) */
#btnJpg{
  position:fixed;
  bottom:1rem;right:1rem;
  z-index:1040;
  font-size:.7rem;
}

/* RESPONSIVE */
@media (max-width:576px){
  .ui-header{padding:.6rem .8rem;}
  .card-body.p-3{padding:.5rem !important;}
}