:root {
  --azul: #1a4f8a;
  --azul-claro: #2c6fbd;
  --verde: #27ae60;
  --rojo: #c0392b;
  --naranja: #e67e22;
  --gris: #f4f6f9;
  --borde: #dce3ec;
  --texto: #222;
  --texto-suave: #666;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  font-size: 15px;
  background: var(--gris);
  color: var(--texto);
  min-height: 100vh;
}

/* ─── NAV ─── */
nav {
  background: var(--azul);
  padding: 0 1rem;
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
}
nav .brand {
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
  padding: 1rem 1rem 1rem 0;
  margin-right: 1rem;
  white-space: nowrap;
}
nav a {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  padding: 1rem 0.85rem;
  font-size: 0.9rem;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}
nav a:hover, nav a.activo { background: rgba(255,255,255,0.15); color: #fff; }

/* ─── CONTENEDOR ─── */
.contenedor {
  max-width: 980px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

h1 { font-size: 1.4rem; margin-bottom: 1.2rem; color: var(--azul); }
h2 { font-size: 1.1rem; margin-bottom: 0.8rem; color: var(--azul); }

/* ─── CARDS ─── */
.card {
  background: #fff;
  border-radius: 8px;
  border: 1px solid var(--borde);
  padding: 1.2rem;
  margin-bottom: 1rem;
}

/* ─── GRID ─── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1rem; }
@media (max-width: 600px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* ─── FORMS ─── */
.form-row { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 0.8rem; }
.form-row label { display: flex; flex-direction: column; gap: 0.25rem; flex: 1; min-width: 140px; font-size: 0.85rem; color: var(--texto-suave); }
input, select, textarea {
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--borde);
  border-radius: 6px;
  font-size: 0.95rem;
  width: 100%;
  font-family: inherit;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--azul-claro);
  box-shadow: 0 0 0 2px rgba(44,111,189,0.15);
}

/* ─── BOTONES ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.55rem 1.1rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  font-family: inherit;
  font-weight: 600;
  transition: opacity 0.15s, transform 0.1s;
}
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-azul   { background: var(--azul); color: #fff; }
.btn-verde  { background: var(--verde); color: #fff; }
.btn-rojo   { background: var(--rojo); color: #fff; }
.btn-gris   { background: #e0e4ea; color: var(--texto); }
.btn-naranja { background: var(--naranja); color: #fff; }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }
.btn-xs { padding: 0.2rem 0.5rem; font-size: 0.75rem; }
.btn:hover { opacity: 0.88; }

/* ─── TABLAS ─── */
.tabla-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { padding: 0.55rem 0.75rem; text-align: left; border-bottom: 1px solid var(--borde); }
th { background: var(--gris); font-weight: 600; color: var(--texto-suave); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.03em; }
tr:hover td { background: #f8fafc; }

/* ─── BADGES ─── */
.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge-verde  { background: #d4edda; color: #155724; }
.badge-rojo   { background: #f8d7da; color: #721c24; }
.badge-naranja { background: #fff3cd; color: #856404; }
.badge-azul   { background: #d1ecf1; color: #0c5460; }
.badge-gris   { background: #e2e3e5; color: #383d41; }

/* ─── ALERTAS ─── */
.alerta {
  padding: 0.75rem 1rem;
  border-radius: 6px;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}
.alerta-ok     { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.alerta-error  { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.alerta-info   { background: #d1ecf1; color: #0c5460; border: 1px solid #bee5eb; }
.alerta-aviso  { background: #fff3cd; color: #856404; border: 1px solid #ffeeba; }

/* ─── TOTALES ─── */
.total-row td { font-weight: 700; border-top: 2px solid var(--azul); background: #eef4ff; }

/* ─── TABS ─── */
.tabs { display: flex; gap: 0; border-bottom: 2px solid var(--borde); margin-bottom: 1rem; }
.tab-btn {
  padding: 0.6rem 1.1rem;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--texto-suave);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  font-family: inherit;
}
.tab-btn.activo { color: var(--azul); border-bottom-color: var(--azul); font-weight: 600; }
.tab-panel { display: none; }
.tab-panel.activo { display: block; }

/* ─── SEMÁFORO PRESENTISMO ─── */
.pres-ok  { color: var(--verde); font-weight: 600; }
.pres-no  { color: var(--rojo); font-weight: 600; }

/* ─── UPLOAD AREA ─── */
.upload-area {
  border: 2px dashed var(--borde);
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  color: var(--texto-suave);
  cursor: pointer;
  transition: border-color 0.2s;
}
.upload-area:hover, .upload-area.drag { border-color: var(--azul-claro); color: var(--azul); }
.upload-area input { display: none; }

/* ─── SPINNER ─── */
.spinner {
  display: inline-block;
  width: 1.1em; height: 1.1em;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── STAT CARDS ─── */
.stats { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px,1fr)); gap: 0.8rem; margin-bottom: 1.2rem; }
.stat-card {
  background: #fff;
  border: 1px solid var(--borde);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
}
.stat-card .valor { font-size: 1.6rem; font-weight: 700; color: var(--azul); }
.stat-card .label { font-size: 0.78rem; color: var(--texto-suave); margin-top: 0.2rem; }

/* ─── MOBILE ─── */
@media (max-width: 480px) {
  nav a { padding: 0.75rem 0.6rem; font-size: 0.82rem; }
  h1 { font-size: 1.2rem; }
  .card { padding: 0.9rem; }
}