* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { min-height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: #f1f5f9; color: #1f2937;
  display: flex; flex-direction: column; align-items: center;
  padding: calc(16px + env(safe-area-inset-top, 0px)) 16px calc(16px + env(safe-area-inset-bottom, 0px));
}
[hidden] { display: none !important; }
.card { background: #fff; border-radius: 16px; padding: 24px; width: 100%; max-width: 440px; box-shadow: 0 4px 24px rgba(0,0,0,.08); }
.marca { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.marca img { width: 44px; height: 44px; border-radius: 12px; }
.marca h1 { font-size: 20px; }
.marca p { font-size: 13px; color: #6b7280; }
.intro { font-size: 14px; color: #4b5563; line-height: 1.45; }
label { display: block; font-size: 12px; font-weight: 600; color: #4b5563; margin: 16px 0 6px; text-transform: uppercase; letter-spacing: .3px; }
input { width: 100%; padding: 14px 16px; border: 2px solid #e5e7eb; border-radius: 12px; font-size: 17px; font-family: inherit; }
input:focus { outline: none; border-color: #1D4ED8; }
#chapa { text-transform: uppercase; letter-spacing: 1px; }
button { display: block; width: 100%; padding: 16px; margin-top: 16px; border: none; border-radius: 12px; font-size: 17px; font-weight: 700; color: #fff; background: #1D4ED8; cursor: pointer; }
form button { margin-top: 24px; }
button:disabled { opacity: .6; }
button.secundario { background: #fff; color: #1f2937; border: 2px solid #e5e7eb; }
button.enlace { background: none; color: #6b7280; font-weight: 500; font-size: 14px; padding: 8px; }
.error { color: #b91c1c; font-size: 14px; margin-top: 14px; min-height: 1em; }
.estado { text-align: center; padding: 8px 0 4px; }
.pulso { width: 88px; height: 88px; border-radius: 50%; margin: 0 auto 16px; display: flex; align-items: center; justify-content: center;
  font-size: 40px; background: #10b981; animation: pulso 2s infinite; }
.pulso.alerta { background: #f59e0b; animation: none; }
.pulso.mal { background: #ef4444; animation: none; }
.pulso.pausa { background: #9ca3af; animation: none; }
@keyframes pulso { 0% { box-shadow: 0 0 0 0 rgba(16,185,129,.55); } 70% { box-shadow: 0 0 0 22px rgba(16,185,129,0); } 100% { box-shadow: 0 0 0 0 rgba(16,185,129,0); } }
.estado h2 { font-size: 20px; margin-bottom: 4px; }
.estado .sub { color: #6b7280; font-size: 14px; }
.datos { margin-top: 20px; border-top: 1px solid #f0f0f0; }
.fila { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px; }
.fila span:first-child { color: #6b7280; }
.fila span:last-child { font-weight: 600; text-align: right; }
.aviso { margin-top: 18px; background: #fffbeb; border: 1px solid #fde68a; color: #92400e; border-radius: 12px; padding: 12px 14px; font-size: 13.5px; line-height: 1.45; }