:root {
    --fondo: #0b0f16;
    --superficie: #141a24;
    --superficie-2: #1b2330;
    --borde: #253041;
    --texto: #e6ebf2;
    --tenue: #7a8494;
    --cian: #00c8ff;
    --rojo: #ff3a3a;
    --rosa: #ff4d6d;
    --verde: #28dc78;
    --naranja: #ff9620;
    --azul: #3c8cff;
    --radio: 14px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
    margin: 0;
    background: radial-gradient(1200px 600px at 10% -10%, #10233a 0%, transparent 60%), var(--fondo);
    color: var(--texto);
    font-family: "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main { flex: 1; width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 16px 24px; }

h1, h2 { margin: 0; font-weight: 600; }
code { background: var(--superficie-2); padding: 2px 6px; border-radius: 6px; color: var(--cian); word-break: break-all; }
.tenue { color: var(--tenue); }

/* ---------- Encabezado ---------- */
.encabezado {
    display: flex; flex-wrap: wrap; gap: 16px;
    align-items: center; justify-content: space-between;
    max-width: 1200px; width: 100%; margin: 0 auto; padding: 20px 16px;
}
.marca { display: flex; align-items: center; gap: 14px; }
.marca h1 { font-size: 1.5rem; letter-spacing: .5px; }
.subtitulo { margin: 2px 0 0; color: var(--tenue); font-size: .9rem; }
.controles { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }

.logo svg { width: 40px; height: 40px; fill: var(--rosa); filter: drop-shadow(0 0 10px rgba(255, 77, 109, .6)); display: block; }
.logo.grande svg { width: 72px; height: 72px; }

select, .boton, .rangos button {
    font: inherit; color: var(--texto);
    background: var(--superficie-2); border: 1px solid var(--borde);
    border-radius: 10px; padding: 8px 12px; cursor: pointer;
}
select:focus-visible, button:focus-visible { outline: 2px solid var(--cian); outline-offset: 2px; }

.boton { display: inline-block; text-decoration: none; background: var(--cian); color: #001018; border: none; font-weight: 600; }
.boton-secundario { background: var(--superficie-2); color: var(--texto); border: 1px solid var(--borde); font-weight: 400; }
.boton-claro { background: #fff; color: #7a0010; }
.boton-icono { background: none; border: none; color: var(--tenue); font-size: 1.1rem; cursor: pointer; padding: 4px 8px; border-radius: 8px; }
.boton-icono:hover { color: var(--texto); background: var(--superficie-2); }

.pastilla {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 12px; border-radius: 999px; font-size: .85rem;
    background: var(--superficie-2); border: 1px solid var(--borde); color: var(--tenue);
}
.pastilla::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: currentColor; }
.pastilla.en-linea { color: var(--verde); border-color: rgba(40, 220, 120, .4); }
.pastilla.en-linea::before { box-shadow: 0 0 8px var(--verde); animation: parpadeo 1.6s infinite; }
.pastilla.fuera { color: var(--rojo); border-color: rgba(255, 58, 58, .4); }
.pastilla-demo { color: var(--naranja); border-color: rgba(255, 150, 32, .4); }

/* ---------- Tarjetas ---------- */
.tarjeta {
    background: linear-gradient(180deg, var(--superficie) 0%, #111722 100%);
    border: 1px solid var(--borde);
    border-radius: var(--radio);
    padding: 18px;
    margin-bottom: 16px;
}
.tarjeta > header { color: var(--tenue); font-size: .9rem; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 10px; display: flex; align-items: center; justify-content: space-between; gap: 8px; }

.tarjetas { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; }
.tarjetas .tarjeta { margin-bottom: 0; }
.tarjetas + .tarjeta { margin-top: 16px; }

.indicador { --acento: var(--tenue); position: relative; overflow: hidden; }
.indicador::after {
    content: ""; position: absolute; inset: auto 0 0 0; height: 3px;
    background: var(--acento); box-shadow: 0 0 16px var(--acento);
    transition: background .4s;
}
.valor { display: flex; align-items: baseline; gap: 8px; }
.valor span { font-size: 3.6rem; font-weight: 700; line-height: 1; color: var(--acento); transition: color .4s; font-variant-numeric: tabular-nums; }
.valor small { color: var(--tenue); font-size: 1rem; }
.valor-texto { font-size: 2rem; font-weight: 700; color: var(--acento); min-height: 3.6rem; display: flex; align-items: center; }
.zona { margin-top: 8px; font-weight: 600; color: var(--acento); }
.zona.tenue { color: var(--tenue); font-weight: 400; }
.sin-senal .valor span, .sin-senal .zona { opacity: .45; }

.corazon svg { width: 26px; height: 26px; fill: var(--rosa); display: block; }
.latiendo { animation: latido 1s infinite; transform-origin: center; }
.corazon:not(.latiendo) svg { fill: var(--tenue); }

.resumen { display: grid; grid-template-columns: 1fr auto; gap: 6px 12px; margin: 0; }
.resumen dt { color: var(--tenue); }
.resumen dd { margin: 0; font-weight: 600; text-align: right; font-variant-numeric: tabular-nums; }

/* ---------- Paciente / alertas ---------- */
.fila-paciente { display: flex; align-items: center; gap: 8px; margin: 4px 0 16px; }
.fila-paciente h2 { font-size: 1.3rem; }

.banner-alerta {
    display: flex; flex-wrap: wrap; align-items: center; gap: 12px;
    background: linear-gradient(90deg, #b3001b, #ff3a3a);
    border-radius: var(--radio); padding: 14px 18px; margin-bottom: 16px;
    box-shadow: 0 0 30px rgba(255, 58, 58, .35);
    animation: pulso-alerta 1.5s infinite;
}
.banner-alerta strong { flex: 1 1 180px; }
.banner-icono { font-size: 1.4rem; }

/* ---------- Gráfica ---------- */
.encabezado-grafica { flex-wrap: wrap; }
.rangos { display: flex; flex-wrap: wrap; gap: 6px; text-transform: none; letter-spacing: 0; }
.rangos button { padding: 5px 10px; font-size: .85rem; }
.rangos button.activo { background: var(--cian); color: #001018; border-color: var(--cian); font-weight: 600; }
.lienzo-grafica { position: relative; height: 320px; }

/* ---------- Tabla ---------- */
.tabla-envoltura { overflow-x: auto; }
.tabla-alertas { width: 100%; border-collapse: collapse; }
.tabla-alertas th { text-align: left; color: var(--tenue); font-weight: 400; font-size: .85rem; padding: 8px; border-bottom: 1px solid var(--borde); }
.tabla-alertas td { padding: 10px 8px; border-bottom: 1px solid var(--borde); white-space: nowrap; }
.tabla-alertas tr.pendiente td:nth-child(2) { color: var(--rojo); font-weight: 600; }
.tabla-alertas .atendida { color: var(--tenue); }
.tabla-alertas button { font: inherit; font-size: .85rem; padding: 4px 10px; border-radius: 8px; border: 1px solid var(--borde); background: var(--superficie-2); color: var(--texto); cursor: pointer; }

/* ---------- Estados vacíos / instalación ---------- */
.vacio { text-align: center; padding: 48px 18px; }
.vacio h2 { margin: 16px 0 8px; }
.datos-esp32 { display: inline-grid; grid-template-columns: auto 1fr; gap: 8px 14px; text-align: left; margin-top: 12px; max-width: 100%; }
.datos-esp32 dt { color: var(--tenue); }
.datos-esp32 dd { margin: 0; min-width: 0; }
.aviso-instalar { max-width: 640px; margin: 40px auto; }

.instalacion { max-width: 640px; margin: 48px auto; padding: 0 16px; }
.instalacion pre { background: var(--superficie); border: 1px solid var(--borde); padding: 12px; border-radius: 10px; color: var(--cian); overflow-x: auto; }
.aviso { padding: 12px 16px; border-radius: 10px; }
.aviso-ok { background: rgba(40, 220, 120, .12); border: 1px solid rgba(40, 220, 120, .4); }
.aviso-error { background: rgba(255, 58, 58, .12); border: 1px solid rgba(255, 58, 58, .4); }

.pie { text-align: center; color: var(--tenue); font-size: .8rem; padding: 16px; border-top: 1px solid var(--borde); }
.pie span { display: block; margin-top: 4px; }

/* ---------- Animaciones ---------- */
@keyframes latido {
    0%   { transform: scale(1); }
    15%  { transform: scale(1.25); }
    30%  { transform: scale(1); }
    45%  { transform: scale(1.12); }
    60%, 100% { transform: scale(1); }
}
@keyframes parpadeo { 50% { opacity: .35; } }
@keyframes pulso-alerta { 50% { box-shadow: 0 0 6px rgba(255, 58, 58, .2); } }

@media (prefers-reduced-motion: reduce) {
    .latiendo, .banner-alerta, .pastilla.en-linea::before { animation: none; }
}

@media (max-width: 600px) {
    .marca h1 { font-size: 1.2rem; }
    .valor span { font-size: 2.8rem; }
    .lienzo-grafica { height: 240px; }
    .banner-alerta .boton { width: 100%; }
}