:root {
  --bg: #f4f6fa;
  --card: #ffffff;
  --text: #1b2330;
  --muted: #5d6878;
  --border: #dde2ea;
  --primary: #2563eb;
  --primary-text: #ffffff;
  --danger: #dc2626;
  --ok: #16a34a;
  --warn: #d97706;
  --track: #2563eb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141b;
    --card: #18202b;
    --text: #e6ebf2;
    --muted: #97a3b4;
    --border: #2a3442;
    --primary: #3b82f6;
    --danger: #ef4444;
    --ok: #22c55e;
    --warn: #f59e0b;
    --track: #60a5fa;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

header, main, footer {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 16px;
}

header { padding-top: 32px; }
h1 { margin: 0 0 4px; font-size: clamp(1.4rem, 5vw, 1.8rem); }
h2 { margin: 0 0 12px; font-size: 1.15rem; display: flex; align-items: center; gap: 8px; }
.subtitle, .hint { color: var(--muted); margin: 0 0 12px; }
.hint { font-size: 0.9rem; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin: 16px 0;
}

.buttons { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font: inherit;
  padding: 9px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
}
.btn:hover:not(:disabled) { border-color: var(--primary); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); }
.btn-danger { color: var(--danger); border-color: var(--danger); }
.btn-maps { background: var(--ok); border-color: var(--ok); color: #fff; }
.btn.disabled { opacity: 0.45; cursor: not-allowed; pointer-events: none; }

.check { display: flex; align-items: center; gap: 8px; font-size: 0.95rem; }

.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--border);
}
.badge.granted { background: var(--ok); color: #fff; }
.badge.denied { background: var(--danger); color: #fff; }
.badge.prompt { background: var(--warn); color: #fff; }

.mensaje { min-height: 1.5em; margin: 8px 0 0; font-weight: 500; }
.mensaje.error { color: var(--danger); }
.mensaje.ok { color: var(--ok); }

.live {
  font-size: 0.7rem;
  font-weight: 700;
  color: #fff;
  background: var(--danger);
  padding: 2px 8px;
  border-radius: 4px;
  animation: pulse 1.4s infinite;
}
@keyframes pulse { 50% { opacity: 0.4; } }

.coords { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.coord {
  display: flex;
  flex-direction: column;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
}
.label { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }
.value { font-size: clamp(1.3rem, 6vw, 1.7rem); font-weight: 700; font-variant-numeric: tabular-nums; word-break: break-all; }
.dms { color: var(--muted); font-variant-numeric: tabular-nums; }

.detalles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
  margin: 0;
}
.detalles div { padding: 10px 12px; border-radius: 8px; background: var(--bg); }
.detalles dt { font-size: 0.8rem; color: var(--muted); }
.detalles dd { margin: 0; font-weight: 600; font-variant-numeric: tabular-nums; }

canvas {
  width: 100%;
  aspect-ratio: 5 / 3;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  display: block;
}

.historial-header { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px; }
.historial-header h2 { margin: 0; }

.tabla-wrap { max-height: 320px; overflow: auto; border: 1px solid var(--border); border-radius: 8px; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; font-variant-numeric: tabular-nums; }
th, td { padding: 8px 10px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { position: sticky; top: 0; background: var(--card); }

footer { color: var(--muted); font-size: 0.85rem; text-align: center; padding-bottom: 32px; }

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  header { padding-top: 20px; }
  .card { padding: 16px; border-radius: 10px; margin: 12px 0; }
  .buttons { flex-direction: column; }
  .buttons .btn { width: 100%; padding: 12px 16px; }
  .historial-header { flex-direction: column; align-items: stretch; }
  canvas { aspect-ratio: 1 / 1; }
  th, td { padding: 6px 8px; font-size: 0.85rem; }
}

/* ---------- Página de compartir / panel ---------- */
.aviso ul { margin: 8px 0 14px; padding-left: 20px; color: var(--muted); }
.campo { display: flex; flex-direction: column; gap: 4px; margin: 12px 0; font-size: 0.9rem; }
.campo input { font: inherit; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--card); color: var(--text); }
.live-banner { background: var(--danger); color: #fff; padding: 10px 14px; border-radius: 8px; font-weight: 600; margin: 10px 0 0; }
.lista-sesiones { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.sesion { border: 1px solid var(--border); border-radius: 10px; padding: 14px; background: var(--bg); }
.sesion.offline { opacity: 0.55; }
.sesion-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 6px; }
.sesion-coords { font-size: 1.1rem; font-weight: 700; font-variant-numeric: tabular-nums; word-break: break-all; }
.sesion-meta { color: var(--muted); font-size: 0.85rem; margin: 4px 0 10px; }
.sesion .buttons { margin: 0; }
.sesion .btn { flex: 1; padding: 8px 10px; font-size: 0.9rem; }

.aviso-corto { color: var(--muted); margin: 0 0 4px; font-size: 0.95rem; }

.detalles .ancho { grid-column: 1 / -1; }
.detalles dd { word-break: break-word; }