/* Tema oscuro, mobile-first, botones grandes. */

:root {
  --fondo: #0d1117;
  --panel: #161b22;
  --borde: #2d333b;
  --texto: #e6edf3;
  --texto-suave: #8b949e;
  --alpha: #58c4dc;    /* calma */
  --beta: #f0a83c;     /* foco */
  --transicion: #b083f0;
  --peligro: #e5534b;
  --acento: #3fb68b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--fondo);
  color: var(--texto);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  min-height: 100dvh;
  padding: env(safe-area-inset-top) env(safe-area-inset-right)
           env(safe-area-inset-bottom) env(safe-area-inset-left);
}

.cabecera { padding: 1.2rem 1.2rem 0.4rem; }
.cabecera h1 { margin: 0; font-size: 1.6rem; letter-spacing: 0.02em; }
.aviso { margin: 0.3rem 0 0; color: var(--texto-suave); font-size: 0.85rem; }

.vista { padding: 1rem 1.2rem 2rem; max-width: 480px; margin: 0 auto; }

/* ── Tarjetas de presets ── */
.tarjetas { display: grid; gap: 0.8rem; }
.cargando { color: var(--texto-suave); }

.tarjeta {
  width: 100%;
  text-align: left;
  background: var(--panel);
  border: 1px solid var(--borde);
  border-radius: 14px;
  padding: 1rem 1.1rem;
  color: var(--texto);
  font: inherit;
  cursor: pointer;
  transition: border-color 0.15s;
}
.tarjeta:active { border-color: var(--acento); }
.tarjeta h3 { margin: 0 0 0.25rem; font-size: 1.15rem; text-transform: capitalize; }
.tarjeta p { margin: 0 0 0.6rem; color: var(--texto-suave); font-size: 0.9rem; }
.tarjeta .datos { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.chip {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-size: 0.78rem;
  background: var(--borde);
  color: var(--texto);
}
.chip.alpha { background: color-mix(in srgb, var(--alpha) 25%, transparent); color: var(--alpha); }
.chip.beta { background: color-mix(in srgb, var(--beta) 25%, transparent); color: var(--beta); }
.chip.transicion {
  background: color-mix(in srgb, var(--transicion) 25%, transparent);
  color: var(--transicion);
}

/* ── Sesión ── */
.btn-volver {
  background: none; border: none; color: var(--acento);
  font-size: 1rem; padding: 0.3rem 0; cursor: pointer;
}
#sesion-nombre { margin: 0.4rem 0 0.2rem; font-size: 1.4rem; text-transform: capitalize; }
.desc { margin: 0 0 1rem; color: var(--texto-suave); font-size: 0.92rem; }

.timer {
  font-size: clamp(4rem, 22vw, 6.5rem);
  font-variant-numeric: tabular-nums;
  font-weight: 200;
  text-align: center;
  margin: 1.2rem 0 0.4rem;
  letter-spacing: 0.03em;
}

.indicador {
  display: flex; align-items: center; justify-content: center; gap: 0.7rem;
  min-height: 2rem; margin-bottom: 1.6rem;
}
.beat-hz { color: var(--texto-suave); font-variant-numeric: tabular-nums; }

.controles { display: grid; gap: 0.8rem; }
.btn-grande {
  width: 100%;
  padding: 1.1rem;
  border-radius: 16px;
  border: none;
  font-size: 1.25rem;
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
}
.btn-play { background: var(--acento); color: #04160f; }
.btn-stop { background: var(--peligro); color: #fff; }
.btn-pausa { background: var(--panel); color: var(--texto); border: 1px solid var(--borde); }
.btn-grande:disabled { opacity: 0.5; }

.volumen { display: block; margin-top: 1.6rem; color: var(--texto-suave); font-size: 0.9rem; }
.volumen input {
  width: 100%; margin-top: 0.5rem; accent-color: var(--acento); height: 2rem;
}

.mensaje {
  margin-top: 1rem; padding: 0.8rem 1rem; border-radius: 12px;
  background: color-mix(in srgb, var(--peligro) 15%, transparent);
  color: var(--peligro); font-size: 0.92rem;
}

/* ── Navegación inferior ── */
.nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  display: flex;
  background: color-mix(in srgb, var(--fondo) 88%, transparent);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--borde);
  padding-bottom: env(safe-area-inset-bottom);
}
.nav-btn {
  flex: 1; padding: 0.9rem; background: none; border: none;
  color: var(--texto-suave); font-size: 1rem; cursor: pointer;
}
.nav-btn.activo { color: var(--acento); font-weight: 600; }
.vista { padding-bottom: 5rem; }

/* ── Ajustes AirPods ── */
.bloque {
  background: var(--panel); border: 1px solid var(--borde);
  border-radius: 14px; padding: 1rem 1.1rem; margin-top: 1rem;
}
.bloque h3 { margin: 0 0 0.4rem; font-size: 1.05rem; }
.controles-test { display: grid; gap: 0.6rem; margin: 0.8rem 0; }
.btn-test {
  padding: 0.9rem; border-radius: 12px; border: 1px solid var(--borde);
  background: var(--fondo); color: var(--texto); font-size: 1.05rem; cursor: pointer;
}
.btn-test:disabled { opacity: 0.5; }
.btn-test.sonando { border-color: var(--acento); color: var(--acento); }
.confirmacion {
  display: flex; gap: 0.6rem; align-items: flex-start;
  font-size: 0.92rem; color: var(--texto-suave);
}
.confirmacion input { width: 1.2rem; height: 1.2rem; accent-color: var(--acento); }
.checklist { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.7rem; }
.checklist li { display: flex; gap: 0.6rem; align-items: flex-start; }
.checklist input { width: 1.2rem; height: 1.2rem; flex-shrink: 0; accent-color: var(--acento); }
.checklist .texto { font-size: 0.95rem; }
.checklist .ruta { display: block; color: var(--texto-suave); font-size: 0.8rem; margin-top: 0.15rem; }