:root {
  --bg: #f4f6fa;
  --card: #ffffff;
  --text: #18202f;
  --muted: #667085;
  --line: #e3e7ef;
  --brand: #4361ee;        /* azul del logo Marck Business */
  --brand-hover: #3651d4;
  --brand-soft: #e9edfd;
  --on-brand: #ffffff;
  --ok: #12805c;
  --ok-soft: #e3f5ee;
  --warn: #a8530a;
  --warn-soft: #fdf0e1;
  --danger: #c4320a;
  --danger-soft: #fdecea;
  /* Tipos de mensaje */
  --t-amigable: #0b8a61;
  --t-alerta: #b45f06;
  --t-critico: #c92a2a;
  --t-confirmacion: var(--brand);
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141c;
    --card: #171e29;
    --text: #e7ebf2;
    --muted: #98a2b3;
    --line: #283243;
    --brand: #7b93ff;
    --brand-hover: #98abff;
    --brand-soft: #1d2648;
    --on-brand: #0b1220;
    --ok: #3ccf91;
    --ok-soft: #123326;
    --warn: #f5a54a;
    --warn-soft: #3a2810;
    --danger: #ff7a66;
    --danger-soft: #3d1a14;
    --t-amigable: #38d9a9;
    --t-alerta: #ffa94d;
    --t-critico: #ff8787;
    --shadow: none;
  }
}

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

body {
  margin: 0;
  font: 15px/1.45 "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
}

h1, h2 { margin: 0 0 12px; line-height: 1.2; }
h1 { font-size: 22px; }
h2 { font-size: 17px; }
.sub { margin: 0; color: var(--muted); font-size: 13px; }

/* Marca */
.marca { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 16px; }
.logo-img { height: 36px; width: auto; display: block; }
.logo-login { display: block; height: 96px; width: auto; margin: 0 auto 14px; }

/* Tarjetas y formularios */
.tarjeta {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}
.tarjeta-cab { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; margin-bottom: 12px; }
.tarjeta-cab h2 { margin-bottom: 2px; }

label { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin-bottom: 12px; }
input:not([type=checkbox]), textarea {
  display: block; width: 100%; margin-top: 6px;
  padding: 10px 12px;
  font: inherit; color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px;
}
textarea { resize: vertical; min-height: 110px; }
input:focus, textarea:focus { outline: 2px solid var(--brand); outline-offset: -1px; border-color: transparent; }
input[type=checkbox] { width: 17px; height: 17px; accent-color: var(--brand); margin: 0; flex-shrink: 0; }

.btn {
  font: inherit; font-size: 14px; font-weight: 600;
  padding: 8px 14px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--card); color: var(--text);
  cursor: pointer; white-space: nowrap;
}
.btn:hover { border-color: var(--muted); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.primario { background: var(--brand); border-color: var(--brand); color: var(--on-brand); }
.btn.primario:hover:not(:disabled) { background: var(--brand-hover); border-color: var(--brand-hover); }
.btn.chico { padding: 4px 9px; font-size: 12px; }
.btn.peligro { color: var(--danger); }
.btn.peligro:hover { background: var(--danger-soft); border-color: var(--danger); }

.error { color: var(--danger); font-size: 13px; min-height: 18px; margin: 0 0 8px; }

/* Login */
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-caja { width: 100%; max-width: 360px; padding: 28px; }
.login-caja h1 { text-align: center; margin-bottom: 4px; }
.login-sub { text-align: center; margin-bottom: 20px; }
.login-caja .btn { width: 100%; padding: 11px; }

/* Barra superior */
.barra {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 12px 20px; background: var(--card); border-bottom: 1px solid var(--line);
}
.barra-der { display: flex; align-items: center; gap: 14px; }
.estado { font-size: 13px; color: var(--muted); display: inline-flex; align-items: center; gap: 6px; }
.estado::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
.estado.vivo { color: var(--ok); }
.estado.vivo::before { background: var(--ok); }
.estado.caido { color: var(--danger); }
.estado.caido::before { background: var(--danger); }

/* Distribución */
.grid {
  display: grid; grid-template-columns: minmax(300px, 400px) 1fr; gap: 20px;
  max-width: 1200px; margin: 0 auto; padding: 20px; align-items: start;
}
.columna { display: grid; gap: 20px; min-width: 0; }
@media (max-width: 820px) {
  .grid { grid-template-columns: 1fr; padding: 16px; }
  .barra { padding: 12px 16px; }
}

/* Lista de clientes */
.lista { list-style: none; margin: 0; padding: 0; }
.sel-todos { display: flex; align-items: center; gap: 10px; padding: 8px 10px; margin: 0; border-bottom: 1px solid var(--line); color: var(--text); font-weight: 600; }
#lista-clientes { max-height: calc(100vh - 230px); overflow-y: auto; }
.vacio { color: var(--muted); font-size: 14px; padding: 18px 10px; text-align: center; }

.cliente {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding: 10px; border-bottom: 1px solid var(--line);
}
.cliente:hover { background: var(--bg); }
.cliente-sel { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 160px; margin: 0; cursor: pointer; color: var(--text); font-weight: 400; }
.punto { width: 9px; height: 9px; border-radius: 50%; background: var(--line); flex-shrink: 0; }
.punto.on { background: var(--ok); box-shadow: 0 0 0 3px var(--ok-soft); }
.cliente-info { display: grid; min-width: 0; }
.cliente-nombre { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cliente-sub { font-size: 12px; color: var(--muted); }
.insignia { font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 99px; background: var(--warn-soft); color: var(--warn); }
.cliente-acciones { display: flex; gap: 6px; }

/* Nuevo mensaje */
.destino { margin: -4px 0 14px; font-size: 14px; color: var(--muted); }
.destino strong { color: var(--text); }

/* Selector de tipo */
.t-amigable { --c: var(--t-amigable); }
.t-alerta { --c: var(--t-alerta); }
.t-critico { --c: var(--t-critico); }
.t-confirmacion { --c: var(--t-confirmacion); }
.tipos { border: 0; padding: 0; margin: 0 0 6px; display: flex; flex-wrap: wrap; gap: 8px; }
.tipos legend { padding: 0; margin-bottom: 8px; font-size: 13px; font-weight: 600; color: var(--muted); }
.tipo {
  position: relative; display: inline-flex; align-items: center; gap: 8px; margin: 0;
  padding: 7px 14px; border: 1px solid var(--line); border-radius: 99px;
  font-size: 14px; color: var(--text); cursor: pointer; user-select: none;
}
.tipo input { position: absolute; opacity: 0; pointer-events: none; }
.tipo::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--c); }
.tipo:hover { border-color: var(--c); }
.tipo:has(input:checked) {
  border-color: var(--c); color: var(--c); font-weight: 700;
  background: color-mix(in srgb, var(--c) 12%, transparent);
}
.tipo:has(input:focus-visible) { outline: 2px solid var(--c); outline-offset: 2px; }
.tipo-ayuda { margin: 0 0 14px; font-size: 13px; color: var(--muted); min-height: 18px; }
.botones-confirmacion { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 480px) { .botones-confirmacion { grid-template-columns: 1fr; gap: 0; } }
.acciones { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.acciones .btn { padding: 10px 22px; }
.aviso { margin: 0; font-size: 13px; }
.aviso.ok { color: var(--ok); }
.aviso.error { color: var(--danger); }

/* Historial */
.historial { max-height: 520px; overflow-y: auto; }
.mensaje { border-bottom: 1px solid var(--line); padding: 12px 4px; }
.mensaje:last-child { border-bottom: 0; }
.mensaje-cab {
  display: flex; justify-content: space-between; gap: 12px; width: 100%;
  background: none; border: 0; padding: 0; font: inherit; color: var(--text);
  text-align: left; cursor: pointer;
}
.mensaje-cab strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fecha { font-size: 12px; color: var(--muted); white-space: nowrap; }
.mensaje-texto {
  margin: 4px 0 8px; font-size: 14px; color: var(--muted); white-space: pre-wrap;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.mensaje.abierto .mensaje-texto { -webkit-line-clamp: unset; display: block; }
.stats { display: flex; gap: 6px; flex-wrap: wrap; }
.chip { font-size: 12px; font-weight: 600; padding: 2px 9px; border-radius: 99px; background: var(--bg); color: var(--muted); border: 1px solid var(--line); }
.chip.ok { background: var(--ok-soft); color: var(--ok); border-color: transparent; }
.chip.no { background: var(--danger-soft); color: var(--danger); border-color: transparent; }
.chip.tipo-chip { color: var(--c); border-color: transparent; background: color-mix(in srgb, var(--c) 12%, transparent); }
.detalle { list-style: none; margin: 10px 0 0; padding: 8px 10px; background: var(--bg); border-radius: 8px; font-size: 13px; }
.detalle li { display: flex; justify-content: space-between; gap: 10px; padding: 4px 0; }
.detalle .ok { color: var(--ok); }
.detalle .medio { color: var(--brand); }
.detalle .pend { color: var(--warn); }
.detalle .no { color: var(--danger); }

/* Notificaciones de respuestas */
.notificaciones {
  position: fixed; right: 16px; bottom: 16px; z-index: 50;
  display: grid; gap: 10px; width: min(360px, calc(100vw - 32px));
}
.notificacion {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 12px 12px 12px 14px;
  background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--c);
  border-radius: 10px; box-shadow: 0 8px 24px rgba(8, 12, 20, .18);
  animation: entrar .25s ease-out;
}
.notificacion.si { --c: var(--ok); }
.notificacion.no { --c: var(--danger); }
.notificacion-icono {
  flex-shrink: 0; display: grid; place-items: center;
  width: 26px; height: 26px; border-radius: 50%;
  font-weight: 800; font-size: 14px; color: var(--c);
  background: color-mix(in srgb, var(--c) 15%, transparent);
}
.notificacion-texto { flex: 1; min-width: 0; }
.notificacion-texto p { margin: 0; font-size: 14px; }
.notificacion-sub { display: block; font-size: 12px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.notificacion-cerrar {
  flex-shrink: 0; border: 0; background: none; color: var(--muted);
  font-size: 20px; line-height: 1; padding: 0 4px; cursor: pointer;
}
.notificacion-cerrar:hover { color: var(--text); }
@keyframes entrar { from { opacity: 0; transform: translateY(8px); } }

/* Diálogo */
dialog {
  width: min(440px, calc(100vw - 32px));
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); color: var(--text); padding: 22px;
}
dialog::backdrop { background: rgba(8, 12, 20, .5); }
.acciones-dlg { display: flex; justify-content: flex-end; gap: 10px; margin-top: 8px; }
.codigo {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin: 10px 0 16px; padding: 14px 16px;
  background: var(--brand-soft); border-radius: 10px;
}
#codigo-valor { font: 700 22px/1 Consolas, "Cascadia Mono", monospace; letter-spacing: 2px; color: var(--brand); }
.pasos { margin: 0 0 12px; padding-left: 20px; font-size: 14px; color: var(--muted); }
.pasos li { margin-bottom: 6px; }
.nota-servidor { margin-bottom: 14px; }
code { font-family: Consolas, monospace; background: var(--bg); padding: 1px 6px; border-radius: 5px; color: var(--text); }