:root {
  --bg: #f4f6f8; --card: #fff; --txt: #1d2329; --muted: #6b7680; --borde: #e2e6ea;
  --pri: #128c7e; --pri-txt: #fff; --ok: #1a9c55; --warn: #d99100; --err: #d13b3b;
  --in: #fff; --out: #d9fdd3; --out-bot: #e7f0ff; --chat-bg: #efeae2;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111b21; --card: #1b262d; --txt: #e6eaed; --muted: #8b989f; --borde: #2a3942;
    --pri: #21a88f; --in: #202c33; --out: #005c4b; --out-bot: #1f3a5c; --chat-bg: #0b141a;
  }
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--txt); }
a { color: var(--pri); text-decoration: none; }
h1 { font-size: 1.5rem; margin: 0; }
h2 { font-size: 1.1rem; margin: 0 0 .8rem; }
h3 { font-size: 1rem; margin: 1.2rem 0 .5rem; }
code { background: var(--bg); padding: .1em .35em; border-radius: 4px; font-size: .9em; word-break: break-all; }
.muted { color: var(--muted); } .small { font-size: .85rem; } .xsmall { font-size: .75rem; }

.top { display: flex; align-items: center; gap: 1.5rem; padding: .7rem 1.2rem; background: var(--card); border-bottom: 1px solid var(--borde); }
.top .marca { font-weight: 700; color: var(--txt); }
.top nav { display: flex; gap: .3rem; flex: 1; }
.top nav a { padding: .35rem .8rem; border-radius: 6px; color: var(--muted); }
.top nav a.on, .top nav a:hover { background: var(--bg); color: var(--txt); }
.top .user { font-size: .85rem; color: var(--muted); }

.wrap { max-width: 1100px; margin: 0 auto; padding: 1.5rem 1rem 3rem; }
.head-row { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-bottom: 1.2rem; }
.card { background: var(--card); border: 1px solid var(--borde); border-radius: 10px; padding: 1.2rem; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem; }
.cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 1rem; align-items: start; }
.vacio { text-align: center; color: var(--muted); }

.flash { padding: .7rem 1rem; border-radius: 8px; margin-bottom: 1rem; background: #e3f6ec; color: #145c36; }
.flash.err { background: #fde8e8; color: #8a1f1f; }
.aviso { margin-top: .8rem; padding: .5rem .7rem; border-radius: 6px; background: var(--bg); font-size: .85rem; }
.aviso.err { background: #fde8e8; color: #8a1f1f; }

label { display: block; margin-bottom: .9rem; font-size: .9rem; font-weight: 500; }
label small { display: block; font-weight: 400; color: var(--muted); margin-top: .2rem; }
label.check { display: flex; gap: .5rem; align-items: center; font-weight: 400; }
input, select, textarea { width: 100%; margin-top: .3rem; padding: .55rem .7rem; border: 1px solid var(--borde); border-radius: 7px; font: inherit; background: var(--card); color: var(--txt); }
input[type=checkbox] { width: auto; margin: 0; }
input:disabled { opacity: .6; }

.btn { display: inline-block; padding: .5rem 1rem; border-radius: 7px; border: 1px solid var(--borde); background: var(--card); color: var(--txt); font: inherit; cursor: pointer; white-space: nowrap; }
.btn:hover { filter: brightness(.97); }
.btn.primary { background: var(--pri); border-color: var(--pri); color: var(--pri-txt); }
.btn.ghost { background: transparent; }
.btn.danger { background: var(--err); border-color: var(--err); color: #fff; }
.btn.sm { padding: .25rem .6rem; font-size: .85rem; }
.btn:disabled { opacity: .5; }
.link { background: none; border: 0; color: var(--pri); cursor: pointer; padding: 0; font: inherit; font-size: .85rem; }
.acciones { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.acciones form { margin: 0; }
form.inline { display: inline; }

.badge { display: inline-block; padding: .15rem .6rem; border-radius: 99px; font-size: .78rem; font-weight: 600; }
.badge.ok { background: #dcf5e7; color: var(--ok); } .badge.warn { background: #fff1d6; color: var(--warn); } .badge.off { background: var(--bg); color: var(--muted); }

.sitio-top { display: flex; justify-content: space-between; align-items: start; gap: .5rem; }
.sitio-top h2 { margin: 0; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: .5rem; margin-top: 1rem; text-align: center; }
.stats b { display: block; font-size: 1.3rem; } .stats span { font-size: .75rem; color: var(--muted); }

.qr { text-align: center; margin: 1rem 0; } .qr img { width: 260px; max-width: 100%; background: #fff; padding: 8px; border-radius: 8px; }
.secreto { display: flex; gap: .5rem; align-items: center; margin-bottom: .4rem; }
.probar { display: flex; gap: .5rem; } .probar input { margin: 0; }
pre { background: var(--bg); padding: .8rem; border-radius: 7px; white-space: pre-wrap; font-size: .85rem; }
.peligro { border-color: #f1c4c4; }

.login { max-width: 380px; margin: 10vh auto; padding: 0 1rem; text-align: center; }
.login .card { text-align: left; margin-top: 1rem; }
.login .btn { width: 100%; }

/* --- Conversaciones --- */
main.full { padding: 0; }
.chat-app { display: grid; grid-template-columns: 340px 1fr; height: calc(100vh - 53px); }
.chat-lista { border-right: 1px solid var(--borde); background: var(--card); display: flex; flex-direction: column; min-height: 0; }
.filtros { padding: .7rem; display: grid; gap: .4rem; border-bottom: 1px solid var(--borde); }
.filtros select, .filtros input { margin: 0; }
#lista { list-style: none; margin: 0; padding: 0; overflow-y: auto; flex: 1; }
#lista li { padding: .65rem .9rem; border-bottom: 1px solid var(--borde); cursor: pointer; }
#lista li:hover, #lista li.on { background: var(--bg); }
.fila { display: flex; justify-content: space-between; align-items: center; gap: .4rem; }
.prev { flex: 1; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.pill { background: var(--pri); color: #fff; border-radius: 99px; font-size: .72rem; padding: 0 .45rem; min-width: 1.3rem; text-align: center; }
.pill.gris { background: var(--muted); }

.chat-panel { display: flex; flex-direction: column; min-height: 0; background: var(--chat-bg); }
.chat-vacio { margin: auto; color: var(--muted); }
.chat-head { display: flex; align-items: center; gap: .8rem; padding: .6rem 1rem; background: var(--card); border-bottom: 1px solid var(--borde); }
.chat-head > div { flex: 1; }
.chat-head .volver { display: none; }
.switch { display: flex; align-items: center; gap: .4rem; margin: 0; cursor: pointer; }
.mensajes { flex: 1; overflow-y: auto; padding: 1rem 6%; }
.msg { display: flex; flex-direction: column; margin-bottom: .45rem; max-width: 75%; }
.msg.in { align-items: flex-start; }
.msg.out { align-items: flex-end; margin-left: auto; }
.burbuja { padding: .45rem .7rem; border-radius: 8px; background: var(--in); box-shadow: 0 1px 1px rgba(0,0,0,.08); word-wrap: break-word; }
.msg.out .burbuja { background: var(--out); }
.msg.out.bot .burbuja { background: var(--out-bot); }
.meta { font-size: .7rem; color: var(--muted); margin-top: .1rem; }
.tipo { font-size: .72rem; background: rgba(0,0,0,.08); padding: 0 .3rem; border-radius: 4px; }
.chat-form { display: flex; gap: .5rem; padding: .6rem 1rem; background: var(--card); border-top: 1px solid var(--borde); }
.chat-form textarea { margin: 0; resize: none; max-height: 120px; }

@media (max-width: 760px) {
  .top { flex-wrap: wrap; gap: .5rem 1rem; } .top .user { width: 100%; }
  .chat-app { grid-template-columns: 1fr; height: calc(100vh - 90px); }
  .chat-panel { display: none; }
  body.chat-abierto .chat-lista { display: none; }
  body.chat-abierto .chat-panel { display: flex; }
  .chat-head .volver { display: inline-block; }
  .msg { max-width: 90%; }
}