:root {
  --brand: #0d9488;
  --brand-dark: #0f766e;
  --brand-soft: #ccfbf1;
  --ink: #18181b;
  --muted: #71717a;
  --faint: #a1a1aa;
  --line: #e4e4e7;
  --bg: #f4f4f5;
  --card: #ffffff;
  --soft: #f4f4f5;
  --ok-bg: #f0fdf4; --ok-line: #bbf7d0; --ok-ink: #166534;
  --err-bg: #fef2f2; --err-line: #fecaca; --err-ink: #b91c1c;
  --warn-ink: #b45309;
  --radius: 14px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--brand-dark); }
h1, h2, h3 { margin: 0; line-height: 1.25; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1rem; }
code, .mono { font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }

/* Encabezado */
.top { background: var(--card); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; gap: 12px; min-height: 60px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 1.15rem; color: var(--ink); text-decoration: none; letter-spacing: -.01em; }
.brand b { color: var(--brand); }
.brand svg { color: var(--brand); }
.nav { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; align-items: center; }
.nav a, .nav button {
  font: inherit; font-size: .875rem; color: var(--muted); text-decoration: none; background: none;
  border: 0; padding: 6px 10px; border-radius: 8px; cursor: pointer;
}
.nav a:hover, .nav button:hover { background: var(--soft); color: var(--ink); }
.nav a.on { color: var(--ink); font-weight: 600; background: var(--soft); }
.nav form { margin: 0; }
.tag { font-size: .7rem; font-weight: 700; background: var(--ink); color: #fff; padding: 2px 7px; border-radius: 6px; }

main { padding: 28px 0 60px; }
.lead { color: var(--muted); margin: 4px 0 0; font-size: .9rem; }

/* Tarjetas y formularios */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.stack > * + * { margin-top: 20px; }
.grid-qr { display: grid; gap: 20px; grid-template-columns: 1fr; margin-top: 20px; }
@media (min-width: 900px) { .grid-qr { grid-template-columns: 1fr 300px; } }
label.lbl { display: block; font-size: .875rem; font-weight: 600; margin-bottom: 4px; }
.hint { font-size: .78rem; color: var(--faint); margin: 4px 0 0; }
.hint.warn { color: var(--warn-ink); }
input[type=text], input[type=email], input[type=password], input[type=url], input[type=date], input[type=number], textarea {
  width: 100%; font: inherit; font-size: .9rem; color: var(--ink); background: #fff;
  border: 1px solid #d4d4d8; border-radius: 10px; padding: 9px 12px; outline: none;
}
input:focus, textarea:focus { border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.row > .grow { flex: 1 1 180px; min-width: 0; }
.fields { display: grid; gap: 14px; grid-template-columns: 1fr; }
@media (min-width: 600px) { .fields.two { grid-template-columns: 1fr 1fr; } }
.box { background: var(--soft); border-radius: 12px; padding: 16px; margin-top: 18px; }
.box-title { display: flex; align-items: center; gap: 6px; font-weight: 600; font-size: .9rem; }

.prefix { display: flex; align-items: stretch; border: 1px solid #d4d4d8; border-radius: 10px; background: #fff; overflow: hidden; }
.prefix span { padding: 9px 4px 9px 12px; color: var(--faint); font-size: .9rem; white-space: nowrap; }
.prefix input { border: 0; border-radius: 0; padding-left: 0; min-width: 90px; }
.prefix input:focus { box-shadow: none; }
.prefix:focus-within { border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font: inherit; font-size: .875rem; font-weight: 600; text-decoration: none; cursor: pointer;
  border: 0; border-radius: 10px; padding: 9px 14px; background: var(--soft); color: var(--ink);
}
.btn:hover { background: #e4e4e7; }
.btn:disabled { opacity: .45; cursor: default; }
.btn.primary { background: var(--brand); color: #fff; }
.btn.primary:hover { background: var(--brand-dark); }
.btn.dark { background: var(--ink); color: #fff; }
.btn.dark:hover { background: #27272a; }
.btn.sm { font-size: .78rem; padding: 5px 9px; border-radius: 8px; }
.btn.ghost { background: none; color: var(--muted); }
.btn.ghost:hover { background: var(--err-bg); color: var(--err-ink); }
.btn.block { width: 100%; }
.seg { display: flex; gap: 4px; flex-wrap: wrap; }
.seg .btn.on { background: var(--ink); color: #fff; }
input[type=color] { width: 48px; height: 38px; padding: 2px; border: 1px solid #d4d4d8; border-radius: 8px; background: #fff; cursor: pointer; }
input[type=color]:disabled { opacity: .4; }
.check { display: inline-flex; align-items: center; gap: 6px; font-size: .8rem; color: var(--muted); cursor: pointer; }

/* Avisos */
.flash { border: 1px solid; border-radius: 12px; padding: 10px 14px; font-size: .9rem; margin-bottom: 16px; }
.flash.ok { background: var(--ok-bg); border-color: var(--ok-line); color: var(--ok-ink); }
.flash.error { background: var(--err-bg); border-color: var(--err-line); color: var(--err-ink); }
.shortbox { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 12px; padding: 10px 12px;
  background: var(--ok-bg); border: 1px solid var(--ok-line); border-radius: 10px; font-size: .9rem; }
.shortbox .mono { color: var(--ok-ink); font-weight: 600; word-break: break-all; }

/* Vista previa del QR */
.preview { display: flex; flex-direction: column; align-items: center; }
.qr-frame { border-radius: 12px; padding: 12px; background: #fff; }
.qr-frame.transp { background: repeating-conic-gradient(#e4e4e7 0% 25%, #fff 0% 50%) 50% / 16px 16px; }
#qr-preview { width: 216px; height: 216px; display: flex; align-items: center; justify-content: center; }
#qr-preview canvas, #qr-preview svg { display: block; width: 216px !important; height: 216px !important; }
.qr-empty { color: #d4d4d8; }
.qr-value { font-size: .72rem; color: var(--faint); text-align: center; word-break: break-all; margin: 10px 0 0; }
.preview .btn { margin-top: 8px; }

/* Lista de links */
.links { margin-top: 10px; }
.link { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 12px 0; border-top: 1px solid #f4f4f5; }
.link:first-child { border-top: 0; }
.link .info { flex: 1 1 260px; min-width: 0; }
.link .short { font-weight: 600; word-break: break-all; }
.link .dest { font-size: .78rem; color: var(--faint); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pills { display: flex; flex-wrap: wrap; gap: 6px; font-size: .75rem; }
.pill { background: var(--soft); color: #52525b; border-radius: 999px; padding: 2px 9px; white-space: nowrap; }
.pill.brand { background: var(--brand-soft); color: var(--brand-dark); font-weight: 600; }
.pill.red { background: var(--err-bg); color: var(--err-ink); }
.pill.green { background: var(--ok-bg); color: var(--ok-ink); }
.editor { flex-basis: 100%; background: var(--soft); border-radius: 10px; padding: 12px; }
.empty { text-align: center; border: 1px dashed #d4d4d8; background: var(--card); border-radius: var(--radius); padding: 28px 20px; }
.empty p { max-width: 560px; margin: 6px auto 0; font-size: .85rem; color: var(--muted); }

/* Login */
.auth { min-height: 100vh; display: grid; place-items: center; padding: 24px 16px; }
.auth .card { width: 100%; max-width: 400px; padding: 28px; }
.auth .brand { justify-content: center; font-size: 1.5rem; margin-bottom: 6px; }
.auth .lead { text-align: center; margin-bottom: 22px; }
.auth .foot { text-align: center; font-size: .82rem; color: var(--muted); margin-top: 18px; }

/* Admin */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .875rem; }
th { text-align: left; font-size: .75rem; color: var(--muted); font-weight: 600; padding: 8px 10px; border-bottom: 1px solid var(--line); white-space: nowrap; }
td { padding: 10px; border-bottom: 1px solid #f4f4f5; vertical-align: top; }
td .sub { font-size: .78rem; color: var(--faint); }
details.user > summary { list-style: none; cursor: pointer; }
details.user > summary::-webkit-details-marker { display: none; }
.user-card { border: 1px solid var(--line); border-radius: 12px; padding: 14px; margin-top: 10px; background: var(--card); }
.user-card summary { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; }
.user-card .who { flex: 1 1 220px; min-width: 0; }
.user-card .who strong { display: block; }
.user-card .who span { font-size: .8rem; color: var(--muted); word-break: break-all; }
.user-card .body { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }
.cred { background: #0f172a; color: #e2e8f0; border-radius: 12px; padding: 16px; margin-bottom: 16px; }
.cred pre { white-space: pre-wrap; margin: 8px 0 12px; font-size: .85rem; }
.cred .btn { background: #fff; color: #0f172a; }