:root {
  --bg: #f4f6f9; --panel: #fff; --text: #1d2433; --muted: #5d6778; --line: #e2e6ec;
  --brand: #0b5cad; --brand-2: #094a8b; --brand-soft: #e7f0fa;
  --ok: #1b7f4b; --ok-soft: #e5f5ec; --warn: #a15c00; --warn-soft: #fff4e0;
  --bad: #b3261e; --bad-soft: #fdecea; --info: #3d5a80; --info-soft: #eaf0f7;
  --radius: 10px; --shadow: 0 1px 3px rgba(16,24,40,.08);
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; color: var(--text); background: var(--bg); }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 1.45rem; margin: 0 0 1rem; }
h2 { font-size: 1.1rem; margin: 1.4rem 0 .6rem; }
h3 { font-size: 1rem; margin: 1rem 0 .5rem; }
small, .muted { color: var(--muted); }
code { background: #eef1f5; padding: 1px 5px; border-radius: 4px; font-size: .9em; }

/* Layout */
.app { display: grid; grid-template-columns: 240px 1fr; min-height: 100vh; }
.side { background: #0f2540; color: #cdd6e3; padding: 16px 10px; position: sticky; top: 0; height: 100vh; overflow-y: auto; }
.side .logo { color: #fff; font-weight: 700; font-size: 1.05rem; padding: 4px 10px 14px; display: block; }
.side .logo span { display: block; font-weight: 400; font-size: .75rem; color: #9fb0c6; }
.side nav a { display: flex; align-items: center; justify-content: space-between; color: #cdd6e3; padding: 8px 10px; border-radius: 7px; margin: 1px 0; }
.side nav a:hover { background: #1b3a5e; text-decoration: none; color: #fff; }
.side nav a.act { background: var(--brand); color: #fff; }
.side .grupo { font-size: .7rem; text-transform: uppercase; letter-spacing: .06em; color: #7f93ad; margin: 14px 10px 4px; }
.badge { display: inline-block; min-width: 20px; padding: 1px 7px; border-radius: 999px; font-size: .75rem; font-weight: 600; text-align: center; }
.badge.bad { background: var(--bad); color: #fff; } .badge.warn { background: #f3a33b; color: #231500; }
.main { padding: 22px 28px 60px; min-width: 0; }
.top { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 16px; }
.top .user { color: var(--muted); font-size: .9rem; display: flex; gap: 10px; align-items: center; }
.menu-btn { display: none; }

/* Components */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); margin-bottom: 18px; }
.card > h2:first-child, .card > h3:first-child { margin-top: 0; }
.grid { display: grid; gap: 14px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); } .g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.kpi { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.kpi .l { color: var(--muted); font-size: .8rem; } .kpi .v { font-size: 1.35rem; font-weight: 700; margin-top: 2px; font-variant-numeric: tabular-nums; } .kpi .s { font-size: .8rem; color: var(--muted); }
.bar { height: 8px; background: #e9edf2; border-radius: 99px; overflow: hidden; margin-top: 8px; }
.bar > i { display: block; height: 100%; background: var(--brand); }
.bar.warn > i { background: #f3a33b; } .bar.bad > i { background: var(--bad); }

.btn { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--brand); background: var(--brand); color: #fff; padding: 8px 14px; border-radius: 8px; font: inherit; font-weight: 600; cursor: pointer; text-decoration: none !important; }
.btn:hover { background: var(--brand-2); }
.btn.sec { background: #fff; color: var(--brand); } .btn.sec:hover { background: var(--brand-soft); }
.btn.danger { background: var(--bad); border-color: var(--bad); } .btn.sm { padding: 4px 10px; font-size: .85rem; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.acciones { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.msg { padding: 10px 14px; border-radius: 8px; margin-bottom: 12px; border: 1px solid; }
.msg.ok { background: var(--ok-soft); border-color: #b6e0c7; color: #0f5132; }
.msg.error, .msg.critico { background: var(--bad-soft); border-color: #f1b8b3; color: #7a1a14; }
.msg.advertencia { background: var(--warn-soft); border-color: #f5d49b; color: #6b3d00; }
.msg.info { background: var(--info-soft); border-color: #c8d6e8; color: #243b5a; }
.alerta { display: flex; gap: 12px; padding: 12px 14px; border-radius: 8px; border-left: 5px solid; margin-bottom: 10px; background: #fff; }
.alerta.critico { border-color: var(--bad); background: var(--bad-soft); } .alerta.advertencia { border-color: #f3a33b; background: var(--warn-soft); } .alerta.info { border-color: var(--info); background: var(--info-soft); }
.alerta b { display: block; } .alerta p { margin: 2px 0 0; font-size: .9rem; }

table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { padding: 8px 8px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { font-size: .75rem; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); background: #f8f9fb; }
td.n, th.n { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
tr.anulado td { color: #9aa3af; text-decoration: line-through; }
tfoot td { font-weight: 700; background: #f8f9fb; }
.tabla { overflow-x: auto; }
.pill { display: inline-block; padding: 1px 8px; border-radius: 99px; font-size: .75rem; font-weight: 600; }
.pill.ok { background: var(--ok-soft); color: var(--ok); } .pill.bad { background: var(--bad-soft); color: var(--bad); }
.pill.warn { background: var(--warn-soft); color: var(--warn); } .pill.info { background: var(--info-soft); color: var(--info); } .pill.gris { background: #eef0f3; color: #5d6778; }

form .campo { margin-bottom: 12px; }
label { display: block; font-weight: 600; font-size: .85rem; margin-bottom: 4px; }
label.chk { display: flex; gap: 8px; align-items: flex-start; font-weight: 400; font-size: .92rem; }
input[type=text], input[type=email], input[type=password], input[type=number], input[type=date], input[type=month], input[type=url], select, textarea {
  width: 100%; padding: 8px 10px; border: 1px solid #cdd3dc; border-radius: 7px; font: inherit; background: #fff; }
input:focus, select:focus, textarea:focus { outline: 2px solid #9cc3ec; border-color: var(--brand); }
.ayuda { font-size: .8rem; color: var(--muted); margin-top: 3px; }
.filtros { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; }
.filtros .campo { margin: 0; min-width: 140px; }
details.card summary { cursor: pointer; font-weight: 600; }

/* Emisión */
.lineas td { padding: 4px; } .lineas input, .lineas select { padding: 6px 8px; }
.totales { max-width: 420px; margin-left: auto; }
.totales div { display: flex; justify-content: space-between; padding: 4px 0; border-bottom: 1px dashed var(--line); font-variant-numeric: tabular-nums; }
.totales .grande { font-size: 1.15rem; font-weight: 700; border-bottom: 2px solid var(--text); }
.letras { font-size: .85rem; color: var(--muted); text-align: right; margin-top: 6px; }

.login { max-width: 400px; margin: 8vh auto; }
.manual { max-width: 900px; } .manual h1 { font-size: 1.6rem; } .manual table { margin: 10px 0; } .manual img { max-width: 100%; }

@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .side { position: fixed; z-index: 20; width: 260px; left: -270px; transition: left .2s; }
  .side.abierto { left: 0; }
  .menu-btn { display: inline-flex; }
  .main { padding: 16px; }
  .g2, .g3, .g4 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) { .g2, .g3, .g4 { grid-template-columns: 1fr; } }

/* Diseño de factura */
.diseno-grid { display: grid; grid-template-columns: minmax(320px, 420px) 1fr; gap: 18px; align-items: start; }
.previa { position: sticky; top: 12px; }
.previa iframe { width: 100%; height: 80vh; border: 1px solid var(--line); border-radius: 8px; background: #e9ecef; margin-top: 10px; }
@media (max-width: 1100px) { .diseno-grid { grid-template-columns: 1fr; } .previa { position: static; } }