/* Base sobria para la herramienta interna; sin framework por ahora. */
:root {
  --ink: #1f2933;
  --muted: #616e7c;
  --line: #d9e2ec;
  --surface: #ffffff;
  --ground: #f5f7fa;
  --accent: #0b5fa5;
  --ok-bg: #e3f6e8; --ok-ink: #1e4620;
  --bad-bg: #fdecea; --bad-ink: #611a15;
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--ink); background: var(--ground); }
a { color: var(--accent); }
.topbar { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 10px 20px; background: var(--surface); border-bottom: 1px solid var(--line); }
.topbar .brand { font-weight: 700; text-decoration: none; color: var(--ink); }
.topbar nav { display: flex; align-items: center; gap: 14px; }
.topbar .user { color: var(--muted); font-size: 13px; }
.container { max-width: 1080px; margin: 0 auto; padding: 24px 20px; }
.panel, .auth-card { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 20px 24px; }
.auth-card { max-width: 420px; margin: 60px auto; }
.muted { color: var(--muted); }
.field { margin-bottom: 14px; }
.field label { display: block; font-weight: 600; margin-bottom: 4px; }
.field input { width: 100%; padding: 9px 10px; border: 1px solid var(--line); border-radius: 6px; font: inherit; }
.button, button.link-button { font: inherit; cursor: pointer; }
.button { background: var(--accent); color: #fff; border: 0; border-radius: 6px; padding: 10px 16px; font-weight: 600; }
button.link-button { background: none; border: 0; color: var(--accent); padding: 0; text-decoration: underline; }
.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 16px; }
.flash-notice { background: var(--ok-bg); color: var(--ok-ink); }
.flash-alert { background: var(--bad-bg); color: var(--bad-ink); }

/* navegación */
.topbar { flex-wrap: wrap; }
.menu { display: flex; flex-wrap: wrap; gap: 4px 14px; }
.menu a { text-decoration: none; color: var(--muted); font-weight: 600; padding: 4px 0; border-bottom: 2px solid transparent; }
.menu a.active { color: var(--ink); border-bottom-color: var(--accent); }

/* tablas y tarjetas */
h1 { font-size: 24px; margin: 0 0 6px; }
h2 { font-size: 18px; margin: 0 0 10px; }
.page-head { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 18px; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.panel + .panel { margin-top: 18px; }
.grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid .wide { grid-column: 1 / -1; }
.grid .panel { min-width: 0; }
table { width: 100%; border-collapse: collapse; background: var(--surface); }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 12px; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
tr.total td { font-weight: 700; border-top: 2px solid var(--ink); }
.table-wrap { overflow-x: auto; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge-ok { background: var(--ok-bg); color: var(--ok-ink); }
.badge-bad { background: var(--bad-bg); color: var(--bad-ink); }
.badge-warn { background: #fff4d6; color: #6b4b00; }
.badge-draft { background: #e8edf3; color: #3b4a5a; }
.button-secondary { background: var(--surface); color: var(--accent); border: 1px solid var(--accent); }
.button-danger { background: var(--bad-ink); }
.button-small { padding: 5px 10px; font-size: 13px; }
.kpis { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); margin-bottom: 18px; }
.kpi { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; }
.kpi .label { color: var(--muted); font-size: 12px; text-transform: uppercase; }
.kpi .value { font-size: 22px; font-weight: 700; }
.inline-form { display: inline; }
.inline-form input[type=date] { padding: 4px 6px; border: 1px solid var(--line); border-radius: 6px; font: inherit; }

/* formularios */
.form-grid { display: grid; gap: 12px 18px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.form-grid .wide { grid-column: 1 / -1; }
.field select, .field textarea { width: 100%; padding: 9px 10px; border: 1px solid var(--line); border-radius: 6px; font: inherit; background: #fff; }
.field textarea { min-height: 80px; }
.field .hint { color: var(--muted); font-size: 12px; margin-top: 3px; }
.field.check label { display: inline; font-weight: 600; margin-left: 6px; }
.lines-table input { width: 100%; padding: 6px 8px; border: 1px solid var(--line); border-radius: 6px; font: inherit; }
.lines-table select { width: 100%; padding: 6px 8px; border: 1px solid var(--line); border-radius: 6px; font: inherit; background: #fff; }
.form-actions { margin-top: 18px; display: flex; gap: 10px; align-items: center; }

/* documento de factura (pantalla e impresión) */
.invoice-doc { background: #fff; max-width: 800px; margin: 0 auto; padding: 36px 44px; border: 1px solid var(--line); }
.invoice-doc .doc-head { display: flex; justify-content: space-between; gap: 24px; }
.invoice-doc .doc-title { font-size: 26px; font-weight: 700; margin: 0; }
.invoice-doc .block { margin-top: 22px; }
.invoice-doc .block h3 { font-size: 12px; text-transform: uppercase; color: var(--muted); margin: 0 0 4px; }
.invoice-doc table { margin-top: 18px; }
.invoice-doc .totals td { border: 0; padding: 4px 10px; }
.invoice-doc .footer { margin-top: 36px; font-size: 11px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 10px; }
.invoice-doc .fingerprint { font-family: ui-monospace, monospace; font-size: 10px; word-break: break-all; }
body.print { background: #fff; }
body.print .invoice-doc { border: 0; }
@media print { .no-print { display: none !important; } }