:root {
  --paper: #FBFAF7; --ink: #14171C; --line: #C9C5BB; --line-soft: #E4E1D8;
  --sello: #B3261E; --asiento: #176B47; --aviso: #9A6B00; --tinta-suave: #5C6066;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 15px/1.5 "IBM Plex Sans", sans-serif; }
h1, h2, summary { font-family: "Space Grotesk", sans-serif; }
.masthead { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; padding: 28px 32px 18px; border-bottom: 3px double var(--ink); }
.masthead h1 { margin: 0; font-size: 30px; letter-spacing: -0.5px; }
.masthead .sub { margin: 2px 0 0; color: var(--tinta-suave); font-size: 13px; }
.ejercicio-box { border: 1.5px solid var(--ink); padding: 6px 10px; background: #fff; text-align: center; }
.ejercicio-box label { display: block; font-size: 10px; text-transform: uppercase; letter-spacing: 1px; }
.ejercicio-box input { border: 0; font: 600 22px "IBM Plex Mono", monospace; width: 86px; text-align: center; background: transparent; }
.apartados { display: flex; flex-wrap: wrap; gap: 0; border-bottom: 1px solid var(--line); padding: 0 32px; background: #fff; position: sticky; top: 0; z-index: 5; }
.apartados a { padding: 10px 14px; text-decoration: none; color: var(--tinta-suave); font-size: 13px; border-bottom: 3px solid transparent; }
.apartados a.active, .apartados a:hover { color: var(--ink); border-bottom-color: var(--sello); }
main { max-width: 1100px; margin: 0 auto; padding: 8px 32px 60px; }
section { padding: 26px 0; border-bottom: 1px solid var(--line-soft); }
h2 { font-size: 19px; margin: 0 0 14px; display: flex; align-items: center; gap: 10px; }
.cas { display: inline-flex; align-items: center; justify-content: center; min-width: 26px; height: 26px; border: 1.5px solid var(--ink); font: 600 13px "IBM Plex Mono", monospace; background: #fff; }
.count { font: 600 12px "IBM Plex Mono", monospace; color: var(--tinta-suave); }
.hint { color: var(--tinta-suave); font-size: 13px; margin: 0 0 14px; max-width: 70ch; }
small { display: block; color: var(--tinta-suave); font-weight: 400; }
label { font-weight: 600; font-size: 13px; }
input, select { font: 14px "IBM Plex Sans", sans-serif; padding: 8px 10px; border: 1px solid var(--line); background: #fff; width: 100%; margin-top: 4px; }
input:focus, select:focus, button:focus { outline: 2px solid var(--ink); outline-offset: 1px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 14px; }
.btn { font: 600 13px "IBM Plex Sans", sans-serif; padding: 9px 16px; border: 1.5px solid var(--ink); background: #fff; cursor: pointer; }
.btn:hover { background: var(--ink); color: #fff; }
.btn.primary { background: var(--ink); color: #fff; }
.btn.primary:hover { background: var(--sello); border-color: var(--sello); }
.inline-form { display: flex; flex-wrap: wrap; gap: 8px; align-items: flex-end; margin-top: 12px; }
.inline-form input, .inline-form select { width: auto; min-width: 130px; margin-top: 0; }
.inline-form .wide { flex: 1; min-width: 240px; }
.tbl { width: 100%; border-collapse: collapse; background: #fff; font-size: 13px; }
.tbl th { text-align: left; font: 600 11px "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: 0.5px; border-bottom: 2px solid var(--ink); padding: 8px 6px; background: #fff; }
.tbl td { border-bottom: 1px solid var(--line-soft); padding: 6px; vertical-align: middle; }
.tbl td.num { font-family: "IBM Plex Mono", monospace; text-align: right; white-space: nowrap; }
.tbl select, .tbl input { padding: 4px 6px; font-size: 12px; margin: 0; }
.tbl-wrap { max-height: 520px; overflow: auto; border: 1px solid var(--line); }
.tbl-wrap thead th { position: sticky; top: 0; }
.gain { color: var(--asiento); } .loss { color: var(--sello); }
.warn { color: var(--aviso); font: 600 11px "IBM Plex Mono", monospace; }
.del { color: var(--sello); background: none; border: none; cursor: pointer; font-size: 15px; }
.net-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }
.net-card { border: 1.5px solid var(--ink); background: #fff; padding: 14px; display: flex; flex-direction: column; gap: 8px; }
.net-card h3 { margin: 0; font: 700 16px "Space Grotesk", sans-serif; display: flex; justify-content: space-between; align-items: center; }
.net-card .meta { font: 12px "IBM Plex Mono", monospace; color: var(--tinta-suave); }
.toggle { display: flex; border: 1.5px solid var(--ink); width: max-content; }
.toggle button { font: 700 12px "IBM Plex Mono", monospace; padding: 6px 16px; border: 0; background: #fff; cursor: pointer; }
.toggle button.on { background: var(--asiento); color: #fff; }
.toggle button.off { background: var(--sello); color: #fff; }
.toggle .q { align-self: center; font-size: 11px; color: var(--tinta-suave); margin-right: 8px; }
.add-net { margin-top: 16px; }
.add-net summary { cursor: pointer; font-size: 14px; }
.synclog { background: var(--ink); color: #DDE3DC; font: 12px/1.6 "IBM Plex Mono", monospace; padding: 14px; max-height: 320px; overflow: auto; margin-top: 14px; white-space: pre-wrap; }
.filters { display: flex; gap: 10px; align-items: center; margin-bottom: 10px; flex-wrap: wrap; }
.filters input, .filters select { width: auto; margin: 0; }
.chk { display: flex; align-items: center; gap: 6px; font-weight: 400; }
.chk input { width: auto; margin: 0; }
.casillas { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; margin: 6px 0 16px; }
.casilla { border: 1.5px solid var(--ink); background: #fff; padding: 12px 14px; }
.casilla .code { font: 600 11px "IBM Plex Mono", monospace; color: var(--tinta-suave); }
.casilla .label { font-size: 12px; min-height: 32px; }
.casilla .value { font: 600 22px "IBM Plex Mono", monospace; margin-top: 4px; }
.deficit { border: 1.5px solid var(--sello); background: #FDF3F2; padding: 12px 14px; margin-bottom: 14px; }
.deficit h4 { margin: 0 0 6px; color: var(--sello); font: 700 13px "IBM Plex Mono", monospace; text-transform: uppercase; }
.stamp-ok { border: 1.5px solid var(--asiento); color: var(--asiento); background: #F1F8F4; padding: 10px 14px; font: 600 13px "IBM Plex Mono", monospace; margin-bottom: 14px; }
footer { text-align: center; color: var(--tinta-suave); font-size: 12px; padding: 18px 32px 40px; border-top: 3px double var(--ink); margin-top: 30px; }
a.tx { color: var(--ink); }
@media (max-width: 720px) { .grid2 { grid-template-columns: 1fr; } main, .masthead, .apartados { padding-left: 14px; padding-right: 14px; } }
@media (prefers-reduced-motion: no-preference) { section { scroll-margin-top: 60px; } html { scroll-behavior: smooth; } }
.h3 { font: 700 14px "Space Grotesk", sans-serif; margin: 20px 0 8px; }
.btnrow { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; align-items: center; }
.file-btn { display: inline-block; }
.tbl.slim td, .tbl.slim th { padding: 5px 8px; font-size: 12.5px; }
.bulkbar { display: flex; gap: 10px; align-items: center; background: #FFF7E6; border: 1.5px solid var(--aviso); padding: 8px 12px; margin-bottom: 8px; font-size: 13px; }
.bulkbar select { width: auto; margin: 0; }
textarea { width: 100%; font: 12px "IBM Plex Mono", monospace; border: 1px solid var(--line); padding: 8px; margin: 8px 0; }
code { font-family: "IBM Plex Mono", monospace; background: #EFEDE6; padding: 1px 4px; }
a.btn { text-decoration: none; color: inherit; display: inline-block; }