:root {
  --bg: #f5f6f8; --card: #fff; --ink: #1d2330; --muted: #667085; --line: #e3e6ec;
  --brand: #2456d6; --brand-ink: #fff; --debt: #c0261e; --credit: #1a7f3c; --warn: #b26a00;
  --radius: 10px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--ink); }
a { color: var(--brand); }
h1 { font-size: 1.5rem; margin: .2rem 0 1rem; }
h2 { font-size: 1.15rem; margin: 1.4rem 0 .6rem; }
h3 { font-size: 1rem; margin: 1rem 0 .4rem; }
.container { max-width: 980px; margin: 0 auto; padding: 1rem; }
.topbar { display: flex; justify-content: space-between; align-items: center; padding: .6rem 1rem; background: #111827; color: #fff; }
.topbar .brand { color: #fff; font-weight: 700; text-decoration: none; }
.topbar-right { display: flex; gap: .8rem; align-items: center; }
.topbar form { margin: 0; display: inline-flex; gap: .2rem; }
.lang button { background: transparent; border: 1px solid #4b5563; color: #d1d5db; padding: .15rem .5rem; border-radius: 6px; cursor: pointer; }
.lang button.on { background: #fff; color: #111827; }
button.link { background: none; border: 0; color: #d1d5db; cursor: pointer; padding: 0; font: inherit; text-decoration: underline; }
.nav { display: flex; gap: .2rem; overflow-x: auto; background: #1f2937; padding: 0 .5rem; -webkit-overflow-scrolling: touch; }
.nav a { color: #cbd5e1; text-decoration: none; padding: .65rem .8rem; white-space: nowrap; }
.nav a.active { color: #fff; border-bottom: 3px solid #60a5fa; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem; margin-bottom: 1rem; }
.card.center { text-align: center; }
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.grid .card { margin: 0; }
.row { display: flex; gap: .6rem; flex-wrap: wrap; align-items: center; }
.row.between { justify-content: space-between; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.debt { color: var(--debt); font-weight: 700; }
.credit { color: var(--credit); font-weight: 700; }
.zero { font-weight: 700; }
.big { font-size: 1.8rem; font-weight: 800; line-height: 1.1; }
.flash { padding: .7rem 1rem; border-radius: var(--radius); margin-bottom: .8rem; border: 1px solid; word-break: break-word; }
.flash-success { background: #e8f6ed; border-color: #b5e2c4; color: #14532d; }
.flash-error { background: #fdeceb; border-color: #f5c2bf; color: #7a1712; }
.flash-warning { background: #fff4e0; border-color: #f5d7a1; color: #6b3f00; }
.flash-info { background: #e8f0fe; border-color: #bcd0f7; color: #1b3a8a; }
.btn, button.btn { display: inline-block; background: var(--brand); color: var(--brand-ink); border: 0; padding: .6rem 1rem; border-radius: 8px; font: inherit; font-weight: 600; text-decoration: none; cursor: pointer; }
.btn.secondary { background: #e9edf5; color: var(--ink); }
.btn.danger { background: var(--debt); }
.btn.small { padding: .3rem .6rem; font-size: .875rem; }
form.inline { display: inline; }
.field { display: block; margin-bottom: .8rem; }
.field > span { display: block; font-size: .875rem; color: var(--muted); margin-bottom: .2rem; }
input[type=text], input[type=email], input[type=password], input[type=date], input[type=number], input[type=tel], input[type=file], select, textarea {
  width: 100%; padding: .6rem .7rem; font: inherit; border: 1px solid #cfd5df; border-radius: 8px; background: #fff; color: var(--ink);
}
input:focus, select:focus, textarea:focus { outline: 2px solid #9db8f5; border-color: var(--brand); }
.field-error { display: block; color: var(--debt); margin-top: .2rem; }
.help { display: block; color: var(--muted); margin-top: .2rem; }
.checkbox { display: flex; gap: .5rem; align-items: center; margin-bottom: .8rem; }
.checkbox input { width: auto; }
.cols { display: grid; gap: 0 1rem; grid-template-columns: 1fr; }
@media (min-width: 640px) { .cols-2 { grid-template-columns: 1fr 1fr; } .cols-3 { grid-template-columns: 1fr 1fr 1fr; } }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: .5rem .4rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); }
td.num, th.num { text-align: right; white-space: nowrap; }
.table-wrap { overflow-x: auto; }
tr.group td { background: #f0f3f9; font-weight: 600; }
tr.total td { font-weight: 700; border-top: 2px solid var(--line); }
.badge { display: inline-block; padding: .1rem .5rem; border-radius: 999px; font-size: .78rem; font-weight: 600; white-space: nowrap; }
.badge-paid { background: #dff3e5; color: #14532d; }
.badge-partial { background: #fff0cf; color: #6b3f00; }
.badge-unpaid { background: #fde2e0; color: #7a1712; }
.badge-off { background: #e5e7eb; color: #374151; }
.balance-banner { padding: 1.2rem 1rem; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); margin-bottom: 1rem; }
.balance-banner.is-debt { border-left: 6px solid var(--debt); }
.balance-banner.is-credit { border-left: 6px solid var(--credit); }
.balance-banner.is-zero { border-left: 6px solid #9ca3af; }
.thumbs { display: flex; gap: .6rem; flex-wrap: wrap; }
.thumbs a { display: block; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: #fff; }
.thumbs img { display: block; width: 120px; height: 120px; object-fit: cover; }
.thumbs .pdf { width: 120px; height: 120px; display: flex; align-items: center; justify-content: center; font-weight: 700; color: var(--debt); }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: .3rem 1rem; }
.kv dt { color: var(--muted); } .kv dd { margin: 0; }
.login { max-width: 380px; margin: 2rem auto; }
.receipt { max-width: 520px; margin: 0 auto; }
pre.json { margin: 0; white-space: pre-wrap; word-break: break-all; font-size: .75rem; max-width: 360px; }
@media (max-width: 639px) { .hide-sm { display: none; } }
@media print {
  .topbar, .nav, .no-print, .flash { display: none !important; }
  body { background: #fff; }
  .card { border: 0; padding: 0; }
}