:root {
  --bg: #f6f7f9; --card: #fff; --text: #1b1f24; --muted: #6a737d; --border: #e3e6ea;
  --accent: #0f62fe; --danger: #c62828; --ok: #2e7d32; --warn: #b26a00;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111418; --card: #1a1e24; --text: #e6e8eb; --muted: #9aa4af; --border: #2b3139;
    --accent: #6ea0ff; --danger: #ff6b6b; --ok: #6fcf75; --warn: #ffb347; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
main { max-width: 1200px; margin: 0 auto; padding: 24px 16px 64px; }
header { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 20px; }
h1 { font-size: 22px; margin: 0; }
form { margin: 0; }
.muted { color: var(--muted); font-size: 13px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; }
.tabs { display: flex; gap: 4px; margin-bottom: 12px; flex-wrap: wrap; }
.tabs a { padding: 6px 12px; border-radius: 999px; text-decoration: none; color: var(--muted); border: 1px solid transparent; }
.tabs a.active { color: var(--text); border-color: var(--border); background: var(--card); font-weight: 600; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); font-weight: 600; }
tr:last-child td { border-bottom: none; }
td.num { text-align: right; font-variant-numeric: tabular-nums; }
.late { color: var(--danger); font-weight: 600; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; border: 1px solid var(--border); }
.badge.paid { color: var(--ok); border-color: currentColor; }
button, .btn { font: inherit; padding: 6px 12px; border-radius: 6px; border: 1px solid var(--border);
  background: var(--card); color: var(--text); cursor: pointer; text-decoration: none; display: inline-block; }
button.primary, .btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.actions { display: flex; gap: 6px; }
.flash { margin: 0 0 12px; padding: 8px 12px; border-radius: 8px; border: 1px solid var(--border); }
.flash.error { color: var(--danger); border-color: currentColor; }
.flash.success { color: var(--ok); border-color: currentColor; }
.empty { padding: 40px 16px; text-align: center; color: var(--muted); }
.login { max-width: 360px; margin: 15vh auto; padding: 24px; }
.login input { width: 100%; padding: 8px 10px; margin: 8px 0 12px; border-radius: 6px; border: 1px solid var(--border); background: var(--bg); color: var(--text); font: inherit; }
.total { font-weight: 600; }
.toolbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.toolbar .tabs { margin-bottom: 0; }
.search { display: flex; gap: 6px; }
.search input { padding: 6px 10px; border-radius: 6px; border: 1px solid var(--border); background: var(--card); color: var(--text); font: inherit; min-width: 220px; }
button.ghost { border-color: transparent; color: var(--muted); }
button.ghost:hover { color: var(--text); border-color: var(--border); }