/* Billing App - one stylesheet, no outside fonts or libraries (works offline and on any hosting). */
:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --ink: #1d2433;
  --muted: #5f6b7a;
  --line: #dfe3e8;
  --brand: #1f5fbf;
  --brand-ink: #ffffff;
  --brand-soft: #e8f0fc;
  --good: #1a7f4b;
  --good-soft: #e3f4ea;
  --warn: #9a6200;
  --warn-soft: #fdf1dc;
  --bad: #b42318;
  --bad-soft: #fde8e6;
  --radius: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b; --panel: #1b2029; --ink: #e6e9ee; --muted: #9aa4b2; --line: #2c3340;
    --brand: #5b9bf0; --brand-ink: #0d1117; --brand-soft: #1d2a40;
    --good: #4cc38a; --good-soft: #15291f; --warn: #e7b04a; --warn-soft: #2e2512; --bad: #f2766a; --bad-soft: #321a18;
    --shadow: none;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 22px; margin: 0 0 4px; }
h2 { font-size: 17px; margin: 0 0 12px; }
h3 { font-size: 15px; margin: 0 0 8px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.nowrap { white-space: nowrap; }
.right { text-align: right; }

/* Layout */
.topbar { background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.topbar-inner { max-width: 1200px; margin: 0 auto; padding: 8px 16px 0; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; }
.brand { font-weight: 700; color: var(--ink); white-space: nowrap; }
.brand span { color: var(--brand); }
.nav { display: flex; gap: 4px; overflow-x: auto; order: 3; flex: 1 1 100%; padding-bottom: 6px; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a { color: var(--muted); padding: 8px 10px; border-radius: 6px; white-space: nowrap; font-size: 14px; }
.nav a:hover { background: var(--bg); text-decoration: none; color: var(--ink); }
.nav a.on { background: var(--brand-soft); color: var(--brand); font-weight: 600; }
.who { display: flex; align-items: center; gap: 8px; white-space: nowrap; font-size: 13px; margin-left: auto; }
.who form { margin: 0; }
main { max-width: 1200px; margin: 0 auto; padding: 20px 16px 48px; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }

/* Panels */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); margin-bottom: 16px; }
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid-stats { grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; display: block; color: var(--ink); box-shadow: var(--shadow); }
a.stat:hover { border-color: var(--brand); text-decoration: none; }
.stat .label { color: var(--muted); font-size: 13px; }
.stat .value { font-size: 26px; font-weight: 700; margin-top: 2px; font-variant-numeric: tabular-nums; }
.stat.good .value { color: var(--good); }
.stat.warn .value { color: var(--warn); }
.stat.bad .value { color: var(--bad); }
dl.kv { display: grid; grid-template-columns: 140px 1fr; gap: 6px 12px; margin: 0; }
dl.kv dt { color: var(--muted); }
dl.kv dd { margin: 0; overflow-wrap: anywhere; }

/* Tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 9px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--bg); color: var(--muted); font-weight: 600; font-size: 13px; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
tfoot td { font-weight: 700; background: var(--bg); }

/* Badges */
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; font-weight: 600; white-space: nowrap; background: var(--bg); color: var(--muted); border: 1px solid var(--line); }
.badge.good { background: var(--good-soft); color: var(--good); border-color: transparent; }
.badge.warn { background: var(--warn-soft); color: var(--warn); border-color: transparent; }
.badge.bad { background: var(--bad-soft); color: var(--bad); border-color: transparent; }
.badge.info { background: var(--brand-soft); color: var(--brand); border-color: transparent; }

/* Messages */
.flash { padding: 12px 14px; border-radius: var(--radius); margin-bottom: 12px; border: 1px solid transparent; }
.flash.success { background: var(--good-soft); color: var(--good); }
.flash.warning, .flash.info { background: var(--warn-soft); color: var(--warn); }
.flash.info { background: var(--brand-soft); color: var(--brand); }
.flash.error { background: var(--bad-soft); color: var(--bad); }

/* Forms */
form.stack > * + * { margin-top: 12px; }
label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 4px; }
.hint { font-size: 12px; color: var(--muted); margin-top: 3px; }
input[type=text], input[type=password], input[type=number], input[type=date], input[type=search], select, textarea {
  width: 100%; padding: 9px 10px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); color: var(--ink); font: inherit;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--brand); outline-offset: -1px; border-color: var(--brand); }
input[readonly] { background: var(--bg); }
.row { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.filters { display: flex; gap: 8px; flex-wrap: wrap; align-items: flex-end; }
.filters > div { min-width: 140px; }
.filters .grow { flex: 1; min-width: 200px; }
.check { display: flex; gap: 8px; align-items: flex-start; font-weight: 400; font-size: 14px; }
.check input { margin-top: 3px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 9px 14px; border-radius: 6px; border: 1px solid var(--line); background: var(--panel); color: var(--ink); font: inherit; font-weight: 600; cursor: pointer; white-space: nowrap; }
.btn:hover { border-color: var(--brand); text-decoration: none; }
.btn.primary { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); }
.btn.danger { color: var(--bad); border-color: var(--bad); }
.btn.danger.solid { background: var(--bad); color: #fff; }
.btn.small { padding: 5px 10px; font-size: 13px; }
.btn.link { border: 0; background: none; color: var(--brand); padding: 0; font-weight: 500; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.pager { display: flex; gap: 8px; align-items: center; justify-content: flex-end; margin-top: 12px; }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 16px; overflow-x: auto; }
.tabs a { padding: 8px 12px; color: var(--muted); border-bottom: 2px solid transparent; white-space: nowrap; }
.tabs a.on { color: var(--brand); border-bottom-color: var(--brand); font-weight: 600; }
.tabs a:hover { text-decoration: none; color: var(--ink); }
.empty { padding: 28px; text-align: center; color: var(--muted); }
details summary { cursor: pointer; font-weight: 600; }
code, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; }

/* Login */
.bare { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login { width: 100%; max-width: 380px; }
.login .card { padding: 24px; }

/* Receipt */
.receipt { max-width: 420px; margin: 0 auto; }
.receipt .head { text-align: center; border-bottom: 1px dashed var(--line); padding-bottom: 12px; margin-bottom: 12px; }
.receipt .amount { font-size: 30px; font-weight: 800; text-align: center; margin: 8px 0; }
@media print {
  .topbar, .no-print, .flash { display: none !important; }
  body { background: #fff; color: #000; }
  main { padding: 0; }
  .card { border: 0; box-shadow: none; }
}
@media (max-width: 640px) {
  .who .name { display: none; }
  dl.kv { grid-template-columns: 110px 1fr; }
  h1 { font-size: 19px; }
}

/* Small utilities (the security policy blocks inline style="", so everything lives here) */
.text-center { text-align: center; }
.mb-16 { margin-bottom: 16px; }
.mt-0 { margin-top: 0; }
.w-full { width: 100%; }
.narrow { max-width: 460px; }
.mid { max-width: 640px; margin: 40px auto; }
.inline { display: inline; }
.hidden { display: none; }