:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --ink: #1c2129;
  --muted: #6b7280;
  --line: #e3e6eb;
  --accent: #1e4a7d;
  --accent-soft: #e8eef6;
  --good: #12704a;
  --good-soft: #e3f4ec;
  --warn: #9a5b00;
  --warn-soft: #fdf1dc;
  --bad: #b3261e;
  --bad-soft: #fbe7e5;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 1px 3px rgba(16, 24, 40, .06);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121418; --panel: #1b1e24; --ink: #e8eaee; --muted: #9aa1ad; --line: #2c3139;
    --accent: #7fb0e8; --accent-soft: #1f2d3e; --good: #5fd49b; --good-soft: #17301f;
    --warn: #f2b35a; --warn-soft: #33270f; --bad: #f28b82; --bad-soft: #3a1c1a;
    --shadow: none; color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 22px; margin: 0; letter-spacing: -.01em; }
h2 { font-size: 15px; margin: 0 0 12px; }
h3 { font-size: 13px; margin: 0 0 8px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.nowrap { white-space: nowrap; }

/* shell */
.shell { display: grid; grid-template-columns: 220px 1fr; min-height: 100vh; }
.sidebar { background: var(--panel); border-right: 1px solid var(--line); padding: 20px 14px; display: flex; flex-direction: column; gap: 22px; position: sticky; top: 0; height: 100vh; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 15px; padding: 0 6px; }
.brand small { display: block; font-weight: 500; font-size: 11px; color: var(--muted); }
.brand.big { font-size: 18px; justify-content: center; margin-bottom: 8px; }
.logo { width: 34px; height: 34px; }
nav { display: flex; flex-direction: column; gap: 2px; }
nav a { padding: 8px 10px; border-radius: 8px; color: var(--ink); display: flex; align-items: center; justify-content: space-between; }
nav a:hover { background: var(--bg); text-decoration: none; }
nav a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.badge-dot { background: var(--bad); color: #fff; border-radius: 10px; font-size: 11px; padding: 0 7px; font-weight: 700; }
.logout { margin-top: auto; text-align: left; padding: 8px 10px; }
.main { padding: 28px 32px 60px; max-width: 1180px; width: 100%; }

/* page header */
.page-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; }
.page-head .sub { color: var(--muted); margin-top: 2px; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

/* cards & grid */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; }
.card + .card, .card + .grid, .grid + .card, .grid + .grid { margin-top: 16px; }
.grid { display: grid; gap: 16px; }
.grid > .card, .grid > div > .card:first-child { margin-top: 0; }
.grid.kpis { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.split { grid-template-columns: 2fr 1fr; }
.kpi .label { color: var(--muted); font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.kpi .value { font-size: 24px; font-weight: 700; margin-top: 4px; font-variant-numeric: tabular-nums; }
.kpi .hint { color: var(--muted); font-size: 12px; margin-top: 2px; }
.kpi.bad .value { color: var(--bad); }
.card.flush { padding: 0; overflow: hidden; }
.card.flush > h2 { padding: 16px 18px 0; }

/* tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
th { font-size: 11.5px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; background: var(--bg); }
tbody tr:last-child td { border-bottom: 0; }
tr.clickable { cursor: pointer; }
tr.clickable:hover td { background: var(--bg); }
.empty { padding: 28px; text-align: center; color: var(--muted); }

/* status pills */
.pill { display: inline-block; padding: 2px 9px; border-radius: 20px; font-size: 12px; font-weight: 600; white-space: nowrap; }
.pill.draft { background: var(--bg); color: var(--muted); border: 1px solid var(--line); }
.pill.sent { background: var(--accent-soft); color: var(--accent); }
.pill.overdue { background: var(--bad-soft); color: var(--bad); }
.pill.paid { background: var(--good-soft); color: var(--good); }
.pill.cancelled { background: var(--bg); color: var(--muted); text-decoration: line-through; }
.pill.part { background: var(--warn-soft); color: var(--warn); }

/* tabs */
.tabs { display: flex; gap: 4px; margin-bottom: 14px; flex-wrap: wrap; }
.tabs a { padding: 6px 12px; border-radius: 20px; color: var(--muted); font-weight: 500; }
.tabs a.active { background: var(--ink); color: var(--panel); }
.tabs a:hover { text-decoration: none; }

/* buttons */
.btn { appearance: none; border: 1px solid var(--line); background: var(--panel); color: var(--ink); padding: 8px 14px; border-radius: 8px; font: inherit; font-weight: 600; cursor: pointer; white-space: nowrap; display: inline-flex; align-items: center; gap: 6px; }
.btn:hover { border-color: var(--muted); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--panel); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.danger { color: var(--bad); }
.btn.small { padding: 4px 10px; font-size: 12.5px; }
.btn:disabled { opacity: .55; cursor: default; }
.link { background: none; border: 0; color: var(--accent); cursor: pointer; font: inherit; padding: 0; }
.link.danger { color: var(--bad); }

/* forms */
form .row { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); margin-bottom: 12px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 12.5px; font-weight: 600; color: var(--muted); }
label.check { flex-direction: row; align-items: center; gap: 8px; color: var(--ink); font-weight: 500; font-size: 14px; }
input, select, textarea { font: inherit; font-weight: 400; color: var(--ink); background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; width: 100%; min-width: 0; }
input[type=checkbox] { width: auto; }
textarea { resize: vertical; min-height: 70px; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.help { font-size: 12px; color: var(--muted); font-weight: 400; }
fieldset { border: 0; padding: 0; margin: 0; }

/* line editor */
.lines th, .lines td { padding: 6px 6px; border-bottom: 0; }
.lines th { background: none; }
.lines td input, .lines td select { padding: 7px 8px; }
.lines .desc { width: 46%; }
.lines .qty { width: 9%; }
.lines .unit { width: 12%; }
.lines .rate { width: 13%; }
.lines .amt { width: 14%; }
.totals { margin-left: auto; width: 300px; max-width: 100%; }
.totals div { display: flex; justify-content: space-between; padding: 4px 0; }
.totals .grand { border-top: 1px solid var(--line); margin-top: 6px; padding-top: 8px; font-weight: 700; font-size: 16px; }

/* detail list */
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; }

/* notices */
.notice { padding: 10px 14px; border-radius: 8px; background: var(--warn-soft); color: var(--warn); margin-bottom: 16px; }
.notice.bad { background: var(--bad-soft); color: var(--bad); }
.notice.good { background: var(--good-soft); color: var(--good); }
.notice.info { background: var(--accent-soft); color: var(--accent); }
ul.plain { list-style: none; padding: 0; margin: 0; }
ul.plain li { padding: 8px 0; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; gap: 12px; }
ul.plain li:last-child { border-bottom: 0; }
.activity li { font-size: 13px; }

/* login */
.login { min-height: 100vh; display: grid; place-items: center; padding: 20px; }
.login-card { width: 340px; display: flex; flex-direction: column; gap: 14px; }
.error { color: var(--bad); margin: 0; min-height: 1em; }

/* toasts */
.toasts { position: fixed; bottom: 20px; right: 20px; display: flex; flex-direction: column; gap: 8px; z-index: 50; max-width: 420px; }
.toast { background: var(--ink); color: var(--panel); padding: 10px 14px; border-radius: 8px; box-shadow: 0 6px 20px rgba(0,0,0,.2); }
.toast.bad { background: var(--bad); color: #fff; }
.toast.warn { background: var(--warn); color: #fff; }

/* modal */
.modal-bg { position: fixed; inset: 0; background: rgba(15, 20, 30, .45); display: grid; place-items: center; z-index: 40; padding: 16px; }
.modal { background: var(--panel); border-radius: 12px; width: 640px; max-width: 100%; max-height: 90vh; overflow: auto; padding: 22px; }
.modal h2 { font-size: 18px; margin-bottom: 16px; }
.modal .foot { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; }

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; flex-direction: row; flex-wrap: wrap; align-items: center; padding: 10px 16px; gap: 10px; }
  nav { flex-direction: row; flex-wrap: wrap; }
  .logout { margin: 0 0 0 auto; }
  .main { padding: 18px 16px 50px; }
  .grid.kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid.two, .grid.split { grid-template-columns: 1fr; }
  .lines .desc { min-width: 200px; }
}