:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #1c2430;
  --muted: #667085;
  --line: #e4e7ec;
  --accent: #1f6feb;
  --accent-text: #ffffff;
  --ok: #157f3b;
  --ok-bg: #e6f4ea;
  --warn: #b54708;
  --warn-bg: #fef0e6;
  --bad: #b42318;
  --bad-bg: #fde8e7;
  --chip: #eef1f5;
  --radius: 10px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1419;
    --panel: #171d24;
    --text: #e6e9ee;
    --muted: #98a2b3;
    --line: #2a323c;
    --accent: #4c8dff;
    --ok: #5ccf86;
    --ok-bg: #133222;
    --warn: #f6a35c;
    --warn-bg: #3a2414;
    --bad: #ff8a80;
    --bad-bg: #3b1715;
    --chip: #222a33;
  }
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font-size: 14px; line-height: 1.45; }
[hidden] { display: none !important; }
a { color: var(--accent); text-decoration: none; }
h1 { font-size: 22px; margin: 0; }
h2 { font-size: 16px; margin: 24px 0 8px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.error { color: var(--bad); margin: 0; }
.ok { color: var(--ok); margin: 0; font-weight: 600; }

/* Password field with its Show/Hide button inside the box */
.pw { position: relative; display: block; }
.pw input { width: 100%; padding-right: 64px; }
.pw-toggle { position: absolute; right: 4px; top: 50%; transform: translateY(-50%); padding: 3px 8px; font-size: 12px; font-weight: 600; color: var(--muted); }
.form-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; max-width: 420px; display: grid; gap: 14px; }
.form-card p { margin: 0; }
.form-card label { display: grid; gap: 6px; font-weight: 600; }

button { font: inherit; cursor: pointer; border-radius: 8px; border: 1px solid var(--line); background: var(--panel); color: var(--text); padding: 7px 12px; }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
button.link { border: 0; background: none; color: var(--accent); padding: 0; }
input { font: inherit; color: var(--text); background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 7px 10px; }
input:focus, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.brand { font-weight: 800; letter-spacing: -0.02em; font-size: 18px; }
.brand-lg { font-size: 30px; }

/* Sign-in */
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; width: 100%; max-width: 360px; display: grid; gap: 14px; }
.login-card p { margin: 0; }
.login-card label { display: grid; gap: 6px; font-weight: 600; }
.login-card button { margin-top: 4px; padding: 10px; }

/* Shell */
.topbar { display: flex; align-items: center; gap: 24px; padding: 10px 24px; background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 1; }
.topbar nav { display: flex; gap: 16px; flex: 1; }
.topbar nav a { color: var(--muted); font-weight: 600; padding: 6px 0; border-bottom: 2px solid transparent; }
.topbar nav a.active { color: var(--text); border-color: var(--accent); }
.who { display: flex; gap: 12px; align-items: center; }
.page { max-width: 1200px; margin: 0 auto; padding: 24px; }
.page-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }

/* List */
.filters { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 16px; }
#f-q { flex: 1 1 260px; }
.segmented { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.segmented button { border: 0; border-radius: 0; border-right: 1px solid var(--line); }
.segmented button:last-child { border-right: 0; }
.segmented button.on { background: var(--accent); color: var(--accent-text); }
.date { display: inline-flex; gap: 6px; align-items: center; color: var(--muted); }
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-bottom: 16px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 16px; }
.card-label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; }
.card-value { font-size: 20px; font-weight: 700; font-variant-numeric: tabular-nums; }
.table-wrap { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); overflow-x: auto; }
table.grid { width: 100%; border-collapse: collapse; }
.grid th, .grid td { padding: 9px 12px; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
.grid td.wrap { white-space: normal; min-width: 160px; }
.grid th { font-size: 12px; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.grid tbody tr:last-child td { border-bottom: 0; }
#list-table tbody tr { cursor: pointer; }
#list-table tbody tr:hover { background: var(--chip); }
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; font-weight: 600; background: var(--chip); color: var(--muted); }
.badge.paid { background: var(--ok-bg); color: var(--ok); }
.badge.owing { background: var(--warn-bg); color: var(--warn); }
.badge.overdue { background: var(--bad-bg); color: var(--bad); }

/* Forms */
a.button { display: inline-block; border-radius: 8px; padding: 7px 14px; border: 1px solid var(--line); }
a.button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
select { font: inherit; color: var(--text); background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 7px 8px; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px 18px; margin: 18px 0; }
.form-grid label { display: grid; gap: 6px; font-weight: 600; }
.form-grid label.span2 { grid-column: span 2; }
.form-grid label.check { display: flex; align-items: center; gap: 8px; font-weight: 500; align-self: end; padding-bottom: 8px; }
.lines input, .lines select { width: 100%; min-width: 0; }
.lines td { white-space: normal; padding: 6px 6px; vertical-align: top; }
.lines td.desc { min-width: 220px; }
.lines td.n { width: 90px; }
.lines td.acct { min-width: 170px; }
.lines td.amt { padding-top: 13px; }
.lines .remove { padding: 4px 9px; color: var(--muted); }
#inv-add-line { margin-top: 10px; }
.actions { display: flex; gap: 14px; align-items: center; margin-top: 18px; flex-wrap: wrap; }
.notice { background: var(--warn-bg); color: var(--warn); padding: 10px 14px; border-radius: 8px; margin: 12px 0 0; }
.flash { background: var(--ok-bg); color: var(--ok); padding: 10px 14px; border-radius: 8px; margin: 0 0 16px; font-weight: 600; }
.flash.warn { background: var(--warn-bg); color: var(--warn); }
.flash-wrap { padding-bottom: 0; }
.flash-wrap .flash { margin: 0; }
.flash-wrap + .page { padding-top: 16px; }
.confirm { border: 1px solid var(--accent); border-radius: var(--radius); padding: 14px 16px; margin-top: 16px; }
.confirm p { margin: 0; font-weight: 600; }
.settings h2 { margin-top: 0; }
.settings p { max-width: 640px; }

/* Detail */
.back { display: inline-block; margin-bottom: 12px; font-weight: 600; }
.doc { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.doc-head { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: flex-start; }
.doc-head h1 { display: flex; gap: 10px; align-items: center; }
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px 24px; margin: 20px 0; }
.facts div span { display: block; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; }
.totals { margin-left: auto; width: min(100%, 340px); margin-top: 12px; }
.totals div { display: flex; justify-content: space-between; padding: 4px 0; font-variant-numeric: tabular-nums; }
.totals .strong { font-weight: 700; border-top: 1px solid var(--line); padding-top: 8px; margin-top: 4px; }
.totals .due { font-size: 18px; }

@media (max-width: 720px) {
  .topbar { flex-wrap: wrap; gap: 8px 16px; padding: 10px 16px; }
  .who #who-user { display: none; }
  .page { padding: 16px; }
  .cards { grid-template-columns: 1fr; }
  .form-grid label.span2 { grid-column: auto; }
  .doc { padding: 16px; }
}