:root {
  --blue: #1a4f7a;
  --blue-light: #e8f2fb;
  --green: #2e9e5b;
  --red: #d64545;
  --amber: #e0922f;
  --grey: #6b7785;
  --border: #e2e8f0;
  --bg: #f4f6f9;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg); color: #1f2933; font-size: 14px; }
.hidden { display: none !important; }
.muted { color: var(--grey); }
.error { color: var(--red); margin-top: 8px; min-height: 18px; }
button { cursor: pointer; font-family: inherit; }

/* ── Logowanie ── */
.auth-screen { min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.auth-card { background: #fff; padding: 36px; border-radius: 14px; width: 360px;
  box-shadow: 0 10px 40px rgba(0,0,0,.08); }
.auth-card h1 { color: var(--blue); margin-bottom: 6px; }
.auth-card form { display: flex; flex-direction: column; gap: 12px; margin-top: 20px; }
.auth-card input { padding: 11px 14px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; }
.auth-card button { padding: 12px; background: var(--blue); color: #fff; border: none;
  border-radius: 8px; font-size: 15px; font-weight: 600; }

/* ── Topbar ── */
.topbar { background: #fff; border-bottom: 1px solid var(--border); display: flex;
  align-items: center; gap: 20px; padding: 0 20px; height: 56px; position: sticky; top: 0; z-index: 10; }
.brand { font-weight: 700; color: var(--blue); font-size: 18px; }
.brand span { font-weight: 400; color: var(--grey); }
.tabs { display: flex; gap: 4px; flex: 1; }
.tab { background: none; border: none; padding: 8px 14px; border-radius: 8px; font-size: 14px;
  color: var(--grey); position: relative; }
.tab.active { background: var(--blue-light); color: var(--blue); font-weight: 600; }
.badge { background: var(--red); color: #fff; border-radius: 10px; padding: 1px 7px;
  font-size: 11px; font-weight: 700; margin-left: 4px; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.topbar-right button { background: none; border: 1px solid var(--border); border-radius: 8px;
  padding: 6px 12px; color: var(--grey); }
#refresh-btn { font-size: 18px; padding: 4px 10px; }

/* ── Treść ── */
main { padding: 22px; max-width: 1100px; margin: 0 auto; }
h2 { color: var(--blue); margin-bottom: 16px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 18px; }

/* Dashboard */
.dash-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px,1fr)); gap: 14px; margin-bottom: 24px; }
.stat { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.stat .label { color: var(--grey); font-size: 13px; }
.stat .count { font-size: 28px; font-weight: 700; margin: 4px 0; }
.stat .sum { font-size: 13px; color: var(--grey); }
.stat.overdue { border-left: 4px solid var(--red); }
.stat.today { border-left: 4px solid var(--amber); }
.stat.tomorrow { border-left: 4px solid var(--blue); }
.stat.week { border-left: 4px solid var(--green); }

/* Tabela faktur */
table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden;
  border: 1px solid var(--border); }
th { background: var(--blue); color: #fff; text-align: left; padding: 10px 12px; font-size: 13px; }
td { padding: 10px 12px; border-top: 1px solid var(--border); font-size: 13px; }
tbody tr { cursor: pointer; }
tbody tr:hover { background: var(--blue-light); }
.right { text-align: right; }
.pill { display: inline-block; padding: 2px 9px; border-radius: 12px; font-size: 11px; font-weight: 600; }
.pill.paid { background: #e3f5e9; color: var(--green); }
.pill.unpaid { background: #fde9e9; color: var(--red); }
.pill.overdue { background: var(--red); color: #fff; }
.pill.soon { background: #fdf0db; color: var(--amber); }
.dot-new { display: inline-block; width: 8px; height: 8px; background: var(--red); border-radius: 50%; margin-right: 6px; }

.toolbar { display: flex; gap: 10px; margin-bottom: 14px; align-items: center; flex-wrap: wrap; }
.toolbar input, .toolbar select { padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px; }
.btn { padding: 8px 14px; background: var(--blue); color: #fff; border: none; border-radius: 8px; font-weight: 600; }
.btn.ghost { background: #fff; color: var(--blue); border: 1px solid var(--blue); }
.btn.sm { padding: 5px 10px; font-size: 12px; }

/* Detail panel */
.overlay { position: fixed; inset: 0; background: rgba(0,0,0,.4); display: flex; justify-content: flex-end; z-index: 50; }
.detail-panel { background: #fff; width: 460px; max-width: 100%; height: 100%; overflow-y: auto; padding: 26px; position: relative; }
.close { position: absolute; top: 14px; right: 18px; font-size: 26px; background: none; border: none; color: var(--grey); }
.detail-row { display: flex; justify-content: space-between; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--border); gap: 10px; }
.detail-row .k { color: var(--grey); font-size: 12px; }
.detail-row .v { font-weight: 600; text-align: right; word-break: break-word; }
.copy-btn { background: var(--blue-light); border: none; border-radius: 6px; padding: 3px 8px; color: var(--blue); font-size: 11px; margin-left: 6px; }
.qr-box { text-align: center; background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 14px; margin-bottom: 14px; }
.qr-img { width: 200px; height: 200px; }
.qr-label { color: var(--grey); font-size: 12px; margin-top: 6px; }

/* Kalendarz */
.cal-grid { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 6px; width: 100%; }
.cal-head { font-weight: 600; color: var(--grey); text-align: center; padding: 6px; font-size: 12px; }
.cal-cell { background: #fff; border: 1px solid var(--border); border-radius: 8px; min-height: 84px; padding: 6px; font-size: 12px; min-width: 0; overflow: hidden; }
.cal-cell.empty { background: transparent; border: none; }
.cal-cell .day { color: var(--grey); font-weight: 600; }
.cal-cell.has-due { border-color: var(--amber); }
.cal-cell.overdue { border-color: #d23b3b; background: #fdecec; }
.cal-event { background: var(--blue-light); border-radius: 5px; padding: 2px 5px; margin-top: 3px; cursor: pointer;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cal-event.overdue { background: #f7c5c5; color: #8a1f1f; font-weight: 600; }
.cal-nav { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }

.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: #1f2933; color: #fff; padding: 12px 22px; border-radius: 10px; z-index: 100;
  box-shadow: 0 8px 24px rgba(0,0,0,.2); }

.list-item { display: flex; justify-content: space-between; align-items: center;
  padding: 12px; border-bottom: 1px solid var(--border); }
.empty { text-align: center; color: var(--grey); padding: 40px; }

/* Kolumna zaznaczania faktur (bulk „Opłacona") */
th.cb, td.cb { width: 44px; text-align: center; cursor: pointer; }
td.cb { padding: 6px; }                 /* większy obszar klikania */
th.cb input, td.cb input {
  width: 20px; height: 20px;            /* większy checkbox */
  cursor: pointer;
  accent-color: #1a4f7a;
}
#bulk-paid:disabled { opacity: .5; cursor: default; }

/* Suma zaznaczonych faktur (pomoc przy przelewie zbiorczym) */
.bulk-sum { margin-left: 12px; font-weight: 600; color: #1a4f7a; }