:root {
  --blue: #2554e8;
  --blue-dark: #1a2340;
  --ink: #1a2233;
  --muted: #6b7488;
  --faint: #8a91a3;
  --border: #e6e9f0;
  --bg: #f4f6fb;
  --card: #ffffff;
  --amber: #f5a623;
  --green: #1a7a3d;
  --green-bg: #dcf5e3;
  --blue-bg: #dce8fd;
  --amber-bg: #fff3d6;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

button {
  font-family: inherit;
  cursor: pointer;
}

input, select, textarea {
  font-family: inherit;
  font-size: 14px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 28px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand img { height: 26px; }
.brand .app-name { font-weight: 700; font-size: 16px; color: var(--blue-dark); letter-spacing: 0.01em; }

.nav { display: flex; gap: 6px; }
.nav-btn {
  background: transparent;
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
}
.nav-btn:hover { background: var(--bg); }
.nav-btn.active { background: var(--blue); color: #fff; }

#app { max-width: 1100px; margin: 0 auto; padding: 28px; }

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  gap: 12px;
  flex-wrap: wrap;
}
.panel-head h1 { font-size: 20px; margin: 0; }
.panel-head .sub { color: var(--muted); font-size: 13px; margin-top: 2px; }

.btn {
  border: 1px solid var(--border);
  background: #fff;
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn:hover { background: var(--bg); }
.btn.primary { background: var(--blue); border-color: var(--blue); color: #fff; }
.btn.primary:hover { background: #1c40c2; }
.btn.danger { color: #c53030; border-color: #f0c4c4; }
.btn.danger:hover { background: #fdf0f0; }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.ghost:hover { background: var(--bg); }
.btn.small { padding: 6px 11px; font-size: 12.5px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.search-row { display: flex; gap: 10px; margin-bottom: 16px; }
.search-row input { flex: 1; padding: 10px 14px; border-radius: 8px; border: 1px solid var(--border); }

table.list { width: 100%; border-collapse: collapse; }
table.list th {
  text-align: left; font-size: 11px; text-transform: uppercase; letter-spacing: 0.04em;
  color: var(--faint); border-bottom: 2px solid var(--border); padding: 8px 10px;
}
table.list td { padding: 12px 10px; border-bottom: 1px solid var(--border); font-size: 14px; }
table.list tr:hover td { background: #fafbfd; }
table.list td.num { text-align: right; font-variant-numeric: tabular-nums; }
table.list .row-actions { display: flex; gap: 6px; justify-content: flex-end; }
table.list .empty-row td { text-align: center; color: var(--muted); padding: 40px 0; }

.badge {
  display: inline-block; font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.03em; padding: 3px 10px; border-radius: 12px;
  background: var(--amber-bg); color: #92650c;
}
.badge.Paid { background: var(--green-bg); color: var(--green); }
.badge.Sent { background: var(--blue-bg); color: #1a4fc4; }

/* Invoice editor */
.editor-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 20px; }
.field { display: flex; flex-direction: column; gap: 5px; margin-bottom: 12px; }
.field label { font-size: 12px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 0.03em; }
.field input, .field select, .field textarea {
  padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px; color: var(--ink); background: #fff;
}
.field textarea { resize: vertical; min-height: 70px; line-height: 1.5; }
.field-row { display: flex; gap: 12px; }
.field-row .field { flex: 1; }

.section-title { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; color: var(--faint); margin: 24px 0 10px; }

.pkg-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.pkg-chip {
  border: 1px solid var(--border); background: #fafbfd; border-radius: 20px; padding: 7px 14px;
  font-size: 12.5px; font-weight: 600; color: var(--blue-dark);
}
.pkg-chip:hover { border-color: var(--blue); background: var(--blue-bg); }
.pkg-chip .price { color: var(--muted); font-weight: 400; margin-left: 4px; }

table.items-table { width: 100%; border-collapse: collapse; margin-bottom: 16px; }
table.items-table th {
  text-align: left; font-size: 11px; text-transform: uppercase; color: var(--faint);
  border-bottom: 2px solid var(--border); padding: 6px 8px;
}
table.items-table td { padding: 8px; border-bottom: 1px solid var(--border); vertical-align: top; }
table.items-table textarea { width: 100%; border: 1px solid transparent; padding: 6px; border-radius: 6px; resize: vertical; min-height: 36px; }
table.items-table textarea:focus, table.items-table input:focus { border-color: var(--blue); outline: none; background: #fbfcff; }
table.items-table input.qty { width: 60px; text-align: right; }
table.items-table input.rate { width: 100px; text-align: right; }
table.items-table input { border: 1px solid transparent; padding: 6px; border-radius: 6px; }
table.items-table td.amount { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; white-space: nowrap; }
table.items-table td.remove { text-align: center; width: 32px; }
.icon-btn { border: none; background: transparent; color: var(--faint); font-size: 16px; line-height: 1; padding: 4px; border-radius: 6px; }
.icon-btn:hover { color: #c53030; background: #fdf0f0; }

.totals-box { display: flex; justify-content: flex-end; margin-bottom: 20px; }
.totals-box table { min-width: 320px; font-size: 14px; }
.totals-box td { padding: 5px 0; }
.totals-box td.label { color: var(--muted); }
.totals-box td.val { text-align: right; font-variant-numeric: tabular-nums; }
.totals-box input.pct { width: 54px; text-align: right; border: 1px solid var(--border); border-radius: 6px; padding: 4px 6px; margin-right: 4px; }
.totals-box tr.grand td { border-top: 2px solid var(--blue-dark); padding-top: 10px; font-size: 18px; font-weight: 700; }

.editor-actions { display: flex; gap: 10px; justify-content: flex-end; flex-wrap: wrap; padding-top: 16px; border-top: 1px solid var(--border); }
.editor-actions .spacer { flex: 1; }

.client-picker { display: flex; gap: 8px; align-items: flex-end; }
.client-picker .field { flex: 1; margin-bottom: 0; }

.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--blue-dark); color: #fff; padding: 12px 20px; border-radius: 8px;
  font-size: 13.5px; opacity: 0; pointer-events: none; transition: all 0.2s ease; z-index: 100;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.settings-form { max-width: 640px; }

@media (max-width: 720px) {
  .editor-grid { grid-template-columns: 1fr; }
  #app { padding: 16px; }
}