:root {
  --ink: #1a1d29;
  --ink-soft: #565b70;
  --paper: #ffffff;
  --bg: #f4f5f7;
  --line: #e4e6ec;
  --accent: #2f5cff;
  --accent-soft: #eef1ff;
  --paid: #1c9c6b;
  --paid-soft: #e7f8f1;
  --unpaid: #d8862c;
  --unpaid-soft: #fdf1e2;
  --danger: #d8384a;
  --radius: 10px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

.topbar { background: var(--paper); border-bottom: 1px solid var(--line); padding: 16px 0; }
.topbar .container { display: flex; align-items: center; justify-content: space-between; }
.brand { font-weight: 700; font-size: 18px; color: var(--ink); display: flex; align-items: center; gap: 8px; }
.brand .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--accent); display: inline-block; }

.nav-links a { color: var(--ink-soft); margin-left: 20px; font-weight: 500; font-size: 14px; }
.nav-links a:hover { color: var(--ink); text-decoration: none; }

.page { padding: 40px 0 80px; }

.card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }

h1 { font-size: 26px; margin: 0 0 6px; }
h2 { font-size: 18px; margin: 0 0 16px; }
.subtitle { color: var(--ink-soft); margin: 0 0 28px; font-size: 14px; }

.page-head { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 24px; flex-wrap: wrap; gap: 12px; }

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--accent); color: #fff; border: none;
  padding: 10px 18px; border-radius: 8px; font-size: 14px; font-weight: 600;
  cursor: pointer; text-decoration: none;
}
.btn:hover { background: #2249e6; text-decoration: none; }
.btn.secondary { background: var(--paper); color: var(--ink); border: 1px solid var(--line); }
.btn.secondary:hover { background: var(--bg); }
.btn.success { background: var(--paid); }
.btn.success:hover { background: #167e57; }
.btn.warn { background: var(--unpaid); }
.btn.warn:hover { background: #bb6f22; }
.btn.danger { background: var(--danger); }
.btn.small { padding: 6px 12px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 12px 10px; border-bottom: 1px solid var(--line); font-size: 14px; }
th { color: var(--ink-soft); font-weight: 600; font-size: 12.5px; text-transform: uppercase; letter-spacing: .04em; }
tr:last-child td { border-bottom: none; }
td.num, th.num { text-align: right; }

.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 12.5px; font-weight: 700; letter-spacing: .02em; }
.badge.paid { background: var(--paid-soft); color: var(--paid); }
.badge.unpaid { background: var(--unpaid-soft); color: var(--unpaid); }

.form-group { margin-bottom: 16px; }
.form-row { display: flex; gap: 16px; }
.form-row .form-group { flex: 1; }
label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--ink-soft); }
input[type=text], input[type=email], input[type=number], input[type=date], input[type=password], textarea, select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px;
  font-size: 14px; font-family: var(--font); background: var(--paper); color: var(--ink);
}
textarea { resize: vertical; min-height: 70px; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }

.section-title {
  font-size: 12.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em;
  color: var(--ink-soft); margin: 28px 0 12px;
}
.section-title:first-child { margin-top: 0; }

.items-table th, .items-table td { padding: 8px 6px; }
.items-table input { padding: 8px 10px; font-size: 13.5px; }
.remove-item { background: none; border: none; color: var(--danger); cursor: pointer; font-size: 18px; padding: 4px 8px; }

.totals-box { max-width: 320px; margin-left: auto; margin-top: 16px; }
.totals-row { display: flex; justify-content: space-between; padding: 6px 0; font-size: 14px; }
.totals-row.grand { font-size: 18px; font-weight: 700; border-top: 2px solid var(--ink); margin-top: 8px; padding-top: 12px; }

.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 20px; font-size: 14px; }
.alert.success { background: var(--paid-soft); color: var(--paid); }
.alert.error { background: #fdeced; color: var(--danger); }

.login-wrap { max-width: 380px; margin: 90px auto; }
.login-wrap .card { padding: 36px 32px; }
.login-wrap h1 { text-align: center; }
.login-wrap .subtitle { text-align: center; }

.empty-state { text-align: center; padding: 60px 20px; color: var(--ink-soft); }

.filters { display: flex; gap: 10px; margin-bottom: 18px; flex-wrap: wrap; }
.filters a, .filters button {
  padding: 7px 14px; border-radius: 999px; border: 1px solid var(--line); background: var(--paper);
  color: var(--ink-soft); font-size: 13.5px; font-weight: 600; cursor: pointer; text-decoration: none;
}
.filters a.active, .filters button.active { background: var(--ink); color: #fff; border-color: var(--ink); }
.search-box { flex: 1; min-width: 180px; }
.search-box input { padding: 8px 12px; }

/* ==== Invoice document view ==== */
.invoice-wrap { max-width: 820px; margin: 0 auto; }
.invoice-doc { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 48px; position: relative; overflow: hidden; }
.invoice-doc-head { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 36px; }
.invoice-logo { max-height: 60px; max-width: 220px; display: block; margin-bottom: 12px; object-fit: contain; object-position: left; }
.invoice-doc-head .biz-name { font-size: 20px; font-weight: 700; }
.invoice-doc-head .addr { color: var(--ink-soft); font-size: 13.5px; white-space: pre-line; margin-top: 4px; }
.invoice-doc-head .inv-meta { text-align: right; }
.invoice-doc-head .inv-meta .title { font-size: 26px; font-weight: 800; letter-spacing: .02em; }
.invoice-doc-head .inv-meta .num { color: var(--ink-soft); font-size: 13.5px; margin-top: 2px; }

.bill-to-row { display: flex; gap: 60px; margin-bottom: 32px; }
.bill-to-row .block-label { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-soft); margin-bottom: 6px; }
.bill-to-row .name { font-weight: 700; }
.bill-to-row .addr { color: var(--ink-soft); font-size: 13.5px; white-space: pre-line; }

.invoice-items-table th { border-bottom: 2px solid var(--ink); }
.invoice-notes { margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 13.5px; white-space: pre-line; }
.invoice-payment { margin-top: 18px; padding: 14px 16px; background: var(--bg); border-radius: 8px; font-size: 13.5px; white-space: pre-line; }
.invoice-payment .block-label { margin-bottom: 6px; }

.watermark {
  position: absolute; top: 46%; left: 50%; transform: translate(-50%, -50%) rotate(-28deg);
  font-size: 110px; font-weight: 900; letter-spacing: 8px; color: var(--paid); opacity: 0.16;
  border: 10px solid var(--paid); padding: 6px 34px; border-radius: 16px;
  pointer-events: none; user-select: none; z-index: 1; white-space: nowrap;
}
.invoice-doc-inner { position: relative; z-index: 2; }

.action-bar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; flex-wrap: wrap; gap: 10px; }
.action-bar .right { display: flex; gap: 10px; flex-wrap: wrap; }

.share-box {
  background: var(--accent-soft); border: 1px solid #d3ddff; border-radius: 8px; padding: 12px 14px;
  font-size: 13px; margin-bottom: 20px; display: flex; align-items: center; gap: 10px; justify-content: space-between;
}
.share-box code { background: #fff; padding: 4px 8px; border-radius: 6px; word-break: break-all; }

.footer-note { text-align: center; color: var(--ink-soft); font-size: 12.5px; margin-top: 30px; }

@media print {
  .no-print { display: none !important; }
  body { background: #fff; }
  .invoice-doc { border: none; padding: 0; }
  .page { padding: 0; }
}

@media (max-width: 640px) {
  .form-row { flex-direction: column; gap: 0; }
  .invoice-doc { padding: 24px; }
  .invoice-doc-head { flex-direction: column; gap: 16px; }
  .invoice-doc-head .inv-meta { text-align: left; }
  .invoice-logo { max-height: 48px; }
  .bill-to-row { flex-direction: column; gap: 16px; }
  .watermark { font-size: 60px; }
}