:root {
  --ink: #1a1a2e;
  --muted: #5c5c6b;
  --border: #d4d4dc;
  --accent: #0f3460;
  --paper: #ffffff;
  --panel: #f6f7f9;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: #e8eaef;
  line-height: 1.45;
}

.app {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.25rem;
  display: grid;
  grid-template-columns: minmax(280px, 360px) 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 960px) {
  .app {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  position: sticky;
  top: 1rem;
}

.panel h2 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
}

.field {
  margin-bottom: 0.65rem;
}

.field label {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 0.2rem;
}

.field input,
.field textarea,
.field select {
  width: 100%;
  padding: 0.45rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.875rem;
  font-family: inherit;
  background: var(--paper);
}

.field textarea {
  min-height: 52px;
  resize: vertical;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

button {
  cursor: pointer;
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.5rem 0.85rem;
  border-radius: 6px;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  filter: brightness(1.08);
}

.btn-secondary {
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: #eef0f4;
}

.btn-danger {
  background: #c0392b;
  color: #fff;
  font-size: 0.75rem;
  padding: 0.35rem 0.55rem;
}

.line-item-editor {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem;
  margin-bottom: 0.5rem;
  background: var(--paper);
}

.line-item-editor .row {
  display: grid;
  grid-template-columns: 1fr 70px 100px 100px;
  gap: 0.35rem;
  align-items: end;
}

@media (max-width: 500px) {
  .line-item-editor .row {
    grid-template-columns: 1fr 1fr;
  }
}

.line-item-editor .hs {
  grid-column: 1 / -1;
  margin-top: 0.35rem;
}

.line-item-editor .actions-row {
  grid-column: 1 / -1;
  margin-top: 0.4rem;
  text-align: right;
}

.invoice-wrap {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem 2.25rem;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
}

@media print {
  body {
    background: #fff;
  }

  .app {
    display: block;
    max-width: none;
    padding: 0;
  }

  .panel {
    display: none !important;
  }

  .invoice-wrap {
    border: none;
    border-radius: 0;
    box-shadow: none;
    padding: 0.5in;
  }
}

.invoice-header {
  text-align: center;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 1rem;
}

.invoice-header .company {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 0.35rem;
}

.invoice-header .meta {
  font-size: 0.8rem;
  color: var(--muted);
}

.invoice-title {
  text-align: center;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  margin: 1rem 0 1.25rem;
}

.bill-ship {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.25rem;
  font-size: 0.875rem;
}

@media (max-width: 600px) {
  .bill-ship {
    grid-template-columns: 1fr;
  }
}

.bill-ship strong {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.invoice-meta-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  font-size: 0.8125rem;
  margin-bottom: 1.25rem;
  padding: 0.65rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

@media (max-width: 640px) {
  .invoice-meta-row {
    grid-template-columns: 1fr;
  }
}

.invoice-meta-row span {
  color: var(--muted);
}

table.invoice-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
  margin-bottom: 0.75rem;
}

table.invoice-table th {
  text-align: left;
  padding: 0.5rem 0.4rem;
  border-bottom: 2px solid var(--ink);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

table.invoice-table th:nth-child(2),
table.invoice-table th:nth-child(3),
table.invoice-table th:nth-child(4) {
  text-align: right;
}

table.invoice-table td {
  padding: 0.55rem 0.4rem;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}

table.invoice-table td:nth-child(2),
table.invoice-table td:nth-child(3),
table.invoice-table td:nth-child(4) {
  text-align: right;
  white-space: nowrap;
}

.desc-sub {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 0.25rem;
}

.total-block {
  margin-top: 1rem;
  text-align: right;
  font-size: 0.9375rem;
}

.total-block .cif {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.total-block .say {
  font-style: italic;
  color: var(--muted);
  font-size: 0.85rem;
}

.declaration {
  margin-top: 2rem;
  font-size: 0.8125rem;
  line-height: 1.55;
}

.declaration strong {
  display: block;
  margin-bottom: 0.35rem;
  letter-spacing: 0.04em;
  font-size: 0.72rem;
  color: var(--muted);
}

.signature {
  margin-top: 2.5rem;
  font-size: 0.8125rem;
}

.signature .line {
  margin-top: 2.5rem;
  border-top: 1px solid var(--ink);
  max-width: 280px;
  padding-top: 0.35rem;
  color: var(--muted);
}