:root {
  --bg: #dcdcdc;
  --paper: #efefef;
  --line: #b9b9b9;
  --ink: #171717;
  --muted: #7b7b7b;
  --action: #1f3a56;
  --danger: #9a2f2f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Courier New", Courier, monospace;
  color: var(--ink);
  background: radial-gradient(circle at 10% 5%, #f5f5f5 0, #d9d9d9 45%, #cbcbcb 100%);
}

.layout {
  max-width: 1540px;
  margin: 0 auto;
  padding: 1rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 1024px) {
  .layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

.panel {
  background: #f5f5f5;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  min-width: 0;
}

.preview-panel {
  position: sticky;
  top: 1rem;
  height: fit-content;
}

@media (max-width: 1023px) {
  .preview-panel {
    position: static;
  }
}

h1,
h2,
h3,
h4 {
  margin: 0.25rem 0 0.8rem;
}

h1 {
  font-size: 1.32rem;
  letter-spacing: 0.05em;
}

h2 {
  font-size: 1rem;
  letter-spacing: 0.05em;
}

form {
  display: grid;
  gap: 0.85rem;
}

.grid {
  display: grid;
  gap: 0.7rem;
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 760px) {
  .grid.two,
  .grid.three,
  .grid.four {
    grid-template-columns: 1fr;
  }
}

label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.89rem;
  font-weight: 700;
}

input,
select,
button,
textarea {
  font: inherit;
}

input,
select,
textarea {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.5rem 0.55rem;
  background: #fafafa;
  width: 100%;
}

select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, #555 50%), linear-gradient(135deg, #555 50%, transparent 50%);
  background-position: calc(100% - 15px) calc(50% - 3px), calc(100% - 10px) calc(50% - 3px);
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 1.9rem;
}

input:focus,
select:focus,
textarea:focus,
button:focus {
  outline: 2px solid rgba(31, 58, 86, 0.22);
  outline-offset: 1px;
}

button {
  border: 0;
  border-radius: 8px;
  padding: 0.56rem 0.88rem;
  color: #fff;
  background: var(--action);
  cursor: pointer;
  letter-spacing: 0.04em;
}

button.secondary {
  background: #2b495f;
}

button.danger {
  background: var(--danger);
}

.icon-btn {
  width: 2rem;
  height: 2rem;
  min-width: 2rem;
  padding: 0;
  border-radius: 6px;
  background: #fff;
  color: #111;
  border: 1px solid #d0d0d0;
  line-height: 0;
  display: inline-grid;
  place-items: center;
}

.icon-btn svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.35rem;
}

.tax-id-row {
  display: grid;
  grid-template-columns: minmax(170px, 1fr) minmax(0, 1fr);
  gap: 0.5rem;
  align-items: center;
}

.tax-type-select,
.tax-type-custom {
  grid-column: 1;
}

.tax-id-input {
  grid-column: 2;
}

.tax-id-row.other-mode {
  grid-template-columns: minmax(130px, 0.85fr) minmax(150px, 1fr) minmax(0, 1fr);
}

.tax-id-row.other-mode .tax-type-select {
  grid-column: 1;
}

.tax-id-row.other-mode .tax-type-custom {
  grid-column: 2;
}

.tax-id-row.other-mode .tax-id-input {
  grid-column: 3;
}

.item-row {
  display: grid;
  gap: 0.5rem;
  grid-template-columns: 2.2fr 1.2fr 0.8fr 1fr 0.9fr auto;
  align-items: end;
  margin-bottom: 0.5rem;
}

@media (max-width: 1200px) {
  .item-row {
    grid-template-columns: 1fr 1fr;
  }

  .item-row .icon-btn {
    justify-self: start;
  }
}

@media (max-width: 560px) {
  .item-row {
    grid-template-columns: 1fr;
  }

  .tax-id-row {
    grid-template-columns: 1fr;
  }

  .tax-type-select,
  .tax-type-custom,
  .tax-id-input {
    grid-column: auto;
  }
}

.hidden {
  display: none !important;
}

.tax-fields {
  border: 1px dashed var(--line);
  border-radius: 9px;
  padding: 0.75rem;
  background: #f8f8f8;
}

.invoice-preview {
  min-height: 160px;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.invoice-preview.empty {
  color: var(--muted);
}

.invoice-paper {
  padding: 0.35rem;
  font-size: 0.88rem;
  line-height: 1.32;
}

.invoice-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 300px);
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 1.2rem;
}

.invoice-title-block {
  justify-self: end;
  align-self: flex-start;
  width: 100%;
}

.invoice-title-head {
  text-align: right;
}

.brand-name {
  font-size: clamp(1.05rem, 1.4vw, 1.3rem);
  margin: 0;
  line-height: 1.05;
  letter-spacing: 0.01em;
}

.muted {
  color: var(--muted);
  overflow-wrap: anywhere;
}

.invoice-word {
  font-size: clamp(1.45rem, 2.3vw, 2rem);
  margin: 0;
  line-height: 0.98;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.invoice-no {
  text-align: right;
  color: var(--muted);
  font-size: clamp(0.84rem, 1.1vw, 0.98rem);
}

.invoice-meta {
  margin-top: 0.45rem;
  display: grid;
  gap: 0.2rem;
  text-align: right;
  width: 100%;
}

.invoice-meta-row {
  font-size: 0.74rem;
  color: var(--muted);
}

.invoice-mid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.2rem;
  margin-bottom: 0.9rem;
}

.bill-name {
  font-size: clamp(0.95rem, 1.25vw, 1.15rem);
  margin-bottom: 0.2rem;
}

.date-block {
  text-align: right;
  margin-bottom: 0.75rem;
}

.date-label {
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-weight: 700;
  color: var(--muted);
  font-size: 0.7rem;
}

.date-value {
  font-size: clamp(0.94rem, 1.2vw, 1.08rem);
  margin-top: 0.15rem;
}

.preview-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.2rem;
}

.preview-table th,
.preview-table td {
  padding: 0.54rem 0.32rem;
  text-align: left;
  border-bottom: 1px solid #c9c9c9;
  vertical-align: top;
  font-size: 0.84rem;
}

.preview-table thead th {
  text-transform: uppercase;
  border-bottom: 3px solid #2a2a2a;
  letter-spacing: 0.08em;
  font-size: 0.72rem;
}

.number {
  text-align: right;
}

.summary {
  margin-left: auto;
  width: min(360px, 100%);
  display: grid;
  gap: 0.24rem;
  margin-bottom: 1rem;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.15rem 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.summary-row.amount {
  color: var(--ink);
}

.summary-row.total {
  border-top: 2px solid #c4c4c4;
  margin-top: 0.3rem;
  padding-top: 0.62rem;
  font-size: clamp(1.02rem, 1.6vw, 1.36rem);
  font-weight: 700;
  color: var(--ink);
}

.invoice-footer {
  border-top: 1px solid #c4c4c4;
  margin-top: 1.2rem;
  padding-top: 0.75rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.6rem;
}

.payment-title {
  font-size: 0.86rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-bottom: 0.45rem;
}

.payment-grid {
  display: grid;
  gap: 0.28rem;
}

.data-row {
  display: grid;
  grid-template-columns: 1.05fr 2fr;
  gap: 0.42rem;
  align-items: baseline;
  font-size: 0.82rem;
}

.data-label {
  color: var(--muted);
}

.tax-inline {
  margin-top: 0.2rem;
}

.meta-note {
  margin-top: 0.4rem;
  color: var(--muted);
}

@media (max-width: 980px) {
  .invoice-top,
  .invoice-mid,
  .invoice-footer {
    grid-template-columns: 1fr;
    display: grid;
  }

  .invoice-no,
  .date-block,
  .invoice-meta,
  .invoice-title-head {
    text-align: left;
  }

  .invoice-title-block {
    justify-self: start;
  }

  .summary {
    margin-left: 0;
  }

  .data-row {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .preview-table {
    display: block;
    overflow-x: auto;
  }
}

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

  .layout,
  .panel {
    margin: 0;
    max-width: 100%;
    box-shadow: none;
    border: 0;
    padding: 0;
  }

  .form-panel {
    display: none;
  }

  .preview-panel {
    width: 100%;
    border: 0;
    position: static;
  }

  .invoice-preview {
    border: 0;
    padding: 0;
    background: #fff;
  }
}