:root {
  color-scheme: light;
  --bg: #f4f6f3;
  --paper: #fffef9;
  --ink: #17211c;
  --muted: #5d6862;
  --line: #2a312d;
  --soft-line: #c9d0c8;
  --accent: #1f6f68;
  --accent-2: #b5532d;
  --calc: #eef7f3;
  --input: #fbfcff;
  --shadow: 0 16px 44px rgba(31, 42, 35, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.45;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px clamp(16px, 4vw, 44px);
  border-bottom: 1px solid var(--soft-line);
  background: #eaf0ed;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(1.55rem, 3vw, 2.35rem);
}

h2 {
  margin: 28px 0 8px;
  font-size: 1.2rem;
}

h3 {
  margin-bottom: 10px;
  font-size: 1rem;
}

button,
input,
select {
  font: inherit;
}

.print-button,
.secondary-button,
.tab-button {
  min-height: 40px;
  border: 1px solid var(--accent);
  background: #ffffff;
  color: var(--accent);
  font-weight: 700;
  cursor: pointer;
}

.print-button {
  padding: 8px 14px;
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.secondary-button {
  padding: 8px 14px;
  border-color: var(--accent-2);
  color: var(--accent-2);
}

.tabs {
  display: flex;
  gap: 8px;
  padding: 14px clamp(16px, 4vw, 44px) 0;
}

.tab-button {
  padding: 8px 18px;
  border-bottom-width: 3px;
}

.tab-button.active {
  background: var(--accent);
  color: #fff;
}

main {
  padding: 18px clamp(12px, 3vw, 36px) 48px;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.sheet {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: clamp(14px, 3vw, 28px);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.method,
.note {
  color: var(--muted);
}

.print-note {
  margin: 0 0 18px;
  padding: 10px 12px;
  border-left: 4px solid var(--accent);
  background: #f4faf7;
  color: var(--muted);
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin: 16px 0 18px;
}

label {
  display: grid;
  gap: 5px;
  font-weight: 700;
}

input,
select {
  width: 100%;
  min-height: 34px;
  border: 1px solid var(--soft-line);
  background: var(--input);
  color: var(--ink);
  padding: 6px 8px;
}

input:focus,
select:focus {
  outline: 2px solid rgba(31, 111, 104, 0.25);
  border-color: var(--accent);
}

.inline-fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(90px, 1fr));
  gap: 8px;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 14px 0 22px;
}

.table-wrap.compact {
  margin-bottom: 0;
}

.report-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  background: #fff;
  table-layout: fixed;
}

.identity-table {
  min-width: 620px;
}

.standards-table {
  min-width: 640px;
}

.report-table th,
.report-table td {
  border: 1px solid var(--line);
  padding: 7px;
  text-align: center;
  vertical-align: middle;
  word-break: normal;
}

.report-table th {
  background: #eef1ec;
  font-weight: 700;
}

.report-table td:first-child {
  width: 54px;
}

.report-table input {
  min-width: 72px;
  border-color: #b8c1bb;
  text-align: center;
}

.identity-table input {
  text-align: left;
}

.computed {
  background: var(--calc);
  font-weight: 700;
}

.check-cell {
  width: 80px;
}

.check-cell input {
  width: 22px;
  min-width: 22px;
  height: 22px;
  min-height: 22px;
  accent-color: var(--accent);
}

.chart-panel,
.explanation {
  margin-top: 18px;
  padding: 16px;
  border: 1px solid var(--soft-line);
  background: #fbfcfb;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--soft-line);
  background: #fff;
}

.calc-list {
  display: grid;
  gap: 10px;
}

.calc-item {
  padding: 10px;
  border-left: 4px solid var(--accent);
  background: #fff;
}

.calc-item.warning {
  border-left-color: var(--accent-2);
  color: #6e2c18;
}

.invalid-input {
  border-color: var(--accent-2);
  background: #fff5f0;
}

.formula {
  display: block;
  margin-top: 4px;
  color: #26332e;
  font-family: "Courier New", Courier, monospace;
  white-space: normal;
}

.result-ok {
  color: #185f40;
  font-weight: 700;
}

.result-warn {
  color: #9b3f20;
  font-weight: 700;
}

@media (max-width: 720px) {
  .app-header {
    align-items: stretch;
    flex-direction: column;
  }

  .tabs {
    flex-direction: column;
  }

  .sheet {
    padding: 12px;
  }

  .inline-fields {
    grid-template-columns: 1fr;
  }

  .header-actions {
    justify-content: stretch;
  }

  .header-actions button {
    width: 100%;
  }
}

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

  .app-header,
  .tabs,
  .print-button,
  .secondary-button {
    display: none;
  }

  main {
    padding: 0;
  }

  .tab-panel {
    display: block;
    break-after: page;
  }

  .tab-panel:not(.active) {
    display: none;
  }

  .sheet {
    box-shadow: none;
    padding: 0;
  }

  .table-wrap {
    overflow: visible;
  }

  .report-table {
    min-width: 0;
    font-size: 10pt;
  }

  input,
  select {
    border: 0;
    background: transparent;
    padding: 0;
  }

  .chart-panel,
  .explanation {
    break-inside: avoid;
  }
}