* {
  box-sizing: border-box;
}

:root {
  color-scheme: light;
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #d9e0ea;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --result-bg: #eef4ff;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #e8f0ff, var(--bg) 45%);
  color: var(--text);
  padding: 24px;
}

main {
  width: min(100%, 640px);
  margin: 0 auto;
  background: var(--card);
  border: 1px solid rgba(217, 224, 234, 0.9);
  border-radius: 22px;
  box-shadow: 0 20px 50px rgba(31, 41, 55, 0.12);
  overflow: hidden;
}

header {
  padding: 24px 24px 16px;
}

h1 {
  margin: 0;
  font-size: 26px;
  text-align: center;
}

.site-note {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
  text-align: center;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  padding: 0 24px 20px;
}

.tab-button {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 11px 12px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  background: #f8fafc;
  color: var(--text);
  transition: 0.15s ease;
}

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

.panel {
  display: none;
  padding: 0 24px 24px;
}

.panel.active {
  display: block;
}

.form-grid {
  display: grid;
  gap: 16px;
}

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

.full {
  grid-column: 1 / -1;
}

label {
  display: grid;
  gap: 7px;
  font-weight: 700;
}

.inline {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.unit,
.hint {
  color: var(--muted);
  font-weight: 500;
  font-size: 14px;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 11px 12px;
  font: inherit;
  outline: none;
  background: #fff;
  transition: 0.15s ease;
}

input[type="checkbox"] {
  width: auto;
}

.density-input {
  display: flex;
  align-items: center;
  gap: 8px;
}

.density-input #weightDensityInteger {
  flex: 0 0 30%;
  text-align: center;
}

.density-input #weightDensityDecimal {
  flex: 1;
  text-align: center;
}

.density-dot {
  font-size: 20px;
  font-weight: 800;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

input:disabled {
  background: #eef0f4;
  color: var(--muted);
}

textarea {
  min-height: 220px;
  resize: vertical;
  white-space: pre;
}

.result {
  margin-top: 18px;
  padding: 16px;
  border-radius: 16px;
  background: var(--result-bg);
  text-align: center;
  font-size: 22px;
  font-weight: 800;
  color: var(--primary-dark);
  word-break: break-all;
}

.error {
  min-height: 22px;
  margin-top: 10px;
  color: var(--danger);
  font-size: 14px;
  text-align: center;
}

.payroll-warning {
  margin-top: 16px;
  padding: 12px;
  border: 1px solid #f5cf75;
  border-radius: 12px;
  background: #fffbeb;
  color: #92400e;
  font-size: 14px;
  line-height: 1.6;
}

.payroll-options {
  display: grid;
  gap: 16px;
  margin-top: 20px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.payroll-options .hint {
  margin: 6px 0 0;
  line-height: 1.6;
}

.payroll-meals {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.meal-button {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 4px 8px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  background: #f8fafc;
}

.meal-button input {
  grid-row: 1 / 3;
  margin: 0;
}

.meal-button .hint {
  grid-column: 2;
  margin: 0;
  font-size: 12px;
}

.meal-button:has(input:checked) {
  border-color: var(--primary);
  background: var(--result-bg);
  color: var(--primary-dark);
}

.meal-button:focus-within {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.payroll-details {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px 16px;
  margin: 0 0 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  text-align: left;
  word-break: normal;
}

.payroll-details dt {
  color: var(--muted);
}

.payroll-details dd {
  margin: 0;
  text-align: right;
}

.payroll-total {
  font-size: 30px;
}

.payroll-amounts {
  display: flex;
  align-items: baseline;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px 12px;
  margin: 4px 0;
  word-break: normal;
}

.payroll-supplement {
  font-size: 20px;
}

#payrollMealDetails {
  margin-top: 8px;
  line-height: 1.6;
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 16px;
}

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

button.action {
  border: 0;
  border-radius: 12px;
  padding: 11px 12px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  background: #e5e7eb;
  color: var(--text);
}

button.action.primary {
  background: var(--primary);
  color: #fff;
}

button.action:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

@media (max-width: 560px) {
  body {
    padding: 12px;
  }

  header,
  .tabs,
  .panel {
    padding-left: 16px;
    padding-right: 16px;
  }

  .two-column,
  .actions,
  .actions.three {
    grid-template-columns: 1fr;
  }

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

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