:root {
  --color-bg: #f9fafb;
  --color-card: #ffffff;
  --color-border: #d1d5db;
  --color-muted: #6b7280;
  --color-primary: #0f766e;
  --color-primary-dark: #0d4f4a;
  --color-danger: #b91c1c;
  --color-warning: #b45309;
  --spacing-xs: 0.375rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1.5rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: #111827;
  background: var(--color-bg);
}

.app-shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--spacing-md);
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.25;
}

.header {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.header__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.help-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border-radius: 0.75rem;
  border: 1px solid var(--color-border);
  background: #ffffff;
  color: var(--color-muted);
  font-size: 0.95rem;
  font-weight: 600;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.help-button:hover,
.help-button:focus-visible {
  color: var(--color-primary-dark);
  border-color: var(--color-primary);
  background: #f8fafc;
}

.help-button[aria-expanded='true'],
.help-button[aria-expanded='true']:hover,
.help-button[aria-expanded='true']:focus-visible {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: rgba(15, 118, 110, 0.08);
}

.help-button__icon {
  font-size: 1.05rem;
  line-height: 1;
}

.help-button__text {
  line-height: 1;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

button {
  border: none;
  border-radius: 0.5rem;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

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

button.primary:hover,
button.primary:focus {
  background: var(--color-primary-dark);
}

button.secondary {
  background: #e5e7eb;
  color: #111827;
}

button.secondary:hover,
button.secondary:focus {
  background: #d1d5db;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

button:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: 3px solid rgba(15, 118, 110, 0.3);
  outline-offset: 2px;
}

.grid {
  display: grid;
  gap: var(--spacing-md);
}

@media (min-width: 960px) {
  .grid--three {
    grid-template-columns: 2fr 1.2fr 1.2fr;
  }
}

.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  padding: var(--spacing-md);
  box-shadow: 0 10px 30px rgba(15, 15, 15, 0.04);
}

.card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.card__title {
  font-size: 1.125rem;
  font-weight: 600;
}

.form-grid {
  display: grid;
  gap: var(--spacing-sm);
  align-items: start;
}

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

@media (max-width: 640px) {
  .form-grid--two {
    grid-template-columns: 1fr;
  }
}

label {
  font-weight: 600;
  display: block;
  margin-bottom: var(--spacing-xs);
}

input[type='number'],
input[type='text'],
select {
  width: 100%;
  padding: 0.65rem;
  border-radius: 0.75rem;
  border: 1px solid var(--color-border);
  font-size: 0.95rem;
  background: #ffffff;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.label-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.tooltip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: #ffffff;
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: help;
  position: relative;
}

.tooltip:hover::after,
.tooltip:focus::after {
  content: attr(data-tooltip);
  position: absolute;
  top: 110%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 200px;
  max-width: 240px;
  background: #111827;
  color: #ffffff;
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  font-size: 0.8rem;
  line-height: 1.2;
  z-index: 10;
  white-space: normal;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.25);
}

.tooltip:focus {
  outline: 3px solid rgba(15, 118, 110, 0.3);
  outline-offset: 2px;
}

.instructions {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--color-muted);
  font-size: 0.9rem;
  display: grid;
  gap: 0.35rem;
}

.field-hint {
  font-size: 0.8rem;
  color: var(--color-muted);
}

.field-error {
  font-size: 0.85rem;
  color: var(--color-danger);
  margin-top: 0.25rem;
}

.field-warning {
  font-size: 0.85rem;
  color: var(--color-warning);
  margin-top: 0.25rem;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.results-list {
  display: grid;
  gap: 0.5rem;
}

.results-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 1rem;
  font-weight: 500;
}

.results-item__value {
  font-size: 1.125rem;
  font-weight: 700;
}

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

.saved-table {
  width: 100%;
  border-collapse: collapse;
}

.saved-table th,
.saved-table td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.saved-table tbody tr:hover {
  background: #f3f4f6;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.1);
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.scenario-controls {
  display: grid;
  gap: var(--spacing-sm);
}

.scenario-controls__input {
  max-width: 240px;
}

.help-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease-out;
  z-index: 999;
}

.help-overlay[data-open='true'] {
  opacity: 1;
  pointer-events: auto;
}

.help-panel {
  position: fixed;
  top: 0;
  right: 0;
  height: 100%;
  width: min(90vw, 480px);
  background: #ffffff;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.2s ease-out;
  box-shadow: -8px 0 24px rgba(15, 23, 42, 0.18);
}

.help-panel[data-open='true'] {
  transform: translateX(0);
}

.help-panel__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 1.5rem 1rem;
  border-bottom: 1px solid var(--color-border);
  min-height: 80px;
}

.help-panel__title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.help-panel__title h2 {
  margin: 0;
  font-size: 1.2rem;
}

.help-panel__title-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(15, 118, 110, 0.1);
  color: var(--color-primary);
  font-size: 1.2rem;
}

.help-panel__close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: #f3f4f6;
  color: #111827;
  font-size: 1.3rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.help-panel__close:hover,
.help-panel__close:focus-visible {
  background: #e5e7eb;
  transform: scale(1.05);
}

.help-panel__tabs {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem 0;
  overflow-x: auto;
}

.help-panel__tab {
  border: none;
  background: transparent;
  padding: 0.5rem 0.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-muted);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.help-panel__tab.is-active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.help-panel__tab:hover,
.help-panel__tab:focus-visible {
  color: var(--color-primary);
}

.help-panel__content {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.help-panel__section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  line-height: 1.6;
}

.help-panel__section h2 {
  margin: 0;
  font-size: 1.3rem;
}

.help-panel__section p {
  margin: 0;
}

.help-panel__list {
  margin: 0;
  padding-left: 1.25rem;
  display: grid;
  gap: 0.75rem;
}

.help-panel__list > li::marker {
  font-weight: 600;
  color: var(--color-primary);
}

.help-panel__list ol {
  margin-top: 0.75rem;
  padding-left: 1.25rem;
  display: grid;
  gap: 0.5rem;
}

.help-panel__note {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.help-panel__actions {
  padding: 1rem 1.5rem 1.5rem;
  border-top: 1px solid var(--color-border);
  display: flex;
}

.help-panel__actions .secondary {
  font-weight: 600;
}

@media (prefers-reduced-motion: reduce) {
  .help-button,
  .help-button::after,
  .help-overlay,
  .help-panel,
  .help-panel__close,
  .help-panel__tab {
    transition: none;
  }
}

#print-summary {
  display: none;
}

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

  .header,
  .card__header,
  form,
  button,
  .scenario-controls,
  .saved-table tbody td:last-child {
    display: none !important;
  }

  #print-summary {
    display: block;
  }

  .card {
    border: none;
    box-shadow: none;
    padding: 0;
  }
}