* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--tt-bg, #f5f7fb);
  color: var(--tt-text, #172033);
  font-family: var(--tt-font, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif);
  line-height: 1.5;
}

.page-shell {
  width: min(100% - 32px, var(--tt-maxw, 1120px));
  margin: 0 auto;
  padding: 28px 0 48px;
}

.tool-card {
  background: var(--tt-surface, #ffffff);
  border: 1px solid var(--tt-line, #d9e1ef);
  border-radius: var(--tt-radius, 12px);
  box-shadow: var(--tt-shadow, 0 18px 50px rgba(23, 32, 51, 0.08));
  padding: clamp(20px, 4vw, 34px);
}

.tool-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--tt-gap, 20px);
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--tt-primary, #2563eb);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

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

h1 {
  margin-bottom: 8px;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  line-height: 1.1;
}

h2 {
  margin-bottom: 16px;
  font-size: 1.05rem;
}

.intro,
.content-slot,
.inline-result {
  color: var(--tt-muted, #5d6b82);
}

.secondary-button {
  border: 1px solid var(--tt-line, #d9e1ef);
  border-radius: calc(var(--tt-radius, 12px) - 4px);
  background: var(--tt-surface-soft, #fbfdff);
  color: var(--tt-text, #172033);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 10px 16px;
}

.secondary-button:hover {
  border-color: var(--tt-primary, #2563eb);
  color: var(--tt-primary-dark, #1d4ed8);
}

.summary-panel {
  display: grid;
  gap: 4px;
  padding: 18px 20px;
  margin-bottom: 16px;
  border: 1px solid var(--tt-line, #d9e1ef);
  border-radius: var(--tt-radius, 12px);
  background: var(--tt-primary-soft, #e9f1ff);
}

.summary-label {
  color: var(--tt-muted, #5d6b82);
  font-size: 0.9rem;
  font-weight: 700;
}

#mainResult {
  color: var(--tt-text, #172033);
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  font-weight: 800;
}

.error-message {
  margin-bottom: 16px;
  padding: 12px 14px;
  border: 1px solid var(--tt-danger, #b42318);
  border-radius: calc(var(--tt-radius, 12px) - 4px);
  color: var(--tt-danger, #b42318);
  background: var(--tt-surface-soft, #fbfdff);
  font-weight: 700;
}

.calculator-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--tt-gap, 20px);
}

.calc-panel {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--tt-line, #d9e1ef);
  border-radius: var(--tt-radius, 12px);
  background: var(--tt-surface-soft, #fbfdff);
}

.field-row {
  display: grid;
  gap: 14px;
}

.field-group {
  display: grid;
  gap: 6px;
}

label {
  color: var(--tt-text, #172033);
  font-weight: 700;
}

input {
  width: 100%;
  border: 1px solid var(--tt-line, #d9e1ef);
  border-radius: calc(var(--tt-radius, 12px) - 4px);
  background: var(--tt-surface, #ffffff);
  color: var(--tt-text, #172033);
  font: inherit;
  padding: 11px 12px;
}

input:focus {
  border-color: var(--tt-primary, #2563eb);
  box-shadow: 0 0 0 3px var(--tt-primary-soft, #e9f1ff);
  outline: none;
}

input[aria-invalid="true"] {
  border-color: var(--tt-danger, #b42318);
}

.inline-result {
  margin: 16px 0 0;
  font-weight: 700;
}

.inline-result output {
  color: var(--tt-success, #087443);
}

.content-slot {
  margin-top: 24px;
  padding: 18px 4px;
}

@media (max-width: 820px) {
  .tool-header {
    flex-direction: column;
  }

  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .secondary-button {
    width: 100%;
  }
}