* {
  box-sizing: border-box;
}

html {
  color-scheme: light dark;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--tg-text);
  background: var(--tg-bg);
}

a {
  color: var(--tg-accent-text);
}

.shell {
  width: min(100% - 32px, 68rem);
  margin-inline: auto;
}

.site-header {
  padding-block: 24px;
  border-bottom: 1px solid var(--tg-border);
}

.brand-logo {
  display: block;
  width: 200px;
  max-width: 100%;
  height: auto;
}

.brand-logo > text {
  fill: var(--tg-text);
}

main {
  padding-block: 64px 80px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--tg-accent-text);
  font-size: 0.9375rem;
  font-weight: 600;
}

h1 {
  max-width: 13ch;
  margin: 0;
  font-size: 2.25rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.lead {
  max-width: var(--tg-measure);
  margin: 20px 0 0;
  color: var(--tg-text-muted);
}

.catalogue {
  margin-top: 56px;
}

h2 {
  margin: 0 0 20px;
  font-size: 1.375rem;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.calculator-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.calculator-card {
  display: block;
  height: 100%;
  padding: 24px;
  border: 1px solid var(--tg-border);
  border-radius: 16px;
  background: var(--tg-surface);
}

.calculator-card-link {
  color: var(--tg-text);
  text-decoration: none;
}

.calculator-card-link:hover h3 {
  text-decoration: underline;
  text-decoration-color: var(--tg-accent-text);
}

.calculator-card-link:focus-visible {
  outline: 3px solid var(--tg-accent-text);
  outline-offset: 3px;
}

.card-number {
  display: block;
  margin-bottom: 28px;
  color: var(--tg-text-muted);
  font-family: var(--tg-font-mono);
  font-size: 0.8125rem;
}

.calculator-card h3 {
  margin: 0;
  font-size: 1.125rem;
  line-height: 1.35;
  font-weight: 600;
}

.status {
  display: inline-block;
  margin-top: 14px;
  padding: 4px 10px;
  border-radius: 999px;
  color: var(--tg-on-accent);
  background: var(--tg-accent);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.site-footer {
  padding-block: 24px;
  border-top: 1px solid var(--tg-border);
  color: var(--tg-text-muted);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 700px) {
  main {
    padding-block: 48px 64px;
  }

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

  .card-number {
    margin-bottom: 16px;
  }
}

@media (min-width: 768px) {
  h1 {
    font-size: 3rem;
  }
}