:root {
  --phi: 1.61803398875;
  --phi-inv: 0.61803398875;
  --phi-sq: 2.61803398875;
  font-size: 14px;
  line-height: var(--phi);
}

@media (min-width: 618px) {
  :root { font-size: 16px; }
}
@media (min-width: 1000px) {
  :root { font-size: 19.42px; }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, Helvetica, Arial, sans-serif;
  background-color: #111;
  color: #f3ece2;
  margin: 0;
  padding: calc(1rem * var(--phi));
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100svh;
  box-sizing: border-box;
}

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

.content-wrapper {
  width: 100%;
  max-width: calc(100px * var(--phi) * var(--phi) * var(--phi) * var(--phi));
  padding-top: 9.017vh;
}

.nav-menu {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: calc(1rem * var(--phi));
  text-align: center;
}

h1 {
  margin: 0;
  font-weight: bold;
  font-size: calc(1rem * var(--phi-sq)); 
  color: #111;
  line-height: var(--phi);
}

p {
  font-size: calc(1rem * var(--phi));
  line-height: var(--phi);
  margin: 0;
  max-width: 38.2rem;
  opacity: var(--phi-inv);
}

a {
  color: #1e90ff;
  text-transform: uppercase;
  font-size: calc(1rem * var(--phi-inv));
  letter-spacing: calc(0.1rem * var(--phi));
  text-decoration: underline;
}

a:active {
  opacity: var(--phi-inv);
}

.download-sub {
  display: inline-block;
  text-decoration: none;
  color: #ff7c1e;
  font-size: 1rem;
  text-transform: uppercase;
  border: 1px solid rgba(255, 124, 30, 0.382);
  border-radius: calc(1px * var(--phi) * var(--phi));
  padding: calc(0.5rem * var(--phi-inv)) calc(0.5rem * var(--phi));
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1618), 0 1px calc(1px * var(--phi)) rgba(0, 0, 0, 0.382);
  transition: all calc(0.1s * var(--phi-sq)) ease;
}

.download-sub:hover {
  text-decoration: none;
  border-color: rgba(255, 124, 30, var(--phi-inv));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2618), 0 0 calc(1px * var(--phi) * var(--phi) * var(--phi) * var(--phi)) rgba(255, 124, 30, 0.1618);
}