:root {
  --puls-ink: #0f1319;
  --puls-paper: #f5f5f3;
  --puls-white: #ffffff;
  --puls-steel: #586674;
  --puls-blue: #255198;
  --puls-blue-dark: #183a70;
  --puls-blue-soft: #a9c7f5;
  --puls-line: rgba(15, 19, 25, 0.18);
  --puls-line-light: rgba(245, 245, 243, 0.24);
  --puls-muted: #56606d;

  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "Fira Code", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell: 80rem;
  --header-block: clamp(4.25rem, 4.8vw, 5.125rem);
  --header-height: var(--header-block);
  --action-block: 0rem;
  --viewport-block: 100svb;
  --usable-block: calc(var(--viewport-block) - var(--header-block) - var(--action-block));
  --chapter-block: var(--usable-block);
  --gutter: clamp(1rem, 4vw, 4rem);
  --chapter-padding: clamp(2rem, 5.7svb, 4.5rem);
  --layout-gap: clamp(1.25rem, 3vw, 3rem);
  --line: 1px;

  color-scheme: dark;
  font-family: var(--font-sans);
  color: var(--puls-ink);
  background: var(--puls-paper);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

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

html {
  overflow-x: clip;
  scroll-behavior: auto;
  scroll-padding-block-start: var(--header-block);
  scroll-padding-block-end: var(--action-block);
}

body {
  min-inline-size: 20rem;
  margin: 0;
  overflow-x: clip;
  background: var(--puls-paper);
  color: var(--puls-ink);
  font-size: clamp(0.9375rem, 0.9rem + 0.15vw, 1.0625rem);
  line-height: 1.55;
}

body.menu-open {
  overflow: hidden;
}

img,
svg {
  display: block;
  max-inline-size: 100%;
}

img {
  block-size: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
select,
summary,
a {
  -webkit-tap-highlight-color: transparent;
}

button,
select,
summary {
  cursor: pointer;
}

button {
  border: 0;
}

fieldset {
  min-inline-size: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

legend,
h1,
h2,
h3,
p,
ol,
ul {
  margin: 0;
}

h1,
h2,
h3 {
  font-weight: 700;
  letter-spacing: -0.04em;
}

::selection {
  background: var(--puls-blue);
  color: var(--puls-white);
}

:focus-visible {
  outline: 0.1875rem solid var(--puls-blue-soft);
  outline-offset: 0.25rem;
}

[hidden] {
  display: none !important;
}

.shell {
  inline-size: 100%;
  max-inline-size: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  container-type: inline-size;
}

.sr-only,
.honeypot {
  position: absolute;
  inline-size: 0.0625rem;
  block-size: 0.0625rem;
  padding: 0;
  margin: -0.0625rem;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 100;
  inset-block-start: 0.75rem;
  inset-inline-start: 0.75rem;
  transform: translateY(-160%);
  padding: 0.625rem 0.875rem;
  background: var(--puls-white);
  color: var(--puls-ink);
  font-weight: 700;
}

.skip-link:focus {
  transform: translateY(0);
}

.button {
  display: inline-flex;
  min-block-size: 2.75rem;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.75rem 1.125rem;
  border: var(--line) solid transparent;
  border-radius: 0;
  font-size: clamp(0.8125rem, 0.78rem + 0.1vw, 0.9375rem);
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.button:hover {
  transform: translateY(-0.125rem);
}

.button--small {
  min-block-size: 2.75rem;
  padding-inline: 0.875rem;
  font-size: 0.8125rem;
}

.button--blue {
  background: var(--puls-blue);
  color: var(--puls-white);
}

.button--blue:hover {
  background: var(--puls-blue-dark);
}

.button--line-light {
  border-color: rgba(255, 255, 255, 0.55);
  color: var(--puls-white);
}

.button--line-light:hover {
  border-color: var(--puls-white);
  background: rgba(255, 255, 255, 0.1);
}

.button--light {
  background: var(--puls-white);
  color: var(--puls-ink);
}

.button--light:hover {
  background: var(--puls-blue-soft);
}

.button--dark {
  background: var(--puls-ink);
  color: var(--puls-white);
}

.button--dark:hover {
  background: var(--puls-blue-dark);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

@media (max-width: 48rem) {
  :root {
    --action-block: calc(3.25rem + env(safe-area-inset-bottom));
    --chapter-padding: clamp(1.75rem, 6svb, 3.25rem);
  }

  body {
    padding-block-end: var(--action-block);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}