/* ---------------------------------------------------
   Tokens
--------------------------------------------------- */
:root {
  --paper: #EEF0EA;
  --ink: #14181A;
  --ink-soft: #4B5450;
  --rail: #C7CCC3;
  --teal: #1F5C56;
  --brass: #A97C2F;
  --card: #F8F9F5;

  --serif: "Fraunces", Georgia, serif;
  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ---------------------------------------------------
   Header
--------------------------------------------------- */
.site-header {
  max-width: 720px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 1.5rem;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brass);
  margin: 0 0 0.75rem;
}

.site-header h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  margin: 0 0 0.6rem;
  letter-spacing: -0.01em;
}

.site-header p {
  color: var(--ink-soft);
  margin: 0;
  max-width: 46ch;
}

/* ---------------------------------------------------
   Step rail (index page)
--------------------------------------------------- */
.rail {
  max-width: 720px;
  margin: 1rem auto 4rem;
  padding: 0 1.5rem;
  list-style: none;
}

.rail li {
  position: relative;
  padding-left: 3.25rem;
  border-left: 1px solid var(--rail);
  padding-bottom: 2.1rem;
}

.rail li:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.rail .tick {
  position: absolute;
  left: -0.5px;
  top: 0.15rem;
  width: 1rem;
  height: 1px;
  background: var(--rail);
}

.step-link {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  text-decoration: none;
  padding: 0.6rem 0.9rem;
  margin-left: -0.9rem;
  border-radius: 6px;
  transition: background 0.15s ease, transform 0.15s ease;
}

.step-link:hover,
.step-link:focus-visible {
  background: var(--card);
  transform: translateX(2px);
}

.step-num {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--brass);
  min-width: 1.6rem;
}

.step-title {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 500;
}

.step-arrow {
  margin-left: auto;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.9rem;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.step-link:hover .step-arrow,
.step-link:focus-visible .step-arrow {
  opacity: 1;
}

/* ---------------------------------------------------
   Footer
--------------------------------------------------- */
.site-footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
}

/* ---------------------------------------------------
   Step detail page
--------------------------------------------------- */
.step-page {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  text-decoration: none;
  color: var(--ink-soft);
  margin-bottom: 1.5rem;
}

.back-link:hover { color: var(--teal); }

.step-page header {
  margin-bottom: 1.5rem;
}

.step-page .eyebrow { margin-bottom: 0.4rem; }

.step-page h1 {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 4.5vw, 2.2rem);
  margin: 0;
}

.step-page h2 {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 500;
  margin: 2rem 0 0.5rem;
}

.note-heading {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--brass);
  margin: 1.5rem 0 0.25rem;
}

.infographic {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--rail);
  display: block;
  background: var(--card);
}

.step-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 2rem;
  font-family: var(--mono);
  font-size: 0.85rem;
}

.step-nav a,
.step-nav .disabled {
  text-decoration: none;
  padding: 0.6rem 1rem;
  border: 1px solid var(--rail);
  border-radius: 6px;
}

.step-nav a:hover {
  border-color: var(--teal);
  color: var(--teal);
}

.step-nav .disabled {
  visibility: hidden;
}