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

html {
  background: var(--ink);
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1.5rem);
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(243, 239, 228, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(243, 239, 228, 0.035) 1px, transparent 1px);
  background-size: 34px 34px;
  color: var(--ivory);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  z-index: 50;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.08) 0 0.5px, transparent 0.8px),
    radial-gradient(circle at 70% 60%, rgba(0, 0, 0, 0.22) 0 0.6px, transparent 0.9px);
  background-size: 5px 7px, 7px 5px;
  content: "";
  opacity: 0.17;
  pointer-events: none;
}

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

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

button,
select {
  min-height: 44px;
}

a {
  color: inherit;
}

button:focus-visible,
select:focus-visible,
a:focus-visible,
[tabindex]:focus-visible {
  border-radius: var(--radius-small);
  outline: none;
  box-shadow: var(--focus);
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  border: 0 !important;
  margin: -1px !important;
  clip: rect(0, 0, 0, 0) !important;
  clip-path: inset(50%) !important;
  overflow: hidden !important;
  white-space: nowrap !important;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 0.8rem;
  left: 0.8rem;
  padding: 0.8rem 1rem;
  background: var(--acid);
  color: var(--ink-deep);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 160ms ease;
}

.skip-link--notebook { left: 12rem; }
.skip-link:focus { transform: translateY(0); }

.hosted-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  padding: 0.62rem var(--page-gutter);
  background: var(--acid);
  color: var(--ink-deep);
  font-size: 0.78rem;
  line-height: 1.35;
  text-align: center;
}

.hosted-preview[hidden] { display: none; }
.hosted-preview strong {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
}

.micro-label,
.eyebrow {
  margin: 0;
  color: var(--acid);
  font-family: var(--font-mono);
  font-size: clamp(0.64rem, 0.8vw, 0.76rem);
  font-weight: 800;
  letter-spacing: 0.14em;
  line-height: 1.35;
  text-transform: uppercase;
}

.icon-button {
  display: inline-flex;
  min-width: 44px;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.62rem 0.85rem;
  border: 1px solid var(--line);
  background: var(--ink-raised);
  color: var(--ivory);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.04em;
}

.icon-button:hover { border-color: var(--acid); }
.icon-button--accent { background: var(--acid); color: var(--ink-deep); }

.control-room {
  position: sticky;
  z-index: 40;
  top: 0;
  display: grid;
  min-height: var(--header-height);
  grid-template-columns: minmax(230px, 0.78fr) minmax(450px, 1.7fr) minmax(290px, 1fr);
  grid-template-rows: auto auto;
  align-items: center;
  gap: 0.65rem 1.4rem;
  padding: 0.8rem var(--page-gutter) 0.72rem;
  border-bottom: 1px solid var(--line-strong);
  background: rgba(23, 26, 23, 0.97);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.28);
}

.control-room__identity {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 0.8rem;
}

.mark {
  display: grid;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--line-strong);
  color: var(--acid);
}

.journey-name {
  margin: 0.2rem 0 0;
  overflow: hidden;
  font-size: 0.93rem;
  font-weight: 760;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.stage-nav { min-width: 0; }
.stage-nav ol {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  padding: 0;
  margin: 0;
  list-style: none;
}

.stage-nav li { min-width: 0; }
.stage-nav a {
  position: relative;
  display: flex;
  min-height: 44px;
  align-items: center;
  gap: 0.35rem;
  padding: 0.7rem 0.6rem 0.7rem 1.15rem;
  border-top: 2px solid var(--line);
  color: var(--fog);
  font-family: var(--font-mono);
  font-size: clamp(0.59rem, 0.75vw, 0.72rem);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.stage-nav a::before {
  position: absolute;
  top: -5px;
  left: 0;
  width: 8px;
  height: 8px;
  border: 1px solid var(--fog);
  background: var(--ink);
  content: "";
  transform: rotate(45deg);
}

.stage-nav a[aria-current="step"] {
  border-color: var(--acid);
  color: var(--ivory);
}

.stage-nav a[aria-current="step"]::before {
  border-color: var(--acid);
  background: var(--acid);
  box-shadow: 0 0 0 4px rgba(216, 237, 116, 0.12);
}

.stage-nav__number { color: var(--acid); }

.session-meter {
  grid-column: 1 / 3;
  min-width: 0;
}

.session-meter__readout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.35rem;
  color: var(--ivory-dim);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.progress-track { height: 3px; background: var(--line); overflow: hidden; }
.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--acid);
  transition: width 120ms linear;
}

.control-room__actions {
  grid-column: 3;
  grid-row: 1 / 3;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
}

.chapter-jump {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 0.15rem;
  color: var(--fog);
  font-family: var(--font-mono);
  font-size: 0.61rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.chapter-jump select {
  width: min(14rem, 18vw);
  padding: 0 2rem 0 0.65rem;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--ink-raised);
  color: var(--ivory);
  cursor: pointer;
  font-size: 0.74rem;
}

noscript {
  display: block;
  padding: 2rem var(--page-gutter);
  border-top: 2px solid var(--rust);
  background: var(--ink-deep);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }
}