:root {
  --color-paper: #F4F0E8;
  --color-paper-deep: #EAE4D9;
  --color-ink: #252B30;
  --color-ink-soft: #5A6168;
  --color-slate: #42677E;
  --color-brick: #BC665B;
  --color-sage: #71847A;
  --color-brass: #BE9857;
  --font-heading: "Fraunces", Georgia, serif;
  --font-body: "Inter", system-ui, sans-serif;
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;
  --radius-none: 0;
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --shadow-elevated: 0 1px 2px rgba(37, 43, 48, 0.08), 0 2px 8px rgba(37, 43, 48, 0.06);
  --container-main: 72rem;
  --container-wide: 84rem;
  --measure-prose: 42rem;
  --gutter-mobile: 1rem;
  --gutter-tablet: 1.5rem;
  --gutter-desktop: 2.5rem;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-ink);
  background-color: var(--color-paper);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.2;
  overflow-wrap: break-word;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-block-end: var(--space-lg);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 1.875rem);
  margin-block-end: var(--space-md);
}

h3 {
  font-size: 1.375rem;
  line-height: 1.3;
  margin-block-end: var(--space-sm);
}

h4 {
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.35;
  margin-block-end: var(--space-sm);
}

h5 {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.35;
  margin-block-end: var(--space-xs);
}

h6 {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.35;
  margin-block-end: var(--space-xs);
}

p {
  margin: 0;
  margin-block-end: var(--space-md);
  line-height: 1.65;
}

p:last-child {
  margin-block-end: 0;
}

ul,
ol {
  margin: 0;
  padding-inline-start: 1.25rem;
  margin-block-end: var(--space-md);
}

ul:last-child,
ol:last-child {
  margin-block-end: 0;
}

li {
  margin: 0;
}

.content-list > li + li,
article ul:not([class]) > li + li,
article ol:not([class]) > blockquote {
  margin: 0;
  margin-block-end: var(--space-md);
  padding-inline-start: var(--space-md);
  border-inline-start: 2px solid var(--color-brass);
  color: var(--color-ink-soft);
  font-style: italic;
}

blockquote:last-child {
  margin-block-end: 0;
}

figure {
  margin: 0;
  margin-block-end: var(--space-lg);
}

figure:last-child {
  margin-block-end: 0;
}

figcaption {
  font-size: 0.75rem;
  line-height: 1.4;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  margin-block-start: var(--space-xs);
  padding-block-start: var(--space-xs);
  border-block-start: 1px solid var(--color-brass);
}

a {
  color: var(--color-slate);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  transition: color 150ms ease-out;
}

a:hover {
  color: var(--color-ink);
}

a:focus-visible {
  outline: 2px solid var(--color-slate);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

img,
picture,
svg,
video,
canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

img {
  border: 1px solid var(--color-ink-soft);
  border-radius: var(--radius-none);
}

input,
textarea,
select,
button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
}

input,
textarea,
select {
  margin: 0;
  padding: var(--space-xs) var(--space-sm);
  background-color: var(--color-paper);
  border: 1px solid var(--color-ink-soft);
  border-radius: var(--radius-md);
  transition: border-color 150ms ease-out;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--color-slate);
  outline: 2px solid var(--color-slate);
  outline-offset: 2px;
}

input::placeholder,
textarea::placeholder {
  color: var(--color-ink-soft);
}

textarea {
  resize: vertical;
  min-height: 6rem;
}

button {
  margin: 0;
  padding: var(--space-xs) var(--space-md);
  background-color: var(--color-paper);
  border: 1px solid var(--color-ink-soft);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 150ms ease-out, border-color 150ms ease-out, color 150ms ease-out;
}

button:hover {
  background-color: var(--color-paper-deep);
  border-color: var(--color-slate);
}

button:focus-visible {
  outline: 2px solid var(--color-slate);
  outline-offset: 2px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-block-end: var(--space-md);
}

table:last-child {
  margin-block-end: 0;
}

th,
td {
  padding: var(--space-xs) var(--space-sm);
  text-align: start;
  border-block-end: 1px solid var(--color-ink-soft);
}

th {
  background-color: var(--color-paper-deep);
  font-weight: 600;
}

hr {
  margin: 0;
  margin-block-end: var(--space-lg);
  border: none;
  border-block-start: 1px solid var(--color-ink-soft);
}

hr:last-child {
  margin-block-end: 0;
}

.container {
  width: 100%;
  max-width: var(--container-main);
  margin-inline: auto;
  padding-inline: var(--gutter-mobile);
}

.container-wide {
  width: 100%;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--gutter-mobile);
}

.section {
  margin-block-end: var(--space-2xl);
}

.section:last-child {
  margin-block-end: 0;
}

.surface-paper-deep {
  background-color: var(--color-paper-deep);
}

.card {
  background-color: var(--color-paper);
  border: 1px solid var(--color-ink-soft);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: border-color 150ms ease-out, box-shadow 150ms ease-out;
}

.card:hover {
  border-color: var(--color-slate);
  box-shadow: var(--shadow-elevated);
}

.card > :last-child {
  margin-block-end: 0;
}

.callout {
  background-color: var(--color-paper-deep);
  border-inline-start: 3px solid var(--color-brass);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.callout > :last-child {
  margin-block-end: 0;
}

.spoiler-gate {
  background-color: var(--color-brick);
  color: var(--color-paper);
  border: none;
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  font-weight: 600;
}

.spoiler-gate:hover {
  background-color: var(--color-brick);
  color: var(--color-paper);
}

.spoiler-content {
  border-inline-start: 3px solid var(--color-brick);
  padding-inline-start: var(--space-md);
  margin-block-start: var(--space-md);
}

.spoiler-content > :last-child {
  margin-block-end: 0;
}

.chapter-marker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.75rem;
  line-height: 1.4;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-slate);
}

.chapter-marker__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background-color: var(--color-brass);
  color: var(--color-paper);
  font-weight: 600;
  flex-shrink: 0;
}

.diagram-label {
  font-size: 0.8125rem;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}

.small {
  font-size: 0.875rem;
  line-height: 1.5;
}

.caption {
  font-size: 0.75rem;
  line-height: 1.4;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}

.body-large {
  font-size: 1.125rem;
  line-height: 1.65;
}

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

.flex {
  display: flex;
  gap: var(--space-md);
  min-width: 0;
}

.flex > * {
  min-width: 0;
  flex-shrink: 1;
}

.flex-wrap {
  flex-wrap: wrap;
}

.flex-nowrap {
  flex-wrap: nowrap;
}

.flex-column {
  flex-direction: column;
}

.flex-align-center {
  align-items: center;
}

.flex-align-start {
  align-items: flex-start;
}

.flex-align-end {
  align-items: flex-end;
}

.flex-justify-start {
  justify-content: flex-start;
}

.flex-justify-center {
  justify-content: center;
}

.flex-justify-end {
  justify-content: flex-end;
}

.flex-justify-between {
  justify-content: space-between;
}

.flex-gap-xs {
  gap: var(--space-xs);
}

.flex-gap-sm {
  gap: var(--space-sm);
}

.flex-gap-md {
  gap: var(--space-md);
}

.flex-gap-lg {
  gap: var(--space-lg);
}

.flex-gap-xl {
  gap: var(--space-xl);
}

.flex-gap-2xl {
  gap: var(--space-2xl);
}

.flex-gap-none {
  gap: 0;
}

.flex-grow {
  flex-grow: 1;
}

.flex-shrink-none {
  flex-shrink: 0;
}

.flex-basis-auto {
  flex-basis: auto;
}

.flex-basis-0 {
  flex-basis: 0;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  min-width: 0;
}

.stack > * {
  min-width: 0;
  flex-shrink: 1;
}

.stack-gap-xs {
  gap: var(--space-xs);
}

.stack-gap-sm {
  gap: var(--space-sm);
}

.stack-gap-md {
  gap: var(--space-md);
}

.stack-gap-lg {
  gap: var(--space-lg);
}

.stack-gap-xl {
  gap: var(--space-xl);
}

.stack-gap-2xl {
  gap: var(--space-2xl);
}

.stack-gap-none {
  gap: 0;
}

.flow > * + * {
  margin-block-start: var(--space-md);
}

.flow-sm > * + * {
  margin-block-start: var(--space-sm);
}

.flow-lg > * + * {
  margin-block-start: var(--space-lg);
}

.flow-xl > * + * {
  margin-block-start: var(--space-xl);
}

.flow-none > * + * {
  margin-block-start: 0;
}

@media (min-width: 768px) {
  .container,
  .container-wide {
    padding-inline: var(--gutter-tablet);
  }

  .section {
    margin-block-end: var(--space-3xl);
  }

  .section:last-child {
    margin-block-end: 0;
  }
}

@media (min-width: 1024px) {
  .container,
  .container-wide {
    padding-inline: var(--gutter-desktop);
  }

  .section {
    margin-block-end: var(--space-3xl);
  }

  .section:last-child {
    margin-block-end: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}