:root {
  --color-rice-paper: #F7F3E9;
  --color-ink-navy: #1C2A3A;
  --color-jade-green: #3A6B5C;
  --color-burnt-crimson: #9E3B2F;
  --color-muted-ochre: #B38B4A;
  --color-bronze: #8C6A3F;
  --color-smoke-grey: #E8E4DA;
  --color-dark-charcoal: #2B2B2B;
  --color-parchment-light: #F0EBE0;
  --color-ink-navy-muted: #4A5A6A;

  --font-heading: 'Noto Serif SC', 'Source Han Serif', Georgia, serif;
  --font-body: 'Noto Sans SC', 'Source Han Sans', system-ui, sans-serif;

  --text-display-size: clamp(2.5rem, 5vw, 3.5rem);
  --text-display-line-height: 1.1;
  --text-display-weight: 700;
  --text-h1-size: clamp(2rem, 3.5vw, 2.5rem);
  --text-h1-line-height: 1.2;
  --text-h1-weight: 700;
  --text-h2-size: clamp(1.75rem, 2.5vw, 2rem);
  --text-h2-line-height: 1.25;
  --text-h2-weight: 600;
  --text-h3-size: clamp(1.375rem, 2vw, 1.5rem);
  --text-h3-line-height: 1.3;
  --text-h3-weight: 600;
  --text-h4-size: 1.25rem;
  --text-h4-line-height: 1.4;
  --text-h4-weight: 600;
  --text-body-large-size: 1.125rem;
  --text-body-large-line-height: 1.6;
  --text-body-large-weight: 400;
  --text-body-size: 1rem;
  --text-body-line-height: 1.6;
  --text-body-weight: 400;
  --text-small-size: 0.875rem;
  --text-small-line-height: 1.5;
  --text-small-weight: 400;
  --text-caption-size: 0.75rem;
  --text-caption-line-height: 1.4;
  --text-caption-weight: 400;
  --text-overline-size: 0.75rem;
  --text-overline-line-height: 1.4;
  --text-overline-weight: 600;
  --text-overline-letter-spacing: 0.08em;

  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  --container-standard: 1200px;
  --container-article: 800px;
  --container-padding-mobile: 1.5rem;
  --container-padding-tablet: 2rem;
  --container-padding-desktop: 3rem;

  --surface-primary: var(--color-rice-paper);
  --surface-secondary: var(--color-smoke-grey);
  --surface-dark: var(--color-dark-charcoal);
  --surface-alternate: var(--color-parchment-light);

  --border-default: 1px solid rgba(28, 42, 58, 0.2);
  --border-emphasis: 2px solid var(--color-ink-navy);
  --border-accent-jade: 4px solid var(--color-jade-green);
  --border-accent-crimson: 4px solid var(--color-burnt-crimson);
  --border-accent-ochre: 4px solid var(--color-muted-ochre);
  --border-accent-bronze: 4px solid var(--color-bronze);

  --shadow-card: 0 2px 8px rgba(28, 42, 58, 0.08);

  --radius-default: 4px;
  --radius-large: 8px;
  --radius-pill: 999px;

  --transition-fast: 150ms ease-in-out;

  --focus-outline: 2px solid var(--color-jade-green);
  --focus-offset: 2px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: var(--text-body-size);
  font-weight: var(--text-body-weight);
  line-height: var(--text-body-line-height);
  color: var(--color-ink-navy);
  background-color: var(--surface-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  color: var(--color-ink-navy);
  overflow-wrap: break-word;
  word-wrap: break-word;
}

h1 {
  font-size: var(--text-h1-size);
  line-height: var(--text-h1-line-height);
  font-weight: var(--text-h1-weight);
  margin-block-end: var(--space-lg);
}

h2 {
  font-size: var(--text-h2-size);
  line-height: var(--text-h2-line-height);
  font-weight: var(--text-h2-weight);
  margin-block-end: var(--space-md);
}

h3 {
  font-size: var(--text-h3-size);
  line-height: var(--text-h3-line-height);
  font-weight: var(--text-h3-weight);
  margin-block-end: var(--space-md);
}

h4 {
  font-size: var(--text-h4-size);
  line-height: var(--text-h4-line-height);
  font-weight: var(--text-h4-weight);
  margin-block-end: var(--space-sm);
}

h5,
h6 {
  font-family: var(--font-heading);
  color: var(--color-ink-navy);
  margin-block-end: var(--space-sm);
}

p {
  font-size: var(--text-body-size);
  line-height: var(--text-body-line-height);
  font-weight: var(--text-body-weight);
  color: var(--color-ink-navy);
  margin-block-end: var(--space-md);
}

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

a {
  color: var(--color-ink-navy);
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

a:hover {
  text-decoration: underline;
}

a:visited {
  color: var(--color-muted-ochre);
}

a:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-default);
}

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

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

blockquote {
  margin-block-end: var(--space-md);
  padding: var(--space-md);
  background-color: var(--surface-alternate);
  border-inline-start: var(--border-accent-bronze);
  font-style: italic;
}

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

blockquote p {
  margin-block-end: 0;
}

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

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

figcaption {
  font-size: var(--text-caption-size);
  line-height: var(--text-caption-line-height);
  color: var(--color-ink-navy-muted);
  margin-block-start: var(--space-xs);
}

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

img {
  border-radius: var(--radius-default);
}

hr {
  border: none;
  border-block-start: var(--border-default);
  margin-block: var(--space-xl);
}

code,
pre,
kbd,
samp {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.9em;
}

pre {
  background-color: var(--surface-secondary);
  padding: var(--space-md);
  border-radius: var(--radius-default);
  overflow-x: auto;
  margin-block-end: var(--space-md);
}

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

code {
  background-color: var(--surface-secondary);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-default);
}

pre code {
  background-color: transparent;
  padding: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-block-end: var(--space-md);
  font-size: var(--text-small-size);
  line-height: var(--text-small-line-height);
}

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

th,
td {
  padding: var(--space-sm) var(--space-md);
  text-align: start;
  border: var(--border-default);
}

th {
  background-color: var(--surface-secondary);
  font-weight: 600;
  color: var(--color-ink-navy);
}

tbody tr:nth-child(even) {
  background-color: var(--surface-secondary);
}

caption {
  font-size: var(--text-caption-size);
  line-height: var(--text-caption-line-height);
  color: var(--color-ink-navy-muted);
  margin-block-end: var(--space-xs);
  text-align: start;
}

form {
  margin-block-end: var(--space-md);
}

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

fieldset {
  border: var(--border-default);
  border-radius: var(--radius-default);
  padding: var(--space-md);
  margin-block-end: var(--space-md);
}

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

legend {
  font-family: var(--font-heading);
  font-weight: 600;
  padding-inline: var(--space-xs);
  color: var(--color-ink-navy);
}

label {
  display: block;
  font-size: var(--text-small-size);
  line-height: var(--text-small-line-height);
  font-weight: 600;
  color: var(--color-ink-navy);
  margin-block-end: var(--space-xs);
}

input,
select,
textarea,
button {
  font-family: var(--font-body);
  font-size: var(--text-body-size);
  line-height: var(--text-body-line-height);
  color: var(--color-ink-navy);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="url"],
input[type="number"],
input[type="date"],
input[type="time"],
input[type="datetime-local"],
input[type="month"],
input[type="week"],
select,
textarea {
  width: 100%;
  background-color: var(--surface-primary);
  border: 1px solid var(--color-ink-navy);
  border-radius: var(--radius-default);
  padding: var(--space-sm) var(--space-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 44px;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="search"]:focus,
input[type="tel"]:focus,
input[type="url"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
input[type="time"]:focus,
input[type="datetime-local"]:focus,
input[type="month"]:focus,
input[type="week"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-jade-green);
  box-shadow: 0 0 0 2px rgba(58, 107, 92, 0.2);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

select {
  appearance: auto;
  -webkit-appearance: auto;
  -moz-appearance: auto;
}

input[type="checkbox"],
input[type="radio"] {
  width: auto;
  min-height: auto;
  margin-inline-end: var(--space-xs);
}

input[type="checkbox"]:focus-visible,
input[type="radio"]:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

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

button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  background-color: var(--color-jade-green);
  color: var(--surface-primary);
  border: none;
  border-radius: var(--radius-default);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--text-overline-size);
  line-height: var(--text-overline-line-height);
  font-weight: var(--text-overline-weight);
  letter-spacing: var(--text-overline-letter-spacing);
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  min-height: 44px;
}

button:hover {
  background-color: #2E5A4C;
}

button:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

button:disabled,
button[aria-disabled="true"] {
  background-color: var(--color-ink-navy-muted);
  cursor: not-allowed;
  opacity: 0.6;
}

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

.container--article {
  max-width: var(--container-article);
}

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

.surface-dark {
  background-color: var(--surface-dark);
  color: var(--surface-primary);
}

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

.card {
  background-color: var(--surface-secondary);
  border: var(--border-default);
  border-radius: var(--radius-default);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
}

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

.panel {
  background-color: var(--surface-secondary);
  border: var(--border-default);
  border-radius: var(--radius-large);
  padding: var(--space-xl);
}

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

.callout {
  background-color: var(--surface-alternate);
  border-inline-start: var(--border-accent-bronze);
  padding: var(--space-md);
  border-radius: 0 var(--radius-default) var(--radius-default) 0;
}

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

.callout--jade {
  border-inline-start-color: var(--color-jade-green);
}

.callout--crimson {
  border-inline-start-color: var(--color-burnt-crimson);
}

.callout--ochre {
  border-inline-start-color: var(--color-muted-ochre);
}

.tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xs) var(--space-sm);
  border-radius: var(--radius-pill);
  font-size: var(--text-caption-size);
  line-height: var(--text-caption-line-height);
  font-weight: 600;
  letter-spacing: 0.02em;
  background-color: rgba(58, 107, 92, 0.15);
  color: var(--color-jade-green);
  white-space: nowrap;
}

.tag--jade {
  background-color: rgba(58, 107, 92, 0.15);
  color: var(--color-jade-green);
}

.tag--crimson {
  background-color: rgba(158, 59, 47, 0.15);
  color: var(--color-burnt-crimson);
}

.tag--ochre {
  background-color: rgba(179, 139, 74, 0.15);
  color: var(--color-muted-ochre);
}

.tag--bronze {
  background-color: rgba(140, 106, 63, 0.15);
  color: var(--color-bronze);
}

.tag--neutral {
  background-color: rgba(28, 42, 58, 0.1);
  color: var(--color-ink-navy);
}

.overline {
  font-size: var(--text-overline-size);
  line-height: var(--text-overline-line-height);
  font-weight: var(--text-overline-weight);
  letter-spacing: var(--text-overline-letter-spacing);
  text-transform: uppercase;
  color: var(--color-ink-navy-muted);
}

.display {
  font-family: var(--font-heading);
  font-size: var(--text-display-size);
  line-height: var(--text-display-line-height);
  font-weight: var(--text-display-weight);
  color: var(--color-ink-navy);
  margin-block-end: var(--space-lg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  background-color: var(--color-jade-green);
  color: var(--surface-primary);
  border: none;
  border-radius: var(--radius-default);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--text-overline-size);
  line-height: var(--text-overline-line-height);
  font-weight: var(--text-overline-weight);
  letter-spacing: var(--text-overline-letter-spacing);
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  min-height: 44px;
  text-decoration: none;
}

.btn:hover {
  background-color: #2E5A4C;
  text-decoration: none;
}

.btn:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-ink-navy);
  border: 1px solid var(--color-ink-navy);
}

.btn--secondary:hover {
  background-color: var(--surface-alternate);
  border-color: var(--color-ink-navy);
}

.btn--dark {
  background-color: var(--color-dark-charcoal);
  color: var(--surface-primary);
}

.btn--dark:hover {
  background-color: #3A3A3A;
}

.btn--crimson {
  background-color: var(--color-burnt-crimson);
  color: var(--surface-primary);
}

.btn--crimson:hover {
  background-color: #7E2E24;
}

.btn--ochre {
  background-color: var(--color-muted-ochre);
  color: var(--surface-primary);
}

.btn--ochre:hover {
  background-color: #96712E;
}

.btn--bronze {
  background-color: var(--color-bronze);
  color: var(--surface-primary);
}

.btn--bronze:hover {
  background-color: #6E542F;
}

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

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

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

.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--justify-around {
  justify-content: space-around;
}

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

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

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

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

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

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

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

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

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

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: 1000;
  background-color: var(--color-ink-navy);
  color: var(--surface-primary);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-default);
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-md);
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
  text-decoration: none;
}

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

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

@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;
  }
}