/*
 * Temperfield Group component styles
 *
 * D.3 — Buttons and Links
 * Later Phase D component sections will extend this file.
 */

:root {
  --button-min-block-size: var(--size-touch-target);
  --button-padding-block: var(--space-3);
  --button-padding-inline: var(--space-5);
  --button-gap: var(--space-2);
  --button-border-width: var(--border-width-strong);
  --button-radius: var(--radius-small);
  --link-underline-offset: 0.2em;
  --link-underline-thickness: max(var(--border-width-thin), 0.08em);
}

a:not([class]),
.text-link {
  color: var(--color-link);
  text-decoration-color: currentColor;
  text-decoration-line: underline;
  text-decoration-skip-ink: auto;
  text-decoration-thickness: var(--link-underline-thickness);
  text-underline-offset: var(--link-underline-offset);
  transition-duration: var(--duration-fast);
  transition-property: color, text-decoration-color;
  transition-timing-function: var(--easing-standard);
}

a:not([class]):visited,
.text-link:visited {
  color: var(--color-link-visited);
}

.text-link--inverse,
.text-link--inverse:visited {
  color: var(--color-text-inverse);
}

.text-link--inverse:focus-visible {
  outline-color: var(--color-focus-ring-inverse);
}

.text-link__icon {
  display: inline-block;
  inline-size: var(--size-icon-small);
  block-size: var(--size-icon-small);
  margin-inline-start: var(--space-1);
  vertical-align: -0.125em;
}

.button {
  display: inline-flex;
  min-block-size: var(--button-min-block-size);
  max-inline-size: 100%;
  align-items: center;
  justify-content: center;
  gap: var(--button-gap);
  margin: 0;
  padding-block: var(--button-padding-block);
  padding-inline: var(--button-padding-inline);
  border: var(--button-border-width) solid transparent;
  border-radius: var(--button-radius);
  appearance: none;
  font-family: var(--font-family-body);
  font-size: var(--font-size-interface);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-interface);
  line-height: var(--line-height-compact);
  text-align: center;
  text-decoration: none;
  touch-action: manipulation;
  transform: translateY(0);
  transition-duration: var(--duration-fast);
  transition-property: color, background-color, border-color, transform;
  transition-timing-function: var(--easing-standard);
  user-select: none;
}

button.button {
  cursor: pointer;
}

.button--primary,
.button--primary:visited {
  color: var(--color-action-primary-text);
  background: var(--color-action-primary);
  border-color: var(--color-action-primary);
}

.button--primary:active {
  background: var(--color-action-primary-active);
  border-color: var(--color-action-primary-active);
}

.button--secondary,
.button--secondary:visited {
  color: var(--color-action-secondary-text);
  background: var(--color-action-secondary);
  border-color: var(--color-action-secondary-border);
}

.button--secondary:active {
  color: var(--color-action-primary-text);
  background: var(--color-action-primary-active);
  border-color: var(--color-action-primary-active);
}

.button--quiet,
.button--quiet:visited {
  color: var(--color-link);
  background: transparent;
  border-color: transparent;
}

.button--quiet:active {
  color: var(--color-action-primary-text);
  background: var(--color-action-primary-active);
}

.button--inverse,
.button--inverse:visited {
  color: var(--color-text-brand);
  background: var(--color-text-inverse);
  border-color: var(--color-text-inverse);
}

.button--inverse:active {
  background: var(--color-background-selected);
  border-color: var(--color-background-selected);
}

.button--secondary-inverse,
.button--secondary-inverse:visited {
  color: var(--color-text-inverse);
  background: transparent;
  border-color: var(--color-text-inverse);
}

.button--secondary-inverse:active {
  color: var(--color-text-brand);
  background: var(--color-background-selected);
  border-color: var(--color-background-selected);
}

.button--inverse:focus-visible,
.button--secondary-inverse:focus-visible {
  outline-color: var(--color-focus-ring-inverse);
}

.button--compact {
  --button-padding-block: var(--space-2);
  --button-padding-inline: var(--space-4);
}

.button--full {
  inline-size: 100%;
}

.button__icon {
  flex: 0 0 auto;
  inline-size: var(--size-icon-small);
  block-size: var(--size-icon-small);
}

.button:disabled {
  color: var(--color-action-disabled-text);
  background: var(--color-action-disabled);
  border-color: var(--color-action-disabled);
  cursor: not-allowed;
}

.button:active:not(:disabled) {
  transform: translateY(0);
}

[data-contact-submit]:not([data-motion-ready]) {
  transition-duration: var(--duration-instant);
}

@media (hover: hover) {
  a:not([class]):hover,
  .text-link:hover {
    color: var(--color-link-hover);
  }

  .text-link--inverse:hover {
    color: var(--color-text-inverse-strong);
  }

  .button:not(:disabled):hover {
    transform: translateY(-1px);
  }

  .button--primary:hover {
    color: var(--color-action-primary-text);
    background: var(--color-action-primary-hover);
    border-color: var(--color-action-primary-hover);
  }

  .button--secondary:hover {
    color: var(--color-action-secondary-text);
    background: var(--color-action-secondary-hover);
    border-color: var(--color-action-secondary-border);
  }

  .button--quiet:hover {
    color: var(--color-link-hover);
    background: var(--color-background-subtle);
  }

  .button--inverse:hover {
    color: var(--color-text-brand);
    background: var(--color-background-selected);
    border-color: var(--color-background-selected);
  }

  .button--secondary-inverse:hover {
    color: var(--color-text-brand);
    background: var(--color-background-selected);
    border-color: var(--color-background-selected);
  }

  .button:disabled:hover {
    color: var(--color-action-disabled-text);
    background: var(--color-action-disabled);
    border-color: var(--color-action-disabled);
  }
}

@media (prefers-reduced-motion: reduce) {
  .button,
  .button:not(:disabled):hover {
    transform: none;
  }
}

@media (forced-colors: active) {
  .button {
    border-color: ButtonText;
  }

  .button:disabled {
    color: GrayText;
    border-color: GrayText;
  }
}

/*
 * D.4 — Cards and Service Cards
 *
 * Cards organize related public information. They are not interactive
 * controls by default; links and buttons inside them retain their own states.
 */

:root {
  --card-padding: var(--space-6);
  --card-gap: var(--space-4);
  --card-border-width: var(--border-width-thin);
  --card-radius: var(--radius-medium);
  --card-background: var(--color-background-surface);
  --card-border-color: var(--color-border-default);
  --card-text-color: var(--color-text-primary);
  --card-muted-color: var(--color-text-secondary);
  --card-title-color: var(--color-text-brand);
  --card-accent-color: var(--color-decoration-copper);
  --card-eyebrow-color: var(--color-text-accent);
  --card-shadow: var(--shadow-small);
  --service-card-accent-width: var(--border-width-strong);
}

.card {
  display: flex;
  min-inline-size: 0;
  block-size: 100%;
  flex-direction: column;
  gap: var(--card-gap);
  padding: var(--card-padding);
  overflow-wrap: anywhere;
  color: var(--card-text-color);
  background: var(--card-background);
  border: var(--card-border-width) solid var(--card-border-color);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
}

.card--subtle {
  --card-background: var(--color-background-subtle);
  --card-shadow: none;
}

.card--brand {
  --card-background: var(--color-background-brand);
  --card-border-color: var(--color-border-brand);
  --card-text-color: var(--color-text-inverse);
  --card-muted-color: var(--color-text-inverse);
  --card-title-color: var(--color-text-inverse-strong);
  --card-eyebrow-color: var(--color-text-accent-inverse);
  --card-shadow: none;
}

.card--compact {
  --card-padding: var(--space-5);
  --card-gap: var(--space-3);
}

.card--flat {
  --card-shadow: none;
}

.card__header {
  display: grid;
  gap: var(--space-2);
}

.card__eyebrow {
  margin: 0;
  color: var(--card-eyebrow-color);
  font-size: var(--font-size-eyebrow);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-eyebrow);
  line-height: var(--line-height-interface);
  text-transform: uppercase;
}

.card__title,
.service-card__title,
.feature-card__title {
  margin: 0;
  color: var(--card-title-color);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-regular);
  letter-spacing: var(--letter-spacing-heading);
  line-height: var(--line-height-heading-small);
}

.card__body {
  display: grid;
  gap: var(--space-4);
  color: var(--card-muted-color);
}

.card__body > * {
  max-inline-size: 100%;
}

.card__footer,
.service-card__footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-block-start: auto;
  padding-block-start: var(--space-2);
}

.card__icon,
.service-card__icon,
.feature-card__icon {
  flex: 0 0 auto;
  inline-size: var(--size-icon-large);
  block-size: var(--size-icon-large);
  color: var(--card-accent-color);
}

.service-card {
  border-block-start-color: var(--card-accent-color);
  border-block-start-width: var(--service-card-accent-width);
}

.service-card__marker {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-block-size: var(--size-icon-large);
  color: var(--card-eyebrow-color);
  font-size: var(--font-size-eyebrow);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-eyebrow);
  line-height: var(--line-height-interface);
  text-transform: uppercase;
}

.service-card__description,
.feature-card__description {
  margin: 0;
  color: var(--card-muted-color);
}

.service-grid {
  --layout-min: 100%;
}

.feature-grid {
  --layout-min: 100%;
}

.service-overview__footer {
  display: grid;
  gap: var(--space-4);
  align-items: center;
  padding-block-start: var(--space-6);
  border-block-start: var(--border-width-thin) solid
    var(--color-border-default);
}

.service-overview__note {
  max-inline-size: var(--measure-reading);
  margin: 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-lead);
  text-wrap: pretty;
}

.service-overview__footer .text-link {
  display: inline-flex;
  min-block-size: var(--size-touch-target);
  align-items: center;
  justify-self: start;
}

.feature-card {
  --card-background: transparent;
  --card-border-color: transparent;
  --card-radius: var(--radius-none);
  --card-shadow: none;

  border-inline-start-color: var(--card-accent-color);
  border-inline-start-width: var(--border-width-strong);
}

@media (min-width: 48rem) {
  :root {
    --card-padding: var(--space-8);
  }

  .service-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .service-grid--five {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .service-grid--five > * {
    grid-column: span 2;
  }

  .service-grid--five > :last-child {
    grid-column: 2 / span 2;
  }

  .feature-grid--five {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .feature-grid--five > * {
    grid-column: span 2;
  }

  .feature-grid--five > :last-child {
    grid-column: 2 / span 2;
  }

  .service-overview__footer {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 64rem) {
  .service-grid--five {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .service-grid--five > * {
    grid-column: span 2;
  }

  .service-grid--five > :nth-last-child(-n + 2) {
    grid-column: span 3;
  }

  .service-grid--five > :last-child {
    grid-column: span 3;
  }

  .feature-grid--five {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .feature-grid--five > * {
    grid-column: span 2;
  }

  .feature-grid--five > :nth-last-child(-n + 2) {
    grid-column: span 3;
  }

  .feature-grid--five > :last-child {
    grid-column: span 3;
  }
}

@media (forced-colors: active) {
  .card {
    border-color: CanvasText;
    box-shadow: none;
  }

  .service-card {
    border-block-start-color: Highlight;
  }

  .feature-card {
    border-inline-start-color: Highlight;
  }

  .service-overview__footer {
    border-block-start-color: CanvasText;
  }
}

@media print {
  .card {
    break-inside: avoid;
    box-shadow: none;
  }
}

/*
 * D.5 — Section Headers and Content Patterns
 *
 * These patterns establish editorial hierarchy without prescribing a page
 * section's final content or changing the document's semantic heading order.
 */

:root {
  --section-header-gap: var(--space-4);
  --section-header-title-size: var(--font-size-h2);
  --section-header-title-measure: var(--measure-wide);
  --section-header-eyebrow-color: var(--color-text-accent);
  --section-header-title-color: var(--color-text-brand);
  --section-header-intro-color: var(--color-text-secondary);
  --content-flow-space: var(--space-4);
  --content-heading-space: var(--space-8);
  --content-text-color: var(--color-text-primary);
  --content-muted-color: var(--color-text-secondary);
  --content-heading-color: var(--color-text-brand);
  --content-accent-color: var(--color-decoration-copper);
  --content-callout-background: var(--color-background-subtle);
  --content-divider-color: var(--color-border-default);
}

.section-header {
  display: grid;
  max-inline-size: var(--section-header-title-measure);
  gap: var(--section-header-gap);
}

.section-header--centered {
  justify-items: center;
  margin-inline: auto;
  text-align: center;
}

.section-header--split {
  max-inline-size: none;
}

.section-header--compact {
  --section-header-gap: var(--space-3);
  --section-header-title-size: var(--font-size-h3);
  --section-header-title-measure: var(--measure-compact);
}

.section-header--inverse {
  --section-header-eyebrow-color: var(--color-text-accent-inverse);
  --section-header-title-color: var(--color-text-inverse-strong);
  --section-header-intro-color: var(--color-text-inverse);
}

.section-header__heading,
.section-header__support {
  display: grid;
  gap: var(--section-header-gap);
  min-inline-size: 0;
}

.section-header__heading {
  gap: var(--space-2);
}

.section-header__eyebrow {
  margin: 0;
  color: var(--section-header-eyebrow-color);
  font-size: var(--font-size-eyebrow);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-eyebrow);
  line-height: var(--line-height-interface);
  text-transform: uppercase;
}

.section-header__title {
  max-inline-size: var(--section-header-title-measure);
  margin: 0;
  overflow-wrap: anywhere;
  color: var(--section-header-title-color);
  font-family: var(--font-family-heading);
  font-size: var(--section-header-title-size);
  font-weight: var(--font-weight-regular);
  letter-spacing: var(--letter-spacing-heading);
  line-height: var(--line-height-heading);
  text-wrap: balance;
}

.section-header__intro {
  max-inline-size: var(--measure-reading);
  margin: 0;
  color: var(--section-header-intro-color);
  font-size: var(--font-size-lead);
  line-height: var(--line-height-body);
  text-wrap: pretty;
}

.section-header__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.section-header--centered .section-header__actions {
  justify-content: center;
}

.content-lead {
  max-inline-size: var(--measure-reading);
  margin: 0;
  overflow-wrap: anywhere;
  color: var(--content-muted-color);
  font-size: var(--font-size-lead);
  line-height: var(--line-height-body);
  text-wrap: pretty;
}

.content-lead--inverse {
  color: var(--color-text-inverse);
}

.content-prose {
  max-inline-size: var(--measure-reading);
  overflow-wrap: anywhere;
  color: var(--content-text-color);
}

.content-prose > * {
  margin-block: 0;
}

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

.content-prose > :is(h2, h3, h4) {
  margin-block-start: var(--content-heading-space);
  color: var(--content-heading-color);
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-regular);
  letter-spacing: var(--letter-spacing-heading);
  line-height: var(--line-height-heading-small);
  text-wrap: balance;
}

.content-prose > h2 {
  font-size: var(--font-size-h3);
}

.content-prose > h3 {
  font-size: var(--font-size-h4);
}

.content-prose > h4 {
  font-size: var(--font-size-lead);
}

.content-prose > :first-child {
  margin-block-start: 0;
}

.content-prose > :is(ul, ol) {
  padding-inline-start: var(--space-6);
}

.content-prose li + li {
  margin-block-start: var(--space-2);
}

.content-prose li::marker {
  color: var(--content-accent-color);
  font-weight: var(--font-weight-semibold);
}

.content-prose--inverse {
  --content-text-color: var(--color-text-inverse);
  --content-muted-color: var(--color-text-inverse);
  --content-heading-color: var(--color-text-inverse-strong);
  --content-accent-color: var(--color-text-accent-inverse);
}

.content-list {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding-inline-start: var(--space-6);
  color: var(--content-text-color);
}

.content-list li::marker {
  color: var(--content-accent-color);
  font-weight: var(--font-weight-semibold);
}

.content-list--divided {
  gap: 0;
  padding-inline-start: 0;
  border-block-start: var(--border-width-thin) solid
    var(--content-divider-color);
  list-style: none;
}

.content-list--divided > li {
  padding-block: var(--space-4);
  border-block-end: var(--border-width-thin) solid
    var(--content-divider-color);
}

.process-list {
  display: grid;
  margin: 0;
  padding-inline-start: var(--space-12);
  border-block-start: var(--border-width-thin) solid
    var(--content-divider-color);
  list-style-type: decimal-leading-zero;
}

.process-stage {
  padding-block: var(--space-6);
  padding-inline-start: var(--space-2);
  border-block-end: var(--border-width-thin) solid
    var(--content-divider-color);
}

.process-stage::marker {
  color: var(--content-accent-color);
  font-size: var(--font-size-eyebrow);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-eyebrow);
  line-height: var(--line-height-interface);
}

.process-stage__body {
  display: grid;
  max-inline-size: var(--measure-reading);
  gap: var(--space-2);
}

.process-stage__title {
  margin: 0;
  color: var(--content-heading-color);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-regular);
  letter-spacing: var(--letter-spacing-heading);
  line-height: var(--line-height-heading-small);
  text-wrap: balance;
}

.process-stage__description {
  margin: 0;
  color: var(--content-muted-color);
}

.content-callout {
  display: grid;
  gap: var(--space-3);
  max-inline-size: var(--measure-reading);
  padding: var(--space-5);
  color: var(--content-text-color);
  background: var(--content-callout-background);
  border-inline-start: var(--border-width-strong) solid
    var(--content-accent-color);
}

.content-callout--brand {
  --content-text-color: var(--color-text-inverse);
  --content-muted-color: var(--color-text-inverse);
  --content-heading-color: var(--color-text-inverse-strong);
  --content-accent-color: var(--color-text-accent-inverse);
  --content-callout-background: var(--color-background-brand);
}

.content-callout__title {
  margin: 0;
  color: var(--content-heading-color);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-regular);
  letter-spacing: var(--letter-spacing-heading);
  line-height: var(--line-height-heading-small);
}

.content-callout__body {
  display: grid;
  gap: var(--space-3);
  color: var(--content-muted-color);
}

.content-callout__body > * {
  max-inline-size: 100%;
  margin: 0;
}

@media (min-width: 48rem) {
  .process-stage {
    padding-block: var(--space-8);
    padding-inline-start: var(--space-4);
  }
}

@media (min-width: 64rem) {
  .section-header--split {
    grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.65fr);
    align-items: end;
    column-gap: var(--space-12);
  }
}

@media (forced-colors: active) {
  .content-list--divided,
  .content-list--divided > li,
  .process-list,
  .process-stage {
    border-color: CanvasText;
  }

  .content-callout {
    color: CanvasText;
    background: Canvas;
    border-inline-start-color: Highlight;
  }
}

@media print {
  .content-callout {
    color: CanvasText;
    background: transparent;
    border-inline-start-color: CanvasText;
  }
}

/*
 * D.6 — Navigation and Footer Patterns
 *
 * These styles define the visual component language. Phase E supplies the
 * production landmarks, destinations, and progressively enhanced menu logic.
 */

:root {
  --site-header-background: var(--color-background-surface);
  --site-header-border-color: var(--color-border-default);
  --site-brand-color: var(--color-text-brand);
  --site-brand-hover-color: var(--color-green-700);
  --nav-link-color: var(--color-text-strong);
  --nav-link-hover-color: var(--color-text-brand);
  --nav-link-hover-background: var(--color-background-subtle);
  --nav-link-current-color: var(--color-text-brand);
  --nav-link-current-background: var(--color-background-subtle);
  --nav-link-current-accent: var(--color-decoration-copper);
  --navigation-disclosure-offset: calc(var(--space-1) * -1);
  --site-footer-background: var(--color-background-brand-deep);
  --site-footer-text: var(--color-text-inverse);
  --site-footer-text-strong: var(--color-text-inverse-strong);
  --site-footer-text-muted: var(--color-green-100);
  --site-footer-link: var(--color-text-inverse);
  --site-footer-link-hover: var(--color-text-inverse-strong);
  --site-footer-accent: var(--color-text-accent-inverse);
  --site-footer-border-color: var(--color-green-800);
}

.site-header {
  color: var(--color-text-primary);
  background: var(--site-header-background);
  border-block-end: var(--border-width-thin) solid
    var(--site-header-border-color);
}

.site-header__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
  padding-block: var(--space-3);
}

.site-brand,
.site-brand:visited {
  display: inline-flex;
  min-block-size: var(--size-touch-target);
  max-inline-size: 100%;
  align-items: center;
  justify-self: start;
  gap: var(--space-3);
  color: var(--site-brand-color);
  text-decoration: none;
  transition-duration: var(--duration-fast);
  transition-property: color;
  transition-timing-function: var(--easing-standard);
}

.site-brand__mark {
  flex: 0 0 auto;
  inline-size: var(--space-8);
  block-size: var(--space-8);
}

.site-brand__text {
  display: grid;
  gap: var(--space-1);
  min-inline-size: 0;
}

.site-brand__name {
  overflow-wrap: anywhere;
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-regular);
  letter-spacing: var(--letter-spacing-heading);
  line-height: var(--line-height-heading-small);
}

.site-brand__descriptor {
  overflow-wrap: anywhere;
  font-size: var(--font-size-eyebrow);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-eyebrow);
  line-height: var(--line-height-interface);
  text-transform: uppercase;
}

.primary-nav {
  grid-column: 1 / -1;
  min-inline-size: 0;
}

.nav-toggle:not([hidden]) + .primary-nav {
  opacity: 1;
  transform: translateY(0);
  transition-behavior: allow-discrete;
  transition-duration: var(--duration-moderate);
  transition-property: opacity, transform, display;
  transition-timing-function: var(--easing-standard);
}

.primary-nav[hidden],
.nav-toggle[hidden] {
  display: none;
}

.nav-toggle:not([hidden]) + .primary-nav[hidden] {
  opacity: 0;
  pointer-events: none;
  transform: translateY(var(--navigation-disclosure-offset));
}

.nav-toggle:not([hidden]) + .primary-nav:not([data-motion-ready]) {
  transition-duration: var(--duration-instant);
}

@starting-style {
  .nav-toggle:not([hidden]) + .primary-nav:not([hidden]) {
    opacity: 0;
    transform: translateY(var(--navigation-disclosure-offset));
  }
}

.primary-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.primary-nav__link,
.primary-nav__link:visited {
  display: flex;
  min-block-size: var(--size-touch-target);
  align-items: center;
  padding-block: var(--space-2);
  padding-inline: var(--space-3);
  overflow-wrap: anywhere;
  color: var(--nav-link-color);
  border-block-end: var(--border-width-strong) solid transparent;
  font-size: var(--font-size-interface);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-interface);
  line-height: var(--line-height-interface);
  text-decoration: none;
  transition-duration: var(--duration-fast);
  transition-property: color, background-color, border-color;
  transition-timing-function: var(--easing-standard);
}

.primary-nav__link[aria-current] {
  color: var(--nav-link-current-color);
  background: var(--nav-link-current-background);
  border-block-end-color: var(--nav-link-current-accent);
}

.site-header__actions {
  display: flex;
  grid-column: 1 / -1;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.nav-toggle {
  justify-self: end;
}

.nav-toggle[aria-expanded="true"] {
  color: var(--color-text-brand);
  background: var(--color-background-selected);
}

.nav-toggle__icon {
  flex: 0 0 auto;
  inline-size: var(--size-icon-medium);
  block-size: var(--size-icon-medium);
}

.site-footer {
  color: var(--site-footer-text);
  background: var(--site-footer-background);
}

.site-footer__inner {
  display: grid;
  gap: var(--space-8);
  padding-block: var(--space-section-compact);
}

.site-footer__main {
  display: grid;
  gap: var(--space-8);
}

.site-footer__brand,
.site-footer__brand:visited {
  display: grid;
  min-block-size: var(--size-touch-target);
  max-inline-size: var(--measure-compact);
  align-content: center;
  justify-self: start;
  gap: var(--space-2);
  color: var(--site-footer-text);
  text-decoration: none;
  transition-duration: var(--duration-fast);
  transition-property: color;
  transition-timing-function: var(--easing-standard);
}

.site-footer__name {
  color: var(--site-footer-text);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-regular);
  letter-spacing: var(--letter-spacing-heading);
  line-height: var(--line-height-heading-small);
  transition-duration: var(--duration-fast);
  transition-property: color;
  transition-timing-function: var(--easing-standard);
}

.site-footer__descriptor {
  color: var(--site-footer-text-muted);
  font-size: var(--font-size-interface);
  line-height: var(--line-height-interface);
}

.footer-nav {
  min-inline-size: 0;
}

.footer-nav__list {
  display: grid;
  grid-template-columns: repeat(
    auto-fit,
    minmax(min(100%, 8rem), 1fr)
  );
  gap: var(--space-1) var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-nav__link,
.footer-nav__link:visited {
  display: inline-flex;
  min-block-size: var(--size-touch-target);
  align-items: center;
  color: var(--site-footer-link);
  font-size: var(--font-size-interface);
  line-height: var(--line-height-interface);
  text-decoration: none;
  transition-duration: var(--duration-fast);
  transition-property: color, text-decoration-color;
  transition-timing-function: var(--easing-standard);
}

.footer-nav__link[aria-current] {
  color: var(--site-footer-link-hover);
  text-decoration-color: var(--site-footer-accent);
  text-decoration-line: underline;
  text-decoration-thickness: var(--link-underline-thickness);
  text-underline-offset: var(--link-underline-offset);
}

.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block-start: var(--space-6);
  border-block-start: var(--border-width-thin) solid
    var(--site-footer-border-color);
}

.site-footer__legal,
.site-footer__notice {
  margin: 0;
  color: var(--site-footer-text-muted);
  font-size: var(--font-size-secondary);
  line-height: var(--line-height-interface);
}

.site-footer__notice {
  max-inline-size: var(--measure-reading);
}

.site-footer a:focus-visible {
  outline-color: var(--color-focus-ring-inverse);
}

@media (hover: hover) {
  .site-brand:hover {
    color: var(--site-brand-hover-color);
  }

  .primary-nav__link:hover {
    color: var(--nav-link-hover-color);
    background: var(--nav-link-hover-background);
  }

  .site-footer__brand:hover {
    color: var(--site-footer-link-hover);
  }

  .site-footer__brand:hover .site-footer__name {
    color: var(--site-footer-link-hover);
  }

  .footer-nav__link:hover {
    color: var(--site-footer-link-hover);
    text-decoration-line: underline;
    text-decoration-thickness: var(--link-underline-thickness);
    text-underline-offset: var(--link-underline-offset);
  }
}

@media (min-width: 48rem) {
  .site-footer__main {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: start;
    column-gap: var(--space-12);
  }
}

@media (min-width: 64rem) {
  .site-header__inner {
    grid-template-columns: auto minmax(0, 1fr) auto;
  }

  .nav-toggle {
    display: none !important;
  }

  .primary-nav {
    grid-column: auto;
    justify-self: end;
  }

  .primary-nav__list {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .site-header__actions {
    grid-column: auto;
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav-toggle:not([hidden]) + .primary-nav,
  .nav-toggle:not([hidden]) + .primary-nav[hidden] {
    transform: none;
    transition-duration: var(--duration-instant);
    transition-property: none;
  }
}

@media (forced-colors: active) {
  .site-header,
  .site-footer__meta {
    border-color: CanvasText;
  }

  .primary-nav__link[aria-current] {
    border-block-end-color: Highlight;
  }

  .site-footer {
    color: CanvasText;
    background: Canvas;
  }

  .footer-nav__link[aria-current] {
    text-decoration-color: Highlight;
  }
}

@media print {
  .site-header,
  .site-footer {
    color: CanvasText;
    background: transparent;
  }

  .site-footer {
    --site-footer-text: CanvasText;
    --site-footer-text-strong: CanvasText;
    --site-footer-text-muted: CanvasText;
    --site-footer-link: CanvasText;
    --site-footer-link-hover: CanvasText;
    --site-footer-border-color: CanvasText;
  }

  .site-header {
    border-block-end-color: CanvasText;
  }

  .site-footer__meta {
    border-block-start-color: CanvasText;
  }
}

/*
 * D.7 — Form Controls and Feedback States
 *
 * These styles provide an accessible visual foundation. Phase J determines
 * the actual fields, validation logic, submission method, and reviewed copy.
 */

:root {
  --form-gap: var(--space-6);
  --form-row-gap: var(--space-4);
  --form-field-gap: var(--space-2);
  --form-control-min-block-size: var(--size-touch-target);
  --form-control-padding-block: var(--space-3);
  --form-control-padding-inline: var(--space-4);
  --form-control-background: var(--color-background-surface);
  --form-control-text: var(--color-text-primary);
  --form-control-placeholder: var(--color-text-secondary);
  --form-control-border: var(--color-border-strong);
  --form-control-border-focus: var(--color-border-brand);
  --form-control-border-error: var(--color-status-error);
  --form-control-border-success: var(--color-status-success);
  --form-control-disabled-background: var(--color-background-subtle);
  --form-control-disabled-text: var(--color-action-disabled-text);
  --form-control-readonly-background: var(--color-background-page);
  --form-label-color: var(--color-text-strong);
  --form-hint-color: var(--color-text-secondary);
  --form-error-color: var(--color-status-error);
  --form-success-color: var(--color-status-success);
  --feedback-color: var(--color-status-info);
  --feedback-background: var(--color-background-surface);
}

.form {
  display: grid;
  gap: var(--form-gap);
  min-inline-size: 0;
}

.form__row {
  display: grid;
  gap: var(--form-row-gap);
  min-inline-size: 0;
}

.form__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.form-group {
  display: grid;
  min-inline-size: 0;
  gap: var(--form-row-gap);
  margin: 0;
  padding: 0;
  border: 0;
}

.form-group__legend {
  margin-block-end: var(--space-3);
  padding: 0;
  color: var(--form-label-color);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-regular);
  letter-spacing: var(--letter-spacing-heading);
  line-height: var(--line-height-heading-small);
}

.form-field {
  display: grid;
  min-inline-size: 0;
  gap: var(--form-field-gap);
}

.form-field__label {
  color: var(--form-label-color);
  font-size: var(--font-size-interface);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-interface);
}

.form-field__required,
.form-field__optional {
  font-size: var(--font-size-secondary);
  font-weight: var(--font-weight-regular);
}

.form-field__required {
  color: var(--form-error-color);
}

.form-field__optional {
  color: var(--form-hint-color);
}

.form-field__hint,
.choice-field__hint {
  margin: 0;
  color: var(--form-hint-color);
  font-size: var(--font-size-secondary);
  line-height: var(--line-height-interface);
}

.form-field__error {
  margin: 0;
  color: var(--form-error-color);
  font-size: var(--font-size-secondary);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-interface);
}

.form-field__success {
  margin: 0;
  color: var(--form-success-color);
  font-size: var(--font-size-secondary);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-interface);
}

.form-control {
  display: block;
  inline-size: 100%;
  min-inline-size: 0;
  min-block-size: var(--form-control-min-block-size);
  padding-block: var(--form-control-padding-block);
  padding-inline: var(--form-control-padding-inline);
  color: var(--form-control-text);
  background: var(--form-control-background);
  border: var(--border-width-thin) solid var(--form-control-border);
  border-radius: var(--radius-small);
  font: inherit;
  line-height: var(--line-height-interface);
}

.form-control::placeholder {
  color: var(--form-control-placeholder);
  opacity: 1;
}

.form-control:focus-visible {
  border-color: var(--form-control-border-focus);
}

.form-control:disabled {
  color: var(--form-control-disabled-text);
  background: var(--form-control-disabled-background);
  border-color: var(--color-border-default);
  cursor: not-allowed;
}

.form-control[readonly] {
  background: var(--form-control-readonly-background);
}

.form-control[aria-invalid="true"],
.form-field--error .form-control {
  border-color: var(--form-control-border-error);
}

.form-field--success .form-control {
  border-color: var(--form-control-border-success);
}

textarea.form-control {
  min-block-size: var(--space-32);
  resize: vertical;
}

.choice-field {
  display: grid;
  grid-template-columns: var(--size-icon-medium) minmax(0, 1fr);
  min-block-size: var(--size-touch-target);
  align-items: start;
  gap: var(--space-3);
  padding-block: var(--space-2);
  color: var(--form-control-text);
  cursor: pointer;
}

.choice-field__control {
  inline-size: var(--size-icon-medium);
  block-size: var(--size-icon-medium);
  margin: var(--space-1) 0 0;
  accent-color: var(--color-action-primary);
}

.choice-field__content {
  display: grid;
  gap: var(--space-1);
  min-inline-size: 0;
}

.choice-field__label {
  color: var(--form-label-color);
  font-size: var(--font-size-interface);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-interface);
}

.choice-field__control:disabled {
  cursor: not-allowed;
}

.choice-field__control:disabled + .choice-field__content {
  color: var(--form-control-disabled-text);
}

.choice-field__control:disabled + .choice-field__content
  .choice-field__label,
.choice-field__control:disabled + .choice-field__content
  .choice-field__hint {
  color: inherit;
}

.feedback {
  --feedback-color: var(--color-status-info);

  display: flex;
  max-inline-size: var(--measure-reading);
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  color: var(--form-control-text);
  background: var(--feedback-background);
  border: var(--border-width-thin) solid var(--color-border-default);
  border-inline-start-color: var(--feedback-color);
  border-inline-start-width: var(--border-width-strong);
}

.feedback[hidden] {
  display: none;
}

.feedback--success {
  --feedback-color: var(--color-status-success);
}

.feedback--warning {
  --feedback-color: var(--color-status-warning);
}

.feedback--error {
  --feedback-color: var(--color-status-error);
}

.feedback--info {
  --feedback-color: var(--color-status-info);
}

.feedback__icon {
  flex: 0 0 auto;
  inline-size: var(--size-icon-medium);
  block-size: var(--size-icon-medium);
  margin-block-start: var(--space-1);
  color: var(--feedback-color);
}

.feedback__content {
  display: grid;
  min-inline-size: 0;
  gap: var(--space-2);
}

.feedback__title {
  margin: 0;
  color: var(--feedback-color);
  font-size: var(--font-size-interface);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-interface);
}

.feedback__body {
  display: grid;
  gap: var(--space-2);
}

.feedback__body > * {
  max-inline-size: 100%;
  margin: 0;
}

.feedback__list {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding-inline-start: var(--space-6);
}

.feedback__list li::marker {
  color: var(--feedback-color);
  font-weight: var(--font-weight-semibold);
}

@media (min-width: 48rem) {
  .form__row--two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (forced-colors: active) {
  .form-control {
    color: FieldText;
    background: Field;
    border-color: FieldText;
  }

  .form-control:disabled {
    color: GrayText;
    border-color: GrayText;
  }

  .form-control[aria-invalid="true"],
  .form-field--error .form-control,
  .form-field--success .form-control {
    border-color: Highlight;
  }

  .choice-field__control {
    accent-color: auto;
  }

  .feedback {
    color: CanvasText;
    background: Canvas;
    border-color: CanvasText;
    border-inline-start-color: Highlight;
  }
}

@media print {
  .form-control,
  .feedback {
    color: CanvasText;
    background: transparent;
    border-color: CanvasText;
  }
}

/*
 * D.8 — Accessibility Utilities
 *
 * Utilities solve narrow accessibility needs. They do not replace semantic
 * HTML, accurate labels, keyboard behavior, or assistive-technology testing.
 */

:root {
  --anchor-target-offset: var(--space-8);
  --skip-link-inset: var(--space-3);
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  inset-block-start: var(--skip-link-inset);
  inset-inline-start: var(--skip-link-inset);
  z-index: var(--layer-notification);
  display: inline-flex;
  min-block-size: var(--size-touch-target);
  max-inline-size: calc(100% - var(--skip-link-inset) - var(--skip-link-inset));
  align-items: center;
  justify-content: center;
  padding-block: var(--space-3);
  padding-inline: var(--space-4);
  overflow-wrap: anywhere;
  color: var(--color-action-primary-text);
  background: var(--color-action-primary);
  border: var(--border-width-strong) solid var(--color-action-primary);
  border-radius: var(--radius-small);
  font-size: var(--font-size-interface);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-interface);
  text-align: center;
  text-decoration: none;
}

.visually-hidden,
.visually-hidden-focusable:not(:focus):not(:active),
.skip-link:not(:focus):not(:active) {
  position: absolute !important;
  inline-size: var(--border-width-thin) !important;
  block-size: var(--border-width-thin) !important;
  margin: calc(-1 * var(--border-width-thin)) !important;
  padding: 0 !important;
  overflow: hidden !important;
  clip: rect(0 0 0 0) !important;
  clip-path: inset(50%) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.focus-ring-inverse:focus-visible {
  outline-color: var(--color-focus-ring-inverse);
}

.focus-target:focus {
  outline: var(--focus-ring-width) solid var(--color-focus-ring);
  outline-offset: var(--focus-ring-offset);
}

.touch-target {
  display: inline-flex;
  min-inline-size: var(--size-touch-target);
  min-block-size: var(--size-touch-target);
  max-inline-size: 100%;
  align-items: center;
  justify-content: center;
}

.anchor-target {
  scroll-margin-block-start: var(--anchor-target-offset);
}

.reflow-safe {
  min-inline-size: 0;
  max-inline-size: 100%;
  overflow-wrap: anywhere;
}

@media (forced-colors: active) {
  .skip-link {
    color: LinkText;
    background: Canvas;
    border-color: LinkText;
  }

  .focus-target:focus {
    outline-color: Highlight;
  }
}

@media print {
  .skip-link {
    display: none;
  }
}

/*
 * K.5 — Optional Section Reveal
 *
 * Baseline content has no reveal state and remains fully visible. JavaScript
 * applies these states only when the enhancement can run safely.
 */

:root {
  --section-reveal-offset: var(--space-3);
}

[data-reveal-state="pending"],
[data-reveal-state="visible"] {
  transition-duration: var(--duration-slow);
  transition-property: opacity, transform;
  transition-timing-function: var(--easing-decelerate);
}

[data-reveal-state="pending"] {
  opacity: 0;
  transform: translateY(var(--section-reveal-offset));
}

[data-reveal-state="visible"] {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal-state="pending"],
  [data-reveal-state="visible"] {
    opacity: 1;
    transform: none;
    transition-property: none;
  }
}

@media print {
  [data-reveal-state="pending"],
  [data-reveal-state="visible"] {
    opacity: 1;
    transform: none;
    transition-property: none;
  }
}