/* Minimal custom CSS for visual interest and layout clarity */

:root {
  --color-bg: #ffffff;
  --color-text: #1b1b1b;
  --color-emphasis: #005ea2;
  --color-highlight-bg: #f0f0f0;
  --color-surface-footer: #1b1b1b;
  --color-link-footer: #58b4ff;
}

html.theme-dark {
  --color-bg: #1b1b1b;
  --color-text: #f0f0f0;
  --color-emphasis: #58b4ff;
  --color-highlight-bg: #202020;
  --color-surface-footer: #000000;
  --color-link-footer: #8fd0ff;
}

html.theme-light {
  --color-bg: #ffffff;
  --color-text: #1b1b1b;
  --color-emphasis: #005ea2;
  --color-highlight-bg: #f0f0f0;
  --color-surface-footer: #1b1b1b;
  --color-link-footer: #58b4ff;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
}

html.theme-dark body {
  color: var(--color-text);
}

/* Project notice banner */
.project-notice {
  background-color: #f5f5f0;
  border-bottom: 1px solid #d9d9d9;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

.project-notice__text {
  margin: 0.5rem 0;
  font-size: 0.95rem;
}

.theme-toggle {
  margin-left: auto;
}

.usa-navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.theme-toggle__button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.25rem 0.5rem;
  border-radius: 999px;
  text-decoration: none;
  color: inherit;
}

.theme-toggle__icon {
  font-size: 1.1rem;
  line-height: 1;
}

.theme-toggle__icon--moon {
  margin-left: 0.25rem;
}

/* Show only the icon that represents the next available mode */
html.theme-light .theme-toggle__icon--sun {
  display: none;
}

html.theme-light .theme-toggle__icon--moon {
  display: inline;
}

html.theme-dark .theme-toggle__icon--sun {
  display: inline;
  color: #ffd65c; /* high-contrast sun icon on dark */
}

html.theme-dark .theme-toggle__icon--moon {
  display: none;
}

/* Hero section styling */
.hero-section {
  padding-top: 3rem;
  padding-bottom: 2rem;
}

.hero-section h1 {
  margin-bottom: 1.5rem;
  line-height: 1.3;
  font-size: 2rem;
}

/* Section visual distinction */
.section-highlight {
  background-color: var(--color-highlight-bg);
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
}

.section-cta {
  border-top: 2px solid var(--color-emphasis);
  border-bottom: 2px solid var(--color-emphasis);
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
  margin-top: 2rem;
  margin-bottom: 2rem;
}

.quick-summary {
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
}

/* Improve readability */
main p {
  max-width: 68ex;
}

main ul {
  max-width: 65ex;
  line-height: 1.6;
}

main li {
  margin-bottom: 0.5rem;
}

/* Footer styling */
.usa-footer__primary-section {
  background-color: var(--color-surface-footer);
}

.usa-footer__primary-section p {
  color: white;
  margin-bottom: 0.5rem;
  max-width: none;
}

.usa-footer__primary-section a {
  color: var(--color-link-footer);
}

.usa-footer__primary-section a:hover {
  color: #ffffff;
}

/* Skip link visibility */
.usa-skipnav {
  position: absolute;
  left: -999px;
  background: #0050d8;
  color: white;
  padding: 1rem 1.5rem;
  text-decoration: none;
  z-index: 100000;
}

.usa-skipnav:focus {
  left: 0;
  top: 0;
}

/* Ensure focus visibility throughout */
a:focus,
button:focus,
.usa-button:focus,
.usa-button--unstyled:focus,
.theme-toggle__button:focus {
  outline: 2px solid #2491ff !important;
  outline-offset: 2px;
  box-shadow: 0 0 0 3px rgba(36, 145, 255, 0.5);
}

/* Ensure link contrast in dark mode */
html.theme-dark a {
  color: #8fd0ff;
}

html.theme-dark a:hover {
  color: #ffffff;
}

/* Preserve sufficient contrast for links inside light summary box in dark mode */
html.theme-dark .usa-summary-box {
  background-color: #102a43;
  border-color: #58b4ff;
}

html.theme-dark .usa-summary-box__heading,
html.theme-dark .usa-summary-box__text {
  color: #f0f0f0;
}

/* Mobile-first adjustments */
@media (max-width: 640px) {
  .hero-section {
    padding-top: 2rem;
    padding-bottom: 1.5rem;
  }

  .section-cta {
    margin-top: 1.5rem;
    margin-bottom: 1.5rem;
    padding-top: 2rem;
    padding-bottom: 2rem;
  }

  .section-cta .usa-button {
    width: 100%;
    max-width: 24rem;
  }
}