:root {
  --theme-transition: 180ms ease;
  --night-canvas: #050505;
  --night-surface: #080808;
  --night-surface-raised: #0c0c0c;
  --night-border: #242424;
  --night-text: #f2f2f2;
  --night-muted: #a3a3a3;
  --night-faint: #737373;
  --night-accent: #62d9ff;
  --night-accent-strong: #9be7ff;
  --night-signal: #b9f76d;
}

html {
  color-scheme: light;
  background: #fff;
}

html[data-theme="dark"] {
  color-scheme: dark;
  background: var(--night-canvas);
}

body,
.masthead,
.greedy-nav,
.initial-content,
.page__footer,
.archive,
.page,
.sidebar {
  transition: color var(--theme-transition), background-color var(--theme-transition), border-color var(--theme-transition);
}

.theme-toggle {
  display: grid;
  width: 36px;
  height: 36px;
  padding: 0;
  margin: 0 4px 0 8px;
  color: #475569;
  background: transparent;
  border: 1px solid #e2e8f0;
  border-radius: 50%;
  cursor: pointer;
  place-items: center;
  transition: color var(--theme-transition), background var(--theme-transition), border-color var(--theme-transition), transform var(--theme-transition);
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  color: #0f172a;
  background: #f8fafc;
  border-color: #cbd5e1;
  outline: none;
  transform: translateY(-1px);
}

.theme-toggle:focus-visible {
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.theme-toggle__icon {
  grid-area: 1 / 1;
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
  transition: opacity var(--theme-transition), transform var(--theme-transition);
}

.theme-toggle__icon--sun {
  opacity: 0;
  transform: rotate(-35deg) scale(0.7);
}

html[data-theme="dark"] .theme-toggle__icon--moon {
  opacity: 0;
  transform: rotate(35deg) scale(0.7);
}

html[data-theme="dark"] .theme-toggle__icon--sun {
  opacity: 1;
  transform: rotate(0) scale(1);
}

html[data-theme="dark"] body {
  color: var(--night-text);
  background: var(--night-canvas);
}

html[data-theme="dark"] body::before {
  display: none;
}

html[data-theme="dark"] .masthead,
html[data-theme="dark"] .greedy-nav {
  background: var(--night-canvas) !important;
  border-color: var(--night-border) !important;
}

html[data-theme="dark"] .masthead {
  box-shadow: none;
}

html[data-theme="dark"] .site-title,
html[data-theme="dark"] .greedy-nav a.site-title {
  color: var(--night-text) !important;
}

html[data-theme="dark"] .greedy-nav a {
  color: var(--night-muted) !important;
}

html[data-theme="dark"] .greedy-nav a:hover,
html[data-theme="dark"] .greedy-nav a:focus-visible,
html[data-theme="dark"] .greedy-nav a.section-nav-link.active,
html[data-theme="dark"] .greedy-nav a.section-nav-link[aria-current="location"] {
  color: var(--night-accent-strong) !important;
}

html[data-theme="dark"] .greedy-nav .visible-links a::before {
  background: var(--night-accent) !important;
}

html[data-theme="dark"] .greedy-nav__toggle {
  background-color: var(--night-canvas) !important;
}

html[data-theme="dark"] .theme-toggle {
  color: var(--night-accent);
  background: var(--night-canvas);
  border-color: var(--night-border);
}

html[data-theme="dark"] .theme-toggle:hover,
html[data-theme="dark"] .theme-toggle:focus-visible {
  color: var(--night-signal);
  background: #0d0d0d;
  border-color: #3a3a3a;
}

html[data-theme="dark"] .theme-toggle:focus-visible {
  box-shadow: 0 0 0 3px rgba(98, 217, 255, 0.2);
}

html[data-theme="dark"] .initial-content,
html[data-theme="dark"] .archive,
html[data-theme="dark"] .page,
html[data-theme="dark"] .sidebar,
html[data-theme="dark"] .page__footer {
  color: var(--night-text);
  background-color: transparent;
}

html[data-theme="dark"] h1,
html[data-theme="dark"] h2,
html[data-theme="dark"] h3,
html[data-theme="dark"] h4,
html[data-theme="dark"] h5,
html[data-theme="dark"] h6,
html[data-theme="dark"] strong,
html[data-theme="dark"] .archive__item-title a,
html[data-theme="dark"] .page__title a {
  color: var(--night-text);
}

html[data-theme="dark"] p,
html[data-theme="dark"] li,
html[data-theme="dark"] .page__meta,
html[data-theme="dark"] .archive__item-excerpt,
html[data-theme="dark"] figcaption {
  color: var(--night-muted);
}

html[data-theme="dark"] a {
  color: var(--night-accent);
}

html[data-theme="dark"] a:hover,
html[data-theme="dark"] a:focus-visible {
  color: var(--night-accent-strong);
}

html[data-theme="dark"] hr,
html[data-theme="dark"] table,
html[data-theme="dark"] th,
html[data-theme="dark"] td,
html[data-theme="dark"] .page__content h2,
html[data-theme="dark"] .archive__item {
  border-color: var(--night-border);
}

html[data-theme="dark"] blockquote {
  color: var(--night-muted);
  border-left-color: var(--night-accent);
}

html[data-theme="dark"] code {
  color: #dff7ff;
  background: #111;
}

html[data-theme="dark"] pre,
html[data-theme="dark"] div.highlighter-rouge,
html[data-theme="dark"] figure.highlight {
  background: #080808;
  border-color: var(--night-border);
}

/* Homepage: distinct editorial-dark treatment for existing content. */
html[data-theme="dark"] .layout--home .doc-archive__body {
  position: relative;
}

html[data-theme="dark"] .doc-home {
  color: var(--night-muted);
}

html[data-theme="dark"] .doc-home [style*="0.65em"],
html[data-theme="dark"] .doc-home [style*="#666"] {
  color: var(--night-muted) !important;
}

html[data-theme="dark"] .doc-home h4[style*="0.685em"],
html[data-theme="dark"] .doc-home h4[style*="font-size: 0.685em"] {
  color: var(--night-text) !important;
  border-bottom-color: var(--night-border) !important;
}

html[data-theme="dark"] .home-profile::after {
  background: rgba(98, 217, 255, 0.32);
}

html[data-theme="dark"] .home-profile__photo img {
  border: 1px solid var(--night-border);
  box-shadow: none;
}

html[data-theme="dark"] .doc-home .home-profile h1,
html[data-theme="dark"] .doc-home .home-section-title,
html[data-theme="dark"] .doc-home .speaking-subtitle,
html[data-theme="dark"] .doc-home .portfolio-subtitle {
  color: var(--night-text);
}

html[data-theme="dark"] .doc-home .home-profile__focus {
  color: var(--night-accent) !important;
}

html[data-theme="dark"] .doc-home .home-profile__tagline,
html[data-theme="dark"] .doc-home .speaking-intro,
html[data-theme="dark"] .doc-home .portfolio-intro {
  color: var(--night-muted) !important;
}

html[data-theme="dark"] .doc-home .home-profile__links a {
  color: var(--night-muted);
}

html[data-theme="dark"] .doc-home .home-profile__links a:hover,
html[data-theme="dark"] .doc-home .home-profile__links a:focus-visible {
  color: var(--night-signal);
}

html[data-theme="dark"] .timeline-entry .year,
html[data-theme="dark"] .doc-home .speaking-card__meta,
html[data-theme="dark"] .doc-home .portfolio-kicker,
html[data-theme="dark"] .doc-home .credential-card span,
html[data-theme="dark"] .doc-home .project-card__header span,
html[data-theme="dark"] .doc-home .research-list span,
html[data-theme="dark"] .doc-home .research-list em {
  color: var(--night-faint);
}

html[data-theme="dark"] .timeline-entry__rail {
  border-left-color: var(--night-border);
}

html[data-theme="dark"] .timeline-entry__dot {
  background: var(--night-accent);
  border-color: var(--night-canvas);
  box-shadow: 0 0 0 3px rgba(98, 217, 255, 0.1);
}

html[data-theme="dark"] .timeline-entry__description {
  color: var(--night-muted);
}

html[data-theme="dark"] .timeline-entry__rail img {
  background: #fff;
  box-shadow: 0 0 0 1px var(--night-border);
}

html[data-theme="dark"] .credential-card,
html[data-theme="dark"] .doc-home .writing-card,
html[data-theme="dark"] .project-card,
html[data-theme="dark"] .doc-home .speaking-card {
  color: var(--night-text);
  background: var(--night-surface);
  border-color: var(--night-border);
  border-radius: 8px;
  box-shadow: none;
}

html[data-theme="dark"] .doc-home a.writing-card:hover,
html[data-theme="dark"] .doc-home a.writing-card:focus-visible,
html[data-theme="dark"] .doc-home a.speaking-card:hover,
html[data-theme="dark"] .doc-home a.speaking-card:focus-visible {
  color: var(--night-text);
  border-color: rgba(98, 217, 255, 0.55);
  box-shadow: none;
}

html[data-theme="dark"] .doc-home .credential-card strong,
html[data-theme="dark"] .doc-home .writing-card h3,
html[data-theme="dark"] .doc-home .project-card h3,
html[data-theme="dark"] .doc-home .speaking-card h3,
html[data-theme="dark"] .doc-home .research-list strong,
html[data-theme="dark"] .doc-home .portfolio-link-row strong {
  color: var(--night-text);
}

html[data-theme="dark"] .doc-home .writing-card p,
html[data-theme="dark"] .doc-home .project-card p,
html[data-theme="dark"] .doc-home .speaking-card p {
  color: var(--night-muted);
}

html[data-theme="dark"] .doc-home .portfolio-action,
html[data-theme="dark"] .doc-home .speaking-card__action,
html[data-theme="dark"] .doc-home .project-card__links a,
html[data-theme="dark"] .doc-home .portfolio-link-row span {
  color: var(--night-signal);
}

html[data-theme="dark"] .research-list,
html[data-theme="dark"] .doc-home .research-list a,
html[data-theme="dark"] .portfolio-link-row,
html[data-theme="dark"] .doc-home .portfolio-link-row a + a {
  border-color: var(--night-border);
}

html[data-theme="dark"] .doc-home .research-list a {
  color: var(--night-text);
}

html[data-theme="dark"] .doc-home .research-list a:hover strong,
html[data-theme="dark"] .doc-home .research-list a:focus-visible strong {
  color: var(--night-accent);
}

html[data-theme="dark"] .doc-home .portfolio-link-row a {
  color: var(--night-text);
}

html[data-theme="dark"] .speaking-card__image {
  background: #0a0a0a;
}

/* Shared article and archive surfaces. */
html[data-theme="dark"] .doc-shell-card,
html[data-theme="dark"] .embed-shell,
html[data-theme="dark"] .x-card {
  background: var(--night-surface);
  border-color: var(--night-border);
  box-shadow: none;
}

html[data-theme="dark"] .doc-hero {
  background: #080808;
  border-bottom: 1px solid var(--night-border);
}

html[data-theme="dark"] .doc-article .post-prose,
html[data-theme="dark"] .x-card__content,
html[data-theme="dark"] .embed-shell__note {
  color: var(--night-muted);
}

html[data-theme="dark"] .doc-article .post-prose h1,
html[data-theme="dark"] .doc-article .post-prose h2,
html[data-theme="dark"] .doc-article .post-prose h3,
html[data-theme="dark"] .doc-article .post-prose h4,
html[data-theme="dark"] .doc-article .post-prose strong,
html[data-theme="dark"] .post-section__title {
  color: var(--night-text);
}

html[data-theme="dark"] .doc-article .post-prose h2,
html[data-theme="dark"] .doc-article .post-prose hr,
html[data-theme="dark"] .doc-article .post-prose th,
html[data-theme="dark"] .doc-article .post-prose td,
html[data-theme="dark"] .x-card__footer {
  border-color: var(--night-border);
}

html[data-theme="dark"] .doc-article .post-prose code {
  color: #dff7ff;
  background: #111;
}

html[data-theme="dark"] .doc-article .post-prose tr:hover td,
html[data-theme="dark"] .embed-shell__frame,
html[data-theme="dark"] .embed-shell[data-embed="x"] .embed-shell__frame {
  background: var(--night-surface-raised);
}

html[data-theme="dark"] .pagination--pager {
  color: var(--night-muted);
  background: var(--night-surface);
  border-color: var(--night-border);
}

@media (max-width: 850px) {
  .theme-toggle {
    margin-left: auto;
  }
}

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