:root {
  --bg: #000000;
  --dot: #1f2937;
  --surface: #171717;
  --surface-soft: #111111;
  --border: #262626;
  --border-strong: #404040;
  --text: #a8a29e;
  --text-strong: #d6d3d1;
  --text-soft: #78716c;
  --accent: #93a4be;
  --page-width: 500px;
  --page-pad: 24px;
  --font-xs: 0.75rem;
  --font-sm: 0.875rem;
  --font-base: 0.95rem;
  --font-lg: 1.125rem;
  --font-xl: 1.45rem;
  --line: 1.55;
  --radius: 8px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --duration: 180ms;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

html {
  scroll-padding-top: 24px;
  scroll-behavior: smooth;
}

body {
  color: var(--text);
  background-color: var(--bg);
  background-image: radial-gradient(circle, var(--dot) 1px, transparent 1px);
  background-size: 16px 16px;
  font-family: "Inter", "Geist", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: var(--font-base);
  font-weight: 300;
  line-height: var(--line);
  letter-spacing: 0;
  overflow-x: hidden;
}

a {
  color: inherit;
}

.page {
  width: 100%;
  max-width: calc(var(--page-width) + (var(--page-pad) * 2));
  margin-inline: auto;
  padding: 60px var(--page-pad) 28px;
}

.article-page {
  max-width: calc(1000px + (var(--page-pad) * 2));
}

.article-page .topbar,
.article-page .footer {
  max-width: 760px;
  margin-inline: auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.site-title {
  color: var(--text-strong);
  font-size: var(--font-base);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 24px;
}

nav a,
.links a {
  color: var(--text);
  font-size: var(--font-sm);
  text-decoration: none;
}

.animated-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  color: var(--text-strong);
  text-decoration: none;
  transition: color 300ms ease;
}

.animated-link::after,
.animated-link::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  transform-origin: left;
  pointer-events: none;
}

.animated-link::after {
  background: var(--border-strong);
  opacity: 0.7;
}

.animated-link::before {
  z-index: 1;
  background: var(--text-strong);
  opacity: 0;
  transform: scaleX(0);
}

.animated-link:hover,
.animated-link:focus-visible,
.animated-link.is-active {
  color: #f5f5f4;
}

.animated-link:hover::before,
.animated-link:focus-visible::before {
  opacity: 1;
  animation: sweep 2s ease-in-out infinite;
}

.animated-link.is-active::before {
  opacity: 1;
  transform: scaleX(1);
}

a:focus-visible {
  outline: 1px solid var(--text-strong);
  outline-offset: 4px;
}

.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;
}

.content {
  margin-top: 18px;
}

.group-block {
  position: relative;
  margin-top: 10px;
  padding-left: 16px;
  border-radius: var(--radius);
  transition: transform var(--duration) var(--ease);
}

.group-block:hover {
  transform: translateX(4px);
}

.group-label,
.single-line {
  margin: 0;
  color: var(--text);
  font-size: var(--font-base);
}

.group-label {
  font-style: italic;
  font-weight: 600;
}

.single-line::before,
.group-label::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  background: var(--text-strong);
  transform: translateY(-50%) rotate(45deg);
  transition: transform 300ms var(--ease);
}

.group-block:hover .single-line::before,
.group-block:hover .group-label::before {
  transform: translateY(-50%) rotate(90deg);
}

.experience-lines,
.project-lines {
  display: grid;
  gap: 4px;
  margin-top: 10px;
  margin-left: 16px;
}

.experience-lines p,
.project-lines p {
  margin: 0;
  color: var(--text);
  font-size: var(--font-base);
  line-height: var(--line);
}

.company-link {
  margin-left: 0.2rem;
}

.link-icon {
  width: 14px;
  height: 14px;
  margin-right: 0.2rem;
  border: 1px solid var(--text-strong);
  border-radius: 3px;
  background: #ffffff;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.75);
  vertical-align: -2px;
}

.blog-content,
.archive-content,
.article {
  margin-top: 18px;
}

.blog-layout {
  display: grid;
  grid-template-columns: 180px minmax(0, 740px);
  gap: 48px;
  align-items: start;
  max-width: 968px;
  margin-inline: auto;
}

.toc {
  position: sticky;
  width: 180px;
  top: 90px;
  margin-top: 18px;
  color: var(--text-soft);
  font-size: 0.8125rem;
  opacity: 0.74;
}

.blog-layout > .article {
  width: 100%;
}

.toc h3 {
  margin: 0 0 10px;
  color: var(--text);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.toc nav {
  display: grid;
  gap: 8px;
}

.toc-link {
  position: relative;
  display: block;
  padding: 0 0 0 13px;
  color: var(--text-soft);
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1.45;
  text-decoration: none;
  opacity: 0.68;
  transition: color var(--duration) var(--ease), transform var(--duration) var(--ease);
}

.toc-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 4px;
  height: 4px;
  border-radius: 999px;
  background: #22c55e;
  opacity: 0;
  transform: translateY(-50%) scale(0.6);
  transition: opacity var(--duration) var(--ease), transform var(--duration) var(--ease);
}

.toc-link:hover,
.toc-link:focus-visible {
  color: var(--text);
  opacity: 1;
  transform: translateX(3px);
}

.toc-link.is-active {
  color: #f5f5f4;
  opacity: 1;
}

.toc-link.is-active::before {
  opacity: 1;
  transform: translateY(-50%) scale(1);
}

.toc-link[data-level="2"] {
  font-weight: 600;
}

.toc-link[data-level="3"] {
  padding-left: 24px;
  font-weight: 400;
}

.toc-link[data-level="3"]::before {
  left: 11px;
}

.page-heading {
  margin: 0;
  color: var(--text-strong);
  font-size: var(--font-xl);
  font-weight: 600;
  line-height: 1.2;
}

.page-subtitle {
  margin: 6px 0 18px;
  color: var(--text);
  font-size: var(--font-sm);
  line-height: var(--line);
}

.post-list {
  display: grid;
  gap: 0;
  padding: 0;
  margin: 0;
  list-style: none;
}

.post-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0;
  border-top: 1px solid var(--border);
}

.post-row:last-child {
  border-bottom: 1px solid var(--border);
}

.post-title {
  font-size: var(--font-base);
  font-weight: 500;
}

.post-summary {
  margin: 4px 0 0;
  color: var(--text-soft);
  font-size: var(--font-sm);
  line-height: 1.45;
}

.post-date {
  color: var(--text-soft);
  font-size: var(--font-sm);
  white-space: nowrap;
}

.books-content {
  margin-top: 18px;
}

.book-list {
  display: grid;
}

.book-entry {
  padding: 24px 0;
  border-top: 1px solid var(--border);
}

.book-entry:first-child {
  padding-top: 0;
  border-top: 0;
}

.book-entry:last-child {
  border-bottom: 1px solid var(--border);
}

.book-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.book-heading h2 {
  margin: 0;
  color: var(--text-strong);
  font-size: var(--font-base);
  font-weight: 600;
  line-height: 1.35;
}

.book-category {
  flex: 0 0 auto;
  color: var(--text-soft);
  font-size: var(--font-xs);
  line-height: 1.35;
}

.book-author,
.book-note {
  margin: 6px 0 0;
  font-size: var(--font-sm);
  line-height: 1.55;
}

.book-author {
  color: var(--text-soft);
}

.book-note {
  color: var(--text);
}

.project-card-list {
  display: grid;
  gap: 16px;
}

.project-card {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color var(--duration) var(--ease), transform var(--duration) var(--ease);
}

.project-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.project-category {
  margin: 0 0 4px;
  color: var(--text-soft);
  font-size: var(--font-xs);
}

.project-info {
  padding: 14px;
  background: var(--surface-soft);
}

.project-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.project-head h2 {
  margin: 0;
  color: var(--text-strong);
  font-size: var(--font-lg);
  font-weight: 600;
  line-height: 1.25;
}

.project-actions {
  display: flex;
  gap: 6px;
}

.icon-link {
  display: inline-grid;
  place-items: center;
  min-width: 24px;
  height: 24px;
  padding: 0 5px;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: var(--font-xs);
  text-decoration: none;
  transition: color var(--duration) var(--ease), border-color var(--duration) var(--ease);
}

.icon-link:hover,
.icon-link:focus-visible {
  color: var(--text-strong);
  border-color: var(--border-strong);
}

.project-info p {
  margin: 8px 0 0;
  color: var(--text);
  font-size: var(--font-sm);
  line-height: 1.5;
}

.project-info .project-category {
  margin-top: 0;
}

.project-info .project-meta {
  color: var(--text-soft);
  font-size: var(--font-xs);
}

strong {
  color: inherit;
  font-weight: 700;
}

.back-link {
  margin-bottom: 18px;
  color: var(--text);
  font-size: var(--font-sm);
}

.article-header {
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.article h1 {
  margin: 0;
  color: var(--text-strong);
  font-size: 1.8rem;
  font-weight: 600;
  line-height: 1.2;
}

.article-header p {
  margin: 8px 0 0;
  color: var(--text);
  font-size: var(--font-base);
  line-height: var(--line);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
  color: var(--text-soft);
  font-size: var(--font-sm);
}

.notice {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin: 0 0 22px;
  background: var(--surface-soft);
  color: var(--text);
  font-size: var(--font-sm);
}

.article section {
  margin-top: 26px;
}

.article h2,
.article h3 {
  color: var(--text-strong);
  font-weight: 600;
  line-height: 1.3;
  scroll-margin-top: 100px;
}

.article h2 {
  margin: 0 0 8px;
  font-size: 1.2rem;
}

.article h3 {
  margin: 18px 0 8px;
  font-size: 1.05rem;
}

.article p,
.article li,
.article td,
.article th {
  color: var(--text);
  font-size: var(--font-base);
  line-height: 1.7;
}

.article p {
  margin: 0 0 12px;
}

.article ul,
.article ol {
  margin: 8px 0 0;
  padding-left: 20px;
}

.article code {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.12rem 0.28rem;
  background: var(--surface-soft);
  color: var(--text-strong);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.86em;
}

.article pre {
  overflow-x: auto;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-soft);
}

.article pre code {
  border: 0;
  padding: 0;
  background: transparent;
}

.article blockquote {
  margin: 16px 0;
  padding-left: 14px;
  border-left: 2px solid var(--border-strong);
  color: var(--text);
  font-style: italic;
}

.article-figure {
  margin: 16px 0;
}

.figure-placeholder {
  display: grid;
  min-height: 180px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(31, 41, 55, 0.35), rgba(23, 23, 23, 0.35)),
    radial-gradient(circle, rgba(214, 211, 209, 0.12) 1px, transparent 1px);
  background-size: auto, 14px 14px;
  color: var(--text-soft);
  font-size: var(--font-sm);
}

figcaption {
  margin-top: 6px;
  color: var(--text-soft);
  font-size: var(--font-xs);
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  min-width: 420px;
  border-collapse: collapse;
  font-size: var(--font-sm);
}

th,
td {
  padding: 8px;
  border: 1px solid var(--border);
  text-align: left;
}

th {
  color: var(--text-strong);
  font-weight: 600;
}

.footer {
  margin-top: 32px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.copyright {
  margin: 10px 0 0;
  color: var(--text-soft);
  font-size: var(--font-sm);
}

@keyframes sweep {
  0% {
    transform: scaleX(0);
    transform-origin: left;
  }
  50% {
    transform: scaleX(1);
    transform-origin: left;
  }
  50.1% {
    transform: scaleX(1);
    transform-origin: right;
  }
  100% {
    transform: scaleX(0);
    transform-origin: right;
  }
}

@media (max-width: 680px) {
  :root {
    --page-pad: 20px;
    --font-base: 1rem;
    --font-sm: 0.92rem;
  }

  .page {
    padding-top: 28px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    justify-content: flex-start;
    gap: 16px;
  }

  .post-row {
    align-items: flex-start;
    flex-direction: column;
    gap: 2px;
  }

  .book-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 2px;
  }
}

@media (max-width: 1180px) {
  .article-page {
    max-width: calc(100% - (var(--page-pad) * 2));
  }

  .blog-layout {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 32px;
    max-width: 100%;
  }

  .toc {
    width: 160px;
    font-size: 0.8125rem;
  }

  .toc-link {
    font-size: 0.8125rem;
  }
}

@media (max-width: 999px) {
  .article-page {
    max-width: calc(var(--page-width) + (var(--page-pad) * 2));
  }

  .blog-layout {
    display: block;
  }

  .toc {
    display: none;
  }
}

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

  .animated-link:hover::before,
  .animated-link:focus-visible::before {
    transform: scaleX(1);
  }

  .group-block:hover,
  .project-card:hover {
    transform: none;
  }
}