:root {
  color-scheme: light;
  --background: #ffffff;
  --surface: #ffffff;
  --surface-subtle: #f7f7f8;
  --text: #1d1d1f;
  --muted: #636366;
  --border: #e5e5ea;
  --link: #0066cc;
  --link-strong: #004c99;
  --focus: #0071e3;
  --content-width: 1040px;
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.58;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.is-scrolled .site-header {
  border-color: rgba(229, 229, 234, 0.92);
  background: rgba(255, 255, 255, 0.86);
}

a {
  color: var(--link);
  text-decoration-thickness: 0.07em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--link-strong);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 55%, transparent);
  outline-offset: 3px;
  border-radius: 8px;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 10;
  transform: translateY(-150%);
  background: var(--text);
  color: #fff;
  padding: 0.65rem 0.9rem;
  border-radius: 10px;
}

.skip-link:focus {
  transform: translateY(0);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  border-bottom: 1px solid transparent;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(18px);
  transition: background 160ms ease, border-color 160ms ease;
}

.nav {
  width: min(var(--content-width), calc(100% - 32px));
  margin: 0 auto;
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav__brand {
  color: var(--text);
  font-weight: 650;
  text-decoration: none;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  margin-left: auto;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav__links::-webkit-scrollbar {
  display: none;
}

.nav__links a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.42rem 0.62rem;
  border-radius: 8px;
  white-space: nowrap;
  font-size: 0.88rem;
}

.nav__links a:hover,
.nav__links a.is-active {
  color: var(--text);
  background: #f2f2f4;
}

.nav__search {
  position: relative;
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.45rem;
  min-width: 38px;
}

.nav__search-toggle {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.nav__search-toggle:hover,
.nav__search.is-open .nav__search-toggle {
  color: var(--text);
  background: #f2f2f4;
}

.nav__search-toggle svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.search-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 20;
  width: min(430px, calc(100vw - 32px));
  max-height: min(560px, calc(100vh - 88px));
  overflow: hidden;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.16);
}

.search-panel__input {
  width: 100%;
  min-height: 42px;
  padding: 0.5rem 0.72rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.88rem;
}

.search-panel__input::placeholder {
  color: #8e8e93;
}

.search-panel__input:focus {
  border-color: color-mix(in srgb, var(--focus) 45%, var(--border));
  outline: 3px solid color-mix(in srgb, var(--focus) 20%, transparent);
}

.search-panel__status {
  margin: 10px 2px 8px;
  color: var(--muted);
  font-size: 0.84rem;
}

.search-results {
  max-height: min(430px, calc(100vh - 190px));
  overflow-y: auto;
  display: grid;
  gap: 6px;
}

.search-result {
  display: grid;
  gap: 0.22rem;
  padding: 0.72rem;
  border: 1px solid transparent;
  border-radius: 8px;
  color: inherit;
  text-decoration: none;
}

.search-result:hover {
  border-color: var(--border);
  background: var(--surface-subtle);
}

.search-result__type {
  color: var(--link);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
}

.search-result strong {
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.28;
}

.search-result__meta,
.search-result__snippet {
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.4;
}

main {
  width: min(var(--content-width), calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  position: relative;
  min-height: auto;
  padding: 70px 0 46px;
  padding-left: 336px;
}

.hero::after,
.section::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 336px;
  height: 1px;
  background: var(--border);
}

.profile-card {
  position: fixed;
  top: 82px;
  left: max(16px, calc((100vw - var(--content-width)) / 2));
  z-index: 4;
  width: 280px;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  pointer-events: auto;
  padding: 0;
  text-align: left;
}

.profile-card__avatar {
  display: block;
  width: 168px;
  height: 168px;
  margin: 0 0 22px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: 2.35rem;
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(1.65rem, 2.5vw, 2.55rem);
  line-height: 1.12;
  letter-spacing: 0;
}

h3 {
  margin: 0 0 0.45rem;
  font-size: 1.08rem;
  line-height: 1.25;
}

.profile-card__meta {
  margin: 0.7rem 0 1.25rem;
  color: var(--muted);
}

.social-links {
  display: grid;
  gap: 0.55rem;
  margin: 1.15rem 0 1.25rem;
}

.social-links a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 550;
}

.social-links a:hover {
  color: var(--link);
}

.social-links svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
  flex: 0 0 auto;
}

.profile-card__actions {
  display: flex;
  justify-content: flex-start;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.button {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.52rem 0.9rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  background: var(--surface-subtle);
}

.button:hover {
  color: var(--text);
  border-color: #a8a8ad;
  background: #f0f0f2;
}

.hero__content {
  max-width: 710px;
  padding-top: 16px;
}

.hero__content h2 {
  margin-bottom: 1rem;
}

.hero__content p:not(.eyebrow) {
  max-width: 66ch;
  color: var(--muted);
  font-size: 1.08rem;
}

.quote-line {
  margin: 1.35rem 0 0;
  padding-left: 1rem;
  border-left: 3px solid var(--border);
  color: var(--text) !important;
  font-size: 1rem !important;
}

.section {
  position: relative;
  margin: 0;
  padding: 46px 0 46px 336px;
  scroll-margin-top: 76px;
}

.section__header {
  margin-bottom: 28px;
}

.section__header h2 {
  font-size: 1.48rem;
  line-height: 1.2;
}

.news-list,
.empty-state {
  margin: 0;
  color: var(--muted);
}

.news-list,
.blog-list,
.publication-list,
.empty-state {
  margin-left: 0;
}

.news-list {
  list-style: disc;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.65rem;
}

.news-list li {
  display: grid;
  grid-template-columns: 128px minmax(0, 1fr);
  gap: 22px;
  padding: 0;
}

.news-list time {
  color: var(--text);
  font-weight: 650;
}

.blog-list {
  display: grid;
  gap: 0;
}

.publication-list {
  display: grid;
  gap: 0;
}

.site-search__empty {
  margin-bottom: 0.8rem;
}

.blog-card {
  display: block;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  color: inherit;
  text-decoration: none;
}

.blog-card h3 {
  color: var(--text);
  transition: color 140ms ease;
}

.blog-card:hover h3 {
  color: var(--link);
}

.blog-card__meta {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.category-list {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: 0.7rem;
}

.article > .category-list {
  margin: 0 0 0.8rem;
}

.category-list span {
  padding: 0.16rem 0.48rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
}

.site-footer {
  width: min(var(--content-width), calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0 44px 336px;
  color: var(--muted);
  font-size: 0.92rem;
}

.article-shell {
  padding: 44px 0 28px;
}

.article {
  max-width: 860px;
  margin: 0 auto;
  padding: 42px;
  background: var(--surface);
  border: 1px solid rgba(210, 210, 215, 0.72);
  border-radius: var(--radius);
}

.article h1 {
  margin-bottom: 0.65rem;
}

.article__meta {
  margin: 0 0 1rem;
  color: var(--muted);
}

.back-link {
  display: inline-flex;
  margin-bottom: 1.25rem;
  font-weight: 650;
  text-decoration: none;
}

.tag-list {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
  margin: 0 0 1.8rem;
}

.tag-list span {
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  background: #f2f2f4;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
}

.post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 2.4rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--border);
}

.post-nav a,
.post-nav .is-disabled {
  min-height: 84px;
  display: grid;
  align-content: center;
  gap: 0.35rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
}

.post-nav span span,
.post-nav a span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.post-nav strong {
  color: var(--text);
  font-size: 0.98rem;
  line-height: 1.35;
}

.post-nav a:hover {
  border-color: #a8a8ad;
}

.post-nav .is-disabled {
  opacity: 0.52;
}

.article__content {
  color: #242426;
}

.article__content h2,
.article__content h3,
.article__content h4 {
  margin-top: 2.1rem;
}

.article__content h2 {
  font-size: 1.65rem;
}

.article__content h3 {
  font-size: 1.28rem;
}

.article__content p,
.article__content li {
  color: #3a3a3c;
}

.article__content blockquote {
  margin: 1.4rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 4px solid var(--border);
  color: var(--muted);
}

.math-inline {
  white-space: nowrap;
}

.math-display {
  margin: 1.35rem 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.code-block {
  position: relative;
  margin: 1.4rem 0;
}

.copy-code-button {
  position: absolute;
  top: 0.62rem;
  right: 0.62rem;
  z-index: 1;
  min-height: 30px;
  padding: 0.28rem 0.58rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
  color: #f5f5f7;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 650;
  cursor: pointer;
}

.copy-code-button:hover,
.copy-code-button.is-copied {
  background: rgba(255, 255, 255, 0.18);
}

.article__content pre {
  overflow-x: auto;
  padding: 1rem;
  padding-top: 2.8rem;
  border-radius: 12px;
  background: #1d1d1f;
  color: #f5f5f7;
  font-size: 0.9rem;
  line-height: 1.5;
  margin: 0;
}

.article__content code {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
}

.article__content :not(pre) > code {
  padding: 0.1rem 0.3rem;
  border-radius: 6px;
  background: #eeeeef;
  color: #1d1d1f;
}

.article__content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4rem 0;
  overflow: hidden;
  font-size: 0.95rem;
}

.article__content th,
.article__content td {
  padding: 0.65rem;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.article__content th {
  background: #f2f2f4;
}

.article__content img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
}

@media (max-width: 800px) {
  body {
    font-size: 16px;
  }

  .nav {
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    padding: 0.7rem 0;
  }

  .nav__brand {
    flex: 1 0 100%;
  }

  .nav__links {
    flex: 1 1 0;
    width: auto;
    margin-left: 0;
  }

  .nav__search {
    width: auto;
    flex: 0 0 auto;
  }

  .search-panel {
    right: 0;
    left: auto;
    width: min(430px, calc(100vw - 32px));
  }

  .hero {
    min-height: auto;
    padding: 34px 0 30px;
  }

  .hero::after,
  .section::after {
    left: 0;
  }

  .profile-card {
    position: static;
    width: auto;
    max-height: none;
    overflow: visible;
  }

  .profile-card__avatar {
    width: 144px;
    height: 144px;
  }

  .hero__content p:not(.eyebrow) {
    font-size: 1rem;
  }

  .section {
    padding: 34px 0;
    scroll-margin-top: 118px;
  }

  .site-footer {
    padding-left: 0;
  }

  .section__header {
    margin-bottom: 18px;
  }

  .article-shell {
    padding-top: 24px;
  }

  .article {
    padding: 24px;
  }

  .news-list li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .post-nav {
    grid-template-columns: 1fr;
  }

  .news-list,
  .blog-list,
  .publication-list,
  .empty-state {
    margin-left: 0;
  }
}

@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;
  }
}