:root {
  color-scheme: light;
  --text: #111;
  --muted: #6b6b6b;
  --rule: #dedede;
  --surface: #fff;
  --code: #f5f5f5;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.62;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.site-shell {
  display: flex;
  min-height: calc(100svh - 136px);
  flex-direction: column;
}

.site-shell > main {
  flex: 1;
}

.home-page a,
.home-page a:hover,
.home-page a:focus-visible {
  color: inherit;
  text-decoration: none;
}

.home-page a:hover {
  color: #555;
}

::selection {
  background: #d9ebff;
}

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
}

a:hover,
a:focus-visible {
  text-decoration-thickness: 2px;
}

a:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

img {
  max-width: 100%;
  height: auto;
}

.site-shell,
.reader-shell,
.error-shell {
  width: min(100% - 40px, 680px);
  margin: 72px auto 64px;
}

.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--rule);
}

.site-header h1 {
  margin: 0;
  font-size: clamp(24px, 5vw, 32px);
  line-height: 1.15;
  letter-spacing: -0.035em;
}

.site-header h1 a {
  text-decoration: none;
}

.site-header nav {
  display: flex;
  flex: 0 0 auto;
  gap: 18px;
  font-size: 15px;
}

.tab-nav {
  overflow: hidden;
  gap: 0 !important;
  border: 1px solid #d3d3d3;
  border-radius: 7px;
}

.tab-nav button {
  min-height: 34px;
  padding: 5px 12px;
  border: 0;
  border-left: 1px solid #d3d3d3;
  border-radius: 0;
  background: #fff;
  color: var(--text);
  font: inherit;
  line-height: 1;
  cursor: pointer;
}

.tab-nav button:first-child {
  border-left: 0;
}

.tab-nav button:hover {
  background: #f5f5f5;
}

.tab-nav button[aria-selected="true"] {
  background: var(--text);
  color: #fff;
}

.tab-nav button[aria-selected="true"]:hover {
  background: var(--text);
}

.tab-nav button:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 3px;
}

.tab-panel[hidden] {
  display: none;
}

.tab-panel {
  margin-top: 0 !important;
}

main section + section {
  margin-top: 64px;
}

h2 {
  margin: 0 0 28px;
  font-size: 22px;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h3 {
  margin: 4px 0 8px;
  font-size: 20px;
  line-height: 1.32;
  letter-spacing: -0.018em;
}

p {
  margin: 0 0 16px;
}

.intro-section p {
  max-width: 42em;
}

.text-links,
.entry-links {
  font-size: 15px;
}

.entry-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.entry-list > li {
  border-top: 1px solid var(--rule);
}

.entry-list > li:last-child {
  border-bottom: 1px solid var(--rule);
}

.entry-list p {
  margin-bottom: 8px;
}

.entry-meta {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.4;
}

.post-list > li {
  padding: 0;
}

.post-list > li:first-child {
  border-top: 0;
}

.post-row-link {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  align-items: baseline;
  gap: 20px;
  padding: 18px 10px;
  border-radius: 4px;
}

.post-list > li:first-child .post-row-link {
  padding-top: 8px;
}

.post-row-link:hover,
.post-row-link:focus-visible {
  background: #f7f7f7;
  color: var(--text) !important;
}

.post-list h3 {
  margin: 0;
  font-size: 19px;
  font-weight: 600;
}

.project-list > li {
  padding: 20px 0;
}

.project-list > li:first-child {
  padding-top: 8px;
  border-top: 0;
}

.project-list h3 {
  margin: 0 0 8px;
}

.project-list p:last-child {
  margin-bottom: 0;
}

/* About */
.about-hero {
  padding: 8px 0 32px;
  border-bottom: 1px solid var(--rule);
}

.about-kicker,
.about-label {
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.about-name {
  margin: 0 0 18px;
  font-size: clamp(30px, 6vw, 42px);
  line-height: 1.1;
  letter-spacing: -0.04em;
}

.about-name span {
  display: block;
  margin-top: 7px;
  color: var(--muted);
  font-size: 0.43em;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.about-lead {
  max-width: 34em;
  margin: 0;
  font-size: 18px;
  line-height: 1.65;
}

.profile-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
}

.profile-facts > div {
  padding: 20px 0;
  border-bottom: 1px solid var(--rule);
}

.profile-facts > div:nth-child(odd) {
  padding-right: 24px;
}

.profile-facts > div:nth-child(even) {
  padding-left: 24px;
  border-left: 1px solid var(--rule);
}

.profile-facts dt {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.profile-facts dd {
  margin: 0;
  font-weight: 600;
}

.about-block {
  margin-top: 48px;
}

.focus-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
  list-style: none;
}

.focus-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--rule);
}

.focus-number {
  padding-top: 2px;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
}

.focus-list h3 {
  margin: 0 0 5px;
  font-size: 17px;
}

.focus-list p {
  margin: 0;
  color: #333;
}

.principles-block {
  padding: 22px 24px;
  border-left: 3px solid var(--text);
  background: #f7f7f7;
}

.principles-line {
  margin-bottom: 10px;
  font-size: 18px;
  font-weight: 650;
  letter-spacing: -0.015em;
}

.principles-block p:last-child,
.now-block p:last-of-type {
  margin-bottom: 0;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.contact-links a {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  padding: 5px 12px;
  border: 1px solid #cfcfcf;
  border-radius: 6px;
  text-decoration: none;
}

.contact-links a:hover,
.contact-links a:focus-visible {
  border-color: var(--text);
  color: var(--text) !important;
}

footer {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 14px;
}

footer p {
  margin: 0;
}

/* Article reader */
.reader-shell {
  margin-top: 52px;
}

.reader-toolbar {
  margin-bottom: 48px;
  font-size: 15px;
}

.reader-title {
  margin: 0 0 40px;
  font-size: clamp(30px, 6vw, 44px);
  line-height: 1.16;
  letter-spacing: -0.038em;
}

.reader-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
}

/* 404 page compatibility */
.plain-article h1 {
  margin: 0 0 20px;
  font-size: clamp(32px, 7vw, 48px);
  letter-spacing: -0.04em;
}

.button {
  color: inherit;
}

@media (max-width: 620px) {
  .site-shell,
  .reader-shell,
  .error-shell {
    width: min(100% - 32px, 680px);
    margin-top: 40px;
  }

  .site-shell {
    min-height: calc(100svh - 104px);
  }

  .site-header {
    display: block;
    margin-bottom: 32px;
    padding-bottom: 20px;
  }

  .site-header nav {
    margin-top: 14px;
  }

  .tab-nav {
    display: grid !important;
    width: 100%;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .tab-nav button {
    width: 100%;
  }

  .profile-facts {
    grid-template-columns: 1fr;
  }

  .profile-facts > div:nth-child(odd),
  .profile-facts > div:nth-child(even) {
    padding: 16px 0;
    border-left: 0;
  }

  .about-block {
    margin-top: 40px;
  }

  .principles-block {
    padding: 20px;
  }

  main section + section {
    margin-top: 52px;
  }

  .post-row-link {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .reader-title {
    margin-bottom: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

@media print {
  .site-shell,
  .reader-shell,
  .error-shell {
    width: 100%;
    margin: 0;
  }

  .site-header nav,
  .reader-toolbar,
  footer {
    display: none;
  }
}