:root {
  --paper: #f5f7f4;
  --paper-raised: #fbfcf9;
  --ink: #17201d;
  --ink-soft: #34413c;
  --muted: #5e6b65;
  --muted-light: #65716b;
  --line: #d8dfda;
  --line-strong: #b7c3bc;
  --accent: #245d70;
  --accent-strong: #17495a;
  --accent-wash: #e6eef0;
  --focus: #b66a24;
  --font-sans: Bahnschrift, "Segoe UI Variable Text", "Segoe UI", "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  --font-mono: "Cascadia Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --container: 1160px;
  --gutter: clamp(20px, 4.6vw, 52px);
  --section-space: clamp(58px, 8vw, 96px);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.72;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--accent);
  color: #fff;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 4px;
}

.container {
  width: min(calc(100% - (2 * var(--gutter))), var(--container));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 9px 14px;
  background: var(--ink);
  color: #fff;
  text-decoration: none;
  transform: translateY(-160%);
}

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

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  min-height: 66px;
  background: #f8f9f6;
  border-bottom: 1px solid var(--line);
}

.header-inner {
  min-height: 66px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-width: max-content;
  color: var(--ink);
  text-decoration: none;
}

.brand:hover {
  color: var(--ink);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 2px;
  background: var(--accent);
  color: #fff;
  font-family: Bahnschrift, "Segoe UI", sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-name {
  font-size: 15px;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  align-items: stretch;
  gap: 2px;
  margin-left: auto;
}

.site-nav a {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 66px;
  padding: 0 12px;
  color: var(--muted);
  font-size: 13.5px;
  text-decoration: none;
}

.site-nav a::after {
  content: "";
  position: absolute;
  right: 12px;
  bottom: -1px;
  left: 12px;
  height: 2px;
  background: transparent;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
}

.site-nav a[aria-current="page"]::after {
  background: var(--accent);
}

.header-mail {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  margin-left: 6px;
  padding: 0 12px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  color: var(--ink-soft);
  font-size: 13px;
  text-decoration: none;
}

.header-mail:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.language-switch {
  display: inline-flex;
  align-items: stretch;
  min-height: 34px;
  margin-left: 6px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
}

.language-switch a {
  display: grid;
  place-items: center;
  min-width: 34px;
  padding: 0 8px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1;
  text-decoration: none;
}

.language-switch a + a {
  border-left: 1px solid var(--line-strong);
}

.language-switch a:hover {
  color: var(--accent);
}

.language-switch a[aria-current="page"] {
  background: var(--ink);
  color: #fff;
}

.language-switch a:first-child {
  border-radius: 1px 0 0 1px;
}

.language-switch a:last-child {
  border-radius: 0 1px 1px 0;
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}

.menu-toggle:hover {
  border-color: var(--accent);
}

.menu-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 12px;
  margin: auto;
}

.menu-toggle-bars span {
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: currentColor;
  transition: transform 160ms ease, top 160ms ease, opacity 160ms ease;
}

.menu-toggle-bars span:first-child {
  top: 2px;
}

.menu-toggle-bars span:last-child {
  top: 9px;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-bars span:first-child {
  top: 5px;
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-bars span:last-child {
  top: 5px;
  transform: rotate(-45deg);
}

main {
  overflow: clip;
}

.intro {
  padding: clamp(50px, 8vw, 92px) 0 clamp(48px, 6.5vw, 76px);
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(230px, 0.76fr) minmax(0, 1.7fr);
  gap: clamp(46px, 8vw, 112px);
  align-items: start;
}

.identity-avatar {
  width: clamp(126px, 13vw, 154px);
  height: clamp(126px, 13vw, 154px);
  object-fit: cover;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
}

.identity-name h1 {
  margin: 22px 0 3px;
  font-family: Bahnschrift, "Segoe UI Variable Display", "Segoe UI", "Microsoft YaHei UI", sans-serif;
  font-size: clamp(2rem, 3.7vw, 2.8rem);
  font-weight: 620;
  line-height: 1.06;
  letter-spacing: -0.045em;
}

.identity-alias {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.01em;
}

.identity-role {
  margin: 14px 0 0;
  color: var(--ink-soft);
  font-size: 14.5px;
}

.identity-facts {
  display: grid;
  gap: 14px;
  margin: 30px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.identity-facts div {
  display: grid;
  gap: 2px;
}

.identity-facts dt {
  color: var(--muted);
  font-size: 12px;
}

.identity-facts dd {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.55;
}

.intro-content {
  padding-top: 4px;
}

.intro-lead {
  max-width: 22em;
  margin: 0 0 28px;
  font-size: clamp(1.55rem, 2.9vw, 2.2rem);
  font-weight: 520;
  line-height: 1.46;
  letter-spacing: -0.015em;
}

.intro-copy {
  max-width: 43em;
}

.intro-copy p {
  margin: 0 0 1.05em;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.88;
}

.intro-copy p:last-child {
  margin-bottom: 0;
}

.contact-invitation {
  max-width: 43em;
  margin-top: 30px;
  padding: 24px 0 0;
  border-top: 1px solid var(--line-strong);
}

.contact-invitation > p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15.5px;
  line-height: 1.78;
}

.contact-invitation strong {
  color: var(--ink);
  font-weight: 650;
}

.contact-list {
  display: flex;
  flex-wrap: wrap;
  gap: 9px 28px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13.5px;
}

.contact-list li {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  min-width: 0;
}

.contact-label {
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}

.contact-value {
  overflow-wrap: anywhere;
}

.copy-button {
  padding: 2px 7px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: transparent;
  color: var(--accent);
  font-family: var(--font-sans);
  font-size: 11.5px;
  line-height: 1.5;
  cursor: pointer;
}

.copy-button:hover {
  border-color: var(--accent);
  background: var(--accent-wash);
}

.copy-button[data-copied="true"] {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.page-hero {
  padding: clamp(46px, 7vw, 82px) 0 clamp(30px, 4.5vw, 46px);
  border-bottom: 1px solid var(--line-strong);
}

.page-kicker {
  margin: 0 0 14px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.02em;
}

.page-hero h1 {
  margin: 0;
  font-family: Bahnschrift, "Segoe UI Variable Display", "Segoe UI", "Microsoft YaHei UI", sans-serif;
  font-size: clamp(2rem, 4.4vw, 3rem);
  font-weight: 620;
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.page-lede {
  max-width: 44em;
  margin: 18px 0 0;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.8;
}

.page-meta {
  margin: 16px 0 0;
  color: var(--muted-light);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.65;
}

.page-content {
  padding: var(--section-space) 0;
}

.page-content .container {
  width: min(calc(100% - (2 * var(--gutter))), 920px);
}

.explore {
  padding: var(--section-space) 0;
  border-top: 1px solid var(--line);
}

.explore-heading {
  max-width: 46em;
  margin-bottom: 30px;
}

.explore-heading h2 {
  margin: 0 0 10px;
  font-size: 1.38rem;
  font-weight: 650;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.explore-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.75;
}

.explore-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.explore-grid li {
  border-bottom: 1px solid var(--line);
}

.explore-grid li:nth-child(odd) {
  border-right: 1px solid var(--line);
}

.explore-card {
  display: grid;
  gap: 7px;
  height: 100%;
  padding: 24px 30px 26px 0;
  color: inherit;
  text-decoration: none;
}

.explore-grid li:nth-child(even) .explore-card {
  padding-right: 0;
  padding-left: 30px;
}

.explore-card:hover .explore-title {
  color: var(--accent);
}

.explore-index {
  color: var(--muted-light);
  font-family: var(--font-mono);
  font-size: 11px;
}

.explore-title {
  color: var(--ink);
  font-size: 1.16rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  transition: color 140ms ease;
}

.explore-desc {
  max-width: 30em;
  color: var(--muted);
  font-size: 13.2px;
  line-height: 1.7;
}

.record-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 16px 34px;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.record-summary div {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.record-summary strong {
  font-family: Bahnschrift, "Segoe UI", sans-serif;
  font-size: 26px;
  font-weight: 620;
  letter-spacing: -0.035em;
}

.record-summary span {
  color: var(--muted);
  font-size: 12.5px;
}

.record-summary > p {
  flex: 1 1 260px;
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
}

.contribution-list {
  border-bottom: 1px solid var(--line-strong);
}

.contribution-group {
  border-top: 1px solid var(--line-strong);
}

.contribution-group summary {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  padding: 21px 2px 21px 19px;
  list-style: none;
  cursor: pointer;
  transition: background-color 140ms ease;
}

.contribution-group summary::-webkit-details-marker {
  display: none;
}

.contribution-group summary::marker {
  content: "";
}

.contribution-group summary::before {
  content: "";
  position: absolute;
  top: 17px;
  bottom: 17px;
  left: 0;
  width: 2px;
  background: var(--line-strong);
  transition: background-color 140ms ease;
}

.contribution-group summary:hover {
  background: rgba(36, 93, 112, 0.035);
}

.contribution-group summary:hover::before,
.contribution-group[open] summary::before {
  background: var(--accent);
}

.group-heading {
  display: grid;
  gap: 3px;
}

.group-title {
  color: var(--ink);
  font-size: 17px;
  font-weight: 650;
  line-height: 1.4;
  letter-spacing: -0.012em;
}

.group-repos {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.55;
}

.group-meta {
  display: inline-flex;
  align-items: center;
  gap: 15px;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}

.disclosure {
  position: relative;
  width: 23px;
  height: 23px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
}

.disclosure::before,
.disclosure::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 9px;
  height: 1px;
  background: var(--accent);
  transform: translate(-50%, -50%);
  transition: transform 160ms ease, opacity 160ms ease;
}

.disclosure::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.contribution-group[open] .disclosure::after {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(0deg);
}

.group-body {
  padding: 0 2px 27px 19px;
}

.group-description {
  max-width: 46em;
  margin: 0 0 18px;
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.8;
}

.pr-block + .pr-block {
  margin-top: 22px;
}

.pr-block-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  padding: 7px 0 8px;
  border-bottom: 1px solid var(--line);
}

.pr-block-heading p {
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.pr-block-heading span {
  flex: 0 0 auto;
  color: var(--muted-light);
  font-size: 11px;
}

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

.pr-link {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) 82px;
  gap: 16px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid #e7ebe7;
  color: var(--ink-soft);
  text-decoration: none;
}

.pr-link:hover {
  color: var(--ink);
}

.pr-number {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 11.5px;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 0.2em;
}

.pr-link:hover .pr-number {
  text-decoration-color: currentColor;
}

.pr-title {
  font-size: 13.7px;
  line-height: 1.6;
  overflow-wrap: anywhere;
}

.pr-date {
  color: var(--muted-light);
  font-family: var(--font-mono);
  font-size: 11px;
  text-align: right;
  white-space: nowrap;
}

.selection-note {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
}

.group-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
  margin-top: 16px;
  font-size: 12.5px;
}

.group-footer a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgba(36, 93, 112, 0.35);
}

.project-list {
  border-top: 1px solid var(--line-strong);
}

.project {
  padding: 28px 0 32px;
  border-bottom: 1px solid var(--line);
}

.project-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  margin-bottom: 12px;
}

.project-head h3 {
  margin: 0;
  font-size: 1.36rem;
  font-weight: 650;
  line-height: 1.35;
  letter-spacing: -0.025em;
}

.project-head h3 a {
  color: var(--ink);
  text-decoration: none;
}

.project-head h3 a:hover {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
}

.project-kind {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
}

.project-description {
  max-width: 48em;
  margin: 0 0 11px;
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.82;
}

.project-facts {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.7;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 14px;
  font-size: 13px;
}

.project-preview {
  max-width: 600px;
  margin: 22px 0 0;
}

.project-preview a {
  display: block;
  border: 1px solid var(--line-strong);
  background: var(--paper-raised);
}

.project-preview img {
  width: 100%;
  height: auto;
}

.project-preview figcaption {
  margin-top: 7px;
  color: var(--muted-light);
  font-size: 11.5px;
  line-height: 1.6;
}

.learning-intro {
  max-width: 48em;
  margin: 0 0 26px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.82;
}

.learning-list {
  border-top: 1px solid var(--line-strong);
}

.learning-topic {
  display: grid;
  grid-template-columns: minmax(150px, 0.72fr) minmax(0, 1.8fr);
  gap: 28px;
  padding: 21px 0 23px;
  border-bottom: 1px solid var(--line);
}

.learning-topic h3 {
  margin: 0;
  font-family: Bahnschrift, "Segoe UI", sans-serif;
  font-size: 14.5px;
  font-weight: 620;
  line-height: 1.65;
  letter-spacing: 0.005em;
}

.learning-topic p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13.8px;
  line-height: 1.78;
}

.learning-topic p + p {
  margin-top: 8px;
  color: var(--muted);
}

.learning-note {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.72;
}

.closing-invitation {
  max-width: 48em;
  margin-top: 30px;
  padding-top: 23px;
  border-top: 1px solid var(--line-strong);
}

.closing-invitation p {
  margin: 0 0 14px;
  color: var(--ink-soft);
  font-size: 15.5px;
  line-height: 1.8;
}

.closing-contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 11px 18px;
}

.text-action {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 13px;
  border: 1px solid var(--accent);
  border-radius: 2px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
}

.text-action:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
  color: #fff;
}

.closing-wechat {
  color: var(--muted);
  font-size: 12.5px;
}

.site-footer {
  padding: 24px 0 30px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.7;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 28px;
}

.footer-inner p {
  margin: 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 20px;
}

.footer-links a {
  color: var(--muted);
}

.footer-links a:hover {
  color: var(--accent);
}

.not-found-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.not-found-main {
  flex: 1;
  display: grid;
  place-items: center;
  padding: 48px 0 80px;
}

.not-found-card {
  width: min(100%, 720px);
}

.not-found-code {
  margin: 0 0 12px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 13px;
}

.not-found-card h1 {
  margin: 0 0 18px;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 620;
  letter-spacing: -0.035em;
}

.not-found-card p {
  max-width: 38em;
  margin: 0 0 24px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.8;
}

.not-found-header {
  border-bottom: 1px solid var(--line);
}

.not-found-header .header-inner {
  min-height: 66px;
}

.not-found-footer {
  padding: 22px 0 26px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}