:root {
  --paper: #f2f6f8;
  --surface: #ffffff;
  --ink: #14202a;
  --muted: #5f707d;
  --line: #cbd7de;
  --line-soft: #dfe7eb;
  --blue: #2457d6;
  --teal: #0d7f80;
  --header: rgb(242 246 248 / 92%);
  --max: 1080px;
  --display: Georgia, "Times New Roman", "Noto Serif CJK SC", serif;
  --body: "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --mono: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
  color-scheme: light;
}

[data-theme="dark"] {
  --paper: #0d141a;
  --surface: #131d25;
  --ink: #e7eef2;
  --muted: #9aacb8;
  --line: #344550;
  --line-soft: #24333d;
  --blue: #78a2ff;
  --teal: #58c6c3;
  --header: rgb(13 20 26 / 92%);
  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 105px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--blue);
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.55rem 0.8rem;
  color: var(--surface);
  background: var(--ink);
  transform: translateY(-180%);
  transition: transform 150ms ease;
}

.skip-link:focus {
  transform: none;
}

.site-header {
  position: sticky;
  z-index: 30;
  top: 0;
  width: 100%;
  border-bottom: 1px solid transparent;
  background: var(--header);
  backdrop-filter: blur(16px);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.site-header.is-scrolled {
  border-color: var(--line);
  box-shadow: 0 6px 18px rgb(16 30 40 / 5%);
}

.header-row,
.site-nav,
.hero,
.section,
.site-footer {
  width: min(calc(100% - 2.5rem), var(--max));
  margin-inline: auto;
}

.header-row {
  display: flex;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.wordmark,
.header-actions,
.site-nav,
.hero-links,
.row-links,
.contact-line {
  display: flex;
  align-items: center;
}

.wordmark {
  gap: 0.7rem;
  text-decoration: none;
}

.wordmark-name {
  display: grid;
  width: 1.9rem;
  height: 1.9rem;
  place-items: center;
  color: var(--surface);
  border-radius: 50%;
  background: var(--ink);
  font: 700 0.67rem/1 var(--mono);
  letter-spacing: -0.07em;
}

.wordmark-meta,
.eyebrow,
.section-label,
.project-name span,
.quick-facts dt {
  color: var(--muted);
  font: 600 0.67rem/1.4 var(--mono);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.header-actions {
  gap: 0.25rem;
}

.language-toggle,
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 34px;
  padding: 0.35rem 0.55rem;
  color: var(--muted);
  border: 0;
  background: transparent;
  font: 650 0.75rem/1 var(--body);
  cursor: pointer;
}

.language-toggle {
  border-right: 1px solid var(--line);
  font-family: var(--mono);
}

.language-toggle:hover,
.theme-toggle:hover {
  color: var(--ink);
}

.theme-dot {
  width: 0.65rem;
  height: 0.65rem;
  border: 1px solid var(--blue);
  border-radius: 50%;
  background: var(--blue);
  box-shadow: inset -3px 0 0 var(--paper);
}

[data-theme="dark"] .theme-dot {
  box-shadow: inset 3px 0 0 var(--paper);
}

.site-nav {
  min-height: 38px;
  gap: 1.6rem;
  border-top: 1px solid var(--line-soft);
}

.site-nav a {
  position: relative;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
  text-decoration: none;
}

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

.site-nav a[aria-current="true"]::before {
  position: absolute;
  top: 50%;
  left: -0.65rem;
  width: 0.3rem;
  height: 0.3rem;
  border-radius: 50%;
  background: var(--blue);
  content: "";
  transform: translateY(-50%);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(250px, 0.55fr);
  min-height: 430px;
  align-items: center;
  gap: clamp(3rem, 9vw, 8rem);
  padding-block: 4.5rem;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--blue);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0.8rem;
  font: 500 clamp(3.35rem, 8vw, 6.6rem)/0.92 var(--display);
  letter-spacing: -0.055em;
}

.hero-lede {
  max-width: 35rem;
  margin-bottom: 1.8rem;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

.hero-links,
.row-links,
.contact-line {
  flex-wrap: wrap;
  gap: 1rem;
}

.hero-links a,
.row-links a,
.contact-line a,
.section-footnote a,
.site-footer a {
  font-size: 0.78rem;
  font-weight: 750;
}

.hero-links .primary-link {
  padding: 0.45rem 0.7rem;
  color: #fff;
  background: var(--blue);
  text-decoration: none;
}

.quick-facts {
  margin: 0;
  border-top: 1px solid var(--line);
}

.quick-facts div {
  display: grid;
  grid-template-columns: 3.8rem 1fr;
  gap: 0.8rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--line);
}

.quick-facts dt,
.quick-facts dd {
  margin: 0;
}

.quick-facts dd {
  font-size: 0.83rem;
  font-weight: 600;
}

.section {
  padding-block: 4.5rem;
  border-top: 1px solid var(--line);
}

.section-header {
  display: grid;
  grid-template-columns: minmax(220px, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(2rem, 7vw, 7rem);
  align-items: end;
  margin-bottom: 2rem;
}

.section-label {
  margin-bottom: 0.4rem;
  color: var(--blue);
}

h2 {
  margin-bottom: 0;
  font: 500 clamp(2rem, 4vw, 3.4rem)/1 var(--display);
  letter-spacing: -0.035em;
}

.section-header > p {
  max-width: 37rem;
  margin-bottom: 0.15rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.project-index,
.research-index {
  border-top: 1px solid var(--ink);
}

.project-row,
.research-row {
  display: grid;
  grid-template-columns: minmax(170px, 0.7fr) minmax(0, 1.45fr) minmax(110px, 0.45fr);
  gap: clamp(1.25rem, 4vw, 3.5rem);
  align-items: center;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}

.project-name h3 {
  margin-bottom: 0.15rem;
  font: 500 1.35rem/1.1 var(--display);
}

.project-row > p,
.research-row p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.83rem;
  line-height: 1.55;
}

.project-row .row-links,
.research-row .row-links {
  justify-content: flex-end;
  gap: 0.8rem;
}

.principle-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  margin-top: 1.5rem;
  padding: 0.7rem 1rem;
  color: var(--muted);
  border: 1px solid var(--line);
  font: 650 0.68rem/1.4 var(--mono);
  text-transform: uppercase;
}

.principle-line span:nth-child(even) {
  color: var(--blue);
}

.activity-panel {
  display: block;
  margin-bottom: 1rem;
  padding: 0.9rem 1rem 0.65rem;
  color: var(--ink);
  border: 1px solid var(--line);
  background: var(--surface);
  text-decoration: none;
  overflow: hidden;
}

.activity-heading {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.45rem;
  color: var(--muted);
  font: 650 0.62rem/1.3 var(--mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.contribution-animation,
.contribution-animation img {
  display: block;
  width: 100%;
  height: auto;
}

.activity-static {
  display: none;
  margin: 0.8rem 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.contribution-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.contribution-item {
  display: flex;
  min-height: 54px;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.7rem 0.8rem;
  color: var(--ink);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}

.contribution-item span {
  overflow: hidden;
  font-size: 0.75rem;
  font-weight: 650;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.contribution-item strong {
  color: var(--blue);
  font: 500 1.25rem/1 var(--display);
}

.section-footnote {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin: 0.8rem 0 0;
  color: var(--muted);
  font-size: 0.7rem;
}

.research-row {
  grid-template-columns: 7rem minmax(0, 1fr) minmax(100px, 0.35fr);
}

.research-row > span {
  color: var(--blue);
  font: 650 0.7rem/1.4 var(--mono);
  text-transform: uppercase;
}

.research-row h3 {
  margin-bottom: 0.25rem;
  font: 500 clamp(1.05rem, 2vw, 1.35rem)/1.25 var(--display);
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(300px, 1.15fr);
  gap: clamp(2.5rem, 7vw, 7rem);
  align-items: start;
}

.about-grid > p {
  color: var(--muted);
  font: 500 clamp(1.1rem, 2.2vw, 1.5rem)/1.5 var(--display);
}

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

.timeline li {
  display: grid;
  grid-template-columns: 4.6rem 1fr;
  gap: 1rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--line);
}

.timeline li > span {
  color: var(--muted);
  font: 600 0.64rem/1.5 var(--mono);
}

.timeline p {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.45;
}

.contact-line {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 2rem;
  padding-block: 1.2rem 2.2rem;
  color: var(--muted);
  border-top: 1px solid var(--ink);
  font: 600 0.64rem/1.4 var(--mono);
}

.site-footer p {
  margin: 0;
}

.button {
  display: inline-flex;
  align-items: center;
  margin-top: 1rem;
  padding: 0.6rem 0.85rem;
  text-decoration: none;
}

.button-primary {
  color: #fff;
  background: var(--blue);
}

@media (max-width: 820px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    gap: 2.5rem;
    padding-block: 3.5rem;
  }

  .quick-facts {
    max-width: 34rem;
  }

  .section-header,
  .about-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .project-row {
    grid-template-columns: minmax(150px, 0.65fr) minmax(0, 1.35fr);
  }

  .project-row .row-links {
    grid-column: 2;
    justify-content: flex-start;
  }

  .contribution-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  html {
    scroll-padding-top: 96px;
  }

  .header-row,
  .site-nav,
  .hero,
  .section,
  .site-footer {
    width: min(calc(100% - 1.5rem), var(--max));
  }

  .wordmark-meta,
  .theme-toggle span:last-child {
    display: none;
  }

  .site-nav {
    gap: 1.25rem;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .hero {
    padding-block: 3rem;
  }

  h1 {
    font-size: clamp(3.15rem, 19vw, 5rem);
  }

  .section {
    padding-block: 3.25rem;
  }

  .section-header {
    margin-bottom: 1.5rem;
  }

  .project-row,
  .research-row {
    grid-template-columns: 1fr;
    gap: 0.6rem;
    padding: 1rem 0;
  }

  .project-row .row-links,
  .research-row .row-links {
    grid-column: auto;
    justify-content: flex-start;
  }

  .principle-line {
    justify-content: flex-start;
  }

  .contribution-grid {
    grid-template-columns: 1fr;
  }

  .activity-panel {
    padding: 0.7rem;
  }

  .section-footnote {
    display: grid;
  }

  .site-footer {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

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

  .contribution-animation {
    display: none;
  }

  .activity-static {
    display: block;
  }
}

@media print {
  .site-header,
  .hero-links,
  .activity-panel,
  .site-footer {
    display: none;
  }

  body {
    color: #111;
    background: #fff;
  }

  .hero,
  .section {
    width: 100%;
    padding-block: 1.5rem;
  }
}