/* Guodong Sun: personal site, Material 3 (Expressive) styling.
   Color roles: material-color-utilities 0.3.0, SchemeTonalSpot, seed #173B58 (CV navy).
   Type: Google Sans Flex (brand) + Roboto Flex (plain). Icons: Material Symbols Rounded. */

/* ---------- Color roles ---------- */
:root {
  color-scheme: light dark;
  --md-primary: #2F628C;
  --md-on-primary: #FFFFFF;
  --md-primary-container: #CEE5FF;
  --md-on-primary-container: #0F4A73;
  --md-secondary: #51606F;
  --md-on-secondary: #FFFFFF;
  --md-secondary-container: #D5E4F7;
  --md-on-secondary-container: #3A4857;
  --md-tertiary: #68587A;
  --md-on-tertiary: #FFFFFF;
  --md-tertiary-container: #EFDBFF;
  --md-on-tertiary-container: #504061;
  --md-surface: #F7F9FF;
  --md-on-surface: #181C20;
  --md-on-surface-variant: #42474E;
  --md-surface-container-lowest: #FFFFFF;
  --md-surface-container-low: #F1F3F9;
  --md-surface-container: #ECEEF3;
  --md-surface-container-high: #E6E8EE;
  --md-surface-container-highest: #E0E2E8;
  --md-outline: #72777F;
  --md-outline-variant: #C2C7CF;
  --md-shadow-rgb: 0 0 0;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --md-primary: #9BCBFB;
    --md-on-primary: #003353;
    --md-primary-container: #0F4A73;
    --md-on-primary-container: #CEE5FF;
    --md-secondary: #B9C8DA;
    --md-on-secondary: #243240;
    --md-secondary-container: #3A4857;
    --md-on-secondary-container: #D5E4F7;
    --md-tertiary: #D3BFE6;
    --md-on-tertiary: #392A49;
    --md-tertiary-container: #504061;
    --md-on-tertiary-container: #EFDBFF;
    --md-surface: #101418;
    --md-on-surface: #E0E2E8;
    --md-on-surface-variant: #C2C7CF;
    --md-surface-container-lowest: #0B0F12;
    --md-surface-container-low: #181C20;
    --md-surface-container: #1C2024;
    --md-surface-container-high: #272A2F;
    --md-surface-container-highest: #323539;
    --md-outline: #8C9198;
    --md-outline-variant: #42474E;
  }
}
:root[data-theme="dark"] {
  --md-primary: #9BCBFB;
  --md-on-primary: #003353;
  --md-primary-container: #0F4A73;
  --md-on-primary-container: #CEE5FF;
  --md-secondary: #B9C8DA;
  --md-on-secondary: #243240;
  --md-secondary-container: #3A4857;
  --md-on-secondary-container: #D5E4F7;
  --md-tertiary: #D3BFE6;
  --md-on-tertiary: #392A49;
  --md-tertiary-container: #504061;
  --md-on-tertiary-container: #EFDBFF;
  --md-surface: #101418;
  --md-on-surface: #E0E2E8;
  --md-on-surface-variant: #C2C7CF;
  --md-surface-container-lowest: #0B0F12;
  --md-surface-container-low: #181C20;
  --md-surface-container: #1C2024;
  --md-surface-container-high: #272A2F;
  --md-surface-container-highest: #323539;
  --md-outline: #8C9198;
  --md-outline-variant: #42474E;
}

/* ---------- Type, shape, elevation, motion ---------- */
:root {
  --brand: "Google Sans Flex", "Google Sans", "Roboto Flex", Roboto, system-ui, sans-serif;
  --plain: "Roboto Flex", Roboto, system-ui, -apple-system, "Segoe UI", Arial, sans-serif;

  --shape-xs: 4px;
  --shape-sm: 8px;
  --shape-md: 12px;
  --shape-lg: 16px;
  --shape-lg-inc: 20px;
  --shape-xl: 28px;
  --shape-xl-inc: 32px;
  --shape-full: 999px;

  --elev-1: 0 1px 2px rgb(var(--md-shadow-rgb) / 0.3), 0 1px 3px 1px rgb(var(--md-shadow-rgb) / 0.15);
  --elev-2: 0 1px 2px rgb(var(--md-shadow-rgb) / 0.3), 0 2px 6px 2px rgb(var(--md-shadow-rgb) / 0.15);

  --ease: cubic-bezier(0.2, 0, 0, 1);
  --ease-spring: cubic-bezier(0.34, 1.4, 0.64, 1);

  --fig-bg: var(--md-surface-container-low);
  --maxw: 880px;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--md-surface);
  color: var(--md-on-surface);
  font-family: var(--plain);
  font-size: 16px;
  line-height: 24px;
  letter-spacing: 0.15px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
p { margin: 0 0 12px; }
strong { font-weight: 600; }
a { color: var(--md-primary); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--md-secondary); outline-offset: 2px; border-radius: var(--shape-sm); }

.msr {
  font-family: "Material Symbols Rounded";
  font-weight: normal;
  font-style: normal;
  font-size: 24px;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  display: inline-block;
  white-space: nowrap;
  direction: ltr;
  font-feature-settings: "liga";
  -webkit-font-feature-settings: "liga";
  font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 24;
  user-select: none;
  flex: none;
}

.skip { position: absolute; left: -9999px; top: 8px; z-index: 20; }
.skip:focus {
  left: 16px;
  background: var(--md-inverse-surface, #2D3135);
  color: #EFF1F6;
  padding: 8px 16px;
  border-radius: var(--shape-full);
}

/* Type roles */
h1, h2, h3, h4 { font-family: var(--brand); color: var(--md-on-surface); margin: 0; font-weight: 450; }
h1 { font-size: 45px; line-height: 52px; letter-spacing: 0; }            /* display medium */
h2 { font-size: 28px; line-height: 36px; letter-spacing: 0; }            /* headline medium */
h3 { font-size: 22px; line-height: 28px; letter-spacing: 0; }            /* title large */
.eyebrow {                                                              /* label large, primary */
  font-family: var(--plain);
  font-size: 14px;
  line-height: 20px;
  font-weight: 600;
  letter-spacing: 0.1px;
  color: var(--md-primary);
  margin: 0 0 6px;
}
.lede {                                                                 /* title large */
  font-family: var(--brand);
  font-size: 22px;
  line-height: 30px;
  font-weight: 400;
  color: var(--md-on-surface-variant);
  max-width: 62ch;
  margin: 12px 0 0;
}
.note { font-size: 14px; line-height: 20px; letter-spacing: 0.25px; color: var(--md-on-surface-variant); margin-top: 12px; }
.muted { color: var(--md-on-surface-variant); }

/* ---------- Scaffold: navigation rail + body pane ---------- */
.rail { background: var(--md-surface); padding: 8px 8px 0; }
.rail-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 8px 4px;
  color: var(--md-on-surface);
  text-decoration: none;
  font-family: var(--brand);
  font-size: 22px;
  line-height: 28px;
  font-weight: 500;
}
.mono {
  width: 40px;
  height: 40px;
  border-radius: var(--shape-md);
  background: var(--md-primary);
  color: var(--md-on-primary);
  display: grid;
  place-items: center;
  font-family: var(--brand);
  font-size: 16px;
  font-weight: 650;
  letter-spacing: 0.5px;
  flex: none;
  transition: border-radius 400ms var(--ease-spring);
}
.rail-brand:hover .mono { border-radius: 20px; }
.rail-items {
  position: relative;
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 6px 0 10px;
}
.rail-items::-webkit-scrollbar { display: none; }
.rail-item {
  flex: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-width: 72px;
  padding: 0 4px;
  color: var(--md-on-surface-variant);
  text-decoration: none;
  font-size: 12px;
  line-height: 16px;
  font-weight: 500;
  letter-spacing: 0.5px;
}
.rail-icon {
  position: relative;
  isolation: isolate;
  display: grid;
  place-items: center;
  width: 56px;
  height: 32px;
  border-radius: var(--shape-full);
  transition: background-color 200ms var(--ease);
}
.rail-icon::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--md-on-surface);
  opacity: 0;
  transition: opacity 150ms linear;
  z-index: -1;
}
.rail-item:hover .rail-icon::after { opacity: 0.08; }
.rail-item:focus-visible { outline: none; }
.rail-item:focus-visible .rail-icon { outline: 3px solid var(--md-secondary); outline-offset: 2px; }
.rail-item[aria-current="page"] { color: var(--md-secondary); font-weight: 700; }
.rail-item[aria-current="page"] .rail-icon { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }
.rail-item[aria-current="page"] .msr { font-variation-settings: "FILL" 1, "wght" 500, "GRAD" 0, "opsz" 24; }

.pane { background: var(--md-surface); }
main { padding: 16px 0 48px; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }

@media (min-width: 600px) {
  .wrap { padding: 0 24px; }
  .rail { padding: 8px 16px 0; }
}

@media (min-width: 840px) {
  body { background: var(--md-surface-container); }
  .scaffold { display: grid; grid-template-columns: 96px minmax(0, 1fr); min-height: 100vh; }
  .rail {
    position: sticky;
    top: 0;
    height: 100vh;
    background: transparent;
    padding: 20px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
  }
  .rail-brand { padding: 0; }
  .rail-brand .mono { width: 48px; height: 48px; border-radius: var(--shape-lg); font-size: 18px; }
  .rail-brand:hover .mono { border-radius: 24px; }
  .brand-name { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  .rail-items { flex-direction: column; overflow: visible; padding: 0; gap: 12px; }
  .rail-item { width: 80px; min-width: 0; padding: 0; }
  .pane {
    margin: 16px 16px 16px 0;
    border-radius: var(--shape-xl);
    min-height: calc(100vh - 32px);
  }
  main { padding: 48px 0 64px; }
  .wrap { padding: 0 40px; }
}

/* ---------- State layers, buttons, chips ---------- */
.btn, .section-head a, .pub-links a, a.card {
  position: relative;
  isolation: isolate;
}
.btn::after, .section-head a::after, .pub-links a::after, a.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: currentColor;
  opacity: 0;
  transition: opacity 150ms linear;
  pointer-events: none;
  z-index: -1;
}
.btn:hover::after, .section-head a:hover::after, .pub-links a:hover::after, a.card:hover::after { opacity: 0.08; }
.btn:active::after, .section-head a:active::after, .pub-links a:active::after, a.card:active::after { opacity: 0.12; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  padding: 0 24px 0 16px;
  border: 0;
  border-radius: var(--shape-full);
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  font-family: var(--plain);
  font-size: 14px;
  line-height: 20px;
  font-weight: 500;
  letter-spacing: 0.1px;
  text-decoration: none;
  transition: border-radius 300ms var(--ease-spring), box-shadow 200ms var(--ease);
}
.btn .msr { font-size: 20px; }
.btn:active { border-radius: var(--shape-md); }
.btn.filled { background: var(--md-primary); color: var(--md-on-primary); }
.btn.filled:hover { box-shadow: var(--elev-1); }
.btn.elevated { background: var(--md-surface-container-low); color: var(--md-primary); box-shadow: var(--elev-1); }
.btn.elevated:hover { box-shadow: var(--elev-2); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 0; }
.chips li, .chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 32px;
  padding: 4px 16px;
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--shape-sm);
  color: var(--md-on-surface-variant);
  font-size: 14px;
  line-height: 20px;
  font-weight: 500;
  letter-spacing: 0.1px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-height: 24px;
  padding: 2px 10px 2px 8px;
  border-radius: var(--shape-sm);
  background: var(--md-tertiary-container);
  color: var(--md-on-tertiary-container);
  font-size: 12px;
  line-height: 16px;
  font-weight: 600;
  letter-spacing: 0.5px;
  vertical-align: middle;
}
.badge .msr { font-size: 16px; font-variation-settings: "FILL" 1, "wght" 500, "GRAD" 0, "opsz" 20; }

/* ---------- Sections ---------- */
.section { margin-top: 48px; }
.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin-bottom: 16px;
}
.section-head h2 { font-size: 24px; line-height: 32px; }   /* headline small */
.section-head a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 40px;
  padding: 0 12px 0 16px;
  margin-right: -12px;
  border-radius: var(--shape-full);
  color: var(--md-primary);
  font-size: 14px;
  line-height: 20px;
  font-weight: 500;
  letter-spacing: 0.1px;
  text-decoration: none;
}
.section-head a .msr { font-size: 18px; }
.page-head h1 { max-width: 20ch; }

/* ---------- Home hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-radius: var(--shape-xl-inc);
  padding: 32px;
}
.hero h1 { color: var(--md-on-primary-container); }
.portrait {
  display: block;
  width: 200px;
  height: 200px;
  object-fit: cover;
  object-position: 50% 22%;
  border-radius: 40%;
  -webkit-clip-path: url(#cookie);
  clip-path: url(#cookie);
  background: var(--md-surface-container-high);
}
.role {
  font-family: var(--brand);
  font-size: 22px;
  line-height: 28px;
  font-weight: 400;
  margin: 8px 0 16px;
}
.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 32px;
  padding: 4px 16px 4px 8px;
  margin: 0 0 16px;
  border: 1px solid color-mix(in srgb, var(--md-on-primary-container) 35%, transparent);
  border-radius: var(--shape-sm);
  font-size: 14px;
  line-height: 20px;
  font-weight: 500;
  letter-spacing: 0.1px;
}
.status .msr { font-size: 18px; font-variation-settings: "FILL" 1, "wght" 400, "GRAD" 0, "opsz" 20; }
.bio p { max-width: 64ch; }
.links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; margin: 0 0 16px; }
.stat { background: var(--md-surface-container-low); border-radius: var(--shape-lg-inc); padding: 16px 20px 18px; }
.stat .num {
  display: block;
  font-family: var(--brand);
  font-size: 36px;
  line-height: 44px;
  font-weight: 450;
  color: var(--md-primary);
}
.stat .lbl { display: block; font-size: 14px; line-height: 20px; letter-spacing: 0.25px; color: var(--md-on-surface-variant); margin-top: 2px; }

/* ---------- Cards ---------- */
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.card {
  display: block;
  background: var(--md-surface-container-low);
  border-radius: 24px;
  padding: 24px;
  color: var(--md-on-surface);
  text-decoration: none;
  transition: border-radius 300ms var(--ease);
}
a.card:hover { border-radius: var(--shape-xl-inc); }
.card h3 { margin: 4px 0 8px; }
.card p { margin: 0; font-size: 15px; line-height: 22px; color: var(--md-on-surface-variant); }
.card .eyebrow { margin: 0; }
.card .more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  color: var(--md-primary);
  font-size: 14px;
  line-height: 20px;
  font-weight: 500;
  letter-spacing: 0.1px;
}
.card .more .msr { font-size: 18px; transition: transform 300ms var(--ease-spring); }
a.card:hover .more .msr { transform: translateX(4px); }
.card .refs { margin-top: 12px; font-size: 13px; line-height: 18px; letter-spacing: 0.3px; color: var(--md-on-surface-variant); }

/* ---------- Interactive labs (links to the web apps) ---------- */
.labs {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  border-radius: var(--shape-xl-inc);
  padding: 24px;
}
.labs .section-head { margin-bottom: 4px; }
.labs .section-head h2 { color: var(--md-on-secondary-container); }
.labs-intro { margin: 0 0 20px; max-width: 64ch; font-size: 15px; line-height: 22px; }
.apps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
a.app {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  background: var(--md-surface-container-lowest);
  color: var(--md-on-surface);
  border-radius: 24px;
  text-decoration: none;
  transition: border-radius 300ms var(--ease), box-shadow 200ms var(--ease);
}
a.app::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: currentColor;
  opacity: 0;
  transition: opacity 150ms linear;
  pointer-events: none;
  z-index: -1;
}
a.app:hover { border-radius: var(--shape-xl-inc); box-shadow: var(--elev-1); }
a.app:hover::after { opacity: 0.08; }
a.app:active::after { opacity: 0.12; }
.app-top { display: flex; align-items: center; gap: 16px; }
.app-icon { flex: none; width: 56px; height: 56px; transition: transform 400ms var(--ease-spring); }
a.app:hover .app-icon { transform: rotate(-6deg) scale(1.06); }
.app-id { display: flex; flex-direction: column; min-width: 0; }
.app-id h3 { margin: 0; }
.app-host { font-size: 13px; line-height: 18px; letter-spacing: 0.3px; color: var(--md-on-surface-variant); overflow-wrap: anywhere; }
.app-desc { font-size: 15px; line-height: 22px; color: var(--md-on-surface-variant); }
.app-ai {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  gap: 6px;
  min-height: 28px;
  padding: 2px 12px 2px 8px;
  border-radius: var(--shape-sm);
  background: var(--md-tertiary-container);
  color: var(--md-on-tertiary-container);
  font-size: 13px;
  line-height: 18px;
  font-weight: 600;
  letter-spacing: 0.3px;
}
.app-ai .msr { font-size: 18px; font-variation-settings: "FILL" 1, "wght" 500, "GRAD" 0, "opsz" 20; }
.app-cta {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  gap: 8px;
  height: 40px;
  margin-top: auto;
  padding: 0 16px 0 24px;
  border-radius: var(--shape-full);
  background: var(--md-primary);
  color: var(--md-on-primary);
  font-size: 14px;
  line-height: 20px;
  font-weight: 500;
  letter-spacing: 0.1px;
  transition: border-radius 300ms var(--ease-spring);
}
.app-cta .msr { font-size: 18px; }
a.app:active .app-cta { border-radius: var(--shape-md); }
.lab-link { margin: 16px 0 0; }
.vh {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Expressive segmented lists ---------- */
.dated, .pubs, .contrib { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.dated > li, .pub, .contrib > li {
  background: var(--md-surface-container-low);
  border-radius: var(--shape-xs);
}
.dated > li:first-child, .pub:first-child, .contrib > li:first-child {
  border-top-left-radius: var(--shape-lg-inc);
  border-top-right-radius: var(--shape-lg-inc);
}
.dated > li:last-child, .pub:last-child, .contrib > li:last-child {
  border-bottom-left-radius: var(--shape-lg-inc);
  border-bottom-right-radius: var(--shape-lg-inc);
}

/* Dated items (news, talks, service) */
.dated > li { display: grid; grid-template-columns: 112px minmax(0, 1fr); gap: 16px; padding: 14px 20px; }
.dated time, .dated .when {
  color: var(--md-primary);
  font-size: 14px;
  line-height: 22px;
  font-weight: 500;
  letter-spacing: 0.1px;
  font-variant-numeric: tabular-nums;
}
.dated .t-title { font-family: var(--brand); font-size: 17px; line-height: 24px; font-weight: 500; margin: 0 0 2px; }
.dated .t-meta { margin: 0; font-size: 14px; line-height: 20px; letter-spacing: 0.25px; color: var(--md-on-surface-variant); }

/* Publications */
.pub { display: grid; grid-template-columns: 112px minmax(0, 1fr); gap: 16px; padding: 18px 20px; }
.pub-tag { display: flex; flex-direction: column; align-items: flex-start; gap: 6px; padding-top: 2px; }
.venue {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 10px;
  border-radius: var(--shape-sm);
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  font-size: 12px;
  line-height: 16px;
  font-weight: 600;
  letter-spacing: 0.5px;
  white-space: nowrap;
}
.year { font-size: 12px; line-height: 16px; font-weight: 500; letter-spacing: 0.5px; color: var(--md-on-surface-variant); }
.pub-title { font-family: var(--brand); font-size: 17px; line-height: 24px; font-weight: 500; margin: 0 0 4px; color: var(--md-on-surface); }
.pub-authors { margin: 0; font-size: 14px; line-height: 20px; letter-spacing: 0.25px; color: var(--md-on-surface-variant); }
.pub-authors .me { font-weight: 700; color: var(--md-on-surface); }
.pub-where { margin: 2px 0 0; font-size: 14px; line-height: 20px; letter-spacing: 0.25px; color: var(--md-on-surface-variant); }
.pub-links { display: flex; flex-wrap: wrap; gap: 4px; margin: 8px 0 0 -12px; }
.pub-links a {
  display: inline-flex;
  align-items: center;
  height: 32px;
  padding: 0 12px;
  border-radius: var(--shape-full);
  color: var(--md-primary);
  font-size: 14px;
  line-height: 20px;
  font-weight: 500;
  letter-spacing: 0.1px;
  text-decoration: none;
}
.pub .badge { margin-top: 10px; }

/* Numbered contributions (research) */
.contrib { margin-top: 20px; counter-reset: c; }
.contrib > li { position: relative; padding: 16px 20px 16px 68px; counter-increment: c; }
.contrib > li::before {
  content: counter(c);
  position: absolute;
  left: 20px;
  top: 16px;
  width: 32px;
  height: 32px;
  border-radius: var(--shape-md);
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  font-family: var(--brand);
  font-size: 15px;
  line-height: 32px;
  font-weight: 600;
  text-align: center;
}
.contrib .where { display: block; margin-top: 4px; font-size: 14px; line-height: 20px; letter-spacing: 0.25px; color: var(--md-on-surface-variant); }

/* Label / value rows (skills, funding, reviewing) */
.rows { display: grid; grid-template-columns: 200px minmax(0, 1fr); row-gap: 2px; margin: 0; }
.rows dt, .rows dd { margin: 0; background: var(--md-surface-container-low); padding: 14px 20px; }
.rows dt {
  font-size: 14px;
  line-height: 22px;
  font-weight: 600;
  letter-spacing: 0.1px;
  color: var(--md-on-surface);
  border-radius: var(--shape-xs) 0 0 var(--shape-xs);
}
.rows dd {
  font-size: 15px;
  line-height: 22px;
  color: var(--md-on-surface-variant);
  border-radius: 0 var(--shape-xs) var(--shape-xs) 0;
}
.rows dt:first-of-type { border-top-left-radius: var(--shape-lg-inc); }
.rows dd:first-of-type { border-top-right-radius: var(--shape-lg-inc); }
.rows dt:last-of-type { border-bottom-left-radius: var(--shape-lg-inc); }
.rows dd:last-of-type { border-bottom-right-radius: var(--shape-lg-inc); }

/* ---------- Entries (experience, education, software) ---------- */
.entry {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 20px;
  background: var(--md-surface-container-low);
  border-radius: 24px;
  padding: 24px;
}
.entry + .entry { margin-top: 12px; }
.entry > *, .pub > *, .dated > li > * { min-width: 0; }
.entry-date {
  color: var(--md-primary);
  font-size: 14px;
  line-height: 28px;
  font-weight: 500;
  letter-spacing: 0.1px;
  font-variant-numeric: tabular-nums;
}
.entry h3 { font-size: 20px; line-height: 28px; }
.entry-org { margin: 2px 0 0; color: var(--md-on-surface-variant); font-size: 15px; line-height: 22px; }
.entry-org a { overflow-wrap: anywhere; }
.entry ul { margin: 12px 0 0; padding-left: 20px; font-size: 15px; line-height: 22px; }
.entry li { margin: 4px 0; }
.entry li::marker { color: var(--md-primary); }
.entry .tags { margin: 12px 0 0; font-size: 13px; line-height: 18px; letter-spacing: 0.3px; color: var(--md-on-surface-variant); }
.kv { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 4px 16px; margin: 12px 0 0; font-size: 14px; line-height: 20px; letter-spacing: 0.25px; }
.kv dt { color: var(--md-on-surface-variant); font-weight: 500; }
.kv dd { margin: 0; color: var(--md-on-surface); }
.nested {
  margin-top: 16px;
  padding: 16px 20px;
  background: var(--md-surface-container-high);
  border-radius: var(--shape-lg);
}
.nested h4 { margin: 0 0 8px; font-family: var(--plain); font-size: 14px; line-height: 20px; font-weight: 600; letter-spacing: 0.1px; color: var(--md-primary); }
.nested ul { margin: 0; padding-left: 18px; font-size: 14px; line-height: 20px; }

/* ---------- Callout ---------- */
.callout {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  border-radius: 24px;
  padding: 24px;
  margin: 16px 0 0;
}
.callout p:last-child { margin-bottom: 0; }

/* ---------- Research themes & figures ---------- */
.theme { margin-top: 56px; }
.theme:first-of-type { margin-top: 40px; }
.theme h2 { margin-bottom: 12px; }
.theme > p { max-width: 70ch; }

figure.fig {
  margin: 20px 0 8px;
  background: var(--fig-bg);
  border-radius: 24px;
  padding: 20px;
}
figure.fig svg.plot { display: block; width: 100%; height: auto; }
figure.fig figcaption { font-size: 14px; line-height: 20px; letter-spacing: 0.25px; color: var(--md-on-surface-variant); margin-top: 12px; }
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  list-style: none;
  padding: 12px 0 0;
  margin: 12px 0 0;
  border-top: 1px solid var(--md-outline-variant);
  font-size: 13px;
  line-height: 18px;
  color: var(--md-on-surface-variant);
}
.legend li { display: inline-flex; align-items: center; gap: 7px; }
.legend svg { width: 20px; height: 14px; flex: none; }

/* SVG figure classes mapped to color roles */
.f-cell { fill: none; stroke: var(--md-outline-variant); stroke-width: 1; }
.f-bs { fill: var(--md-primary); }
.f-ris { stroke: var(--md-tertiary); stroke-width: 3.4; stroke-linecap: round; fill: none; }
.f-user { fill: var(--md-outline); }
.f-direct { stroke: var(--md-primary); stroke-width: 1.8; fill: none; }
.f-refl { stroke: var(--md-tertiary); stroke-width: 1.6; stroke-dasharray: 5 4; fill: none; }
.f-typ { fill: var(--fig-bg); stroke: var(--md-on-surface); stroke-width: 2; }
.f-typ-dot { fill: var(--md-on-surface); }
.f-axis { stroke: var(--md-outline); stroke-width: 1.2; fill: none; }
.f-walk { stroke: var(--md-primary); stroke-width: 2.2; fill: none; stroke-linejoin: round; }
.f-thr { stroke: var(--md-tertiary); stroke-width: 1.6; stroke-dasharray: 7 5; fill: none; }
.f-vline { stroke: var(--md-outline); stroke-width: 1; stroke-dasharray: 2 4; fill: none; }
.f-vline-off { stroke: var(--md-outline-variant); stroke-width: 1; stroke-dasharray: 2 4; fill: none; }
.f-dec { fill: var(--fig-bg); stroke: var(--md-primary); stroke-width: 2; }
.f-dec-ok { fill: var(--md-tertiary); stroke: var(--md-tertiary); stroke-width: 2; }
.f-text { fill: var(--md-on-surface-variant); font: 500 15px var(--plain); }
.f-text-m { fill: var(--md-on-surface-variant); font: 400 14px var(--plain); }
.f-text-off { fill: var(--md-outline); font: 400 15px var(--plain); }
.f-text-w { fill: var(--md-tertiary); font: 600 15px var(--plain); }
.f-halo { paint-order: stroke; stroke: var(--fig-bg); stroke-width: 5px; stroke-linejoin: round; }
figure.fig svg.plot.narrow { max-width: 560px; margin: 0 auto; }

/* ---------- Footer ---------- */
.site-footer { padding: 0 0 32px; color: var(--md-on-surface-variant); font-size: 14px; line-height: 20px; letter-spacing: 0.25px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 4px 24px; justify-content: space-between; }
.site-footer .wrap::before { content: ""; flex-basis: 100%; height: 1px; background: var(--md-outline-variant); margin-bottom: 16px; }
.site-footer a { color: var(--md-on-surface-variant); }

/* ---------- Responsive ---------- */
@media (max-width: 839px) {
  h1 { font-size: 36px; line-height: 44px; }                           /* display small */
  .hero { grid-template-columns: 1fr; gap: 20px; padding: 24px; border-radius: var(--shape-xl); }
  .portrait { width: 148px; height: 148px; }
  .cards { grid-template-columns: 1fr; }
  .apps { grid-template-columns: 1fr; }
  .labs { border-radius: var(--shape-xl); }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 599px) {
  h2 { font-size: 24px; line-height: 32px; }
  .section-head h2 { font-size: 22px; line-height: 28px; }
  .lede { font-size: 18px; line-height: 26px; }
  .role { font-size: 18px; line-height: 24px; }
  .labs { padding: 20px 16px 16px; }
  a.app { padding: 16px; }
  .entry { grid-template-columns: 1fr; gap: 4px; padding: 20px; }
  .rows { grid-template-columns: 1fr; row-gap: 0; }
  .rows dt { border-radius: var(--shape-xs) var(--shape-xs) 0 0; padding-bottom: 0; }
  .rows dd { border-radius: 0 0 var(--shape-xs) var(--shape-xs); padding-top: 4px; margin-bottom: 2px; }
  .rows dt:first-of-type { border-radius: var(--shape-lg-inc) var(--shape-lg-inc) 0 0; }
  .rows dt:last-of-type { border-radius: var(--shape-xs) var(--shape-xs) 0 0; }
  .rows dd:first-of-type { border-radius: 0 0 var(--shape-xs) var(--shape-xs); }
  .rows dd:last-of-type { border-radius: 0 0 var(--shape-lg-inc) var(--shape-lg-inc); margin-bottom: 0; }
  .pub { grid-template-columns: 1fr; gap: 8px; padding: 16px; }
  .pub-tag { flex-direction: row; align-items: center; gap: 10px; }
  .dated > li { grid-template-columns: 1fr; gap: 2px; padding: 14px 16px; }
  .contrib > li { padding: 14px 16px 14px 60px; }
  .contrib > li::before { left: 16px; top: 14px; }
  .kv { grid-template-columns: 1fr; gap: 0; }
  .kv dd { margin-bottom: 6px; }
  figure.fig { padding: 12px; border-radius: 20px; }
  .f-text, .f-text-off, .f-text-w { font-size: 19px; }
  .f-text-m { font-size: 18px; }
}

/* ---------- Print ---------- */
@media print {
  .rail, .skip, .links, .status { display: none; }
  body, .pane { background: #fff; color: #000; }
  .scaffold { display: block; }
  main { padding: 0; }
  a { color: inherit; text-decoration: none; }
  .card, .callout, figure.fig, .nested, .stat, .entry, .hero, .app { break-inside: avoid; }
  .app-cta, .lab-link { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}