@layer reset, tokens, base, layout, components, motion;

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

  html {
    scroll-behavior: smooth;
    scroll-padding-block-start: 2rem;
  }

  body,
  h1,
  h2,
  h3,
  p,
  figure,
  ol,
  ul,
  dl,
  dt,
  dd {
    margin: 0;
  }

  ol,
  ul {
    padding: 0;
    list-style: none;
  }

  img {
    display: block;
    max-inline-size: 100%;
  }

  button {
    font: inherit;
  }

  [hidden] {
    display: none !important;
  }
}

@layer tokens {
  :root {
    color-scheme: light;
    --paper: #fbfaf7;
    --ink: #242722;
    --muted: #6b7067;
    --soft: #e7e3da;
    --soft-strong: #cfc7bb;
    --green: #315c49;
    --rust: #9a5d49;
    --blue: #536f86;
    --berkeley-blue: #003262;
    --berkeley-gold: #fdb515;
    --container: 1040px;
    --gutter: clamp(1.1rem, 3vw, 2.2rem);
    --section-gap: clamp(3rem, 7vw, 5rem);
    --body-font: "Aptos", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    --display-font:
      "Aptos Display", "Segoe UI Light", "Helvetica Neue", Arial, sans-serif;
    --mono-font:
      "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  }
}

@layer base {
  body {
    min-block-size: 100vh;
    color: var(--ink);
    background:
      linear-gradient(180deg, #ffffff 0, var(--paper) 24rem),
      repeating-linear-gradient(
        90deg,
        rgb(36 39 34 / 0.024) 0 1px,
        transparent 1px 84px
      );
    font-family: var(--body-font);
    font-size: clamp(1rem, 0.97rem + 0.16vw, 1.08rem);
    line-height: 1.66;
    text-rendering: optimizeLegibility;
  }

  h1,
  h2,
  h3 {
    color: var(--ink);
    letter-spacing: 0;
    text-wrap: balance;
  }

  h1 {
    max-inline-size: 12ch;
    font-family: var(--display-font);
    font-size: clamp(3rem, 7vw, 5.75rem);
    font-weight: 300;
    line-height: 0.94;
  }

  h2 {
    font-family: var(--display-font);
    font-size: clamp(1.85rem, 3vw, 2.65rem);
    font-weight: 300;
    line-height: 1.04;
  }

  h3 {
    font-size: clamp(1.08rem, 1.5vw, 1.28rem);
    font-weight: 760;
    line-height: 1.2;
  }

  p {
    color: var(--muted);
    text-wrap: pretty;
  }

  a {
    color: inherit;
    text-underline-offset: 0.24em;
  }

  code {
    color: var(--ink);
    font-family: var(--mono-font);
    font-size: 0.92em;
    font-weight: 700;
  }

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

@layer layout {
  .page-shell {
    inline-size: min(var(--container), calc(100% - (var(--gutter) * 2)));
    margin-inline: auto;
    padding-block: clamp(3rem, 6vw, 5.75rem) 4rem;
  }

  .hero {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.25rem);
    align-items: center;
    min-block-size: min(800px, 86svh);
    padding-block-end: clamp(2rem, 4vw, 3.25rem);
  }

  .section {
    padding-block: var(--section-gap);
    border-block-start: 1px solid var(--soft);
  }

  .compact-section {
    padding-block-start: clamp(2rem, 4vw, 3rem);
  }

  .section-heading {
    display: grid;
    gap: 0.55rem;
    max-inline-size: 720px;
    margin-block-end: clamp(1.5rem, 3vw, 2.4rem);
  }

  @media (min-width: 820px) {
    .hero {
      grid-template-columns: minmax(0, 1.08fr) minmax(280px, 0.72fr);
    }

    .work-section .section-heading {
      max-inline-size: 100%;
    }

    .work-section h2 {
      white-space: nowrap;
    }
  }

  @media (min-width: 980px) {
    .hero h1 {
      max-inline-size: none;
      white-space: nowrap;
    }
  }
}

@layer components {
  .skip-link {
    position: fixed;
    inset-block-start: 1rem;
    inset-inline-start: 1rem;
    z-index: 20;
    translate: 0 -150%;
    padding: 0.55rem 0.75rem;
    color: #fff;
    background: var(--green);
    transition: translate 160ms ease;
  }

  .skip-link:focus-visible {
    translate: 0 0;
  }

  .hero-copy {
    display: grid;
    gap: clamp(1rem, 2vw, 1.4rem);
  }

  .eyebrow {
    color: var(--rust);
    font-family: var(--mono-font);
    font-size: 0.76rem;
    font-weight: 750;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .scramble-text {
    display: inline-block;
    min-inline-size: 25ch;
    white-space: nowrap;
  }

  .hero-lede {
    max-inline-size: 62ch;
    color: var(--muted);
    font-size: clamp(1.07rem, 1.4vw, 1.25rem);
  }

  .link-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
  }

  .link-row a {
    position: relative;
    display: inline-block;
    color: var(--green);
    font-weight: 760;
    text-decoration: none;
    transition:
      color 180ms ease,
      letter-spacing 280ms ease-in-out;
  }

  .link-row a::after {
    content: "";
    position: absolute;
    inset-inline: 0;
    inset-block-end: -0.18rem;
    block-size: 1px;
    background: currentColor;
    transform-origin: left;
    transition: scale 180ms ease;
  }

  .link-row a:hover::after,
  .link-row a:focus-visible::after {
    scale: 1.08 1;
  }

  .hero-actions a,
  .contact-links a {
    padding-block: 0.22rem;
    letter-spacing: 0;
  }

  .hero-actions a:hover,
  .hero-actions a:active,
  .hero-actions a:focus-visible,
  .contact-links a:hover,
  .contact-links a:active,
  .contact-links a:focus-visible {
    letter-spacing: 0.16em;
  }

  .hero-actions a::before,
  .hero-actions a::after,
  .contact-links a::before,
  .contact-links a::after {
    inset-inline: auto;
    left: 50%;
    width: 0;
    height: 1px;
    margin: 0;
    background: var(--green);
    transform: translateX(-50%);
    transition: width 350ms ease-in-out;
    scale: 1 1;
  }

  .hero-actions a::before,
  .contact-links a::before {
    content: "";
    position: absolute;
    top: -0.12rem;
  }

  .hero-actions a::after,
  .contact-links a::after {
    bottom: -0.12rem;
  }

  .hero-actions a:hover::before,
  .hero-actions a:hover::after,
  .hero-actions a:active::before,
  .hero-actions a:active::after,
  .hero-actions a:focus-visible::before,
  .hero-actions a:focus-visible::after,
  .contact-links a:hover::before,
  .contact-links a:hover::after,
  .contact-links a:active::before,
  .contact-links a:active::after,
  .contact-links a:focus-visible::before,
  .contact-links a:focus-visible::after {
    width: 85%;
  }

  .skill-strip,
  .tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem 0.7rem;
  }

  .skill-strip li,
  .tag-list li {
    color: color-mix(in srgb, var(--ink) 76%, white);
    font-family: var(--mono-font);
    font-size: 0.74rem;
    font-weight: 650;
  }

  .skill-strip li::before,
  .tag-list li::before {
    content: "/";
    margin-inline-end: 0.35rem;
    color: var(--soft-strong);
  }

  .profile-card {
    display: grid;
    gap: 0.75rem;
  }

  .profile-card__image {
    inline-size: 100%;
    block-size: min(65svh, 560px);
    object-fit: cover;
    object-position: 50% 42%;
    border-radius: 3px;
  }

  .profile-card figcaption {
    max-inline-size: 34ch;
    color: var(--muted);
    font-size: 0.95rem;
    line-height: 1.5;
  }

  .research-page {
    --container: 1040px;
  }

  .research-hero {
    display: grid;
    gap: clamp(1rem, 2vw, 1.35rem);
    min-block-size: auto;
    padding-block: clamp(2rem, 6vw, 5.2rem) clamp(2.2rem, 6vw, 4.5rem);
  }

  .research-hero h1 {
    max-inline-size: 11ch;
    white-space: normal;
  }

  @media (min-width: 980px) {
    .research-hero h1 {
      max-inline-size: none;
    }
  }

  .back-link {
    position: relative;
    width: fit-content;
    color: var(--green);
    font-weight: 760;
    text-decoration: none;
  }

  .back-link::before {
    content: "<";
    margin-inline-end: 0.45rem;
    color: var(--rust);
    font-family: var(--mono-font);
  }

  .back-link::after {
    content: "";
    position: absolute;
    inset-inline: 1.05rem 0;
    inset-block-end: -0.14rem;
    block-size: 1px;
    background: currentColor;
    transform-origin: left;
    transition: scale 180ms ease;
  }

  .back-link:hover::after,
  .back-link:focus-visible::after {
    scale: 1.08 1;
  }

  .scroll-cue {
    --mouse-width: 1.7rem;
    --mouse-height: 2.8rem;
    --mouse-border: 3px;
    --trackball-size: 0.38rem;
    --trackball-travel: 0.72rem;
    --scroll-color: var(--green);
    --scroll-fade: color-mix(in srgb, var(--green) 42%, var(--muted));
    position: absolute;
    inset-inline-start: 50%;
    inset-block-end: clamp(1rem, 1vh, 1rem);
    grid-column: 1 / -1;
    justify-self: center;
    display: grid;
    justify-items: center;
    gap: 0.75rem;
    width: fit-content;
    margin: 0;
    color: var(--green);
    text-decoration: none;
    opacity: 0.72;
    transform: translateX(-50%);
    transition:
      opacity 220ms ease,
      transform 220ms ease,
      visibility 220ms ease;
  }

  .scroll-cue:hover,
  .scroll-cue:focus-visible {
    opacity: 1;
    transform: translateX(-50%) translateY(2px);
  }

  .has-scrolled .scroll-cue {
    display: none;
  }

  .scroll-mouse {
    position: relative;
    width: var(--mouse-width);
    height: var(--mouse-height);
    border-radius: 999px;
    background: color-mix(in srgb, currentColor 28%, var(--paper))
      linear-gradient(
        transparent 0%,
        transparent 50%,
        currentColor 50%,
        currentColor 100%
      );
    background-size: 100% 200%;
    animation:
      mouse-color-slide 5s linear infinite,
      mouse-nudge 5s ease-out infinite;
  }

  .scroll-mouse::before,
  .scroll-mouse::after {
    content: "";
    position: absolute;
    inset: 0;
    margin: auto;
  }

  .scroll-mouse::before {
    width: calc(var(--mouse-width) - var(--mouse-border));
    height: calc(var(--mouse-height) - var(--mouse-border));
    border-radius: inherit;
    background: var(--paper);
  }

  .scroll-mouse::after {
    width: var(--trackball-size);
    height: var(--trackball-size);
    border-radius: 50%;
    background: currentColor;
    animation: trackball-slide 5s linear infinite;
  }

  .scroll-label {
    color: var(--scroll-color);
    font-family: var(--mono-font);
    font-size: 0.66rem;
    font-weight: 750;
    letter-spacing: 0.42em;
    line-height: 1;
    text-indent: 0.42em;
    text-transform: uppercase;
    animation:
      scroll-text-color 5s ease-out infinite,
      scroll-text-nudge 5s ease-out infinite;
  }

  @media (max-width: 1023px) {
    .scroll-cue {
      display: none;
    }
  }

  @keyframes mouse-color-slide {
    0% {
      background-position: 0% 100%;
    }

    20% {
      background-position: 0% 0%;
    }

    21% {
      background-color: color-mix(in srgb, currentColor 28%, var(--paper));
    }

    29.99% {
      background-color: currentColor;
      background-position: 0% 0%;
    }

    30% {
      background-color: color-mix(in srgb, currentColor 28%, var(--paper));
      background-position: 0% 100%;
    }

    50% {
      background-position: 0% 0%;
    }

    51% {
      background-color: color-mix(in srgb, currentColor 28%, var(--paper));
    }

    59% {
      background-color: currentColor;
      background-position: 0% 0%;
    }

    60% {
      background-color: color-mix(in srgb, currentColor 28%, var(--paper));
      background-position: 0% 100%;
    }

    80% {
      background-position: 0% 0%;
    }

    81% {
      background-color: color-mix(in srgb, currentColor 28%, var(--paper));
    }

    90%,
    100% {
      background-color: currentColor;
    }
  }

  @keyframes trackball-slide {
    0% {
      opacity: 1;
      transform: scale(1) translateY(calc(var(--trackball-travel) * -1));
    }

    6% {
      opacity: 1;
      transform: scale(0.9) translateY(calc(var(--trackball-travel) / 4));
    }

    14% {
      opacity: 0;
      transform: scale(0.4) translateY(calc(var(--trackball-travel) * 2));
    }

    15%,
    19% {
      opacity: 0;
      transform: scale(0.4) translateY(calc(var(--trackball-travel) * -1));
    }

    28%,
    29.99%,
    30% {
      opacity: 1;
      transform: scale(1) translateY(calc(var(--trackball-travel) * -1));
    }

    36% {
      opacity: 1;
      transform: scale(0.9) translateY(calc(var(--trackball-travel) / 4));
    }

    44% {
      opacity: 0;
      transform: scale(0.4) translateY(calc(var(--trackball-travel) * 2));
    }

    45%,
    49% {
      opacity: 0;
      transform: scale(0.4) translateY(calc(var(--trackball-travel) * -1));
    }

    58%,
    59.99%,
    60% {
      opacity: 1;
      transform: scale(1) translateY(calc(var(--trackball-travel) * -1));
    }

    66% {
      opacity: 1;
      transform: scale(0.9) translateY(calc(var(--trackball-travel) / 4));
    }

    74% {
      opacity: 0;
      transform: scale(0.4) translateY(calc(var(--trackball-travel) * 2));
    }

    75%,
    79% {
      opacity: 0;
      transform: scale(0.4) translateY(calc(var(--trackball-travel) * -1));
    }

    88%,
    100% {
      opacity: 1;
      transform: scale(1) translateY(calc(var(--trackball-travel) * -1));
    }
  }

  @keyframes mouse-nudge {
    0%,
    30%,
    60%,
    90% {
      transform: translateY(0);
    }

    20%,
    50%,
    80% {
      transform: translateY(0.35rem);
    }
  }

  @keyframes scroll-text-nudge {
    0%,
    30%,
    60%,
    90% {
      transform: translateY(0);
    }

    20%,
    50%,
    80% {
      transform: translateY(0.12rem);
    }
  }

  @keyframes scroll-text-color {
    21%,
    51%,
    81% {
      color: var(--scroll-fade);
    }

    30%,
    60%,
    90% {
      color: var(--scroll-color);
    }
  }

  .snapshot-grid {
    display: grid;
    gap: 0;
    max-inline-size: 900px;
  }

  .research-facts {
    display: grid;
    gap: 0;
    max-inline-size: 940px;
  }

  .research-facts div {
    display: grid;
    grid-template-columns: minmax(7rem, 0.28fr) minmax(0, 1fr);
    gap: 1rem;
    padding-block: 1rem;
    border-block-start: 1px solid var(--soft);
  }

  .research-facts div:last-child {
    border-block-end: 1px solid var(--soft);
  }

  .research-facts dt {
    color: var(--rust);
    font-family: var(--mono-font);
    font-size: 0.76rem;
    font-weight: 750;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .research-facts dd {
    color: var(--ink);
    font-weight: 650;
    line-height: 1.38;
  }

  .research-graph-grid {
    display: grid;
    gap: clamp(2rem, 5vw, 3.4rem);
  }

  .research-graph {
    display: grid;
    gap: 1rem;
    padding-block-end: clamp(1.4rem, 3vw, 2rem);
    border-block-end: 1px solid var(--soft);
  }

  .research-graph h3 {
    margin-block-end: 0.38rem;
  }

  .research-graph p {
    max-inline-size: 66ch;
  }

  .research-canvas {
    display: block;
    inline-size: 100%;
    min-block-size: 15rem;
    aspect-ratio: 23 / 9;
    background: var(--paper);
  }

  .gpr-canvas--embedding {
    aspect-ratio: 16 / 7.5;
  }

  .gpr-canvas--neighborhood {
    aspect-ratio: 1.12 / 1;
    min-block-size: 19rem;
  }

  .research-image-grid {
    display: grid;
    gap: clamp(1.2rem, 3vw, 1.8rem);
  }

  .research-image-grid figure {
    display: grid;
    gap: 0.6rem;
    padding-block-end: 1rem;
    border-block-end: 1px solid var(--soft);
  }

  .research-image-grid img {
    inline-size: 100%;
    border-radius: 3px;
  }

  .research-image-grid figcaption {
    color: var(--muted);
    font-size: 0.92rem;
    font-weight: 620;
    letter-spacing: 0;
    line-height: 1.45;
    text-transform: none;
  }

  .research-visual {
    display: grid;
    gap: 0.7rem;
  }

  .research-visual img {
    inline-size: 100%;
    border-radius: 3px;
  }

  .research-visual figcaption,
  .research-visual p {
    color: var(--muted);
    font-size: 0.92rem;
    font-weight: 620;
    line-height: 1.45;
  }

  .research-demo-grid {
    display: grid;
    gap: clamp(1.4rem, 4vw, 2.4rem);
    align-items: start;
  }

  @media (min-width: 820px) {
    .research-graph {
      grid-template-columns: minmax(14rem, 0.34fr) minmax(0, 1fr);
      align-items: start;
    }

    .research-image-grid {
      grid-template-columns: repeat(3, minmax(0, 1fr));
    }

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

    .research-demo-grid {
      grid-template-columns: minmax(0, 1fr) minmax(20rem, 0.72fr);
    }
  }

  .education-layout {
    display: grid;
    gap: clamp(1.8rem, 4vw, 3rem);
    align-items: start;
  }

  .education-grid {
    display: grid;
    gap: 0;
  }

  .education-grid div,
  .snapshot-grid div {
    display: grid;
    grid-template-columns: minmax(6rem, 0.32fr) minmax(0, 1fr);
    gap: 1rem;
    padding-block: 1rem;
    border-block-start: 1px solid var(--soft);
  }

  .education-grid div:last-child,
  .snapshot-grid div:last-child {
    border-block-end: 1px solid var(--soft);
  }

  .education-grid dt,
  .snapshot-grid dt {
    color: var(--rust);
    font-family: var(--mono-font);
    font-size: 0.76rem;
    font-weight: 750;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .education-grid dd,
  .snapshot-grid dd {
    color: var(--ink);
    font-weight: 650;
    line-height: 1.38;
  }

  .courses-panel {
    display: grid;
    gap: 0.9rem;
  }

  .courses-panel h3 {
    font-family: var(--display-font);
    font-size: clamp(1.3rem, 2vw, 1.7rem);
    font-weight: 300;
  }

  .berkeley-wordmark {
    display: inline-block;
    width: fit-content;
    color: var(--berkeley-gold) !important;
    background: none;
    font-family:
      "Freight Text Pro", "FreightText Pro", "Freight Text", Freight, Georgia,
      serif;
    font-size: 1.08rem;
    font-weight: 850 !important;
    -webkit-text-fill-color: var(--berkeley-gold);
  }

  .course-list {
    columns: 2 16rem;
    column-gap: clamp(1.25rem, 4vw, 3rem);
  }

  .course-list li {
    break-inside: avoid;
    padding-block: 0.46rem;
    border-block-start: 1px solid var(--soft);
    color: color-mix(in srgb, var(--ink) 84%, white);
    font-weight: 620;
    line-height: 1.35;
  }

  @media (min-width: 820px) {
    .education-layout {
      grid-template-columns: minmax(0, 0.78fr) minmax(300px, 1fr);
    }
  }

  .tabs {
    --indicator-left: 0px;
    --indicator-width: 0px;
    position: relative;
    display: inline-flex;
    gap: clamp(1.1rem, 3vw, 2rem);
    margin-block-end: 1.6rem;
    padding-block-end: 0.45rem;
  }

  .tab-indicator {
    position: absolute;
    inset-block-end: 0;
    inset-inline-start: var(--indicator-left);
    inline-size: var(--indicator-width);
    block-size: 2px;
    background: var(--green);
  }

  .tabs.is-ready .tab-indicator {
    transition:
      inset-inline-start 260ms cubic-bezier(0.2, 0.8, 0.2, 1),
      inline-size 260ms cubic-bezier(0.2, 0.8, 0.2, 1);
  }

  .tab-button {
    border: 0;
    padding: 0;
    color: var(--muted);
    background: transparent;
    cursor: pointer;
    font-weight: 760;
  }

  .tab-button.is-active {
    color: var(--green);
  }

  .work-panel {
    opacity: 0;
    translate: 0 -0.85rem;
    transition:
      opacity 520ms ease,
      translate 680ms cubic-bezier(0.2, 0.8, 0.2, 1);
  }

  .work-panel.is-active {
    opacity: 1;
    translate: 0 0;
  }

  .work-panel.is-leaving {
    opacity: 0;
    translate: 0 0.4rem;
    transition:
      opacity 180ms ease,
      translate 180ms ease;
  }

  .work-panel.is-entering .timeline-item {
    animation: tab-fade-down 780ms cubic-bezier(0.18, 0.82, 0.2, 1) both;
  }

  .work-panel.is-entering .timeline-item:nth-child(2) {
    animation-delay: 95ms;
  }

  .work-panel.is-entering .timeline-item:nth-child(3) {
    animation-delay: 190ms;
  }

  .work-panel.is-entering .timeline-item:nth-child(4) {
    animation-delay: 285ms;
  }

  .work-panel.is-entering .timeline-item:nth-child(5) {
    animation-delay: 380ms;
  }

  @keyframes tab-fade-down {
    from {
      opacity: 0;
      transform: translateY(-1.35rem);
    }

    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .timeline {
    --year-rail: clamp(5.8rem, 13vw, 8.5rem);
    position: relative;
    display: grid;
    gap: clamp(1.5rem, 3vw, 2.25rem);
  }

  .timeline::before {
    content: "";
    position: absolute;
    inset-block: 0.4rem 0.35rem;
    inset-inline-start: calc(var(--year-rail) / 2);
    inline-size: 1px;
    background: linear-gradient(
      transparent,
      var(--soft-strong) 8%,
      var(--soft-strong) 92%,
      transparent
    );
  }

  .timeline-item {
    position: relative;
    display: grid;
    grid-template-columns: var(--year-rail) minmax(0, 1fr);
    gap: clamp(1rem, 2.2vw, 1.6rem);
  }

  .timeline-date {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 0.28rem;
    justify-self: center;
    align-self: start;
    justify-items: center;
    min-inline-size: min(100%, 7rem);
    padding-block: 0.16rem 0.32rem;
    color: var(--muted);
    background: var(--paper);
    text-align: center;
  }

  .timeline-year {
    font-family: var(--display-font);
    font-size: clamp(1.9rem, 5.2vw, 3.4rem);
    font-weight: 500;
    line-height: 0.92;
  }

  .timeline-period {
    color: var(--rust);
    font-family: var(--mono-font);
    font-size: clamp(0.62rem, 0.92vw, 0.78rem);
    font-weight: 750;
    letter-spacing: 0.04em;
    line-height: 1.1;
    text-transform: uppercase;
  }

  .timeline-card {
    display: grid;
    gap: 0.52rem;
    padding-block: 0 1.55rem;
    border-block-end: 1px solid var(--soft);
  }

  .item-meta {
    color: var(--rust);
    font-family: var(--mono-font);
    font-size: 0.74rem;
    font-weight: 740;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .timeline-card-period::after {
    content: "/";
    margin-inline: 0.45rem;
    color: var(--soft-strong);
  }

  .year-stack {
    display: grid;
    gap: 0.9rem;
    padding-block-end: 1.55rem;
    border-block-end: 1px solid var(--soft);
  }

  .year-stack-header {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1.2rem;
    align-items: end;
    justify-content: space-between;
  }

  .year-stack-header h3 {
    margin-block-start: 0.18rem;
  }

  .year-stack-preview,
  .year-stack-full {
    overflow: hidden;
    transition:
      max-block-size 620ms cubic-bezier(0.2, 0.8, 0.2, 1),
      opacity 220ms ease,
      translate 420ms cubic-bezier(0.2, 0.8, 0.2, 1);
  }

  .year-stack-preview {
    opacity: 1;
    translate: 0 0;
  }

  .year-stack-full {
    max-block-size: 0;
    opacity: 0;
    translate: 0 -0.4rem;
  }

  .timeline-year-group.is-expanded .year-stack-preview {
    opacity: 0;
    translate: 0 -0.35rem;
  }

  .timeline-year-group.is-expanded .year-stack-full {
    opacity: 1;
    translate: 0 0;
  }

  .year-stack-preview-list,
  .year-stack-items {
    display: grid;
    gap: 0;
  }

  .year-stack-preview-list li {
    display: grid;
    grid-template-columns: minmax(4.5rem, 0.18fr) minmax(0, 0.58fr) minmax(8rem, 0.24fr);
    gap: 0.8rem;
    align-items: baseline;
    padding-block: 0.72rem;
    border-block-start: 1px solid var(--soft);
  }

  .year-stack-preview-list li:last-child {
    border-block-end: 1px solid var(--soft);
  }

  .year-stack-preview-date {
    color: var(--rust);
    font-family: var(--mono-font);
    font-size: 0.7rem;
    font-weight: 750;
    letter-spacing: 0.05em;
    line-height: 1.2;
    text-transform: uppercase;
  }

  .year-stack-preview-title {
    color: var(--ink);
    font-weight: 720;
    line-height: 1.25;
  }

  .year-stack-preview-meta,
  .year-stack-more {
    color: var(--muted);
    font-size: 0.9rem;
    line-height: 1.35;
  }

  .year-stack-more {
    margin-block-start: 0.7rem;
  }

  .year-stack-item .timeline-card {
    padding-block: 1rem 1.25rem;
  }

  .year-stack-item:first-child .timeline-card {
    border-block-start: 1px solid var(--soft);
  }

  .timeline-card p {
    max-inline-size: 68ch;
  }

  .timeline-copy {
    --collapsed-copy-height: clamp(7.8rem, 16vw, 9rem);
    position: relative;
    display: grid;
    gap: 0.52rem;
    max-inline-size: 68ch;
  }

  .timeline-copy.is-collapsible {
    max-block-size: var(--collapsed-copy-height);
    overflow: hidden;
    transition: max-block-size 560ms cubic-bezier(0.2, 0.8, 0.2, 1);
  }

  .timeline-copy.is-collapsible::after {
    content: "";
    position: absolute;
    inset-inline: 0;
    inset-block-end: 0;
    block-size: 2.6rem;
    background: linear-gradient(transparent, var(--paper) 84%);
    pointer-events: none;
    transition: opacity 220ms ease;
  }

  .timeline-card.is-expanded .timeline-copy.is-collapsible::after {
    opacity: 0;
  }

  .timeline-summary {
    color: var(--muted);
  }

  .metric {
    color: var(--ink);
    font-weight: 790;
  }

  .detail-list {
    display: grid;
    gap: 0.34rem;
    padding-inline-start: 1.1rem;
    color: var(--muted);
    list-style: disc;
  }

  .detail-list li::marker {
    color: var(--rust);
  }

  .detail-toggle {
    position: relative;
    justify-self: start;
    width: fit-content;
    border: 0;
    padding: 0.12rem 0;
    color: var(--green);
    background: transparent;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 760;
    letter-spacing: 0;
    line-height: 1.2;
    transition:
      color 180ms ease,
      letter-spacing 280ms ease-in-out;
  }

  .detail-toggle::before,
  .detail-toggle::after {
    content: "";
    position: absolute;
    left: 50%;
    width: 0;
    height: 1px;
    background: currentColor;
    transform: translateX(-50%);
    transition: width 350ms ease-in-out;
  }

  .detail-toggle::before {
    top: -0.1rem;
  }

  .detail-toggle::after {
    bottom: -0.1rem;
  }

  .detail-toggle:hover,
  .detail-toggle:active,
  .detail-toggle:focus-visible {
    letter-spacing: 0.08em;
  }

  .detail-toggle:hover::before,
  .detail-toggle:hover::after,
  .detail-toggle:active::before,
  .detail-toggle:active::after,
  .detail-toggle:focus-visible::before,
  .detail-toggle:focus-visible::after {
    width: 78%;
  }

  .item-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem 0.95rem;
    align-items: center;
    margin-block-start: 0.1rem;
    padding-block: 0.18rem 0.3rem;
    overflow: visible;
  }

  .item-links a {
    position: relative;
    display: inline-block;
    color: var(--green);
    font-size: 0.92rem;
    font-weight: 760;
    line-height: 1.35;
    text-decoration: none;
  }

  .item-links a::after {
    content: "";
    position: absolute;
    inset-inline: 0;
    inset-block-end: -0.1rem;
    block-size: 1px;
    background: currentColor;
    transform-origin: left;
    transition: scale 180ms ease;
  }

  .item-links a:hover::after,
  .item-links a:focus-visible::after {
    scale: 1.08 1;
  }

  @media (hover: hover) and (pointer: fine) {
    .timeline-card--projects .tag-list {
      max-block-size: 0;
      opacity: 0;
      overflow: hidden;
      translate: 0 0.45rem;
      transition:
        max-block-size 420ms cubic-bezier(0.2, 0.8, 0.2, 1),
        opacity 220ms ease,
        translate 360ms cubic-bezier(0.2, 0.8, 0.2, 1);
    }

    .timeline-card--projects:hover .tag-list,
    .timeline-card--projects:focus-within .tag-list {
      max-block-size: 8rem;
      opacity: 1;
      translate: 0 0;
    }
  }

  .contact {
    padding-block-end: 2rem;
  }

  @media (max-width: 680px) {
    .page-shell {
      inline-size: min(100% - 1.5rem, var(--container));
      padding-block-start: 1.3rem;
    }

    .hero {
      min-block-size: auto;
    }

    .profile-card__image {
      block-size: min(72svh, 520px);
    }

    .education-grid div,
    .snapshot-grid div,
    .research-facts div {
      grid-template-columns: 1fr;
      gap: 0.25rem;
    }

    .research-canvas {
      min-block-size: 13rem;
      aspect-ratio: 4 / 3;
    }

    .tabs {
      inline-size: 100%;
      justify-content: flex-start;
    }

    .timeline {
      --year-rail: 4.5rem;
      gap: 1.7rem;
    }

    .timeline-item {
      gap: 0.9rem;
    }

    .year-stack-header {
      display: grid;
      gap: 0.55rem;
    }

    .year-stack-preview-list li {
      grid-template-columns: 1fr;
      gap: 0.18rem;
      padding-block: 0.85rem;
    }

    .year-stack-toggle {
      margin-block-start: 0.15rem;
    }

    .timeline-year {
      font-size: clamp(1.65rem, 10vw, 2.4rem);
    }

    .timeline-period {
      max-inline-size: 4rem;
    }

    .timeline-card--projects .tag-list {
      max-block-size: none;
      opacity: 1;
      overflow: visible;
      translate: 0 0;
    }
  }
}

@layer motion {
  @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;
    }
  }
}