:root {
  --color-white: #ffffff;
  --color-offwhite: #fefefe;
  --color-surface: #f6f6f6;
  --color-muted: #757575;
  --color-ink: #000000;

  --color-award-best-bg: #fcf3f3;
  --color-award-best-text: #D80000;
  --color-award-honor-bg: #ecf3fc;
  --color-award-honor-text: #002bd8;
  --color-level-ug-bg: #daf8de;
  --color-level-ug-text: #65c369;

  --color-link: #002bd8;
  --color-link-hover: #001b88;

  --bg-page: var(--color-offwhite);
  --text-primary: var(--color-ink);
  --text-secondary: var(--color-muted);
  --border-hairline: var(--color-surface);

  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Segoe UI", Helvetica, Arial, sans-serif;

  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;

  --fs-nav: 0.9375rem;
  --fs-wordmark: 1rem;
  --fs-display: clamp(1.75rem, 1.55rem + 0.9vw, 2rem);
  --fs-lead: 1.0625rem;
  --fs-body: 1rem;
  --fs-meta: 0.9375rem;

  --tracking-tight: -0.01em;
  --tracking-tighter: -0.02em;
  --tracking-wide: 0.02em;
  --leading-normal: 1.5;
  --leading-relaxed: 1.7;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;

  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-pill: 999px;

  --topbar-height: 56px;
  --content-max: 940px;
  --content-pad: var(--space-5);

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast: 160ms;
  --dur-base: 240ms;
  --dur-slow: 400ms;

  --shadow-bar: 0 1px 0 rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.04);

  --color-nav-border: rgba(0, 0, 0, 0.06);
  --color-edge-highlight: rgba(255, 255, 255, 0.7);
  --shadow-glass-edge: inset 0 1px 0 var(--color-edge-highlight);
  --blur-glass: saturate(180%) blur(20px);
  --gradient-nav-surface: radial-gradient(
      140% 90% at 50% -10%,
      rgba(255, 255, 255, 0.55),
      rgba(255, 255, 255, 0) 70%
    ),
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.72) 0%,
      rgba(255, 255, 255, 0.5) 100%
    );
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--topbar-height) + var(--space-3));
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--bg-page);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: var(--fw-regular);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-tight);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100%;
  z-index: 1000;
  padding: var(--space-2) var(--space-4);
  background: var(--color-white);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-bar);
  transition: top var(--dur-base) var(--ease);
}
.skip-link:focus {
  top: var(--space-3);
}

:focus-visible {
  outline: 2px solid var(--color-ink);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--content-pad);
}

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 900;
  display: flex;
  justify-content: center;
  padding: var(--space-3) var(--content-pad) 0;
  pointer-events: none;
}

.topbar__inner {
  pointer-events: auto;
  max-width: var(--content-max);
  padding: var(--space-2);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--gradient-nav-surface);
  -webkit-backdrop-filter: var(--blur-glass);
  backdrop-filter: var(--blur-glass);
  border: 1px solid var(--color-nav-border);
  box-shadow: var(--shadow-glass-edge);
  transition: box-shadow var(--dur-base) var(--ease),
    border-color var(--dur-base) var(--ease);
}

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .topbar__inner {
    background: rgba(255, 255, 255, 0.92);
  }
}

.topbar[data-scrolled="true"] .topbar__inner {
  border-color: rgba(0, 0, 0, 0.08);
  box-shadow: var(--shadow-glass-edge), var(--shadow-bar);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  font-size: var(--fs-nav);
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-tight);
  white-space: nowrap;
  color: var(--text-secondary);
  transition: color var(--dur-fast) var(--ease),
    background-color var(--dur-fast) var(--ease),
    box-shadow var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease);
}

.nav-link__icon {
  flex: 0 0 auto;
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link.is-active {
  color: var(--text-primary);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-glass-edge);
  transform: translateY(-1px);
}

.nav-link:active {
  transform: translateY(0);
}

.hero {
  display: flex;
  align-items: flex-start;
  gap: var(--space-6);
  margin-top: calc(var(--topbar-height) + var(--space-6));
  margin-bottom: var(--space-8);
  padding: var(--space-6);
  border: 1px solid var(--color-nav-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-glass-edge);
}

.hero__aside {
  flex: 0 0 176px;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.hero__photo {
  flex: 0 0 auto;
  width: 100%;
  aspect-ratio: 27 / 40;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
}
.hero__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
  display: block;
}

.hero__interests {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  text-align: center;
}
.hero__interests-heading {
  margin: 0;
  font-size: 0.6875rem;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
}
.hero__interests-list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}
.hero__interests-list li {
  padding: 4px 10px;
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-tight);
  max-width: 100%;
}

.hero__body {
  min-width: 0;
}

.hero__name {
  margin: 0;
  font-size: var(--fs-display);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-tighter);
  line-height: 1.1;
  color: var(--text-primary);
}

.hero__title {
  margin: var(--space-2) 0 0;
  font-size: var(--fs-lead);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
}

.hero__meta {
  margin: var(--space-4) 0 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.hero__meta-row {
  display: flex;
  gap: var(--space-2);
  font-size: var(--fs-meta);
}
.hero__meta-row dt {
  flex: 0 0 auto;
  width: 4.5rem;
  color: var(--text-secondary);
}
.hero__meta-row dd {
  margin: 0;
  color: var(--text-primary);
}
.hero__meta-row a {
  color: var(--text-primary);
  transition: opacity var(--dur-fast) var(--ease);
}
.hero__meta-row a:hover {
  opacity: 0.6;
}

.hero__about {
  margin: var(--space-5) 0 0;
  max-width: 60ch;
  font-size: var(--fs-body);
  line-height: var(--leading-relaxed);
  color: var(--text-primary);
  text-align: left;
}
.hero__about a {
  color: var(--color-link);
  transition: color var(--dur-fast) var(--ease);
}
.hero__about a:hover,
.hero__about a:focus-visible {
  color: var(--color-link-hover);
}
.hero__about cite {
  font-style: italic;
}

@media (max-width: 720px) {
  .hero {
    flex-direction: column;
    align-items: center;
    gap: var(--space-5);
    margin-top: calc(var(--topbar-height) + var(--space-5));
    padding: var(--space-5);
  }
  .hero__aside {
    flex-basis: 132px;
    width: 132px;
  }
  .hero__body {
    text-align: center;
  }
  .hero__meta {
    align-items: center;
  }
  .hero__meta-row {
    justify-content: center;
  }
  .hero__about {
    text-align: center;
    margin-inline: auto;
  }
}

.section-heading {
  margin: 0 0 var(--space-6);
  text-align: center;
  font-size: 1.5rem;
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-tighter);
  color: var(--text-primary);
}

.research {
  padding-bottom: var(--space-8);
}

.paper-list {
  display: flex;
  flex-direction: column;
}

.paper {
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
  padding: var(--space-5) 0;
  border-top: 1px solid var(--border-hairline);
}
.paper:last-child {
  border-bottom: 1px solid var(--border-hairline);
}

.paper__media {
  flex: 0 0 auto;
  width: 116px;
  max-height: calc(116px * 40 / 27);
  margin: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: var(--space-2);
  background: transparent;
}
.paper__media img {
  width: 100%;
  min-height: 0;
  object-fit: cover;
  border-radius: var(--radius-md);
  display: block;
}

.paper__body {
  min-width: 0;
}

.paper__title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: var(--fw-semibold);
  line-height: 1.35;
  letter-spacing: var(--tracking-tight);
}
.paper__title a {
  color: var(--text-primary);
  transition: color var(--dur-fast) var(--ease);
}
.paper__title a:hover {
  color: var(--text-secondary);
}

.paper__authors {
  margin: var(--space-3) 0 0;
  font-size: var(--fs-meta);
  line-height: 1.5;
  color: var(--text-secondary);
}
.paper__authors strong {
  font-weight: var(--fw-semibold);
  color: var(--text-primary);
}

.paper__venue {
  margin: 2px 0 0;
  font-size: var(--fs-meta);
  line-height: 1.5;
  color: var(--text-secondary);
}
.paper__venue cite {
  font-style: italic;
  color: var(--text-secondary);
}

.paper__awards {
  margin: var(--space-3) 0 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
}

.award {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-tight);
}
.award__icon {
  flex: 0 0 auto;
  color: currentColor;
}
.award--best {
  background-color: var(--color-award-best-bg);
  color: var(--color-award-best-text);
}
.award--honor {
  background-color: var(--color-award-honor-bg);
  color: var(--color-award-honor-text);
}

.paper__links {
  margin: var(--space-4) 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.paper__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.875rem;
  font-weight: var(--fw-medium);
  color: var(--text-primary);
  background-color: var(--color-surface);
  transition: color var(--dur-fast) var(--ease),
    background-color var(--dur-fast) var(--ease);
}
.paper__link:hover,
.paper__link:focus-visible {
  color: var(--color-white);
  background-color: var(--color-ink);
}
.paper__link-icon {
  flex: 0 0 auto;
}

.paper__links li:has(.paper__cite) {
  order: 1;
}

@media (max-width: 720px) {
  .paper {
    gap: var(--space-4);
  }
}

.updates {
  padding-bottom: var(--space-8);
}

.timeline {
  display: flex;
  flex-direction: column;
}

.timeline__item {
  display: grid;
  grid-template-columns: 3.5rem 16px 1fr;
  column-gap: var(--space-4);
  padding-bottom: var(--space-5);
}
.timeline__item--hidden {
  display: none;
}
.timeline.is-expanded .timeline__item--hidden {
  display: grid;
}

.timeline__date {
  text-align: right;
  font-size: var(--fs-meta);
  font-weight: var(--fw-medium);
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
  white-space: nowrap;
}

.timeline__marker {
  position: relative;
  display: flex;
  justify-content: center;
}
.timeline__marker::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: calc(-1 * var(--space-5));
  width: 2px;
  transform: translateX(-50%);
  background: var(--border-hairline);
}
.timeline__dot {
  position: relative;
  z-index: 1;
  width: 12px;
  height: 12px;
  margin-top: calc((1rem * var(--leading-relaxed) - 12px) / 2);
  border-radius: var(--radius-pill);
  background: var(--color-white);
  border: 2px solid var(--text-secondary);
}

.timeline__item:last-child .timeline__marker::before {
  display: none;
}
.timeline:not(.is-expanded) .timeline__item:nth-child(3) .timeline__marker::before {
  display: none;
}

.timeline__body {
  font-size: var(--fs-body);
  line-height: var(--leading-relaxed);
  color: var(--text-primary);
}
.timeline__body a {
  color: var(--color-link);
  transition: color var(--dur-fast) var(--ease);
}
.timeline__body a:hover,
.timeline__body a:focus-visible {
  color: var(--color-link-hover);
}

.award-mention {
  font-weight: var(--fw-semibold);
}
.award-mention__icon {
  vertical-align: -2px;
  margin-right: 3px;
}
.award-mention--best {
  color: var(--color-award-best-text);
}
.award-mention--honor {
  color: var(--color-award-honor-text);
}

.updates__toggle-wrap {
  display: flex;
  justify-content: center;
  margin-top: var(--space-2);
}
.updates__toggle {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.875rem;
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  background-color: var(--color-surface);
  transition: color var(--dur-fast) var(--ease),
    background-color var(--dur-fast) var(--ease);
}
.updates__toggle:hover,
.updates__toggle:focus-visible {
  color: var(--color-white);
  background-color: var(--color-ink);
}

@media (max-width: 720px) {
  .timeline__item {
    grid-template-columns: 3rem 16px 1fr;
    column-gap: var(--space-3);
  }
}

.teaching {
  padding-bottom: var(--space-8);
}

.site-footer {
  padding: var(--space-6) var(--content-pad) var(--space-8);
  text-align: center;
}

.site-footer__copy {
  margin: 0;
  color: var(--text-secondary);
  font-size: var(--fs-meta);
  font-weight: var(--fw-regular);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-normal);
}

.course-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: var(--space-6);
  row-gap: var(--space-6);
}

.course {
  display: flex;
  align-items: stretch;
  gap: var(--space-4);
}

.course__meta {
  flex: 0 0 108px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-2);
}

.course__code {
  flex: 1 1 auto;
  min-height: 34px;
  padding: 6px 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  font-size: 1rem;
  font-weight: var(--fw-semibold);
  line-height: 1.15;
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
  white-space: nowrap;
}

.course__level {
  flex: 0 0 auto;
  padding: 4px 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background-color: var(--color-level-ug-bg);
  color: var(--color-level-ug-text);
  font-size: 0.8125rem;
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-tight);
  white-space: nowrap;
}

.course__body {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.course__name {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  margin: 0;
  font-size: var(--fs-body);
  font-weight: var(--fw-medium);
  line-height: 1.4;
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
}

.course__terms {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.course__term {
  padding: 4px 10px;
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-tight);
}

@media (max-width: 720px) {
  .course-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .nav-menu {
    gap: 0;
  }

  .nav-link {
    gap: 0;
    padding: var(--space-2);
  }
  .nav-link > span {
    display: none;
  }
}

.cite-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
}
.cite-modal[hidden] {
  display: none;
}

.cite-modal__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.32);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}

.cite-modal__card {
  position: relative;
  width: 100%;
  max-width: 560px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-white);
  border: 1px solid var(--color-nav-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-glass-edge), var(--shadow-bar);
}

.cite-modal__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.cite-modal__title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
}
.cite-modal__close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  transition: color var(--dur-fast) var(--ease),
    background-color var(--dur-fast) var(--ease);
}
.cite-modal__close:hover,
.cite-modal__close:focus-visible {
  color: var(--color-white);
  background-color: var(--color-ink);
}

.cite-modal__code {
  margin: 0;
  padding: var(--space-4);
  overflow: auto;
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  color: var(--text-primary);
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
  font-size: 0.8125rem;
  line-height: 1.6;
  white-space: pre;
  tab-size: 2;
}

.cite-modal__actions {
  display: flex;
  justify-content: flex-end;
}
.cite-modal__copy {
  border: none;
}