:root {
  --accent: #4a9eff;
  --font-sans: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --header-h: 3.25rem;
  --max-width: 52rem;
  --hero-sidebar-w: 30%;
}

[data-theme="dark"] {
  --bg: #0f1114;
  --bg-elevated: #171a1f;
  --bg-hero-sidebar: #12151a;
  --text: #e8eaed;
  --text-muted: #9aa3ad;
  --border: #2a3038;
  --header-bg: rgba(15, 17, 20, 0.92);
  --code-bg: #1e2228;
  --shadow: rgba(0, 0, 0, 0.35);
}

[data-theme="light"] {
  --bg: #f7f8fa;
  --bg-elevated: #ffffff;
  --bg-hero-sidebar: #e8ecf1;
  --text: #1a1d21;
  --text-muted: #5c6570;
  --border: #d8dee6;
  --header-bg: rgba(247, 248, 250, 0.92);
  --code-bg: #eef1f5;
  --shadow: rgba(0, 0, 0, 0.08);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.15s ease;
}

a:hover {
  opacity: 0.85;
  text-decoration: underline;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
}

.site-header__brand {
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.site-header__brand:hover {
  color: var(--accent);
}

.site-header__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.25rem;
  margin-left: auto;
}

.site-header__nav a {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-decoration: none;
}

.site-header__nav a:hover {
  color: var(--accent);
}

.site-header__nav a[aria-current="page"] {
  color: var(--accent);
  font-weight: 500;
}

.theme-toggle {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
}

.theme-toggle__icon--sun {
  display: none;
}

[data-theme="light"] .theme-toggle__icon--moon {
  display: none;
}

[data-theme="light"] .theme-toggle__icon--sun {
  display: inline;
}

.hero {
  display: grid;
  grid-template-columns: var(--hero-sidebar-w) 1fr;
  min-height: calc(100vh - var(--header-h));
  margin-top: var(--header-h);
  border-bottom: 1px solid var(--border);
}

.hero--home {
  min-height: calc(100vh - var(--header-h));
}

.hero__sidebar {
  position: relative;
  background-color: var(--bg-hero-sidebar);
  background-image: linear-gradient(rgba(255, 255, 255, 0.7), rgba(0, 0, 0, 0.7)),
    url("../images/hero-bg.jpg");
  background-size: cover;
  background-position: center;
}

.hero__sidebar-inner {
  position: sticky;
  top: var(--header-h);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: calc(100vh - var(--header-h));
  padding: 3rem 1rem 2rem;
}

.hero__photo-wrap {
  width: 15rem;
  height: 15rem;
  padding: 0.05rem;
  border-radius: 50%;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.12);
  box-shadow: 0 8px 32px var(--shadow);
}

.hero__photo {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 28%;
  transform: scale(0.9);
  border: 3px solid rgba(255, 255, 255, 0.25);
}

.hero__main {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: 3rem clamp(1.5rem, 5vw, 4rem);
  background: var(--bg-elevated);
}

.hero__name {
  margin: 0 0 0.35rem;
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.hero__role {
  margin: 0 0 1rem;
  font-size: 1.15rem;
  color: var(--accent);
  font-weight: 500;
}

.hero__bio-block {
  margin: 0 0 2rem;
  max-width: 36rem;
  color: var(--text-muted);
}

.hero__bio-block p {
  margin: 0 0 1rem;
}

.hero__bio-block p:last-child {
  margin-bottom: 0;
}

.hero__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
}

.hero__nav a {
  font-size: 0.95rem;
  font-weight: 500;
}

.page-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

.page-main--subpage {
  padding-top: calc(var(--header-h) + 2.5rem);
}

.page-title {
  margin: 0 0 2rem;
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.section--embedded {
  padding: 0;
  border: none;
}

.career-divider {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  margin: 2rem 0;
}

.career-divider__rule {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
}

.career-divider__line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

.career-divider__label {
  flex-shrink: 0;
  max-width: 16rem;
  font-size: 0.8rem;
  font-weight: 500;
  text-align: center;
  color: var(--text-muted);
  line-height: 1.35;
}

.career-divider__note {
  margin: 0 0 0.35rem;
  max-width: 28rem;
  font-size: 0.8rem;
  font-weight: 500;
  font-style: italic;
  text-align: center;
  color: var(--text-muted);
  line-height: 1.35;
}

.section {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
}

.section:first-child {
  border-top: none;
  padding-top: 0;
}

.section__title {
  margin: 0 0 1.5rem;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.section__rss {
  margin: -0.75rem 0 1.25rem;
  font-size: 0.9rem;
}

.section__content p {
  margin-top: 0;
}

.about-sections {
  margin-top: 0.5rem;
}

.about-section {
  border-bottom: 1px solid var(--border);
}

.about-section:first-child {
  border-top: 1px solid var(--border);
}

.about-section__summary {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 1rem 0;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  line-height: 1.45;
  color: var(--text);
}

.about-section__summary::-webkit-details-marker {
  display: none;
}

.about-section__summary::marker {
  content: "";
}

.about-section__chevron {
  flex-shrink: 0;
  width: 1.1rem;
  margin-top: 0.12em;
  font-family: var(--font-mono);
  font-size: 0.95em;
  font-weight: 500;
  color: var(--text-muted);
  transition: transform 0.2s ease, color 0.15s ease;
}

.about-section[open] .about-section__chevron {
  transform: rotate(90deg);
  color: var(--accent);
}

.about-section__summary:hover .about-section__chevron {
  color: var(--accent);
}

.about-section__title {
  flex: 1;
  min-width: 0;
}

.about-section__body {
  padding: 0 0 1.25rem 1.7rem;
}

.about-section__body > :first-child {
  margin-top: 0;
}

.about-section__body > :last-child {
  margin-bottom: 0;
}

.about-page__outro {
  margin-top: 1.75rem;
}

.about-page__outro > :first-child {
  margin-top: 0;
}

.about-cv {
  margin: 1.5rem 0 0;
}

.btn {
  display: inline-block;
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-elevated);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
  opacity: 1;
}

.btn--small {
  padding: 0.4rem 0.85rem;
  font-size: 0.875rem;
}

.cv-page__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.cv-page__back {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.cv-page__frame {
  width: 100%;
  height: min(85vh, 52rem);
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-elevated);
}

.news-page .career-divider {
  margin: 1.6rem 0;
}

.news-filter-status {
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-elevated);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.news-filter-status.is-active {
  display: flex;
}

.news-filter-status__hint {
  font-weight: 400;
}

.news-filter-status__clear {
  flex-shrink: 0;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}

.news-filter-status__clear:hover {
  border-color: var(--accent);
  color: var(--accent);
}

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

.pub-list__item {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}

.pub-list__item:first-child {
  padding-top: 0;
}

.pub-list__item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.pub__title {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.4;
}

.pub__meta {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.pub__tags {
  margin: 0 0 0.35rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.pub__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.15em 0.55em;
  border-radius: 4px;
  border: 1.5px solid var(--accent);
  color: var(--accent);
  background: transparent;
  white-space: nowrap;
}

.pub__tag--award {
  border-color: #c9933a;
  color: #c9933a;
}

[data-theme="dark"] .pub__tag--award {
  border-color: #e0ab55;
  color: #e0ab55;
}

.item-link {
  margin-left: 0.25rem;
  color: var(--accent);
  text-decoration: none;
}

.item-link:hover {
  opacity: 0.85;
  text-decoration: underline;
}

.news-list,
.project-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.news-list__item,
.project-list__item {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}

.news-page .news-list__item {
  padding: 0.85rem 0;
}

.news-page .career-divider + .news-list > .news-list__item:first-child {
  padding-top: 0;
}

.news-list__item:last-child,
.project-list__item:last-child {
  border-bottom: none;
}

/* Shared dated-list layout (news + projects): date | sep | title [| tags] */
.news-item,
.project-item {
  display: grid;
  grid-template-columns: 6.75rem auto minmax(0, 1fr) auto;
  column-gap: 0.65rem;
  align-items: baseline;
}

.project-item {
  grid-template-columns: 6.75rem auto minmax(0, 1fr);
}

.news-item__row,
.project-item__row {
  display: contents;
}

.news-item__date,
.project-item__date {
  font-size: 0.85rem;
  color: var(--text-muted);
  white-space: nowrap;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.news-item__sep,
.project-item__sep {
  color: var(--text-muted);
  opacity: 0.45;
  user-select: none;
}

.news-item__title,
.project-item__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.4;
  min-width: 0;
}

.news-item__title a:not(.item-link) {
  color: var(--accent);
}

.news-item__title:not(:has(a)) {
  font-weight: 400;
}

.project-item__title a:not(.item-link) {
  font-weight: inherit;
}

.news-item__tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem;
}

.news-tag {
  padding: 0.15rem 0.55rem;
  border: none;
  border-radius: 999px;
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 500;
  line-height: 1.4;
  text-transform: lowercase;
  cursor: pointer;
  transition: opacity 0.15s ease, box-shadow 0.15s ease;
}

.news-tag:hover {
  opacity: 0.9;
}

.news-tag[aria-pressed="true"],
.news-tag--active {
  box-shadow: 0 0 0 1px var(--accent);
}

.news-tag[data-tag="paper"] {
  background: rgba(74, 158, 255, 0.18);
  color: #6eb3ff;
}

.news-tag[data-tag="talk"] {
  background: rgba(168, 130, 255, 0.18);
  color: #b99aff;
}

.news-tag[data-tag="conference"] {
  background: rgba(80, 200, 160, 0.18);
  color: #5fd4a8;
}

.news-tag[data-tag="teaching"] {
  background: rgba(255, 180, 80, 0.18);
  color: #ffc266;
}

.news-tag[data-tag="other"] {
  background: rgba(160, 170, 185, 0.2);
  color: var(--text-muted);
}

[data-theme="light"] .news-tag[data-tag="paper"] {
  color: #2a6eb8;
}

[data-theme="light"] .news-tag[data-tag="talk"] {
  color: #6b4fbf;
}

[data-theme="light"] .news-tag[data-tag="conference"] {
  color: #2a8a62;
}

[data-theme="light"] .news-tag[data-tag="teaching"] {
  color: #b87a1a;
}

.news-item__excerpt,
.project-item__desc {
  grid-column: 3 / -1;
  margin: 0.35rem 0 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.news-item__excerpt p,
.project-item__desc p {
  margin: 0 0 0.5rem;
}

.news-item__excerpt p:last-child,
.project-item__desc p:last-child {
  margin-bottom: 0;
}

@media (max-width: 640px) {
  .news-item {
    grid-template-columns: 6.75rem auto minmax(0, 1fr);
    row-gap: 0.35rem;
  }

  .news-item__tags {
    grid-column: 1 / -1;
    justify-content: flex-start;
  }
}

.project-item__image-link {
  grid-column: 1 / -1;
  display: block;
  margin-bottom: 0.75rem;
}

.project-item__image {
  width: 100%;
  max-height: 12rem;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.post-article__hero-image {
  display: block;
  width: 100%;
  max-height: 18rem;
  object-fit: cover;
  margin-bottom: 1.5rem;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.pub__authors strong {
  font-weight: 600;
  color: var(--text);
}

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 2rem 1.5rem;
}

.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.site-footer__social {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
}

.site-footer__social a {
  display: flex;
  color: var(--text-muted);
}

.site-footer__social a:hover {
  color: var(--accent);
}

.site-footer__updated,
.site-footer__copy {
  margin: 0.35rem 0 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.post-article {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--header-h) + 2.5rem) 1.5rem 4rem;
}

.post-article__meta {
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.post-article__title {
  margin: 0 0 1.5rem;
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.25;
}

.post-article__back {
  margin-top: 2.5rem;
  font-size: 0.95rem;
}

.prose p {
  margin: 0 0 1rem;
}

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

.prose img {
  display: block;
  margin: 1.25rem 0;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.prose h2,
.prose h3 {
  margin-top: 2rem;
  font-weight: 600;
}

.prose pre,
.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.prose :not(pre) > code {
  padding: 0.15em 0.4em;
  border-radius: 3px;
  background: var(--code-bg);
}

.prose pre {
  padding: 1rem 1.1rem;
  overflow-x: auto;
  border-radius: 4px;
  border: 1px solid var(--border);
  line-height: 1.5;
}

.prose pre code {
  padding: 0;
  background: none;
}

.highlight {
  background: #272822;
  color: #f8f8f2;
}

.highlight .c,
.highlight .cm,
.highlight .cp,
.highlight .c1,
.highlight .cs {
  color: #75715e;
}

.highlight .k,
.highlight .kc,
.highlight .kd,
.highlight .kn,
.highlight .kp,
.highlight .kr,
.highlight .kt {
  color: #66d9ef;
}

.highlight .s,
.highlight .s1,
.highlight .s2,
.highlight .sb,
.highlight .sc,
.highlight .sd,
.highlight .se,
.highlight .sh,
.highlight .si,
.highlight .sx,
.highlight .sr,
.highlight .ss {
  color: #e6db74;
}

.highlight .n,
.highlight .na,
.highlight .nb,
.highlight .nc,
.highlight .no,
.highlight .nd,
.highlight .ni,
.highlight .ne,
.highlight .nf,
.highlight .nl,
.highlight .nn,
.highlight .nx,
.highlight .py,
.highlight .nv,
.highlight .vc,
.highlight .vg,
.highlight .vi {
  color: #f8f8f2;
}

.highlight .o,
.highlight .ow {
  color: #f92672;
}

.highlight .m,
.highlight .mf,
.highlight .mh,
.highlight .mi,
.highlight .mo,
.highlight .il {
  color: #ae81ff;
}

.highlight .gd {
  color: #f92672;
}

.highlight .ge {
  font-style: italic;
}

.highlight .gi {
  color: #a6e22e;
}

.highlight .gs {
  font-weight: 700;
}

.highlight .gu {
  color: #75715e;
}

@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero__sidebar {
    min-height: 14rem;
  }

  .hero__sidebar-inner {
    position: relative;
    top: auto;
    min-height: 14rem;
  }

  .site-header__nav {
    display: none;
  }
}