/* Shota Otake | static academic website · GitHub Pages */
:root {
  color-scheme: dark;
  --bg: #0B0B0E;
  --sidebar: #100709;
  --panel: #2a0b0b;
  --text: #f0eef6;
  --muted: #aba7bb;
  --quiet: #777184;
  --accent: #862040;
  --accent-light: #d89aad;
  --line: #4d1a25;
  --sidebar-width: 252px;
  --content-width: 920px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 28px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.85 -apple-system,BlinkMacSystemFont,"Helvetica Neue","Noto Sans JP",Arial,sans-serif;
}

a {
  color: var(--accent-light);
  text-underline-offset: 3px;
}

a:hover {
  color: #f0c0cf;
}

.wrap {
  width: min(var(--content-width), calc(100% - 88px));
  margin: 0 auto;
}


/* Fixed left navigation. Only the document content scrolls. */
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar-width);
  background: var(--sidebar);
  border-right: 1px solid var(--line);
  padding: 36px 18px 26px;
  display: flex;
  flex-direction: column;
  z-index: 20;
}

.side-brand {
  display: flex;
  flex-direction: column;
  padding: 6px 18px 38px;
  color: var(--text);
  text-decoration: none;
  line-height: 1.45;
}

.brand-mark {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -.07em;
  margin-bottom: 16px;
}

.side-brand strong {
  font-size: 17px;
}

.side-brand small {
  color: var(--muted);
  font-size: 12px;
  margin-top: 3px;
}

.side-label {
  color: var(--quiet);
  letter-spacing: .18em;
  font-weight: 700;
  font-size: 10px;
  padding: 0 18px 12px;
}

.side-nav {
  display: grid;
  gap: 3px;
}

.side-nav a {
  display: flex;
  gap: 13px;
  align-items: center;
  padding: 10px 13px;
  border-radius: 8px;
  color: #bab5c7;
  text-decoration: none;
  font-size: 13px;
  font-weight: 550;
  border-left: 3px solid transparent;
  transition: background .15s,color .15s;
}

.side-nav a:hover {
  background: #321016;
  color: var(--text);
}

.side-nav a.active {
  background: #3b0f1a;
  color: #fff6f8;
  border-left-color: var(--accent-light);
}

.side-bottom {
  margin-top: auto;
  padding: 16px 18px 0;
  border-top: 1px solid var(--line);
  font-size: 12px;
}

.side-bottom a {
  text-decoration: none;
}

.side-bottom p {
  color: var(--quiet);
  margin: 8px 0 0;
  font-size: 11px;
}

.mobile-header,.mobile-backdrop {
  display: none;
}

.page-content {
  margin-left: var(--sidebar-width);
  min-height: 100vh;
}


/* Introduction and headings */
.hero {
  padding: 90px 0 68px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--accent-light);
  letter-spacing: .16em;
  font-size: 11px;
  font-weight: 750;
}

.eyebrow-line {
  width: 28px;
  height: 2px;
  background: var(--accent-light);
  display: inline-block;
}

.hero h1 {
  font-size: clamp(38px,5vw,60px);
  line-height: 1.3;
  letter-spacing: .025em;
  margin: 23px 0 15px;
}

.hero h1 span {
  display: block;
  color: #b2b9c8;
  font-size: .48em;
  font-weight: 400;
  margin-top: 6px;
}

.hero-theme {
  font-size: 20px;
  font-weight: 650;
  margin: 27px 0 12px;
}

.hero-theme span {
  color: var(--muted);
  font-size: 14px;
  font-weight: 400;
}

.affiliation,.lead {
  color: var(--muted);
}

.pill-row,.subnav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.pill-row a,.subnav a {
  color: #f0d8df;
  background: #21080c;
  border: 1px solid #5b1e2f;
  padding: 6px 14px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 12px;
}

.pill-row a:hover,.subnav a:hover {
  border-color: var(--accent-light);
  background: #3b0f1a;
}

.content-section {
  padding: 64px 0 55px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 15px;
}

.section-heading {
  margin-bottom: 28px;
}

.section-heading>p {
  margin: 0 0 7px;
  color: var(--accent-light);
  letter-spacing: .16em;
  font-size: 11px;
  font-weight: 700;
}

.section-heading h2 {
  font-size: 30px;
  margin: 0;
  line-height: 1.4;
}

.section-heading h2 span,h3 span {
  color: var(--muted);
  font-size: .62em;
  font-weight: 400;
  margin-left: 8px;
}

.content-section h3 {
  font-size: 18px;
  margin: 36px 0 13px;
}

.content-section p {
  max-width: 850px;
}

.muted,.smallnote {
  color: var(--muted);
}

.small,.smallnote {
  font-size: 12px;
}

.columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 35px;
}

.clean-list {
  padding-left: 18px;
}

.clean-list li {
  margin: 8px 0;
}


/* News / research / scholarly outputs */
.timeline {
  padding: 0;
  margin: 0;
  list-style: none;
}

.timeline li,.timeline-row {
  display: grid;
  grid-template-columns: 126px 1fr;
  gap: 21px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}

.timeline time,.timeline-row time {
  color: var(--accent-light);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.archive {
  margin-top: 15px;
}

.archive summary {
  color: var(--accent-light);
  cursor: pointer;
  padding: 10px 0;
  font-size: 13px;
}

.year {
  color: var(--accent-light);
  font-size: 15px!important;
  margin: 25px 0 12px!important;
}

.papers {
  padding: 0;
  margin: 0;
  list-style: none;
  counter-reset: paper;
}

.papers li {
  counter-increment: paper;
  position: relative;
  border-bottom: 1px solid var(--line);
  padding: 16px 0 19px 35px;
}

.papers li::before {
  content: counter(paper)'.';
  position: absolute;
  left: 0;
  top: 17px;
  font-size: 12px;
  color: var(--accent-light);
}

.paper-title {
  font-weight: 700;
  color: var(--text);
  line-height: 1.6;
}

.authors {
  font-size: 13px;
  color: #c9c5d4;
  margin-top: 5px;
}

.journal {
  font-size: 13px;
  color: var(--muted);
  font-style: italic;
}

.papers a {
  display: inline-block;
  margin-top: 4px;
  text-decoration: none;
  font-size: 12px;
  font-weight: 700;
}

.talks,.award-list {
  padding: 0;
  list-style: none;
}

.talks li,.award-list li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 17px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}

.talk-year,.award-year {
  color: var(--accent-light);
  font-size: 12px;
}

.talks strong,.award-list strong {
  display: block;
  font-weight: 650;
}

.talks small,.award-list small {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}

#first-author,#co-author {
  scroll-margin-top: 25px;
}

.footer-inner {
  padding: 25px 0 35px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--quiet);
  font-size: 12px;
}


/* Phone and small tablet: collapsible sidebar */
@media(max-width: 900px) {
  .sidebar {
    transform: translateX(-102%);
    transition: transform .2s;
    box-shadow: none;
  }
  body.menu-open .sidebar {
    transform: translateX(0);
    box-shadow: 12px 0 45px #0009;
  }
  .mobile-header {
    position: sticky;
    top: 0;
    z-index: 15;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 58px;
    padding: 10px 18px;
    background: #180303;
    border-bottom: 1px solid var(--line);
    gap: 10px;
  }
  .mobile-header a {
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 13px;
    line-height: 1.4;
  }
  .mobile-header a span {
    color: var(--muted);
    font-weight: 400;
  }
  .mobile-header button {
    color: var(--accent-light);
    border: 1px solid var(--line);
    background: var(--panel);
    border-radius: 6px;
    padding: 6px 10px;
    cursor: pointer;
    flex: none;
  }
  body.menu-open .mobile-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: #0009;
    z-index: 19;
  }
  .page-content {
    margin-left: 0;
  }
  .wrap {
    width: min(100% - 38px,760px);
  }
  .hero {
    padding: 54px 0;
  }
  .content-section {
    padding: 48px 0 42px;
    scroll-margin-top: 60px;
  }
  .columns {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .section-heading h2 {
    font-size: 25px;
  }
}

@media(max-width: 520px) {
  .hero h1 {
    font-size: 38px;
  }
  .hero-theme {
    font-size: 17px;
  }
  .timeline li,.timeline-row {
    grid-template-columns: 97px 1fr;
    gap: 10px;
  }
  .research-list article {
    grid-template-columns: 35px 1fr;
    gap: 11px;
  }
  .papers li {
    padding-left: 25px;
  }
}

@media(prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .sidebar {
    transition: none;
  }
}


/* V3 · navigation, headings and research photograph */
.side-brand {
  padding: 7px 14px 34px;
}

.side-nav a {
  padding: 11px 19px;
  font-size: 14px;
}

.side-nav a.active {
  background: #3b0f1a;
  border-left-color: #d89aad;
}

.hero {
  min-height: 325px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(180px, 34%);
  gap: 8px 40px;
  align-content: center;
}

.hero > :not(.hero-image) {
  grid-column: 1;
}

.hero h1 {
  margin-top: 0;
}

.hero-image {
  grid-column: 2;
  grid-row: 1 / span 4;
  margin: 0;
  align-self: center;
  aspect-ratio: 4/3;
  border-radius: 10px;
  border: 1px solid #612433;
  overflow: hidden;
  background: linear-gradient(150deg,#2b0b10,#862040 65%,#140203);
  position: relative;
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-image figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 14px;
  font-size: 11px;
  color: #f2f5ff;
  background: linear-gradient(transparent,#050912b8);
}

.hero-image.image-missing figcaption {
  display: none;
}

.section-heading {
  display: flex;
  align-items: flex-start;
  gap: 22px;
}

.section-heading::before {
  content: '';
  display: block;
  flex: none;
  width: 6px;
  min-height: 66px;
  border-radius: 6px;
  background: linear-gradient(180deg,#e1b1be 0%,#862040 60%,#2b050f 100%);
  box-shadow: 0 0 20px #86204055;
}

.section-heading h2 {
  padding-top: 9px;
}

.hero .eyebrow,.section-heading > p,.side-label,.side-nav a span {
  display: none;
}

.papers li::before {
  color: #d89aad;
}

@media (max-width: 700px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 9px;
  }
  .hero-image {
    grid-column: 1;
    grid-row: auto;
    width: min(100%, 330px);
    margin-top: 18px;
  }
  .section-heading::before {
    min-height: 53px;
  }
}


/* Top-page photo slideshow */
.photo-slider {
  isolation: isolate;
}

.photo-slider .slides {
  position: absolute;
  inset: 0;
}

.photo-slider .slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity .75s ease;
}

.photo-slider .slide.is-active {
  opacity: 1;
}

.photo-slider .slide-arrow {
  position: absolute;
  z-index: 2;
  top: 50%;
  transform: translateY(-50%);
  border: 1px solid #ffffff55;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  background: #080c19a6;
  color: white;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.photo-slider .slide-prev {
  left: 9px;
}

.photo-slider .slide-next {
  right: 9px;
}

.photo-slider .slide-dots {
  position: absolute;
  z-index: 2;
  bottom: 10px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  gap: 8px;
}

.photo-slider .slide-dot {
  width: 8px;
  height: 8px;
  border: none;
  border-radius: 50%;
  background: #ffffff77;
  padding: 0;
  cursor: pointer;
}

.photo-slider .slide-dot.is-active {
  background: #fff;
  box-shadow: 0 0 0 2px #223670;
}

.photo-slider button:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .photo-slider .slide {
    transition: none;
  }
}

.news-highlight {
  color: #C9A333;
  font-weight: 700;
}

.side-brand {
  padding: 8px 14px 34px;
}

.side-brand strong {
  font-size: 16px;
  line-height: 1.5;
}

.side-brand small {
  font-size: 12px;
  color: var(--muted);
  margin-top: 6px;
}

.sidebar {
  background: linear-gradient(180deg,#180303 0%, #130202 100%);
}

.page-content {
  background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0)) no-repeat;
}

.timeline li:last-child, .timeline-row:last-child, .papers li:last-child, .talks li:last-child, .award-list li:last-child {
  border-bottom: 0;
}

.photo-slider .slide-dot.is-active {
  background: #fff;
  box-shadow: 0 0 0 2px #862040;
}

.photo-slider .slide-arrow {
  background: #1f090db3;
  border-color: #ffffff55;
}

.timeline li span, .timeline-row span {
  line-height: 1.75;
}