:root {
  --about-ink: #254e70;
  --about-text: #506873;
  --about-coral: #df6b63;
  --about-coral-dark: #bd514a;
  --about-paper: #ffffff;
  --about-bg: #f9fcfc;
  --about-mint: #eaf6f2;
  --about-sky: #eff8fa;
  --about-blush: #fff3f0;
  --about-border: #dce7eb;
  --about-shadow: 0 14px 32px rgba(37, 78, 112, .08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.about-page {
  margin: 0;
  padding-bottom: 5rem;
  background: var(--about-bg);
  color: var(--about-text);
  font-family: "DM Sans", Arial, sans-serif;
  line-height: 1.65;
}

body.about-page--tw {
  font-family: "Noto Sans TC", "DM Sans", "Microsoft JhengHei", Arial, sans-serif;
  line-height: 1.72;
}

body.about-page--cn {
  font-family: "Noto Sans SC", "DM Sans", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.72;
}

body.about-page--ja {
  font-family: "Noto Sans JP", "DM Sans", "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.72;
}

body.about-page--ko {
  font-family: "Noto Sans KR", "DM Sans", "Malgun Gothic", Arial, sans-serif;
  line-height: 1.68;
}

.about-page h1,
.about-page h2,
.about-page h3 {
  margin: 0;
  color: var(--about-ink);
  font-family: "Nunito", Arial, sans-serif;
  line-height: 1.18;
}

.about-page--tw h1,
.about-page--tw h2,
.about-page--tw h3,
.about-page--tw .about-brand {
  font-family: "Noto Sans TC", "Microsoft JhengHei", Arial, sans-serif;
}

.about-page--cn h1,
.about-page--cn h2,
.about-page--cn h3,
.about-page--cn .about-brand {
  font-family: "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
}

.about-page--ja h1,
.about-page--ja h2,
.about-page--ja h3,
.about-page--ja .about-brand {
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
}

.about-page--ko h1,
.about-page--ko h2,
.about-page--ko h3,
.about-page--ko .about-brand {
  font-family: "Noto Sans KR", "Malgun Gothic", Arial, sans-serif;
}

.about-page--tw .about-kicker,
.about-page--cn .about-kicker,
.about-page--ja .about-kicker,
.about-page--ko .about-kicker {
  letter-spacing: 0;
}

.about-page a {
  color: var(--about-ink);
}

.about-shell {
  width: min(1140px, calc(100% - 2rem));
  margin: 0 auto;
}

.about-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--about-border);
  background: rgba(255, 255, 255, .97);
}

.about-header__inner {
  display: flex;
  gap: 1.2rem;
  align-items: center;
  min-height: 72px;
}

.about-brand {
  display: inline-flex;
  gap: .65rem;
  align-items: center;
  color: var(--about-ink);
  font-family: "Nunito", Arial, sans-serif;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.about-brand img {
  width: 40px;
  height: 40px;
}

.about-brand span span {
  color: var(--about-coral);
}

.about-nav {
  display: flex;
  gap: .15rem;
  margin-left: auto;
}

.about-nav a {
  padding: .55rem .68rem;
  border-radius: 7px;
  color: var(--about-text);
  font-weight: 700;
  text-decoration: none;
}

.about-nav a:hover,
.about-nav a:focus-visible {
  background: var(--about-sky);
  color: var(--about-ink);
}

.about-home {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  padding: .5rem .8rem;
  border: 1px solid var(--about-border);
  border-radius: 7px;
  font-weight: 700;
  text-decoration: none;
}

.about-languages {
  position: fixed;
  right: max(1rem, env(safe-area-inset-right));
  bottom: max(1rem, env(safe-area-inset-bottom));
  z-index: 30;
  display: flex;
  gap: .35rem;
  align-items: center;
  padding: .42rem;
  border: 1px solid var(--about-border);
  border-radius: 8px;
  background: rgba(255, 255, 255, .98);
  box-shadow: 0 10px 28px rgba(37, 78, 112, .14);
}

.about-languages__title {
  padding: 0 .45rem 0 .25rem;
  color: var(--about-text);
  font-size: .8rem;
  font-weight: 700;
}

.about-languages a {
  display: inline-flex;
  gap: .28rem;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  min-height: 42px;
  padding: .28rem .42rem;
  border-radius: 7px;
  color: var(--about-ink);
  font-size: .78rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
}

.about-languages img {
  display: block;
  width: 20px;
  height: auto;
}

.about-languages a:hover,
.about-languages a:focus-visible {
  background: var(--about-sky);
}

.about-languages a[aria-current="page"] {
  background: var(--about-mint);
  box-shadow: inset 0 0 0 1px #cfe4dc;
}

.about-main {
  padding: 1.1rem 0 3rem;
}

.about-breadcrumb {
  display: flex;
  gap: .5rem;
  margin-bottom: 1rem;
  color: #748b96;
  font-size: .92rem;
}

.about-breadcrumb a {
  text-decoration: none;
}

.about-hero {
  display: grid;
  grid-template-columns: minmax(390px, 1fr) 355px;
  gap: clamp(1.25rem, 4vw, 2rem);
  padding: clamp(1.2rem, 4vw, 2.2rem);
  border: 1px solid var(--about-border);
  border-radius: 8px;
  background: var(--about-paper);
  box-shadow: var(--about-shadow);
}

.about-kicker {
  display: inline-flex;
  margin: 0 0 .65rem;
  padding: .26rem .58rem;
  border-radius: 999px;
  background: var(--about-blush);
  color: var(--about-coral-dark);
  font-size: .82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
}

.about-hero h1 {
  margin-bottom: .72rem;
  font-size: clamp(2.1rem, 4vw, 3rem);
}

.about-hero__role {
  margin: 0 0 .8rem;
  color: var(--about-ink);
  font-size: 1.12rem;
  font-weight: 700;
}

.about-hero__lead {
  max-width: 60ch;
  margin: 0 0 1.25rem;
  font-size: 1.03rem;
}

.about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .62rem;
}

.about-btn {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: .68rem 1.05rem;
  border-radius: 7px;
  background: var(--about-coral);
  color: white !important;
  font-weight: 700;
  text-decoration: none;
  transition: background .18s ease, transform .18s ease;
}

.about-btn:hover,
.about-btn:focus-visible {
  background: var(--about-coral-dark);
  transform: translateY(-1px);
}

.about-btn--secondary {
  border: 1px solid var(--about-border);
  background: white;
  color: var(--about-ink) !important;
}

.about-btn--secondary:hover,
.about-btn--secondary:focus-visible {
  background: var(--about-sky);
}

.about-profile {
  padding: .8rem;
  border-radius: 8px;
  background: var(--about-sky);
}

.about-profile img {
  width: 100%;
  height: 335px;
  border-radius: 7px;
  object-fit: cover;
  object-position: center 20%;
}

.about-profile__body {
  padding: .85rem .35rem .2rem;
}

.about-profile h2 {
  margin-bottom: .35rem;
  font-size: 1.3rem;
}

.about-profile p {
  margin: 0;
  font-size: .94rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .75rem;
  margin-top: 1rem;
}

.about-stat {
  padding: .9rem .75rem;
  border: 1px solid var(--about-border);
  border-radius: 8px;
  background: var(--about-paper);
}

.about-stat strong {
  display: block;
  margin-bottom: .15rem;
  color: var(--about-ink);
  font-family: "Nunito", Arial, sans-serif;
  font-size: 1.5rem;
}

.about-stat span {
  font-size: .88rem;
}

.about-section {
  margin-top: clamp(1.65rem, 4vw, 2.5rem);
}

.about-section__head {
  max-width: 700px;
  margin-bottom: 1rem;
}

.about-section__head h2 {
  margin-bottom: .3rem;
  font-size: clamp(1.45rem, 2.6vw, 1.82rem);
}

.about-section__head p {
  margin: 0;
}

.about-columns {
  display: grid;
  grid-template-columns: 1.06fr .94fr;
  gap: 1rem;
}

.about-panel {
  padding: clamp(1rem, 3vw, 1.35rem);
  border: 1px solid var(--about-border);
  border-radius: 8px;
  background: var(--about-paper);
}

.about-panel--tint {
  background: var(--about-mint);
}

.about-panel h2 {
  margin-bottom: .55rem;
  font-size: 1.35rem;
}

.about-panel h3 {
  margin: 1rem 0 .35rem;
  font-size: 1.08rem;
}

.about-panel p {
  margin: 0 0 .8rem;
}

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

.about-approach {
  display: grid;
  grid-template-columns: 1fr 190px;
  gap: 1rem;
  align-items: center;
}

.about-approach img {
  width: 100%;
  height: auto;
}

.about-timeline {
  position: relative;
  margin-top: .35rem;
  padding-left: 1.25rem;
}

.about-timeline::before {
  position: absolute;
  top: .35rem;
  bottom: .35rem;
  left: 5px;
  width: 2px;
  background: #d5e4ea;
  content: "";
}

.about-milestone {
  position: relative;
  padding: 0 0 1rem .75rem;
}

.about-milestone:last-child {
  padding-bottom: 0;
}

.about-milestone::before {
  position: absolute;
  top: .35rem;
  left: -1.25rem;
  width: 12px;
  height: 12px;
  border: 3px solid var(--about-ink);
  border-radius: 50%;
  background: white;
  content: "";
}

.about-milestone h3 {
  margin: 0 0 .26rem;
  font-size: 1.04rem;
}

.about-milestone p {
  margin: 0;
  font-size: .94rem;
}

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

.about-list li {
  padding: .66rem 0;
  border-bottom: 1px solid var(--about-border);
}

.about-list li:last-child {
  border-bottom: 0;
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .75rem;
}

.research-card {
  padding: 1rem;
  border: 1px solid var(--about-border);
  border-radius: 8px;
  background: var(--about-paper);
}

.research-card h3 {
  margin-bottom: .45rem;
  font-size: 1.08rem;
}

.research-card p {
  margin: 0;
  font-size: .94rem;
}

.publication-list {
  display: grid;
  gap: .75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.publication-list li {
  padding: 1rem;
  border: 1px solid var(--about-border);
  border-radius: 8px;
  background: var(--about-paper);
}

.publication-list strong {
  display: block;
  margin-bottom: .3rem;
  color: var(--about-ink);
}

.publication-list a {
  display: inline-flex;
  margin-top: .4rem;
  color: var(--about-coral-dark);
  font-weight: 700;
  text-decoration: none;
}

.about-gallery {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .75rem;
}

.gallery-item {
  margin: 0;
  border: 1px solid var(--about-border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--about-paper);
}

.gallery-item button {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
}

.gallery-item img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.gallery-item figcaption {
  padding: .55rem .62rem;
  color: var(--about-text);
  font-size: .87rem;
}

.about-contact {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.2rem;
  align-items: center;
  padding: clamp(1rem, 4vw, 1.55rem);
  background: var(--about-sky);
}

.about-contact h2 {
  margin-bottom: .35rem;
}

.about-contact p {
  margin: 0;
}

.about-contact__actions {
  display: flex;
  gap: .6rem;
}

.about-footer {
  padding: 1.45rem 1rem 2rem;
  border-top: 1px solid var(--about-border);
  color: #768d97;
  text-align: center;
  font-size: .92rem;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: rgba(16, 31, 40, .9);
}

.lightbox[aria-hidden="false"] {
  display: flex;
}

.lightbox img {
  max-width: min(92vw, 950px);
  max-height: 82vh;
  border-radius: 8px;
}

.lightbox__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 7px;
  background: white;
  color: var(--about-ink);
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 940px) {
  .about-header__inner {
    flex-wrap: wrap;
    padding: .72rem 0;
  }

  .about-nav {
    order: 3;
    width: 100%;
  }

  .about-hero,
  .about-columns,
  .about-contact {
    grid-template-columns: minmax(0, 1fr);
  }

  .about-hero > *,
  .about-columns > *,
  .about-contact > * {
    min-width: 0;
  }

  .about-profile {
    display: grid;
    grid-template-columns: 190px 1fr;
    max-width: 600px;
  }

  .about-profile img {
    height: 245px;
  }

  .about-profile__body {
    align-self: center;
    padding: 1rem;
  }

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

@media (max-width: 600px) {
  body.about-page {
    padding-bottom: 4.8rem;
  }

  .about-languages {
    right: auto;
    left: 50%;
    bottom: max(.65rem, env(safe-area-inset-bottom));
    transform: translateX(-50%);
    gap: .18rem;
    max-width: calc(100% - 1rem);
    padding: .3rem;
  }

  .about-languages__title {
    display: none;
  }

  .about-languages a {
    min-width: 43px;
    min-height: 40px;
    padding: .25rem .3rem;
  }

  .about-shell {
    width: min(calc(100% - 1.25rem), 470px);
  }

  .about-brand span {
    display: none;
  }

  .about-header__inner {
    gap: .5rem;
  }

  .about-nav {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: .08rem;
  }

  .about-nav a {
    display: grid;
    place-items: center;
    min-height: 46px;
    padding: .3rem .08rem;
    font-size: .78rem;
    line-height: 1.18;
    text-align: center;
  }

  .about-page--tw .about-nav a,
  .about-page--cn .about-nav a,
  .about-page--ja .about-nav a,
  .about-page--ko .about-nav a {
    font-size: .74rem;
  }

  .about-hero {
    padding: 1rem;
  }

  .about-hero h1 {
    font-size: 2rem;
  }

  .about-actions,
  .about-btn {
    width: 100%;
  }

  .about-profile {
    display: block;
  }

  .about-profile img {
    height: 300px;
  }

  .about-stats,
  .research-grid,
  .about-gallery {
    grid-template-columns: 1fr;
  }

  .about-approach {
    grid-template-columns: 1fr;
  }

  .about-approach img {
    max-width: 260px;
    margin: 0 auto;
  }

  .about-contact__actions {
    flex-direction: column;
  }
}