/* ===== Pretendard self-hosted webfont (subset, weights 400/600 only) ===== */
@font-face {
  font-family: 'Pretendard';
  src: url("../fonts/Pretendard-Regular.subset.97213db5c578.woff2") format('woff2');
  font-weight: 400;
  font-style: normal;
  /* optional: 폰트가 (캐시 등으로) 빠르게 준비되면 바로 쓰고, 아니면 대체 폰트를
     끝까지 사용한다. swap과 달리 로딩 도중 폰트가 바뀌면서 텍스트가 다시
     줄바꿈되는 현상이 없다 — 페이지 이동마다 새로 로드되는 사이트라 중요하다. */
  font-display: optional;
}

@font-face {
  font-family: 'Pretendard';
  src: url("../fonts/Pretendard-SemiBold.subset.3ba9cd1e8bcb.woff2") format('woff2');
  font-weight: 600;
  font-style: normal;
  /* optional: 폰트가 (캐시 등으로) 빠르게 준비되면 바로 쓰고, 아니면 대체 폰트를
     끝까지 사용한다. swap과 달리 로딩 도중 폰트가 바뀌면서 텍스트가 다시
     줄바꿈되는 현상이 없다 — 페이지 이동마다 새로 로드되는 사이트라 중요하다. */
  font-display: optional;
}

/* ===== Design tokens ===== */
:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #666666;
  --color-border: #e5e5e5;
  --color-accent: #1a3c7a;
  --color-accent-contrast: #ffffff;

  /* 모집공고 창(macOS 창 모양)에만 쓰는 색 */
  --color-window-border: rgba(0, 0, 0, 0.12);
  --color-window-titlebar: #f6f6f7;
  --color-window-minimize: #febc2e;
  --color-window-zoom: #28c840;
  --color-window-close: #ff5f57;
  --color-backdrop: rgba(0, 0, 0, 0.5);
  --shadow-window: 0 12px 32px rgba(0, 0, 0, 0.12), 0 2px 6px rgba(0, 0, 0, 0.06);

  --font-body: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Malgun Gothic', sans-serif;

  --content-max-width: 1000px;
  --page-padding-inline: 24px;

  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 48px;
  --space-xl: 80px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  /* 페이지마다 콘텐츠 길이가 달라 스크롤바가 생겼다 사라졌다 하면서 본문 폭이
     바뀌고 텍스트가 다시 줄바꿈되는 것을 막기 위해 스크롤바 자리를 항상 확보한다. */
  scrollbar-gutter: stable;
}

body {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
}

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

h1, h2, h3, p {
  margin: 0;
}

button {
  font-family: inherit;
}

/* ===== Base typography ===== */
body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
}

h1, h2, h3, .heading {
  font-weight: 600;
  line-height: 1.4;
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

/* ===== Layout primitives ===== */
.container {
  max-width: var(--content-max-width);
  margin-inline: auto;
  padding-inline: var(--page-padding-inline);
}

section {
  padding-block: var(--space-lg);
}

.section-title {
  margin-bottom: var(--space-md);
}

/* ===== Shared UI ===== */
.hr {
  border: none;
  border-top: 1px solid var(--color-border);
}

.btn {
  display: inline-block;
  font-weight: 600;
  font-size: 16px;
  padding: 10px 20px;
  border-radius: 4px;
  border: 1px solid var(--color-accent);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-accent-contrast);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
}

.text-muted {
  color: var(--color-text-muted);
}

.text-small {
  font-size: 14px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== layouts/BaseLayout ===== */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  padding: 8px 16px;
  z-index: 1000;
}

.skip-link:focus {
  left: 8px;
  top: 8px;
}

/* ===== components/Header ===== */
.site-header {
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 100;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-sm);
  gap: var(--space-md);
}

.site-header__brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  line-height: 1.3;
}

.site-header__brand-main {
  font-weight: 600;
  font-size: 18px;
  color: var(--color-text);
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.site-header__nav ul {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.site-header__nav li a {
  text-decoration: none;
  font-size: 15px;
  color: var(--color-text);
  white-space: nowrap;
}

.site-header__nav li a[aria-current='page'] {
  color: var(--color-accent);
  font-weight: 600;
}

.site-header__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.site-header__toggle-bar,
.site-header__toggle-bar::before,
.site-header__toggle-bar::after {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  position: relative;
}

.site-header__toggle-bar::before,
.site-header__toggle-bar::after {
  content: '';
  position: absolute;
  left: 0;
}

.site-header__toggle-bar::before {
  top: -6px;
}

.site-header__toggle-bar::after {
  top: 6px;
}

@media (max-width: 767px) {
  .site-header__toggle {
    display: block;
  }

  .site-header__nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-md) var(--page-padding-inline);
    gap: var(--space-md);
  }

  .site-header__nav.is-open {
    display: flex;
  }

  .site-header__nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
}

/* ===== components/Footer ===== */
.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-xl);
}

.site-footer__inner {
  padding-block: var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.site-footer__lab {
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

/* ===== components/NewsItem ===== */
.news-item {
  display: flex;
  gap: var(--space-sm);
  padding-block: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.news-item__image {
  width: 80px;
  height: 80px;
  object-fit: cover;
  flex-shrink: 0;
  border-radius: 4px;
}

.news-item__meta {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-bottom: 4px;
}

.news-item__badge {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: 999px;
  padding: 2px 8px;
}

.news-item__title {
  font-weight: 600;
}

/* ===== components/PublicationItem ===== */
.pub-item {
  padding-block: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.pub-item__title {
  font-size: 16px;
  font-weight: 400;
}

.pub-item__meta {
  margin-top: 4px;
}

/* 논문 링크가 있는 제목 */
.pub-item__title a {
  color: var(--color-accent);
  text-decoration: none;
}

.pub-item__title a:hover,
.pub-item__title a:focus-visible {
  text-decoration: underline;
}

/* 올해 논문: 옆에서 미끄러지며 나타난다 (탭·페이지를 바꿔 다시 보일 때도 재생) */
.pub-item--this-year .pub-item__title,
.pub-item--this-year .pub-item__meta {
  animation: pub-fade-in 0.9s ease-out 0.2s both;
}

@keyframes pub-fade-in {
  from {
    opacity: 0;
    transform: translateX(14px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .pub-item--this-year .pub-item__title,
  .pub-item--this-year .pub-item__meta {
    animation: none;
  }
}

/* ===== components/ResearchCard ===== */
.research-card {
  padding-block: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.research-card:last-child {
  border-bottom: none;
}

.research-card__body {
  margin-top: var(--space-xs);
  color: var(--color-text-muted);
}

.research-card__body p {
  margin: 0;
}

.research-card__body p + p {
  margin-top: var(--space-xs);
}

/* ===== pages/index ===== */
.hero {
  text-align: center;
  padding-block: var(--space-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.hero__tagline {
  color: var(--color-text-muted);
  max-width: 560px;
}

/* 모집공고: macOS 창 모양 (2026-11-05 결정 — 이 블록만 그림자·버튼 색·짧은 전환 효과를 예외로 허용) */
.recruit-window {
  background: var(--color-bg);
  border: 1px solid var(--color-window-border);
  border-radius: 10px;
  box-shadow: var(--shadow-window);
  overflow: hidden;
}

.recruit-window__titlebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: 10px var(--space-sm) 10px var(--space-md);
  background: var(--color-window-titlebar);
  border-bottom: 1px solid var(--color-border);
}

.recruit-window.is-collapsed .recruit-window__titlebar {
  border-bottom-color: transparent;
}

.recruit-window__title {
  font-weight: 600;
  color: var(--color-accent);
}

.recruit-window__controls {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

/* 버튼 자체는 터치하기 쉽도록 24px, 보이는 동그라미는 13px */
.recruit-window__control {
  position: relative;
  width: 24px;
  height: 24px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.recruit-window__control::before {
  content: '';
  position: absolute;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--dot-color);
  box-shadow: inset 0 0 0 0.5px rgba(0, 0, 0, 0.2);
}

.recruit-window__control--minimize { --dot-color: var(--color-window-minimize); }
.recruit-window__control--zoom { --dot-color: var(--color-window-zoom); }
.recruit-window__control--close { --dot-color: var(--color-window-close); }

/* 버튼 위에 마우스를 올리거나 키보드로 이동하면 기호(− + ×)가 나타난다 */
.recruit-window__control svg {
  position: relative;
  width: 9px;
  height: 9px;
  fill: none;
  stroke: rgba(0, 0, 0, 0.55);
  stroke-width: 1.4;
  stroke-linecap: round;
  opacity: 0;
}

.recruit-window__controls:hover svg,
.recruit-window__control:focus-visible svg {
  opacity: 1;
}

.recruit-window__control:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 0;
  border-radius: 50%;
}

/* 여백은 안쪽 요소의 margin 으로 준다. 본문 자체에 padding 을 주면 접었을 때 그만큼 흰 띠가 남는다. */
.recruit-window .recruit-carousel {
  margin: var(--space-sm) var(--space-md) 0;
}

.recruit-window .recruit-carousel__dots {
  margin: var(--space-sm) 0;
}

/* 한글이 단어 중간에서 줄바꿈되지 않게 한다 */
.recruit-window .recruit-carousel__slide {
  word-break: keep-all;
}

/* 초록 버튼: 화면 가운데 크게 띄우고 뒤를 어둡게 한다 */
.recruit-window.is-zoomed {
  position: fixed;
  top: 50%;
  left: 50%;
  z-index: 1001;
  width: min(1120px, calc(100vw - 32px));
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  transform: translate(-50%, -50%);
  animation: recruit-zoom-in 0.2s ease-out;
}

.recruit-window.is-zoomed .recruit-carousel {
  margin: var(--space-md) var(--space-lg) 0;
}

.recruit-window.is-zoomed .recruit-carousel__dots {
  margin: var(--space-md) 0;
}

.recruit-window.is-zoomed .recruit-carousel__slide {
  font-size: 1.125rem;
  padding-inline: 56px;
}

.recruit-window.is-zoomed .recruit-carousel__title {
  font-size: 1.5rem;
  margin-bottom: var(--space-xs);
}

@media (max-width: 767px) {
  .recruit-window .recruit-carousel {
    margin-inline: var(--space-xs);
  }

  .recruit-window.is-zoomed .recruit-carousel {
    margin: var(--space-sm) var(--space-xs) 0;
  }

  .recruit-window.is-zoomed .recruit-carousel__slide {
    font-size: 1rem;
    padding-inline: 40px;
  }

  .recruit-window.is-zoomed .recruit-carousel__title {
    font-size: 1.125rem;
  }
}

.recruit-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--color-backdrop);
  animation: recruit-fade-in 0.2s ease-out;
}

.recruit-backdrop[hidden] {
  display: none;
}

/* 크게 보기 중에는 뒤 페이지가 스크롤되지 않게 한다 */
body.has-recruit-zoom {
  overflow: hidden;
}

@keyframes recruit-zoom-in {
  from {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

@keyframes recruit-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .recruit-window.is-zoomed,
  .recruit-backdrop {
    animation: none;
  }

  .recruit-banner__body-wrap {
    transition: none;
  }
}

.recruit-carousel__rule {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-sm) 0 var(--space-xs);
}

.recruit-carousel__links {
  margin: 0;
  display: grid;
  gap: 2px;
}

.recruit-carousel__links > div {
  display: flex;
  gap: var(--space-xs);
  min-width: 0;
}

.recruit-carousel__links dt {
  flex-shrink: 0;
  min-width: 4em;
  color: var(--color-text-muted);
}

.recruit-carousel__links dd {
  margin: 0;
  min-width: 0;
  overflow-wrap: anywhere;
}

.recruit-carousel__links a {
  color: var(--color-accent);
}

.recruit-banner__body-wrap {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows 0.3s ease;
}

.recruit-banner__body-wrap.is-collapsed {
  grid-template-rows: 0fr;
}

.recruit-banner__body {
  overflow: hidden;
  min-height: 0;
}

.recruit-carousel {
  position: relative;
  overflow: hidden;
  margin-top: var(--space-sm);
}

.recruit-carousel__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-bg);
  color: var(--color-accent);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}

.recruit-carousel__arrow:hover {
  border-color: var(--color-accent);
}

.recruit-carousel__arrow--prev {
  left: 4px;
}

.recruit-carousel__arrow--next {
  right: 4px;
}

.recruit-carousel__track {
  display: flex;
  cursor: grab;
  touch-action: pan-y;
  transition: transform 0.3s ease;
}

.recruit-carousel__track:active {
  cursor: grabbing;
}

.recruit-carousel__slide {
  flex: 0 0 100%;
  min-width: 0;
  padding-inline: 40px;
  user-select: none;
}

.recruit-carousel__title {
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 4px;
}

.recruit-carousel__dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: var(--space-sm);
}

.recruit-carousel__dot {
  width: 7px;
  height: 7px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: var(--color-border);
  cursor: pointer;
}

.recruit-carousel__dot.is-active {
  background: var(--color-accent);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-sm);
}

.section-header a {
  font-size: 14px;
  text-decoration: none;
  color: var(--color-accent);
  white-space: nowrap;
}

.research-section {
  padding-block: var(--space-lg);
}

.research-marquee {
  overflow: hidden;
  width: 100%;
  -webkit-mask-image: linear-gradient(to right, transparent, 24px, black 64px, black calc(100% - 64px), transparent calc(100% - 24px));
  mask-image: linear-gradient(to right, transparent, 24px, black 64px, black calc(100% - 64px), transparent calc(100% - 24px));
}

.research-marquee__track {
  display: flex;
  width: max-content;
  gap: var(--space-sm);
  animation: research-marquee 40s linear infinite;
}

.research-marquee:hover .research-marquee__track,
.research-marquee:focus-within .research-marquee__track {
  animation-play-state: paused;
}

@keyframes research-marquee {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .research-marquee__track {
    animation: none;
    flex-wrap: wrap;
    width: 100%;
  }

  .research-marquee__track a[aria-hidden='true'] {
    display: none;
  }
}

.research-grid__card {
  display: block;
  flex: 0 0 240px;
  width: 240px;
  padding: var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  text-decoration: none;
  color: var(--color-text);
}

.research-grid__card h3 {
  margin-bottom: 4px;
}

/* ===== pages/professor ===== */
.professor__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-lg);
  flex-wrap: wrap;
  margin-bottom: var(--space-md);
}

.professor__photo {
  width: 190px;
  height: 190px;
  flex-shrink: 0;
  object-fit: cover;
  border-radius: 4px;
  background: var(--color-border);
}

.professor__position {
  margin-top: var(--space-xs);
  font-weight: 600;
}

.professor__bio {
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.professor__info h2 {
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

.professor__list li {
  padding-block: 4px;
  color: var(--color-text-muted);
}

/* ===== pages/research ===== */
.research-intro {
  margin-bottom: var(--space-lg);
}

.research-intro p + p {
  margin-top: var(--space-sm);
}

/* ===== pages/publications ===== */
.pub-filter {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
  }

  .pub-filter__tab {
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-muted);
    padding: 8px 14px;
    border-radius: 999px;
    border: 1px solid var(--color-border);
  }

  .pub-filter__tab.is-active {
    color: var(--color-accent-contrast);
    background: var(--color-accent);
    border-color: var(--color-accent);
  }

  .pub-list {
    margin-top: var(--space-sm);
  }

/* ===== pages/publications ===== */
.pub-pager {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    margin-top: var(--space-md);
  }

  .pub-pager button {
    padding: 6px 14px;
    font-size: 14px;
  }

  .pub-pager button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
  }

  .pub-pager__numbers {
    display: flex;
    gap: 4px;
  }

  .pub-pager__number {
    width: 28px;
    height: 32px;
    padding: 0;
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    font-size: 14px;
    cursor: pointer;
  }

  .pub-pager__number.is-active {
    color: var(--color-accent);
    font-weight: 600;
  }

/* ===== pages/people/index ===== */
.member-group {
  margin-top: var(--space-lg);
}

.member-group:first-of-type {
  margin-top: 0;
}

.member-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-md);
  margin-block: var(--space-md);
}

.member-item {
  padding: var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.member-item__name {
  font-weight: 600;
}

/* ===== pages/people/alumni ===== */
.alumni-list {
  margin-block: var(--space-md);
}

.alumni-item {
  padding-block: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.alumni-item__row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.alumni-item__name {
  font-weight: 600;
}

.alumni-item p {
  margin-top: 4px;
}

/* ===== pages/course ===== */
.course-group {
  margin-top: var(--space-md);
}

.course-list {
  margin-top: var(--space-xs);
}

.course-item {
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  padding-block: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
}

/* ===== pages/news ===== */
.news-list {
  margin-top: var(--space-sm);
}

/* ===== pages/contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-lg);
  margin-block: var(--space-md);
}

.contact-grid h2,
.contact-address h2 {
  margin-bottom: var(--space-xs);
}

.contact-address {
  margin-bottom: var(--space-md);
}

.contact-inquiry {
  margin-top: var(--space-md);
}

.contact-inquiry__list {
  margin-block: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.contact-inquiry__list li {
  padding-left: 1em;
  position: relative;
  color: var(--color-text-muted);
}

.contact-inquiry__list li::before {
  content: '-';
  position: absolute;
  left: 0;
}

/* ===== pages/404 ===== */
.not-found {
  text-align: center;
  padding-block: var(--space-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}