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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  padding: 0;
  font-weight: normal;
}

p {
  margin: 0;
}

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

dl, dt, dd {
  margin: 0;
  padding: 0;
}

a {
  color: inherit;
}

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

table {
  border-collapse: collapse;
  border-spacing: 0;
}

button {
  box-sizing: border-box;
}

:root {
  
  --color-primary:        #2D5A1B;  
  --color-primary-hover:  #4A7C2F;  
  --color-accent:         #B8860B;  
  --color-accent-dark:    #7A5C10;  
  --color-footer:         #1E3D12;  

  
  --color-bg-main:        #FAFAF7;  
  --color-bg-section-alt: #F0F4EC;  

  
  --color-text-body:      #2C2C2C;  
  --color-text-heading:   #1A3A0F;  
  --color-text-sub:       #666666;  
  --color-text-inverse:   #FAFAF7;  

  
  --color-border:         #D5DDD0;  
}

:root {
  --font-heading-ja:  'Noto Serif JP', 'Georgia', serif;
  --font-body-ja:     'Noto Sans JP', 'Hiragino Kaku Gothic ProN', sans-serif;
  --font-heading-en:  'EB Garamond', 'Georgia', serif;
  --font-ui-en:       'Inter', 'Arial', sans-serif;

  --font-size-base:   1rem;        
  --font-size-sm:     0.875rem;    
  --font-size-h1:     2.0rem;      
  --font-size-h2:     1.6rem;      
  --font-size-h3:     1.25rem;     
  --font-size-nav:    0.9rem;      

  --line-height-body:    1.85;
  --line-height-heading: 1.4;
  --letter-spacing-heading: 0.05em;
}

:root {
  --space-xs:   0.25rem;   
  --space-sm:   0.5rem;    
  --space-md:   1rem;      
  --space-lg:   1.5rem;    
  --space-xl:   2rem;      
  --space-2xl:  3rem;      
  --space-3xl:  4rem;      

  --section-padding-v: var(--space-3xl);  
}

:root {
  --max-width:        1100px;  
  --header-height:    64px;    

  
  
  
}

body {
  font-family: var(--font-body-ja);
  font-size: var(--font-size-base);
  line-height: var(--line-height-body);
  color: var(--color-text-body);
  background-color: var(--color-bg-main);
  min-width: 320px;
}

.site-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  background-color: var(--color-primary);
  height: var(--header-height);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-family: var(--font-heading-ja);
  color: var(--color-text-inverse);
  text-decoration: none;
  letter-spacing: var(--letter-spacing-heading);
  white-space: nowrap;
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.site-logo__univ {
  font-size: 0.7rem;
  font-weight: 400;
  opacity: 0.85;
  letter-spacing: 0.08em;
}

.site-logo__name {
  font-size: 1.05rem;
  font-weight: 700;
}

.page-content {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.page-title {
  padding: var(--space-lg) 0 var(--space-md);
  border-bottom: 2px solid var(--color-primary);
  margin-bottom: var(--space-xl);
}

.page-title h1 {
  font-family: var(--font-heading-ja);
  font-size: var(--font-size-h2);
  font-weight: 700;
  color: var(--color-text-heading);
  line-height: var(--line-height-heading);
  letter-spacing: var(--letter-spacing-heading);
}

.page-title h1 .en {
  font-family: var(--font-heading-en);
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-sub);
  margin-left: var(--space-md);
}

.content-area {
  line-height: var(--line-height-body);
}

#site-footer {
  background-color: var(--color-footer);
  color: var(--color-text-inverse);
  padding: var(--space-xl) var(--space-md);
  text-align: center;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-copyright {
  font-size: var(--font-size-sm);
  color: rgba(250,250,247,0.7);
  margin-top: var(--space-sm);
}

section {
  padding: var(--section-padding-v) 0;
}

section + section {
  border-top: 1px solid var(--color-border);
}

#hpb-skip {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
}

#hpb-skip a {
  display: block;
  position: absolute;
  left: 0;
  top: 0;
  transform: translateY(-100%);
  padding: var(--space-xs) var(--space-md);
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  text-decoration: none;
  font-size: var(--font-size-sm);
  white-space: nowrap;
  transition: transform 0.15s;
}

#hpb-skip a:focus {
  transform: translateY(0);
  outline: 3px solid var(--color-accent);
  outline-offset: -3px;
}

[id="hpb-title"]:focus,
main[tabindex="-1"]:focus {
  outline: none;
  scroll-margin-top: calc(var(--header-height) + var(--space-xs));
}

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

*:focus:not(:focus-visible) {
  outline: none;
}

@media (max-width: 1099px) {
  .page-content {
    padding: var(--space-xl) var(--space-md);
  }
}

@media (max-width: 767px) {
  .page-content {
    padding: var(--space-lg) var(--space-md);
  }
  section {
    padding-top: var(--space-lg);
    padding-bottom: var(--space-lg);
  }
}

.global-nav ul {
  display: flex;
  gap: var(--space-xs);
  list-style: none;
  margin: 0;
  padding: 0;
}

.global-nav a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-body-ja);
  font-size: var(--font-size-nav);
  font-weight: 500;
  color: var(--color-text-inverse);
  text-decoration: none;
  border-radius: 2px;
  transition: color 0.2s, background-color 0.2s;
  white-space: nowrap;
}

.global-nav a:hover {
  color: var(--color-text-inverse);
  background-color: rgba(255,255,255,0.14);
}

.global-nav a.is-active {
  color: var(--color-text-inverse);
  font-weight: 700;
  background-color: rgba(255,255,255,0.08);
  box-shadow: inset 0 -3px 0 rgba(255,255,255,0.75); 
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-inverse);
  transition: transform 0.25s, opacity 0.25s;
}

.hamburger.is-open span:nth-child(1) { transform: translateY(9px) rotate(45deg); }
.hamburger.is-open span:nth-child(2) { opacity: 0; }
.hamburger.is-open span:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }

.mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: var(--color-primary);
  z-index: 99;
  padding: var(--space-md);
}

.mobile-menu.is-open { display: block; }

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

.mobile-menu a {
  display: block;
  padding: var(--space-md) var(--space-lg);
  color: var(--color-text-inverse);
  font-size: 1rem;
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.mobile-menu a:hover {
  background-color: rgba(255,255,255,0.08);
}

@media (max-width: 959px) {
  .global-nav { display: none; }
  .hamburger   { display: flex; }
  .site-logo   { white-space: normal; }
}

.content-area h1 {
  font-family: var(--font-heading-ja);
  font-size: var(--font-size-h2);
  font-weight: 700;
  color: var(--color-text-heading);
  line-height: var(--line-height-heading);
  letter-spacing: var(--letter-spacing-heading);
  padding-bottom: var(--space-sm);
  border-bottom: 3px solid var(--color-primary);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-lg);
}

.content-area h2 {
  font-family: var(--font-heading-ja);
  font-size: var(--font-size-h2);
  font-weight: 700;
  color: var(--color-text-heading);
  line-height: var(--line-height-heading);
  letter-spacing: var(--letter-spacing-heading);
  padding-bottom: var(--space-sm);
  border-bottom: 3px solid var(--color-primary);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-lg);
}

.content-area h3 {
  font-family: var(--font-heading-ja);
  font-size: var(--font-size-h3);
  font-weight: 600;
  color: var(--color-text-heading);
  line-height: var(--line-height-heading);
  letter-spacing: var(--letter-spacing-heading);
  padding-left: var(--space-sm);
  border-left: 4px solid var(--color-primary);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

.content-area h4 {
  font-family: var(--font-body-ja);
  font-size: 1.0rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xs);
}

.content-area table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-base);
  margin: var(--space-lg) 0;
}

.content-area th {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  font-family: var(--font-body-ja);
  font-weight: 600;
  padding: var(--space-sm) var(--space-md);
  text-align: left;
}

.content-area td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.content-area tr:nth-child(even) td {
  background-color: var(--color-bg-section-alt);
}

.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

@media (max-width: 767px) {
  .table-wrapper { overflow-x: auto; }
}

.content-area dl {
  margin: 0;
  padding: 0;
}

.content-area dl > div {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.content-area dt {
  flex: 0 0 7rem;
  font-size: var(--font-size-sm);
  color: var(--color-text-sub);
  font-family: var(--font-ui-en);
}

.content-area dd {
  flex: 1;
  margin: 0;
  line-height: var(--line-height-body);
}

@media (max-width: 767px) {
  .content-area dl > div { flex-direction: column; gap: var(--space-xs); }
  .content-area dt       { flex: none; }
}

.jump-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.content-area .jump-nav a {
  display: inline-block;
  padding: var(--space-sm) var(--space-md); 
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  font-family: var(--font-body-ja);
  font-size: var(--font-size-sm);
  text-decoration: none;
  border-radius: 3px;
  transition: background-color 0.2s;
}

.content-area .jump-nav a:hover {
  background-color: var(--color-primary-hover);
  color: var(--color-text-inverse);
}

.page-top-link {
  display: block;
  text-align: right;
  margin: var(--space-xl) 0 var(--space-md);
}

.page-top-link a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  text-decoration: none;
  font-family: var(--font-body-ja);
  transition: color 0.2s;
}

.page-top-link a::before {
  content: '\2191';
  font-weight: bold;
}

.page-top-link a:hover {
  color: var(--color-primary-hover);
}

#pagetop {
  text-align: right;
  margin: var(--space-xl) 0 var(--space-md);
}

#pagetop a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  text-decoration: none;
  font-family: var(--font-body-ja);
  transition: color 0.2s;
}

#pagetop a:hover {
  color: var(--color-primary-hover);
}

.content-area a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.content-area a:hover {
  color: var(--color-primary-hover);
}

.content-area p {
  margin-bottom: var(--space-md);
  line-height: var(--line-height-body);
}

.content-area hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-xl) 0;
  clear: both;
}

.content-area img.left  { float: left; margin: 0 var(--space-md) var(--space-md) 0; }
.content-area img.right { float: right; margin: 0 0 var(--space-md) var(--space-md); }

.content-area .farm-scene-photos { float: right; margin: 0 0 var(--space-md) var(--space-md); }

@media (max-width: 767px) {
  .content-area img.left,
  .content-area img.right {
    float: none;
    display: block;
    margin: var(--space-md) auto;
  }
  .content-area .farm-scene-photos {
    float: none;
    display: block;
    margin: var(--space-md) auto;
  }
}

.page-content--no-top {
  padding-top: 0;
}

.lab-title-en {
  font-family: var(--font-heading-en);
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-sub);
  margin-left: var(--space-md);
}

.hero {
  width: 100%;
  height: 420px;
  overflow: hidden;
}

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

@media (max-width: 767px) {
  .hero { height: 240px; }
}

.hero-carousel {
  position: relative;
}

.hero-carousel__track {
  width: 100%;
  height: 100%;
  position: relative;
}

.hero-carousel__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease;
  pointer-events: none;
}

.hero-carousel__slide.is-active {
  opacity: 1;
  pointer-events: auto;
}

.hero-carousel__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0, 0, 0, 0.55); 
  color: #fff;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  z-index: 10;
  transition: background 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.hero-carousel__arrow:hover {
  background: rgba(0, 0, 0, 0.72);
}

.hero-carousel__arrow--prev { left: var(--space-md); }
.hero-carousel__arrow--next { right: var(--space-md); }

.hero-carousel__pause {
  position: absolute;
  bottom: var(--space-sm);
  right: var(--space-md);
  background: rgba(0, 0, 0, 0.55); 
  color: #fff;
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-size: 0.75rem;
  cursor: pointer;
  z-index: 11;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  transition: background 0.2s;
}

.hero-carousel__pause:hover {
  background: rgba(0, 0, 0, 0.72);
}

.hero-carousel__dots {
  position: absolute;
  bottom: var(--space-sm);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 2px; 
  z-index: 10;
}

.hero-carousel__dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s;
}

.hero-carousel__dot::after {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  transition: background 0.2s, transform 0.2s;
  display: block;
}

.hero-carousel__dot.is-active::after {
  background: #fff;
  transform: scale(1.25);
}

.hero-carousel__dot:hover::after {
  background: rgba(255, 255, 255, 0.85);
}

.hero-title-overlay {
  position: absolute;
  bottom: 2.5rem;
  left: 2rem;
  z-index: 10;
  background: #F9F8F4;
  border-radius: 6px;
  padding: 6px 12px;
  backdrop-filter: blur(2px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
}

.hero-title-overlay__img {
  display: block;
  height: 56px;
  width: auto;
}

@media (max-width: 767px) {
  .hero-title-overlay {
    display: none;
  }
}

.page-top-content {
  padding: 0;
}

.research-themes__list {
  list-style: none;
  margin: 0 0 var(--space-xl);
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  counter-reset: theme-counter;
}

.research-themes__list li {
  counter-increment: theme-counter;
  background: var(--color-bg-main);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: 2px;
  padding: var(--space-md) var(--space-lg);
  line-height: var(--line-height-body);
  font-weight: 500;
  color: var(--color-text-heading);
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
}

.research-themes__list li::before {
  content: counter(theme-counter);
  font-family: var(--font-heading-en);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  opacity: 0.5;
  line-height: 1.3;
  flex-shrink: 0;
}

@media (max-width: 1099px) {
  .research-themes,
  .news-section,
  .contact-section {
    margin-left: calc(-1 * var(--space-md));
    margin-right: calc(-1 * var(--space-md));
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }
}

@media (max-width: 767px) {
  .research-themes__list { grid-template-columns: 1fr; }
  .research-themes {
    padding-top: var(--space-xl);
    padding-bottom: var(--space-xl);
  }
}

.research-themes__links {
  font-size: var(--font-size-sm);
  color: var(--color-text-sub);
  margin-bottom: var(--space-sm);
}

.research-themes__welcome {
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.text-accent {
  color: #c00;
}

.research-themes__dept-links {
  list-style: none;
  margin: var(--space-sm) 0 var(--space-md);
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-md);
}

.research-themes__dept-links li {
  font-size: var(--font-size-sm);
}

.research-themes__dept-links li::before {
  content: '▶ ';
  color: var(--color-primary);
}

.research-themes__pr {
  font-size: var(--font-size-sm);
  color: var(--color-text-sub);
  margin-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
}

.contact-section {
  background-color: var(--color-bg-section-alt);
  margin-left: calc(-1 * var(--space-lg));
  margin-right: calc(-1 * var(--space-lg));
  padding: var(--space-2xl) var(--space-lg);
}

.contact-address {
  font-style: normal;
  line-height: 1.8;
  color: var(--color-text-main);
}

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

.topics-section {

}

.page-top .research-themes,
.page-top .contact-section,
.page-top .topics-section,
.page-top .news-section {
  border-top: none;
}

.news-section {
  background-color: var(--color-bg-section-alt);
  margin-left: calc(-1 * var(--space-lg));
  margin-right: calc(-1 * var(--space-lg));
  padding: var(--space-2xl) var(--space-lg);
}

@media (max-width: 767px) {
  .news-section {
    padding-top: var(--space-xl);
    padding-bottom: var(--space-xl);
  }
}

.news-section__sub {
  font-size: var(--font-size-sm);
  font-family: var(--font-body-ja);
  font-weight: 400;
  color: var(--color-text-sub);
  margin-left: var(--space-sm);
}

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

.topics-list li {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  line-height: 1.7;
  padding-left: var(--space-md);
  position: relative;
}

.topics-list li::before {
  content: '\2192';
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

.topics-list li:last-child {
  border-bottom: none;
}

.topics-list li.is-hidden {
  display: none;
}

.news-list {
  margin: 0;
  padding: 0;
}

.news-list > div {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.news-list > div.is-hidden {
  display: none;
}

.news-list dt {
  flex: 0 0 8rem;
  font-size: var(--font-size-sm);
  color: var(--color-text-sub);
  font-family: var(--font-ui-en);
}

.news-list dd {
  flex: 1;
  margin: 0;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-body);
}

@media (max-width: 767px) {
  .news-list > div { flex-direction: column; gap: var(--space-xs); }
  .news-list dt    { flex: none; }
}

.show-more-btn {
  display: block;
  margin: var(--space-md) auto 0;
  padding: var(--space-xs) var(--space-xl);
  background: none;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  font-family: var(--font-body-ja);
  font-size: var(--font-size-sm);
  cursor: pointer;
  border-radius: 2px;
  transition: background-color 0.2s, color 0.2s;
}

.show-more-btn:hover {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.show-more-btn.is-expanded {
  display: none;
}

.achievement-section {
  border-top: 1px solid var(--color-border);
}

.achievement-section:first-of-type {
  border-top: none;
}

.achievement-section > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  user-select: none;
  border-radius: 2px;
  transition: background-color 0.15s;
}

.achievement-section > summary::-webkit-details-marker {
  display: none;
}

.achievement-section > summary:hover {
  background-color: var(--color-bg-section-alt);
  padding-left: var(--space-sm);
  padding-right: var(--space-sm);
  margin-left: calc(-1 * var(--space-sm));
  margin-right: calc(-1 * var(--space-sm));
}

.achievement-section > summary h3 {
  margin: 0;
  padding: 0;
  border: none;
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  pointer-events: none;
}

.achievement-section > summary::after {
  content: '\25B6';
  font-size: 0.75rem;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.achievement-section[open] > summary::after {
  transform: rotate(90deg);
}

.section-count {
  font-family: var(--font-ui-en);
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--color-text-sub);
  background: var(--color-bg-section-alt);
  border: 1px solid var(--color-border);
  padding: 0.1rem 0.5rem;
  border-radius: 10px;
  white-space: nowrap;
}

.achievement-body {
  padding: var(--space-md) 0 var(--space-xl);
  line-height: var(--line-height-body);
  font-size: var(--font-size-sm);
}

.year-heading {
  font-family: var(--font-heading-en);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin: var(--space-xl) 0 var(--space-sm);
  padding-bottom: var(--space-xs);
}

.year-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.year-heading:first-child {
  margin-top: var(--space-sm);
}

.paper-entry {
  padding: var(--space-xs) 0 var(--space-sm);
  border-bottom: 1px dotted var(--color-border);
}

.paper-entry:last-child {
  border-bottom: none;
}

.year-section {
  border-top: 1px solid var(--color-border);
}

.year-section:first-of-type {
  border-top: none;
}

.year-section > summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  cursor: pointer;
  user-select: none;
  border-radius: 2px;
  transition: background-color 0.15s;
}

.year-section > summary::-webkit-details-marker { display: none; }

.year-section > summary:hover {
  background-color: var(--color-bg-section-alt);
  padding-left: var(--space-sm);
  padding-right: var(--space-sm);
  margin-left: calc(-1 * var(--space-sm));
  margin-right: calc(-1 * var(--space-sm));
}

.year-label {
  font-family: var(--font-heading-en);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  flex-shrink: 0;
}

.year-preview {
  flex: 1;
  font-size: var(--font-size-sm);
  color: var(--color-text-sub);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
  padding: 0 var(--space-md);
}

.year-section[open] > summary .year-preview {
  display: none;
}

.year-count {
  font-size: 0.78rem;
  color: var(--color-text-sub);
  background: var(--color-bg-section-alt);
  border: 1px solid var(--color-border);
  padding: 0.1rem 0.5rem;
  border-radius: 10px;
}

.year-section > summary::after {
  content: '\25B6';
  font-size: 0.65rem;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-left: auto;
  transition: transform 0.2s ease;
}

.year-section[open] > summary::after {
  transform: rotate(90deg);
}

.year-entries {
  padding-bottom: var(--space-md);
}

.page-laboratory .jump-nav {
  position: sticky;
  top: var(--header-height);
  z-index: 50;
  background: var(--color-bg-main);
  padding-top: var(--space-sm);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.student-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: start;
  margin-bottom: var(--space-2xl);
}

.student-card {
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
  background: var(--color-bg-main);
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.student-card__profile {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-md);
  align-items: flex-start;
}

.student-card__profile img.left {
  float: none !important;
  margin: 0 !important;
  width: 90px;
  height: auto !important;
  flex-shrink: 0;
  border-radius: 2px;
  object-fit: cover;
}

.student-card__info {
  flex: 1;
  min-width: 0;
}

.student-card__info h4 {
  margin-top: 0;
  font-size: 0.95rem;
}

.student-card__info p {
  margin-bottom: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-sub);
}

.student-card__research {
  border-top: 1px solid var(--color-border);
}

.student-card__research summary {
  list-style: none;
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  background: var(--color-bg-section-alt);
  font-family: var(--font-body-ja);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-heading);
  display: flex;
  align-items: flex-start;
  gap: var(--space-xs);
  line-height: var(--line-height-body);
  user-select: none;
}

.student-card__research summary::-webkit-details-marker {
  display: none;
}

.student-card__research summary::before {
  content: '\25B6';
  font-size: 0.6rem;
  flex-shrink: 0;
  margin-top: 0.3em;
  color: var(--color-primary);
  transition: transform 0.2s ease;
}

.student-card__research[open] > summary::before {
  transform: rotate(90deg);
}

.student-card__research summary font {
  color: inherit;
}

.student-card__content {
  padding: var(--space-md);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-body);
  border-top: 1px solid var(--color-border);
}

@media (max-width: 767px) {
  .student-grid {
    grid-template-columns: 1fr;
  }
  .student-card__profile img.left {
    width: 72px;
  }
}

.obog-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-xl);
}

.obog-year {
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
}

.obog-year > summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  background: var(--color-bg-section-alt);
  font-family: var(--font-body-ja);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-heading);
  user-select: none;
}

.obog-year > summary::-webkit-details-marker { display: none; }

.obog-year > summary::before {
  content: '\25B6';
  font-size: 0.6rem;
  color: var(--color-primary);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.obog-year[open] > summary::before {
  transform: rotate(90deg);
}

.obog-year__label {
  font-weight: 700;
}

.obog-year__count {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--color-text-sub);
  margin-left: auto;
}

.obog-year__entries {
  padding: var(--space-xs) 0;
}

.obog-entry {
  display: grid;
  grid-template-columns: 8.5rem 1fr 11rem;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  border-bottom: 1px solid var(--color-border);
  align-items: baseline;
}

.obog-entry:last-of-type {
  border-bottom: none;
}

.obog-entry__name {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-heading);
}

.obog-entry__title {
  font-size: var(--font-size-sm);
  color: var(--color-text-body);
  line-height: var(--line-height-body);
}

.obog-entry__career {
  font-size: 0.75rem;
  color: var(--color-text-sub);
  text-align: right;
}

.obog-year__more {
  display: block;
  text-align: right;
  padding: var(--space-xs) var(--space-md);
  font-size: 0.75rem;
  color: var(--color-primary);
  text-decoration: none;
  border-top: 1px solid var(--color-border);
}

.obog-year__more:hover {
  text-decoration: underline;
}

@media (max-width: 767px) {
  .obog-entry {
    grid-template-columns: 1fr;
    gap: 2px;
    padding: var(--space-sm) var(--space-md);
  }
  .obog-entry__career {
    text-align: left;
    color: var(--color-text-sub);
  }
  .obog-entry__name::after {
    content: '';
  }
}

.event-list {
  list-style: none;
  margin: var(--space-lg) 0;
  padding: 0;
}

.event-item {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
  align-items: start;
}

.event-date {
  font-size: var(--font-size-sm);
  color: var(--color-text-sub);
  padding-top: 0.15em;
  white-space: nowrap;
}

.event-body {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-body);
  overflow: hidden;
}

.event-body a {
  color: var(--color-primary-hover);
}

.event-body div + div {
  margin-top: var(--space-xs);
}

.event-thumb {
  float: right;
  margin: 0 0 var(--space-xs) var(--space-sm);
  border-radius: 3px;
  width: 80px;
  height: auto;
}

.practice-grid {
  margin: var(--space-lg) 0 var(--space-md);
}

.practice-row {
  display: grid;
  grid-template-columns: 5.5rem 72px 1fr;
  gap: var(--space-md);
  align-items: center;
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--color-border);
}

.practice-year {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-body);
  white-space: nowrap;
}

.practice-thumb img {
  display: block;
  width: 72px;
  height: auto;
  border-radius: 3px;
}

.practice-months {
  display: flex;
  flex-wrap: wrap;
  gap: 4px var(--space-xs);
  align-items: center;
}

.practice-months a {
  display: inline-block;
  padding: 2px 8px;
  font-size: var(--font-size-sm);
  color: var(--color-primary-hover);
  background: var(--color-bg-section-alt);
  border-radius: 3px;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
  line-height: 1.6;
}

.practice-months a:hover {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.practice-archive {
  margin-top: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.practice-archive > summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--color-text-sub);
  user-select: none;
}

.practice-archive > summary::-webkit-details-marker { display: none; }

.practice-archive > summary::before {
  content: '\25B6';
  font-size: 0.6rem;
  color: var(--color-primary);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.practice-archive[open] > summary::before {
  transform: rotate(90deg);
}

.practice-archive-list {
  list-style: none;
  margin: 0;
  padding: 0 var(--space-md) var(--space-sm);
  border-top: 1px solid var(--color-border);
}

.practice-archive-item {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: var(--space-sm);
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--color-border);
  align-items: start;
}

.practice-archive-item:last-child {
  border-bottom: none;
}

.practice-archive-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.practice-archive-date {
  font-size: var(--font-size-sm);
  color: var(--color-text-sub);
  white-space: nowrap;
}

.practice-archive-thumb {
  width: 72px;
  height: auto;
  border-radius: 2px;
}

.practice-archive-desc {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-body);
}

.practice-archive-desc a {
  color: var(--color-primary-hover);
}

@media (max-width: 767px) {
  .event-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .event-date {
    font-weight: 600;
  }
  .event-thumb {
    width: 60px;
  }
  .practice-row {
    grid-template-columns: 4rem 56px 1fr;
    gap: var(--space-sm);
  }
  .practice-thumb img {
    width: 56px;
  }
  .practice-archive-item {
    grid-template-columns: 1fr;
  }
  .practice-archive-meta {
    flex-direction: row;
    align-items: center;
    gap: var(--space-sm);
  }
}

.profile-header-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.profile-header-grid h3 {
  margin-top: 0;
}

@media (max-width: 767px) {
  .profile-header-grid { grid-template-columns: 1fr; }
}

.profile-info {
  margin: 0;
  padding: 0;
}

.profile-info > div {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--color-border);
}

.profile-info dt {
  flex: 0 0 3rem;
  font-size: var(--font-size-sm);
  color: var(--color-text-sub);
  font-weight: 600;
  padding-top: 0.1em;
}

.profile-info dd {
  flex: 1;
  margin: 0;
  font-size: var(--font-size-base);
}

.profile-keywords {
  font-size: var(--font-size-sm);
  color: var(--color-text-sub);
  border-left: 3px solid var(--color-border);
  padding-left: var(--space-sm);
  margin-top: var(--space-xs);
  line-height: var(--line-height-body);
}

.profile-topics {
  list-style: none;
  margin: 0 0 var(--space-lg);
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  counter-reset: topic-counter;
}

.profile-topics li {
  counter-increment: topic-counter;
  background: var(--color-bg-section-alt);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-body);
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
}

.profile-topics li::before {
  content: counter(topic-counter);
  font-family: var(--font-heading-en);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  opacity: 0.45;
  flex-shrink: 0;
  line-height: 1.5;
}

@media (max-width: 767px) {
  .profile-topics { grid-template-columns: 1fr; }
}

.society-tags {
  list-style: none;
  margin: 0 0 var(--space-lg);
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-sm);
}

.society-tags li {
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  padding: 0.2rem var(--space-md);
  border-radius: 2px;
  white-space: nowrap;
  font-family: var(--font-body-ja);
}

.career-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-xs) 0 var(--space-md);
  font-size: var(--font-size-sm);
}

.career-table td {
  padding: 0.3rem var(--space-sm);
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
  line-height: var(--line-height-body);
  background: none;
}

.career-table tr:nth-child(even) td {
  background: none;
}

.career-table tr:last-child td {
  border-bottom: none;
}

.career-table .year-col {
  white-space: nowrap;
  color: var(--color-text-sub);
  font-family: var(--font-ui-en);
  font-size: 0.8rem;
  width: 7.5rem;
  padding-right: var(--space-md);
}

.career-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

@media (max-width: 767px) {
  .career-grid { grid-template-columns: 1fr; }
}

.edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.edu-grid h5 {
  margin-top: 0;
}

@media (max-width: 767px) {
  .edu-grid { grid-template-columns: 1fr; }
}

.activities-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

@media (max-width: 767px) {
  .activities-grid { grid-template-columns: 1fr; }
}

.activities-grid h5 {
  margin-top: 0;
}

.activity-list {
  list-style: none;
  margin: var(--space-xs) 0 0;
  padding: 0;
}

.activity-list li {
  padding: var(--space-xs) 0 var(--space-xs) var(--space-md);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-body);
  position: relative;
}

.activity-list li::before {
  content: '\2192';
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

.activity-list li:last-child {
  border-bottom: none;
}

.content-area h5 {
  font-family: var(--font-body-ja);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-sub);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xs);
  padding-bottom: var(--space-xs);
  border-bottom: 1px dashed var(--color-border);
}

.page-class .content-area table td[rowspan],
.page-class .content-area table td.group-cell {
  background-color: #D8E8D2;
  font-weight: 600;
  font-family: var(--font-body-ja);
  font-size: var(--font-size-sm);
  color: var(--color-text-heading);
  vertical-align: middle;
  text-align: center;
  padding: var(--space-sm);
  line-height: 1.5;
  border-right: 2px solid var(--color-border);
}

.page-class .content-area table tr:has(td[rowspan]),
.page-class .content-area table tr:has(td.group-cell) {
  border-top: 2px solid var(--color-primary);
}

.page-class .content-area table tr:first-child {
  border-top: none;
}

.page-class .content-area tr:nth-child(even) td[rowspan],
.page-class .content-area tr:nth-child(even) td.group-cell {
  background-color: #D8E8D2;
}

.content-area p.large {
  font-family: var(--font-heading-ja);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.page-access .map-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  margin-bottom: var(--space-lg);
}

.page-access .map-wrapper iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.field-photo-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.field-photo-grid figure {
  margin: 0;
}

.field-photo-grid img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
}

.field-photo-grid figcaption {
  font-size: var(--font-size-sm);
  color: var(--color-text-sub);
  margin-top: var(--space-xs);
  text-align: center;
}

@media (max-width: 767px) {
  .field-photo-grid {
    grid-template-columns: 1fr;
  }
}

.activity-accordion {
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: var(--space-lg);
}

.activity-accordion__heading {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-text-heading);
  background: var(--color-bg-section-alt);
  user-select: none;
  transition: background 0.15s;
}

.activity-accordion__heading::-webkit-details-marker { display: none; }

.activity-accordion__heading::before {
  content: '\25B6';
  font-size: 0.6rem;
  color: var(--color-primary);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.activity-accordion[open] > .activity-accordion__heading::before {
  transform: rotate(90deg);
}

.activity-accordion[open] > .activity-accordion__heading {
  border-bottom: 1px solid var(--color-border);
}

.activity-years {
  padding: var(--space-xs) var(--space-sm) var(--space-sm);
}

.activity-year {
  margin-bottom: var(--space-md);
}

.activity-year[open] {
  margin-bottom: var(--space-lg);
}

.activity-year__heading {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text-heading);
  padding: var(--space-xs) var(--space-xs) var(--space-xs) var(--space-sm);
  border-left: 3px solid var(--color-primary);
  margin-bottom: var(--space-xs);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  user-select: none;
}

.activity-year__heading::-webkit-details-marker {
  display: none;
}

.activity-year__heading::before {
  content: '▶';
  font-size: 0.7em;
  color: var(--color-primary);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.activity-year[open] > .activity-year__heading::before {
  transform: rotate(90deg);
}

.activity-year .activity-log {
  padding: var(--space-xs) var(--space-md) var(--space-sm);
  list-style: disc;
  padding-left: var(--space-xl);
}

.activity-year .activity-log li {
  font-size: var(--font-size-sm);
  padding: 2px 0;
  line-height: 1.6;
}

.grad-jump-nav {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-xl);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-sm);
}

.grad-jump-nav li a {
  display: inline-block;
  padding: 0.25em 0.75em;
  border: 1px solid var(--color-primary);
  border-radius: 3px;
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}

.grad-jump-nav li a:hover {
  background: var(--color-primary);
  color: #fff;
}

.grad-year {
  margin-bottom: var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
}

.grad-year__heading {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-text-heading);
  background: var(--color-bg-section-alt);
  user-select: none;
  transition: background 0.15s;
}

.grad-year__heading::-webkit-details-marker { display: none; }

.grad-year__heading::before {
  content: '\25B6';
  font-size: 0.6rem;
  color: var(--color-primary);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.grad-year[open] > .grad-year__heading::before {
  transform: rotate(90deg);
}

.grad-year[open] > .grad-year__heading {
  border-bottom: 1px solid var(--color-border);
}

.grad-year > .grad-entry,
.grad-year > div {
  padding: 0 var(--space-md);
}

.grad-entry {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-md);
  border-left: 2px solid var(--color-border);
}

.grad-year[open] > .grad-entry:first-of-type {
  margin-top: var(--space-md);
}

.grad-entry__name {
  font-size: var(--font-size-base);
  font-weight: 700;
  margin-bottom: 0.25em;
}

.grad-entry__title {
  font-size: var(--font-size-base);
  color: var(--color-text-sub);
  font-style: italic;
  margin-bottom: 0.5em;
}

.grad-entry__abstract {
  font-size: var(--font-size-sm);
  line-height: 1.8;
  margin: 0;
}