/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
}

body {
  font-family: 'Noto Sans JP', 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  background-color: #f8f8f8;
  color: #333;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity 0.3s ease;
}

a:hover {
  opacity: 0.7;
}

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

/* Link Wrapper for Grid Item */
.grid-item-link {
  display: block;
  text-decoration: none;
  color: inherit;
  border-radius: 8px; /* Match grid-item border-radius */
  outline: none;
}

.grid-item-link:focus-visible {
  box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.5); /* Focus ring */
}


/* Header */
header {
  padding: 3rem 2rem;
  background-color: #fff;
  /* border-bottom is moved to .header-content */
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  max-width: 1400px;
  margin: 0 auto;
  border-bottom: 1px solid black;
  /* 既存のインジケーター上部余白(0.75rem)を参考に、下部にも余白を追加 + 2px */
  padding-bottom: calc(0.75rem + 2px); 
}

.header-left {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.header-logo {
  width: 150px;
  height: auto;
  flex-shrink: 0;
}

.header-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.05em;
}

.header-description {
  font-size: 1rem;
  line-height: 1.8;
  color: #000000;
}

.header-right {
  flex-shrink: 0;
  width: 50%;
  max-width: 700px;
}

.slideshow-container {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 Aspect Ratio */
  background-color: #e0e0e0;
  overflow: hidden;
  border-radius: 4px;
  border: 2px solid #000;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.slide.active {
  opacity: 1;
}

.slide-indicators {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  padding-top: 0.75rem;
}

.indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: #ccc;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.indicator.active {
  background-color: #333;
}


/* Main Content */
main {
  padding: 4rem 2rem;
  background-color: #fff;
}

.main-content {
  display: flex;
  align-items: flex-start;
  gap: 4rem;
  max-width: 1400px;
  margin: 0 auto;
}

.gallery-controls {
  flex: 0 0 auto;
  position: relative;
}

.year-selector-container {
  position: relative;
  display: inline-block;
}

.year-selector {
  background-color: transparent;
  border: none;
  padding: 0;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 1rem;
  -webkit-tap-highlight-color: transparent;
  font-size: 3.6rem; /* 6rem * 0.6 */
  font-weight: 700;
  color: #000;
  transition: opacity 0.2s ease;
}

.year-selector:hover {
  opacity: 0.8;
}

.selector-icon {
  font-size: 1.5rem; /* 2.5rem * 0.6 */
  font-weight: normal;
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  will-change: transform;
}

.year-selector[aria-expanded="true"] .selector-icon {
  transform: rotate(180deg);
}

.year-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: #ffffff;
  z-index: 10;
  list-style: none;
  padding: 0.5rem 0;
  margin-top: 1rem;
  border-radius: 8px;
  overflow: hidden;
}

.year-dropdown.show {
  display: block;
}

@keyframes slideDownFadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.year-option {
    display: block;
    text-align: left;
    padding: 0.1rem 1.5rem;
    cursor: pointer;
    font-size: 3.6rem;
    font-weight: 700;
    color: transparent;
    -webkit-text-stroke: 2px #000;
    text-stroke: 2px #000;
    transition: color 0.2s ease, -webkit-text-stroke-width 0.2s ease;
    line-height: 1.2;
    opacity: 0; /* Initially hidden for animation */
}

.year-dropdown.show .year-option {
  animation: slideDownFadeIn 0.4s ease-out forwards;
}

/* Staggered animation delay */
.year-dropdown.show .year-option:nth-child(1) { animation-delay: 0.04s; }
.year-dropdown.show .year-option:nth-child(2) { animation-delay: 0.08s; }
.year-dropdown.show .year-option:nth-child(3) { animation-delay: 0.12s; }
.year-dropdown.show .year-option:nth-child(4) { animation-delay: 0.16s; }
.year-dropdown.show .year-option:nth-child(5) { animation-delay: 0.20s; }
.year-dropdown.show .year-option:nth-child(6) { animation-delay: 0.24s; }


.year-option:hover {
    color: #888;
    -webkit-text-stroke-width: 0px;
    text-stroke-width: 0px;
}

.gallery-grid {
  flex: 1 1 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}

.no-results {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 1rem;
    font-size: 1.2rem;
    color: #666;
}

.grid-item {
  background-color: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.grid-item-link:hover .grid-item:not(.no-link) {
  transform: translateY(-5px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.grid-item-image-wrapper {
  position: relative;
  overflow: hidden;
  width: 100%;
  padding-top: 75%; /* 4:3 Aspect Ratio */
}

.grid-item-image-wrapper img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.grid-item-link:hover .grid-item:not(.no-link) .grid-item-image-wrapper img {
  transform: scale(1.05);
}

.grid-item-info {
  padding: 1.25rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.work-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: #222;
}

.work-genre {
  font-size: 0.9rem;
  font-weight: 400;
  color: #666;
  margin-bottom: 0.5rem;
}

.work-author {
  font-size: 0.9rem;
  font-weight: 400;
  color: #666;
  margin-top: auto;
  padding-top: 0.5rem;
}


/* Footer */
footer {
  padding: 2rem;
  background-color: #ffffff;
  /* border-top is moved to .footer-container */
  color: #333;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 2rem;
  max-width: 1400px;
  margin: 0 auto;
  border-top: 1px solid black;
  /* copyright部分の余白(2rem)を参考に、上部にも余白を追加 + 2px */
  padding-top: calc(2rem + 2px);
}

.footer-left {
  flex: 1;
  min-width: 300px;
}

.footer-notes p {
  font-size: 1.2rem;
  line-height: 1.8;
  color: #000000;
}

.footer-notes p:not(:last-child) {
    margin-bottom: 1em;
}

.footer-notes strong {
    font-weight: 700;
}

.copyright {
  font-size: 1.2rem;
  color: #000000;
  text-align: center;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid black;
  max-width: 1400px;
  margin-left: auto;
  margin-right: auto;
}

.footer-right {
  flex-shrink: 0;
}

.school-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.35rem;
  font-weight: 400;
}

.school-logo {
  width: 150px;
  height: auto;
}

/* Responsive */
@media (max-width: 992px) {
  .main-content {
    flex-direction: column;
    gap: 2rem;
  }
  .gallery-controls {
    margin-bottom: 2rem;
  }
  .header-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .header-left {
    align-items: center;
  }
  .header-right {
    width: 100%;
    margin-top: 2rem;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  .year-selector {
    font-size: 2.4rem; /* 4rem * 0.6 */
  }
  .year-option {
    font-size: 2.4rem;
  }
  .selector-icon {
    font-size: 0.9rem; /* 1.5rem * 0.6 */
  }
  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
  
  .footer-container {
    flex-direction: column;
    align-items: flex-start;
  }
}