body {
  font-family: 'Noto Sans JP', sans-serif;
  margin: 0;
  background: linear-gradient(180deg, #f8fbff 0%, #e6f2ff 100%);
  color: #333;
  line-height: 1.8;
  overflow-x: hidden;
}

/* ===================== Hero Header ===================== */
.hero {
  position: relative;
  background: linear-gradient(120deg, #6dd5fa, #2980b9, #2b5876);
  background-size: 200% 200%;
  color: white;
  text-align: center;
  padding: 100px 20px 90px;
  animation: bgMove 10s ease-in-out infinite alternate;
  box-shadow: 0 4px 25px rgba(0,0,0,0.2);
}

@keyframes bgMove {
  0% { background-position: 0% 50%; }
  100% { background-position: 100% 50%; }
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 60px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.9), #fff);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
}

.hero h1 {
  font-size: 2.8em;
  margin-bottom: 12px;
  letter-spacing: 1.5px;
  font-weight: 700;
  text-shadow: 0 2px 10px rgba(0,0,0,0.25);
}

.hero p {
  font-size: 1.1em;
  opacity: 0.9;
}

/* ===================== Intro ===================== */
.intro {
  text-align: center;
  padding: 80px 20px 50px;
  animation: fadeIn 1.2s ease;
}

.intro h2 {
  font-size: 2em;
  margin-bottom: 25px;
  color: #2980b9;
  font-weight: 700;
}

.intro p {
  max-width: 750px;
  margin: 0 auto;
  color: #444;
  line-height: 1.9;
  font-size: 1.05em;
}

/* ===================== Photo Highlight ===================== */
.photo-highlight {
  text-align: center;
  margin: 60px 0 80px;
  position: relative;
}

.photo-highlight img {
  width: 85%;
  max-width: 880px;
  border-radius: 16px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.15);
  transition: transform 0.5s ease, box-shadow 0.5s ease;
  cursor: pointer;
}

.photo-highlight img:hover {
  transform: scale(1.02);
  box-shadow: 0 16px 40px rgba(0,0,0,0.25);
}

.photo-caption {
  margin-top: 15px;
  font-size: 0.95em;
  color: #666;
  font-style: italic;
}

/* ===================== Gallery ===================== */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  padding: 0 40px 100px;
  max-width: 1200px;
  margin: 0 auto;
}

.photo-card {
  background: white;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
  transition: all 0.4s ease;
  cursor: pointer;
  transform: translateY(0);
}

.photo-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.photo-card img {
  width: 100%;
  height: 210px;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.photo-card:hover img {
  transform: scale(1.05);
}

.caption {
  padding: 15px;
  font-size: 0.92em;
  color: #555;
  border-top: 1px solid #eee;
}

/* ===================== Message ===================== */
.message {
  background: linear-gradient(180deg, #eaf7ff 0%, #ffffff 100%);
  padding: 80px 20px;
  text-align: center;
  border-top: 2px solid #d6eeff;
}

.message h3 {
  font-size: 1.8em;
  margin-bottom: 30px;
  color: #2b5876;
  letter-spacing: 1px;
}

.message p {
  max-width: 750px;
  margin: 0 auto;
  color: #444;
  font-size: 1.05em;
  line-height: 1.9;
}

/* ===================== Back Button ===================== */
.back-container {
  text-align: center;
  padding: 60px 0 40px;
}

.back-button {
  display: inline-block;
  background: linear-gradient(90deg, #2980b9, #6dd5fa);
  color: white;
  padding: 14px 34px;
  border-radius: 40px;
  text-decoration: none;
  font-weight: bold;
  box-shadow: 0 6px 18px rgba(0,0,0,0.15);
  transition: all 0.4s ease;
}

.back-button:hover {
  background: linear-gradient(90deg, #6dd5fa, #2980b9);
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}

/* ===================== Footer ===================== */
footer {
  text-align: center;
  padding: 25px;
  background: #132d32;
  color: white;
  font-size: 0.95em;
  letter-spacing: 0.5px;
}

/* ===================== Modal (Full Image) ===================== */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal img {
  max-width: 90%;
  max-height: 85%;
  border-radius: 10px;
  animation: zoomIn 0.5s ease;
}

.close {
  position: absolute;
  top: 40px;
  right: 50px;
  color: white;
  font-size: 40px;
  cursor: pointer;
  transition: color 0.3s;
}
.close:hover { color: #6dd5fa; }

/* ===================== Animations ===================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes zoomIn {
  from { transform: scale(0.8); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* ===================== Responsive ===================== */
@media (max-width: 768px) {
  .hero h1 { font-size: 2em; }
  .intro h2 { font-size: 1.6em; }
  .photo-highlight img { width: 95%; }
  .gallery { padding: 0 20px 60px; gap: 20px; }
}