* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --yellow: #f7c600;
  --yellow-dark: #d9ad00;
  --text: #5f5f5f;
  --dark: #333333;
  --white: #ffffff;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.9;
  letter-spacing: 0.06em;

  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  height: 130px;
  padding: 24px 6vw;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--white);
}

.logo img {
  width: 280px;
  max-width: 48vw;
  display: block;
}

.nav {
  display: flex;
  align-items: center;
  gap: 42px;
  font-size: 14px;
  font-weight: 600;
  color: var(--dark);
}

.nav a {
  padding: 12px 0;
  position: relative;
}

.nav a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--yellow);
}

.contact-link {
  background: var(--yellow);
  color: var(--white);
  padding: 12px 24px !important;
  border-radius: 999px;
}


/* トップ写真を変更する方法：
   images/hero.jpg を好きな写真に差し替えるだけでOKです。
   推奨サイズ：横長 1800px × 900px 前後。
   ファイル名は hero.jpg のままにしてください。 */

.hero {
  min-height: 560px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero-slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0;
  animation: heroSlideshow 24s infinite;
}

.slide-1 {
  background-image: url("images/hero1.jpg");
  animation-delay: 0s;
}

.slide-2 {
  background-image: url("images/hero2.jpg");
  animation-delay: 6s;
}

.slide-3 {
  background-image: url("images/hero3.jpg");
  animation-delay: 12s;
}

.slide-4 {
  background-image: url("images/hero4.jpg");
  animation-delay: 18s;
}

@keyframes heroSlideshow {
  0% {
    opacity: 0;
    transform: scale(1);
  }

  8% {
    opacity: 1;
  }

  25% {
    opacity: 1;
  }

  33% {
    opacity: 0;
    transform: scale(1.04);
  }

  100% {
    opacity: 0;
  }
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(255,255,255,0.96) 0%,
    rgba(255,255,255,0.84) 42%,
    rgba(255,255,255,0.15) 72%
  );
  z-index: 1;
}

.hero-content {
  width: min(1120px, 88vw);
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero h1 {
  font-size: clamp(36px, 5vw, 62px);
  line-height: 1.6;
  font-weight: 500;
  color: #666666;
  letter-spacing: 0.18em;
  margin-bottom: 24px;
}

.hero p {
  max-width: 590px;
  font-size: 15px;
  color: #333333;
  margin-bottom: 38px;
}

.button,
.contact-button {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  background: var(--yellow);
  color: var(--white);
  border-radius: 999px;
  padding: 15px 28px;
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 12px 30px rgba(247, 198, 0, 0.28);
}

.button.small {
  padding: 13px 24px;
  margin-top: 28px;
}

.section {
  width: min(1120px, 88vw);
  margin: 88px auto;
}

.section-title {
  text-align: center;
  margin-bottom: 56px;
}

.section-title h2 {
  font-size: 28px;
  color: var(--dark);
  font-weight: 500;
  letter-spacing: 0.22em;
}

.section-title span {
  display: block;
  width: 28px;
  height: 2px;
  background: var(--yellow);
  margin: 22px auto 0;
}

.activity-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 54px;
  text-align: center;
}

.activity-card .icon {
  font-size: 52px;
  color: var(--yellow);
  margin-bottom: 24px;
  line-height: 1;
}

.activity-card h3 {
  font-size: 18px;
  color: var(--dark);
  margin-bottom: 20px;
}

.activity-card p {
  font-size: 14px;
  margin-bottom: 22px;
}

.activity-card a {
  color: var(--yellow-dark);
  font-weight: 700;
  font-size: 14px;
}

.instagram {
  display: grid;
  grid-template-columns: 0.8fr 1.4fr;
  gap: 64px;
  align-items: center;
  margin-top: 120px;
}

.instagram-text h2 {
  font-size: 34px;
  color: var(--dark);
  letter-spacing: 0.16em;
  margin-bottom: 20px;
}

.insta-icon {
  font-size: 56px;
  color: var(--yellow);
  line-height: 1;
  margin-bottom: 16px;
}

.instagram-text p {
  font-size: 15px;
}

.insta-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.photo-card {
  aspect-ratio: 1 / 1;
  border-radius: 4px;
  background-size: cover;
  background-position: center;
}

.photo-1 { background-image: url("https://images.unsplash.com/photo-1500530855697-b586d89ba3ee?auto=format&fit=crop&w=600&q=80"); }
.photo-2 { background-image: url("https://images.unsplash.com/photo-1525105128675-9e5702e3b941?auto=format&fit=crop&w=600&q=80"); }
.photo-3 { background-image: url("https://images.unsplash.com/photo-1541625602330-2277a4c46182?auto=format&fit=crop&w=600&q=80"); }
.photo-4 { background-image: url("https://images.unsplash.com/photo-1506744038136-46273834b3fb?auto=format&fit=crop&w=600&q=80"); }
.photo-5 { background-image: url("https://images.unsplash.com/photo-1485965120184-e220f721d03e?auto=format&fit=crop&w=600&q=80"); }
.photo-6 { background-image: url("https://images.unsplash.com/photo-1473773508845-188df298d2d1?auto=format&fit=crop&w=600&q=80"); }

.contact-section {
  margin-top: 120px;
  background: linear-gradient(135deg, #ffd21a, #f5bf00);
  color: var(--white);
  padding: 54px 6vw;
}

.contact-inner {
  width: min(1120px, 100%);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 32px;
}

.mail-icon {
  font-size: 42px;
  line-height: 1;
  margin-bottom: 8px;
}

.contact-section h2 {
  font-size: 22px;
  margin-bottom: 6px;
  letter-spacing: 0.1em;
}

.contact-section p {
  font-size: 14px;
}

.contact-button {
  background: var(--white);
  color: var(--yellow-dark);
  box-shadow: none;
  white-space: nowrap;
}

.footer {
  width: min(1120px, 88vw);
  margin: 42px auto 24px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: center;
  color: #999999;
  font-size: 12px;
}

.footer-logo img {
  width: 160px;
  opacity: 0.7;
}

.footer nav {
  display: flex;
  gap: 28px;
}

.footer p {
  text-align: right;
}

@media (max-width: 900px) {
  .site-header {
    height: auto;
    padding: 22px 5vw;
    flex-direction: column;
    gap: 18px;
    align-items: flex-start;
  }

  .logo img {
    width: 230px;
  }

  .nav {
    width: 100%;
    gap: 18px;
    flex-wrap: wrap;
    font-size: 13px;
  }

  .hero {
    min-height: 560px;
  }

  .hero-overlay {
    background: linear-gradient(
      180deg,
      rgba(255,255,255,0.96) 0%,
      rgba(255,255,255,0.78) 58%,
      rgba(255,255,255,0.20) 100%
    );
  }

  .hero h1 {
    font-size: 34px;
    letter-spacing: 0.1em;
  }

  .activity-grid,
  .instagram {
    grid-template-columns: 1fr;
  }

  .activity-grid {
    gap: 48px;
  }

  .insta-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer {
    grid-template-columns: 1fr;
  }

  .footer nav {
    flex-wrap: wrap;
  }

  .footer p {
    text-align: left;
  }
}