/* Base */
style.css（フォント・アニメーション・Xアイコン）
/* Base */
body {
  margin: 0;
  font-family: "Zen Kaku Gothic New", sans-serif;
  color: #333;
  background: #ffffff;
  line-height: 1.8;
}

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

h1, h2, h3 {
  margin: 0 0 0.6em;
  font-weight: 600;
}

.section {
  padding: 64px 20px;
  max-width: 1000px;
  margin: 0 auto;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #eef9fb, #eefaf3);
}

.hero-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  max-width: 1100px;
  margin: 0 auto;
  padding: 60px 20px;
}

.hero-text {
  flex: 1 1 420px;
  padding: 20px;
}

.hero-text h1 {
  font-size: 2.5rem;
  color: #2e93a6;
}

.hero-copy {
  font-size: 1.1rem;
  color: #4f7f87;
}

.hero-image {
  flex: 1 1 420px;
  padding: 20px;
}

/* About */
.about p {
  max-width: 720px;
}

/* Activity */
.activity {
  background: #f7fbfc;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.card {
  background: #ffffff;
  border-radius: 16px;
  padding: 26px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
}

.card h3 {
  color: #3aa7a3;
}

/* SNS */
.sns {
  text-align: center;
}

.sns-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  margin-top: 24px;
}

.sns-button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 30px;
  background: linear-gradient(135deg, #5fc6d1, #6bd3a5);
  color: #ffffff;
  text-decoration: none;
  border-radius: 999px;
  font-size: 0.95rem;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.sns-button:hover {
  opacity: 0.85;
  transform: translateY(-2px);
}

.sns-button.official {
  background: linear-gradient(135deg, #9fb7c6, #8fbfae);
}

/* X Icon (SVG) */
.x-icon {
  width: 16px;
  height: 16px;
  background-color: currentColor;
  mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path fill="black" d="M18.244 2H21l-6.4 7.334L22 22h-6.828l-5.344-7.11L3.8 22H1l6.9-7.907L2 2h6.828l4.838 6.432L18.244 2Z"/></svg>') no-repeat center / contain;
}

/* Footer */
.footer {
  background: #eef7f8;
  text-align: center;
  padding: 30px 20px;
}

.footer .note {
  font-size: 0.75rem;
  color: #777;
  margin-bottom: 10px;
}

.footer .copyright {
  font-size: 0.85rem;
  color: #666;
}

/* Animations */
.fade-in {
  animation: fadeIn 0.8s ease both;
}

.slide-up {
  animation: slideUp 0.8s ease both;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Utility */
.pc-only {
  display: none;
}

@media (min-width: 768px) {
  .pc-only {
    display: inline;
  }
}