body {
  margin: 0;
  font-family: 'Noto Sans JP', sans-serif;
  line-height: 1.7;
  color: #333;
}

.container {
  width: 90%;
  max-width: 1100px;
  margin: 0 auto;
}

/* =========================
   Header
========================= */
.site-header {
  background: #fff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.logo {
  height: 40px;
}

/* --- Navigation --- */
.nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav a {
  text-decoration: none;
  color: #333;
  font-weight: bold;
}

/* =========================
   SNS アイコン
========================= */

.social-icons {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.sns-icon {
  width: 22px;
  height: 22px;
  display: block;
  filter: brightness(0.3);
  transition: 0.2s;
}

.sns-icon:hover {
  filter: brightness(0.0);
}

/* 既存のハンバーガーの下にアイコンも縮小されず残したいので調整 */
@media (max-width: 768px) {
  .social-icons {
    gap: 0.8rem;
  }

  .sns-icon {
    width: 20px;
    height: 20px;
  }
}

/* --- ハンバーガーボタン --- */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.hamburger span {
  display: block;
  width: 26px;
  height: 3px;
  background: #333;
}

/* =========================
   Hero Section
========================= */
.hero {
  position: relative;
  height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-align: center;
  overflow: hidden;
}

.hero-slider {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-slider .slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1.5s ease-in-out;
}

.hero-slider .slide.active {
  opacity: 1;
}

.hero-content {
  z-index: 2;
  background: rgba(0,0,0,0.4);
  padding: 2rem;
  border-radius: 8px;
}

.btn-primary {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.8rem 1.5rem;
  background: #0078ff;
  color: #fff;
  border-radius: 5px;
  text-decoration: none;
}

/* =========================
   Section
========================= */
.section {
  padding: 4rem 0;
}

.section h2 {
  text-align: center;
  margin-bottom: 2rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.feature-item img {
  width: 100%;
  border-radius: 8px;
}

.contact {
  text-align: center;
}

.btn-secondary {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  border: 2px solid #0078ff;
  color: #0078ff;
  border-radius: 5px;
  text-decoration: none;
  margin-top: 1rem;
}

/* =========================
   Footer
========================= */
.footer {
  background: #f4f4f4;
  text-align: center;
  padding: 1rem 0;
  font-size: 0.9rem;
}

/* =========================
   Responsive (スマホ対応)
========================= */
@media (max-width: 768px) {

  /* ナビゲーション → ハンバーガーで開閉 */
  .nav ul {
    display: none;
    flex-direction: column;
    background: #fff;
    padding: 1rem;
    position: absolute;
    top: 60px;
    right: 1rem;
    width: 180px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  }

  .nav ul.open {
    display: flex;
  }

  .hamburger {
    display: flex;
  }
}