/* --- 基本設定 --- */
body {
  font-family: 'Noto Sans JP', sans-serif;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
.serif { font-family: 'Playfair Display', serif; }
.gradient-footer { background: linear-gradient(90deg, #4facfe 0%, #00f2fe 30%, #f093fb 100%); }

/* --- Safari対策 --- */
* {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

/* --- アニメーション --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  -webkit-transform: translateY(30px);
  transition: opacity 1.2s cubic-bezier(0.22, 1, 0.36, 1), transform 1.2s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.active {
  opacity: 1;
  transform: translateY(0);
  -webkit-transform: translateY(0);
}

/* --- ハンバーガー --- */
#menu-btn {
  width: 32px;
  height: 20px;
  position: relative;
  cursor: pointer;
  z-index: 100;
  -webkit-appearance: none;
  appearance: none;
}

#menu-btn span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: #1a1a1a;
  transition: all 0.4s ease-in-out;
}

#line1 { top: 0; }
#line2 { top: 50%; width: 60%; left: auto; right: 0; }
#line3 { top: 100%; }

.menu-open #line1 {
  transform: translateY(10px) rotate(45deg);
  -webkit-transform: translateY(10px) rotate(45deg);
}
.menu-open #line2 { opacity: 0; }
.menu-open #line3 {
  transform: translateY(-10px) rotate(-45deg);
  -webkit-transform: translateY(-10px) rotate(-45deg);
}

/* --- PCナビ（強制安定） --- */
.header-nav {
  display: flex;
  flex-shrink: 0;
}

/* --- モバイルメニュー --- */
#mobile-menu {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100vh;
  z-index: 90;
  display: flex;
  flex-direction: column !important;
  align-items: center;
  justify-content: center;
  background-color: #ffffff !important;
  transform: translateX(100%);
  -webkit-transform: translateX(100%);
  transition: transform 0.4s ease;
}

#mobile-menu.active {
  transform: translateX(0);
  -webkit-transform: translateX(0);
}

.mobile-link {
  font-size: 1.5rem;
  letter-spacing: 0.15em;
  padding: 1.2rem 0;
  width: 100%;
  text-align: center;
  color: #1a1a1a;
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

/* --- ここが最重要（Safariバグ対策） --- */
@media screen and (max-width: 820px) {
  .header-nav {
    display: none !important;
  }
  #menu-btn {
    display: block !important;
  }
}

@media screen and (min-width: 821px) {
  #mobile-menu {
    display: none !important;
  }
  #menu-btn {
    display: none !important;
  }
}