/* ============================================================
   header.css — ヘッダー・ナビゲーション
   ============================================================ */

header.site-header{
  position:sticky; top:0; z-index:100;
  background:rgba(255,255,255,0.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid #eef0f5;
}
.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  padding:16px 24px;
  max-width:1200px; margin:0 auto;
}

.logo-icon{
  width:70px; height:auto;
  display:flex; align-items:center; justify-content:center;
}

nav.main-nav{display:flex; align-items:center; gap:32px;}
nav.main-nav a.nav-link{
  font-size:13.5px; font-weight:600; color:var(--text-main);
  position:relative; padding:4px 0;
}

nav.main-nav a.nav-link:not(.btn-entry)::after{
  content:""; position:absolute; left:0; bottom:-2px; width:0; height:2px;
  background:var(--blue); transition:width 0.25s ease;
}
nav.main-nav a.nav-link:not(.btn-entry):hover::after{width:100%;}

nav.main-nav a.nav-link.btn-entry{
  background:var(--blue);
  color:#fff !important;
  font-weight:700;
  font-size:13.5px;
  letter-spacing:0.04em;
  padding:14px 28px;
  border-radius:999px;
  white-space:nowrap;
  flex-shrink:0;
  display:inline-block;
  line-height:1;
  transition:transform 0.2s ease, box-shadow 0.2s ease;
}
.btn-entry:hover{transform:translateY(-2px); box-shadow:0 8px 18px rgba(47,111,237,0.4);}

.nav-toggle{display:none; flex-direction:column; gap:5px; background:none; border:none; cursor:pointer;}
.nav-toggle span{width:22px; height:2px; background:var(--navy);}

/* ---------- Responsive ---------- */
@media(max-width:960px){
  nav.main-nav{
    position:fixed; top:64px; left:0; right:0; background:#fff;
    flex-direction:column; align-items:flex-start; gap:0; padding:8px 24px 16px;
    box-shadow:0 12px 20px rgba(0,0,0,0.06);
    transform:translateY(-130%); opacity:0; transition:all 0.3s ease; pointer-events:none;
  }
  nav.main-nav.open{transform:translateY(0); opacity:1; pointer-events:auto;}
  nav.main-nav a.nav-link{padding:12px 0; width:100%; border-bottom:1px solid #f0f1f4;}
  .btn-entry{margin-top:12px;}
  .nav-toggle{display:flex;}
}