/* header.css - optimized */

.site-header{
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(11,42,85,.08);
}

.header-inner{
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 80px;
}

/* brand */
.brand{
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
}

.brand-logo{
  width: 46px;      /* スクショ寄せ：でかすぎない */
  height: auto;
}

.brand-text{
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-name{
  font-weight: 800;
  font-size: 14px;
  line-height: 1.1;
  letter-spacing: .01em;
}

.brand-tag{
  font-size: 12px;
  color: var(--muted);
}

/* nav (desktop) */
.site-nav{
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.site-nav a{
  font-size: 13px;
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--ink);
  transition: background .12s ease;
}

.site-nav a:hover{
  background: rgba(11,42,85,.06);
}

.site-nav .nav-cta{
  background: rgba(11,42,85,.08);
  border: 1px solid rgba(11,42,85,.14);
}

/* hamburger */
.nav-toggle{
  display: none;
  margin-left: auto;
  width: 44px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid rgba(11,42,85,.16);
  background: rgba(255,255,255,.95);
}

.nav-toggle-icon{
  position: relative;
  width: 18px;
  height: 12px;
  margin: 0 auto;
}

.nav-toggle-icon span{
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
}

.nav-toggle-icon span:nth-child(1){ top: 0; }
.nav-toggle-icon span:nth-child(2){ top: 5px; }
.nav-toggle-icon span:nth-child(3){ bottom: 0; }

/* mobile */
@media (max-width: 900px){
  .brand-tag{ display: none; }
  .nav-toggle{ display: inline-flex; align-items:center; justify-content:center; }

  .site-nav{
    position: fixed;
    top: 80px;
    left: 12px;
    right: 12px;
    background: rgba(255,255,255,.98);
    border: 1px solid rgba(11,42,85,.10);
    border-radius: 18px;
    padding: 14px;
    display: none;
    flex-direction: column;
    gap: 8px;
    box-shadow: 0 20px 50px rgba(11,42,85,.12);
  }

  body.is-menu-open .site-nav{
    display: flex;
  }

  .site-nav a{
    padding: 12px 12px;
  }
}