/* ── NAV ── */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:200;
  height:72px;display:flex;align-items:center;justify-content:space-between;
  padding:0 var(--pad-x);
  background:transparent;
  mix-blend-mode:normal;
  transition:background 0.4s ease, backdrop-filter 0.4s ease, box-shadow 0.4s ease;
}
.nav.scrolled{
  background:rgba(255,255,255,0.80);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  box-shadow:0 1px 0 rgba(0,0,0,0.06);
}
.nav-logo{
  display:flex;align-items:center;
  z-index:201;
  line-height:1;
}
.nav-logo-img{
  height:36px;width:auto;
  object-fit:contain;
  position:absolute;
  transition:opacity 0.35s ease;
}
.nav-logo{
  position:relative;
  height:36px;
  width:60px;
}
.nav-logo-default{ opacity:1; }
.nav-logo-overlay{ opacity:0; }
.nav-menu-open .nav-logo-default{ opacity:0; }
.nav-menu-open .nav-logo-overlay{ opacity:1; }

.nav-right{
  display:flex;align-items:center;gap:24px;
  z-index:201;
}
.nav-talk{
  font-size:13px;font-weight:600;
  color:var(--black);letter-spacing:0.02em;
  transition:color 0.3s;
  opacity:0.75;
}
.nav-talk:hover{opacity:1;}
.nav-menu-open .nav-talk{color:rgba(255,255,255,0.6);}
.nav-menu-open .nav-talk:hover{color:var(--white);}

/* Hamburger — two lines style */
.hamburger{
  display:flex;flex-direction:column;gap:6px;
  cursor:pointer;padding:8px;
  z-index:201;
}
.hamburger span{
  display:block;width:28px;height:1.5px;
  background:var(--black);
  transition:transform 0.4s cubic-bezier(0.77,0,0.18,1),
             opacity 0.3s,
             background 0.3s;
  transform-origin:center;
}
.hamburger span:nth-child(3){display:none;} /* two-line style */
.nav-menu-open .hamburger span{background:var(--white);}
.nav-menu-open .hamburger span:nth-child(1){transform:translateY(7.5px) rotate(45deg);}
.nav-menu-open .hamburger span:nth-child(2){transform:translateY(-7.5px) rotate(-45deg);}

/* ── FULL-SCREEN OVERLAY MENU ── */
.overlay{
  position:fixed;inset:0;z-index:199;
  background:#0d0d0d;
  display:flex;flex-direction:column;
  padding:120px var(--pad-x) 60px;
  transform:translateY(-100%);
  transition:transform 0.6s cubic-bezier(0.77,0,0.18,1);
  overflow:hidden;
}
.overlay.open{transform:none;}

.overlay-links{
  display:flex;flex-direction:column;
  gap:0;flex:1;
  justify-content:center;
}
.overlay-link{
  font-family:var(--font-head);
  font-size:clamp(36px,7vw,88px);
  font-weight:900;
  letter-spacing:-3px;
  line-height:1.05;
  color:rgba(255,255,255,0.12);
  transition:color 0.2s;
  cursor:pointer;
  display:flex;align-items:center;gap:20px;
  border-top:1px solid rgba(255,255,255,0.07);
  padding:16px 0;
  text-decoration:none;
}
.overlay-link:last-child{border-bottom:1px solid rgba(255,255,255,0.07);}
.overlay-link:hover{color:var(--white);}
.overlay-link-num{
  font-size:12px;font-weight:600;font-family:var(--font-body);
  color:rgba(255,255,255,0.2);letter-spacing:0.08em;
  align-self:flex-start;margin-top:12px;
  transition:color 0.2s;
  min-width:28px;
}
.overlay-link:hover .overlay-link-num{color:rgba(255,255,255,0.5);}

.overlay-bottom{
  display:flex;align-items:flex-end;justify-content:space-between;
  flex-wrap:wrap;gap:24px;
  margin-top:40px;
  padding-top:32px;
  border-top:1px solid rgba(255,255,255,0.07);
}
.overlay-meta{display:flex;flex-direction:column;gap:8px;}
.overlay-meta a{
  font-size:13px;color:rgba(255,255,255,0.35);
  transition:color 0.2s;
}
.overlay-meta a:hover{color:var(--white);}
.overlay-socials{display:flex;gap:20px;}
.overlay-socials a{
  font-size:12px;font-weight:700;letter-spacing:0.08em;
  text-transform:uppercase;color:rgba(255,255,255,0.3);
  transition:color 0.2s;
}
.overlay-socials a:hover{color:var(--white);}

/* stagger animation for links */
.overlay-link{
  opacity:0;transform:translateY(30px);
  transition:color 0.2s,
             opacity 0.5s cubic-bezier(0.22,1,0.36,1),
             transform 0.5s cubic-bezier(0.22,1,0.36,1);
}
.overlay.open .overlay-link{opacity:1;transform:none;}
.overlay.open .overlay-link:nth-child(1){transition-delay:0.08s;}
.overlay.open .overlay-link:nth-child(2){transition-delay:0.14s;}
.overlay.open .overlay-link:nth-child(3){transition-delay:0.20s;}
.overlay.open .overlay-link:nth-child(4){transition-delay:0.26s;}

.overlay-bottom{
  opacity:0;transform:translateY(20px);
  transition:opacity 0.5s 0.35s ease, transform 0.5s 0.35s ease;
}
.overlay.open .overlay-bottom{opacity:1;transform:none;}