.app-header{
  position:sticky;
  top:0;
  z-index:100;
  backdrop-filter:blur(14px);
  background:rgba(248,250,252,.88);
  border-bottom:1px solid rgba(219,227,238,.92);
  color:var(--theme-text);
}

.app-header__inner{
  max-width:1400px;
  margin:0 auto;
  padding:14px 20px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
}

.app-header__brand{
  display:flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  color:var(--theme-text);
}

.app-header__logo{
  font-size:26px;
  font-weight:800;
  letter-spacing:-.04em;
}

.app-header__logo-accent{
  color:var(--theme-accent);
}

.app-header__meta{
  display:flex;
  flex-direction:column;
  gap:2px;
}

.app-header__title{
  font-size:14px;
  font-weight:800;
  letter-spacing:.08em;
  text-transform:uppercase;
}

.app-header__subtitle{
  font-size:12px;
  color:var(--theme-muted);
}

.app-header__nav{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:flex-end;
  gap:8px;
  row-gap:10px;
}

.app-header__link,
.app-header__theme-toggle,
.app-header__logout{
  text-decoration:none;
  border:1px solid var(--theme-border);
  background:var(--theme-surface);
  color:var(--theme-text);
  border-radius:12px;
  padding:10px 14px;
  font:inherit;
  font-size:14px;
  font-weight:700;
  cursor:pointer;
  transition:transform .16s ease,border-color .16s ease,background .16s ease,color .16s ease;
}

.app-header__link:hover,
.app-header__theme-toggle:hover,
.app-header__logout:hover{
  transform:translateY(-1px);
  border-color:var(--theme-accent);
}

.app-header__link.is-active{
  background:var(--theme-accent);
  color:#111827;
  border-color:var(--theme-accent);
}

.app-header__logout{
  background:linear-gradient(135deg, rgba(249,115,22,.16), rgba(249,115,22,.08));
  color:var(--theme-accent-strong);
  border-color:rgba(249,115,22,.45);
  font-weight:800;
  min-width:108px;
}

.app-header__theme-toggle{
  min-width:92px;
  justify-content:center;
}

@media (max-width: 780px){
  .app-header__inner{
    padding:12px 14px;
    flex-direction:column;
    align-items:flex-start;
  }

  .app-header__nav{
    width:100%;
    justify-content:flex-start;
  }

  .app-header__link,
  .app-header__theme-toggle,
  .app-header__logout{
    min-height:44px;
  }

  .app-header__theme-toggle{
    min-width:0;
  }

  .app-header__logout{
    margin-left:auto;
  }
}