/* =========================================================
   MELBET — header.css
   ========================================================= */
.site-header{
  position:sticky;top:0;z-index:200;
  background:rgba(22,22,22,.88);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--color-border);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:1.2rem;height:var(--header-h)}
.brand{display:flex;align-items:center;gap:.6rem}
.brand-logo{height:40px;width:auto;flex:none;object-fit:contain}
@media (max-width:640px){.brand-logo{height:34px}}
.brand-mark{
  width:40px;height:40px;border-radius:11px;background:var(--grad-primary);
  display:flex;align-items:center;justify-content:center;box-shadow:0 6px 16px rgba(255,184,3,.45);
}
.brand-mark svg{width:24px;height:24px}
.brand-name{font-family:var(--font-heading);font-weight:800;font-size:1.35rem;color:#fff;letter-spacing:-.02em}
.brand-name em{font-style:normal;color:var(--color-accent)}
.brand-tag{display:block;font-size:.62rem;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:var(--color-text-faint)}

.main-nav ul{display:flex;align-items:center;gap:.3rem}
.main-nav a{
  display:inline-block;padding:.55rem .85rem;border-radius:9px;
  font-family:var(--font-heading);font-weight:600;font-size:.92rem;color:var(--color-text-muted);
  position:relative;
}
.main-nav a:hover{color:#fff;background:rgba(255,255,255,.05)}
.main-nav a.active{color:#fff;background:var(--color-primary-soft)}
.main-nav a.active::after{
  content:"";position:absolute;left:.85rem;right:.85rem;bottom:4px;height:2px;border-radius:2px;
  background:var(--grad-accent);
}
.header-actions{display:flex;align-items:center;gap:1.1rem}

/* burger */
.burger{display:none;flex-direction:column;gap:5px;padding:.5rem}
.burger span{width:24px;height:2px;background:#fff;border-radius:2px;transition:transform .25s ease,opacity .25s ease}
.burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.open span:nth-child(2){opacity:0}
.burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.mobile-menu{
  position:fixed;inset:0;background:var(--color-bg);z-index:120;
  padding:calc(var(--header-h) + 12px) 22px 22px;overflow-y:auto;
  opacity:0;visibility:hidden;transition:opacity .25s ease,visibility .25s ease;
}
.mobile-menu.open{opacity:1;visibility:visible}
.mobile-menu ul{display:flex;flex-direction:column;gap:.4rem}
.mobile-menu a{
  display:flex;align-items:center;justify-content:space-between;
  padding:1rem 1.1rem;border-radius:12px;background:var(--color-surface);
  font-family:var(--font-heading);font-weight:600;color:var(--color-white);font-size:var(--text-md);
  border:1px solid var(--color-border);
}
.mobile-menu a.active{background:var(--color-accent-soft);border-color:rgba(255,184,3,.5)}
.mobile-menu .mm-actions{display:grid;grid-template-columns:1fr 1fr;gap:.8rem;margin-top:1.4rem}

@media (max-width:980px){
  .main-nav,.header-actions .btn{display:none}
  .burger{display:flex}
}
@media (min-width:981px){
  .burger,.mobile-menu{display:none}
}
@media (max-width:420px){
  .brand-logo{height:30px}
  .header-actions .btn{padding:.5rem .8rem;font-size:.72rem}
  .header-inner{gap:.6rem}
}