/* ===== header.css — হেডার + মোবাইল মেনু (partials/header.html-এর স্টাইল) ===== */
#header-placeholder{min-height:68px}   /* লোড হওয়ার সময় পেজ লাফায় না */
.site-header{position:sticky;top:0;z-index:20;background:var(--header-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);transition:box-shadow .25s}
.site-header::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:linear-gradient(90deg,#6c5ce7,#ff6b9d,#f5af19)}
.site-header.scrolled{box-shadow:0 6px 24px rgba(0,0,0,.12)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:68px}
.h-left{display:flex;align-items:center;gap:10px;min-width:0}
.header-actions{display:flex;gap:8px;flex:0 0 auto}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--text);text-decoration:none}
.brand-logo{width:40px;height:40px;border-radius:12px;object-fit:cover;box-shadow:0 4px 12px rgba(108,92,231,.35)}
.brand-name{font-size:1.4rem;font-weight:700;letter-spacing:-.3px}
.brand-name span{background:linear-gradient(135deg,#6c5ce7,#ff6b9d);-webkit-background-clip:text;background-clip:text;color:transparent}
.main-nav{display:flex;gap:4px;margin-left:18px}
.nav-link{display:inline-flex;align-items:center;gap:6px;min-height:40px;padding:0 14px;border-radius:24px;background:none;color:var(--text);font-weight:500;font-size:.95rem;text-decoration:none;transition:.2s}
.nav-link .material-icons{font-size:19px}
.nav-link:hover{background:var(--bg)}
.nav-link.active{background:var(--primary-soft);color:var(--primary)}
.menu-btn{display:none}

/* মোবাইল মেনু (drawer) */
.overlay{position:fixed;inset:0;z-index:35;background:rgba(10,12,25,.55);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);opacity:0;visibility:hidden;transition:opacity .3s,visibility 0s .3s}
.overlay.open{opacity:1;visibility:visible;transition-delay:0s}
.drawer{position:fixed;top:0;bottom:0;left:0;z-index:40;width:min(86vw,320px);background:var(--surface);display:flex;flex-direction:column;box-shadow:12px 0 40px rgba(0,0,0,.25);transform:translateX(-102%);visibility:hidden;transition:transform .3s ease,visibility 0s .3s}
.drawer.open{transform:none;visibility:visible;transition-delay:0s}
.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:16px;border-bottom:1px solid var(--border);background:linear-gradient(135deg,rgba(108,92,231,.12),rgba(255,107,157,.1))}
.drawer-nav{display:flex;flex-direction:column;gap:6px;padding:14px;flex:1;overflow-y:auto}
.drawer-sep{height:1px;background:var(--border);margin:8px 6px}
.drawer-link{display:flex;align-items:center;gap:14px;width:100%;min-height:52px;padding:0 14px;border-radius:14px;background:none;color:var(--text);font-size:1rem;font-weight:500;text-align:left;text-decoration:none;transition:.2s}
.drawer-link .material-icons{color:var(--primary)}
.drawer-link .dl-text{flex:1}
.drawer-link .chev{color:var(--muted);font-size:20px}
.drawer-link:hover{background:var(--bg)}
.drawer-link.active{background:var(--primary-soft);color:var(--primary);font-weight:600}
.drawer-foot{padding:14px;border-top:1px solid var(--border)}
.drawer-copy{text-align:center;color:var(--muted);font-size:.85rem;margin-top:8px}

/* ছোট স্ক্রিনে nav লুকিয়ে হ্যামবার্গার মেনু */
@media (max-width:820px){
  .main-nav{display:none}
  .menu-btn{display:inline-flex}
  .header-inner{min-height:60px}
  #header-placeholder{min-height:60px}
  .brand-logo{width:36px;height:36px}
  .brand-name{font-size:1.25rem}
}
@media (min-width:821px){.drawer,.overlay{display:none}}