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var(--border-subtle)}.donate-btn{display:flex;align-items:center;gap:8px;padding:10px 24px!important;font-size:14px;font-weight:600}.donate-btn:hover{transform:translateY(-1px);box-shadow:var(--shadow-accent)}.header-mobile-menu-btn{display:none}.header-about-desktop{display:inline-flex}.header-mobile-backdrop{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);z-index:98;animation:fadeIn .2s ease}.header-mobile-menu{display:none;position:fixed;top:56px;right:0;width:280px;max-height:calc(100vh - 56px);background:var(--bg-secondary);border-left:1px solid var(--border-subtle);border-bottom:1px solid var(--border-subtle);box-shadow:var(--shadow-xl);z-index:99;overflow-y:auto;animation:slideInRight .25s cubic-bezier(.16,1,.3,1)}@keyframes slideInRight{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}.header-mobile-menu-section{padding:16px;border-bottom:1px solid var(--border-subtle)}.header-mobile-menu-section:last-child{border-bottom:none}.header-mobile-menu-title{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);margin-bottom:10px}.header-mobile-menu-item{display:flex;align-items:center;gap:12px;width:100%;padding:12px 14px;background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-md);color:var(--text-secondary);font-family:var(--font-sans);font-size:14px;font-weight:500;cursor:pointer;transition:all var(--transition-fast);margin-bottom:6px;text-align:left}.header-mobile-menu-item:last-child{margin-bottom:0}.header-mobile-menu-item:hover{background:var(--bg-surface-hover);border-color:var(--border-medium)}.header-mobile-menu-item.active{background:var(--accent-subtle);border-color:var(--border-accent);color:var(--text-accent)}.header-mobile-menu-item svg{flex-shrink:0}.header-mobile-zoom{display:flex;align-items:center;gap:8px;padding:10px 14px;background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-md)}.header-mobile-zoom .zoom-value{flex:1;text-align:center;font-size:14px;font-weight:700;color:var(--text-secondary);font-variant-numeric:tabular-nums}.header-mobile-zoom .icon-btn{width:32px;height:32px}.header-mobile-compression{display:flex;align-items:center;gap:10px;padding:10px 14px;background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-md)}.header-mobile-compression label{font-size:13px;font-weight:600;color:var(--text-secondary);white-space:nowrap}.header-mobile-compression select{flex:1;padding:6px 10px;background:var(--bg-card);border:1px solid var(--border-medium);border-radius:var(--radius-sm);color:var(--text-primary);font-family:var(--font-sans);font-size:13px;cursor:pointer;outline:none}.header-desktop-only,.header-tablet-up{display:flex}@media(max-width:768px){.header-mobile-menu-btn{display:inline-flex}.header-desktop-only{display:none!important}.header-about-desktop{display:none}.header-mobile-backdrop,.header-mobile-menu{display:block}}@media(max-width:640px){.header-tablet-up{display:none!important}.header-export-btn span{display:none}.header-mobile-menu{width:100%;max-width:320px}}@media(max-width:480px){.header-mobile-menu{width:calc(100vw - 16px);max-width:none;right:8px;top:52px;max-height:calc(100vh - 52px);border-radius:0 0 var(--radius-lg) var(--radius-lg)}.header-mobile-menu-section{padding:12px}.header-mobile-menu-item{padding:10px 12px;font-size:13px}.header-mobile-zoom,.header-mobile-compression{padding:8px 12px}}.header{position:relative;z-index:15}