.header{background:var(--bg-primary);border-bottom:1px solid var(--border-color);padding:16px 0;position:sticky;top:0;z-index:1000;transition:background-color .3s ease,border-color .3s ease}.header-content{max-width:1200px;margin:0 auto;padding:0 24px;justify-content:space-between;gap:16px}.header-content,.logo,.nav-desktop{display:flex;align-items:center}.logo{text-decoration:none;flex-shrink:0}.logo img{height:60px;width:auto;max-width:100%;object-fit:contain;transition:opacity .3s ease}.logo:hover img{opacity:.85}.nav-desktop{gap:24px;margin-left:auto;margin-right:20px}.tools-dropdown{position:relative}.tools-dropdown-btn{background:0 0;border:1px solid var(--border-color);color:var(--text-secondary);padding:8px 16px;border-radius:6px;font-size:14px;font-weight:500;display:inline-flex;align-items:center;gap:8px;cursor:pointer;transition:border-color .2s ease,color .2s ease;white-space:nowrap;width:145px;justify-content:center}.tools-dropdown-btn:hover{border-color:#9b59b6;color:#9b59b6}.tools-dropdown-btn:focus{outline:2px solid #9b59b6;outline-offset:2px}.dropdown-icon{width:12px;height:12px;transition:transform .2s ease;fill:currentColor}.tools-dropdown.open .dropdown-icon{transform:rotate(180deg)}.tools-dropdown-menu{position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%) translateY(-10px);background:var(--bg-card);border:1px solid var(--border-color);border-radius:8px;box-shadow:0 8px 24px rgba(0,0,0,.15);min-width:200px;display:none;opacity:0;transition:opacity .2s ease,transform .2s ease;z-index:100;overflow:hidden}.tools-dropdown.open .tools-dropdown-menu{display:block;opacity:1;transform:translateX(-50%) translateY(0)}.dropdown-section{padding:12px 0}.dropdown-section:not(:last-child){border-bottom:1px solid var(--border-color)}.dropdown-header{padding:8px 16px;font-size:11px;font-weight:700;text-transform:uppercase;color:var(--text-muted);letter-spacing:.5px}.dropdown-item{display:flex;align-items:center;gap:10px;padding:10px 16px;color:var(--text-secondary);text-decoration:none;font-size:14px;transition:all .15s ease}.dropdown-item:hover{background:var(--bg-secondary);color:var(--text-primary)}.dropdown-item:focus{background:var(--bg-secondary);color:var(--text-primary);outline:2px solid #9b59b6;outline-offset:-2px}.dropdown-item.active{background:#9b59b6;color:#fff}.dropdown-item.active:hover{background:#8e44ad}.dropdown-divider{height:1px;background:var(--border-color);margin:8px 16px}.hamburger-btn,.mobile-menu{display:none}@media (max-width:991px){.nav-desktop{display:none}.header-content{justify-content:space-between}.logo img{height:50px!important}.nav-menu{margin-left:auto}.theme-toggle{display:none!important}}@media (max-width:768px){.header-content{padding:0 16px}.logo img{height:45px!important}}@media (max-width:480px){.header{padding:12px 0}.header-content{padding:0 12px}.logo img{height:40px!important}}@media (max-width:320px){.logo img{height:36px!important}}.bottom-nav{display:none;position:fixed;bottom:0;left:0;right:0;background:var(--bg-primary);border-top:1px solid var(--border-color);z-index:1000;padding:8px 0;padding-bottom:calc(8px + env(safe-area-inset-bottom))}.bottom-nav-items{display:flex;justify-content:space-around;align-items:center;max-width:500px;margin:0 auto}.bottom-nav-item{display:flex;flex-direction:column;align-items:center;gap:4px;padding:8px 12px;text-decoration:none;color:var(--text-secondary);font-size:11px;font-weight:500;transition:color .2s ease;min-width:64px}.bottom-nav-item svg{width:24px;height:24px;stroke-width:1.5;transition:transform .2s ease}.bottom-nav-item:hover{color:var(--text-primary)}.bottom-nav-item:hover svg{transform:scale(1.1)}.bottom-nav-item.active{color:#9b59b6}.bottom-nav-item.active svg{stroke-width:2}@media (max-width:991px){.bottom-nav{display:block}.hamburger-btn,.mobile-menu,.mobile-menu-backdrop{display:none!important}.logo{position:static;transform:none}body{padding-bottom:calc(70px + env(safe-area-inset-bottom))}}[data-theme=dark] .tools-dropdown-menu{box-shadow:0 8px 24px rgba(0,0,0,.4)}[data-theme=dark] .bottom-nav{box-shadow:0-2px 10px rgba(0,0,0,.3)}.bottom-nav-item:focus-visible,.dropdown-item:focus-visible,.tools-dropdown-btn:focus-visible{outline:2px solid #9b59b6;outline-offset:2px}@media (prefers-reduced-motion:reduce){.bottom-nav-item svg,.dropdown-icon,.tools-dropdown-menu{transition:none}}@media (prefers-contrast:high){.tools-dropdown-btn{border-width:2px}.bottom-nav{border-top-width:2px}}