:root{--bg-app: #050505;--bg-panel: #0a0a0e;--border: rgba(255,255,255,.08);--text-main: #f0f0f0;--text-muted: #9ca3af;--emerald: #00f5d4;--purple: #9d4edd;--sidebar-width: 260px;--sidebar-width-collapsed: 80px}*{box-sizing:border-box}html,body{margin:0;height:100%;background:var(--bg-app);color:var(--text-main);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}body{display:flex}.sidebar{width:var(--sidebar-width);background:var(--bg-panel);border-right:1px solid var(--border);padding:20px;display:flex;flex-direction:column;transition:width .25s ease;position:relative;white-space:nowrap;overflow-y:auto;flex-shrink:0}.sidebar-header{display:flex;align-items:center;justify-content:space-between;height:40px;margin-bottom:20px}.brand{display:flex;align-items:center;gap:10px;font-weight:800;background:linear-gradient(to right,var(--purple),var(--emerald));-webkit-background-clip:text;background-clip:text;color:transparent}.brand i{color:var(--emerald)}.sidebar-toggle-btn{color:var(--text-muted);cursor:pointer;font-size:.95rem;padding:6px;border-radius:6px;transition:.2s;-webkit-user-select:none;user-select:none}.sidebar-toggle-btn:hover{color:#fff;background:#ffffff14}.nav-list{display:flex;flex-direction:column;gap:6px;list-style-type:none;padding:0}.nav-item{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:8px;color:var(--text-muted);text-decoration:none;transition:.2s}.nav-item i{width:20px;text-align:center}.nav-item:hover{color:#fff;background:#ffffff0f}.nav-item.active{color:var(--emerald);background:#00f5d41f;font-weight:700}.has-submenu:after{content:"\\f078";font-family:"Font Awesome 6 Free";font-weight:900;margin-left:auto;transition:transform .2s}.nav-item.active.has-submenu:after{transform:rotate(180deg)}.submenu{list-style-type:none;padding-left:20px;max-height:0;overflow:hidden;transition:max-height .3s ease-in-out}.submenu.open{max-height:500px}.sidebar.collapsed{width:var(--sidebar-width-collapsed)}.sidebar.collapsed .brand span{display:none}.sidebar.collapsed .nav-item{justify-content:center}.sidebar.collapsed .nav-item span{display:none}.sidebar.collapsed .has-submenu:after{display:none}.sidebar.collapsed .submenu{display:none}.sidebar.collapsed .sidebar-toggle-btn i{transform:rotate(180deg);transition:transform .25s ease}.main{flex-grow:1;padding:24px;overflow-y:auto}.auth-modal{position:fixed;inset:0;background:#000000d9;display:none;align-items:center;justify-content:center;z-index:1000}.auth-box{width:360px;max-width:90vw;background:#0a0a0f;border:1px solid var(--purple);padding:24px;border-radius:12px}.auth-input{width:100%;padding:10px 12px;margin:8px 0;border:1px solid var(--border);border-radius:8px;background:#000;color:#fff}.btn{width:100%;padding:12px;border:none;border-radius:8px;font-weight:700;cursor:pointer}.btn-primary{background:var(--emerald);color:#000}.btn-outline{background:transparent;color:var(--text-muted);border:1px solid var(--border);margin-top:8px}