.app-header{background:#1a1a1a;color:#fff;padding:16px 24px;border-bottom:1px solid #333;position:relative;display:flex;justify-content:center;align-items:center;min-height:96px}.app-header h1{margin:0;font-size:2rem;font-weight:200;letter-spacing:-.02em;color:#fff;cursor:pointer;transition:opacity .2s}.app-header h1:hover{opacity:.8}.app-subtitle{margin:8px 0 0;font-size:1rem;font-weight:300;color:hsla(0,0%,100%,.7);letter-spacing:.02em;text-align:center}.app-title-container{display:flex;align-items:center;justify-content:center;gap:12px;flex-direction:row}.title-section{display:flex;flex-direction:column;align-items:center;gap:8px}@media (max-width:768px){.app-header{padding:12px 16px 16px;min-height:auto}.app-header h1{font-size:1.6rem;margin-bottom:4px}.app-subtitle{font-size:.85rem;margin-bottom:0}.app-title-container svg{width:28px!important;height:28px!important}}@media (max-width:480px){.app-header{padding:10px 12px 14px}.app-header h1{font-size:1.4rem}.app-subtitle{font-size:.8rem;line-height:1.2}.app-title-container{gap:8px}.app-title-container svg{width:24px!important;height:24px!important}}@media (max-width:360px){.app-header h1{font-size:1.2rem}.app-subtitle{font-size:.75rem;padding:0 8px}}@media (max-width:768px){.music-sidebar-container{display:none!important}.main-content-area{width:100%!important;flex:1!important}.app-main-container{flex-direction:column}.mobile-menu-toggle{display:flex!important;position:fixed;bottom:20px;right:20px;width:56px;height:56px;border-radius:50%;background:linear-gradient(135deg,#8b5cf6,#7c3aed);border:none;box-shadow:0 4px 12px rgba(139,92,246,.4);align-items:center;justify-content:center;cursor:pointer;z-index:1000;color:#fff;font-size:24px}.mobile-menu-overlay{right:0;background:rgba(0,0,0,.8);z-index:998;backdrop-filter:blur(4px)}.mobile-menu-overlay,.mobile-menu-panel{display:block;position:fixed;top:0;left:0;bottom:0}.mobile-menu-panel{width:85%;max-width:320px;background:linear-gradient(180deg,#1a1a1a,#141414);z-index:999;transform:translateX(0);transition:transform .3s ease;overflow-y:auto;box-shadow:2px 0 12px rgba(0,0,0,.5)}.mobile-menu-panel.closed{transform:translateX(-100%)}.mobile-menu-header{padding:20px;border-bottom:1px solid hsla(0,0%,100%,.1);display:flex;align-items:center;justify-content:space-between}.mobile-menu-title{color:#8b5cf6;font-size:18px;font-weight:600;display:flex;align-items:center;gap:8px}.mobile-menu-close{background:transparent;border:none;color:hsla(0,0%,100%,.7);font-size:24px;cursor:pointer;padding:4px}.mobile-menu-content{padding:20px}.mobile-menu-section{margin-bottom:24px}.mobile-menu-section h4{color:hsla(0,0%,100%,.6);font-size:12px;text-transform:uppercase;letter-spacing:1px;margin-bottom:12px}.mobile-menu-item{display:flex;align-items:center;gap:12px;padding:12px;background:hsla(0,0%,100%,.05);border:1px solid hsla(0,0%,100%,.1);border-radius:8px;color:#fff;text-decoration:none;cursor:pointer;width:100%;margin-bottom:8px;transition:all .2s}.mobile-menu-item:hover{background:rgba(139,92,246,.2);border-color:rgba(139,92,246,.4)}.mobile-menu-item.active{background:rgba(139,92,246,.3);border-color:rgba(139,92,246,.5);color:#a78bfa}}@media (min-width:769px){.mobile-menu-overlay,.mobile-menu-panel,.mobile-menu-toggle{display:none!important}}@media (max-width:480px){.mobile-menu-panel{width:90%}.mobile-menu-toggle{width:48px;height:48px;font-size:20px}}@media (max-width:360px){.mobile-menu-panel{width:95%}.mobile-menu-toggle{bottom:16px;right:16px;width:44px;height:44px;font-size:18px}}