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ease}.submit-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 5px 15px #667eea66}.submit-btn:disabled{opacity:.7;cursor:not-allowed}.toggle-auth{text-align:center;margin-top:20px;font-size:14px;color:#666}.toggle-btn{background:none;border:none;color:#667eea;cursor:pointer;font-weight:600;text-decoration:underline;margin-left:5px;transition:color .3s ease}.toggle-btn:hover{color:#764ba2}.app{display:flex;flex-direction:column;min-height:100vh;background-color:#f5f5f5}.navbar{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:0;box-shadow:0 2px 8px #0000001a}.navbar-container{max-width:1200px;margin:0 auto;padding:15px 20px;display:flex;justify-content:space-between;align-items:center;width:100%}.navbar-brand h1{margin:0;font-size:24px;font-weight:700}.navbar-menu{display:flex;align-items:center;gap:20px}.user-info{font-size:14px}.login-prompt{color:#fff;text-decoration:none;font-size:14px;padding:8px 16px;border-radius:4px;transition:all .3s ease;cursor:pointer;display:inline-block;background-color:#fff3;border:1px solid rgba(255,255,255,.3)}.login-prompt:hover{background-color:#ffffff4d;border-color:#ffffff80}.logout-btn{padding:8px 16px;background-color:#fff3;color:#fff;border:1px solid rgba(255,255,255,.3);border-radius:4px;cursor:pointer;font-size:14px;transition:all .3s ease}.logout-btn:hover{background-color:#ffffff4d;border-color:#ffffff80}.nav-link{color:#fff;text-decoration:none;font-size:14px;padding:8px 12px;border-radius:4px;transition:all .3s ease}.nav-link:hover{background-color:#fff3}.cart-link{position:relative;display:flex;align-items:center;text-decoration:none;color:#fff;font-size:24px;cursor:pointer;transition:all .3s ease;padding:8px 12px;border-radius:4px}.cart-link:hover{background-color:#fff3}.cart-icon{display:inline-block}.cart-badge{position:absolute;top:-8px;right:-8px;background-color:#f44;color:#fff;border-radius:50%;width:20px;height:20px;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;border:2px solid #667eea}.main-content{flex:1;width:100%;box-sizing:border-box}.loading-container{display:flex;justify-content:center;align-items:center;min-height:100vh;background-color:#f5f5f5;font-size:18px;color:#666}